滞后的

The converter combines the advantages of the PWM technique and soft-switching technique, the PWM is effected all over the whole loads range, and soft-switching is effeted only in the switching transition period, the ZVS of leading-leg is achieved by using the energy stored in leakage inductor of the transformer and the output inductor, the ZCS of lagging-leg is achieved by using a blocking DC capacitor, the ZVS and ZCS are achieved for the whole load ranges (5A~250A).

控制电路采用相移控制方式，综合了PWM控制和软开关技术的优点，在大范围内实现PWM控制，而在功率器件换流期间实现软开关换流，其中超前桥臂利用变压器的漏感，实现了零电压开关，滞后桥臂利用隔直电容，实现了零电流开关，并且整个变换电路能在（5A~250A）的范围内实现软开关工作条件，满足弧焊电源负载变化大的特点。

In the dissertation, principles of phase-shifted full-bridge ZVS PWM and push-pull boost converter are analyzed; Reason of duty ratio dropping out and solution measures are introduced at the same time; The magnetic biasing and ZVS methods of Lagging brachium are studied detailedly in the bidirectional DC converters.

在本文中首先分析了移相全桥式ZVS-PWM功率变换和推挽式DC／DC Boost功率变换的工作原理，分析了移相全桥式滞后臂实现零电压关断困难以及占空比丢失的原因以及采取相应的改善措施，分析了双向DC／DC变换器产生偏磁的原因以及采取抗偏磁的措施。

Corporations get victory by business culture in 21 century, but Chinese state electric power corporation business culture drop behind the corporation's other aspect and the era, for this matter, Chinese state electric power corporation by any possibility on bad situation in competition.

21世纪是文化致胜的时代，而我国国有电力企业的文化建设已严重滞后于时代和企业其他方面的发展，企业文化的落后已经影响到国有电力企业管理水平的提高，将会使其在竞争中处于不利地位。

Therefore, the time delay estimation of a signal can be obtained based on the correlative principle of periodic series -- circular correlation.

在时延估计的广义相关法中[1 10]，滤波后的传感器输出是互相关的，并将互相关估计取峰值时的滞后取作时延的估计。

Based on analyzing and comparison of the several kings of theoretical formula and analyzing the composition and influence factor, this paper improves a common formula used in calculating jacking force in pipe jacking.

本文针对当前非开挖技术基础理论研究滞后于工程实践的现实，对顶管的推力理论、水平定向钻进的管道回拖力及其水平钻进过程中的孔壁失稳机理等问题进行了研究。

The author explores the following questions:"rigid understanding the relationship between the teaching of knowledge and the cultivation of students' capabilities","the passive influences to the historical teaching at middle school brought by the controversy between the falling behind of the teaching stuff and the rapid knowledge update","the lack of originality of researching topics, the weakness of the consciousness of research, the confusion of pedagogical ideas and the inappropriate inclination in teaching practices", and so on.

笔者从"僵化理解知识传授与能力培养的关系"、"教科书内容的滞后和知识更新的矛盾对中学历史教学的消极影响"、"科研选题创造性不足，问题意识不强，教育学概念混淆以及教学实践中的错误倾向"等中学历史教学诸如此类问题进行了分析，并探讨了解决对策。

Part four summarizes the success and failure of the villages and towns system reform for the past more than 20 years.The accomplishment is as follows: that is to say, to establish the system of country governments and village self management, to improve the function of villages and towns, to push the changeover of villages and towns' function and style,to reduce and control the number of the personals, to develop notably in socialist democracy; there exist six prominent problems, namely to be short of the right academic direction during the system reform , to be lack of the right idea about reform, to orient the government function irrationally , to innovate the degree of system deficiently ,to lag in constructing legal system and to form a half-baked set in reform measure.

第四部分，在回顾的基础上，对二十多年来乡镇体制改革得失进行总结：成就主要表现在五个方面，即确立"乡政村治"体制、完善了乡镇功能、推动乡镇政府职能和作风的转变、减少和控制机构和人员的增加、民主政治取得可喜进展；存在六个突出问题，即体制改革缺乏正确理论指导、对改革缺乏正确认识、政府职能未有合理的定位、制度创新力度不够、法制建设滞后、改革措施不配套。

The result of frequency response analysis shows that when the modulation frequency of incident radiation increases, the phenomenon that the response of detector lagging behind the variation of radiation becomes evident, the temperature variation range in pyroelectric thin film decreases, but the variation velocity increases, so the current resulting from pyroelectric effect increases.

频率响应分析表明：随着入射辐射调制频率的增大，可以观察到探测器响应的滞后现象越来越明显，热释电薄膜中的温度变化范围减小，但变化速率增大，因此探测器的热释电电流增大。

The Putuo-District District educates the human resource the management the key problem that system application exsits has:Idea, the new technique cans not get the valid expansion;The work efficiency is low, repetition labor, data redundancy;The information renews the ability with the data low, respond the dilatoriness;The inner part shares the ability with the exterior information low;The human resource manages the personnel to is hard with system to match the etc., producing the reason of these problemses are: the personnel information management cant keep up with the reformed step of the system, the information turns developments lack to unify the programming with the roughly personnel information in character system that manage, the personnel turns development etc..

普陀区教育人力资源管理系统应用存在的主要问题有：观念滞后，新技术得不到有效推广；工作效率低，重复劳动，数据冗余；信息和数据更新能力低，反应迟缓；内部和外部信息共享能力低；人力资源管理人员与系统难以匹配等，产生这些问题的原因是：人事信息管理无法跟上体制的改革的步伐，信息化建设缺乏统一规划和管理，人员的素质制约人事信息化发展等。

Generalized predictive control is a kind of advance control methods that is of strong robustness, can overcome the time delay of system effectively and is suitable to unstable non-minimum phase system. But it has the shortcoming of large computation load because of online solving the Diophantine equation, inverse matrix and recursion solution by Least squares. So four kinds of fast algorithms of GPC that don't need the mathematical model of plant and are highly real-time are proposed in the paper. They have laid the rationale for the application of GPC to systems that need fast response.

广义预测控制是一种鲁棒性强、能够有效地克服系统滞后、可应用于开环不稳定非最小相位系统的先进控制算法，但由于它需要Diophantine方程计算、矩阵求逆和最小二乘的递推求解，因此计算量很大，本文针对此缺陷提出四种不基于对象模型且实时性高的广义预测控制快速算法，为广义预测控制应用于实时性要求高的快速系统奠定了理论基础，具体研究工作如下。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。