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Öğe Predicting factors affecting PISA 2015 mathematics literacy via radial basis function artificial neural network(Batman Üniversitesi, 2019-05-23) Güre Bezek, Özlem; Kayri, Murat; Erdoğan, FevziIn this study, radial basis function artificial neural network (RBFN), which is one of the of data mining methods, was employed to determine the factors affecting PISA 2015 (Programme for International Student Assessment - PISA), Mathematics literacy. Mathematics literacy scores, which were made in categorical form with three level dependent variables, 25 independent variables, and considered to have affected the dependent variables, were employed in evaluating and validating the proposed method. Also, in order to determine factors affecting PISA 2015 Mathematics literacy, information obtained from a total of 4422 students (2165 (49%) of whom were males and 2257 (51%) of whom were females) who participated the exam was used. According to the obtained results, the correct classification rate of mathematics achievement in the radial based artificial neural network model was found to be 85.2%. In addition, it is seen that the most important factor that were affecting Mathematics literacy was Turkish language success status and the other variables that were setting significance are targeted point in school life, father education level and mother education level.Öğe Design, preparation and application of a Pirkle-type chiral stationary phase for enantioseparation of some racemic organic acids and molecular dynamics studies(ACG Publications, 2017-11) Çakmak, Reşit; Ercan, Selami; Sünkür, Murat; Yılmaz, Hayrullah; Topal, GirayThis study consists of two parts. In the first part of the study; a Pirkle-type chiral stationary phase was prepared by synthesizing an aromatic amine derivative of (R)-2-amino-1-butanol as a chiral selector and binding to L-tyrosine-modified cyanogen bromide (CNBr)-activated Sepharose 4B and then, packed into the separation column. The chromatographic performance of the separation column was evaluated with racemic mandelic acid and 2-phenylpropionic acid by using phosphate buffers at three different pHs as mobile phase. In the resolution processes, the prepared solutions were loaded onto the separation column at two different concentrations and at three different pHs for each racemic organic acid, separately. Enantiomeric excess (ee%) of the eluates was determined on CHIRALPAK AD-H chiral analytical column by HPLC. The maximum ee% for mandelic acid and 2-phenylpropionic acid was determined to be 60.84 and 27.4, respectively. Separation factors (k1 ’ , k2 ’ , α, and Rs) were calculated for each acid. The structures of the obtained compounds were characterized using the spectroscopic methods (NMR, and elemental analysis). In the second part of the study; enantioselective interactions between the prepared CSP and the analytes have been widely studied by docking, molecular dynamics simulation and quantum mechanical computation methods. The reason of column eluation of rac-2-phenylpropionic acid with lower enantiomeric yield was explained by these techniques.Öğe The methods used in histopathological evaluation of testis tissues(Batman Üniversitesi, 2020-06-30) Yalçın, Tuba; Kaya, Sercan; Kaya Tektemur, Nalan; Ozan, İ. EnverThe quantitative measurements are numerical data as the outputs of various processes. Statistical analysis is employed to the collected data. Results obtained from the statistical data are considered as more reliable. Therefore, measurement processes are the basis of research sciences today. Histology is a discipline that examines the microscopic structure of cells and tissues. Morphometric measurements can be performed on cell and tissue samples through electron and light microscope. In the PubMed search engine, MEDLINE, SCIENCE DIRECT and Web of Science, Springer Link, and Ovid were scanned for the words “Testis, histopathology, quantitative, seminiferous tubule”. The findings obtained through these qualitative methods provide interpretation of the changes in tissue morphology. These assessments allow researchers to identify the tissue samples and to compare the physiological variations in its morphology. In histology, the results obtained from routine dyeing of laboratory studies are qualitative, therefore, relative differences may emerge in the interpretation of the results. In order to eliminate this risk, various quantitative measurement methods are implemented. Today, in order to employ accurate evaluations, the histometric and stereological measurement methods that are used in organs such as testicles, liver, lung, and kidney gain importance. The quantitative data obtained from these transactions is sufficient for statistical analysis. It is also important to reach a certain standardization level in the repetition of qualitative or semi-quantitative data obtained during the statistical analyses. The aim of this study is to summarize the methods used in histopathological evaluation of testicular tissues.Öğe Organik arayüzey tabakalı Al/CuPc /p-InP kontakların fabrikasyonu ve elektriksel parametrelerinin incelenmesi(Batman Üniversitesi, 2015-07-01) Aslan, Filiz; Güllü, Ömer; Ocak, Yusuf Selim; Rüzgar, Şerif; Tombak, Ahmet; Özaydın, Cihat; Pakma, Osman; Arsel, İsmailBu çalışmada termal buharlaştırma metodu kullanılarak bakır fitalosiyanin (CuPc) p-InP kristali üzerine kaplandı. Yine termal buharlaştırma sistemi kullanılarak oluşan ince organik film üzerine vakum ortamında alüminyum metali kaplandı ve Al/CuPc/p-InP diyot yapısı oluşturuldu. Al/CuPc/p-InP diyotunun oda sıcaklığında, karanlık ve aydınlık ortamda akım-gerilim (I-V) ölçümleri alındı. I-V grafiğinden bu yapının doğrultucu özellik gösterdiği görüldü. Aydınlık ortamda yapılan ölçümler 100 mW/cm2 ışık şiddeti altında yapıldı ve bu ölçümler doğrultusunda diyotun fotodiyot özellik gösterdiği görüldü. Ayrıca farklı yöntemlerle Al/CuPc/p-InP Schottky diyotunun karakteristik parametreleri ( idealite faktörü (n) ,engel yüksekliği (Φb) ve seri direnç (Rs) ) hesaplandı.
