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Imbursed by the sub-item"Research on System Framework of Joint Source-Channel Coding under Wireless Circumstance"of national high-tech research and development plan(863 plan)"Digital Audio, Video Encoding, Transmission, Testing and Applying Model"(No.2002AA119010), and the great item"Research of Future Communication System Fundamental Theory and Technology (No.60496315)", the dissertation studies several key techniques of Low-Density Parity-Check Codes that were considered much in error correction codes field.

本文正是在国家高技术研究发展计划(863计划)&数字音视频编码、传输、测试与应用示范&(No.2002AA119010)的子课题&基于无线环境的联合信源信道系统框架研究&、国家自然科学基金重大项目&未来移动通信系统基础理论与技术研究(No.60496315)&等研究项目的资助下，对近年来在纠错码领域表现抢眼的低密度校验码(Low-Density Parity-Check Codes，LDPC)的若干关键技术展开了研究。

The inductions of stomatal closure by NO were enhanced by higher concerntration of Ca2+,and the role of NO appears to demonstrate to be obvious time and concentration effects.

NO能够诱导桐花树气孔的快速关闭，并且NO的作用表现出明显的时间效应与浓度效应。

It was found that the 2FKn=52, the karyotypic formula is 9+5+12 in this two species. But FKP. mouhtiihas AN=78, its NORs located on the No.4 q of group A, while AN=76, NORs located on No.7 q of group A in FKC.

但锯缘摄龟AN=78，其NOR位于A组No.4的长臂上，而齿缘摄龟AN=76，NOR位于A组的No.7的长臂。

It was found that tignite and its char have their NO re d uction efficiency higher than those of other coals and chars.The content of vola tile in coals,surface area of the chars and the content of metal catalyst in ash are all important factors affecting the NO reduction efficiency.

实验结果表明，褐煤及褐煤焦对NO的还原能力明显强于烟煤和烟煤焦，煤粉挥发分含量、煤焦颗粒的比表面积和煤灰中的金属氧化物含量都对NO还原有重要的影响。

The relationship between ageing and the level of NO, SOD and MDA in hear and brain of aged ratsSONG Chun mei,MA Hong bo,WANG Chang wen,LI Yong jin(Department of Nutrition, Jilin Medical College, Jilin City, Jilin Province,132013,China)Abstract:ObjectiveTo determine the contents of NO, MDA and the activity of SOD in heart and brain of aged rats, and probe the relationship between ageing and the level of NO, SOD and MDA.

目的测定大鼠心脏和脑组织中一氧化氮、丙二醛含量和超氧化物歧化酶活性，探讨NO、SOD和MDA与衰老的关系，为延缓衰老、合理而又科学地应用抗衰老食品和保健品、提高机体SOD活性和降低MDA的含量、减少老年性疾病的发生提供理论依据。

Firstly, simultaneous removal of NO〓-C over mixture of metal oxides catalyst and carbon black was carried out with and without the assistanet of plasma. Secondly, catalysts loaded on γ-Al〓O〓 spherules were exposed to CA498 diesel exhausts to capture the PM, then the investigation into simultaneous removal of NO〓 and PM over catalyst with and without the assistant of plasma was conducted.

首先以复合金属氧化物催化剂和碳黑粉末的紧接触混合物为对象，进行等离子体／催化同时去除NO〓和碳黑的研究；然后以涂覆有催化剂的γ-Al〓O〓小球为载体，在实际柴油机尾气中挂烟，通过等离子体／催化作用，在模拟的富氧柴油机排气环境中，达到同时去除NO〓和微粒排放的目的。

These data indicate that coelomocytes are capable of producing and releasing NO and that NO is a chemical mediator that has been consered as a host defense weapon of phagocytes through eolutionary time.

这些数据显示体腔细胞具有产生和释放NO的能力，并且NO是一个在以吞噬作用为主体防御武器而在进化过程保留下来的化学中介。

By analyzing the structure of Gen, refering to the strcture of NO-NSAIDs which has the function to release NO slowly, we got a target compound by esterification and nitration reaction. The structure of this new compound was confirmed by nuclear magnetic resonance, infrared spectrum and mass spectrometry.

研究方法 1。 NO-G的结构设计、合成及鉴定分析Gen的结构，参照NO-NSAIDs的结构设计，采用化学合成的方法经酯化反应和硝基化反应得到目标化合物，通过核磁，红外和质谱分析对得到的化合物进行结构确证。

Concentration measurement of NO gas by folded BOXCARS

对 NO气体的特性进行了研究，在不同浓度下，得到了 NO气体对光的吸收谱和某一波长下 NO气体吸收率随气体浓度、光程的变化特性。

Investigating the adsorption and decomposition of NO and NO〓 on the Ag/Pt (110) surface.

研究了NO和NO〓在Ag/Pt(110)表面的吸附和分解。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。