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4篇 您的检索式:作者名="A.Verma"
    题名 作者 年代 出处 被引量
1Influence of Metal Oxides on the Arc Erosion Behaviour of Silver Metal Oxides Electrical Contact Materials显示文摘In the present work investigations have been made to see the role of metal oxides on the performance of the silver metal oxides electrical contact materials. Silver metal oxide materials of three different compositions Ag-10CdO, Ag7.6SnO2-2.3In2O3 and Ag-10ZnO were prepared by internal oxidation process under identical processing conditions.These materials were tested for electrical conductivity, hardness, and erosion loss. Performing an accelerated test on the actual contactor assessed the electrical performance, involving erosion loss and temperature rise of the processed materials. The arc-eroded surface was characterized under scanning electron microscope. The study of the eroded surfaces of contacts indicates that the thermal stability of metal oxides depends on nature of silver-metal oxide interface and their mode of erosion. An attempt is made to correlate the surface features of the eroded contacts with the thermal stability of metal oxides.P.Verma O.P.Pandey A.Verma 2004Journal of Materials Science & Technology2004,20,1:14
2Status of vitamin E and reduced glutathione in semen of oligozoospermic and azoospermic patients显示文摘Aim: To investigate the status of seminal plasma reduced glutathione (GSH) and vitamin E in three different conditions of spennatogenesis: azoospennia, oligozoospennia and nonnospennia. Methods: Reduced glutathione was measured in the seminal plasma by the method of Moron et al (1979), and vitamin E estimation was performed by the method of Taylor et al ( 1976). Results. Vitamin E levels in seminal plasma of oligospermic and azoospelxnic sampies were significantly decreased to 65.54% and 66.04% respectively as compared to the nonnospermic group. Levels of reduced glutathione were also significantly decreased in oligospermic and azoospennic group, and the reduction in azoospermic group (76.73 % ) was more pronounced than oligozoospermic group (62.07 % ). Conclusion: The decrease in reduced glutathione, an endogenous antioxidant, levels in azoospermic and oligozoospermic conditions may cause disruption in the membrane integrity of spermatozoa as a consequence of increased oxidative stress.A.Bhardwaj A.Verma S.Majumdar K.L.Khanduja 2000Asian Journal of Andrology2000,2,3:3
3Test interval optimization of safety systems of nuclear power plant using fuzzy-genetic approach显示文摘K.D.Rao V.Gopika H.Kushwaha A.Verma A.Srividya 0,,07:1
4A 10-Bit 500-MS/s 55-mW CMOS ADC显示文摘A.Verma B.Razavi 0,,:1
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