Journal Cover
Journal of Natural and Applied Sciences
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 1308-6529
Published by Süleyman Demirel Üniversitesi Homepage  [9 journals]
  • Kapak ve İçindekiler

    • Authors: Kapak ve İçindekiler
      Abstract: Bu dergi, aşağıda listelenen veri tabanları tarafından taranmaktadır / This journal is indexed by the following abstracting and indexing databases:BASE, CAB s, CAS (Chemical s Service), CiteFactor, CNKI Scholar, DOAJ, DRJI, EBSCO Discovery Service (EDS), Google Scholar, Index Copernicus, InfoBase Index, JournalTOCs, OAJI, ResearchBib, Ulakbim TR Dizin (Mühendislik ve Temel Bilimler), WorldCat (OCLC), Zentralblatt MATH
      PubDate: 2018-04-16
      Issue No: Vol. 22, No. 1 (2018)
  • On a New Type of q-Baskakov Operators

    • Authors: Ersin ŞİMŞEK
      Abstract: In this work, we have introduced a new type of $q$-analogous of Baskakov Operators.  Their respective formulae for central moments are thereby obtained. The approximation properties and the approximation rapid of the sequences of the operators which are defined have been established in terms of the  modulus of smoothness.
      PubDate: 2018-03-29
      Issue No: Vol. 22, No. 1 (2018)
  • Determination of Optimum Insulation Thickness Distribution for

    • Authors: Hakan DEMİR
      Abstract: Most of electricity is consumed in either commercial or domestic refrigeration systems. Since the outer volume is determined, inner volume of a refrigeration system is important for a specified energy consumption. Therefore, the optimum distribution of insulation material according to inside and outside conditions for on and off time of a refrigerator is very important. Uniform distribution of insulation material is useful only convection and conduction resistances are the same for all sides and also on and off periods. In this study, a general solution of the optimum distribution of thermal insulation material for a given insulation material volume or given inner volume is suggested for refrigeration systems and also explained by a case study.
      PubDate: 2018-03-29
      Issue No: Vol. 22, No. 1 (2018)
  • Experimental Investigation of Gamma Radiation Attenuation Coefficients for
           Kırklareli Marble

    • Authors: Nimet ZAIM, Duygu HATIPOGLU
      Abstract: The total linear and mass attenuation coefficients, half-value and tenth-value thickness of marble samples from Kırklareli Province have been investigated using different gamma ray energies. Three different gamma ray energies one at 661.7 keV from Cs-137 and others at 1173.2 and at 1332.5 keV from Co-60 have been used. The measurements were carried out using a gamma spectrometer containing a NaI(Tl) sintilation detector. Comparison between the results from measurements and from computer code of XCOM has also been performed with the results available in literature. The measurement results obtained from marble disks and tablets of limestone powder were also matched.
      PubDate: 2018-03-29
      Issue No: Vol. 22, No. 1 (2018)
  • A Fuzzy Modeling Approach for Replicated Response Measures Based on
           Fuzzification of Replications with Descriptive Statistics and Golden Ratio

    • Authors: Özlem TÜRKŞEN
      Abstract: Some of the experimental designs can be composed of replicated response measures in which the replications cannot be identified exactly and may have uncertainty different than randomness. Then, the classical regression analysis may not be proper to model the designed data because of the violation of probabilistic modeling assumptions. In this case, fuzzy regression analysis can be used as a modeling tool. In this study, the replicated response values are newly formed to fuzzy numbers by using descriptive statistics of replications and golden ratio. The main aim of the study is obtaining the most suitable fuzzy model for replicated response measures through fuzzification of the replicated values by taking into account the data structure of the replications in statistical framework. Here, the response and unknown model coefficients are considered as triangular type-1 fuzzy numbers (TT1FNs) whereas the inputs are crisp. Predicted fuzzy models are obtained according to the proposed fuzzification rules by using Fuzzy Least Squares (FLS) approach. The performances of the predicted fuzzy models are compared by using Root Mean Squared Error (RMSE) criteria. A data set from the literature, called wheel cover component data set, is used to illustrate the performance of the proposed approach and the obtained results are discussed. The calculation results show that the combined formulation of the descriptive statistics and the golden ratio is the most preferable fuzzification rule according to the well-known decision making method, called TOPSIS, for the data set.
      PubDate: 2018-03-23
      Issue No: Vol. 22, No. 1 (2018)
  • Modification of Morphological, Structural and Optical Properties of
           CBD-Based Growth of PbS Films on Glass Substrates by Addition of Saccharin

    • Authors: Yasin YÜCEL, Ersin YÜCEL
      Abstract: Saccharin which so-called as benzoic sulfimide is an artificial sweetener. In this paper, nanostructured lead sulfide (PbS) thin films were produced in the presence of additive known as saccharin via chemical bath deposition (CBD). Effect of the saccharin content on the morphological, optical and structural properties of the films has been investigated. Lead sulfide (PbS) films that included additive were prepared at five different concentrations of saccharin (from 0 to 5%). The fabricated samples were characterized by surface roughness, scanning electron microscopy (SEM), X-Ray diffraction and UV-vis spectroscopy. It was found that the presence of saccharin highly affected the optical and structural properties of PbS thin films. According to the X-Ray diffraction results, crystallite size values of the films decreased from 12.88 to 5.25 nm with increasing of saccharin content. UV-vis measurements showed that both the band gap and transmission properties of the films increased as a result of increasing saccharin concentration. Further, Surface roughness measurements exhibited that average surface roughness was diminished with increasing saccharin content. As a result, it has been found that the presence of saccharin in growth solution played a significant mission in adjusting the main physical properties of the samples.
      PubDate: 2018-03-17
      Issue No: Vol. 22, No. 1 (2018)
  • Evaluation of Antifungal Potentials and Antioxidant Capacities of Some
           Foliose Lichen Species

    • Authors: Bahar BİLGİN SÖKMEN, Kadir KINALIOĞLU, Sinem AYDIN
      Abstract: This work is aimed to assess of antioxidant and antifungal potential of the foliose lichen species: Flavoparmelia caperata, Xanthoparmelia stenophylla and Xanthoparmelia conspersa. The antifungal activity of lichens were studied against some pathogenic fungi by disc diffusion method. The acetonitrile extracts of these lichens were obtained with Soxhlet extraction. While F. caperata exhibited maximum antifungal activity (32 mm) against the C. albicans, the minimum antifungal activity (10 mm) was obtained from X. stenophylla lichen against S. cerevisiae. In CUPRAC assay, absorbance values was in order of BHT>X. conspersa>F. caperata>X. stenophylla. As a result of the study, it was concluded that these lichen species may be a potential source for the development of new antifungal and antioxidant compounds.
      PubDate: 2018-03-17
      Issue No: Vol. 22, No. 1 (2018)
  • An Automatic Multilevel Facial Expression Recognition System

    • Authors: Elena BATTINI SÖNMEZ
      Abstract: Facial expression is one of the most natural way of human beings to communicate his-her internal feeling, to stress his-her words, to agree or disagree with the interlocutor, to regulate interaction with the environment and nearby people. This paper challenges the classification experiment run by human beings on the ADFES-BIV database, which is a recently introduced collection of videos expressing low, middle, and high intensity emotions. The proposed automatic system uses the Sparse Representation based Classifier and reaches the top performance of 80 % by considering the temporal information intrinsically present in the videos.
      PubDate: 2018-03-16
      Issue No: Vol. 22, No. 1 (2018)
  • A New Lichenicolous Fungus Record From The Turkey, Tremella macrobasidiata
           (Basidiomycota, Tremellales)

    • Authors: Mustafa KOCAKAYA, Zekiye KOCAKAYA, Duygu KAYA, Mehmet Ünsal BARAK
      Abstract: Despite the recent increase in studies on lichenicolous fungi in Turkey, there is still no checklist. A key to lichenicolous fungus prepared by Halıcı (2008) were published 118 taxa from the Turkey. So far, the numbers of lichenicol fungi known in Turkey is 193. Generally, lichenicol Ascomycota and mitosporic fungi records are reported, whereas lichenicol Basidiomycota recording is rare. Tremella macrobasidiata is reported on Lecanora chlarotera from Turkey for the first time. The morphological, anatomical and ecological characteristics of the species are given. In addition, a phylogenetic tree was constructed by comparing the sequence data of the ITS region of closely related species.
      PubDate: 2018-03-14
      Issue No: Vol. 22, No. 1 (2018)
  • Analysis of the Leeb Hardness Test Data Obtained by Using Two Different
           Rock Core Holders

    • Authors: Nurdan GÜNEŞ YILMAZ, R. Mete GÖKTAN
      Abstract: In this study, an investigation was carried out to elucidate if the core holder type affects the measured Leeb hardness values (HL) of rock materials obtained by using the Equotip hardness tester. To achieve this goal, NX-size core specimens of different rock samples were subjected to Leeb hardness testing by employing an ‘Arch-shaped’ and a ‘V-shaped’ core holder. The results indicated a strong degree of linear correlation (R2  0.95) between mean rebound hardness values determined in the arch-shaped holder (HLA) and V-shaped holder (HLV). The maximum difference in HL values obtained from the two holders was 74.2 units on the HL-scale, corresponding to a difference of 10.2 %. Although the differences in magnitudes of HLA and HLV values were small and varied from one rock variety to another, there was a tendency of the V-shaped holder to give relatively lower values. On the other hand, when compared to the minimum values, a higher statistical correspondence was observed between maximum HLA and HLV values. The results also showed that it is possible to predict uniaxial compressive strength of the tested rocks reliably by employing any of the holders.
      PubDate: 2018-03-01
      Issue No: Vol. 22, No. 1 (2018)
  • Qualitative and Quantitative Examination of Algal Flora in the Gut Content
           of Tanypus punctipennis Meigen, 1818

    • Authors: Burak ÖTERLER, Gazel Burcu AYDIN, Belgin ÇAMUR ELİPEK
      Abstract: Larval chironomids feed on algae, diatomae, detritus, decaying plant and animal fragments. The larvae in turn are food for other carnivore and omnivore animals. Thus, larval chironomids have a very important role in the aquatic food cycle. In this study, the algal flora in the stomachs of Tanypus punctipennis, which is known as a very common species in Turkish Thrace, was examined in terms of qualitative and quantitative factors. It was found that Bacillariophyta was the dominant group with 43 taxa in the stomach of T. punctipennis. It was followed by Cyanophyta with 7 taxa, Euglenophyta with 6 taxa, Chlorophyta with 4 taxa, Carophyta with 2 taxa, and Rhodophyta with 1 taxa.
      PubDate: 2018-02-23
      Issue No: Vol. 22, No. 1 (2018)
  • Investigation of Environmental-friendly Technology for a Paint Industry
           Wastewater Plant in Turkey

    • Authors: Pelin YAPICIOĞLU
      Abstract: Paint manufacturing process has several unfavorable aspects to the environment in Turkey. One of these impacts is wastewater treatment. Paint wastewater contains huge amounts of toxic chemical substances, bio refractory compounds, pigments and microorganisms. So, advanced treatment requirement is available to dispose of colour, microorganisms and chemical oxygen demand (COD). The high organic content of wastewater causes serious environmental challenges and contamination for the living organisms and the ecosystem in the receiver media unless it is treated adequately. In this context, the treatment process to be implemented should be preferred in such a way as to give the least damage to the environment. In this study, three treatment scenarios that contain electrocoagulation (Scenario-1), Fenton process (Scenario-2) and membrane distillation (Scenario-3) have been created for wastewater treatment facility of a paint industry in Turkey. For three scenarios, environmental impact assessment has been carried out with Fine-Kinney method. It is aimed to choose best environmental technology before investment. The evaluation results revealed that Scenario-2 has the less environmental impacts that total impact value is 556. Scenario-1 has the highest total impact value as 756, relatively. Total impact value related to Scenario-3 is 637. According to the evaluation results, Fenton process is the best environmental-friendly treatment technology for wastewater treatment of a paint industry in Turkey.
      PubDate: 2018-02-21
      Issue No: Vol. 22, No. 1 (2018)
  • Structural, Spectroscopic (FT-IR, Raman and NMR), Non-linear Optical
           (NLO), HOMO-LUMO and Theoretical (DFT/CAM-B3LYP) Analyses of
           N-Benzyloxycarbonyloxy-5-Norbornene-2,3-Dicarboximide Molecule

    • Authors: Nuri ÖZTÜRK, Yelda Bingöl ALPASLAN, Gökhan ALPASLAN, Can ALAŞALVAR, Halil GÖKCE
      Abstract: The experimental spectroscopic investigation of N-benzyloxycarbonyloxy-5-norbornene-2,3-dicarboximide (C17H15NO5) molecule has been done using 1H and 13C NMR chemical shifts, FT-IR and Raman spectroscopies. Conformational forms have been determined depending on orientation of N-benzyloxycarbonyloxy and 5-norbornene-2,3-dicarboximide (NDI) groups of the title compound. The structural geometric optimizations, vibrational wavenumbers, NMR chemical shifts (in vacuum and chloroform) and HOMO-LUMO analyses for all conformers of the title molecule have been done with DFT/CAM-B3LYP method at the 6-311++G(d,p) basis set. Additionally, based on the calculated HOMO and LUMO energy values, some molecular properties such as ionization potential (I), electron affinity (A), electronegativity (χ), chemical hardness (h), chemical softness (z), chemical potential (μ) and electrophilicity index (w) parameters are determined for all conformers. The non-linear optical (NLO) properties have been studied for the title molecule. We can say that the experimental spectral data are in accordance with calculated values.
      PubDate: 2018-02-21
      Issue No: Vol. 22, No. 1 (2018)
  • Comparison of Sampling Methods for Annual Industry and Service Statistics
           Survey by TURKSTAT

    • Authors: Sibel ŞAHİN, Süleyman ALPAYKUT
      Abstract: The Annual Industry and Service Statistics is one of the largest surveys, conducted by Turkish Statistical Institute, which aims to determine changes in economic structure in Turkey. Both full enumeration and sampling methods are used in this survey. Nevertheless, the percentage of full enumeration increases every year. Even though efforts have been made in order to be used administrative records in recent years, this could not satisfy all of the necessary information needed. Hence, it is believed that there is a requirement to decrease the size of the survey. In this study, it is aimed to propose a sampling method for part of the Annual Industry and Service Statistics Survey conducted with the enumeration and to compare the suggested methods. For that purpose, in the first phase, stratified sampling is used and then the comparison is made by using three different sampling methods within the strata, namely poisson, systematic and simple random sampling. The size of the survey is reduced by using sampling methods, but the economic activity classification together with the level of estimation to the regions increase. It is concluded that the best estimations and minimum variances are obtained when poisson and simple random sampling methods are applied together.
      PubDate: 2018-02-09
      Issue No: Vol. 22, No. 1 (2018)
  • Black Holes with Anisotropic Fluid in Lyra Scalar-Tensor Theory

    • Authors: Melis ULU DOĞRU, Murat DEMİRTAŞ
      Abstract: In this paper, we investigate distribution of anisotropic fluid which is a resource of black holes in regard to Lyra scalar-tensor theory. As part of the theory, we obtain field equations of spherically symmetric space-time with anisotropic fluid. By using field equations, we suggest distribution of anisotropic fluid, responsible for space-time geometries such as Schwarzschild, Reissner-Nordström, Minkowski type, de Sitter type, Anti-de Sitter type, BTZ and charged BTZ black holes. Finally, we discuss obtained pressures and density of the fluid for different values of arbitrary constants, geometrically and physically.
      PubDate: 2018-02-05
      Issue No: Vol. 22, No. 1 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
Home (Search)
Subjects A-Z
Publishers A-Z
Your IP address:
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-