Toktas A.,Karamanoglu Mehmetbey University
IET Microwaves, Antennas and Propagation | Year: 2017
Low-profile band-notched G-shaped ultra-wideband (UWB) multiple input multiple output (MIMO) antenna design for mobile terminals has been presented. In this context, two UWB MIMO antenna systems have been designed: The first is with square elements and the second is with G-shaped elements. An MIMO antenna with two symmetrical square elements each of 8 × 8 mm2 operating between 2.2 and 13.3 GHz was firstly designed for the UWB applications. Each square element was fed through a 50-Ω microstrip transmission line (MTL). A thin strip line was designed at the end of MTL to provide impedance matching. Although the isolation level between the elements was satisfactory for efficient MIMO implementation, a T-shaped strip on the ground was employed to further improve the isolation for low frequency. The frequency range of 4.4-6.2 GHz which is an important band of wireless local area network (WLAN) standard was then notched by forming a G-shaped structure on the square element. The performance of G-shaped antenna system was studied in terms of important antenna characteristics and MIMO parameters. The results demonstrate that the G-shaped MIMO antenna has nearly omnidirectional patterns, stable gain and good diversity performance besides having low-profile elements. © 2016. The Institution of Engineering and Technology.
Sadi O.,Karamanoglu Mehmetbey University
International Journal of Environmental and Science Education | Year: 2015
The purpose of this study is to investigate whether or not conceptions of learning diverge in different science domains by identifying high school students’ conceptions of learning in physics, chemistry and biology. The Conceptions of Learning Science (COLS) questionnaire was adapted for physics (Conceptions of Learning Physics, COLP), chemistry (Conceptions of Learning Chemistry, COLC) and biology (Conceptions of Learning Biology, COLB) firstly and they were separately administered to 361 high school students at the same time. The factor structures of each questionnaire were also analyzed by exploratory factor analysis. The differences between students’ conceptions of learning in each questionnaire factors of all three domains were analyzed with paired-samples t-test. The results indicated differences in high school students’ conceptions of learning physics, chemistry and biology which were identified for all seven factors except application. In general sense, it was found that students preferred higher-level conceptions of learning biology more when compared with physics and chemistry domains. Possible implications about how students prefer to view learning from a higher-level perspective rather than a lower-level perspective, especially the ones with a high mean score in physics and chemistry (such as memorizing, preparing for exam and calculating and practicing) are discussed. © 2015 by iSER, International Society of Educational Research.
Sonmezoglu S.,Karamanoglu Mehmetbey University
Applied Physics Express | Year: 2011
The present work reports the fabrication and detailed electrical properties of n-TiO2/p-ZnO heterojunction diode. We have determined the electrical characteristics of the device such as current-voltage (I-V) and capacitance-voltage (C-V) at room temperature. This structure showed a good rectifying behavior with a typical ideality factor of 3.62, which was considered high due to the current mechanism and large defect density at the interface. The possible conduction mechanism of the heterojunction diode was determined by analyzing the I-V characteristics. The obtained results show that the n-TiO 2/p-ZnO heterojunction diode is an excellent candidate for semiconductor device applications. © 2011 The Japan Society of Applied Physics.
Yalcin H.,Karamanoglu Mehmetbey University
Cocuk Sagligi ve Hastaliklari Dergisi | Year: 2012
This research was planned to describe the traditional practices related to pregnancy, childbirth, puerperality, and child care among women in Karaman and the relation with sociodemographic characteristics. Women who gave birth at least once and who belonged to a low sociocultural level constituted this research basis, in which a screening model was used. An interview form was prepared according to literature information and was conducted face-to-face (N=195). Data were analyzed with arithmetic average, and significance of a contrast point between traditional practices according to sociocultural characteristics was analyzed with t-test. Of the women who contributed to this research, 76.4% of them stated that women who cannot have a baby are "massaged on the middle back" by traditional midwives in order to have a baby, 77.9% stated that an herb (Fatma Ana Eli) can be used to ease childbirth, 75.8% stated that a red-colored syrup (bogard) can be used to ease childbirth, 64.1% stated that the baby and mother should not be left alone for 40 days, 58.9% stated that the babies were "salted", and 66.1% stated that the baby's legs were swaddled for obtaining normal shape. In light of the research results, constant and regular educational courses for women related to inappropriate traditional practices are suggested.
Aasim M.,Karamanoglu Mehmetbey University
Pakistan Journal of Agricultural Sciences | Year: 2012
Lentil is highly recalcitrant and is difficult to regenerate through tissue culture. The study is aimed to overcome this problem by developing an efficient regeneration system using immature plumular apice explants from immature zygotic embryos of Turkish lentil cv. Ciftci. The results showed that 10 mg/l BA pulse treatment of explants for 10 days followed by culture on MS medium containing various concentrations of BA-IBA supplemented with activated charcoal and PVP affected shoot regeneration frequency, mean number of shoots per explant and shoot length. Irrespective of the pulse treatment, combination of BA with IBA in MS medium promoted longer shoots compared to any concentration of BA alone. Maximum number of shoots (4.25) per explant was recorded on MS medium containing 0.25 mg/l BA + 0.1 mg/l IBA after pulse treatment. The longest shoots (6.17 cm) were recorded in pulse treated explants when cultured on MS medium containing 0.25 mg/l BA + 0.1 mg/l IBA. The regenerated shoots were rooted on MS medium containing 0.25 to 1 mg/l IBA or 1 mg/l IAA. The rooted plants were acclimatized at 24±2°C in the growth room where, they flowered and set seeds.
Sonmezoglu S.,Karamanoglu Mehmetbey University
Current Nanoscience | Year: 2013
In the present study, using sol-gel method titanium dioxide (TiO2) nanoparticles with a new doping material have been synthesized, and a Dodecyl Benzene Sulfonic Acid (DBSA)-doped TiO2/p-Si Metal-Oxide-Semiconductor (MOS) structure has been fabricated. The characterizations of the structural and morphological properties of the DBSA-doped TiO2 nanoparticles have been carried out by means of X-Ray Diffraction (XRD) and Atomic Force Microscopy (AFM), respectively. The XRD results show that DBSA-doped TiO2 have a crystalline rutile phase along the (110) growth direction. It was confirmed from AFM images that the nanostructure of DBSA-doped TiO2 is grown as rock-like. The electrical characteristics of the device have also been performed, including current-voltage (I-V) and capacitance-voltage (C-V) at room temperature. © 2013 Bentham Science Publishers.
Akman E.,Karamanoglu Mehmetbey University
Applied Surface Science | Year: 2014
This investigation addressed the structural, optical and morphological properties of tellurium incorporated zinc oxide (Te-ZnO) thin films. The obtained results indicated that Te-doped ZnO thin films exhibit an enhancement of band gap energy and crystallinity compared with non-doped films. The optical transmission spectra revealed a shift in the absorption edge toward lower wavelengths. X-ray diffraction measurement demonstrated that the film was crystallized in the hexagonal (wurtzite) phase and presented a preferential orientation along the c-axis. The XRD obtained patterns indicate that the crystallite size of the thin films, ranging from 23.9 to 49.1 nm, changed with the Te doping level. The scanning electron microscopy and atomic force microscopy results demonstrated that the grain size and surface roughness of the thin films increased as the Te concentration increased. Most significantly, we demonstrate that it is possible to control the structural, optical and morphological properties of ZnO thin films with the isoelectronic Te-incorporation level. © 2014 Elsevier B.V. All rights reserved.
Yildiz M.,Karamanoglu Mehmetbey University
Acta Physica Polonica A | Year: 2013
Atomic lifetimes and energy levels were calculated using weakest bound potential model theory for 5s2ns 2S1=2 (n6), 5s2np 2P0 1=2 (n ≥ 5), 5s2np 2P0 3=2 (n ≥ 5), 5s2nd 2D0 3=2 (n ≥ 5), 5s2nd 2D0 5=2 (n ≥ 5) series of the Rydberg states in neutral indium. The use of the quantum defect method and Martin's expression allowed us to supply lifetime values along by means of the series above. Some lifetimes and energy values not existing in the literature for high Rydberg states in neutral indium atom were obtained using this method. Our results nicely agree with the available experimental results and theoretical results.
Kaya A.,Karamanoglu Mehmetbey University
Turkish Journal of Botany | Year: 2015
This study was carried out on macrofungi samples collected from Atatürk Dam Lake basin, especially from the southern coasts, within the boundaries of Şanlıurfa province between 2003 and 2013. A total of 122 taxa belonging to 38 families were identified. Six of them are new for the mycobiota of Turkey. Sowerbyella rhenana (Fuckel) J. Moravec is new at the genus level, while Peziza pseudoviolacea Donadini, Peziza ripensis E.C. Hansen, Cheilymenia theleboloides (Alb. & Schwein.) Boud., Galeropsis desertorum Velen. & Dvořák, and Tulostoma melanocyclum Bres. are new at species level. © TÜBİTAK.
Sonmezoglu S.,Karamanoglu Mehmetbey University
Materials Technology | Year: 2014
TiO2-Te:CdO compound thin films were successfully synthesised and deposited on glass substrates by the sol-gel method. The compound oxide thin films were obtained from the mixture of the precursor solutions of Te doped CdO and TiO2. The microstructure and surface analysis of these compound thin films were investigated by using X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FESEM). The XRD results show that TiO2, Te:CdO, and the compound TiO2-Te:CdO thin films exhibite the tetragonal structure of the anatase phase, monoclinic CdTeO3 structure, and rhombohedral structure, respectively. The values of the crystallite size were obtained from the both Scherrer equation and Williamson-Hall plot. FESEM analysis shows well crystallised nanostructures morphology with a diameter ranging from 25 to 30 nm. Ultraviolet visible (UV-vis) Spectrometry was applied to determine the basic optical parameters such as transparency, optical band gaps and refractive indices of the all thin films. The optical band gaps of the TiO2, Te:CdO and TiO2-Te:CdO compound thin films were obtained to be 3?65, 2?90 and 3?47 eV respectively. © 2014 W. S. Maney & Son Ltd.