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Thermo-Electrical Properties in Pb-Sb Hypereutectic Alloy
M. ¸Sahin,E. Çadırlı,Y. Sürme,D. Özkır 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Pb-17 wt% Sb hypereutectic alloy was directionally solidified upward with three different growth rates (8μm/s, 18 μm/s, 42 μm/s, 166 μm/s and 497 μm/s) at a constant temperature gradient (3.6 K/mm) in the Bridgman-type growth apparatus. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (λ1) and secondary dendrite arm spacing (λ2) on the growth rate (V) were determined by using a linear regression analysis. Variations of electrical resistivity (ρ) for cast samples for temperatures in the range of 300-550 K were measured by using a standard dc four-point probe technique. The variations of thermal conductivity with temperature for the same alloys were determined from the WiedemannFranz and SmithPalmer equations by using the measured values of electrical resistivity. The enthalpy of fusion for the same alloys were determined by means of a differential scanning calorimeter from a heating trace during the transformation from solid to liquid. The corrosion resistance was analyzed by Tafel extrapolation and linear polarization resistance methods conducted in a 5% sodium chloride solution in contact with air maintained at room temperature. Effects of the growth rate on the electrical resistivity and corrosion resistance were also investigated.
Absorption cooling R&D in Europe
Kuhn, A.,Petersen, S.,Riebow, D.,Sahin, D.,Ziegler, F. The Society of Air-Conditioning and Refrigerating 2004 설비저널 Vol.33 No.3
This article reviews absorption cooling R&D in Europe from the viewpoint of fundamentals, cycle development and applications. The review contains information on R&D, predominantly of public projects in the field of sorption cooling. We report on research which is performed in Europe with some stress on Germany. There is progress in fundamentals, thermodynamic cycle design, and also applications. In the fundamentals part the discussion about thermodynamics, working pairs, and heat and mass transfer is reflected. Today's discussion on thermodynamic cycles is not very strong. Main focus is on special solid sorption cycles, compressionsorption hybrids, and open cycles, In the applications part the chilling business is the main issue. Some interest is given to the improvement of efficiency on and the adaptation to low temperature waste heat use, but the stress is on the use of solar energy as heat source. The area of heat pumping for heating purposes is less prominent but not at all negligible. Finally, industrial heat pumping involves the reverse cycle (heat transformer, heat pump type Ⅱ) also, but there is no significant activity.
Mirror Image Gerbode or Partial Atrioventricular Canal Defect?
Cem Ariturk, Ass.Prof.,Ahmet Umit Gullu, Ass.Prof.,Sahin Senay, Ass.Prof.,Eyup Murat Okten, M.D.,Fevzi Toraman,E. Hasan Karabulut, Prof.,Letisya Melengic, M.S.,Cem Alhan, Prof. 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.6
Gebode defect, that can accurately be treated surgical repair, is defined as a true communication between left ventricle and right atrium. A 74-year-old woman with a worsening history of ortophnea and peripheral edema was hospitalised. A communication between right atrium and left ventricle was diagnosed using transeusophageal echocardiography. The defect was repaired and mitral valve was replaced with a biologic valve. It would be beter to tailor surgical strategy for each case with atrioventricular canal defect after preoperative transeusophageal echocardiography and peroperative direct sight.
Borawska, M.H.,Czechowska, S.K.,Markiewicz, R.,Hayirli, A.,Olszewska, E.,Kazim Sahin, D.V.M The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.2
The effects of lycopene, genistein, and epigallocatechin-3-gallate (EGCG) on cell viability were tested in vitro using a normal human skin fibroblast (NHSF) cell line (CRL-1474) and granulation tissue fibroblasts (GTFs) obtained from a patient with middle ear cholesteatoma. Cell cultures were added with lycopene (1, 5, and $10\;{\mu}M$), genistein (1, 5, 10, 25, and $50\;{\mu}M$), and EGCG (1, 5, 10, 25, and $50\;{\mu}M$) and their respective control cultures were established by adding 5 mL/L tetrahydrofuran (THF), 5 mL/L dimethyl sulfoxide (DMSO), and 5 mL/L DMSO. A colorimetric assay was employed for determining cell viability using thiazolyl blue tetrazolium bromide. Cell viability was expressed as a percentage of the control. Data were analyzed using two-way analysis of variance separately for each compound. Lycopene addition decreased viability of NHSFs and GTFs compared with THF addition (64.1%, 60.5%, and 100%, respectively, P < .0001). Genistein addition also increased viability of both NHSFs and GTFs compared with DMSO addition (P < .02). Increasing EGCG concentration tended to cause a linear increase in viability of NHSFs but did not alter viability of GTFs (P < .10). Our data suggest that genistein and EGCG but not lycopene could help maintaining or improving skin health through enhancing viability of skin fibroblasts.