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Based on the basic law of electrostatics and the boundary-value problems of Poisson equation, two opposite thoughts of the study that electrets can either be designed to provide homogeneous electric fields or be designed to shield electric fields are discussed.

利用驻极体具有的可任意切割、拼装、黏接的特性，从静电学的基本规律及由泊松方程构成的静电边值问题出发，对驻极体既可对外提供电场又可设计为屏蔽电场的 2个相异思维的研究结果展开了讨论，从而，从理论上指出驻极体既可以制成提供均匀外场的材料又可以制成一种透气性静电屏蔽材料。

Gate recess is widely used in III-V compound transistors to modify the threshold voltage and optimize the device performance through adjusting the gate to channel distance.

闸极掘入是改变闸极与电流通道的距离而使截止电压改变，进而使电晶体的表现最佳化，闸极掘入的技术已经广泛的应用在三五族半导体里。

The theory is that electron launched by electron gun is inducted into discharge chamber with screen voltage attracting, gas will be charged by inputting RF power. Ion can be attracted by screen and accerlate voltage.

射频宽束离子源工作原理是利用电子发生器产生电子，在屏极电压作用下把电子引入离化室，利用射频感应原理将能量耦合到离化室，再利用气体放电原理产生等离子体，在屏极和加速极的作用下引出离子束。

The bright OH masers are excellent probes of different kinds of astronomical objects in the Galaxy and even of distant galaxies, but the difficulties in identifying the pumping mechanisms of these OH masers and modeling them have hindered the application of this excellent probe.

明亮的OH脉泽是探测银河系中各类天体甚至河外星系的极好工具，但是对OH脉泽的抽运机制的鉴别和模拟上的困难使得这个极好工具一直没有得到极好的发挥。

A series of new isoxazolines were prepared by 1,3-dipolar cycloaddition between different mono-substituted styrenes and new 1,3-dipolar compounds which were synthesized by the reaction of N-methylhydroxylamine sulfate with aromatic carbonyl compounds.

以N-甲羟胺硫酸盐和芳香族羰基化合物为主要原料合成了一系列不同的1，3-偶极化合物，并合成了四种不同的单取代苯乙烯。以该系列1，3-偶极化合物和单取代苯乙烯为主要中间体，采用1，3-偶极环加成反应合成了一系列异恶唑啉类新化合物。

The results showed that there was most distinct difference in rooting rate among seedling varieties, rooting substrates, among them, substrate mixed with cultivate soil and peat soil in proportion of 7-3 was the best one , 500mg/l NAA and IBA solutions had no distinct effect on enhance rooting, covered with plastic membrane had most distinct excelled to which covered none.

结果表明，不同苗木品种的生根成活率差异极显著；不同基质的生根成活率差异极显著，其中以耕作土加泥炭土按7：3混合的基质效果最好；500mg/l NAA和IBA溶液处理对生根没有显著作用，扦插后覆盖塑料薄膜的生根效果极显著优于不覆盖薄膜处理。

The results indicated that MDA of both the radicles and cotyledons increased extremely significantly under the low and the high temperature treatments compared with the control, whereas the SOD activities decreased.

结果表明：温度胁迫使胚根中TSP含量均较常温显著或极显著降低，子叶中的TSP含量在低温处理下极显著高于对照，而在高温下与之相反；温度胁迫下，各豇豆品种胚根和子叶中MDA含量均较显著或极显著高于对照；SOD活性变化与之相反，但品种间有差异。

We performed a simulative test, which confirms that wavelet analysis can separate annual wobble and Chandler wobble. Our results show that this method can be used in astronomical geodynamies effectively. This paper is divided into two parts. The first is about statistic characteristic of polar motion. Polar motion includes secular motion, long period fluctuations, Chandler wobble, annual wobble and high frequency wobble. The secular motion is 3.4mas/year and towards 760W meridian. Long period fluctuations have difference periods in x-axis and y-axis. They are 31.7-year and 24-year in x-axis and 28.5-year and 22.9-year in y-axis. These 2~? decades fluctuations have an amplitude of about 30 mas , and are very nearly linearly polarized, with the observed motion of pole being almost entirely along a line between 360E and 1440W. There is a 55.4-year wobble whose amplitude is 9 mas. The amplitude of the interannual fluctuations is about 4? mas. The amplitude of long period fluctuations decreased after 1970. The annual wobble is a steady wobble. It retrograde wobble is only 1/20 of prograde wobble in amplitude.

本文的工作主要分为两部分：第一部分是通过分析POLE97序列，我们对极移的统计特性有了一个较全面的认识，极移主要包括趋势项、长周期项、Chandler项、周年项和高频项：趋势项的方向是西经76°，速度为每年3.4mas；长周期项中Markowitz 项在X、Y两个方向有不同的周期，它们分别是：X方向的两个周期是31.7年和24 年，Y方向的两个周期为28.5年和22.9年它们叠加在一起是一个线偏振运动，最大振幅约为30mas，偏振方向在西经144°和东经36°之间；极移的长周期波动中还存在一个 55.4年周期的圆周运动，振幅约为9mas；十年尺度变化的振幅在4～6mas之间，在Y 方向十年尺度的成份比较多，它们的周期在X方向和Y方向不是对应的；从七十年代年开始长周期变化的振幅明显降低；周年项是一个振幅稳定的摆动，在X、Y两个方向的振幅略有差别，逆向运动振幅大约为顺向运动振幅的1/20；Chandler摆动的振幅自1900年以来经历了几次较大的变化，其中包括1915年和1955年两次极大值，振幅分别达到0&。25和0&。28，以及1925～1940期间小于0.09的过程，Chandler项在X、Y 两个方向的振幅几乎完全相等，其逆向运动振幅不到顺向运动振幅的1/50。

Their risk of having very early preemies, the babies least likely to survive, dropped even more.

她们生下极早期极低体重儿的危险减小了甚至更多，这种极低体重儿基本不可能存活。

These results show that the choice of pole number and slot number has a significant effect on the performance and the proper choice of the pole-slot number combination and pole embrace can weaken the effect of output voltage harmonics and reduce usage of magnet material,as well as save cost,which are helpful to obtain the better performance.

结果表明：极槽匹配对直驱式风力永磁发电机性能有很大影响；通过合理选择极数、槽数以及极弧系数，可以减少输出电压谐波分量的影响，降低永磁材料的使用，节省成本，有助于直驱式风力永磁发电机获得良好的性能。

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。