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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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International Journal of Computational and Experimental Science and Engineering (IJCESEN)
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2149-9144
Published by DergiPark Homepage  [187 journals]
  • Modeling of a Tandem Solar Cell Structure Based on CZTS and CZTSe Absorber

    • Authors: Hayat ARBOUZ
      Abstract: In this paper, we simulated a double junction cell based on top CdS/Cu2ZnSnS4 cell, stacked on a bottom CdS/Cu2ZnSnSe4 cell. We started by studying the perfomance of the bottom solar cell, based on the copper zinc tin selenide Cu2ZnSnSe4 (CZTSe) absorber. Then, we evaluated the photovoltaic parameters of the tandem cell at the optimized thickness of the copper zinc tin sulfide Cu2ZnSnS4 (CZTS) absorber of the top cell, where the top and bottom cells deliver the same photocurrent density. We achieved A maximum efficiency of 24.68% with an open circuit voltage of 1.33 V and a photocurrent density of 16.54 mA/cm² for the thicknesses 413.8 nm and 2 µm of CZTS and CZTSe absorbers, respectively. İn order to improve power conversion efficiency, light trapping effects was studied. The use of randomly textured top cell absorber allows the reduction of its thickness to 270 nm. An efficiency of 24.71% was then obtained. Finally, the effect of replacing the toxic CdS buffer absorber with the ZnS material was investigated.
      PubDate: Thu, 31 Mar 2022 00:00:00 +030
  • The Effect of Circadian Blood Pressure in The Development of Lacunar
           Infarcts, Together with Other Possible Factors

    • Authors: Gökhan KESKİN; Abdulkadir ÇAKMAK
      Abstract: This study was carried out in Amasya University S.S.R.E. Hospital Department of Neurology and Cardiology between 2021 and 2022. Total number of 58 patients (29 lacunar infarct patients and 29 control subjects, 42 females and 16 males) over the age of 45 (mean age 57.1+-6.8) were recruited to the study. All patients underwent 24-hour blood pressure monitoring. The patients with a history of stroke, malignancy, renal or endocrinal disease were excluded from the study. According to the systolic blood pressure measurements, twenty-seven patients were ‘non-Dipper’ and thirty-one patients were ‘Dipper’. Diastolic blood pressure measurements revealed that twenty-one patients were ‘non-Dipper’ and thirty-seven patients were ‘Dipper’.Mean daytime and night-time systolic blood pressure values were higher in patients with lacunar infarction (p:0.02). There was no difference in the diastolic BP and variability (p > 0,05). The clinical importance of the alteration in the reduction of blood pressure is still controversial. Understanding the alterations in blood pressure rhythmicity will be helpful to prevent and treat the lacunar infarctions.
      PubDate: Thu, 31 Mar 2022 00:00:00 +030
  • Modern Nanotechnology Application for Generation Highly Efficient
           Electricity in Save Mode and Much Less Polluting

    • Authors: Mohammed Flayyih HASAN; Merdin DANIŞMAZ, Faez WAHEED
      Abstract: Most world country dependent on foreign oil to make things working, which means political disputes or any disputes between countries can result in energy crunches. The negative changes that occur in the global climate and environment due to the burning of fossil fuels, stimulate the search for modern and environmentally friendly sources of energy production. In addition, continued concern about the storage and processing of nuclear waste may limit nuclear energy options. New concepts use nanotechnology as a new application for production of the electricity. In the modern thin-film application technologies, a number of layers can be deposited to improve the cells' energy density, reduce operating temperatures, and lower manufacturing costs. Solid oxide fuel cells (SOFCs), which have the ability to convert chemical energy into electrical energy without combustion, are among the advantages of this cell; High efficiency and much less pollution. Fuel cells - zinc, air, proton exchange membranes, and solid oxide are recent and established energy applications. Several of these solid oxide fuel cells (SOFCs) have emerged as fuel cell technology that has additional positive advantages.
      PubDate: Thu, 31 Mar 2022 00:00:00 +030
  • Evaluation of Ergonomic Conditions using Fuzzy Logic in a Metal Processing

    • Authors: Tuğçe CAYMAZ; Sümeyye ÇALIŞKAN, Ahmet Reha BOTSALI
      Abstract: Ergonomic conditions of workplace settings is important for the performance of companies. Especially in the manufacturing industry, the employees are required to have convenient workplace conditions. If this is not the case, it is most likely to have a decrease in work efficiency, increase in workload, and negative impacts on employee health. In this study, we evaluate two ergonomic conditions, illumination and noise level, in different departments of a metal processing plant, to find the initial department to work on the improvement of ergonomic conditions. The evaluation of ergonomic conditions is done through a fuzzification process. The quantitative measurement results of illumination and noise level are fuzzified by Mamdani method. The fuzzified measurement values are scored with respect to specified interval lengths. As a result of this scoring process, ergonomically the worst conditioned department is found to start the improvement process.
      PubDate: Thu, 31 Mar 2022 00:00:00 +030
  • Simulation of Neutrons Shielding Properties for Some Medical Materials

    • Authors: Faez WAHEED; Meltem İMAMOĞLU, Nurdan KARPUZ, Hüseyin OVALIOĞLU
      Abstract: Radiation is used different field and among others neutron is the one of the most hazardous particle as it is neutral and heavy. Its neutral characteristics make it more difficult particle to be shielded. In this study neutron shielding properties for some medical interested materials of water, fat and bone have been obtained using Phy-X/PSD software.
      PubDate: Thu, 31 Mar 2022 00:00:00 +030
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