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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 426 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
AAS Open Research     Open Access  
ABC Journal of Advanced Research     Open Access  
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 17)
Acta Materialia Transilvanica     Open Access  
Acta Nova     Open Access  
Acta Scientifica Malaysia     Open Access  
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 11)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 3)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 4)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 2)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 21)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 10)
American Scientist     Full-text available via subscription   (Followers: 12)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access  
Apuntes de Ciencia & Sociedad     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Archives of Current Research International     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access  
Asian Journal of Advanced Research and Reports     Open Access   (Followers: 1)
Asian Journal of Applied Science and Engineering     Open Access  
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 2)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 7)
Avrasya Terim Dergisi     Open Access  
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access  
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
Berkeley Scientific Journal     Full-text available via subscription  
BIBECHANA     Open Access  
BibNum     Open Access  
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Bioethics Research Notes     Full-text available via subscription   (Followers: 16)
Bistua : Revista de la Facultad de Ciencias Básicas     Open Access  
BJHS Themes     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Central European Journal of Clinical Research     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia Amazónica (Iquitos)     Open Access  
Ciencia en Desarrollo     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Citizen Science : Theory and Practice     Open Access   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Applied Sciences     Open Access  
Comprehensive Therapy     Hybrid Journal   (Followers: 3)
Comunicata Scientiae     Open Access  
ConCiencia     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access  
Cuadernos de Investigación UNED     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
Current Research in Geoscience     Open Access   (Followers: 6)
Dalat University Journal of Science     Open Access  
Data Curation Profiles Directory     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Dharmakarya     Open Access  
Diálogos Interdisciplinares     Open Access  
Digithum     Open Access   (Followers: 2)
Discover Sustainability     Open Access   (Followers: 2)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 6)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Estação Científica (UNIFAP)     Open Access  
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 2)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access  
Extensionismo, Innovación y Transferencia Tecnológica     Open Access  
Facets     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Fontanus     Open Access  
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 236)
Frontiers for Young Minds     Open Access  
Frontiers in Climate     Open Access   (Followers: 3)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access   (Followers: 3)
Futures & Foresight Science     Hybrid Journal   (Followers: 2)
Gaudium Sciendi     Open Access  
Gazi University Journal of Science     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 14)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Global Journal of Science Frontier Research     Open Access   (Followers: 1)
Globe, The     Full-text available via subscription   (Followers: 3)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access  
Himalayan Journal of Science and Technology     Open Access  
History of Science and Technology     Open Access   (Followers: 1)
Hoosier Science Teacher     Open Access  
Impact     Open Access   (Followers: 1)
Indian Journal of History of Science     Hybrid Journal  
Indonesian Journal of Fundamental Sciences     Open Access  
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 1)
Indonesian Journal of Science and Technology     Open Access  
Ingenieria y Ciencia     Open Access   (Followers: 1)
Innovare : Revista de ciencia y tecnología     Open Access  
Integrated Research Advances     Open Access  
Interciencia     Open Access  
Interface Focus     Full-text available via subscription  
International Annals of Science     Open Access  
International Archives of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Culture and Modernity     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
International Journal of Innovation and Applied Studies     Open Access   (Followers: 3)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Research in Science     Open Access   (Followers: 1)
International Journal of Science & Emerging Technologies     Open Access   (Followers: 1)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Letters of Social and Humanistic Sciences     Open Access  
International Scientific and Vocational Studies Journal     Open Access  
InterSciencePlace     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 1)
Issues in Science & Technology     Free   (Followers: 7)
Ithaca : Viaggio nella Scienza     Open Access  
Jaunujų mokslininkų darbai     Open Access  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 10)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Al-Qadisiyah for Pure Science     Open Access  
Journal of Alasmarya University     Open Access  
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 3)
Journal of Deliberative Mechanisms in Science     Open Access  
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of Integrated Science and Technology     Open Access  
Journal of Kerbala University     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Natural Sciences and Mathematics Research     Open Access  
Journal of Natural Sciences Research     Open Access   (Followers: 1)
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science (JSc)     Open Access  
Journal of Science and Engineering     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Science of the University of Kelaniya Sri Lanka     Open Access  
Journal of Scientific Research     Open Access  
Journal of Scientific Research and Reports     Open Access  
Journal of Scientometric Research     Open Access   (Followers: 19)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Asiatic Society of Bangladesh, Science     Open Access  

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Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1301-4048 - ISSN (Online) 2147-835X
Published by Sakarya Üniversitesi Homepage  [3 journals]
  • In-Plane Buckling of Open-Section Shell Segments

    • Authors: Haluk YILMAZ; İbrahim KOCABAŞ
      Abstract: The present study investigates elastic buckling behavior of open-section shell segments under action of a central radial load. A design parameter is expressed to characterize the influence of fillet radius on load-bearing capacity. A reduction factor equation is developed as a multivariate function of shell parameters, which evaluates the amount of decrease in load-bearing capacity of the structure caused by the corner fillet. In addition, an expression to predict limit load of the shell structure under clamped end conditions is introduced. Furthermore, a parametric study is performed to reveal the influence of fillet radius and radius-to-thickness ratio on the limit load as well as deformation patterns of the open-section shells. Results show that corner fillets has a significant effect on the limit load of the open-section shell segments under in-plane loading.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Preparation and Characterization of Biocompatible Membranes Based on TiO2
           Nanoparticul

    • Authors: Gülşen TAŞKIN ÇAKICI
      Abstract: In this study, biocompatible composite membranes of sodium alginate/hydroxypropyl methylcellulose (NaAlg/HPMC) based on nano-titanium dioxide (n-TiO2) were prepared. Regarding the preparation processes of these membranes, the amount of citric acid [5%, 15%, 30% (w/w)] added to the NaAlg/HPMC blend, the crosslinker type (glutaraldehyde, acetone/water with glutaraldehyde, CaCl2), and the amount of n-TiO2 [5%, 15%, 20% (w/w)] were studied and optimum conditions were determined. When the equilibrium swelling values were examined, it was observed that the one with the least swelling was the CaCl2 crosslinked membrane. Fourier Transform Infrared (FTIR) Spectroscopy, Differential Scanning Calorimetry (DSC), and Scanning Electron Microscopy (SEM) were used to characterize the modified crosslinked membranes. The FTIR analysis results showed the formation of hydrogen bonds between the hydroxyl groups of the HPMC and NaAlg polymer chains. The DSC analysis showed the existence of single glass transition temperature (Tg) which indicated the compatibility and physical interaction between the NaAlg and HPMC polymer chains for NaAlg / HPMC mixtures.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • A Comparative Investigation of the Mechanical Properties of Single and Bi
           Layer MoS2 Structures: Influences of Defect, Strain Rate and Temperature

    • Authors: Ahmet Emin ŞENTÜRK
      Abstract: In this paper, the mechanical properties of single and bi layer molybdenum disulfide (MoS2) structures are investigated using uniaxial tensile molecular dynamics (MD) simulation. According to the results of MD simulations, these structures show superior mechanical properties (failure strain, ultimate tensile strength and Young’s modulus) for various applications of nanodevice. The mechanical properties of single and bi layer MoS2 structures are studied at four different temperatures between 300 K and 900 K and different strain rates from 107 s-1 to 109 s-1. As temperature increases up to 900 K, the mechanical properties of single and bi layer MoS2 structures gradually decrease, due to the high temprerature’s weakening effect. Also, changing of temperatures shows more effect on the bi layer MoS2 structure than single layer MoS2 structure. Furthermore, MD results show that the mechanical properties of single and bi layer MoS2 structures demonstrate increasing trend when the strain rate increases. Different strain rates indicate similar effects on the mechanical properties of single and bi layer MoS2 structures. On the other hand, the mechanical properties of these structures are adversely affected by structural defects. Accordingly, the influences of two different S atom types vacancy defect on the mechanical properties of single and bi layer MoS2 structures are examined. When the vacancy defect concentrations in MoS2 structures increase, the mechanical properties of these structures decrease significantly. In addition, S atom bi vacancy defects type exerts more effect on the mechanical properties of single and bi layer MoS2 structures than S atom single vacancy defect type do by increasing concentration. Additionally, vacancy defects indicate more influence on the bi layer MoS2 structure than single layer MoS2 structure. Finally, the results of this study make them excellent candidate for nano-mechanical systems.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Analysis of the Saliency Ratio Effect on the Output Torque and the System
           Efficiency in IPM Drives

    • Authors: Osman Emre ÖZÇİFLİKÇİ; Mikail KOÇ
      Abstract: Permanent magnet synchronous motors (PMSM) can be classified into two groups based on the rotor saliency structure as surface mounted permanent magnet synchronous motors (SPM) and interior mounted permanent magnet synchronous motors (IPM). Saliency ratio is defined as the ratio of q- axis inductance to d- axis inductance. While SPMs with the same d- and q- axis inductance values have the capacity to generate only the magnet-based torque IPMs are salient machines and they also produce reluctance torque due to the difference in inductances. This study analyses the influence of the saliency ratio on the drive system efficiency and the torque production capability of salient machines. First, efficient torque control systems have been implemented and successfully achieved for two identical IPMs with only difference in saliency ratios. Then, tests were carried out on the drive systems for two IPMs. It has been validated by extensive simulation results that the torque production capacity and the efficiency of the drive system can be increased considerably if the saliency ratio can be increased at the stage of machine design.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Application of an Epidemic Model to Turkey Data and Stability Analysis for
           the COVID-19 Pandemic

    • Authors: Ömer Faruk GÖZÜKIZIL; Nejdet KÖKER
      Abstract: An epidemic disease caused by a new coronavirus has spread all over the world with a high rate of transmission. The main purpose of this article is to define an epidemic model for the Covid-19 pandemic, to apply it to Turkey's data and to interpret it. Accordingly, a SEIR model was created to calculate the infected population and the number of deaths caused by this epidemic, and the stability of the model was examined. Since all the parameters affecting the stability cannot be calculated clearly, it cannot be expected to reach a realistic result. For this reason, a model was created with accessible parameters. Later, the diseased and non diseased equilibrium points of the model were discussed. The Hurwitz theorem is used to find the local stability of the model, while the Lyaponov function theory is used to investigate its global stability. Finally, some numerical results are given with the help of MATLAB program.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Spectrophotometric Determination of Losartan Potassium and
           Hydrochlorothiazide in tablets by Wavelet Transform Approach

    • Authors: Özgür ÜSTÜNDAĞ; Erdal DİNÇ
      Abstract: A precise, rapid and simple spectrophotometric method development with continuous wavelet transform technique was described in this paper for the simultaneous determination of losartan potassium and hydrochlorothiazide in tablets. The continuous wavelet transform approach based on the application of Symlets5-CWT. If the original UV spectra of losartan potassium and hydrochlorothiazide are examined, it is seen that the spectra of these two substances strongly overlap. With the developed Symlets5-CWT method, the analysis was carried out successfully without any pre-separation process. The calibration equations were obtained at 247.7 nm for the losartan potassium determination and at 259.1 nm for the hydrochlorothiazide determination, respectively. The developed methods were tested in terms of validity and applicability.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Development and Validation of RP-HPLC Method for the Determination of
           Dexrabeprazole Sodium

    • Authors: Semra YILMAZER KESKİN; Ebru Nurdan ŞENTÜRK, Cihansel UNLU
      Abstract: A rapid and simple liquid chromatographic method was developed for the quantitative determination of dexrabeprazole sodium in the tablet dosage form. The reverse-phase chromatographic analysis was carried out by using a C-18 column. The acetonitrile-phosphate buffer mixture was used as the mobile phase. The obtained retention time was 4.33∓0.02 min. by using 50:50 (v:v) acetonitrile:phosphate buffer(pH 7) and 1.0 mL/min. flow rate. Quantification of the analyte was based on measuring the peaks areas at 272 nm. The analytical performance of the developed RP-HPLC method was validated with respect to accuracy, precision, linearity, stability, and robustness. The obtained linearity range was 77-143 mg/L and the correlation coefficient was 0.9989. The obtained LOD and LOQ values were 0.010 mg/L and 0.034 mg/L, respectively.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Experimental Study on Composite Floor Panels

    • Authors: Osman KAYA
      Abstract: This paper presents experimental investigations carried out on various composite floor deck panel systems. The effects of parameters such as concrete shear length, steel thickness, and concrete thickness on the shear and flexural behavior of panels were examined. Shear tests were carried out on identical specimens with four different shear span lengths. Four-point flexural tests were carried out on single-span and double-span specimens. Shear stress-slip, load-deformation, and moment-curvature behaviors were compared. From the test results, the effect of shear strength between the corrugated sheets and concrete governs the failure mechanisms of the flexural test, if there is no shear connector. In all flexural tests the failure is became due to the slippage between the steel panel and concrete.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • A Multi-task Deep Learning System for Face Detection and Age Group
           Classification for Masked Faces

    • Authors: Gozde YOLCU; İsmail ÖZTEL
      Abstract: COVID-19 is an ongoing pandemic and according to the experts, using a face mask can reduce the spread of the disease. On the other hand, masks cause occlusion in faces and can create safety problems such as the recognition of the face and the estimation of its age. To prevent the spread of COVID-19, some countries have restrictions according to age groups. Also in different countries, people in some age groups have safety restrictions such as driving and consuming alcohol, etc. But these rules are difficult to follow due to occlusion in faces. Automated systems can assist to monitor these rules. In this study, a deep learning-based automated multi-task face detection and age group classification system is proposed for masked faces. The system first detects masked/no-masked-faces. Then, it classifies them according to age-groups. It works for multi-person regardless of indoor/outdoor environment. The system achieved 79.0% precision score for masked face detection using Faster R-CNN with resnet50 network. Also, 83.87% accuracy for classifying age groups with masked faces and 84.48% accuracy for no-masked faces using densenet201 network have been observed. It produced better results compared to the literature. The results are significant because they show that a reliable age classification for masked faces is possible.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Reconfigurable and Resource Efficient Implementation of a Parallel FFT
           Core in FPGA

    • Authors: Dursun BARAN
      Abstract: Resource efficient implementation of a highly reconfigurable, parallel and pipelined FFT core that provides 1.2GS/s throughput rate with 24-bits wide input samples for the real-time spectrum analysis applications is developed and realized. Physical placement constraints are used to improve the timing performance of implemented design in FPGA. Some design techniques to reduce the memory complexities of design are also provided. Full implementation of the design is completed and implementation details are provided.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Enhancing the Out-of-Plane Compressive Performance of Lightweight Polymer
           Foam Core Sandwiches

    • Authors: Çağrı UZAY
      Abstract: This study investigates the flatwise compressive performance of the developed sandwiches with core stitching modification. Polyvinyl chloride (PVC) foam cores with a density of 0.048 g/cm3 were stitched with 600-tex glass fiber yarns. Then the core materials were sandwiched with carbon/epoxy and glass/epoxy face sheets, respectively. The composite sandwich structures were produced by applying the vacuum bag method, and the composite layers were co-cured. The non-stitched foam core sandwiches were also manufactured as the benchmark. The developed sandwich panels were subjected to flatwise compression tests per the ASTM C365 Standard to obtain compressive properties. The mechanical testing showed that the stitched foam core sandwiches carried dramatically higher compressive loads and presented additional load peaks. The increments in the compressive strength of the developed sandwich panels were found above 80% without a significant weight penalty. Core stitching, providing the sandwich panels to have better out-of-plane strength, is a simple and less time-consuming through-thickness reinforcement process among the other core modification methods.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • The Leaf and Stem Anatomy of Two Endemic Salvia (Section Salvia,
           Lamiaceae) from Turkey: S. aucheri subsp. canascens and S. heldrichiana

    • Authors: Gülnur EKŞİ; Gülderen YILMAZ
      Abstract: Salvia L. has a wide variety of traditional usages as digestive, appetizer, carminative, antiseptic, stimulant, pain reliever, antipyretic, diuretic, antitussive and for bronchitis, asthma and cold. Anatomical features are extremely important for the taxonomy of Salvia species, especially leaf and stem represent many specific characteristics. The aim of this study is to determine the distinctive anatomical structures of S. aucheri subsp. canascens (Boiss. & Heldr.) Celep, Kahraman & Doğan and S. heldreichiana Boiss. comparatively. The transverse-sections were taken from the leaf and stem to determine the anatomical features of two Salvia species. They differ in many anatomical characters like leaf type, which is bifacial and hypostomatic for S. aucheri subsp. canascens and monofacial and amphistomatic for S. heldreichiana. Besides, the leaf surfaces of both species are covered by different types of glandular trichomes. The midrib contains a big vascular bundle in S. aucheri subsp. canascens and has three big vascular bundles in S. heldreichiana. Additionally, the stem surface of S. aucheri subsp. canascens is glabrous while the stem is pilose in S. heldreichiana. In conclusion, our anatomical results were contributed to the taxonomy of S. aucheri subsp. canascens and S. heldreichiana and confirmed the importance of anatomy in the species level for the genus.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • A New Game Value Approach for Infinite Interval Matrix Games

    • Authors: Aykut OR; Gönül Selin SAVAŞKAN
      Abstract: The purpose of this paper is to determine when and under which conditions the solution and game value of the infinite interval matrix games will exist. Firstly, the concept of a reasonable solution defined in interval matrix games was extended to infinite interval matrix games. Then, the solution and game value were characterized by using sequences of interval numbers (defined by Chiao, 2002) and their concept of convergence of interval numbers. Considering that each row or column of the payoff matrix is a sequence of interval numbers, we assume that each row converges to the same interval number α ̃=[α_l,α_r] and each column to the same interval number β ̃=[β_l,β_r]. In a conclusion, the existence of the solution of G ̃ is shown.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Examination of Stability Analysis of Sakarya and Turkey Scale Alcohol Use
           Model

    • Authors: Recai TARAKÇI; Ömer Faruk GÖZÜKIZIL
      Abstract: This paper is devoted to studying the mathematical model of the alcohol-consuming population. For this purpose, the formulation of the model including the alcohol-consuming population is presented; then the balance points related to non-alcohol use and positive alcohol use are discussed. Hurwitz theorem is used to find the local stability of the model, and Lyapunov function theory is used to investigate the global stability. The same mathematical model with alcohol use is considered for Sakarya and Turkey, individual numerical results are presented, and stability analyzes are examined. Finally, using the numerical data, a simulation is made in Matlab with the Runge-Kutta fourth-order method.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Determination of Indoor Air Quality in University Student Canteens

    • Authors: Gülgün DEDE; Cemile DEDE
      Abstract: The negative effects of indoor air quality cause a decrease in the working efficiency of people, and health problems. For this reason, monitoring the indoor air quality of the places where students spend time such as canteen, cafeteria and library is important in terms of quality of life. Particulate matter is the leading source of pollutants affecting indoor air quality. For this purpose, the indoor air quality of student canteens in a public university located in Marmara Region, Turkey was examined in terms of temperature, relative humidity, person density, area, particulate matter (PM2.5 and PM10) parameters. The relative humidity in canteens was found to be within normal range in terms of comfort conditions, and the temperature was slightly higher depending on seasonal conditions and canteen conditions. It was observed that the density of people in canteens at certain hours affected PM2.5 and PM10 concentrations, and PM2.5 and PM10 concentrations increased with the increase in the number of students. It was determined that World Health Organization (WHO) limit values and air pollution regulation limit values were exceeded in canteens except E3 and A1 canteens. Due to the insufficient ventilation of the canteens, it was determined that particulate matter may pose a risk to the students and the employees of the canteen, and recommendations were made to improve the indoor air quality.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Electromagnetic Shielding Properties of Pack Borided MirraxTM Steel

    • Authors: İbrahim ALTINSOY
      Abstract: In this study, it was aimed to investigate the electromagnetic interference shielding (EMI-SE) as well as some physical and mechanical properties of pack borided Mirrax tool steel. Boriding process was carried out at 900, 950 and 1000°C for 2, 5,8h, respectively. Optical images showed that borides layer have smooth morphology and flat interface with matrix. XRD analysis revealed that main phases in the layer were FeB and Fe2B. Intensity of FeB phases increased with increment of process temperature and time. Depending on process time and temperature the thickness of borides layer was ranged from 10 mm to 87.80 um. Microhardness of layer was between 1700 and 2400 HV. EMI-SE measurements conducted within Ku band (12-20 GHz) indicated that EMI-SE efficiency increased by increasing of process time and temperature and it was ranged from 52dB to 75dB. It is possible to claim that borided Mirrax steel performed good EMI-SE and when boriding time reached to 5h, remarkable EMI-SE (electromagnetic interference shielding) (over 60dB) was observed on the sample borided even at 900°C.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Determination of Multiple Antibiotic Resistance Profiles of Enterococcus
           Species Isolated From Fermented Meat Products CConsumed in Ankara

    • Authors: Meryem Burcu KÜLAHCI; Sumru ÇITAK, Zehra ŞAHİN
      Abstract: The aim of this study was to determine the multiple antibiotic resistance profiles of Enterococcus spp. isolated from the fermented meat products consumed in Ankara, Turkey. A total of 134 Enterococcus spp. were isolated and identified from 80 fermented meat samples. The highest prevalence of enterococci in the fermented food samples was found in sucuk (a Turkish fermented sausage) samples (50%), followed by sausage (25.4%), pastirma (a Turkish dry-cured meat product) (18.6%), and salami, respectively. Of a total of 134 Enterococcus isolates, 110 (82.1%) were found to be resistant to one or more of the antibiotics tested. Although the highest resistance rate was seen against rifampicin (73.2%), streptomycin (36.5%) and erythromycin (20.2%), 28 (20.9%) of Enterococcus isolates were resistant to multiple antibiotics. The presence of multiple antibiotic resistant Enterococcus in foods of animal origin raises alarm because of the risk of carrying these bacteria to humans via the food chain.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Isolation and Identification of Listeria spp. from White Cheese Samples
           Presented for Consumption in Istanbul

    • Authors: Nil KAYA; Elif Özlem ARSLAN AYDOĞDU, Ayten KİMİRAN
      Abstract: In this study, 119 feta cheese samples taken from different vendors in Istanbul were examined for the presence of L. monocytogenes. Isolates were confirmed by PCR method using iap and hlyA primers, and the antibiotic susceptibility of the identified strains was performed by the Kirby-Bauer protocol. Seven Listeria spp. was isolated from three (% 2.52) of 119 cheese samples analyzed. The seven Listeria spp. obtained from these three samples were found to contain the iap gene region but not the hlyA gene region. As a result of the sequence analysis using the 16S rRNA gene region, it was determined that these isolates were L. seeligeri. As a result of antibiotic susceptibility tests, it was observed that L. seeligeri isolates were showed ciprofloxacin (% 85.71) and penicillin (% 42.85) resistance. All strains were susceptible to amikacin, amoxicillin/clavulanic acid, chloramphenicol, rifampin, gentamicin, cefaclor, ampicillin, trimethoprim-sulfamethoxazole, tetracycline, vancomycin, and clarithromycin antibiotics. The detection of Listeria bacteria in feta cheese samples made with pasteurized milk revealed that packaging, distribution, and storage practices following the pasteurization process should be followed more strictly. It is recommended to apply controls at each stage to prevent contamination.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • The Effect of Derived Features on Art Genre Classification with Machine
           Learning

    • Authors: Didem ABİDİN
      Abstract: Classification of the artwork according to their genres is being done for years. Although this process was used to be done by art experts before, now artificial intelligence techniques may help people manage this classification task. The algorithms used for classification are already improved, and now they can make classifications and predictions for any kind of genre classification. In this study, two different machine learning algorithms are used on an artwork dataset for genre classification. The primary purpose of this study is to show that the derived features about the artwork have a remarkable effect on correct genre classification. These features are derived from the metadata of the dataset. This metadata contains information about the nationalities and the period that the artist lived. Image filters are also applied to the images but the results show that applying only image filters on the dataset used in the study did not perform well. Instead, adding derived features extracted from the metadata increased the classification performances dramatically.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
  • Numerical Assessment of Symmetric and Non-Symmetric Kernel Functions on
           Second Order Non-Homogenous Volterra Integro-Differential Equations

    • Authors: Falade IYANDA; Baoku ISMAEL, Tiamiyu ABDULGAFAR
      Abstract: In this paper, we present numerical assessment of symmetric and non-symmetric kernel functions on non-homogenous Volterra integro-differential equations. Simple MAPLE 18 software commands codes procedures are employ based on newly introduced techniques: exponentially fitted collocation approximation method and Adomian decomposition method for the numerical solutions of the non-homogenous Volterra integro-differential equations. The procedures are sought to obtain convergent point of the problems. Considering the property of symmetric and non-symmetric kernel ( Kt,s=Ks,t and Kt,s≠Ks,t ), the computational lengths are considered to archive the best numerical solutions for the four examples considered. The reliability and efficiency of the proposed techniques are demonstrated using some examples available in literature.
      PubDate: Fri, 31 Dec 2021 00:00:00 +030
       
 
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