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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Middle East Journal of Science
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2618-6136
Published by DergiPark Homepage  [185 journals]
  • SIMULATION STUDIES OF CR DOPED CUO HETEROJUNCTION SOLAR CELL

    • Authors: Serap YİĞİT GEZGİN; Şilan BATURAY, İlhan CANDAN, Hamdi Şükür KILIÇ
      Abstract: 1% and 3% Cr doped CuO thin films have been deposited on soda lime glass by spin coating method and then their structural, morphological and optical properties have been investigated by operating X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet-Visible Spectroscopy (UV-Vis) techniques, respectively. XRD patterns of CuO:Cr (1%) and CuO:Cr (3%) thin films demonstrate characteristics of monoclinic CuO structure with a C2/c space group. The morphology of coated film plays an important role in analyzing some optoelectronic properties. 1% Cr doped CuO thin film absorbs more photons compared to 3% Cr doped CuO in Vis and UV regions. The band gaps of 1% Cr and 3% Cr doped CuO thin films are to be 2.18 eV and 2.30 eV, respectively. The Mo/1% and 3% Cr doped CuO/n-ZnO/i-ZnO/AZO solar cell has modelled with SCAPS-1D simulation program. The photovoltaic (PV) parameters of solar cell deteriorated with some increase in the neutral defect density (N_t) value. As the shallow acceptor defect density (N_a) value is increased, J_SC is decreased, V_OC, FF and η are increased. PV performance of 1% Cr doped CuO solar cell were found to be better than that of 3% Cr doped CuO solar cell. The efficiency of 1% Cr doped CuO solar cell is increased with the use of SnO2 intermediate layer in 2 nm thickness at the heterojunction interface.
      PubDate: Fri, 29 Dec 2023 00:00:00 +030
       
  • INVESTIGATION OF CENTERING PROBLEM IN THE CADMIUM ZINC TELLURIDE (CZT)
           CARDIAC CAMERA

    • Authors: Eda MUTLU; Bilal KOVAN, Emine Göknur IŞIK, Serkan KUYUMCU, Bayram DEMİR
      Abstract: Introduction: Cadmium Zinc Telluride (CZT) Cardiac Cameras are a special SPECT cameras with solid state cadmium zinc telluride detectors. This diagnostic method applied in the evaluation of coronary artery disease is well designed for myocardial perfusion scintigraphy. Aim: CZT cardiac cameras have limited detector area. In patients who are morbidly obese or whose heart is not in its normal location in the body, the center of the heart and the isocenter of the device do not coincide. It is aim to investigate how these conditions affect the imaging performance of the CZT cardiac camera. Methods: A homogeneous and spherical ball with a diameter of 4 cm was used for the research. To be able to measure away from the center a wooden phantom with 8 cavities and a total length of 32 cm was designed. The center as reference point has been determined by matching the center of the device with the center of the sphere. For the next imaging, the image were taken by placing the spherical ball in the other cavities, respectively, without changing the center. Results: According to the results obtained, farther from the center, deviations from sphericity and differences in dose distribution were observed. Counts decreased by 1.5% in the 2nd position and 16% in the 3rd position relative to the center in the X-axis. A disaster area has been formed and the image area has been exited from the 4th imaging. Conclusion: It is very important to center the patient as much as possible, otherwise the doctor will misdiagnose.
      PubDate: Fri, 29 Dec 2023 00:00:00 +030
       
  • SPERM PARAMETERS' PREDICTIVE VALUE IN INTRAUTERINE INSEMINATION SUCCESS: A
           SINGLE-CENTER EXPERIENCE

    • Authors: Muhamet AFŞİN; Ayşe Feyda NURSAL, Serap Mutlu ÖZÇELİK OTCU, Dilek YAVUZ, Serhat EGE
      Abstract: Although intrauterine insemination is a widely used assisted reproductive technique there is no consensus on sperm parameters that affect the probability of pregnancy. Therefore, the purpose of this study was to determine whether semen parameters affect intrauterine insemination success. A total of 403 couples (345 negative pregnancies, and 58 positive pregnancy) that underwent 549 intrauterine insemination treatment cycles for heterogenous indications were included in the study. Clomiphen citrate, letrazole and/or gonadotropins were used for ovarian stimulation in women in this study. The spermiogram tests of the spouse of receiving IUI tretment were examined. Clinical pregnancy occurred in 58 of 549 intrauterine insemination (10.56%). Unexplained infertility, polycystic ovary syndrome, and cervical-tubal factors were higher in positive pregnancy group compared to negative pregnancy group while male factor was more prevalant in negative pregnancy group comparison to positive pregnancy group (p=0.03). There was no statistical difference between women with positive and negative pregnancy in terms of age (≤ 35 and > 35), body mass index, infertility type, infertility time, endometrial thickness on HCG day, stimulation protocol, cycle numbers, number of insemination, estradiol, prolactin, LH, FSH, and TSH levels (p>0.05). The sperm characteristics in males [ejaculate volum, sperm concentration, total sperm count, motility, immotility, and total progressive motile sperm count] did not significantly differed between positive and negative pregnancy groups (p>0.05).Briefly, the present study found that the conception probability of intrauterine insemination did not correlate with the spermiogram parameters.
      PubDate: Fri, 29 Dec 2023 00:00:00 +030
       
  • ON ρ-STATISTICAL CONVERGENCE OF ORDER (α,β) FOR SEQUENCES
           OF FUZZY NUMBERS

    • Authors: Damla BARLAK
      Abstract: In this study, we first give the definition of ρ-statistical convergence of order (α,β) for sequences of fuzzy numbers. We also define the strongly w(ρ,F,q)-summable of order (α,β) and the strongly w(ρ,F,q,f)-summable of order (α,β), defined by a modulus function f for sequences of fuzzy numbers. Later we give some coverage theorems between these sets and the set S_α^β (ρ,F).
      PubDate: Fri, 29 Dec 2023 00:00:00 +030
       
  • A LAGRANGE NEURAL NETWORK FOR NETWORK TRAFFIC ASSIGNMENT OPTIMIZATION

    • Authors: Hasan DALMAN
      Abstract: This study considers a nonlinear optimization problem used to achieve user equilibrium in the network traffic assignment problem. By providing the Karush Kuhn Tucker conditions of this optimization problem, it is converted into a system of differential equations using the Lagrange function. This system is then redefined as a Lagrange neural network, which is proven to be asymptotically and lyapunov stable. Finally, a numerical method are used to demonstrate that the results obtained from this neural network are a solution to the optimization problem and converge to user equilibrium.
      PubDate: Fri, 29 Dec 2023 00:00:00 +030
       
 
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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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