交流分析

The degradation characteristics of ZnO-glass varistors have it's own features. For the first time, degradation phenomena of varistors under direct biasing, alternative field and pulse current are examined respectively in this thesis.

ZnO-玻璃系压敏电阻的老化有其自身的特点，论文首先分析了压敏电阻在直流、交流和脉冲电流作用下的老化实验现象，在此基础上，分析了各种条件下的老化机制。

With the background of prehistoric media ecology, this paper, starting with prehistoric non-language media, analyzed its physical and symbol form and their change traces, which includes the analysis on pictures on rock, dance, balefire, drum and bamboo flute which only exist in prehistory.

以史前非语言传播媒介为切入点，在史前媒介生态的背景下，分析史前非语言媒介的物理形态和符号形态，以及各种形态的演变轨迹，包括史前特有的岩画、舞蹈、烽火、结绳、鼓、笛等传播媒介的分析，从中探讨史前非语言媒介对人类思维及交流活动产生的影响。

A decalcomania process for MEA fabrication was also used as the other experiment. Kinetic analysis of the electro-active surface including ac impedance was executed for the two processes.

另一个实验，以转印制程制作的MEA来作为对照，利用分析电流电压性能曲线、动力学参数、电触媒活性表面和交流阻抗分析来比较此两种制程制作的MEA性能。

T the point of the engineering application, it includes the construction static analysis, construction dynamic analysis, flexuosity analysis, and thermal analysis etc.

NSYS用户涵盖了机械、航空航天、能源、交通运输、土木建筑、水利、电子、地矿、生物医学、教学科研等众多领域。ANSYS是这些领域进行国际国内分析设计技术交流的主要分析平台。

According to the requirements for alternating current sampling, four feasible schemes (full-wave rectification, double 4051, raised analog ground and adder technique) are systematically contrasted in this dissertation. The hardware and software of this instrument are also analyzed in great detail.

本文围绕交流直接采样的技术要求，详细地对比分析了四种可行性设计方案，其中包括全波整流、双4051、模拟地抬高及加法器方式，并对其硬件实现和软件编程进行了详细的分析与论证。

The author firstly combs the teachers sources of Shuyuan in Ming and Qing dynasties, points out that there are four main sources for it, and concludes that making full use of social resources is a valid path to solve the problem of teachers sources then.Secondly, the present research consults Shuyuan teachers employment way in Ming and Qing dynasties, combs its three ways and deeply inquires into the subjective and objective condition for them.Thirdly, the present research analyses Shuyuan teaching characteristics, management and promotion, sums up seven main teaching characteristics and analyses the advantage and disadvantage of them,Further more , the present research consults Shuyuan teachers management and promotion, makes an analysis on its historic courses why it"s informal.Finally, the present research analyses the Shuyuan teachers" economic treatment, social status and the influence and effect made to the politics, economy, military, social life and cultural education where they were situated in Ming and Qing dynasties, and concludes that the Shuyuan teachers in Ming and Qing dynasties actively participated in the local social activities in their peculiar upper class gentlemanship and greatly influenced and promoted the policy making and carrying out of the local public affairs, meanwhile, they promoted the communication and development of local learning and culture , and trained quite many men for profession for the locals.

作者首先对明清时期书院教师的来源进行了梳理，指出了明清书院教师的四种主要来源，认为充分利用社会资源是明清书院解决教师来源的有效途径；其次，对明清时期书院教师的聘用方式进行了历史考察，梳理出明清时期书院存在着三种教师聘用方式，深入探讨了这三种方式并存的主客观条件；再次，对明清时期书院教师的教学特点进行了分析，归纳出七个主要教学特点，并说明其利弊；此外，探讨了明清时期书院教师的管理及升迁问题，分析了其存在的不规范性的历史原因；最后，剖析了明清时期书院教师的经济待遇、社会地位及对书院所在地的政治、经济、军事及社会生活与文化教育所可能产生的作用与影响，得出明清书院教师以自己特有的上层绅士身份与地位积极地参与到当地社会生活之中，并在相当程度上影响与促进了地方公共事务的决策与实施；同时，他们促进了当地学术及文化的交流与发展，为当地培养出了大批的杰出人才。

Firstly, the transient stability of the modes by which some kinds of huge power suppliers are connected with AC power grid is analyzed and compared in detail; then a detailed transient stability simulation of a certain large-scale demonstration system is performed; finally some helpful conclusions are obtained: in the general situation, the bundling power transmission mode is favorable to increase the stability of sending system; if it is helpful to evidently increase the inertia of the equivalent leading group, the mode that connects the huge power supplier with sending system will be helpful to enhance the stability of sending system, however it is necessary to perform simulation and analysis while these principles are applied to FACT systems.

首先从机制上对几种大电源接入交流系统方式的暂态稳定性进行了详细的分析和比较；然后对大型算例系统进行了详尽的暂态稳定仿真；最终得出了一些有用的结论：一般情况下，打捆送电方式有利于提高送出系统的稳定性；如果有助于显著增加领前群的惯量，则与送端系统相联的方式也有助于提高送电系统的稳定性，但仍要结合具体系统进行分析。

The gap of our country in this field is filled in. 5. The performance fade of general room-temperature bipolar junction transistor at low temperature is simulated, for instance, the current gain, the cut-off frequency, the base resistance and the base-to-emitter capacitance.

以PISCES—2B中的模拟实例——二极管为例，阐述了所开发的半导体器件模拟软件包SE-PISCES的性能，可进行50K-350K下的稳态分析、瞬态分析和交流小信号分析。

To solve the problem, a method used to analyze the proximity effect in rectangular loss transmission line is proposed and applined in full transverse electromagnetic frecuency Additionally, AC resistances are calculated to correct the parameters in telegraphist's equation, so it is feasible to do transmission characteristics analysis in wide band.

针对传统磁准静态方法无法进行高频段邻近效应分析的缺陷，提出一种可适用于横电磁波下整个频段的矩形有损传输线邻近效应分析方法，并推导了邻近效应影响下的交流阻抗，进而对电报方程的阻抗参数进行修正，为宽频域信号传输特性分析提供了新思路。

The results obtained revealed that:(1) the Pacific yellowfin has larger ring-radii as well as scale size than the Indian Yellowfin;(2) the specimens from the western Indian have larger value in scale size and ring-radii than those from eastern Indian;(3) there is a significant difference in the estimated growth curves between male and female for the Pacific specimens, but not for the Indian specimens; and (4) it is convinced that there are two yellowfin groups in the Indian Ocean, viz., one concentrates in the western Indian and the other densely distributes in the waters around Sunda Islands and Banda Sea; intermingling of these two groups is supposed to be occurred around 100°E in the season of northern summer.

3李氏现象在太平洋和印度洋都很显著。(4)年轮每年形成二次，时间为2～4月及8～10月。(5)有关成长的parameters如下：太平洋K=0.386 L=174.9 t0=0.05 东印度洋 K=0.278 L=212.7 t0=-0.19 中印度洋 K=0.290 L=215.6 t0=-0.01 西印度洋 K=0.349 L=191.1 t0=0.06 (6)由钓获率的分布、体长组成和其他生物学资料及以往之结果加以综合分析，显示印度洋的黄鳍鲔可分为东、西两个族羣，一为以班达海和小巽他羣岛附近海域为中心的东方羣，另一则以西部印度洋赤道流域为中心的西方羣。此两羣在100°E附近发生混合交流。当北半球的夏天时，此混合交流的现象较为显著。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。