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Crysalline shape and behavior were investigated by polarizing microscope and wide angle X-ray diffraction spectrum.The results show that the value of impact strength is maximum while tensile strength,flexural strength,modulus and vicat softening temperature are least when the content of β form nucleator is 0.05 phr.

结果表明，当β成核剂的含量在0.05份时，冲击强度达到最大值，而拉伸强度、弯曲强度、模量、维卡软化温度等达到最小值；当β成核剂含量为0.05份以下时，随着β成核剂含量增加，PP中β晶结晶度大幅度上升，同时α晶结晶度大幅度下降；增加β成核剂用量至大于0.10份时，β晶结晶度略为下降，而α晶结晶度上升，但总结晶度随着β成核剂含量增加呈现上升趋势。

This paper delivered the relationships of uniaxial tensile and compressive stress with strain and bending properties,and felt－bending strength of cement mortar with polyvinyl acetate.

研究掺聚醋酸乙烯水泥砂浆的轴拉和轴压应力—应变关系、抗弯性能以及长期粘结抗弯强度。

The ration of Pd to P is defined as the stressing uniformity coefficient of one steel line. Through com prehensive analysis of test data, the variation of P(reading of preaure metre on tensile jack)with the uniformity coefficient can be deseribed by thefunctional r...

经对试验数据进行整理、分类组合及综合分析，找出了锚索的张拉力P（张拉千斤顶上压力表读值）与均匀性系数的＝A·PB函数关系，再进行回归分析，从显著相关的回归曲线上，可直观地得出单根钢绞线在锚索张拉锚固时各种工况下不同位置上受力的均匀性。

Comparison of the results of experimental study and theoretical analyses further shows that the nesessary condition for the hydraulic fracturing of a soil is that the minor principal stress on the inner surface reaches the tensile strength of the soil under the action of water pressure.

试验研究与理论分析结果的比较进一步阐明促使土体发生水力劈裂的必要条件为在水压作用下内壁表面的最小有效主应力达到土的抗拉强度，从而指出过去采用的那些水力劈裂判断准则，如水压超过最小总主应力等等，都是不正确的。

The results show that, with the expansion cone angle remaining unchanged, the sizing length of expansion cone does not have much effect on the residual stress of casing after expansion, but it has much effect on the expansion force required by tube expansion. The expansion cone angle has no effect on the maximum residual stress of casing, but it has remarkable effect on expansion force. When the radial component force of expansion force is greater than the material's tensile strength, the damage to the material will arise.

研究结果表明，在膨胀锥锥角保持不变的情况下，膨胀锥定径长对膨胀后套管的残余应力没有太大影响，但对套管膨胀所需要的膨胀力有较大影响；膨胀锥锥角对套管最大残余应力没有影响，但对膨胀力的影响十分明显，当膨胀力的径向分力大于材料的抗拉强度时，材料将发生破坏。

Dongguan Jian Dong Rubber Products Co., Ltd., founded in October 2000, specializing in the production of various rubber products and all kinds of red gum type of foam material, rubber material, EMI series fully meet customer heat, oil, pressure, acid and alkali resisting, wear-proof, tensile, tear, fire-retardant, shock, cold, electric insulation, radiation resistance, low permeability requirements and other objects.

东莞市建东橡胶制品有限公司，创建于2000年10月，专业生产各种橡胶制品及各类背胶冲型之发泡材料，橡胶材料、EMI系列等，充分满足客户对耐热、耐油、耐压、耐酸碱、耐磨、耐候、抗拉、抗撕裂、阻燃、减震、耐寒、电绝缘、耐辐射、低透气等物性要求。

The results show that the grain size is refined by the addition of Nd or Dy, especially combined addition is better than single addition. With the addition of 0.2 % Nd and 0.6% Dy, the grain size is reduced from 150 μm to 60 μm. Combined addition with two rare earths elements makes the tensile strength, yield strength and elongation of ZK10 alloy increase to 191.0 MPa, 69.0 MPa, and 16.6%, increasing by 89%, 43%, 232% respectively, compared with ZK10 alloy without RE element.

结果表明：ZK10镁合金中分别加入Nd和Dy均能细化晶粒，且Nd和Dy同时加入的效果优于单一加入的效果，当同时加入质量分数为0.2% Nd和0.6% Dy时，合金的平均晶粒尺寸由原来的150 μm细化至60 μm，使ZK10合金的抗拉强度和屈服强度分别提高至191.0 MPa和69.0 MPa，伸长率达到16.6%，与未加入稀土的ZK10合金相比分别提高89%，43%和232%。

Shows the influence of billet reheat time and temperature on tensile yield strength.

图2示出了坯料再加热时间和温度对拉伸屈服强度的影响。

The appropriate assembly temperature is related to mechanics properties of material and operating temperature, so reiterative computations are necessary to find an appropriate assembly temperature by the method that makes the maximal tensile stress smallest under conditions that the maximal compressive stress is less than the compressive yield point of material.

安装温度的选择与材料的力学性能及零件的工作温度紧密相关，因此选择合适的安装温度需要反复计算，其方法是在保证循环中的最大压缩应力小于材料压缩屈服点的条件下，使最大拉应力最小。

Based on the experimental results, effects of relative density, strain rate and temperature on the tensile mechanical properties of nickel foam are analyzed.

在实验研究的基础上，分析了相对密度、应变率和温度对泡沫镍拉伸力学性能的影响。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。