无结构

It has been proved that it was an amorphous plastics with high glass temperature,soluble in some solvents at room temperature and the polymer was also an intermediate product of cross-linked copolymer and grafted copolymer.

结果表明，这系列聚合物是具有较高的玻璃化温度的可溶性无规共聚物。聚合物含有不饱和双键结构，可作为交联聚合物、接枝聚合物及其它特种高分子材料的中间体。

The electromagnetic spring with tooth structure is adopted in this paper to adjust the stiffness of isolator, which make the isolator work with different stiffness in different excited frequencies. So the isolation performance is improved as the resonance frequency is eliminated in a broad band.

本文采用齿形结构的电磁弹簧来改变隔振器的刚度，使隔振器在不同外扰频率下变刚度运行，从而能实现在较宽的频带范围内无共振峰，改善隔振性能。

In this article, the general finite element software ABAQUS is adopted to set 3D model and to simulate the construction of pit excavation. Furthermore, it analyzes the loading and deformation of the non-pin build-up arch structure systemically based on the following aspects: the embedding depth, the depth of pit excavation, the thickness of crown, the diameter and length of the springe, ratio of rise to span .

本文采用大型有限元程序Abaqus建立三维模型，模拟基坑开挖的施工过程，对具有无铰拱特性的组合拱结构从拱的插入深度，基坑开挖深度，拱冠厚度，拱脚直径和长度，矢跨比等方面进行了受力和变形的系统分析。

The relation between the parameter of ground motion and time is transformed into a pure random process with the amplitude varying with time. Based on the concept that there is the scaling invariant fractal structure in the transmission of earthquake motion and the self-affinity of the ground motion signal in time domain, an assumption is deduced that the curve of the stationary random noise of the ground motion varying with time is a fractal graph.

将一个运动参数的时间变化过程转化为具有时变振幅的一个纯随机振荡问题，运用地震运动传递具有无特征尺度的分形结构和地运动时域信号具有统计自相似性的概念，提出地面运动随机平稳噪声的时变曲线是一条分形曲线的假设。

Based on the aberration theory of AWG, a new-type flat-field AWG is designed. The focal signals of all wavelengths of operation are focusing along a straight line perpendicular to the propagation direction. Three stigmatic points restrain three dominant geometry parameters. Furthermore, a new-type flat-field wavelength router with both flat input field and flat focal field is also designed.

基于阵列波导光栅的像差理论，利用三个无像差点约束三个主要结构参量，设计了新型平场聚焦阵列波导光栅，使得所有工作波长的输出信号都聚焦在与光束传输方向垂直的直线上，并进一步将其拓展为同时具有平输入场和平聚焦场的新型平场波长路由器。

Methods 520fetuses in24～40weeks were examined by color Doppler echocardiography on four-chamber views and subcostal views to determine CHD.

使用彩色多普勒超声诊断仪随机对520例胎龄24～40周的胎儿，在心脏超声四腔观基础上结合多切面观察胎儿心内结构，以确定胎儿有无先心病。

Objective To investigate clinical significance of color Doppler echocardiographic diagnosis in prenatal diagnosis of fetal congenital heart disease.Methods 520fetuses in24～40weeks were examined by color Doppler echocardiography on four-chamber views and subcostal views to determine CHD.

目的 探讨彩色普勒超声心动图对胎儿先天性心脏病产诊断的临床意义方法使用彩色多普勒超声诊断仪随机对520例胎龄24～40周的胎儿，在心脏超声四腔观基础上结合多切面观察胎儿心内结构，以确定胎儿有无先心病。

ABSTRACT Sublevel caving method is a high efficiency mining method for underground mine, it has many advantages, such as a simple mine stope, good work condition, high mechanization and low mining cost. Up to now, this method has been used in more than 85 percent of all underground iron mine.

无底柱分段崩落法是一种高效率的采矿方法，具有采场结构简单，作业条件好，机械化程度高，回采强度大，采矿成本低等优点，迄今应用该采矿方法采出的矿石量约占我国地下铁矿采出矿石总量的85％。

In view of the key problem of subminiature underwater robots, structural improving,control algorithm and underwater experiment is studied. They can be described as follow: Firstly, the subminiature underwater robot should be compact in size and low cost, for which, it is difficult for us to control its balance. So that, a new kind of piston--style ups and downs system was invented, which can keep the underwater robot horizontally suspended in the water without driving force.

中文摘要本文针对超小型水下机器人在运动中存在的问题，设计了一种新的超小型水下机器人的沉浮结构形式，着重研究了其运动学动力学性能、探讨了相应控制算法、进行了水下试验，具体研究内容如下：首先，超小型水下机器人由于体积小重量轻，在水中沉浮时悬停平衡控制困难，为此进行了一种新的活塞式沉浮系统设计，该系统使水下机器人能够在无动力驱动的情况下，使其呈水平状态稳定悬浮在水中。

The EDFL is structured by insertion of three different short passive subring cav it ies, which serve as mode filters, into the main cav it y, and it is combined w it h a fiber Bragg grating, the MRCs resonator can make SLM lasing.

这种激光器通过在主环形腔中插入充当模式滤波器的三个长度不等的无源次级环形腔，并结合腔内光纤布拉格光栅形成多环形腔掺铒光纤激光器结构，多环形谐振腔可保证激光器的单纵模输出。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。