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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。

Objective: The aim of this study was to observe the protective function of trehalose and phosphate at -80℃on human apheresis platelets, and to realize the long-term(3 months) protective function of this platelet storage solution.

目的观察-80℃条件下海藻糖联合磷酸盐对人单采血小板的保护作用，并了解海藻糖联合磷酸盐对血小板的长期保存(3个月)效果。

By appropriate selection of protective film polymers, the protective film can be compatible with the thick film paste.

通过恰当选择保护膜聚合物，该保护膜可与厚膜糊料相容。

Such as burning Glass Protective Film electric rice cookers, electric heated Glass Protective Film cookers, electric Niunaibei glass, glass, electric heated rice bags, glass, such as electric ovens

诸如玻璃电热烧锅、玻璃电热暖锅，玻璃电热牛奶杯、玻璃电热恒温电饭包、玻璃电热烤炉等

ZL03 2 354312.The innovations include: automatic self-closing and reliably sealed valve structure: the design of duplex valve clack with pilot valve to tackle the problem of reverse seal structured valve being difficult to be opened; an automatic drain control device to automatically drain the remaining water from the hydrant; protective plate provided between the hydrant body and the valve block to serve as a connection between the hydrant body and the valve block, which is the first one to be damaged when the ground hydrant is clashed, and prevent pulling-off of the whole above-ground part of the fire hydrant, so as to properly protect the main parts from any damage. The self-closing and reliably sealed valve now prevents drain of water, and only the damaged protective plate is needed to be replaced before immediate re-operation. Thus the repair work after clashing is very easy and simple.

其创新点为：具有能自动关闭并可靠密封的阀门结构：采用有先导阀复式结构阀瓣设计，解决反向密封结构阀门开启沉重费力的难题；设计自控排水装置，能自动排除栓体内余水；在栓体和阀体之间设计撞裂板，它既起到连接栓体和阀体的中介作用，又可在地上消火栓被撞击时率先破裂毁坏，并使露出地面的栓体不见整体脱落，有效保护各主体部件的完好无损，而此时阀门的自闭式结构可靠密封阀门阻止水源外泄，修复时只需更换损坏的撞裂板即可立即复位投入使用，使被撞后的修复工作变得十分轻松简便。

Copper and copper prevent discoloration protective agent, copper prevent oxidant, galvanization passivation blocker, silver protectant, LED silver protectant, prevent discoloration, gold, silver, and gold, protective agent, we hole of tin additive is not completely, and formaldehyde environmental protection coating resistant color effect very good, long time in the air will become yellow, oxidation.

铜保护剂、铜防变色剂、铜防氧化剂、镀锌钝化封闭剂、银保护剂、LED银保护剂、银防变色剂、金保护剂、金封孔剂，我们的各种锡添加剂完全是不含甲醛环保型，并且镀层抗变色效果很好，长时间在空气中不会变黄、氧化。

Now the Company has and Japan PET raw materials, liquid crystal protective film manufacturers set up good relations of cooperation, the introduction of Japan's raw materials and advanced production technology, in Guangzhou City, Tianhe Industrial Park, set up factories in cutting production in Japan PET protective film LCD Products.

现本公司已和日本PET液晶保护膜原材料生产厂家建立良好的合作关系，引进日本的原材料和先进的生产工艺，在广州市天河工业园设厂切割生产日本PET液晶保护膜产品。

Objective: To investigate the immune response induced by Cysticercus cellulosae protective antigen cC1 DNA vaccine in mice and the protective immunity induced by immunized newborn pigs.

目的：观察猪囊尾蚴保护性抗原cC1 DNA疫苗诱导的小鼠免疫应答，及对仔猪的免疫保护作用。

Besides, eyelash is the protective screen of the eye, have protective eye to avoid the function that gets the stimulation such as sunshine, sand and dust, fribble of avoid by all means.

再说，睫毛是眼睛的屏障，具有保护眼睛免受阳光、沙尘等刺激的功能，切忌轻举妄动。

AIM: To design and synthesize a new analogue of salidroside-tyrosol galactoside, observe its protective effects on focal cerebral and cardiac ischemia/reperfusion injuries and compare its protective effects with those of salidroside.

目的： 设计合成一种新的红景天苷(salidroside，SDS)类似物—酪醇半乳糖苷(tyrosol galactoside，TG)，进一步探讨其对心脑的保护作用并与红景天苷的保护作用进行比较。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。