失效的

Based on the reason analysis of failure primary fracturing, the fracturing fluid and proppant of refracturing were optimized, the half-length of fracture and construction parameters were also optimized for the optimum design of refracturing wells.

同时对初次压裂失效的原因进行分析后，对气井重复压裂的压裂液、支撑剂进行优选，对重复压裂气井的裂缝半长和施工参数进行优化，从而完善对气井重复压裂的优化设计。

In chapter 3, differing with gonging criterions which use "safety factor" or "reliability indicatrix", the accidents were regarded as a problem of risk. Then probability model was established in ouder to bring out probability of ship collision with bridges and probability of failure due to ship collision with bridges.

在第三章中，与以往的设计规范中结构设计方程所使用的各种"安全系数"、"可靠性指标"等理念不同，本文将船桥相撞事故作为一个风险问题，建立了基于可能性的概率模型，得出了船舶撞击桥梁的概率以及由于船舶撞击致使桥梁结构失效的概率。

This proposal has been tested in the present study, in a second-order motion configuration, which was assumed to be irresolvable for the linear filter model. A luminance defined first-order motion and a motion-contrast defined first-order motion were used as control conditions. The results suggest that there was no significant difference between the amplitudes of the flash-lag effect in the second-order motion and in the first-order motion.

用视网膜外推机制不再有效的二阶运动刺激取代前人实验中的一阶运动刺激来研究闪现滞后现象，发现在视网膜推断机制失效的情况下，闪现滞后现象并没有减小，而是和一阶运动刺激条件下的量相当。

The Locally Linear Embedding algorithm based on Manifold learning is introduced firstly in this paper,because the

从分析基于流形学习理论的局部线性嵌入算法入手，针对传统的局部线性嵌入算法在源数据稀疏时会失效的缺点，提出了基于局部线性逼近思想的流形学习算法，并在S-曲线上采样测试取得良好降维效果。

Bearings fail for a number of reasons,but the most common are misapplication,contamination,improper lubricant,shipping or handling damage,and misalignment.

导致轴承失效的原因很多，但常见的是不正确的使用、污染、润滑剂使用不当、装卸或搬运时的损伤及安装误差等。

METHODS: The endodontic instrument was assumed as a metal conical bar. The normal stress of bending loads and the shear stress of torsional loads were calculated with the knowledge of mechanics. The relations between stress and such parameters as angle and radius of canal curvature, radius of instrument, polar moment of inertia, and metal elastic modulus were analyzed. The criteria for yielding and fracture of the instrument were discussed.

将根管器械刃部假设截面为圆的金属细锥杆，利用材料力学及断裂力学的原理与方法，分别计算根管器械在弯、扭载荷下的应力分布，分析应力与根管弯曲角度、根管弯曲半径、器械直径、器械横截面极惯性距、金属弹性模量等参数的确切关系；探讨器械屈服、断裂失效的准则。

METHODS: The endodontic instrument was assumed as a metal conical bar, the normal stress of bending loads and the shear stress of torsional loads were calculated with the knowledge of mechanics , the relations between stress and such parameters as angle and radius of canal curvature, radius of instrument, polar moment of inertia, metal elastic modulus were analyzed, the criteria for yielding and fracture of the instrument were discussed .

将根管器械刃部假设为截面为圆的金属细锥杆，利用材料力学及断裂力学的原理与方法，分别计算根管器械在弯、扭载荷下的应力分布，分析应力与根管弯曲角度、根管弯曲半径、器械直径、器械横截面极惯性距、金属弹性模量等参数的确切关系；探讨器械屈服、断裂失效的准则。

The main negative influence on the turbine life is the wear-out of lapse roll bearing which is a stochastic phenomenon with continuation of time under a special condition.

涡轮寿命的薄弱环节主要是滚动轴承的磨损，它是在特定环境条件下，随时间的延续而出现失效的随机现象。

This design is aims at the situation of Qianjiaying Mine existing protective device electivity leakage protection malfunction, development the high voltage intelligence switch has the protection function of leakage, overload, short circuit and monitor, thus reduces the breakdown power cut scope,and it is advantageous for the troubleshooting, reduces the power cut time, enhances the reliability of power supply.

本设计是针对钱家营矿现有的保护装置选择性漏电保护功能失效的情况，开发具有漏电、过载、短路和监视等保护功能的高压智能开关，用以减小故障停电范围，便于寻找故障，缩短停电时间，提高供电的可靠性。

The results showed that three reasons caused the failure of the fibre materials:1the fibre materials transforming into powder which was caused by the precipitation of mullite at high temperatures;2cracking and spalling of the refractory coating and refractory fibre felt;3low strength of the refractory fibre flet.

结果表明：硅酸铝质耐火纤维在高温下析出莫来石晶体导致纤维材料的粉化，耐火涂层和耐火纤维毡的开裂、剥离脱落，耐火纤维毡强度很低是导致纤维材料失效的3个主要机理。研究结果为新型耐火材料的研制或改进提供了重要依据。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐