使发生

Based on two kinds of control strategies of VSR under unbalanced grid condition,the introduction of a new VSR control strategy featuring undamped -oscillation that simplifies the controller structure and effectively improves VSR"s performance under unbalanced grid condition.· A systematic description of the state switching in trilogic PWM signal generation of three-phase CSR by using the conversion between bilogic and trilogic switching functions.· Referenced to the CSR"s trilogic PWM signal generation, an approach to achieve low-stress natural commutation of switching devices by reshuffling the vector composition sequence, resulting reduced switching loss.

在研究了两类电网不平衡时的VSR控制策略基础上，提出了一种新型的基于无阻尼振荡控制器的VSR不平衡控制策略，在简化控制结构的同时，有效地改善了电网不平衡时的VSR控制性能；·通过二、三值逻辑开关函数间的转换，系统地描述了三相CSR三值逻辑PWM信号发生中的状态切换；·结合三相CSR三值逻辑PWM信号发生规律，提出了通过调整矢量合成顺序而使功率管获得自然换相的低电压应力SVPWM控制，从而有效地降低了功率管的开关损耗。

Referenced to the CSR's trilogic PWM signal generation, an approach to achieve lowstress natural commutation of switching devices by reshuffling the vector composition sequence, resulting reduced switching loss. With the background of and well instanced by the Xinjiang Autonomous Region's Key SciTech Project"Solar Photovoltaic grid-connected inverter", the dissertation work implemented the new approach of a grid-connected PV inverter that was of single-phase VSR topology and with MPPT .

在研究了两类电网不平衡时的VSR控制策略基础上，提出了一种新型的基于无阻尼振荡控制器的VSR不平衡控制策略，在简化控制结构的同时，有效地改善了电网不平衡时的VSR控制性能；通过二、三值逻辑开关函数间的转换，系统地描述了三相CSR三值逻辑PWM信号发生中的状态切换；结合三相CSR三值逻辑PWM信号发生规律，提出了通过调整矢量合成顺序而使功率管获得自然换相的低电压应力SVPWM控制，从而有效地降低了功率管的开关损耗。

I not only thought these the pure Productions of Providence for my Support, but not doubting, but that there was more in the Place, I went all over that Part of the Island, where I had been before, peering in every Corner, and under every Rock, to see for more of it, but I could not find any; at last it occur'd to my Thoughts, that I had shook a Bag of Chickens Meat out in that Place, and then the Wonder began to cease; and I must confess, my religious Thankfulness to God's Providence began to abate too upon the Discovering that all this was nothing but what was common; tho' I ought to have been as thankful for so strange and unforseen Providence, as if it had been miraculous; for it was really the Work of Providence as to me, that should order or appoint, that 10 or 12 Grains of Corn should remain unspoil'd,(when the Rats had destroy'd all the rest,) as if it had been dropt from Heaven; as also, that I should throw it out in that particular Place, where it being in the Shade of a high Rock, it sprang up immediately; whereas, if I had thrown it anywhere else, at that Time, it had been burnt up and destroy'd.

当时，我不仅认为这些谷类都是老天为了让我活命而赐给我的，并且还相信岛上其他地方一定还有。于是，我在岛上搜遍了我曾经到过的地方，每个角落，每块岩石边我都查看了一遍，想找到麦穗和稻秆，可是，再也找不到了。最后，我终于想起，我曾经有一只放鸡饲料的袋子，我把里面剩下的谷壳抖到了岩壁下。这一想，我惊异的心情一扫而光。老实说，我认为这一切都是极其平常的事，所以我对上帝的感恩之情也随之减退了。然而，对发生这样的奇迹，对意料之外的天意，我还是应该感恩戴德的。老鼠吃掉了绝大部分谷粒，而仅存的十几颗竟然没有坏掉，仿佛从天上掉下来似的，发生这样的奇迹难道不是天意又是什么呢？再说，我把这十几颗谷粒不扔在其他地方，恰恰扔在岩壁下，因而遮住了太阳，使其很快长了出来；如果丢在别处，肯定早就给太阳晒死了，这难道不是天意吗？

After happening in a certain degree, the structure damage will have a bad effect on the load capacity and durability greatly or even cause the serious accidents. Thus, it caused not only the significant casualties and economic losses but also a very bad social influence.

水工结构在实际运营中，由于设计、施工等先天缺陷或者使用载荷超出设计以及遭受强大的突加外在荷载的作用会使结构物出现不同程度的损伤，结构发生损伤以后将严重影响结构的承载力及耐久性，甚至会发生严重的工程事故，不仅造成重大的人员伤亡和经济损失，而且还会产生极坏的社会影响。

The gravitation relation which the axis of rotation between moon and earth is out of the vertical has make the earth's crust move in sine curve and result in many mystery, such as reversion of magnetic field of the earth's crust, coal in South Pole, ice age of Africa, furthermore the continual earthquake which has occurred for more than 5,000,000 times on the earth.

月亮与地球自转轴不垂直的引力关系，使地壳弦动从而导致如地壳磁场逆转，南极有煤，非洲有冰川期等许多自然之谜的发生，更使得地球每年有500多万次大小地震的频繁发生。

And we also research the impact of methylating on hydrogen bond and stacked bond in base pairs under considering water molecules.

研究结果表明，烷基化之所以能造成碱基错配是它可使碱基的质子迁移或烯醇互变现象容易发生，改变原有原子的电荷分布或配对模式，同时碱基自身的互变异构体会跟烷基作用，致使互变异构体能够稳定存在，影响正常碱基配对，引起碱基诱变，造成生理疾病的发生。

On the foundation of the analysis,a fault diagnosis method which is an advanced pattern recognition method is proposed and a fault diagnosis system of generator excitation power unit based on virtual instrument is developed.It is proved by experiment that the fault diagnosis system can precisely judge which thirstier goes wrong and get accurate diagnosis result.

发生晶闸管直通故障时，瞬间将造成相电压短路，短路电流使保护电路动作；而发生晶闸管开路故障时(如晶闸管器件门极损坏或触发脉冲丢失等故障)，功率单元仍然工作，但输出励磁电压的脉动增大，平均值降低，这种带病工作导致励磁电压波形产生畸变，从而导致了发电机工作在不稳定状态，同时也加大了对电网的干扰[2]。

The electrolyte volatilizes and condenses in the aperture in anode, then partly hydrolyzes and dewater, then the stress are produced by expansion in this process. The expansion stress is the dominant cause of the graphite anode damage, and the oxidation of the active graphite particles on the anode surface is subsidiary for the anode damage. The measures of prolonging the anode service life are to enhance the quality of the anode such as increasing the forming pressure in the preparation and surface treatment before application.

认为石墨阳极的破损主要是由于石墨阳极中有比较多的孔隙，其中挥发进入石墨阳极表面孔隙的电解质吸水水解、脱水等过程发生膨胀，使周围的石墨颗粒应力不平衡而发生破损；其次是由于石墨阳极孔隙中活性高的石墨颗粒氧化。

The author has made researches on the social occurrence of man's functions of symbols and finds out that the occurrence of babies' self-consciousness is achieved under the conditions babies have possessed dualistic attention-----that is to say, attention can concentrate on two signal sources at the same time or it has two focus of attention.

论文摘要本文作者对人的符号功能的社会系统发生进行了研究，发现婴儿自我意识的发生是在婴儿已经具有二元注意--即注意力能同时集中到两个信号源或者说有两个集中点--的条件下实现的，这种并行性注意使一种称为反身性条件反射建立成为可能，并形成了具有符号功能的神经机能组织--二联体。

Based on qualitative analysis and comparison of several options for suppressing transverse vibration on deck type steel plate girder of railway bridge,conclusions are made as follows:with static reinforcing,the vibration amplitude can be suppressed to some extent,but quasi-resonance of the bridge can not be avoided,moreover,the construction is inconvenient and costly.

通过对目前抑制铁路上承式钢板梁桥横向振动的几种方案进行定性的分析和比较，认为：静力加固方案可以使桥梁振幅有所减小，但不能避免准共振现象的发生，而且工程造价较高，施工也不方便；两桥连接方案减振效果明显(减振率近50%)，比较经济也比较方便，但同样不能避免准共振现象的发生；动力减振方案可以有效的抑制桥梁的准共振现象(现场试验中减振率达51.83%)，而且工程造价较低，施工简单、方便。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。