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Being aimed to developing intermetallic base structural materials to be worked at above 1000℃, a systematic investigation has been performed of the fundamental crystallographic structure, phase constitution map, density-composition dependence, oxidation resistance and general mechanical behaviour for the ternary intermetallic alloys in the Nb-Ti-Al system. Promissing results have been obtained at the initial stage in the current program. The 1100℃ high temperature strength at the strain rate of 10-2/s and 10-5/s for the ternary compound NbTiAl3 (γ1) base alloys are generally much higher than that of the binary compound TiAl (γ), especially in the γ1 + α2 phase region, it is as high as twice as that of TiAl. The densities are 4.1-4.79g/cm3, depending on relative amount of the intermetallics involved and the density difference between the intermetallics. The oxidation resistance at th
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《医学生理学 Medical Physiology》参考教材资料(PDF电子书籍)Fundamental Neuroscience, Third edition, 2008
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• Define privacy and fundamental computer-related privacy challenges • Privacy principles and laws • Privacy precautions for web surfing • Spyware • Email privacy • Privacy concerns in emerging technologies
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Understanding materials, their properties and behavior is fundamental to engineering design, and a key application of materials science. Written for all students of engineering, materials science and design, this book describes the procedures for material selection in mechanical design in order to ensure that the most suitable materials for a given application are identified from the full range of materials and section shapes available. Extensively revised for this fourth edition, Materials Selection in Mechanical Design is recognized as one of the leading materials selection texts, and provides a unique and genuinely innovative resource
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Department of Earth and Space Sciences, University of California, Los Angeles The unifying theme in this section is the remarkable weakness of major faults. I will consider the diverse new evidence for weakness, and the evidence for high pore pressure localized in faults as a fundamental cause. With this background one can better understand why faults remain active even after large rotations with
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The important of acid-base reaction: 1. is a simple, fundamental reaction. 2. enable you to see the mechanism of the reaction 3. illustrate the process of bond breaking and bond making 4. examine important ideas about the relationship between the structure of molecules and their reactivity
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Computational geometry Algorithms for solving “geometric problems” in 2D and higher. Fundamental objects: point line segment line Basic structures: point set polygon
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1858 ~ 1861, Kekulé, Couper, and Butlerov, laid the basis for one of the most fundamental theories in chemistry: the structural theory. Valence(化合价): C — tetravalent; O — divalent; H — monovalent
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The diffusion of new products and new processes of production within and between business enterprises is clearly one of the fundamental aspects of the process of growth and transformation of contemporary economies It is well known that the diffusion of new products and processes takes varying lengths of time: some economic agents adopt very early after the development of an innovation while others sometimes do it only after decades
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证券投资的基本分析(Fundamental Analysis) 证券投资的基本分析:就是通过对影响证券市场 (主要是股票市场)供求关系的基本因素,即宏观 经济情况、行业动态变化、公司业绩前景、财务结 构、经营状况以及政治因素、心理因素等进行分析, 确定证券(主要是股票)的内在价值,衡量其价格 是否合理,为投资者提供选择证券的依据的分析方 法
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