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Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

The Enter key can also be used to switch into and out of editing mode.

Enter 键也可以用来切换编辑模式的转换。

Regarding bad condition of oil, carbon powder and dust enter into Generator stator and dust enter excitor stator and high temperature of the excitor stator coil.

针对发电机静子漏进油、碳粉、尘土，励磁机静子漏进尘土等物，励磁机静子线圈温度高等不良现象，提出改进方案，实施后效果良好。

Choi to pay a deposit of 20,000 yuan with nature, in order to enter into a contract for the sale of real estate secured, it is both the commercial and residential housing can have a disagreement which led to failure to enter into a contract for the sale of commercial housing , and the subscription book, there is no clear agreement on this issue, it failed to enter into a contract for the sale of commercial housing is not attributable to the reasons for the parties, the two sides do not exist at fault, the deposit does not apply penalties, the plaintiff to pay the deposit should be returned.

经审理，法院认为崔某交一定的押金20000元，性质，以签订合同的销售不动产担保，这是双方的商业和住宅可以有分歧，而导致未能进入销售合同的商业住房，认购书，但没有明确就这一问题达成协议，但未能进入销售合同的商业住房不归于的原因，各方，双方不存在过错，存款不适用刑罚，原告支付定金应退还。

Then we prove that if the initial data enter into the unstable set, then the solution of the aforementioned Cauchy problem blows up in finite time, and if the initial data enter into the stable set, then the solution of the aforementioned Cauchy problem globally exists.

其次证明了如果初值进入不稳定集，该柯西问题的解在有限时间内爆破；如果初值进入稳定集，该柯西问题的整体解存在。

But when we examined the structure of cultivar of D. huoshanense, endomycorhiza was founded unexpectedly. And in the wild type of D. huoshanense, fungi was also founded in its stems and leaves. So the author thought that endomycorhiza is not only located in the roots of Dendiobium plants, but also exists in other organs of plants, including stems, leaves. As plant produces seeds, mycorhiza could enter into the cells of seeds. When mature seeds germinate in media, the endomycorhiza enter into the roots of cultivar.

石斛属植物与真菌共生，根为菌根，作者在研究霍山石斛组织培养型结构时发现，组织培养苗的根部也分布有真菌，而且在野生霍山石斛的茎、叶中发现有真菌，作者因而指出，真菌并不是完全分布在根部，而是遍布于整个植物体，推测植物形成种子时，真菌进入种子，所以在组织培养时，真菌随着种子的萌发，进入植物体根部。

The situation of abnormal development of male cells is as follows:microspore mother cell can't enter into meiosis because of intense vacuolation,shrink and disintegration of its cytoplasm;although vacuolated microspore mother cell can enter into meiosis,it can't form normal dyad and degenerate in the middle process;dyad and tetrad become vacuolated and can't develop normally;cytoplasm of microspore shrinks around the nucleus at the stage of central nucleus microspore,the shape of microspore is twisted into crescent or irregular shape,at last its cytoplasm and nucleus are disintegrated and crescent vacant microspore presents;nutritive substances can't be accumulated at the stage of vacuolated microspore,cytoplasm is disintegrated,and microspore turns into a big vacant pollen.

雄性细胞异常发育有几种情况：小孢子母细胞强烈液泡化，细胞质收缩解体，不能进入减数分裂；小孢子母细胞液泡化，虽能进入减数分裂，但不能形成正常二分体而中途退化；二分体、四分体细胞液泡化，不能进行正常发育；单核小孢子中央期，细胞质收缩包围核，小孢子形状扭曲呈月牙形或不规则形，最终细胞质和核解体而呈月牙形的空壳小孢子；单核液泡期的小孢子不能积聚营养物质，细胞质解体而成为大的空壳花粉粒。

The results showed that No.10 to No.30 leaves,charactered with longest growimg period,hight temperature accumulation,were main function leaves.From No.20 leave,sugar beet enter into beet root,sugar inercasing period.From No.55 leaf,it enter into sugar accumulation period.

叶片是甜菜的唯一光合器官，叶片的数量、寿命、生长与枯萎等都影响着甜菜块根的形成和糖份的积累，最终决定着甜菜块根的产量和含糖量，所以，对具有光合作用的功能叶片的研究，尤为重要。

Fault Analysis and Treatment: An estimated following reasons: 1 self-completion computer emerged in the interface when activated by pressing the reset button, will appear in the start menu option to start, and the default choice is the safe mode, if the Press key, the system will enter the safe mode, restart the computer only needs to enter to the normal mode; 2 The system file is damaged or subjected to virus infection, resulting in Windows98 operating system can not enter into normal mode, can only enter the Safe Mode.

故障分析与处理：估计有以下几种原因：1）电脑在自检完成出现启动界面的时候按下了复位键，在启动时会出现启动菜单选项，并且默认选择的是安全模式，如果此时按键，系统便会进入安全模式，只需要重新启动电脑即可进入到正常模式；2）系统文件被破坏或遭受病毒感染，造成Windows98操作系统不能进入到正常模式，只能进入安全模式。

The tracer migration that the tracer concentration continuously injecting into semi-infinite sand column(initialization velocity is zero) and the pollutant continuously enter into aquifer through a discharging well that completely enter into the dive aquifer are two representative groundwater pollution problems ,Then this paper respectively sets above two decided solution problems and the union simulation problem of groundwater and solute as examples, from the question description, the mathematical model selection and determination, the parameters selecting to carry on the value computation, the read-write of attribute data , visualizes by the IDL programs, carries on the numerical simulation and the visualization post-processing to the above groundwater pollution problems, and according to the numerical solution and the solute migration curves, briefly analyzes and predicts the temporal and spatial distribution features and distribution range of contaminant concentration.

然后分别以半无限长沙柱中连续注入示踪剂浓度的运移、污染物通过一完全进入潜水层的排放井连续进入含水层这两个典型地下水污染定解问题及地下水流和水质联合模拟问题为例，从问题描述、数学模型选取确定、参数选取到运用IDL编程进行数值计算、属性数据读写、可视化，对上述地下水污染问题进行数值模拟和可视化的后处理，并根据数值模拟的数值结果和溶质运移曲线，对污染物浓度的分布范围及随时空变化趋势作了简要分析预测。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。