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Öğe A Research on the Problems, Tendencies and Social Structure of Students of Agricultural Faculties(Univ Namik Kemal, 2006) Demir, A.; Pala, A.; Baytekin, H.Social statues, tendencies and plans of students of agricultural faculties were investigated by a survey that had 21 multiple choice and 16 fill in the blanks questions. Only 10 out of 20 Faculties of Agriculture permitted the survey. The surveys were mailed to the universities and the completed 1845 survey forms were received by mail, between March 1st and May 15th, 2005. The data were analyzed using SAS V8.2 and odd ratios were calculated. According to the survey results, 64% of the students were from cities. 87% of the students stated that the education should emphasize the application more. This is because most of the students from cities are not exposed to agricultural practices. 72% of the students fear that they will be unemployed for a long time after graduation. The reason seems to be the excessive number of agriculture engineers and the negative public view on graduates of Faculty of Agriculture. Students who plan to work in private industry believed more in the benefits of education and followed the agricultural publications more closely compared to those who plan to work in a government office or to those who believe they will be unemployed for a long time (P< 0.01). Among the participants, only 6 % referred to agriculture as their ideal profession.Öğe Histopathology of ipsilateral and contralateral ovaries and plasma interleukin 6 levels after unilateral ovarian torsion(Imr Press, 2016) Karakoc-Sokmensuer, L.; Hacivelioglu, S.; Demir, A.; Koese, M.; Kaymaz, F. F.; Cakir, D. U.; Bozdag, G.Objective: The aim of the present study was to evaluate the time-dependent histopathologic changes in both ovaries and to determine the time-dependent levels of plasma interleukin 6 (IL-6) after unilateral ovarian torsion. Materials and Methods: An experimental animal study included 48 female Sprague-Dawley rats which were distributed to six groups: control group (Group 1), sham-operated control group (Group 2), and four unilateral ovarian torsion groups with torsion duration of three, six, 12, and 24 hours (Group 3, 4, 5, and 6, respectively). Histopathologic criteria (follicular degeneration, vascular congestion, hemorrhage, inflammatory cell infiltration, and total tissue damage score) were evaluated in both ovaries, and plasma IL-6 levels were measured. Results: At 24 hours after torsion began, mean total tissue damage score was similar between ovaries that had torsion and contralateral ovaries. Mean plasma IL-6 level did not change during the 24 hours after torsion began (p = 0.584). Conclusions: In addition to ovaries that had torsion, histopathologic abnormalities also occurred in contralateral ovaries. These results suggest that contralateral ovaries are not quiescent after unilateral ovarian torsion. Plasma IL-6 levels did not change significantly during the 24 hours after ovarian torsion began, resulting in a limitation of its diagnostic use in the early course of the disease.Öğe Simulation of Ni-like and Co-like X-rays emitted from laser produced tin plasmas(Inst Physics Acad Sci Czech Republic, 2006) Atalay, B.; Aydin, R.; Demir, A.; Kenar, N.; Kacar, E.The Ni-like and Co-like X-rays emitted from laser produced Tin plasmas generated using the 1.06 mu m, 1.2 ns pulses from a Nd-YAG laser were modelled. The modelling includes the Ni-like and Co-like X-ray resonance line spectrum emitted from Sn plasma between 12 angstrom - 25 angstrom and also free-free and free-bound continuous spectrum emitted from the Zn-, Cu-, Ni-, Co- and Fe-like ions between 1 angstrom and 30 angstrom. Then, X-ray conversion efficiencies were calculated using these spectra. Maximum X-ray conversion efficiency was obtained 3.54 % at power density of 5 x 10(12) Wcm(-2) into 2 pi steradian. X-ray pulse durations were calculated spectrally integrated total X-ray emission of the Ni-like and Co-like from Sn plasmas.Öğe Spectroscopic investigation of a double discharge pulsed electron beam generator(Taylor & Francis Inc, 2008) Goktas, H.; Kacar, E.; Demir, A.The wide range of applications of the plasma-based electron beam generator make it necessary to diagnose the device with a noninterfering method. The results of experimental and modeling studies of neutral helium and hydrogen beta spectral lines emitted from the double discharge pulsed electron beam generator are presented in this paper. Neutral helium lines emitted from the plasma in the pressure range 0.1-0.4torr are studied and compared with results of the collisional radiative model. The duration of the electron beam is shorter than 100 ns, and the peak current intensity is of order amperes. The full width at half maximum of the H spectral line is used for the determination of the plasma electron density, found as 3.16 x 10(21) m(-3) at 0.3 torr, and good agreement is obtained by comparing with the full computer simulation method.Öğe Spectroscopic measurements of electron temperature and electron density in electron beam plasma generator based on collisional radiative model(Taylor & Francis Inc, 2007) Goktas, H.; Demir, A.; Kacar, E.; Hegazy, H.; Turan, R.; Oke, G.; Seyhan, A.The current work describes a spectroscopic method for determining the electron temperature and electron density in an electron beam generator using argon spectral lines based on a collisional radiative model. Neutral and first-ionized Ar lines emitted from the electron beam generator are studied experimentally. A collisional radiative code was developed to simulate the Ar (I) and Ar (II) spectral emission and to compare the results with the experimental data for electron density and temperature determination. At lines and excited level densities were calculated by solving rate equations using the Gauss elimination method. The argon spectrum is recorded experimentally by superposing two discharges, namely a low pressure DC glow discharge and a high current pulsed discharge. Spectral lines between 350 nm and 950 nm were recorded using an integrated signal technique on a charge-coupled device. Electron temperature is determined by the relative intensity ratio method of two spectral lines. The relative intensity ratios of each peak are compared in a specific pressure range at various values, and good correlation is reported.
