利用金相显微镜和微型拉伸试验机对SAC305-Bi钎料合金的润湿性、组织和力学性能进行了研究。结果表明:SAC305-Bi钎料合金的润湿性随着Bi元素含量的提高而逐渐提高;当Bi元素含
Primary production, bacterial production, par-ticulate organic carbon fluxes and organic carbon burial rates were quantified during the summer period of 1999 in
利用PCVD复合渗镀技术对W6Mo5Cr4VZ(MZ)高速钢刀具进行表面强化处理。研究了未处理及PCVD复合渗镀处理高速钢刀具的表面显微硬度,分析了PCVD前后高速钢刀具的摩擦磨损性能及
Based on the analyses of hydrocarbon inclu-sions, K-Ar dating of authigenic illites and oil/gas-watercontact retrospection as well as other methods, the marine
This paper describes the relative contents of dominant diatom species and the distributive characteristics of tropical pelagic species and diatom assemblages, a
During 1985-1987, the concentration of nitrate nitrogen was higher in the Laizhou Bay and the Bohai Bay while that of nitrite nitrogen was higher in the Liaodo
身体绝不只是生理学意义上的“肉体”或“躯体”,身体本身就具有精神性。它是人类一切活动的“起源之所”,承栽着人们的思想、感情、意志及其他的一切思维和活动形式。反观我们