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Using this method proposed in this thesis, superplastic free bulging process of duralumin LY12CZ under an external electric field is analysed, both with the constant pressure and with the constant strain rate at the apex.

将此解析—数值混合分析法应用于LY12CZ铝合金在强电场中的超塑性自由胀形过程的数值模拟，其中包括恒定胀形压力和恒定应变速率两种情况。

In this paper, we at fist analyse the distribution of magnetic field in the permanent magnet synchronous motor which rate power is 800W and calculate parameters of this motor On t...

并在传统的计算电枢反应电抗的基础上提出了一种基于电势平衡方程式的计算方法，本论文称之为"电势法"。

For this reason, an optimal automatic timing control algorithm is proposed, that can restrain the switching frequency in a certain range to achieve the purpose of high efficiency and energy conservation. Taking such factors as inductive reactance at AC side, switching frequency, harmonic distortion rate and switching loss as well as the interaction among them into consideration, the formulas for inductive reactance and switching frequency are given; then by use of digital signal processor TMS320F2812, a prototype based on the proposed algorithm is implemented, and using this prototype the effectiveness and practicality of the proposed method are verified by experimental research and simulation.

文章提出了自动定时控制的优化算法，将开关频率限定在一定范围内，以达到高效节能的目的；综合考虑交流侧感抗、开关频率、谐波畸变率和开关损耗等指标，提出了主电路电感参数和开关频率的选择公式，并采用TMS320F2812数字信号处理器构造了试验样机，进行仿真和试验研究，其结果证明了该方法的有效性和实用性。

This project studies the scale-dependent deformation behavior of the metal matrix composite, the void nucleation and void growth mechanisms at the micron/submicron scale. The main results are:(1) In prophase, growth and coalescence of the void embedded in the graded matrix are analyzed in detailed;(2) Based on the infinite solid model containing a micro-void, coupling effects of the void shape and the void size on the void growth are studied carefully, the results show that it seems to exist a critical equivalent void radius, which is associated with the material length. When radius of a microvoid is close to or smaller than the critical void radius, the micro-void growth rate is essentially eliminated;(3) The coupling effects of the particle shape and size on the mesoscopic stress fields within the particle and matrix are also investigated by introducing the conception of inclusion/matrix interfacial energy. The results show that the stress concentration factors within the particle and on the matrix/particle interface are also strongly size-dependent,so the void nucleation mechanism is size-dependent.(4) By employing a specific orthogonal curve coordinate frame and a 'kernel function' conception, a 'unified method'solving the spheriodal and spherical void problems is suggested; by this unified method, size-dependent plastic potentials of the porous materials containing the spheriodal or spherical voids are obtained, which extend the traditional Gurson model for the spherical void and GLD model for the spheriodal voids to the micron scale.(5) Based on the RVE model containing the spheriodal or spherical particles, the influences of the particle shape and size on the size-dependent mechanical behavior of metal matrix composite are studied.

中文摘要：本项目对金属基复合材料在微细观尺度下的尺度相关变形行为、孔洞形核及长大的机理和模型进行了研究，取得了如下主要结果：1）在前期研究中，探讨了基体的梯度分布对孔洞长大和聚合的影响；2）基于含孔洞的无限大体模型，探讨了孔洞形状和孔洞尺寸对其长大的耦合作用，结果表明：可能存在一个与材料特征长度相关的临界孔洞尺寸，当椭球孔洞的等效半径小于临界孔洞半径时，孔洞的长大受到明显抑制；3）通过引入基体/夹杂界面能的概念，分析了夹杂尺寸、夹杂形状对材料细观应力场的耦合影响，结果表明：颗粒内部和界面上的应力集中因子强烈地依赖于夹杂的尺寸和形状，因此，孔洞的形核机理是尺寸相关的；4）采用一种特殊的正交曲线坐标系和引入"核函数"的概念，"统一"地得到了含椭球和球形孔洞的材料的尺寸相关塑性势，它将传统的Gurson球形孔洞模型和GLD椭球孔洞模型推广到微尺度范围；5）基于含椭球和球形夹杂的体胞模型，初步研究了夹杂形状、夹杂尺寸对金属基复合材料尺寸相关力学行为的影响。

Operator observes normal dropped-call statistics for one or two months, but then the dropped call rate starts to increase without having anything done to the network. Does this mean our analysis is not as meaningful as we envision it to be? This can be explained by looking at the subscriber growth trend.

但是在网络建设后期，用户量较大的情况下作网络分析时如果得出覆盖问题的结论通常局方不太认可，究其原因是：网络在一个月或两个月前掉话率指标还是正常的，当前网络覆盖状况和前阶段没有变化的前提下为什么掉话率指标会上升。

Gross of natural resources of water of catchment of the Yangtse River 996 billion stere, 35% what take the throughout the country, at present development utilization rate has 18% only, divide outside propping up this catchment to use water, still pass in carrying out south project of water north attune is northwardly provide fresh water resource, its moist limits involves 26 provinces city, shortage of gross of this pair of water, and distributing very not all China has fundamental strategic value.

长江流域水资源总量9960亿立方米，占全国的35%，目前开发利用率只有18%，除支撑本流域用水外，还通过实施中的南水北调工程向北方提供淡水资源，其润泽范围涉及26个省市，这对水总量短缺、且分布极为不均的中国具有重要的战略价值。

" Humble abode " Beijing area is achieved when channel of Beijing movie and TV broadcasts average the freeboard viewing rate of 8%, a paragraph of hero Guo Hai Ping's very classical in drama word:"Open everyday open one's eyes, a string of number skips a brain, the room is borrowed 6000, expenditure of food and clothing 2005, go up gradually nursery school 1005, favor come-and-go 600, traffic is expended 508, property administration fee 304, a stupid person of telephone bill of mobile phone phone, still have terminally water charge of electricity 200, that is to say, from me the first breath of come to begins, I enter Zhang at least everyday 400, this is the cost that I live in this big city."

蜗居》在北京影视频道播出时创下北京地区平均8%的超高收视率，主人公郭海萍在剧中非常经典的一段话："每天一睁开眼，就有一串数字蹦出脑海，房贷六千，吃穿用度二千五，冉冉上幼儿园一千五，人情往来六百，交通费五百八，物业管理费三百四、手机电话费二百五，还有每期水电费二百，也就是说，从我苏醒的第一个呼吸开始，我每天至少进账四百，这就是我生活在这个大城市的成本。"

Through analysing, we found that the average P/E ratio of industry, ROE, expenses rate are the factors influencing function to be relatively remarkable to company P/E ratio; The relations between company P/E ratio and such indexes as ROE, etc are all negative relevant, it is opposite to analyse with the theory, this kind of conclusion that completely contradicts proves the development of the stock market of our country is still at very unripe stage, the phenomenon that the high-quality stock is underestimated is serious, the whole market has even turned around; P/E ratio and net assets factor are in close relations, this includes the price of evaluation on net assets, rentability of the net assets, etc.

其次是对公司市盈率影响因素的分析，本文考虑了21个可能的影响因素，通过分析发现行业平均市盈率、净资产收益率、费用率等因素是对公司市盈率影响作用相对显著的因素；净资产收益率等指标与公司市盈率都是负的相关关系，与理论分析相反，这种截然相反的结论说明我国股市的发展还处于很不成熟的阶段，优质股票被低估的现象严重，整个市场甚至倒了过来；市盈率与净资产因子的关系密切，这包括了净资产的收益性、净资产的成长性以及股市上对净资产的评估价格等。

Our research set up a definite conception: if the rate of these surveyed university girls whose symptom of depression or severe depression is not severe, the 'depression' mentioned in this paper is a normal emotion status not have severe symptom. It is a common situation that will be effective by self-instructed adjustment, mental guide and mental intervening. This research will not take these diagnosed depression objects or even deeply ones into account Results tell us that 25.4% tested university girls who got depression, severe depression is rarely seen. T-test displays that the gender difference on depression between university boys and girls will be obvious at edge.

研究提出一个概念界定：检出的女大学生群体若不具有非常高的抑郁症或重度抑郁的比率，文中提及的"抑郁"就是不具备严重症状的正常范围的情绪状态，是通过有指导性的自我调整、心理疏导和心理干预就可以达到效果的普遍情况，本研究中不考虑对于确诊为抑郁症和重度抑郁的对象进行分析和讨论。

Aiming at the disadvantage of conventional BP neural network, such as selecting parameter values by the empirical method, slow convergence speed and easy trap into local minimum points, this paper designs an improved BP neural network system. In order to improve the network convergence rate and reduce the training error, this paper optimizes the initial connecting weight value of neural network by the use of ant colony algorithm and trains artificial neural network by Levenberg-Marquardt algorithm.

针对常规BP神经网络参数的经验式取值方法以及收敛速度慢，容易陷入局部最小点等缺陷，设计了一种改进的神经网络系统，利用蚁群算法优化神经网络连接权初值，并采用LM算法对人工神经网络进行训练，提高了网络的收敛速度，降低了训练误差。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。