滞后

In this paper, the stability problems of two forms about the discrete singular bilinear system with time-delay are investigated.

针对两类不同形式的滞后离散广义双线性系统的稳定控制问题进行了讨论。

The development of earthworm ecology was constrained by the complex feature of soil, the scarce knowledge of natural history and biogeography of earthworms, and the low efficiency of approaches in field manipulation of earthworm community.

土壤本身的复杂性，蚯蚓自然历史和生物地理学知识的缺乏，野外控制蚯蚓群落方法的滞后等都限制了蚯蚓生态学的发展。

There is about 3-month lag for the period between the maximum trend in temperature and that in NDVI at the country and biome scales.

植被对温度变化表现出3个月左右的滞后。2月份气温增加趋势最为显著，而5月份的NDVI增加趋势最为显著，且其速率最大。

The converter can be improved just by exchanging the position of the resonant inductance and the transformer such that the transformer is connected with the lagging leg. The improved converter has several advantages over its counterpart, e.g., the clamping diodes conduct only once in a switching period, and the resonant inductance current is smaller in zero state, leading to a higher efficiency and reduced duty cycle loss. The operation principle of the improved converter and the comparison with the original converter are analyzed in this paper. The effect of the blocking capacitor in series with the transformer or resonant inductance is discussed, and a best scheme is determined.The improved converter is adopted to design the DC/DC converter of secondary power supply in HVDC power system.

本文将谐振电感和变压器交换位置，使变压器与滞后桥臂相连，这样箝位二极管在一个开关周期中只导通一次，同时零状态时谐振电感电流较小，有利于提高变换效率和减小占空比丢失，本文分析改进后变换器的工作原理，并与改进前的变换器进行对比，讨论隔直电容在不同位置对变换器工作的影响，确定一种最佳工程方案。

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。

With the development of supply chain and e-commerce, the lag of logistics system has become the bottle-neck of the supply chain.

随着供应链和电子商务的发展，物流配送体系发展的滞后已经成为制约当前供应链向前发展的瓶颈。

We can say that the lag marketing development of a vast number of small and medium enterprises bottleneck.

可以说，营销工作的滞后成为广大中小企业的发展瓶颈。

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。

Using the way of document and logical analysis,the author deeply analysis the plan of our country's competitive callisthenics development,the result show that the content of nowadays development is suitable to our development situation and characteristic is a fast way,but the same time.We can see the problem of the slowness of our country's women sporters,so the author show some ways and suggestion to there problems.

运用文献资料法和逻辑分析法，对我国竞技健美操现行发展战略内容进行深入分析，结果表明：现行发展战略内容的制定符合我国竞技健美操发展现状和特点，是我国竞技健美操项目走向世界的一条捷径，同时也暴露出我国女性运动员竞技水平发展滞后的问题，笔者就此提出了解决方案与建议。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。