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Firstly, according to the effect of the integration time constant of three-phase PFC controlled by one-cycle control, the single and triple integrator realization are compared, and how to determine the value of the time constant is investigated theoretically from the view of switch voltage stress and system stability.

针对三相PFC中积分时间常数的影响，分别讨论了三积分器实现方案与单积分器实现方案中积分时间常数变化对功率因数校正效果的影响，并从开关电压应力和系统稳定性的角度讨论了积分时间常数的确定原则。

Destructive interference hasbeen extensively studied both theoretically and experimentally,whereas only a fewstudies have been carried out for constructive interference.

目前，人们已从理论和实验上对相干相消进行了大量的研究，而相干相长的研究却很少。

In this thesis,we try to theoretically and experimentally investigate quantuminterference in atomic multi-level system and atom-molecule hybrid system to findthe conditions for generating quantum interference,the constructive or destructivefeature of interference,and the dependence of quantum interference on theenvironmental conditions.

本文旨在从理论和实验两方面对以往较少涉及的原子及原子—分子混合体系中多能级系统量子干涉效应进行研究，并着重探索量子干涉产生的条件、干涉相长或相消特性及其对外界条件的依赖关系等。

Aiming at the problem of coal resource shortage per capita, and excessive exploitation as well as irrational utilization of coal, the optimum theory and sustainable utilization system was simulated theoretically and methodically based on the principles of efficiency and continuousness, and the social welfare function.

根据效率原则与可持续性原则，利用社会福利函数，从理论及方法上对煤炭资源的最佳耗竭及持续利用进行了系统模拟，并将模拟的变化趋势与近年的实际开采利用情况作了对比和分析。

The SEM poles have been calculated theoretically by using the iterative method and contour integral method so far, but the both methods have many defects.

为了从理论上得到散射体的极点，人们提出了许多的数值计算方法，如Newton迭代法，Muller迭代法和围线积分法等，但都存在种种缺陷。

ABSTRACT The convective heat mass transfer in porous media has been studied theoretically and experimentally in this paper.

本文对多孔介质中的对流传热传质问题进行了理论和实验研究。

Convergence behavior is analyzed and the performance is theoretically evaluated.

对於所提之适应性演算法，其收敛行为与理论效能，我们也做了完整的理论分析与验证。

Theoretically, we study convergence theorem of the learning algorithm and a lower bound of attraction basin.

计算机实验结果充分说明了学习算法的优越性。

At the same time, the immune programming algorithm based on register-stack structure is proved to be convergent theoretically.

同时，在理论上证明了基于寄存器—栈结构的免疫编程算法的全局收敛性。

We analyze it theoretically, and convert it into two convex programming problems.

本文对这一非凸问题进行了详细的理论分析，并将这一问题转化为两个凸规划问题。

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。