比较原理

this paper analyses the basic principle of tpc,compares the error performance in the system which has been applied with tpc with the uncoded system,studies the influences which different block codes and iterative numbers to tpc decode performance.under the circumstances of different iteration numbers and block codes,experiment simulation is carried on.the simulation results indicate that introduction of tpc can get the code gain of 5~6 db.tpc decoding algorithm is simple,and doesn′t have the error floor,the complexity of its hardware implementation is smaller,it is a kind of practical channel coding method.

摘 要：在分析turbo 乘积码的基本编译码原理的基础上，比较了未编码与编码后系统的差错性能，研究了选取不同分量码、不同迭代次数对tpc译码性能的影响。在不同迭代次数与分量码情况下，进行了仿真实验。仿真实验表明，在相同的差错性能条件下，采用tpc码能带来5~6 db的编码增益。tpc译码算法简单，没有错误平层，硬件实现复杂度较小，是一种非常实用的信道编码方式。

Firstly, all of univariant line equations are attained; secondly, a crossing point (φ i , pH i ) is got by solving univariant line equations including a main component one another; thirdly,φ i is compared with the chemical potentials φ of other components in this crossing point by chemical potentials minimization.

提出了一种新的绘制φ—pH 图的方法，即先求出所有的单变线方程，再选取某一种组分Mi 为主组分，把含有该组分的所有单变线方程两两求解，求出交点，然后用化学势约束原理法，将主组分同其它组分在该点的化学势作比较，若前者的化学势小于后者，则该点为所求的三相点。

With time, the market, even the entire country, would start to believe that " the grass IS always greener on the other side", culminating in a vicious cycle where locals become increasingly cheapened, and foreigners become unjustifiably expensive.

久而久之，整个市场，甚至国家，都会不经意地相信&外国的月亮永远比较圆&的原理。形成一个不健康的恶性循环，导致本地货的评价，越来越低，而外国货，无故涨价。

For strong convective weather , it classified all historical sample events into 4 weather patterns (like northwest , trough area ,west wind and southwest current), established 4 characteristic fields of 400hPa height of HLAFS , then according to the principle of the pattern match calculate and compare the real-time HLAFS forecast products-2-using the similar method inside the big and small key areas , establish forecast equation , finally gain conclusion .To duststrom weather, the historical samples were sorted into duststrom and severe duststrom types in 5 regions (they are whole area, west, central, middle-west and middle-east of Inner Mongolia ),moreover set up different sample databases about ECMWF fields (including 500hPa height, 850hPatemperature and sea-level pressure).In order to making duststrom forecast at different time level , we first filtered the real-time data by FAX data ,and then used the method of similar range degree to compare the historical data to the actual data of ECMWF .To precipitation weather ,they were divided into 2 types that suit or unsuit airplane artificial precipitation stimulation in line with their emergence time and district .The appropriate weather physical factors come from T106 were chosen to establish the artificial precipitation stimulation prediction model . In the actual application , we can get prediction result as long as use the real-time forecast data of T213 in the prediction model .

针对强对流天气将历史样本天气分为西北气流型、槽区型、西风气流型和西南气流型等4个类型，并建立其HLAFS资料400hPa四种特征场，按照模板匹配的原理，用相似分析方法在大、小两个关键区中对实时HLAFS预报产品进行计算、比较，再建立预报方程，得出结论；对沙尘暴天气将其按区域分为全区、西部、中部、中西部以及中东部5类，再按强弱分别分为强和一般2类，建立ECMWF的3个场(500hPa高度场、850hPa温度场和海平面气压场)的历史资料库，在用传真资料消空之后，用相似离度方法计算实时ECMWF资料，做出不同时次的预报；对降水天气按出现时间和区域分为适合和不适合飞机增雨作业2类，选择T106资料中恰当的气象物理量因子，用BP神经网络算法建立人工增雨降水预报模型，实际应用中将实时T213相关预报资料代入预报模型即可。

A detection method for welding lines based on K-L algorithm is discussed. Infrared light source is applied to get high quality images of welding lines through CCD. Image template libraries for unwelded and welded lines are constructed and the welding line image is processed by K-L algorithm to match with the template libraries to judge if the welding line has been welded. The experiment shows that above method is effective with high precision and speed and it can be applied on real-time detection of welding lines.

提出计算机对所得图像进行滤波和图像分割，讨论了K-L算法的原理及其在红外焊缝图像检测中的应用；以红外光源照射焊缝，通过CCD摄取焊缝的图像，建立已焊和未焊的图像模板库，采用K-L算法对焊缝图像进行处理，并与模板库进行比较，得出焊缝是否焊接的结论；试验结果表明，该方法检测精度高，检测速度快，可以实时运用于对手工电弧焊的焊缝质量检测中。

The basic principle, measurement characterization, application status and problems are illustrated specifically in this paper, the advantages/disadvantages of these techniques are analyzed for piezoelectric applications, and the results show that combining the high resolution of the interferometer and the surface scanning ability of laser scanning vibrometer may lead to a convenient, accurate and reliable method for assessing piezoelectric coefficient.

详细分析了这些方法的基本原理、测试表征、应用状况和存在的问题，比较了这些方法的优缺点。

Under the guidance of Marxist principles, this paper uses the laws of cause and effect analysis, comparative analysis and systemic analysis, with reference to the theories of related economics, management, cultural science and sociology. Basing on summarizing the current situation of Chinese enterprises" strategic development, this paper first analyses the influence of external environment such as traditional social structure and culture to enterprises" strategic development, then anatomies from the enterprises interior structure and lifecycle.

本文以马克思主义基本原理为指导，借鉴经济学、管理学、文化学和社会学等相关学科的理论，运用因果分析、比较分析、系统分析等多种分析方法，在对我国企业战略发展现状进行综述的基础上，首先分析了传统社会结构和传统文化等外部环境对企业战略发展人性化的影响；接着从企业自身内部结构和生命周期两方面进行深入剖析。

This article has selected three methods of weight calculation: single item index method of weight; synthesis index method of weight; entropy method of weight After the expatiation of theories and means, we analyzed example by using the fuzzy comprehensive evaluation method baaed on these three kinds of methods of weight calculation, and then came to the conclusion through contrast: the first method is very sensitive to superscale; the other two methods, which consider more factors' influence, can generally reflect the real status of water quality, and the results are consistent and relatively better.

现选取了单项评价指标权重法、综合权重法以及熵权法三种不同的权重计算法，分别详述了其计算原理和方法，并在基于这三种权重计算法的基础上采用模糊综合评判法对实例进行分析，最终通过对比得出结论：基于单项评价指标权重法的模糊综合评判法对单个超标因子比较敏感；基于综合权重法和熵权法的模糊综合评判法则综合考虑了各个指标因子对评价结果的影响，能够较全面的反映水质的实际情况，评价结果几乎一致，且相对较好。

Compared with Star Test, Hartmann and Interferometer etc, the testing method of this project needs no work reference benchmark given by beaconing or standard large plane mirror, and its principle is novelty.

该方案的检测方法与经典的星点法、哈特曼法等以及干涉法相比较，原理新颖，也不需任何外部信标或标准大平面反射镜提供工作参考基准。

Introduces basic principles,operating procedures and sealing agent s types of conventional caulking by repairing welding method and recently often used non-stopping pressurized caulking technologies,and it compares both of them.

介绍了传统的焊补法堵漏及目前常用的不停车带压堵漏技术的基本原理、操作步骤以及密封剂类型，并对两种方法进行了比较。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。