查询词典 cracking

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

The effects of reaction temperature and space velocity on the cracking gas and liquid product yields and distribution of light FCC gasoline were investigated.

考察了反应温度和空速对催化裂化轻汽油裂化反应气液相收率和产品分布的影响。

Aromatic solvent naphtha was obtained by two-stage synthesis from C9 fractions from ethylene cracking with boiling range of 100~200℃ in the presence of Lewis acid as catalyst.

以沸程在100~200℃乙烯副产C9馏分为原料，进行了以Lewis酸为催化剂的两段聚合法制备芳烃溶剂油工艺的研究。

The experimental results show as follows: Slag could inhibit the cracking of concrete within the range of certain proportion. With the increase of slag proportion the self-shrinking of concrete increases, but the drying shrinkage of concrete decreases.

结果表明矿渣掺量在一定范围内时可抑制混凝土的开裂，混凝土的自收缩随矿渣掺量的增大而增大，干缩随矿渣掺量的增大而减小。

The experimental results show as follows: Slag could inhibit the cracking of concrete within the range of certain proportion. With the increase of slag proportion the selfshrinking of concrete increases, but the drying shrinkage of concrete decreases.

结果表明矿渣掺量在一定范围内时可抑制混凝土的开裂，混凝土的自收缩随矿渣掺量的增大而增大，干缩随矿渣掺量的增大而减小。

The results show that with the increase of strain rate, the grain sizes of thermal simulation AZ31B alloys with different deformation all decrease; however, when other conditions are the same, the higher deformation will lead to the formation of the smaller grain size, and as the cooling intensity decreases, typical cast structure of AZ31B will appear. With the decrease of roll casting temperature, the dendritic size of roll casting AZ31B alloy sheet prepared by the same strain rate is also reduced, but with the increase of strain rate, the dendritic size of the alloy sheet prepared by the same initial roll casting temperature is decreased, and the tendency of dendritic streamline is strengthened. During the roll casting process of AZ31B alloy, rolling force should not be large, otherwise it will cause heat cracking.

研究结果表明：在不同应变量下，热模拟样品的晶粒粒度均随应变速率的增加而减小，而当其他条件相同时，变形量越大晶粒粒度越小，冷却强度降低，合金呈典型铸态组织；利用铸轧技术生产的AZ31B合金，当应变速率一定时，随着初始铸轧温度的降低，铸轧态板材的树枝晶粒度逐渐减小；而在初始铸轧温度一定时，随着应变速率的增大，铸轧态合金板材的树枝晶粒度也逐渐减小；而随着应变速率的提高，树枝晶沿轧向呈流线状排列的趋势增强；在AZ31B合金铸轧过程中，轧制力不能太大，否则容易引起热裂。

Commonly used as stem materials in pressure-rated valves, silicon bronze has greater resistance to stress corrosion cracking than common brass es.

通常在压力等级阀门中作为阀杆材料使用。在防止金属超压力引起的腐蚀造成的断裂方面，硅青铜比常见的黄铜具有更好的性能。

Graphics card or whether the time slot is too long and too much dust, as well as causing bad; display card chip if there were burnt and traces of cracking; lead to a black screen due to display card, the computer will power-on self test Fourth, there is a short-long "嘀嘀" voice prompt.

显示卡或插槽是否因使用时间太长而积尘太多，以至造成接触不良；显示卡上的芯片是否有烧焦、开裂的痕迹；因显示卡导致黑屏时，计算机开机自检时会有一短四长的&嘀嘀&声提示。

Some factors which affect shell cracking, such as temperature, humidity, air flow velocity in shell building room were discussed in this paper and control measures were showed.

讨论了型壳间温湿度、力对型壳开裂的影响，并提出了监控的具体措施。

I think the punch would have to be slight Vee shape shearing the punch to the middle of the 2 slot, may have to be warmed also to prevent cracking.

我确实有一些花盆，花盆上有一些槽，为2.25英寸正方形状，和圆形的直径为7.5英寸。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。