采用真空感应熔炼法制备了医用Ti-50. 7%Ni合金(原子数分数), 测试了铸态合金的成分、相变点、微观组织和硬度, 并采用Gleeble-3800热模拟实验机在变形温度750~950℃、应变速率0. 001~1 s-1, 应变量为0. 5的条件下对Ni-Ti合金进行高温压缩变形, 分析其流动应力变化规律, 建立了高温塑性变形本构关系和热加工图.结果表明: 当变形温度减小或应变速率增大时, Ni-Ti合金的流动应力会随之增大.应变速率为1 s-1时, 合金的真应力-真应变曲线呈现出锯齿状特征.根据热加工图, 获得了Ni-Ti合金的加工安全区和流变失稳区, 进而确定其合理的热变形温度范围为820~880℃, 真应变速率低于0. 1 s-1.从而为制定镍钛合金的锻造工艺参数提供理论和数据基础

modern life becoming faster and faster both parent and child are too busy to spare enough time to exchange ideas, even if Today more and more advertisement are seen on the Tv screen It's difficult to they find it necessary to communicate

第一节 地质环境 13.1 Geological Environment 13.1.1 Environemnt and Geological Environment 13.1.2 Contents of Environmental Geology 13.1.3 Advances in Environmental Geology 13.1.4 City and Geological Environment 13.1.5 Geological Environment and Mankind’s Health 13.1.6 Waste Disposal and Geological Environment 第二节 地质灾害 13.2 Geological Disasters 13.2.1 Types of Geological Disasters 13.2.2 Earthquakes

Some disorders result when a mutation causes the product of a single gene to be altered or missing. These disorders are inherited in simple patterns similar to or identical with those described by Mendel for certain discrete characteristics in garden peas. Therefore, it’s also called Mendelian diseases

4.1 叠加定理 (Superposition Theorem) 4. 2 替代定理 (Substitution Theorem) 4.3 戴维南定理和诺顿定理 (Thevenin-Norton Theorem) 4. 4 特勒根定理 (Tellegen’s Theorem) 4. 5 互易定理 (Reciprocity Theorem) 4. 6 对偶原理 (Dual Principle)

一、变力沿直线所作的功 由物理学知道,如果物体在作直线运动的 过程中有一个不变的力F作用在这物体上,且 这力的方向与物体的运动方向一致,那么,在 物体移动了距离s时,力F对物体所作的功为 W=. 如果物体在运动的过程中所受的力是变化 的,就不能直接使用此公式,而采用“微元法” 思想

第一类曲线积分 设一条具有质量的空间曲线L上任一点(x,y,z)处的线密度为 p(x,y,z)将L分成n个小曲线段L(i=1,2,…n),并在l上任取一点 (5,n,5),那么当每个L1的长度△都很小时,L的质量就近似地等于 i2li p(5,n,5)△,于是整条L的质量就近似地等于 ∑ (5,n,5)S1 当对L的分割越来越细时,这个近似值的极限就是L的质量

Unit 1 How tall are you? Unit 2 Last weekend Unit 3 Where did you go? Unit 4 Then and now Recycle Mike's happy days Appendix 1: Songs in each unit Appendix 2: Words in each unit Appendix 3: Vocabulary Appendix 4: Useful expressions Appendix 5: Proverbs Appendix 6: Short plays Appendix 7: Irregular verbs Appendix 8: English pronunciation patterns

1. Conceptual overview and uses of the Statement of Cash Flows Intermediate Accounting 5 The Statement of Cash Flows A statement of cash flows is a financial statement of a company that shows the cash inflows, cash outflows, and net change in cash from its operating, investing, and financing activities during an accounting period, in a manner that reconciles the company's beginning and ending cash balances

第一章 基础知识. 2 第一节 PLC 程序的编制. 2 第二节 实验台布置及原理图. 5 第二章 实验内容. 6 实验一 基本指令的编程练习. 6 实验二 十字路口交通灯的模拟控制 . 8 实验三 步进电机控制实验.10 实验四 三相异步电机联锁正、反转控制.13 实验五 三相异步电机降压起动控制 .17 实验六 三相异步电动机点动控制和自锁控制.21 实验七 PLC 控制的变频调速实验.25 实验八 PLC 控制的三相异步电机降压起动.26 第三章 附录 .28 附录一 S7-200 的 SIMATIC 指令集简表.28