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RISS 인기검색어
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- 저자 : Bidadi, Sanam (검색결과 3 건)
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Temperature dependent electrophysical characteristics of GaAs-polymer composite varistors
H. Bidadi,Mohammadi Aref,M. Ghafouri,M. Parhizkar,A. Olad 한국물리학회 2013 Current Applied Physics Vol.13 No.2
A composition of GaAs-polymer tiny particles was pressed at a temperature of 130 C and a pressure of 60 MPa and its currentevoltage characteristic was studied. The result shows that the prepared disk has varistor behavior and can therefore be used to protect circuits from low overvoltage transients higher than 62 V. Temperature dependence of current-voltage characteristic and the electrical conductivity of the sample were investigated in the temperature range of 25e100 C. It has been found that increase in temperature results in lower breakdown voltage and nonlinearity coefficient. At high temperatures, nonlinearity in the IeV characteristic of sample disappears and the conductivity becomes Ohmic in nature. The sample has hysteresis which decreases through increase in temperature. Annealing effect on leakage current and breakdown voltage was both investigated and analyzed using SEM micrographs. Finally, the electrical bandgap of the sample was measured.
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Reza Jalali,Mojtaba Parhizkar,Hasan Bidadi,Hamid Naghshara,Seyd Reza Hosseini,Majid Jafari 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.6
TiAlN thin films were deposited by using the reactive magnetron co-sputtering method whitindividual Ti and Al targets, where the Ti and the Al targets were simultaneously powered by usingDC and RF sources, respectively. the electrical resistivity and the structural and microstructuralproperties of the deposited TiAlN thin films and the effects of Al content, substrate temperatureand nitrogen gas flow rate on those properties were investigated. At a low flow rate of nitrogen gas(0.51 sccm), the electrical resistivity of the films was found to increase with increasing AC power,but at a high flow rate of nitrogen gas, it was found to decrease. The structural and microstructuralanalyses performed by using X-ray diffraction and scanning electron microscopy (SEM) showed thatwith increasing substrate temperature from room temperature to 400◦C, the films prepared at 400◦C have a crystalline structure while those prepared at room temperature had an amorphous nature. Also, the SEM analysis revealed that with decreasing AC power and increasing nitrogen flow rate,the size of the grains in the prepared films become larger.
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Antiproliferative Effect of Metformin on the Endometrium - a Clinical Trial
Tabrizi, Ali Dastranj,Melli, Manijeh Sayyah,Foroughi, Meraj,Ghojazadeh, Morteza,Bidadi, Sanam Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.23
Background: Unopposed estrogen has a central role in development of endometrial benign, premalignant and malignant lesions. The aim of this study was to evaluate the anti-estrogenic effect of metformin on endometrial histology in comparison with progesterone. Materials and Methods: A total of 43 patients who were referred to our center for abnormal uterine bleeding and had a histologic diagnosis were disordered proliferative endometrium or simple endometrial hyperplasia were included and randomly distributed in two groups treated with metformin (500mg Bid) or megestrol (40mg daily), respectively, for three months. After this period the patients were evaluated by another endometrial biopsy to assess the impact of the two drugs in restoring normal endometrial histology. Results: Our findings revealed that metformin could induce endometrial atrophy in 21 out of 22 patients (95.5%) while this positive response was achieved in only 13 out of 21 patients (61.9%) in the megstrol group. In addition two low grade endometrial carcinomas in the metformin group responded very well. Conclusions: We conclude that metformin could be used as an effective antiestrogenic agent in control of abnormal endometrial proliferative disorders.
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