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University, Changsha 410083, China) Abstract: Frequency-dependent characteristics of a class 3 AVO model were performed using Chapman rock physical model. Treating the spectral amplitude as reflective... different in elasticity situation and dispersion situation. Key words: frequency-dependent AVO; Chapman rock physical model; spectral decomposition; hydrocarbon detection 地震勘探一直以来都是油气勘探的主要方法.AVO......
:2000-03-17 Effect of copper on physical and mechanical properties of powder metallurgy airplane brake materials Abstract: The effects of copper content on the physical... metallurgy; physical property; mechanical property; Received: 2000-03-17 粉末冶金航空刹车材料随着飞机性能的不断提高而发展. 由于其应用领域的特殊性和对国民经济以及国家安全的重要性, 其技术具有较大的保密性, 难以找到系统的文献. 为了促进我国航空刹车材料的发展, 有必要对刹车材料进行系统研究......
solve continuous and discontinuous problems in a unified framework with a two-cover system, i.e., the mathematical cover and physical cover. However, renewal of the topology of the two-cover system... to the previous and latest crack tip position; and 2) local topological update of the manifold elements, physical patches, block boundary loops, and non-persistent joint loops according to the scenario......
physical parameters, a prediction of compression index was carried out with BP neural network based on the testing data of soil in several engineering sites. Taking plasticity index, water content, void... on 4 routine physical parameters is doable. Key words: compression index; BP neural network; prediction; routine physical parameters 地基岩土变形参数是岩土工程中的重要指标,也是研究的热点问题之一[1-3].土压缩指数是表征土体压缩性的重要变形参数,一般通过室内侧限压缩......
Effect of volume fraction of ramie cloth on physical and mechanical properties of ramie cloth/UP resin composite LEI Wen(雷 文), LEI Wen-guang(雷文广), REN Chao(任 超) College of Information Science... temperature for 24 h and treated at 80 ℃ for 2 h. The physical and mechanical properties of the composites with different volume fractions of ramie cloth were studied. The results show......
was fabricated by electron beam physical vapor deposition technique and the effects of the heat treatment on the microstructure and tensile strength of the NiCoCrAl alloy sheet were investigated... is reduced significantly, which also confirms that the interface bonding is improved by the heat treatment. Key words: nickel-base alloys; heat treatment; microstructure; mechanical properties; physical......
vibration and low pressure was investigated by casting experiment and physical model. Experimental results indicated that the burst feeding appeared repeatedly during solidification and left a shrinkage cavity with layered structure under mechanical vibration. The castings with less shrinkage and higher density could be achieved through the vibration. The calculation results of physical model showed......
the atomization characteristics of non-normal fuel in-cylinder under the condition of super-high pressure injection, the relationship between physical properties of non-normal fuel and pressure was analyzed... fuel to the surrounding and the bottom of combustion chamber. Key words: diesel engine; super-high pressure; spray characteristics; flash photography; physical parameter 随着全球能源利用标准和排放法规日趋严格,各国政府对柴油机尾气排放......
