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Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi
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ISSN (Print) 1301-4048 - ISSN (Online) 2147-835X
Published by Sakarya Üniversitesi Homepage  [6 journals]
  • Role of Ag and tannin modification on photocatalytic and antibacterial
           properties of ZnO nanoplates

    • Authors: Nuray Güy; Soner Çakar, Keziban Atacan
      Abstract: This study represents the removal of malachitegreen (MG) from aqueous solution using ZnO,Ag/ZnO, ZnO/tannin and Ag/ZnO/tannin. The products were synthesized by microwave-hydrothermal andborohydride reduction method and they were characterized by optical,structural, morphological, antibacterial and photocatalytic features.  Additionally, the antibacterial studies of theprepared products were examined against Escherichia coli (E. Coli), Staphylococcus aureus (S. aureus)and Candida by the well diffusion method. Among the products, Ag/ZnO exhibits the highest photocatalytic activity.The photodegradation efficiency of 98.68% was recorded for Ag/ZnO after 30 min.Moreover, improved antibacterial activity of Ag/ZnO/tannin against E. Coli, S. aureus and Candida is observed. And it was found that Ag/ZnO/tannin hadmore excellent antibacterial activity compared to others. It has been foundthat the prepared products can be used in potential applications such decomposeof dye pollutants and destruction of pathogen bacteria and fungi.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Role of Ag and tannin modification on photocatalytic and antibacterial
           properties of ZnO nanoplates

    • Authors: Nuray Güy; Soner Çakar, Keziban Atacan
      Abstract: This study represents the removal of malachitegreen (MG) from aqueous solution using ZnO,Ag/ZnO, ZnO/tannin and Ag/ZnO/tannin. The products were synthesized by microwave-hydrothermal andborohydride reduction method and they were characterized by optical,structural, morphological, antibacterial and photocatalytic features.  Additionally, the antibacterial studies of theprepared products were examined against Escherichia coli (E. Coli), Staphylococcus aureus (S. aureus)and Candida by the well diffusion method. Among the products, Ag/ZnO exhibits the highest photocatalytic activity.The photodegradation efficiency of 98.68% was recorded for Ag/ZnO after 30 min.Moreover, improved antibacterial activity of Ag/ZnO/tannin against E. Coli, S. aureus and Candida is observed. And it was found that Ag/ZnO/tannin hadmore excellent antibacterial activity compared to others. It has been foundthat the prepared products can be used in potential applications such decomposeof dye pollutants and destruction of pathogen bacteria and fungi.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Determination of the Effects of Mineral on Seed Yield by Different
           Statistic Methods in Bread Wheat (Triticum aestivum L.) under Drought
           Conditions

    • Authors: Murat OLGUN; Okan Sezer, Metin Turan, Zekiye Budak Başçiftçi, Nazife Gözde Ayter Arpacıoğlu, Murat Ardıç, Onur Koyuncu
      Abstract: Thepurpose of this study is to determine the effect of minerals (N, P, K, Ca, Mg, S, Fe, Mn, Zn and Cu) on yield components by different statisticalmethods and this will help to understand efficiency of them in breedingprograms. This study was carried out in the location of EskişehirOsmangazi University, Faculty of Agriculture, in 2014-15 arid cropping seasons.Success mainly depends on power of effectiveness parameters used andstatistical methods could be safely used to reveal effectiveness of parametersin the breeding programs. Results of correlation, cluster, principal componentand conditional formatting analyses revealed that with in the efficiency limits(between the lowest dose and toxicity level) integrative effects of mineralswere determined. This means that behavior of minerals among genotypes are mainlysimilar. some minerals called MEPG(N, P, K, Ca, S and Zn) are mostly effective in growth, others called MECA (Mg, Fe, Mn and Cu) are mostlyeffective in photosynthesis, and 0,767 unit increase MEGA and 0,481 unit in MECAincreases result in 1 unit increase in the grain yield. Harmankaya, Sultan,Müfitbey and Tosunbey were found as higher performance and stabile bread wheatgenotypes. To determine the changes of the minerals in the genotypes, areimportant for definig their effect on yield as well as the yield components.Obtained data will make contributions to the success of breeding programs thatwill be done in the future.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Determination of the Effects of Mineral on Seed Yield by Different
           Statistic Methods in Bread Wheat (Triticum aestivum L.) under Drought
           Conditions

    • Authors: Murat OLGUN; Okan Sezer, Metin Turan, Zekiye Budak Başçiftçi, Nazife Gözde Ayter Arpacıoğlu, Murat Ardıç, Onur Koyuncu
      Abstract: Thepurpose of this study is to determine the effect of minerals (N, P, K, Ca, Mg, S, Fe, Mn, Zn and Cu) on yield components by different statisticalmethods and this will help to understand efficiency of them in breedingprograms. This study was carried out in the location of EskişehirOsmangazi University, Faculty of Agriculture, in 2014-15 arid cropping seasons.Success mainly depends on power of effectiveness parameters used andstatistical methods could be safely used to reveal effectiveness of parametersin the breeding programs. Results of correlation, cluster, principal componentand conditional formatting analyses revealed that with in the efficiency limits(between the lowest dose and toxicity level) integrative effects of mineralswere determined. This means that behavior of minerals among genotypes are mainlysimilar. some minerals called MEPG(N, P, K, Ca, S and Zn) are mostly effective in growth, others called MECA (Mg, Fe, Mn and Cu) are mostlyeffective in photosynthesis, and 0,767 unit increase MEGA and 0,481 unit in MECAincreases result in 1 unit increase in the grain yield. Harmankaya, Sultan,Müfitbey and Tosunbey were found as higher performance and stabile bread wheatgenotypes. To determine the changes of the minerals in the genotypes, areimportant for definig their effect on yield as well as the yield components.Obtained data will make contributions to the success of breeding programs thatwill be done in the future.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Contributions to Culicoides Latreille, 1809 (Diptera: Ceratopogonidae)
           Fauna of Sinop Province

    • Authors: Fethi Turgut
      Abstract: In recent years, Sinop province has become an importanttouristic center of Black Sea Region in Turkey. Akliman is also one of the mostvisited touristic areas of Sinop. It is notable that aquatic and semi-aquatichabitats in Akliman and surrounding areas are suitable reproduction areas for Culicoides (Diptera: Ceratopogonidae).Females Culicoides biting midgesirritate people and animals because they feed on blood sucking. Thus, the studyaimed to determine the species of the genus in Akliman District of SinopProvince, which is little investigated. The present study was conducted in 2014and 2015. Samples were collected using CDC miniature light trap and blackfluorescent lamp light trap, which were kept inside bottles with 70% ethylalcohol. Culicoides specimens wereidentified using steromicroscope and light microscope. A total of 15 species ofthe Culicoides genus was identifiedin the study area. Culicoides alazanicusDzhafarov, 1961, C. cataneiiClastrier, 1957, C. gejgelensisDzhafarov, 1964, C. griseidorsum Kieffer, 1918, C. kibunensis Tokunaga, 1937, C. longipennis Khalaf, 1957, C. obsoletus (Meigen, 1818), C. picturatus Kremer and Deduit, 1961and C. subfasciipennis Kieffer, 1919species are new records for Sinop. Male individuals belonging to C. alazanicus and C. griseidorsum in Turkey have been identified for the first timein this study.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Contributions to Culicoides Latreille, 1809 (Diptera: Ceratopogonidae)
           Fauna of Sinop Province

    • Authors: Fethi Turgut
      Abstract: In recent years, Sinop province has become an importanttouristic center of Black Sea Region in Turkey. Akliman is also one of the mostvisited touristic areas of Sinop. It is notable that aquatic and semi-aquatichabitats in Akliman and surrounding areas are suitable reproduction areas for Culicoides (Diptera: Ceratopogonidae).Females Culicoides biting midgesirritate people and animals because they feed on blood sucking. Thus, the studyaimed to determine the species of the genus in Akliman District of SinopProvince, which is little investigated. The present study was conducted in 2014and 2015. Samples were collected using CDC miniature light trap and blackfluorescent lamp light trap, which were kept inside bottles with 70% ethylalcohol. Culicoides specimens wereidentified using steromicroscope and light microscope. A total of 15 species ofthe Culicoides genus was identifiedin the study area. Culicoides alazanicusDzhafarov, 1961, C. cataneiiClastrier, 1957, C. gejgelensisDzhafarov, 1964, C. griseidorsum Kieffer, 1918, C. kibunensis Tokunaga, 1937, C. longipennis Khalaf, 1957, C. obsoletus (Meigen, 1818), C. picturatus Kremer and Deduit, 1961and C. subfasciipennis Kieffer, 1919species are new records for Sinop. Male individuals belonging to C. alazanicus and C. griseidorsum in Turkey have been identified for the first timein this study.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Description of Maximally Dissipative Quasi-Differential Operators for
           First Order

    • Authors: PEMBE IPEK AL
      Abstract: In thiswork, the general form of maximally dissipative extensions of the minimaloperator generated by first order linear symmetric quasi-differentialexpression in the weighted Hilbert space of vector-functions at rightsemi-infinite interval has been found. Later on, geometry of spectrum of theseextensions is investigated.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Description of Maximally Dissipative Quasi-Differential Operators for
           First Order

    • Authors: PEMBE IPEK AL
      Abstract: In thiswork, the general form of maximally dissipative extensions of the minimaloperator generated by first order linear symmetric quasi-differentialexpression in the weighted Hilbert space of vector-functions at rightsemi-infinite interval has been found. Later on, geometry of spectrum of theseextensions is investigated.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Meyer-Neldel Rule in Ac Conductivity of Cu Doped ZnO Thin Films

    • Authors: Nursel Can; Birsel Can Ömür, Ahmet Altındal
      Abstract: Ac charge transport mechanisms have been comparatively investigated in ZnO thinfilms having different Cu dopant. A comparative study of the applicability of quantummechanical tunelling and correlated barrier hopping model to obtained ac electricalconductivity results has been performed.Comparing the temperature dependence of the frequency exponent shows that the correlatedbarrier hopping model best describesthe experimental data on the ac conductivity in ZnO:Cu thin films. In order togain an understanding of the applicability of Meyer-Neldel rule, the dependenceof the thermal activation energy on Cu doping concentration in these films hasalso been studied. The obtained experimental results indicated thatMeyer-Neldel rule can be succesfully applied ac conductivity data for highly Cudoped films but not others which has been explained on the basis ofdistribution variations in density of states.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Meyer-Neldel Rule in Ac Conductivity of Cu Doped ZnO Thin Films

    • Authors: Nursel Can; Birsel Can Ömür, Ahmet Altındal
      Abstract: Ac charge transport mechanisms have been comparatively investigated in ZnO thinfilms having different Cu dopant. A comparative study of the applicability of quantummechanical tunelling and correlated barrier hopping model to obtained ac electricalconductivity results has been performed.Comparing the temperature dependence of the frequency exponent shows that the correlatedbarrier hopping model best describesthe experimental data on the ac conductivity in ZnO:Cu thin films. In order togain an understanding of the applicability of Meyer-Neldel rule, the dependenceof the thermal activation energy on Cu doping concentration in these films hasalso been studied. The obtained experimental results indicated thatMeyer-Neldel rule can be succesfully applied ac conductivity data for highly Cudoped films but not others which has been explained on the basis ofdistribution variations in density of states.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Comparison of Leaf Beetle (Coleoptera: Chrysomelidae) Diversity of Turkey
           and Neighboring Countries with Respect to Species Numbers and Endemicity

    • Authors: Ali Nafiz Ekiz
      Abstract: According to number of leaf beetle species andsubspecies, Turkey is the most diverse country by far among its neighbors with916 reported taxa. The species numbers of neighboring countries are as follows:Bulgaria 603, Ukraine 582, Greece 507, Romania 495, Iran 479, Russia (only thesouthern European part included) 441, Azerbaijan 373, Armenia 294, Georgia 273,Syria 254, Cyprus (whole island) 136, Iraq 120 and Moldova 103. As to number ofendemic taxa, Iran and Turkey keep ahead with 103 and 88 endemics respectively.The closest country is Greece with 32 endemics and Moldova contains no endemictaxa. However, when we calculate the rate of endemism, Iran is unmatched withan endemism ratio of 21.50%, followed by Iraq and Turkey having 10.00% and9.61% endemism ratios respectively. When we consider all countries (exceptRussia, because it is partly included in the current study), there is aninsignificant weak correlation between the number of species and the surfacearea of selected countries. Normally, under similar biogeographic conditions, alarger area should include more species, but all countries here are nor similarin terms of biogeography. In fact, the known species numbers of a region arealso greatly affected by the quantity and quality of relevant researchconducted in that area. Here, the case of Iran (and perhaps some othercountries) is most likely associated with the low number of research on leafbeetles. When we exclude Iran, there is a moderate positive correlation betweenthe species numbers and surface area.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Comparison of Leaf Beetle (Coleoptera: Chrysomelidae) Diversity of Turkey
           and Neighboring Countries with Respect to Species Numbers and Endemicity

    • Authors: Ali Nafiz Ekiz
      Abstract: According to number of leaf beetle species andsubspecies, Turkey is the most diverse country by far among its neighbors with916 reported taxa. The species numbers of neighboring countries are as follows:Bulgaria 603, Ukraine 582, Greece 507, Romania 495, Iran 479, Russia (only thesouthern European part included) 441, Azerbaijan 373, Armenia 294, Georgia 273,Syria 254, Cyprus (whole island) 136, Iraq 120 and Moldova 103. As to number ofendemic taxa, Iran and Turkey keep ahead with 103 and 88 endemics respectively.The closest country is Greece with 32 endemics and Moldova contains no endemictaxa. However, when we calculate the rate of endemism, Iran is unmatched withan endemism ratio of 21.50%, followed by Iraq and Turkey having 10.00% and9.61% endemism ratios respectively. When we consider all countries (exceptRussia, because it is partly included in the current study), there is aninsignificant weak correlation between the number of species and the surfacearea of selected countries. Normally, under similar biogeographic conditions, alarger area should include more species, but all countries here are nor similarin terms of biogeography. In fact, the known species numbers of a region arealso greatly affected by the quantity and quality of relevant researchconducted in that area. Here, the case of Iran (and perhaps some othercountries) is most likely associated with the low number of research on leafbeetles. When we exclude Iran, there is a moderate positive correlation betweenthe species numbers and surface area.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Preparation and antibacterial activity of solvothermal synthesized
           ZnFe2O4/Ag-TiO2 nanocomposite

    • Authors: Keziban Atacan; Nuray Güy, Soner Çakar
      Abstract: In this study, ZnFe2O4magnetic nanoparticlesandZnFe2O4/Ag-TiO2nanocomposite were synthesized solvothermally. The preparedmaterials were characterized using X-ray diffraction, Scanning electronmicroscopy, Fourier transform infrared spectroscopy and Vibrating samplemagnetometer. In addition, the antibacterial performance of materials wasevaluated against Gram-positivebacteria (Staphyloccocus aureus) and Gram-negativebacteria (Escherichia coli). ZnFe2O4/Ag-TiO2 nanocomposite was shown strongerantibacterial efficiency against Gram-positive bacteria Staphyloccocus aureus than Escherichiacoli. Also, the inhibition diameter of 15±0.2 mm for ZnFe2O4/Ag-TiO2 nanocomposite wasmeasured since the antibacterial activity increased by nanocomposite formation.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Preparation and antibacterial activity of solvothermal synthesized
           ZnFe2O4/Ag-TiO2 nanocomposite

    • Authors: Keziban Atacan; Nuray Güy, Soner Çakar
      Abstract: In this study, ZnFe2O4magnetic nanoparticlesandZnFe2O4/Ag-TiO2nanocomposite were synthesized solvothermally. The preparedmaterials were characterized using X-ray diffraction, Scanning electronmicroscopy, Fourier transform infrared spectroscopy and Vibrating samplemagnetometer. In addition, the antibacterial performance of materials wasevaluated against Gram-positivebacteria (Staphyloccocus aureus) and Gram-negativebacteria (Escherichia coli). ZnFe2O4/Ag-TiO2 nanocomposite was shown strongerantibacterial efficiency against Gram-positive bacteria Staphyloccocus aureus than Escherichiacoli. Also, the inhibition diameter of 15±0.2 mm for ZnFe2O4/Ag-TiO2 nanocomposite wasmeasured since the antibacterial activity increased by nanocomposite formation.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On Total Shear Curvature of Surfaces in E^{n+2}

    • Authors: Kadri Arslan; Betül Bulca
      Abstract: In the present study we consider surfaces in Euclidean (n+2)-space Eⁿ⁺². Firstly, we introduce some basic concepts of second fundamental form and curvatures of the surfaces in Eⁿ⁺². Further, we obtained some basic properties of surfaces in Eⁿ⁺² and some results related with their total shear curvatures. Finally, we give an example of generalized spherical surfaces in Euclidean 4-space E⁴ with vanishing shear curvature.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On Total Shear Curvature of Surfaces in E^{n+2}

    • Authors: Kadri Arslan; Betül Bulca
      Abstract: In the present study we consider surfaces in Euclidean (n+2)-space Eⁿ⁺². Firstly, we introduce some basic concepts of second fundamental form and curvatures of the surfaces in Eⁿ⁺². Further, we obtained some basic properties of surfaces in Eⁿ⁺² and some results related with their total shear curvatures. Finally, we give an example of generalized spherical surfaces in Euclidean 4-space E⁴ with vanishing shear curvature.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Optical properties of the electron and gamma-ray irradiated soda-lime
           glass samples

    • Authors: Gülten Onay; Ramazan Şahin
      Abstract: Optical transmission and absorption spectra of Soda-lime glass samples were studied after irradiation by 8MeV electron and γ-ray beams. We used modified clinical LINAC for production of electron beam whereas60Co was used as a γ-ray source. Optical properties of glass samples were analyzed for different doses andradiation types. Irradiation induced color centers in the glass samples were observed in both cases.Moreover, time-dependent optical properties were also acquired after irradiation source was turned off andwe observed that these colour centers disappear slowly even at room temperature. Optical transmissionspectra of 8 MeV electron and γ-ray beam irradiated samples show spectacular absorption band in thevisible region. On the other hand, these absorption bands nearly recover themselves when the irradiatedsamples are baked for a short time above 100 ◦C.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Optical properties of the electron and gamma-ray irradiated soda-lime
           glass samples

    • Authors: Gülten Onay; Ramazan Şahin
      Abstract: Optical transmission and absorption spectra of Soda-lime glass samples were studied after irradiation by 8MeV electron and γ-ray beams. We used modified clinical LINAC for production of electron beam whereas60Co was used as a γ-ray source. Optical properties of glass samples were analyzed for different doses andradiation types. Irradiation induced color centers in the glass samples were observed in both cases.Moreover, time-dependent optical properties were also acquired after irradiation source was turned off andwe observed that these colour centers disappear slowly even at room temperature. Optical transmissionspectra of 8 MeV electron and γ-ray beam irradiated samples show spectacular absorption band in thevisible region. On the other hand, these absorption bands nearly recover themselves when the irradiatedsamples are baked for a short time above 100 ◦C.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Continuous Dependence For Benjamin-Bona-Mahony-Burger Equation

    • Authors: Zeynep Sümeyye Çelik; Şevket Gür
      Abstract: In this work, it is proved that the solutions ofBenjamin-Bona-Mahony-Burger equation depends continuously on the coefficients.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Continuous Dependence For Benjamin-Bona-Mahony-Burger Equation

    • Authors: Zeynep Sümeyye Çelik; Şevket Gür
      Abstract: In this work, it is proved that the solutions ofBenjamin-Bona-Mahony-Burger equation depends continuously on the coefficients.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Evaluation of Two Stage Modified Ridge Estimator and Its Performance

    • Authors: Selma Toker; Nimet ÖZBAY
      Abstract: Biasedestimation methods are more desirable than two stage least squares estimationfor simultaneous equations models suffering from the problem ofmulticollinearity. This problem is also handled by using some prior information.Taking account of this knowledge, we recommend two stage modified ridgeestimator. The new estimator can also be evaluated as an alternative to thepreviously proposed two stage ridge estimator. The widespread performancecriterion, mean square error, is  takeninto consideration to compare the two stage modified ridge, two stage ridge andtwo stage least squares estimators. A real life data analysis is investigatedto prove the theoretical results in practice. In addition, theintervals of the biasing parameter which provide the superiority of the twostage modified ridge estimator are determined  with the help of figures. Theresearchers who deal with simultaneous systems with multicollinearity can opt forthe two stage modified ridge estimator.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Evaluation of Two Stage Modified Ridge Estimator and Its Performance

    • Authors: Selma Toker; Nimet ÖZBAY
      Abstract: Biasedestimation methods are more desirable than two stage least squares estimationfor simultaneous equations models suffering from the problem ofmulticollinearity. This problem is also handled by using some prior information.Taking account of this knowledge, we recommend two stage modified ridgeestimator. The new estimator can also be evaluated as an alternative to thepreviously proposed two stage ridge estimator. The widespread performancecriterion, mean square error, is  takeninto consideration to compare the two stage modified ridge, two stage ridge andtwo stage least squares estimators. A real life data analysis is investigatedto prove the theoretical results in practice. In addition, theintervals of the biasing parameter which provide the superiority of the twostage modified ridge estimator are determined  with the help of figures. Theresearchers who deal with simultaneous systems with multicollinearity can opt forthe two stage modified ridge estimator.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Geometric Kinematic Approach to Rigid Objects with Point Contact Based on
           A Local-Surface Frame

    • Authors: Vahide Bulut
      Abstract: Controlling the relative motion between two contactingrigid bodies is necessary when manipulation and locomotion tasks areencountered in robotics. In this paper, we express the kinematics ofspin-rolling motion of rigid objects with point contact based on thelocal-surface frame method. We give the relationship between the Darboux frameand local-surface frame, and also between the Frenet-Serret frame and local-surfaceframe. Additionally, we obtain velocity of the moving object according to thelocal-surface frame curvatures of the respective contact curve and geometricinvariants. We can have proper information about trajectory planning if we takethe formulations of moving object into consideration according to thelocal-surface frame.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Geometric Kinematic Approach to Rigid Objects with Point Contact Based on
           A Local-Surface Frame

    • Authors: Vahide Bulut
      Abstract: Controlling the relative motion between two contactingrigid bodies is necessary when manipulation and locomotion tasks areencountered in robotics. In this paper, we express the kinematics ofspin-rolling motion of rigid objects with point contact based on thelocal-surface frame method. We give the relationship between the Darboux frameand local-surface frame, and also between the Frenet-Serret frame and local-surfaceframe. Additionally, we obtain velocity of the moving object according to thelocal-surface frame curvatures of the respective contact curve and geometricinvariants. We can have proper information about trajectory planning if we takethe formulations of moving object into consideration according to thelocal-surface frame.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A numerical technique based on Lucas polynomials together with standard
           and Chebyshev-Lobatto collocation points for solving functional
           integro-differential equations involving variable delays

    • Authors: Sevin Gümgüm; Nurcan Baykuş Savaşaneril, Ömür Kıvanç Kürkçü, Mehmet Sezer
      Abstract: In this paper, a new numerical matrix-collocation technique is consideredto solve functional integro-differential equations involving variable delaysunder the initial conditions. This technique is based essentially on Lucaspolynomials together with standard and Chebyshev-Lobatto collocation points.Some descriptive examples are performed to observe the practicability of thetechnique and the residual error analysis is employed to improve the obtainedsolutions. Also, the numerical results obtained by using these collocationpoints are compared in tables and figures.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A numerical technique based on Lucas polynomials together with standard
           and Chebyshev-Lobatto collocation points for solving functional
           integro-differential equations involving variable delays

    • Authors: Sevin Gümgüm; Nurcan Baykuş Savaşaneril, Ömür Kıvanç Kürkçü, Mehmet Sezer
      Abstract: In this paper, a new numerical matrix-collocation technique is consideredto solve functional integro-differential equations involving variable delaysunder the initial conditions. This technique is based essentially on Lucaspolynomials together with standard and Chebyshev-Lobatto collocation points.Some descriptive examples are performed to observe the practicability of thetechnique and the residual error analysis is employed to improve the obtainedsolutions. Also, the numerical results obtained by using these collocationpoints are compared in tables and figures.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Rings and Modules Whose Socles are Relative Ejective

    • Authors: Nuray Eroğlu
      Abstract: Lifting homomorphism from modulesto modules or even from certain submodule to the modules have been importantboth in ring and module theory. In this note we study rings and modules whosesocles are relative ejective. Moreover we reduce our consideration to rings andmodules with injective socles which provides the dual notion to PSmodules.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Rings and Modules Whose Socles are Relative Ejective

    • Authors: Nuray Eroğlu
      Abstract: Lifting homomorphism from modulesto modules or even from certain submodule to the modules have been importantboth in ring and module theory. In this note we study rings and modules whosesocles are relative ejective. Moreover we reduce our consideration to rings andmodules with injective socles which provides the dual notion to PSmodules.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Note On Convergence of Nonlinear General Type Two Dimensional Singular
           Integral Operators

    • Authors: MİNE MENEKŞE YILMAZ
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Note On Convergence of Nonlinear General Type Two Dimensional Singular
           Integral Operators

    • Authors: MİNE MENEKŞE YILMAZ
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • AW(k)-type Salkowski Curves in Euclidean 3-Space IE^3

    • Authors: İlim Kişi
      Abstract: We deal with AW(k)-type  Salkowski(anti-Salkowski) curves with constant   in the Euclidean3-space. We show that there is no AW(1)-type Salkowski curve and AW(1)-typeanti-Salkowski curve in . Also, we handle weak AW(2)-type and weak AW(3)-typeSalkowski (anti-Salkowski) curves. Also, we show that there is no weak AW(2)-typeSalkowski curve in .
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • AW(k)-type Salkowski Curves in Euclidean 3-Space IE^3

    • Authors: İlim Kişi
      Abstract: We deal with AW(k)-type  Salkowski(anti-Salkowski) curves with constant   in the Euclidean3-space. We show that there is no AW(1)-type Salkowski curve and AW(1)-typeanti-Salkowski curve in . Also, we handle weak AW(2)-type and weak AW(3)-typeSalkowski (anti-Salkowski) curves. Also, we show that there is no weak AW(2)-typeSalkowski curve in .
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • THE EXPLANATION OF METALLIC NATURE OF BBi(110) SURFACE

    • Authors: Sadık Bağcı
      Abstract: Bu çalışmada, düzlem dalgahesaplamaları ve yoğunluk fonksiyon teorisi kullanılarak zinc-blende faza sahipBBi kristalinin yapısal, elastik ve elektronik özellikleri incelenmiştir. Değiş-tokuşve karşılıklı etkileşme enerjileri ise yoğunluk fonksiyon teorisi ilehesaplamalara dahil edilmiştir. BBi için hesaplanan örgü sabiti ve hacim modülüdeğerleri daha önce bulunan teorik sonuçlarla iyi bir uyum içindedir. Elastiksabitler sabit hacimde tetragonal ve monoklinik gerilmeler kullanılarakhesaplanmıştır. BBi için elektronik bant yapısı ve durum yoğunluğuhesaplamaları da yapılmış ve detaylı bir şekilde tartışılmıştır. BBimateryalinin hacim özellikleri kullanılarak BBi'nin (110) yüzeyinin dengedurumu geometrisi ve elektronik bant yapısı da literatürde ilk defa eldeedilmiştir. Ayrıca toplam ve parçalı yüzey elektronik durum yoğunluğugrafikleri de elde edilerek BBi(110) yüzeyinin metalik yapısı anlatılmayaçalışılmıştır. Çalışmanın sonunda BBi(110) yüzey elektronik özellikleri diğermetalik yapıdaki AlBi, GaBi ve InBi materyallerinin (110) yüzeyleri ilekarşılaştırılmıştır.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • THE EXPLANATION OF METALLIC NATURE OF BBi(110) SURFACE

    • Authors: Sadık Bağcı
      Abstract: Bu çalışmada, düzlem dalgahesaplamaları ve yoğunluk fonksiyon teorisi kullanılarak zinc-blende faza sahipBBi kristalinin yapısal, elastik ve elektronik özellikleri incelenmiştir. Değiş-tokuşve karşılıklı etkileşme enerjileri ise yoğunluk fonksiyon teorisi ilehesaplamalara dahil edilmiştir. BBi için hesaplanan örgü sabiti ve hacim modülüdeğerleri daha önce bulunan teorik sonuçlarla iyi bir uyum içindedir. Elastiksabitler sabit hacimde tetragonal ve monoklinik gerilmeler kullanılarakhesaplanmıştır. BBi için elektronik bant yapısı ve durum yoğunluğuhesaplamaları da yapılmış ve detaylı bir şekilde tartışılmıştır. BBimateryalinin hacim özellikleri kullanılarak BBi'nin (110) yüzeyinin dengedurumu geometrisi ve elektronik bant yapısı da literatürde ilk defa eldeedilmiştir. Ayrıca toplam ve parçalı yüzey elektronik durum yoğunluğugrafikleri de elde edilerek BBi(110) yüzeyinin metalik yapısı anlatılmayaçalışılmıştır. Çalışmanın sonunda BBi(110) yüzey elektronik özellikleri diğermetalik yapıdaki AlBi, GaBi ve InBi materyallerinin (110) yüzeyleri ilekarşılaştırılmıştır.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Co-Mg ferrite nanocomposite as a humidity sensor device prepared by
           Co-Precipitation method

    • Authors: Tuğba Şaşmaz Kuru; Volkan Eyüpoğlu
      Abstract: In thepresent study, the humidity sensing properties of Co-Mg nanocomposite preparedby chemically co-precipitated have been investigated by impedance analysis. Thecorrelation between the impedance patterns and relative humidity have shownremarkable results for further investigation. Whereas, the humidity measurementcapability of the sensor was high at low frequencies. Also, we identified thatthis ability was continuously diminished at higher frequencies. So, thehysteresis value for successive adsorption and desorption of the humidity onferrite nanocomposite material was also determined as small and also the longtime measurement stability was excellent. The response and the recovery timesfor nanocomposite materials were identified as 60 s and 300 s respectively.Finally, a direct relationship between the active electron and transportmechanism of the humidity onto the nanocomposite has been identified as anadvanced investigation.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Co-Mg ferrite nanocomposite as a humidity sensor device prepared by
           Co-Precipitation method

    • Authors: Tuğba Şaşmaz Kuru; Volkan Eyüpoğlu
      Abstract: In thepresent study, the humidity sensing properties of Co-Mg nanocomposite preparedby chemically co-precipitated have been investigated by impedance analysis. Thecorrelation between the impedance patterns and relative humidity have shownremarkable results for further investigation. Whereas, the humidity measurementcapability of the sensor was high at low frequencies. Also, we identified thatthis ability was continuously diminished at higher frequencies. So, thehysteresis value for successive adsorption and desorption of the humidity onferrite nanocomposite material was also determined as small and also the longtime measurement stability was excellent. The response and the recovery timesfor nanocomposite materials were identified as 60 s and 300 s respectively.Finally, a direct relationship between the active electron and transportmechanism of the humidity onto the nanocomposite has been identified as anadvanced investigation.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Determining the Effect of Some Biasing Parameter Selection Methods for the
           Two Stage Ridge Regression Estimator

    • Authors: Nimet Özbay; Selma Toker
      Abstract:  The useof biased estimation techniques is inevitable in connection withmulticollinearity. Two stage ridge estimator is a pioneer biased estimatorwhich is use to recover the problems that are originated from themulticollinearity. The noteworthy issue regarding two stage ridge estimator isselection of its biasing parameter. This article investigates several methodson selection of the biasing parameter of the two stage ridge estimator based onthe works in the literature related to ridge estimator in a linear regressionmodel. To demonstrate the best estimators of the biasing parameter, a MonteCarlo experiment is conducted. The utility of the proposed estimators of thebiasing parameter for two stage ridge estimator is observed in terms of meansquare error criterion.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Determining the Effect of Some Biasing Parameter Selection Methods for the
           Two Stage Ridge Regression Estimator

    • Authors: Nimet Özbay; Selma Toker
      Abstract:  The useof biased estimation techniques is inevitable in connection withmulticollinearity. Two stage ridge estimator is a pioneer biased estimatorwhich is use to recover the problems that are originated from themulticollinearity. The noteworthy issue regarding two stage ridge estimator isselection of its biasing parameter. This article investigates several methodson selection of the biasing parameter of the two stage ridge estimator based onthe works in the literature related to ridge estimator in a linear regressionmodel. To demonstrate the best estimators of the biasing parameter, a MonteCarlo experiment is conducted. The utility of the proposed estimators of thebiasing parameter for two stage ridge estimator is observed in terms of meansquare error criterion.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Clinical Trial of The Evaluation of Environmental Exposure in Yttrium 90
           Radioembolization

    • Authors: Handan Tanyildizi; İffet Çavdar, Mustafa Demir
      Abstract: Aim: The aim of this study is to measure the dose rate of twodifferent forms of Y-90 microsphere used for radioembolization and to evaluatethe results according to radiation safety regularities. Material and Methods:19 patients were enrolled in study (Age:61±1.5, F/M:12/7). As a result of theevaluation of the physicians, 7 patients were treated with TheraSphere and 12patients were treated with SIR-Sphere. Dose rate measurements were taken at thestage of activity preparation, injection, radioactive wastes and discharge ofpatients via electronic dosimeter (ED). Results: The staff was exposed to doserate of 1,3.10-4 μSv/MBq.h during activity preparation stage,  2,4.10-4 μSv/MBq.h in injectionstage for Therapshere application. For SIR-spheres application, the staff wasexposed to dose rate of 24,5.10-4 μSv/MBq.h during activity preparationstage, 10,1.10-4 μSv/MBq.h in injection stage. The average amount ofdose received per operation was calculated 0.92±0.48 μSv in TheraSphere and3.22±0.89 μSv in SIR-Spheres. For discharge of the patients, the average doserate recorded from 1 m was found 4±0.28 μGy.h-1 for TheraSphere and3.2±0.15 μGy.h-1 for SIR-Spheres. The dose rate of radioactivewastes measured from the surface of the container which contained theradioactive wastes generated after the application was 0.5±0.1 μSv.h-1for TheraSphere and 1.1±0.08 μSv.h-1 for SIR-Spheres. Conclusion: Itis emphasized that Y-90 Therasphere application provides radiation safety morethan SIR-Spheres because of its closed system, even so both applications showslow dose rate around the patient and short-term storage of radioactive wastesafter application would be sufficient.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Clinical Trial of The Evaluation of Environmental Exposure in Yttrium 90
           Radioembolization

    • Authors: Handan Tanyildizi; İffet Çavdar, Mustafa Demir
      Abstract: Aim: The aim of this study is to measure the dose rate of twodifferent forms of Y-90 microsphere used for radioembolization and to evaluatethe results according to radiation safety regularities. Material and Methods:19 patients were enrolled in study (Age:61±1.5, F/M:12/7). As a result of theevaluation of the physicians, 7 patients were treated with TheraSphere and 12patients were treated with SIR-Sphere. Dose rate measurements were taken at thestage of activity preparation, injection, radioactive wastes and discharge ofpatients via electronic dosimeter (ED). Results: The staff was exposed to doserate of 1,3.10-4 μSv/MBq.h during activity preparation stage,  2,4.10-4 μSv/MBq.h in injectionstage for Therapshere application. For SIR-spheres application, the staff wasexposed to dose rate of 24,5.10-4 μSv/MBq.h during activity preparationstage, 10,1.10-4 μSv/MBq.h in injection stage. The average amount ofdose received per operation was calculated 0.92±0.48 μSv in TheraSphere and3.22±0.89 μSv in SIR-Spheres. For discharge of the patients, the average doserate recorded from 1 m was found 4±0.28 μGy.h-1 for TheraSphere and3.2±0.15 μGy.h-1 for SIR-Spheres. The dose rate of radioactivewastes measured from the surface of the container which contained theradioactive wastes generated after the application was 0.5±0.1 μSv.h-1for TheraSphere and 1.1±0.08 μSv.h-1 for SIR-Spheres. Conclusion: Itis emphasized that Y-90 Therasphere application provides radiation safety morethan SIR-Spheres because of its closed system, even so both applications showslow dose rate around the patient and short-term storage of radioactive wastesafter application would be sufficient.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Application of Monte Carlo Method for Gamma ray Attenuation Properties of
           Lead Zinc Borate Glasses

    • Authors: Urkiye AKAR TARIM; Orhan GÜRLER
      Abstract: Thiswork aims to introduce an useful computational model, based in Monte Carlosimulation, which can be used in practical application, and this paper presentsvalues determined using a Monte Carlo algorithm for linear attenuationcoefficient of lead zinc borate glasses with different percentages of PbO. Thesimulation results have been verified with predictions from the XCOM program inthe studied energy region from 1 keV to 2000 keV and experimental results.Thus, this verification indicated that this research method can be followed todetermine the interaction and attenuation of gamma rays with the severalenergies in different materials. Also, the values of mean free path and thehalf-value layer were calculated using the values of the linear attenuationcoefficient. The dependence of these radiation shielding parameters on theenergy of impinging gamma ray and the ratio of substances changes has beenexamined.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Application of Monte Carlo Method for Gamma ray Attenuation Properties of
           Lead Zinc Borate Glasses

    • Authors: Urkiye AKAR TARIM; Orhan GÜRLER
      Abstract: Thiswork aims to introduce an useful computational model, based in Monte Carlosimulation, which can be used in practical application, and this paper presentsvalues determined using a Monte Carlo algorithm for linear attenuationcoefficient of lead zinc borate glasses with different percentages of PbO. Thesimulation results have been verified with predictions from the XCOM program inthe studied energy region from 1 keV to 2000 keV and experimental results.Thus, this verification indicated that this research method can be followed todetermine the interaction and attenuation of gamma rays with the severalenergies in different materials. Also, the values of mean free path and thehalf-value layer were calculated using the values of the linear attenuationcoefficient. The dependence of these radiation shielding parameters on theenergy of impinging gamma ray and the ratio of substances changes has beenexamined.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Incorporation of Cadmium into Hexagonal Boron Nitride by Solid State
           Reaction

    • Authors: Erhan Budak
      Abstract: In this study, cadmium-hexagonal boron nitride (Cd-h-BN) were synthesized according to the O’Connor method with varying amounts ofcadmium(II) nitrate. The structural characterizations were performedwith FTIR, XRD, and SEM techniqueswhile the cadmium contents in Cd-h-BN were determined by AAS. XRD resultsshown that an increasein interlayer distance of h-BN, and nano-scale products were observed at 1050°C. The lattice constantswere calculated by Scherrer equation and results were very close to the original h-BN. Although different amounts ofCd(NO3)2·5H2O were added in the starting mixtures,the cadmium contents of Cd-h-BN samples showed no significant difference andfew amounts of cadmium was intercalated to h-BN. In addition, increasingcadmium amount caused to minor grain growth of h-BN samples. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Incorporation of Cadmium into Hexagonal Boron Nitride by Solid State
           Reaction

    • Authors: Erhan Budak
      Abstract: In this study, cadmium-hexagonal boron nitride (Cd-h-BN) were synthesized according to the O’Connor method with varying amounts ofcadmium(II) nitrate. The structural characterizations were performedwith FTIR, XRD, and SEM techniqueswhile the cadmium contents in Cd-h-BN were determined by AAS. XRD resultsshown that an increasein interlayer distance of h-BN, and nano-scale products were observed at 1050°C. The lattice constantswere calculated by Scherrer equation and results were very close to the original h-BN. Although different amounts ofCd(NO3)2·5H2O were added in the starting mixtures,the cadmium contents of Cd-h-BN samples showed no significant difference andfew amounts of cadmium was intercalated to h-BN. In addition, increasingcadmium amount caused to minor grain growth of h-BN samples. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • METHEYLENE BLUE ADSORPTION AND PREPARATION SILVER BOUND TO ACTİVATED
           CARBON WITH SOL-GEL METHOD

    • Authors: Esra Altıntığ; Ömer Faruk Soydan
      Abstract: Thisstudy examines the characterization and adsorption features of silver that wasadded to oxygen containing activated carbons using the sol-gel method. Thesurface area of the silver coated activated carbon (AC/Ag) Nano-composites,which were prepared using the sol-gel method, was measured with theBraunauer-Emmett-Teller surface area calculation method according to N2adsorption at 77 K. The microstructure and surface morphologies of the AC/AgNano-composite samples were examined with the use of Scanning ElectronMicroscope. Methylene Blue removal was performed with AC/Ag-1 with 658.488 m2/g,which had the highest surface area, and the Qmax value was calculated as 416.66 mg/g. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • METHEYLENE BLUE ADSORPTION AND PREPARATION SILVER BOUND TO ACTİVATED
           CARBON WITH SOL-GEL METHOD

    • Authors: Esra Altıntığ; Ömer Faruk Soydan
      Abstract: Thisstudy examines the characterization and adsorption features of silver that wasadded to oxygen containing activated carbons using the sol-gel method. Thesurface area of the silver coated activated carbon (AC/Ag) Nano-composites,which were prepared using the sol-gel method, was measured with theBraunauer-Emmett-Teller surface area calculation method according to N2adsorption at 77 K. The microstructure and surface morphologies of the AC/AgNano-composite samples were examined with the use of Scanning ElectronMicroscope. Methylene Blue removal was performed with AC/Ag-1 with 658.488 m2/g,which had the highest surface area, and the Qmax value was calculated as 416.66 mg/g. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Screening of Xylanase and Glucose Isomerase Producing Bacteria Isolated
           from Hot Springs in Turkey

    • Authors: Dilsat Nigar Colak; Kadriye INAN BEKTAS, Muslum TOKGOZ, Sabriye CANAKCI, Ali Osman BELDUZ
      Abstract: Theaim of this study was screening of xylanase and glucose isomerase producingthermophilic bacteria isolated from some hot springs located to Aegean Regionof Turkey. Total sixty eight thermophilic isolates (Anoxybacillus, Brevibacillus,Geobacillus, Aneurinibacillus, Thermus, Paenibacillus and Proteobacter) werecollected previously from these fields and identified based on 16S rDNA genesequences. The isolates were screened with plate assay for determining thexylanase and glucose isomerase production abilities seperately in order to findnew strains for industrial processes. After an incubation period of two daysfor xylanase and 5-6 days for glucose isomerase at 50-60 °C, positive strainswere determined. Enzyme producing strains were confirmed by spectrophotemetricmeasurements with crude enzyme extracts, birchwood xylan and glucose were usedas substrates. Most of the strains (59 strains) were positive for xylandegradation while only sixteen of the strains had showed glucose isomeraseactivity. Fourteen of the strains have showed both xylanase and glucoseisomerase activity. None of the Paenibacillus, Aneurinibacillus, and Proteobacter strains were glucose isomerasepositive, although the glucose isomerase activity of Geobacillus strains were notably high. Both xylanase and glucoseisomerase activities have observed at 50-60 °C which is suitable forbiotechnological applications.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Screening of Xylanase and Glucose Isomerase Producing Bacteria Isolated
           from Hot Springs in Turkey

    • Authors: Dilsat Nigar Colak; Kadriye INAN BEKTAS, Muslum TOKGOZ, Sabriye CANAKCI, Ali Osman BELDUZ
      Abstract: Theaim of this study was screening of xylanase and glucose isomerase producingthermophilic bacteria isolated from some hot springs located to Aegean Regionof Turkey. Total sixty eight thermophilic isolates (Anoxybacillus, Brevibacillus,Geobacillus, Aneurinibacillus, Thermus, Paenibacillus and Proteobacter) werecollected previously from these fields and identified based on 16S rDNA genesequences. The isolates were screened with plate assay for determining thexylanase and glucose isomerase production abilities seperately in order to findnew strains for industrial processes. After an incubation period of two daysfor xylanase and 5-6 days for glucose isomerase at 50-60 °C, positive strainswere determined. Enzyme producing strains were confirmed by spectrophotemetricmeasurements with crude enzyme extracts, birchwood xylan and glucose were usedas substrates. Most of the strains (59 strains) were positive for xylandegradation while only sixteen of the strains had showed glucose isomeraseactivity. Fourteen of the strains have showed both xylanase and glucoseisomerase activity. None of the Paenibacillus, Aneurinibacillus, and Proteobacter strains were glucose isomerasepositive, although the glucose isomerase activity of Geobacillus strains were notably high. Both xylanase and glucoseisomerase activities have observed at 50-60 °C which is suitable forbiotechnological applications.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Normal Stress Analysis In an Infinite Elastic Body With A Locally Curved
           Carbon Nanotube

    • Authors: Kadriye Şimşek Alan
      Abstract: Bu çalışmada,  yerel eğriliklikarbon nanotüp içeren tek yönlü lifli kompozit malzemelerde normal gerimedağılımına ait sonuçlar ikinci yaklaşıma kadar elde edildi ve elde edilensonuçlar analiz edildi. Problem çözümü için sınır formu pertürbasyon yöntemikullanıldı. Araştırmalar parçalı homojen cisim modeli çerçevesinde elastisiteteorisinin üç boyutlu geometrik nonlineer kesin denklemleri kullanılarakyapıldı. Kompozitteki karbon nanotüplerin yoğunluğu düşük kabul edildi vekarbon nanotüpler arasındaki etkileşim ihmal edildi. Normal gerilme dağılımıile ilgili çok sayıda sonuç bulundu ve parametrelerinin bu gerilme dağılımınaetkisi analiz edildi.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Normal Stress Analysis In an Infinite Elastic Body With A Locally Curved
           Carbon Nanotube

    • Authors: Kadriye Şimşek Alan
      Abstract: Bu çalışmada,  yerel eğriliklikarbon nanotüp içeren tek yönlü lifli kompozit malzemelerde normal gerimedağılımına ait sonuçlar ikinci yaklaşıma kadar elde edildi ve elde edilensonuçlar analiz edildi. Problem çözümü için sınır formu pertürbasyon yöntemikullanıldı. Araştırmalar parçalı homojen cisim modeli çerçevesinde elastisiteteorisinin üç boyutlu geometrik nonlineer kesin denklemleri kullanılarakyapıldı. Kompozitteki karbon nanotüplerin yoğunluğu düşük kabul edildi vekarbon nanotüpler arasındaki etkileşim ihmal edildi. Normal gerilme dağılımıile ilgili çok sayıda sonuç bulundu ve parametrelerinin bu gerilme dağılımınaetkisi analiz edildi.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Pseudo-mirror nuclei in the mass regions A~ 170 and A~ 200

    • Authors: BAHADIR SAYGI
      Abstract: The concept ofpseudo-mirror nuclei is based on NπNν scheme introducedas an extension of NpNnscheme. The NπNν schemetells us that if two nuclei from different mass region have equal number ofintegrated n-p interaction than the experimental observables E(2+), E(4+)/E(2+)and B(E2; 2+→ 0+) are expected to be almost equal,therefore equal number of n-p interaction build similar level schemes up tocertain spin quantum numbers. Pseudo-mirror nuclei have been introduced for thefirst time in the mass regions A ~ 100 and A ~ 130 for Mo, Zr, Nd and Cenuclei.  Later, a systematic work carriedout over a broad region of Segre chart showedthat not only the excitation energies but also related B(E2) values of excitedstates in Pseudo-mirror nuclei (PMN) are in good agreement. In the presentwork, we present new pseudo-mirror nuclei in the mass region A ~ 170 and A ~200 for the first time. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Pseudo-mirror nuclei in the mass regions A~ 170 and A~ 200

    • Authors: BAHADIR SAYGI
      Abstract: The concept ofpseudo-mirror nuclei is based on NπNν scheme introducedas an extension of NpNnscheme. The NπNν schemetells us that if two nuclei from different mass region have equal number ofintegrated n-p interaction than the experimental observables E(2+), E(4+)/E(2+)and B(E2; 2+→ 0+) are expected to be almost equal,therefore equal number of n-p interaction build similar level schemes up tocertain spin quantum numbers. Pseudo-mirror nuclei have been introduced for thefirst time in the mass regions A ~ 100 and A ~ 130 for Mo, Zr, Nd and Cenuclei.  Later, a systematic work carriedout over a broad region of Segre chart showedthat not only the excitation energies but also related B(E2) values of excitedstates in Pseudo-mirror nuclei (PMN) are in good agreement. In the presentwork, we present new pseudo-mirror nuclei in the mass region A ~ 170 and A ~200 for the first time. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Structural and Physical Properties of the PbS Films Obtained by Chemical
           Bath Deposition at Different Deposition Temperature

    • Authors: Ayça Kıyak Yıldırım; Barış Altıokka
      Abstract: In the present study, structural and physicalproperties of the PbS thin films produced using chemical bath deposition methodwere investigated.Deposition temperature was varied between 25 °C and 50 °C throughout the depositionperiod. The pH value of electrolyte solution and the deposition time of thefilms were 10.5 and 25 min, respectively. Characterizations of the PbS thin filmswere performed using scanning electron microscopy (SEM) and X-raydiffraction (XRD) methods. XRD results showedthat all PbS thin films had a cubic structure irrespective of depositiontemperature. Morphologicalcharacterizations of the films indicated that not only the number but also thesize of pinholes, formed on the film surfaces, were significantly affected bythe deposition temperature. Consequently,the film obtained at 25 ̊C exhibited a surface morphology with less and smallerpinholes, compared to others deposited at higher deposition temperatures.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Structural and Physical Properties of the PbS Films Obtained by Chemical
           Bath Deposition at Different Deposition Temperature

    • Authors: Ayça Kıyak Yıldırım; Barış Altıokka
      Abstract: In the present study, structural and physicalproperties of the PbS thin films produced using chemical bath deposition methodwere investigated.Deposition temperature was varied between 25 °C and 50 °C throughout the depositionperiod. The pH value of electrolyte solution and the deposition time of thefilms were 10.5 and 25 min, respectively. Characterizations of the PbS thin filmswere performed using scanning electron microscopy (SEM) and X-raydiffraction (XRD) methods. XRD results showedthat all PbS thin films had a cubic structure irrespective of depositiontemperature. Morphologicalcharacterizations of the films indicated that not only the number but also thesize of pinholes, formed on the film surfaces, were significantly affected bythe deposition temperature. Consequently,the film obtained at 25 ̊C exhibited a surface morphology with less and smallerpinholes, compared to others deposited at higher deposition temperatures.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Annealing Time Effect on the Optical Properties of Zn(O,OH,S) Films onto
           ZnO Seed Layer Under Un-vacuum Ambient

    • Authors: Fatma Özütok; Emin Yakar
      Abstract: Bu çalışmada, Zn (O,OH,S) filmleri ZnOgövde tabaka üzerine 500 °C’de tavlanarak sentezlenmiştir. Filmlerin yapısal özellikleri, yüzey morfolojileri vedetaylı optik özellikleri üzerindeki değişimler tavlama süresine bağlı olarakincelenmiştir.(30 dk. ile 90 dk. aralığında).30 ve 90 dk. tavlanan örneklerbozunmuş morfoloji sergilerken, 60 dk. tavlanmış örnekler farklı boyutlardanano-çiçek oluşumlar sergilemiştir. Tüm filmler ZnO-hekzagonal yapısıgöstermesine karşın, en belirgin ZnS-ile ilişkili pikler 90 dk. tavlanmışörneklerde görülmüştür. Uv-Vis spektrumu ile optik band sınırının 362 nm.yekaydığı tespit edilmiştir. ZnO, Zn(OH)2 titreşim pikleri çok keskinolmasına karşın, ZnS titreşim pikleri çok zayıftır. PL şiddetleri tavlamazamanı ile değişkenlik göstemiştir fakat tüm filmler için kusur-seviyeleri ileilişkili pikler benzerdir. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Annealing Time Effect on the Optical Properties of Zn(O,OH,S) Films onto
           ZnO Seed Layer Under Un-vacuum Ambient

    • Authors: Fatma Özütok; Emin Yakar
      Abstract: Bu çalışmada, Zn (O,OH,S) filmleri ZnOgövde tabaka üzerine 500 °C’de tavlanarak sentezlenmiştir. Filmlerin yapısal özellikleri, yüzey morfolojileri vedetaylı optik özellikleri üzerindeki değişimler tavlama süresine bağlı olarakincelenmiştir.(30 dk. ile 90 dk. aralığında).30 ve 90 dk. tavlanan örneklerbozunmuş morfoloji sergilerken, 60 dk. tavlanmış örnekler farklı boyutlardanano-çiçek oluşumlar sergilemiştir. Tüm filmler ZnO-hekzagonal yapısıgöstermesine karşın, en belirgin ZnS-ile ilişkili pikler 90 dk. tavlanmışörneklerde görülmüştür. Uv-Vis spektrumu ile optik band sınırının 362 nm.yekaydığı tespit edilmiştir. ZnO, Zn(OH)2 titreşim pikleri çok keskinolmasına karşın, ZnS titreşim pikleri çok zayıftır. PL şiddetleri tavlamazamanı ile değişkenlik göstemiştir fakat tüm filmler için kusur-seviyeleri ileilişkili pikler benzerdir. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Investigation of Magnetic Properties of Spin 5/2 Ising Chain by Using
           Transfer Matrix Method

    • Authors: Mehmet Gökhan Şensoy; Mehmet Batı
      Abstract: A magnetic property of the one dimensional spin 5/2Ising model under the magnetic field has been investigated by means of transfermatrix method. Thermodynamic response functions are also obtained for varyingvalues of scaling temperature and scaling magnetic field. Entropy and heatcapacity of the system were calculated by benefiting from the temperaturedependencies of Helmholtz free energy. Our simulation results demonstrate thatas the strength of the magnetic field is increased, heat capacity tend to shiftto the relatively higher temperature regions, and these findings are consistentwith previous results for the low spin values in one dimensional Ising systems.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Investigation of Magnetic Properties of Spin 5/2 Ising Chain by Using
           Transfer Matrix Method

    • Authors: Mehmet Gökhan Şensoy; Mehmet Batı
      Abstract: A magnetic property of the one dimensional spin 5/2Ising model under the magnetic field has been investigated by means of transfermatrix method. Thermodynamic response functions are also obtained for varyingvalues of scaling temperature and scaling magnetic field. Entropy and heatcapacity of the system were calculated by benefiting from the temperaturedependencies of Helmholtz free energy. Our simulation results demonstrate thatas the strength of the magnetic field is increased, heat capacity tend to shiftto the relatively higher temperature regions, and these findings are consistentwith previous results for the low spin values in one dimensional Ising systems.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some Remarks on Completeness and Compactness in G-Metric Spaces

    • Authors: Merve İlkhan; Emrah Evren Kara
      Abstract: Complete metric spaces havegreat importance in functional analysis and its applications. The purpose ofthis paper is to introduce and study on some types of completeness ingeneralized metric spaces by the aid of Bourbaki Cauchy and cofinallyBourbaki-Cauchy sequences which are belonging to the class bigger than theclass of Cauchy sequences. Moreover, by transporting some topological conceptsto generalized metric spaces, the relations between these concepts and thesenew types of completeness properties are given.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some Remarks on Completeness and Compactness in G-Metric Spaces

    • Authors: Merve İlkhan; Emrah Evren Kara
      Abstract: Complete metric spaces havegreat importance in functional analysis and its applications. The purpose ofthis paper is to introduce and study on some types of completeness ingeneralized metric spaces by the aid of Bourbaki Cauchy and cofinallyBourbaki-Cauchy sequences which are belonging to the class bigger than theclass of Cauchy sequences. Moreover, by transporting some topological conceptsto generalized metric spaces, the relations between these concepts and thesenew types of completeness properties are given.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On the Butterflies of Savur district (Mardin Province, Southeastern
           Turkey)

    • Authors: Erdem SEVEN; Cihan YILDIZ
      Abstract: In this study, collected butterfly species from Savurdistrict of Mardin in 2016 and 2017 were presented. A total of 35 species weregiven in the Papilionidae (2), Pieridae (11), Satyridae (8), Argynnidae (4),Lycaenidae (5) and Hesperiidae (5) families. Original reference, synonyms, andexamined materials were added for each species. All of the butterflies that arepresented are new to fauna of Savur district. However 6 species: Euchloeausonia (Hübner, [1804]),Pierisbrassicae (Linnaeus, 1758) (Pieridae),Melitaeaphoebe (Goeze, 1779) (Argynnidae), Plebejussephirus (Frivaldszky, 1835) (Lycaenidae), Carcharodus lavatherae (Esper, [1783]) and Eogenesalcides Herrich-Schäffer,[1852] (Hesperiidae) are the first record for Mardin Province.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On the Butterflies of Savur district (Mardin Province, Southeastern
           Turkey)

    • Authors: Erdem SEVEN; Cihan YILDIZ
      Abstract: In this study, collected butterfly species from Savurdistrict of Mardin in 2016 and 2017 were presented. A total of 35 species weregiven in the Papilionidae (2), Pieridae (11), Satyridae (8), Argynnidae (4),Lycaenidae (5) and Hesperiidae (5) families. Original reference, synonyms, andexamined materials were added for each species. All of the butterflies that arepresented are new to fauna of Savur district. However 6 species: Euchloeausonia (Hübner, [1804]),Pierisbrassicae (Linnaeus, 1758) (Pieridae),Melitaeaphoebe (Goeze, 1779) (Argynnidae), Plebejussephirus (Frivaldszky, 1835) (Lycaenidae), Carcharodus lavatherae (Esper, [1783]) and Eogenesalcides Herrich-Schäffer,[1852] (Hesperiidae) are the first record for Mardin Province.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Sequence Bounded Above by the Lucas Numbers

    • Authors: Ali Aydoğdu; Engin Özkan, Aykut Göçer
      Abstract: In this work, we consider the sequence whose nth term isthe number of h-vectors of length n. The set of integer vectors E(n) isintroduced. For, n >=2, the cardinality of E(n) is the nth Lucasnumber Ln isshowed. The relation between the set of h-vectors L(n) and theset of integer vectors E(n) is given.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Sequence Bounded Above by the Lucas Numbers

    • Authors: Ali Aydoğdu; Engin Özkan, Aykut Göçer
      Abstract: In this work, we consider the sequence whose nth term isthe number of h-vectors of length n. The set of integer vectors E(n) isintroduced. For, n >=2, the cardinality of E(n) is the nth Lucasnumber Ln isshowed. The relation between the set of h-vectors L(n) and theset of integer vectors E(n) is given.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Cloning, Expression and Characterization of Xylanase (xyn-akky1) from
           Bacillus subtilis in Escherichia coli

    • Authors: sema bilgin; Yakup ULUSU, Hülya KUDUĞ, İsa GÖKÇE
      Abstract: In thisstudy Bacillus subtilis akky1 strainwas isolated from the soil of beech forest in Akkuş City, Ordu Province,Turkey. The identification of the strain akky1 done by PCR amplification 16SrRNA. The full-length 16S rRNA sequence showed the highest nucleotidesimilarity (100%) with Bacillus subtilisstrain B7 (KC310823.1). Spesific oligonucleotides targeting the sequence of Bacillus subtilis xylanase gene given inGenBank were used to amplify a 642-bp fragment from genomic DNA. The geneencoding xylanase was cloned into pET28b (+) plasmid vector, sequenced andexpressed in Escherichia coli BL21(DE3). The hexahistidine (6xHis) tagged fusion protein was purified usingnickel affinity chromatography and the xylanase activity was measured. Themolecular mass of the purified xylanase was approximately 26 kDa as estimatedby SDS-PAGE. The xylanase had optimal activity at pH 6.0 and 60°C.The Km values of the recombinant enzyme towards beechwood was 3,33mg/ml.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Cloning, Expression and Characterization of Xylanase (xyn-akky1) from
           Bacillus subtilis in Escherichia coli

    • Authors: sema bilgin; Yakup ULUSU, Hülya KUDUĞ, İsa GÖKÇE
      Abstract: In thisstudy Bacillus subtilis akky1 strainwas isolated from the soil of beech forest in Akkuş City, Ordu Province,Turkey. The identification of the strain akky1 done by PCR amplification 16SrRNA. The full-length 16S rRNA sequence showed the highest nucleotidesimilarity (100%) with Bacillus subtilisstrain B7 (KC310823.1). Spesific oligonucleotides targeting the sequence of Bacillus subtilis xylanase gene given inGenBank were used to amplify a 642-bp fragment from genomic DNA. The geneencoding xylanase was cloned into pET28b (+) plasmid vector, sequenced andexpressed in Escherichia coli BL21(DE3). The hexahistidine (6xHis) tagged fusion protein was purified usingnickel affinity chromatography and the xylanase activity was measured. Themolecular mass of the purified xylanase was approximately 26 kDa as estimatedby SDS-PAGE. The xylanase had optimal activity at pH 6.0 and 60°C.The Km values of the recombinant enzyme towards beechwood was 3,33mg/ml.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Characterization of 3 fluoro-4-formylphenylboronic acid molecule with
           Density Functional Teory

    • Authors: EMİNE BABUR ŞAŞ; Mustafa Kurt
      Abstract: The geometric structure of3-fluoro-4-fomylphenylboronic acid (3-4FPBA) molecule were investigated withDFT/B3LYP/6-311++G(d,p) basis set. Specra of the title molecule were observedby FT-IR and FT-Raman spectra. Theoretical wavenumber were calculated also thesame metot and compared experimental wavenumber (FT-IR and FT-Raman) which werein a good agreement with observed ones. Furthermore, electronic structureproperties of in the title molecule such as HOMO-LUMO, Molecular ElectrostaticPotantial (MEP) and Mulliken charges were investigated by TD-DFT method.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Characterization of 3 fluoro-4-formylphenylboronic acid molecule with
           Density Functional Teory

    • Authors: EMİNE BABUR ŞAŞ; Mustafa Kurt
      Abstract: The geometric structure of3-fluoro-4-fomylphenylboronic acid (3-4FPBA) molecule were investigated withDFT/B3LYP/6-311++G(d,p) basis set. Specra of the title molecule were observedby FT-IR and FT-Raman spectra. Theoretical wavenumber were calculated also thesame metot and compared experimental wavenumber (FT-IR and FT-Raman) which werein a good agreement with observed ones. Furthermore, electronic structureproperties of in the title molecule such as HOMO-LUMO, Molecular ElectrostaticPotantial (MEP) and Mulliken charges were investigated by TD-DFT method.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some Characterizations Of Surfaces Generated by Two Curves In Heis3

    • Authors: gülden altay suroğlu
      Abstract: Inthis paper, some characterizations of surfaces which are constructed by using the group operation in  are given. Then, a newclassification for minimal factorable surfaces in  is obtained.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some Characterizations Of Surfaces Generated by Two Curves In Heis3

    • Authors: gülden altay suroğlu
      Abstract: Inthis paper, some characterizations of surfaces which are constructed by using the group operation in  are given. Then, a newclassification for minimal factorable surfaces in  is obtained.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On Inextensible Flows Developable Surfaces Associated Focal Curve
           According to Ribbon Frame

    • Authors: Mustafa yeneroğlu
      Abstract: In this paper, we investigate inextensible flows of focal curves in Euclidean 3-space associated to developable surfaces to ribbon frame. We present some new generalizations for torsion and curvature of focal curves in associated to developable surfaces. Finally, in case of having a flow of developable surface is inextensible we prove that this surface is not minimal. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • On Inextensible Flows Developable Surfaces Associated Focal Curve
           According to Ribbon Frame

    • Authors: Mustafa yeneroğlu
      Abstract: In this paper, we investigate inextensible flows of focal curves in Euclidean 3-space associated to developable surfaces to ribbon frame. We present some new generalizations for torsion and curvature of focal curves in associated to developable surfaces. Finally, in case of having a flow of developable surface is inextensible we prove that this surface is not minimal. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Biofilm Production and Antimicrobial Susceptibility Profiles of Bacillus
           spp. from Meats

    • Authors: Fatma Özdemir; Seza Arslan
      Abstract: The genus Bacillusis frequently found in soil, water and food. Bacillus cereus and Bacillusanthracis are the main pathogens causing foodborne diseases and seriousinfections in humans. A total of 52 Bacillusspp. from meat samples was tested for determination of biofilm production, antimicrobialresistance pattern and beta-lactamase activity. The 24 (46.1%) Bacillus isolates were found to be forbiofilm production. Of the 24 (46.1%) biofilm producer Bacillus isolates, 13 (25%), 6 (11.5%) and 5 (9.6%) were consideredas strong, moderate and weak biofilm producer, respectively. The most common speciesfor the production of biofilm was Bacillusthuringiensis (80%). Antimicrobial disk susceptibility tests of Bacillus spp. revealed high resistanceto ampicillin (84.6%) followed by penicillin (75%), cefepime (34.6%), andcefoxitin (26.9%). A multidrug resistance to at least 3 or more antimicrobialswas observed in the 25 isolates (48.1%). All Bacillus spp. were sensitive to vancomycin, gentamicin, amikacin, ciprofloxacin,and imipenem. The susceptibility rate to streptomycin, chloramphenicol, andtrimethoprim-sulphamethoxazole was 94.2%. Among the isolates, the 6 (11.5%) isolateswere found to be sensitive to all antimicrobial agents tested. Besides, onlyone isolate from meat was found to be positive for beta-lactamase test. Theexistence of biofilm production as a virulence factor and of multidrugresistance in bacteria isolated from food should not be underestimated in termsof food safety, public health and economic concerns.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Biofilm Production and Antimicrobial Susceptibility Profiles of Bacillus
           spp. from Meats

    • Authors: Fatma Özdemir; Seza Arslan
      Abstract: The genus Bacillusis frequently found in soil, water and food. Bacillus cereus and Bacillusanthracis are the main pathogens causing foodborne diseases and seriousinfections in humans. A total of 52 Bacillusspp. from meat samples was tested for determination of biofilm production, antimicrobialresistance pattern and beta-lactamase activity. The 24 (46.1%) Bacillus isolates were found to be forbiofilm production. Of the 24 (46.1%) biofilm producer Bacillus isolates, 13 (25%), 6 (11.5%) and 5 (9.6%) were consideredas strong, moderate and weak biofilm producer, respectively. The most common speciesfor the production of biofilm was Bacillusthuringiensis (80%). Antimicrobial disk susceptibility tests of Bacillus spp. revealed high resistanceto ampicillin (84.6%) followed by penicillin (75%), cefepime (34.6%), andcefoxitin (26.9%). A multidrug resistance to at least 3 or more antimicrobialswas observed in the 25 isolates (48.1%). All Bacillus spp. were sensitive to vancomycin, gentamicin, amikacin, ciprofloxacin,and imipenem. The susceptibility rate to streptomycin, chloramphenicol, andtrimethoprim-sulphamethoxazole was 94.2%. Among the isolates, the 6 (11.5%) isolateswere found to be sensitive to all antimicrobial agents tested. Besides, onlyone isolate from meat was found to be positive for beta-lactamase test. Theexistence of biofilm production as a virulence factor and of multidrugresistance in bacteria isolated from food should not be underestimated in termsof food safety, public health and economic concerns.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Extending property on EC-Fully Submodules

    • Authors: Ramazan YAŞAR; Adnan TERCAN
      Abstract: Thereare several generalizations of -modulesin literature. One of the generalization is based on fully invariantsubmodules. Recall that amodule  is called -extendingif every fully invariant submodule is essential in a direct summand. We call a module-extendingif every fully invariant submodule which contains essentially a cyclicsubmodule is essential in a direct summand. Initially we obtain basicproperties in the general module setting. For example, a direct sum of -extendingmodules is -extending.Again, like the -extendingproperty, the -extendingproperty is shown to carry over to matrix rings.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Extending property on EC-Fully Submodules

    • Authors: Ramazan YAŞAR; Adnan TERCAN
      Abstract: Thereare several generalizations of -modulesin literature. One of the generalization is based on fully invariantsubmodules. Recall that amodule  is called -extendingif every fully invariant submodule is essential in a direct summand. We call a module-extendingif every fully invariant submodule which contains essentially a cyclicsubmodule is essential in a direct summand. Initially we obtain basicproperties in the general module setting. For example, a direct sum of -extendingmodules is -extending.Again, like the -extendingproperty, the -extendingproperty is shown to carry over to matrix rings.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Summability factors between the absolute Cesàro methods

    • Authors: G. Canan Hazar Güleç
      Abstract: If Σε_{n}x_{n} is summable by the method Y whenever Σx_{n} is summable by the method X, then we say that the factor ε=(ε_{n}) is of type (X,Y) and denote by (X,Y). In this study we characterize the sets ( C,α _{k}, C,-1 ) , k>1 and ( C,-1 , C,α _{k}) , k≥1 for α>-1. Also, in the special case, we give some inclusion relations between methods, which completes some open problems in literature.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Summability factors between the absolute Cesàro methods

    • Authors: G. Canan Hazar Güleç
      Abstract: If Σε_{n}x_{n} is summable by the method Y whenever Σx_{n} is summable by the method X, then we say that the factor ε=(ε_{n}) is of type (X,Y) and denote by (X,Y). In this study we characterize the sets ( C,α _{k}, C,-1 ) , k>1 and ( C,-1 , C,α _{k}) , k≥1 for α>-1. Also, in the special case, we give some inclusion relations between methods, which completes some open problems in literature.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • KOROVKIN THEOREM VIA STATISTICAL e-MODULAR CONVERGENCE OF DOUBLE SEQUENCES

    • Authors: Sevda Yıldız
      Abstract: In the present paper, we obtain an abstract version of the Korovkin type theorem via the concept of statistical e-convergence in modular spaces for double sequences of positive linear operators. We give an application showing that the new result is stronger than classical ones. Also, we study an extension to non-positive operators.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • KOROVKIN THEOREM VIA STATISTICAL e-MODULAR CONVERGENCE OF DOUBLE SEQUENCES

    • Authors: Sevda Yıldız
      Abstract: In the present paper, we obtain an abstract version of the Korovkin type theorem via the concept of statistical e-convergence in modular spaces for double sequences of positive linear operators. We give an application showing that the new result is stronger than classical ones. Also, we study an extension to non-positive operators.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some New Equalities On The Intuitionistic Fuzzy Modal Operators

    • Authors: Mehmet Çitil; Feride Tuğrul
      Abstract: In thisstudy, properties of the two modal operator  defined on intuitionistic fuzzy sets wereinvestigated. Afterwards, some intuitionistic fuzzy operations were researched with modal operators. New equalities were obtained and proved. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Some New Equalities On The Intuitionistic Fuzzy Modal Operators

    • Authors: Mehmet Çitil; Feride Tuğrul
      Abstract: In thisstudy, properties of the two modal operator  defined on intuitionistic fuzzy sets wereinvestigated. Afterwards, some intuitionistic fuzzy operations were researched with modal operators. New equalities were obtained and proved. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • The First Indoor Radon Gas Measurement at Historical Places in Cappadocia,
           Nigde, Turkey

    • Authors: vakkas bozkurt; sefa ertürk
      Abstract: The aim of this study is todetermine the concentration of Radon and its annual effective dose at the NigdeMuseum and in a number of historical places namely the Sungur Bey, theAlaeddin, the Disari mosque and the Ak Medrese Culture House in Cappadocia,Nigde, Turkey by using a nuclear track detector CR-39 to ascertain how muchRadon concentration affects the people who are working in or visiting suchplaces. Nuclear track detectors CR-39 were used for measurement for 132 days atthe Nigde Museum, and for 63 days in the historical places. The exposed nucleartrack detectors were then sent to the Sarayköy Nuclear Research and TrainingCenter (SANAEM) to determine of Radon-222. The average Radon concentrationresults obtained for the Nigde Museum, the Sungur Bey, the Alaeddin, the Disarimosques and the Ak Medrese Culture House were 13.0±2.94 Bq/m3,31.67±3.86 Bq/m3, 52.0±5.72 Bq/m3, 42.67±19.34 Bq/m3and 31.0±4.55 Bq/m3 respectively. The average effective dose ofRadon was calculated for the Nigde Museum, the Sungur Bey, the Alaeddin, theDisari mosques and the Ak Medrese Culture House in Nigde and was found to beapproximately 0.137 mSv/y, 0.062 mSv/y, 0.103 mSv/y, 0.084 mSv/y and 0.327mSv/y respectively
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • The First Indoor Radon Gas Measurement at Historical Places in Cappadocia,
           Nigde, Turkey

    • Authors: vakkas bozkurt; sefa ertürk
      Abstract: The aim of this study is todetermine the concentration of Radon and its annual effective dose at the NigdeMuseum and in a number of historical places namely the Sungur Bey, theAlaeddin, the Disari mosque and the Ak Medrese Culture House in Cappadocia,Nigde, Turkey by using a nuclear track detector CR-39 to ascertain how muchRadon concentration affects the people who are working in or visiting suchplaces. Nuclear track detectors CR-39 were used for measurement for 132 days atthe Nigde Museum, and for 63 days in the historical places. The exposed nucleartrack detectors were then sent to the Sarayköy Nuclear Research and TrainingCenter (SANAEM) to determine of Radon-222. The average Radon concentrationresults obtained for the Nigde Museum, the Sungur Bey, the Alaeddin, the Disarimosques and the Ak Medrese Culture House were 13.0±2.94 Bq/m3,31.67±3.86 Bq/m3, 52.0±5.72 Bq/m3, 42.67±19.34 Bq/m3and 31.0±4.55 Bq/m3 respectively. The average effective dose ofRadon was calculated for the Nigde Museum, the Sungur Bey, the Alaeddin, theDisari mosques and the Ak Medrese Culture House in Nigde and was found to beapproximately 0.137 mSv/y, 0.062 mSv/y, 0.103 mSv/y, 0.084 mSv/y and 0.327mSv/y respectively
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Lyapunov Function For Logistic Equation On Time Scales

    • Authors: Veysel Fuat Hatipoğlu
      Abstract: In this study we focus on the stability of dynamic logistic equation which is used in single species population dynamics. Here we have introduced a quadratic Lyapunov function for generalized dynamic logistic equation on time scales. By using proposed Lyapunov function, asymptotic stability conditions for the equilibrium solution of dynamic logistic equation have been investigated. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A Lyapunov Function For Logistic Equation On Time Scales

    • Authors: Veysel Fuat Hatipoğlu
      Abstract: In this study we focus on the stability of dynamic logistic equation which is used in single species population dynamics. Here we have introduced a quadratic Lyapunov function for generalized dynamic logistic equation on time scales. By using proposed Lyapunov function, asymptotic stability conditions for the equilibrium solution of dynamic logistic equation have been investigated. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Fe/ZnO nanorod photoanode and pyrocatechol violet sensitizer based dye
           sensitized solar cells

    • Authors: Soner Cakar
      Abstract: A ZnO and Fe/ZnO nanorodshave been prepared and used in dye sensitized solar cells. The prepared ZnO andFe/ZnO nanorods were characterized by XRD, SEM and SEM-EDS. Additionally, thepyrocatechol violet solutions with different pH values have been prepared,characterized and used in dye sensitized solar cells. The dyes which have differentpH values were characterized via UV-Vis absorbance and cyclic voltammetrytechniques. The Fe doping to ZnO nanorods increased the solar cell efficiencyby 20-35%. The pyrocatechol violet dye can be binded to Fe atoms on the ZnOsurface and the possible mechanism was discussed in detailed. The efficiency ofchampion solar cell is obtained 1.39% with Fe/ZnO photoanode and pH 7.5pyrocatechol violet dye solution.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Fe/ZnO nanorod photoanode and pyrocatechol violet sensitizer based dye
           sensitized solar cells

    • Authors: Soner Cakar
      Abstract: A ZnO and Fe/ZnO nanorodshave been prepared and used in dye sensitized solar cells. The prepared ZnO andFe/ZnO nanorods were characterized by XRD, SEM and SEM-EDS. Additionally, thepyrocatechol violet solutions with different pH values have been prepared,characterized and used in dye sensitized solar cells. The dyes which have differentpH values were characterized via UV-Vis absorbance and cyclic voltammetrytechniques. The Fe doping to ZnO nanorods increased the solar cell efficiencyby 20-35%. The pyrocatechol violet dye can be binded to Fe atoms on the ZnOsurface and the possible mechanism was discussed in detailed. The efficiency ofchampion solar cell is obtained 1.39% with Fe/ZnO photoanode and pH 7.5pyrocatechol violet dye solution.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Catalytic Oxidation of 2-Mercaptoethanol by Cobalt(II)phthalocyanines
           Bearing Chalcone with Furan and Thiophene

    • Authors: Hüseyin Karaca
      Abstract: Cobalt(II) phthalocyanines carrying on the four of the peripheral positionsfuran and thiophene as chalcones were sythesized. THF is used to investigate the catalyticoxidation of 2-mercaptoethanol. Thesynthesized phthalocyanines show catalytic activity on the oxidation of2-mercaptoethanol. Cobalt (II) phthalocyanine derived by chalcone with furanhas given catalytic specifications such as turnover number TON as 16.6, initialreaction rate as 0.293 μmol/secand the oxygen consumption as 10.06 μmol/min.The other cobalt (II) phthalocyanine derived by chalcone with thiophene hasgiven catalytic specifications such as turnover number TON as 15.9, initialreaction rate as 0.213 μmol/sec andthe oxygen consumption as 9.88 μmol/min. So chalcone derived phthalocyanines can be used as catalyst is oxidationof mercaptan by air.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Catalytic Oxidation of 2-Mercaptoethanol by Cobalt(II)phthalocyanines
           Bearing Chalcone with Furan and Thiophene

    • Authors: Hüseyin Karaca
      Abstract: Cobalt(II) phthalocyanines carrying on the four of the peripheral positionsfuran and thiophene as chalcones were sythesized. THF is used to investigate the catalyticoxidation of 2-mercaptoethanol. Thesynthesized phthalocyanines show catalytic activity on the oxidation of2-mercaptoethanol. Cobalt (II) phthalocyanine derived by chalcone with furanhas given catalytic specifications such as turnover number TON as 16.6, initialreaction rate as 0.293 μmol/secand the oxygen consumption as 10.06 μmol/min.The other cobalt (II) phthalocyanine derived by chalcone with thiophene hasgiven catalytic specifications such as turnover number TON as 15.9, initialreaction rate as 0.213 μmol/sec andthe oxygen consumption as 9.88 μmol/min. So chalcone derived phthalocyanines can be used as catalyst is oxidationof mercaptan by air.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Channel Length Modulation in a Polystyrene Insulated Organic Field Effect
           Transistor Using PEDOT: PSS Composite Electrode

    • Authors: Ahmet Demir
      Abstract: The Organic Field EffectTransistor (OFET) with channel length modulation was fabricated by spin coatingmethod using a Poly(3-hexylthiophene) (P3HT) and the Polystyrene (PS) insulatoron a prepatterned as source-drain Indium thin oxide (ITO) substrate. Thepoly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was usedas  gate electrode. So, the structure ofOFET device is obtained as ITO/P3HT/PS/PEDOT:PSS. The ITO/PS/PEDOT:PSSstructure was prepared using same method for capacitance measurements of apolymer insulator. Electrical characterization of OFET devices were held intotal darkness and in air ambient for the purpose of achieving output andtransfer current-voltage (I-V)characteristics. The main parameters such as the threshold voltage (VTh), field effect mobility (mFET)and current on/off ratio (Ion/off)of the OFET devices were extracted from capacitance-frequency (C-f) plot of the ITO/PS/PEDOT:PSSstructure.  It was found that fabricatedPS-OFETs exhibit good device performance such as low VTh, remarkable mobility, and  Ion/offvalues.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Channel Length Modulation in a Polystyrene Insulated Organic Field Effect
           Transistor Using PEDOT: PSS Composite Electrode

    • Authors: Ahmet Demir
      Abstract: The Organic Field EffectTransistor (OFET) with channel length modulation was fabricated by spin coatingmethod using a Poly(3-hexylthiophene) (P3HT) and the Polystyrene (PS) insulatoron a prepatterned as source-drain Indium thin oxide (ITO) substrate. Thepoly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was usedas  gate electrode. So, the structure ofOFET device is obtained as ITO/P3HT/PS/PEDOT:PSS. The ITO/PS/PEDOT:PSSstructure was prepared using same method for capacitance measurements of apolymer insulator. Electrical characterization of OFET devices were held intotal darkness and in air ambient for the purpose of achieving output andtransfer current-voltage (I-V)characteristics. The main parameters such as the threshold voltage (VTh), field effect mobility (mFET)and current on/off ratio (Ion/off)of the OFET devices were extracted from capacitance-frequency (C-f) plot of the ITO/PS/PEDOT:PSSstructure.  It was found that fabricatedPS-OFETs exhibit good device performance such as low VTh, remarkable mobility, and  Ion/offvalues.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Extraction of propionic acid by emulsion liquid membrane using
           trioctylamine in toluene

    • Authors: Aynur Manzak
      Abstract: The extraction of carboxylic acids by emulsion liquid membranes has also attracted attention inbiotechnology, due to the high selectivity for the desired product, high separation rate and lower costly.The emulsion type liquid membrane system consists of three phases (water/organic/water) in which theorganic phase acts as a membrane between the aqueous internal phase and the aqueous external phase. Themain parameters such as surfactant concentration, mixing speed, feed phase pH, carrier concentration, andfeed phase concentration were investigated. In the optimum conditions, extraction efficiency was obtained71% in 10 minutes using trioctylamine (5% w/w) as a carrier, Span 80 (4% w/w) as a surfactant, toluene(91% w/w) as a diluent, sodium carbonate (10% w/w) as a stripping solution, mixing speed 300 rpm andfeed phase pH 2,5.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Extraction of propionic acid by emulsion liquid membrane using
           trioctylamine in toluene

    • Authors: Aynur Manzak
      Abstract: The extraction of carboxylic acids by emulsion liquid membranes has also attracted attention inbiotechnology, due to the high selectivity for the desired product, high separation rate and lower costly.The emulsion type liquid membrane system consists of three phases (water/organic/water) in which theorganic phase acts as a membrane between the aqueous internal phase and the aqueous external phase. Themain parameters such as surfactant concentration, mixing speed, feed phase pH, carrier concentration, andfeed phase concentration were investigated. In the optimum conditions, extraction efficiency was obtained71% in 10 minutes using trioctylamine (5% w/w) as a carrier, Span 80 (4% w/w) as a surfactant, toluene(91% w/w) as a diluent, sodium carbonate (10% w/w) as a stripping solution, mixing speed 300 rpm andfeed phase pH 2,5.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Timelike Factorable Surfaces in Minkowski Space-Time

    • Authors: Sezgin Büyükkütük
      Abstract: In this study, we discuss timelike factorable surfaces inMinkowski 4-space E_1^4. We calculate Gaussian and mean curvatures of thesesurfaces and classify timelike flat and minimal factorable surfaces inMinkowski space-time.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Timelike Factorable Surfaces in Minkowski Space-Time

    • Authors: Sezgin Büyükkütük
      Abstract: In this study, we discuss timelike factorable surfaces inMinkowski 4-space E_1^4. We calculate Gaussian and mean curvatures of thesesurfaces and classify timelike flat and minimal factorable surfaces inMinkowski space-time.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • 3x3 Dimensional Special Matrices Associated with Fibonacci and Lucas
           Numbers

    • Authors: Halim Özdemir; Tuğba Petik, Sinan Karakaya
      Abstract: In the study, it has been developed a method for deriving special matrices of 3x3 dimensions, whose powers are related to Fibonacci and Lucas numbers, and some special matrices have been found via the method developed. Also, it has been given some identities related to the matrices found.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • 3x3 Dimensional Special Matrices Associated with Fibonacci and Lucas
           Numbers

    • Authors: Halim Özdemir; Tuğba Petik, Sinan Karakaya
      Abstract: In the study, it has been developed a method for deriving special matrices of 3x3 dimensions, whose powers are related to Fibonacci and Lucas numbers, and some special matrices have been found via the method developed. Also, it has been given some identities related to the matrices found.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Cytogenetic Analysis of Tegenaria elysii (Araneae: Agelenidae)

    • Authors: Ümit KUMBIÇAK
      Abstract: Thereare 55 species of agelenid spiders in our country and the genus Tegenaria represents the widest group interms of species number. Inthis study, it was aimed to investigate the cytogenetic properties of Tegenaria elysii species. Chromosomeswere obtained by making some modifications to the method of Pekár and Král(2001). Hypotonic, fixation and staining steps were applied to the gonadsrespectively. Asa result, the number of diploid chromosomes and the sex chromosome system werefound as 2n=42, ♂X1X20/♀X1X1X2X2.Total relative lengths of chromosomes decreased gradually from 6,83%to 3,31%. Sexchromosomes which positive heteropycnotics in the stage of meiosis I have beendetected to be isopycnic in the stage of meiosis II. 20 autosomal bivalent andtwo sex chromosomes were identified in which diplotene and diakinesis stages.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Cytogenetic Analysis of Tegenaria elysii (Araneae: Agelenidae)

    • Authors: Ümit KUMBIÇAK
      Abstract: Thereare 55 species of agelenid spiders in our country and the genus Tegenaria represents the widest group interms of species number. Inthis study, it was aimed to investigate the cytogenetic properties of Tegenaria elysii species. Chromosomeswere obtained by making some modifications to the method of Pekár and Král(2001). Hypotonic, fixation and staining steps were applied to the gonadsrespectively. Asa result, the number of diploid chromosomes and the sex chromosome system werefound as 2n=42, ♂X1X20/♀X1X1X2X2.Total relative lengths of chromosomes decreased gradually from 6,83%to 3,31%. Sexchromosomes which positive heteropycnotics in the stage of meiosis I have beendetected to be isopycnic in the stage of meiosis II. 20 autosomal bivalent andtwo sex chromosomes were identified in which diplotene and diakinesis stages.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Curves According to the Successor Frame in Euclidean 3-Space

    • Authors: Melek Masal
      Abstract: In thepresent study, the successor formulae of the successor curves defined byMenninger [1] are given. Then, by defining the successor planes, the geometricmeanings of the successor curvatures are investigated and the relations acrossthe components of the position vectors of successor curves are found.Furthermore, in this study, it is proven that lies in the 3rd.type successorplane,  lies in the 1st type successorplane and by defining the involute-evolute S-pair, the distance between thecorresponding points of these curves is found.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Curves According to the Successor Frame in Euclidean 3-Space

    • Authors: Melek Masal
      Abstract: In thepresent study, the successor formulae of the successor curves defined byMenninger [1] are given. Then, by defining the successor planes, the geometricmeanings of the successor curvatures are investigated and the relations acrossthe components of the position vectors of successor curves are found.Furthermore, in this study, it is proven that lies in the 3rd.type successorplane,  lies in the 1st type successorplane and by defining the involute-evolute S-pair, the distance between thecorresponding points of these curves is found.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • THE EFFECT OF THE ROTATION ENERGİES OF H2+ MOLECULE ON THE Ne + H2+
           --> NeH+ + H REACTION

    • Authors: ezman karabulut
      Abstract: The noble gas atoms suchas He, Ne and Ar have significantly electronic ionization values around liquidnitrogen temperature (at low temperature values). Because of this feature, thenoble gases which are used for some gas detectors, and which is related certainchemical process occurring in the low temperature regions of atmosphere areencouraged to be researched. The chemical reactions subjected to these noblegas atoms have been believed to exhibit important behaviors at the sametemperature values. The investigation of their quantum effects in particularenergy range and the dependence on temperature of chemical reactions consistingof atom-diatom molecular systems include the subject of reaction dynamics. Thetitle reaction has showed stable structure feature in the interaction regionwhich is the nearest inter-atomic distance. For this reason, it causes to beexamined of dynamic effects by depending on quantum states of initial hydrogenion. The contributions of angular behaviors of hydrogen ion related to totalangular momentum and the effects of these behaviors to reaction formations areexamined via three dimensional quantum mechanical methods. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • THE EFFECT OF THE ROTATION ENERGİES OF H2+ MOLECULE ON THE Ne + H2+
           --> NeH+ + H REACTION

    • Authors: ezman karabulut
      Abstract: The noble gas atoms suchas He, Ne and Ar have significantly electronic ionization values around liquidnitrogen temperature (at low temperature values). Because of this feature, thenoble gases which are used for some gas detectors, and which is related certainchemical process occurring in the low temperature regions of atmosphere areencouraged to be researched. The chemical reactions subjected to these noblegas atoms have been believed to exhibit important behaviors at the sametemperature values. The investigation of their quantum effects in particularenergy range and the dependence on temperature of chemical reactions consistingof atom-diatom molecular systems include the subject of reaction dynamics. Thetitle reaction has showed stable structure feature in the interaction regionwhich is the nearest inter-atomic distance. For this reason, it causes to beexamined of dynamic effects by depending on quantum states of initial hydrogenion. The contributions of angular behaviors of hydrogen ion related to totalangular momentum and the effects of these behaviors to reaction formations areexamined via three dimensional quantum mechanical methods. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Asymptotic Analysis of Shearlet Transfom for Inpainting

    • Authors: Hülya Kodal Sevindir; Cüneyt Yazıcı, Süleyman Çetinkaya
      Abstract: Supply of missing data, also known as inpainting, is an important application of image processing.Wavelets are commonly used for inpainting algorithms. Shearlet transform which is an affinetransformation is the improvement of the wavelet transform. An asymptotic analysis may help to evaluatethe performance of an algorithm. In this article we compare the asymptotical analysis for wavelet andshearlet transforms in the case of inpainting where the missing data is shaped like a rectangle.  
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Asymptotic Analysis of Shearlet Transfom for Inpainting

    • Authors: Hülya Kodal Sevindir; Cüneyt Yazıcı, Süleyman Çetinkaya
      Abstract: Supply of missing data, also known as inpainting, is an important application of image processing.Wavelets are commonly used for inpainting algorithms. Shearlet transform which is an affinetransformation is the improvement of the wavelet transform. An asymptotic analysis may help to evaluatethe performance of an algorithm. In this article we compare the asymptotical analysis for wavelet andshearlet transforms in the case of inpainting where the missing data is shaped like a rectangle.  
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Conjugate Tangent Vectors, Asymptotic Directions, Euler Theorem and Dupin
           Indicatrix For k-Kinematic Surfaces

    • Authors: Yasemin Kemer; Erhan Ata
      Abstract: In this study, we define thek-kinematic surface Mg which is obtained froma surface M on Euclidean 3-surface E3 by applying rigidmotion described by quaternions to points of M. Then we investigate and calculate for this surface someimportant concepts such as shape operator, asymptotic vectors, conjugatetangent vectors, Euler theorem and Dupin indicatrix which help to understand asurface differential geometrically well. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Conjugate Tangent Vectors, Asymptotic Directions, Euler Theorem and Dupin
           Indicatrix For k-Kinematic Surfaces

    • Authors: Yasemin Kemer; Erhan Ata
      Abstract: In this study, we define thek-kinematic surface Mg which is obtained froma surface M on Euclidean 3-surface E3 by applying rigidmotion described by quaternions to points of M. Then we investigate and calculate for this surface someimportant concepts such as shape operator, asymptotic vectors, conjugatetangent vectors, Euler theorem and Dupin indicatrix which help to understand asurface differential geometrically well. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Burnout Levels of Academic Staff: An Investigation at a Public University
           in Turkey

    • Authors: Nilgün Özgül; Esra Polat
      Abstract: Burnout is an important problem inacademic life. Burnout of academic staff affect the quality of education andthe success of the students. Because, being burnout not only brings aboutinsufficiencies and illnesses in individuals, but also damages the other staffand the foundation as a result of their underperformance, psychological destructionand resignation. The aim of this study is to identify the burnout levels ofacademic staff and to evaluate the relationship between some variables ofburnout levels by using Proportional Odds Model differently from otherburnout studies about academic staff. For this purpose, 150 academiciansare selected with “Stratified Simple Sampling” method from one of the biggestPublic Universities in Ankara in Turkey, then, the personal information form and Maslach Burnout Inventory (MBI) areimplemented to them. This study isimportant for recognizing the problems of academic staff and contributing to theirproductivity and success in their work.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Burnout Levels of Academic Staff: An Investigation at a Public University
           in Turkey

    • Authors: Nilgün Özgül; Esra Polat
      Abstract: Burnout is an important problem inacademic life. Burnout of academic staff affect the quality of education andthe success of the students. Because, being burnout not only brings aboutinsufficiencies and illnesses in individuals, but also damages the other staffand the foundation as a result of their underperformance, psychological destructionand resignation. The aim of this study is to identify the burnout levels ofacademic staff and to evaluate the relationship between some variables ofburnout levels by using Proportional Odds Model differently from otherburnout studies about academic staff. For this purpose, 150 academiciansare selected with “Stratified Simple Sampling” method from one of the biggestPublic Universities in Ankara in Turkey, then, the personal information form and Maslach Burnout Inventory (MBI) areimplemented to them. This study isimportant for recognizing the problems of academic staff and contributing to theirproductivity and success in their work.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • An Investigation of Inhibition Effects of Honey, Pollen, Propolis and
           Royal Jelly Extracts on Thioredoxin Reductase Enzyme Activity

    • Authors: Ebru AKKEMİK; Gamze AKBULUT
      Abstract: The thioredoxin reductaseenzyme is an enzyme that prevents the mechanism of apoptosis from working andthus triggers the formation of cancer. Therefore, the inhibition of thethioredoxin reductase enzyme is thought to prevent or inhibit cancer. In thisstudy, the effects of extracts of plateau honey, pine honey, chestnut honey,mad or wild honey, pollen, propolis and royal jelly on thioredoxin reductaseenzyme activity were investigated. Enzyme activities were measured at constantsubstrate and different inhibitor concentrations to calculate IC50values. Over five different inhibitor concentrations were used for measuringthe inhibition constant. Total antioxidant activity were investigated in orderto compare the extracts used in the inhibition study. The strongest inhibitoryeffect was seen in the pollen methanol extract (IC50 = 2.44μg /mL)
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • An Investigation of Inhibition Effects of Honey, Pollen, Propolis and
           Royal Jelly Extracts on Thioredoxin Reductase Enzyme Activity

    • Authors: Ebru AKKEMİK; Gamze AKBULUT
      Abstract: The thioredoxin reductaseenzyme is an enzyme that prevents the mechanism of apoptosis from working andthus triggers the formation of cancer. Therefore, the inhibition of thethioredoxin reductase enzyme is thought to prevent or inhibit cancer. In thisstudy, the effects of extracts of plateau honey, pine honey, chestnut honey,mad or wild honey, pollen, propolis and royal jelly on thioredoxin reductaseenzyme activity were investigated. Enzyme activities were measured at constantsubstrate and different inhibitor concentrations to calculate IC50values. Over five different inhibitor concentrations were used for measuringthe inhibition constant. Total antioxidant activity were investigated in orderto compare the extracts used in the inhibition study. The strongest inhibitoryeffect was seen in the pollen methanol extract (IC50 = 2.44μg /mL)
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Effects of different parameter estimators to error rate in discriminant
           analysis

    • Authors: Hayrinisa Demirci Biçer; Cenker Biçer
      Abstract: Discriminant analysis is defined as a statistical technique thatclassifies a unit whose properties are measured, into one of the known finitenumbers of populations. In this classifying process, an error occurs when theunit is classified to different population from its own population. This erroris called the error rate or the probability of incorrect classification. It isdesirable to minimize this error. This study focuses on determining theparameter estimation method that provides the minimum error rate, when theparameters of Weibull populations are not known. Maximum likelihood (ML),moments (MOM) and least squares (LS) methods are chosen from among parameterestimation methods. How the error rate is affected by parameter estimators ML,MOM and LS is examined with the simulation study.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Effects of different parameter estimators to error rate in discriminant
           analysis

    • Authors: Hayrinisa Demirci Biçer; Cenker Biçer
      Abstract: Discriminant analysis is defined as a statistical technique thatclassifies a unit whose properties are measured, into one of the known finitenumbers of populations. In this classifying process, an error occurs when theunit is classified to different population from its own population. This erroris called the error rate or the probability of incorrect classification. It isdesirable to minimize this error. This study focuses on determining theparameter estimation method that provides the minimum error rate, when theparameters of Weibull populations are not known. Maximum likelihood (ML),moments (MOM) and least squares (LS) methods are chosen from among parameterestimation methods. How the error rate is affected by parameter estimators ML,MOM and LS is examined with the simulation study.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Theoratical calculations of LASO molecule by using DFT/B3LYP and
           DFT/HSEH1PBE levels

    • Authors: Hacer Pir
      Abstract: L-Argininyarı oksalat (LASO) [C6H15N4O2+.C2HO4-] molekülü sentezlendi ve IR ve 1H NMR ve 13C NMRspektroskopisi P. Vasudevan ve diğerleri tarafından çalışıldı [1]. Buçalışmada, LASO molekülünün geometrik yapısını belirlemek için ilk olarak, LASOmolekülünün moleküler geometrik yapısı Gaussian programı ile hesaplandı. LASOmolekülünün teorik harmonik titreşim dalgaları hesaplandı ve hesaplanan buveriler deneysel veriler ile karşılaştırıldı. Deneysel veriler ile teorikveriler uyumlu olarak gözlemlenmiştir. Dahası, LASO molekülü NMR spektrumçalışmaları ile açıklandı. Son olarak, lineer olmayan optik (NLO) özelliklerin analizi,sınır moleküler orbitalleri, moleküler yüzeyler ve Mulliken, APT and NBO popülasyonlarıincelendi. Tüm teorik hesaplamalar yoğunluk fonksiyonel teori (DFT) ile B3LYP/6-311++ G (d, p) ve HSEH1PBE/6-311 ++ G (d, p) seviyelerinde hesaplandı.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Theoratical calculations of LASO molecule by using DFT/B3LYP and
           DFT/HSEH1PBE levels

    • Authors: Hacer Pir
      Abstract: L-Argininyarı oksalat (LASO) [C6H15N4O2+.C2HO4-] molekülü sentezlendi ve IR ve 1H NMR ve 13C NMRspektroskopisi P. Vasudevan ve diğerleri tarafından çalışıldı [1]. Buçalışmada, LASO molekülünün geometrik yapısını belirlemek için ilk olarak, LASOmolekülünün moleküler geometrik yapısı Gaussian programı ile hesaplandı. LASOmolekülünün teorik harmonik titreşim dalgaları hesaplandı ve hesaplanan buveriler deneysel veriler ile karşılaştırıldı. Deneysel veriler ile teorikveriler uyumlu olarak gözlemlenmiştir. Dahası, LASO molekülü NMR spektrumçalışmaları ile açıklandı. Son olarak, lineer olmayan optik (NLO) özelliklerin analizi,sınır moleküler orbitalleri, moleküler yüzeyler ve Mulliken, APT and NBO popülasyonlarıincelendi. Tüm teorik hesaplamalar yoğunluk fonksiyonel teori (DFT) ile B3LYP/6-311++ G (d, p) ve HSEH1PBE/6-311 ++ G (d, p) seviyelerinde hesaplandı.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Structural, Conformational and Spectroscopic Properties of C16H16BrNO3
           Schiff-Base Molecule: A Theoretical Investigation

    • Authors: Meryem Evecen
      Abstract: The Schiff- bases compound C16H16BrNO3molecular geometry, vibrational frequencies and electronic properties(total energy, dipole moment,electronegativity, chemical hardness and softness) were investigated usingDFT(B3LYP) method. Besides, the conformational analysis was made with respectto selected degrees of torsional freedom τ(C3-C2-C1-N1)torsional. Molecularelectrostatic potential (MEP), frontier molecular orbital energies and NBO analysis of molecule have been performedby using Gaussian 09W program. The NLO analysis indicates that thismolecule can be evaluated as an attractive object for nonlinear opticalmaterial studies. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Structural, Conformational and Spectroscopic Properties of C16H16BrNO3
           Schiff-Base Molecule: A Theoretical Investigation

    • Authors: Meryem Evecen
      Abstract: The Schiff- bases compound C16H16BrNO3molecular geometry, vibrational frequencies and electronic properties(total energy, dipole moment,electronegativity, chemical hardness and softness) were investigated usingDFT(B3LYP) method. Besides, the conformational analysis was made with respectto selected degrees of torsional freedom τ(C3-C2-C1-N1)torsional. Molecularelectrostatic potential (MEP), frontier molecular orbital energies and NBO analysis of molecule have been performedby using Gaussian 09W program. The NLO analysis indicates that thismolecule can be evaluated as an attractive object for nonlinear opticalmaterial studies. 
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Bisector Surfaces Through A Common Line of Curvatures and Its
           Classifications

    • Authors: Muhammed Talat SARIAYDIN
      Abstract: In this paper, we study the Bisector surface, which definesthe line of curvature on a surface play an importance role. Firstly, theBisector surface constructed by a point and a space curve given in Euclidean3-space. Then, it is investigated that the necessary and sufficient conditionfor directrix curve of this surface to satisfy line of curvature. After this,we classify the Bisector surfaces.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Bisector Surfaces Through A Common Line of Curvatures and Its
           Classifications

    • Authors: Muhammed Talat SARIAYDIN
      Abstract: In this paper, we study the Bisector surface, which definesthe line of curvature on a surface play an importance role. Firstly, theBisector surface constructed by a point and a space curve given in Euclidean3-space. Then, it is investigated that the necessary and sufficient conditionfor directrix curve of this surface to satisfy line of curvature. After this,we classify the Bisector surfaces.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Preparation of Nano Polymeric Thiophenes and Characterization of the
           Structures

    • Authors: Sezen SİVRİKAYA; Sefa DURMUŞ, Aslıhan DALMAZ
      Abstract: Thisarticle describes a chemical oxidative polymerization for the preparation ofnano polymeric thiophene by using FeCl3 as oxidant. 2-thiophenecarboxaldehyde(2-THCA) as monomer was used at polymerization process. The structure ofsynthesized nano polymeric thiophene was confirmed by  scanning electron microscopy (SEM), Fouriertransform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), RamanSpectroscopy, and elemental analysis of C, H, O and S. SEM images showed thatthe poly(2-thiophenecarboxaldehyde) (PTHCA) was synthesized in nanoscale and hada homogeneous and smooth structure. The size of the synthesized nano particleswas not more than 35 nm. Thermal analysis of nano polymeric thiophene showedthermally stable up to 512 OC. When elemental analysis results of PTHCA wereexamined, it was seen that the obtained data after the synthesis of nanopolymeric thiophene and the determined data theoretically were agree with eachother.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Preparation of Nano Polymeric Thiophenes and Characterization of the
           Structures

    • Authors: Sezen SİVRİKAYA; Sefa DURMUŞ, Aslıhan DALMAZ
      Abstract: Thisarticle describes a chemical oxidative polymerization for the preparation ofnano polymeric thiophene by using FeCl3 as oxidant. 2-thiophenecarboxaldehyde(2-THCA) as monomer was used at polymerization process. The structure ofsynthesized nano polymeric thiophene was confirmed by  scanning electron microscopy (SEM), Fouriertransform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), RamanSpectroscopy, and elemental analysis of C, H, O and S. SEM images showed thatthe poly(2-thiophenecarboxaldehyde) (PTHCA) was synthesized in nanoscale and hada homogeneous and smooth structure. The size of the synthesized nano particleswas not more than 35 nm. Thermal analysis of nano polymeric thiophene showedthermally stable up to 512 OC. When elemental analysis results of PTHCA wereexamined, it was seen that the obtained data after the synthesis of nanopolymeric thiophene and the determined data theoretically were agree with eachother.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Numerical Solutions of the Gardner Equation via Trigonometric Quintic
           B-spline Collocation Method

    • Authors: Özlem Ersoy Hepson
      Abstract: The main purpose of this paper is to get the numericalsolutions of the Gardner equation which are widely used in various disciplines.For this purpose, the time integration of the system is achieved by theclassical Crank-Nicolson method owing to its large stability region. Spacediscretization is done by using the trigonometric quintic B-spline functions.Thus the Gardner equation turns into a penta diagonoal matrix equation and theThomas algorithm is applied.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Numerical Solutions of the Gardner Equation via Trigonometric Quintic
           B-spline Collocation Method

    • Authors: Özlem Ersoy Hepson
      Abstract: The main purpose of this paper is to get the numericalsolutions of the Gardner equation which are widely used in various disciplines.For this purpose, the time integration of the system is achieved by theclassical Crank-Nicolson method owing to its large stability region. Spacediscretization is done by using the trigonometric quintic B-spline functions.Thus the Gardner equation turns into a penta diagonoal matrix equation and theThomas algorithm is applied.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • The theoretical investigation of global reactivity descriptors, NLO
           behaviours and bioactivity scores of some norbornadiene derivatives

    • Authors: Serpil Eryılmaz
      Abstract: In this study, global reactivity descriptors such as ionization potential, electron affinity, electronegativity, chemical hardness, softness and electrophilicity index of norbornadiene derivatives which include some halogen atoms and atom groups, have been investigated with DFT/BPV86/B3LYP/B3PW91 methods with 6-31G(d,p) basis set. To determine the non-linear optical behaviours of the structures, the total dipole moment,  polarizability,and first-order hyperpolarizabilityvalues have been examined at the same theoretical level. It has been determined that thiol-bonded groups on comparison with others have a much better NLO material property. In addition, the potentials of the structures as drug-active compounds have been inspected with Lipinski’s rule of 5 and bioactivity scores. Thiol and hydroxyl-bonded groups have a good drug-likeness and bioactivity score relative to the others.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • The theoretical investigation of global reactivity descriptors, NLO
           behaviours and bioactivity scores of some norbornadiene derivatives

    • Authors: Serpil Eryılmaz
      Abstract: In this study, global reactivity descriptors such as ionization potential, electron affinity, electronegativity, chemical hardness, softness and electrophilicity index of norbornadiene derivatives which include some halogen atoms and atom groups, have been investigated with DFT/BPV86/B3LYP/B3PW91 methods with 6-31G(d,p) basis set. To determine the non-linear optical behaviours of the structures, the total dipole moment,  polarizability,and first-order hyperpolarizabilityvalues have been examined at the same theoretical level. It has been determined that thiol-bonded groups on comparison with others have a much better NLO material property. In addition, the potentials of the structures as drug-active compounds have been inspected with Lipinski’s rule of 5 and bioactivity scores. Thiol and hydroxyl-bonded groups have a good drug-likeness and bioactivity score relative to the others.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Asymptotically Lacunary I-Invariant Statistical Equivalence of Sequences
           of Sets Defined By A Modulus Function

    • Authors: Erdinç Dundar; Nimet P. Akın, Uğur Ulusu
      Abstract: Inthis paper, we introduce the concepts of strongly asymptotically lacunary  I-invariant equivalence, f-asymptoticallylacunary I-invariant equivalence, strongly  f-asymptotically lacunary I-invariant equivalence and asymptotically lacunary I-invariant statistical equivalence for sequences ofsets. Also, we investigate some relationships among these concepts.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Asymptotically Lacunary I-Invariant Statistical Equivalence of Sequences
           of Sets Defined By A Modulus Function

    • Authors: Erdinç Dundar; Nimet P. Akın, Uğur Ulusu
      Abstract: Inthis paper, we introduce the concepts of strongly asymptotically lacunary  I-invariant equivalence, f-asymptoticallylacunary I-invariant equivalence, strongly  f-asymptotically lacunary I-invariant equivalence and asymptotically lacunary I-invariant statistical equivalence for sequences ofsets. Also, we investigate some relationships among these concepts.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Approximation By Three-Dimensional q-Bernstein-Chlodowsky Polynomials

    • Authors: Nazmiye Gönül Bilgin; Merve ÇETİNKAYA
      Abstract: In the present paper we introduce positive linear three-dimensionalBernstein-Chlodowsky polynomials on a non-tetrahedron domain and we get theirq-analogue. We obtain aproximation properties for these positive linear operatorsand their generalizations in this work. The rate of convergence of this operatorsis calculated by means of the modulus of continuity.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Approximation By Three-Dimensional q-Bernstein-Chlodowsky Polynomials

    • Authors: Nazmiye Gönül Bilgin; Merve ÇETİNKAYA
      Abstract: In the present paper we introduce positive linear three-dimensionalBernstein-Chlodowsky polynomials on a non-tetrahedron domain and we get theirq-analogue. We obtain aproximation properties for these positive linear operatorsand their generalizations in this work. The rate of convergence of this operatorsis calculated by means of the modulus of continuity.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Length-weight relationship and condition of Arnoglossus kessleri Schmidt,
           1915 in Iskenderun Bay (Eastern Mediterranean, Turkey)

    • Authors: Sibel Alagöz Ergüden; Ayhan Altun, Deniz Ergüden
      Abstract: Length weight relationship (LWR) studies have animportant role in estimating population biomass, determining growth rate andstock status of fishes. In this study a totalof 133 scaldback, Arnoglossus kessleri Schmidt,1915 were caught in IskenderunBay between September2014 and May 2015 using a commercial bottom trawler. As a result, the estimatesfor b parameter of the LWR ranged between and 2.97, 2.68 and 2.74 for males,females and both sexes, respectively. Fulton’s condition (KF)factor values also revealed significant variations (p<0.01) for female(1.089) and male (1.100) specimens of A.kessleri. The 11.9 cmlong male individual found in this study was the longest individual recordedfor the Mediterranean Sea. No informationcurrently exists on the length weight relationship of A. kessleri in the Mediterranean coast of Turkey.Therefore, this paper is an important contribution to the science and fisheriesmanagement applications for this species.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • Length-weight relationship and condition of Arnoglossus kessleri Schmidt,
           1915 in Iskenderun Bay (Eastern Mediterranean, Turkey)

    • Authors: Sibel Alagöz Ergüden; Ayhan Altun, Deniz Ergüden
      Abstract: Length weight relationship (LWR) studies have animportant role in estimating population biomass, determining growth rate andstock status of fishes. In this study a totalof 133 scaldback, Arnoglossus kessleri Schmidt,1915 were caught in IskenderunBay between September2014 and May 2015 using a commercial bottom trawler. As a result, the estimatesfor b parameter of the LWR ranged between and 2.97, 2.68 and 2.74 for males,females and both sexes, respectively. Fulton’s condition (KF)factor values also revealed significant variations (p<0.01) for female(1.089) and male (1.100) specimens of A.kessleri. The 11.9 cmlong male individual found in this study was the longest individual recordedfor the Mediterranean Sea. No informationcurrently exists on the length weight relationship of A. kessleri in the Mediterranean coast of Turkey.Therefore, this paper is an important contribution to the science and fisheriesmanagement applications for this species.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A collocation method for solving boundary value problems of fractional
           order

    • Authors: SERTAN ALKAN; AYDIN SEÇER
      Abstract: In this paper, the sinc collocation method is used to obtain the solution of the second-order fractional boundary value problems based on the conformable fractional derivative. For this purpose a theorem is proved to represent the terms having fractional derivatives in terms of sinc basis functions. To show the efficiency and accuracy of the present method, some problems are solved and the obtained solutions are compared with the approximate solutions obtained by using the other numerical methods as well as the exact solutions of the problems.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
  • A collocation method for solving boundary value problems of fractional
           order

    • Authors: SERTAN ALKAN; AYDIN SEÇER
      Abstract: In this paper, the sinc collocation method is used to obtain the solution of the second-order fractional boundary value problems based on the conformable fractional derivative. For this purpose a theorem is proved to represent the terms having fractional derivatives in terms of sinc basis functions. To show the efficiency and accuracy of the present method, some problems are solved and the obtained solutions are compared with the approximate solutions obtained by using the other numerical methods as well as the exact solutions of the problems.
      PubDate: Sat, 01 Dec 2018 00:00:00 +030
       
 
 
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