边界条件

One of the most important measures that are used to make TWT work stably and reliably is to suppress all kinds of self-oscillations, including BWO. On the basis of the coupled mode theory, considering the effects of attenuator/sever, taper/step phase velocity, voltage gradient of electron beam, etc.

本论文基于耦合模理论，全面地考虑了衰减器/切断、相速渐变/跳变和电子注的电位梯度等的影响，建立了抑制返波振荡的统一的自洽线性工作方程组，包括线路方程、运动方程和电流连续性方程，并给出了相应的边界条件。

For aiming at vibration-proof structural design,a bionic design technique of topology design optimization for vibration-proof plate and shell structures is suggested.

以抗振结构设计为目标，将仿生设计技术应用于板壳结构加强部件的分布设计中，提出了一种简单高效的结构拓扑优化设计方法，以处理具有复杂边界条件的抗振板壳结构的拓扑优化设计。

But the same time for guaranteeing mode curve satisfy the whole boundary condition , at other vibration direction the waveform number isn t only.

在两个振动方向上所采用的振动曲线形态要与相应的边界条件所限定的变形形态相吻合。

Against the background of wind-induced vibration of the H-shaped hangers of steel truss arch bridges,this paper analyzes the degree of influences of the Reynolds number Re,vibration factor ξ,stress magnitude,stress state,boundary conditions and sectional shapes of hangers on the vibration of the hangers of the steel truss arch bridges.

以钢桁拱桥的H型吊杆的风致振动为工程背景，分析了吊杆的雷诺数Re、振动因子ξ、应力大小及应力状态、边界条件、断面形状对钢桁拱桥吊杆振动的影响程度。

Against the background of wind-induced vibration of the H-shaped hanger s of steel truss arch bridges,this paper analyzes the degree of influences of the Reynolds number Re,vibration factor ξ,stress magnitude,stress state,boundary conditions and sectional shapes of hanger s on the vibration of the hanger s of the steel truss arch bridges.

以钢桁拱桥的H型吊杆的风致振动为工程背景，分析了吊杆的雷诺数Re、振动因子ξ、应力大小及应力状态、边界条件、断面形状对钢桁拱桥吊杆振动的影响程度。

On the basis, the influences of dimensionless apparent permeability variation factor and boundary conditions to pressure behavior have been analyzed.

在此基础上，分析无因次表观渗透率变化系数和边界条件对压力动态的影响。

Based on the characteristics of phasing switch, the dielectric recovery characteristics for short gap vacuum arc were discussed, a vapor density model was applied under the special boundary conditions to get some relations between arcing time and the surface temperature, vapor density.

讨论了真空短间隙及其对应的短燃弧时间对相控真空开关介质恢复特性的影响，应用金属蒸汽密度模型和不同的间隙边界条件，得到燃弧时间与电极表面温度、金属蒸汽密度的关系。

A new calculation model of three dimensional short foil was used to simulate the phenomenon of tip vortex and its roll up.

由端部及尾涡面上的运动学边界条件来确定端部梢涡及涡面卷曲形状。

4Based on the analysis above, a local finite element model of the united-arch-feet three-span continuous through type bow-string arch bridge is established and analyzed. The simplification of the external force and the boundary displacement, the internal relation between local analysis and whole analysis, the analytic method of partial nodes are discussed. Suggestion is made for the design and construction of this kind of bridges, insuring the structure safety.

在静力分析的基础上，对三跨连续下承式系杆拱桥的拱脚结合部位进行局部应力分析，探讨了局部节点分析的外力和位移边界条件的简化，局部分析和整体分析的内在联系，局部节点分析的方法等，避免设计的盲目性，对今后此类桥梁的设计、施工提供建设性的意见和建议，确保结构安全。

The proposed method is applicable for the thin-walled member of any cross section with any boundary condition.

本方法适用于任意横截面形状和任意边界条件的薄壁杆件。

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。