构

The crystallographic textures in the first group are characterized by the relatively weak {111} and {114} components;for the second group, the characteristic texture co...

结果表明，带铸材试样中存在{111}与{114}特征织构，织构强度均较弱；铸坯切片中存在{111}与{001}特征织构，并且因局部凝固冷速不同存在明显的织构强度差异。

By considering torque characteristics of variable-frequency motors and mesh stiffness as well as backlash nonlinearity in gear transmission,a dynamics model for the cutting system of shield tunneling machine with redundant drives was established. The fluctuation characteristics of torque loads and dynamic cutterhead driving torque in composite strata were analyzed.

复合地层掘进扭矩载荷突变是造成盾构机掘进过程中堵转停机的直接原因，考虑盾构机刀盘驱动变频调速电机特性、转矩传递过程中齿轮啮合刚度及齿侧间隙等非线性因素，建立冗余驱动的盾构机刀盘切削系统机电耦合动力学模型；针对典型复合地层地质条件，对盾构机在上软下硬地层掘进过程中刀盘驱动转矩动态特性进行仿真分析。

And then the influence of two of the damage models, the Kachanov and the gradient dependent constitutive equations, on the well posed properties of the fundamental equations in continuum damage mechanics is studied according to th.

首先从非局部理论出发，推导了应变梯度损伤本构方程；然后利用一阶拟线性偏微分方程组的特征理论，在一维弹性损伤情况下分析了两种不同的本构模型，即 Kachanov损伤本构方程与应变梯度损伤本构方程，对连续介质损伤力学基本方程适定性的影响。

These results show that the dual fluorescence of 4-AHBO (5-AHBO) is produced by its different tautomers, hut not by the same isomer: the long wavelength emission is from the keto tautomer, and the short wavelength band is produced by four kinds of enol isomers.

结果表明，4-AHBO(5-AHBO)的双荧光不是由同一种异构体发射的，而是来源于不同异构体的发射：长波区的荧光由酮式构型发射，短波区的发射则可能由四种醇式异构体共同产生。

Cephalotaxine ester of 2-oxo-6-methylheptanoic acid was treated with lithium diisopropylamide and Me O-(1-methoxyisopropyl)glycolate to give a mixture of homoisoharringtonine and its stereoisomers with 56% yield. The four stereoisomers separated by TLC showed identical mass spectra and almost superimposed IR but with different 1H NMR spectra. The configuration of the 2'-C and 3'-C of the four isomers were postulated based upon their 1H NMR spectra as compared with the 1H NMR spectra of isoharringtonine and its stereoisomers.

2-氧代-6-甲基庚酰基三尖杉碱(3)与0-(1-甲氧基异丙基)羟基乙酸甲酯(4)在强碱性试剂二异丙胺锂存在下，起亲核加成反应，反应中间体5在室温用酸性丙酮水解，得到一种新的三尖杉酯类生物碱一一高异三尖杉酯碱(6c)及其立体异构体(6a、6b、6d)的混合物，产率56%、通过制备薄层层析分得这四个立体异构体，它们的1H NMR和异三尖杉酯碱及其立体异构体的1H NMR类似，推定了它们的绝对构型。

Structure design and control method of the cutter body system are the main problems in producing shield driven by hydraulic cylinder directly , in-depth and systemic research about these important probl.

液压缸直接驱动盾构是一种全新的盾构机型，目前国际上和国内还无同类产品出现，因此，液压缸直接驱动盾构的研究，对于发展具有我国自主知识产权的盾构技术无疑具有重要意义。

Based on the investigation and research on shield machine technology, and studying the hydraulic thrust control system of shield machine by reading, analyzing, summarizing lots of literatures and investigating at site. Referring to the simulation experiment platform of shield machine built by ZheJiang University and ShangHai Tunnel engineering corp., analyzing the work principle of the thrust hydraulic system and the thrust attitude control method of shield machine.

在对盾构技术充分调研的基础上，通过阅读、分析及综合大量文献和现场调研，参照浙江大学和上海隧道工程公司共建的盾构模拟实验台，分析了盾构液压推进系统工作原理及其掘进姿态控制的方法，对盾构液压推进控制系统进行了控制仿真研究。

Concretely, we hope to know whether a central hyperplane arrangement can be decomposed into several irreducible subarrangements or not.

具体地讲，希望知道能否把中心构形分解为若干个不能再分解的子构形，把对中心构形的研究归结为对它的不可约子构形的研究。

In chapter 3, Jordan derivations and Jordan isomorphisms of nest algebras are investigated. It is proved that every Jordan derivation of nest algebra is an inner derivation. Every Jordan isomorphism between nest algebras is either an isomorphism or an anti-isomorphism. Finally, a norm estimate for derivations of nest subalgebras of von Neumann algebras is given, and it is shown that every nest subalgebra of factor von Neumann algebras has property AIP .

第三章研究了套代数上的Jordan导子和Jordan同构，证明了套代数上的每一个Jordan导子都是内导子；套代数之间的每一个Jordan同构要么是同构要么是反同构；最后给出了因子von Neumann代数中套子代数上导子的一个范数估计，同时也证明了因子von Neumann代数中的任何一个套子代数都具有AIP性质。

In the simulation, the control of two satellites with different mass (6tons, 9tons) under pentagonal pyramid configuration and tetragonal pyramid configuration has been studied individually by means of zero movement additive.

基于五棱锥构形和金字塔构形两种构形采用零运动添加的方法研究了两种不同质量的卫星(6吨、9吨)的控制情况，表明五棱锥构形的控制力矩陀螺系统能够满足任务要求，姿态稳定度1×10~4°/s，指向精度0.1°。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。