q畸变算符的本征态及其性质

本文讨论了ｑ畸变算符ｂ的本征态及其性质，并以此分析了普通相干态三种等价定义的ｑ推广中出现的问题。文中也分析和讨论了ｑ畸变算符ｂ￣＋的本征态及其相关问题。     

基于有限体积模拟的模锻优化设计

在锻造等金属大变形的工艺设计中,相关参数的确定很大程度上依赖于经验公式,而有限元法在金属大变形过程数值模拟中有明显的局限性,且模拟结果难以验证.本文基于有限体积法模拟了一典型开式模锻过程,并在通用经验值允许的范围内,根据模拟结果调整工艺设计中的参数设置,有效避免了一种锻件常见缺陷.通过分析变形过程特定时段的变形区形状、分流面的变化及变形力分布曲线,结合相关塑性理论验证了模拟结果的正确性,实现了工艺优化设计.研究证明理论预测与数值模拟相"拟合"的方法可以代替实验用于指导生产实践.     

非线性力学中的虚功率原理

导出非线性平衡方程和3种常用的非线性虚功率方程.在解非线性问题时,构型的选择和应力-应变率(或与变形有关的率)的选择是两个重要问题.构型包括两种:初始构型和变形构型.在选择应力-应变率(或与变形有关的率)的时候,要注意它们之间的配对,即要考虑功率共轭的问题.在变形构型下,选择Cauchy应力σij与变形率Dij;在初始构型下,可以选择名义应力Pji与变形梯度率.Fij,或者选择第二类Piola-Kirchhoff应力Sij与Green应变率E.ij.     

q形变光场的相干态与JC模型

给出了共振条件下ｑ形变Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模型的精确解，讨论初始光场为ｑ形变偶相干态时原子反转的骨塌－回复现象及ｑ形变光场的动力学行为。     

Fe-28Mn-3Si-3Al TWIP钢变形的微观组织特征

采用扫描电镜、透射电镜和电子背散射衍射技术对TWIP钢拉伸变形后的组织进行了观察和分析. 研究结果表明,热处理后的TWIP钢中存在60%的退火孪晶,变形后孪晶量减少为32%. 在拉伸过程中,具有退火孪晶的晶粒内部首先发生变形,产生的变形孪晶遗传了退火孪晶的取向. 变形过程中孪晶和位错相互作用、孪晶和孪晶相互作用以及孪晶取向改变引发滑移的综合结果使TWIP钢同时获得高塑性和高强度,因此变形过程中孪生变形是TWIP钢的主要变形机制.     

TURBO编码技术在CDMA-2000中的性能研究

介绍了Turbo码的编解码技术,并且结合CDMA2000中编码方案的具体要求,对Turbo码的参数:交织长度、迭代次数、码率等因素进行了深入分析,仿真结果表明选择合适的交织长度、迭代次数、码率能减少译码的复杂度和减小译码的延时。     

B超心脏轮廓图象光流场匹配策略新方法

介绍了Ｂ超心脏左室腔壁轮廓图象（短轴截面方向）光流场匹配策略的一种新方法．这种方法在分析心脏运动的基础上结合统计原理得到，能比较准确反映心脏左室病变部位的特征．经病例实践检验，其结果和临床诊断相符     

偶偶变形核基带转动谱

通过修正Ｂｏｈｒ哈密顿量，获得新的四参数的转动谱公式，利用最新的稀土区和锕系区偶偶核基带的实验数据，对该公式进行拟合，从计算结果可看出，符合较好     

New research progress on the ultrastructure of tectonically deformed coals

The structure of tectonically deformed coals shows some characteristics and regulations on the ultra-scale when influenced by different factors such as temperature, pressure and directional stress. Deformations of the macromolecular structure may induce changes in the nano-scale pore structure, which are very important for gas adsorption and pervasion. The geological impact of different mechanisms of deformation on different types of ultrastructure of tectonically deformed coals is not only of significance as a topic for scientific research, but also in studying environments of metamorphism-deformation at differing metamorphic stages. This research is also very important in studying the accumulation and occurrence conditions of coalbed methane gas, mechanisms of coal and gas outbursts, predictions of coalbed methane resources and dangers of coal and gas outbursts. This paper analyzes current research, within China and other countries, in the ultrastructure of tectonically deformed coals. The research includes (1) structural models of tectonically deformed coals; (2) the relationship between ultrastructure and stress; (3) the structure of tectonically deformed coals and its strain environment. These results are also based on our own experiments including vitirnite reflectance (R_o,max), X-ray diffraction (XRD) and nuclear magnetic resonance (NMR (CP/MAS + TOSS)). We discuss the important effects of the structure of tectonically deformed coals and their physical properties, and then point out some problems concerning the research progress of tectonically deformed coals.