材料

It is believed that the isolated ox pericardium may well be a good material for making artificial valve.

牛心包可能是一种制造人造瓣的较好材料，它的一些力学性能，如松弛、滞后和弹性模量的非线性性质，都类似于某些生物材料，因此可以把它看作是一种粘弹性的材料。

A finite element model of 3-3 piezocomposites was established according to the homogenization method, which combined the techniques relying upon representative volume element and periodic boundary conditions.

压电复合材料是由至少一种压电材料与非压电材料按照一定的连通方式组合在一起而构成的一种具有压电效应的新材料[1]。3 3 型压电复合材料是指压电相和非压电相分别三维连通的压电复合材料。

Keywords magnetic material;soft magnetic material;hard magnetic material;vacuum heat treatment;vacuum furnace;permalloy;silicon steel;deoiling

磁性材料；软磁材料；硬磁材料；真空热处理；真空炉；坡莫合金；硅钢；脱油

The mechanical properties,micromorpholgy microstructure of grain boundary and phase composition of Al_2O_3 composite ceramics were systematically studied ,the effect of additives,the relationship between microstructure and mechanical strength,the sintering mechanism of the material and influence factors of the structure and properties of Al_2O_3 composite ceramics were discussed respectively.

系统研究了氧化铝陶瓷的力学性能、微观形貌、晶界显微结构，并讨论了各添加组分的作用、材料显微结构与力学性能的关系以及材料的烧结机理和影响材料结构与性能的影响因素。

The most parts of thesis as follows:1. Five symmetrical intra-molecular charge transfer oligomeric phenylene vinylene light emitting materials were designed and synthesized using oligomeric phenylene vinylene as a framework.2. The structures of target molecule were characterized by ~1HNMR,~(13)CNMR, IR, MS and element analysis.3. In order to study the influence of the location and numbers of electron-donor and electron-acceptor on their photoelectric performance by changing length of OPV chain, the UV spectra and fluorescence spectra of target compounds has been compared. We have researched into main factors effecting on material emitting red-shift; organic electroluminescence device was prepared using the compound P4. The capability of eletroluminescence was researched.4. The photoelectric properties of P4 was explained by quantum chemical calculation (the Gaussian 98 quantum chemistry program). It is greatly contributed know the whole process of charge transfer to guide the design of red emitters.

本文研究的内容主要包括以下部分：(1)设计并合成5个对称的以齐聚苯乙烯类为骨架的分子内电荷转移型齐聚苯乙烯类发光材料；(2)通过IR，MS，~1H-NMR，~(13)C-NMR和元素分析对所合成的目标化合物进行表征；(3)通过对目标化合物的紫外光谱和荧光光谱比较分析，研究改变OPV的长度，电子给体和电子受体的位置及数量对其光电性能的影响，探讨材料发射红移的主要因素；选取性能良好的目标化合物P4制备成OELD器件，对其电致发光性能进行研究；(4)运用Gaussian98量子化学程序包，采用量子化学方法对目标化合物P4的光电性能从理论加以解释，进一步认识荷移跃迁的整个过程，为红光材料的设计加以指导。

Then, the technique is applied to study the coherent dynamics by detecting the photoconductivity for bulk GaAs, and fluorescence for rare earth solids.

然后，我们在研究了半导体材料和稀土样品的稳态性质后，用上述方法测量了GaAs体材料的光电导信号和稀土材料的荧光信号，研究其激发态的相干态动力学过程。

The microstructure of the scaffold was observed under photomicroscope and scanning electron microscopy,and the in vitro degradation time,permeability,tensile-strength,porosity,shrinka...

实验结果显示：支架中的成纤维细胞、脂肪细胞及组织纤维间质完全去除，胶原纤维得到了松散，并维持其原有的天然三维网络多孔结构；该材料透水汽性处于3000g.m-2.d-1左右，适合创面恢复；体外降解时间处于25～50h之间，并可根据需要调整工艺条件控制降解时间；拉伸强度介于10.20～11.50MPa之间，具有良好的拉伸强度；收缩温度介于70～85℃之间。上述结果表明该材料已解决了猪脱细胞真皮基质渗透性差、降解速度过慢的缺点，并且其透气性和拉伸强度高、降解性优良且可控，符合组织工程支架材料的要求。

The thesis designs the OFET based anthacene from materials characteristic, technics flow, device structure and materials selecting. It researches the technics and characteristic of anthacene film by scan electronic microscope、atom force microscope、X ray diffraction、photomicroscope, et al.

从材料特性，工艺流程设计、器件结构设计、材料选取等方面，设计制备了基于并三苯的有机场效应晶体管，采用扫描电子显微镜、原子力显微镜、X射线衍射分析仪、光学显微照相等手段研究了并三苯材料应用于OFET中各种成膜工艺及特性。

This paper adopt impact particle abrasion test and dissimilar steel welding test as mainly trial method to screen out the superior wearable material of pickax boot and discuss the question of the welding between wearable material of pickax boot and the pickax body material.

本论文采用冲击磨料磨损试验和异种钢焊接试验为主要试验方法，筛选出耐磨性能最优的镐靴耐磨材料以及探讨镐靴耐磨材料与镐体材料的焊接问题。

They think in getting their materials, also in arranging them, in plastering them together with mud.

河狸在寻找建筑材料，在把撒谎到的材料考虑怎样安放以及用泥土把这些材料粘合到一起时都在动脑子思考。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！