性能良好的

In this dissertation, refining grains, depositing conductibility carbon film on the surface of the particles and doping Mg~(2+) into the lattice of LiFePO4 were adopted to improve the electro-chemical performance of the cathode material.

本文运用了多种合成手段和分析技术，从材料制备、结构表征到电化学性能方面对磷酸亚铁锂进行系统深入的研究，制备出了性能良好的电极材料。

Magnetic drum coating material was prepared by using the magnetic slurry inunction process and the influence of component on the property of coating material was investigated .

研究了不同组分的配方对磁鼓涂层材料性能的影响，制备出性能良好的磁鼓。

It was important that the thixotropic agent,surface active agent and solid lubricating agent are added,the surface of magnetizable particles were suitable treated,at the same time,the stability and lubricating property of MRF were analyzed and discussed.

通过触变剂与表面活性剂复合使用，同时对磁性悬浮相表面进行适当的处理，并加入适当的固体润滑剂合成了一种稳定性和润滑性能良好的磁流变体材料，该磁流变体材料性能为：0η≤1000mPa.s，τ0.5T≥60kPa，半个月内无明显沉降，无板结，"四球机法"测量其润滑性能为磨斑直径。75mm，该类型磁流变液用于磁流变阻尼器200万次振动试验取得了理想的试验效果。

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。

A novel evolution algorithm with select-best and prepotency operator, named as select-best and prepotency evolution algorithm, was proposed.

提出一种寻优性能良好的优选优生进化算法，该方法与实数编码、线性交叉的遗传算法相比，计算复杂性低，离线性能和在线性能都有较大的改进，全局寻优能力明显提高。

One of their crucial functions is to make up the error recovery due to the deteriorative channel transmission conditions, provide better links condition to the transmission control protocol of upper layer. Then, the study of RLC and MAC two layers retransmission mechanism is very important to whole wireless system.

这两层有一个重要的作用就是弥补无线通信系统中信道条件不理想或底层不理想造成的传输错误，为上层的传输协议提供性能良好的链路环境，提高上层数据业务在无线传输通信系统中的性能，因此研究RLC和MAC层的重传性能对整个无线传输系统是很重要的。

In this paper, we analyzed the larch extract tannin, aminom ethylation of larch extract tannin, quaternization of cationic larch extract tannin and amphoteric larch extract tannin (sulfonation of the larch extract tannin quaternary ammonium) by infrared spectral analysis, confirmed the quarternization and sulfonate groups, and measured its water treatment properties such as flocculation, scale inhibition, results showed that quaternization of larch extract tannin and amphoteric larch extract tannin have better water treatment ability, can realize the multifunction.

本论文采用红外光谱法对落叶松单宁、胺甲基化落叶松单宁、阳离子落叶松单宁季胺盐、两性落叶松单宁进行了化学结构分析，并对其水处理剂性能如絮凝、阻垢进行了检测。实验结果表明：落叶松单宁季胺盐和两性落叶松单宁均具有较佳的水处理能力，是性能良好的一剂多效工业水处理剂。

The experimental results show that the optimum preparation conditions of catalyst of SO42-/Zr-CLC are achieved :pillaring material is 0.5mol/l ZrOCb,Zr/clay is 3mmol/g,accelerant is (NH4)2SO4 and the quantity of SO42- is 30%, the precursor of Zr-CLC is dipped by SO42- and is calcinated at temperature of 500 癈 for 2h.

将聚合羟基锆阳离子交联剂通过离子交换引入膨润土层间域撑柱膨润土，同时通过浸渍将SO42-引入到膨润土层间的锆阳离子表面，高温焙烧活化，合成了催化性能良好的中孔固体酸催化剂SO42／Zr-CLC，同时对催化剂的性能和结构进行了研究。

Selecting right asphalt and macadam and operating construction technique strictly are the guarantee of the good effect of synchronous macadam seal.

同步碎石封层技术是沥青路面养护的新工艺、新技术，性能良好的同步碎石封层机是实施同步碎石封层技术的基础，正确选用沥青和碎石、严格把握施工工艺是取得同步碎石封层良好效果的保证。

The strain L-3 that could produce raw starch-digesting glucoamylase were isolated from soil and mildewed rice. It was identified to be a Monascus Purpureus.

从土壤及霉变淀粉质材料等样品中分离获得到产糖化酶活性较高的菌株L-3，经鉴定为一种紫红曲霉；通过紫外线和硫酸二乙酯分别进行诱变，得到4株性能良好的糖化酶变异株，其中菌株7性能最好，命名为M.F7。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。