Simulation results showed that the new method can improve the system throughput , obtain higher transmit power utilization and decrease the number of invalid sub - channels without additional complexity when compared with the conventional power allocation algorithm 仿真结果表明，在准静态平坦衰落信道下，与传统算法（如注水算法）相比，新算法能进一步改善系统的吞吐量，提高发射功率的使用效率，减少不可用子信道个数，且无附加复杂度。
By using finite element method , the thesis analyses the problem of quasi - static and dynamic meshing . its research mainly contains : 1 、 gain precise geometric information of the spiral bevel gear from adjustment block of gleason machine tool , then form relevant cad format files 本文以有限元法为基本手段,研究了螺旋锥齿轮啮合过程中的准静态和动态啮合问题,主要的工作包括: 1 、基于gleason机床调整卡获得螺旋锥齿轮的精确几何信息,形成相应的cad格式文件。
5 ) the 3 - d geometry and finite element model of the assembly of the optimized obturator of the breech mechanism is set up in terms of the optimized structural parameters . quasi - static and dynamic finite element analysis of stiffness , strength and obturating performance of the optimized obturator of the breech me chanism is performed 利用优化后的结构参数建立了优化后炮闩闭气结构的装配体三维几何实体模型和有限元模型，对优化后的炮闩闭气结构刚强度和闭气性能进行了准静态及动态多体接触弹塑性有限元分析。
In this paper , they are set forth at first that the kinds of computer - simulation of electronic devices , the development and the requirements of mosfet ' s model and the way of gain the models " parameters , , the dc models have been bui it in chapter 2 and the models of big signals have been deduced in chapter 3 , they are different from the equivalent circuit models in the traditional software pspice that they come from the numer i ca i - s i mu i at i on wh i ch is based on the essence equat i on , so the precision of simulation is enhanced ? mosfet ' s small signal models of low frequency , intermediate frequency and high frequency have been built in chapter 4 and chapter 5 , although the equivalent circuit models in pspice are used for reference to bui id them , they have their own characteristics which are analyzed at a i i kinds of situations , so that the simulation software for mosfet can be written according them and it i s a i so benef i c i a i for us to catch the gen i us character i st i cs of mosfet and to d esign all kinds of applicable devices the correctness of the models is simply proved in chapter 6 本文首先介绍了电子器件计算机模拟的分类、 mosfet的建模发展动态、对器件模型的要求以及模型参数的提取方法。在第二章中建立了mos晶体管在直流端电压条件下的工作模型；第三章推导了mosfet的大信号模型，这两类模型不同于传统模拟软件例如pspice中的等效电路模型，而是从模型方程出发，采用数值模拟的方法，提高了模拟的精度。第四章和第五章分别建立了mos晶体管低频、中频、高频的小信号模型，虽然借鉴了pspice模拟软件中用等效电路模型的方法，但是本文分别讨论了准静态和非准静态时器件的本征部分以及包含非本征部分工作于低频、中频和高频条件时的模型，可以根据这些模型编写相应的模拟软件，这样在做器件的模拟分析与器件设计的时候，就可以利用模拟软件逐步深入地分析器件在不同的条件下和器件的不同部分在工作时的各种小信号特性，有利于抓住器件工作的本质特性，设计出符合要求的各类通用和特殊器件。
In this thesis , studies are made on the problem of time - harmonic electromagnetic fields excited by an arbitrary current dipole in spherical conductor . the problem is presented in eddy - current nondestructive test and geophysical prospecting . under the condition of magnetic quasi - static state , the boundary - value problem about modified magnetic vector potential is solved and the analytical solution is obtained 本论文针对涡流无损检测和地球物理勘探领域用到的球导体中时谐电流元的电磁问题做了研究，在磁准静态近似下，求解了修正磁矢量位的边值问题，获得了问题的解析解，并利用通用有限元分析软件做了数值验证。
With the concept of equivalent conductivity plate , we presented a calculating method for the interactions among particles in a single chain and among chains in anonpolar liquid . thus the interactions in a single chain and in different 2d structure is obtained . further , we get their stress - strain relationship . the results show the interactions among chains significantly enhanced the anti - shear capacities of er fluids 用等效电导平板建立了非极性液体中单链粒子之间以及链与链之间相互作用力的计算方法.分别计算了单链、平面密排结构、平面矩排结构的准静态应力应变关系和屈服应力.通过和单链结构比较发现,平面密排结构中链链之间的相互作用力使结构的屈服应力(平均到每条链)增大,且随着链数的增加,增强作用显著
Through the coding , control and transmission of every vob sequences , the system not only gains the higher compress ratio but also has new functions such as automatically giving alert and fast retrieval by roi etc . every part of the technique implementation is discussed in this thesis , such as moving object detection and segmentation , video roi decomposition and composition , vob sequence coding and decoding , and feature - retaining sampling etc . beyond that , in this paper , a quasi - still - background monitor system and information network is described 论文详细论述了构成整个技术的每个部分，包括动目标的检测与分割，视频roi分解及合成， vob序列的编解码，以及保持应用特征的采样等几个方面。此外，在本文中还描述一个基于该技术的准静态场景监视系统信息网络的设计思想和基本工作原理，对其中的每个部分都做了详细论述。
Abstract : a previously proposed approximate quasi - static theoretical method is employed herein to examine the deformation and perforation of a simply - supported circular plate struck by a flat - faced projectile at normal incidence . based on the principle of virtual work , static load - displacement relationships are first obtained and then used to predict the energy - absorbing capacity of the plate subjected to relatively low speed impact . it is shown that good agreement is obtained between the theoretical predictions and the available experimental data , provided that adiabatic shear plugging failure does not occur , but the influence of strain rate sensitivity is taken into account 文摘:采用准静态近似理论方法分析简支圆板在平头弹丸正撞下的变形和穿透.首先基于虚功原理得到了静态荷载位移关系,并将其用于预测低速冲击下圆板的能量吸收能力.当考虑了材料的应变率敏感性,并且不发生绝热剪切冲塞破坏的前提下,理论预测和实验结果吻合良好
3 ) a 3 - d geometry and finite element model of the assembly of the obturator of the breech mechanism is established . quasi - static and dynamic finite element analysis of stiffness , strength and obturating performance of the obturator of the breech mechanism is carried out , based on elastoplastic theory and multi - body contact algorithm , and the simulation results coincide with experimental results , further , th e effect of friction factor on its obturating performance is investigated 建立了炮闩闭气结构的三维装配体几何实体模型和有限元模型，对炮闩闭气结构刚强度和闭气性能进行了准静态及动态多体接触弹塑性有限元分析，分析结果与试验结果相吻合，进一步研究了摩擦系数对其闭气性能的影响。
