变晶

In addition, the FeO bond length in this tetrahedral coordinated iron silicate structure decreases during the crystallization process.

进一步的研究发现，随着晶化的完全，这种铁-硅氧结构中铁-氧配键键长在慢慢变短。

Confirmation of high-pressure pelitic rocks in the north. The mineral assemblage of the early stage is gamet-Mg-rich chloritoid +phegite +quartz ±kyanite ±aragonite or gamet+Mg-rich chloritoid+phengite+paragonite+quartz, P-T conditions are 550±30℃ and 1.4～2.0GPa; the mineral assemblage of the late stage is muscovite +chlorite+quartz±albite, which undergone retrograde metamorphism of greenschist facies, P-T conditions are ＜550℃ and ＜0.6GPa.

确定北部高压变泥质岩石，早期矿物组合为石榴子石+富镁硬绿泥石+多硅白云母+石英±蓝晶石±文石或石榴子石+富镁硬绿泥石+多硅白云母+钠云母+石英，对应的温压条件为550±30℃和1.4～2.0GPa；晚期矿物组合为白云母+绿泥石+石英±钠长石，经受了绿片岩相的退变质作用，其温度小于550℃，压力低于0.6GPa。

The valence electron structure of medium chrome cast iron matrix is set up and the effect of Si on medium-temperature phase transformation is analyzed by using empirical electron theory of solids and molecules.

此文建立了290Cr8Si2中铬铸铁基体的价电子结构，运用固体与分子经验电子理论分析了中铬铸铁中Si对铸铁中温相变的影响，分析和实验结果表明，290Cr8Si2中铬铸铁基体含C、Cr、Si的-γFe晶胞中，C原子与Si原子的结合力强于C原子与Cr原子的结合力，中铬铸铁中较高的含Si量降低了铸铁基体的含Cr量，进而降低了中铬铸铁的淬透性。

Results indicate that when the strain rate is 1200 s-1, the twin number of samples in different orientation increases with plastic strain increasing; when the strain rate increases to 2800 s-1, the σ-ε curves have no obvious charges as the angle is 0o and 45o, compared with that at 1200 s-1; however the σ-ε curves vary from concave to convex when the angle is 90o, because thermal softening has occurred with increasing plastic strain, which results in the number of twin decreasing, and smaller strain hardening

结果表明：当加载应变率为1200 s-1时，不同取样方向的样品中孪晶数量均随塑性变形应变量的增大而增多；当加载应变率增大到为2800 s-1时，取样方向为0°和45°、流变曲线形状较应变率为1200 s-1时没有明显变化，而取样方向为90°时曲线形状由应变率为1200 s-1时的凹形变为凸形，曲线形状变化的原因是由于应变量增大，热软化效应使得孪

By means of the complex variable function method and introducing the conformal transformation,the anti-plane shear problem about two semi-infinite collinear cracks in one-dimensional hexagonal quasicrystals was investigated and the exact solution to mode Ⅲ SIFs was found out.

利用复变方法，通过引入适当的保角映射，研究了一维六方准晶狭长体中双半无限共线裂纹的反平面剪切问题，给出了Ⅲ型裂纹问题的应力强度因子的精确解。

It is suggested that the change of cooling curve is due to the facs that:(1) the ...

所有这些是由于超声波在金属中传播时，声能变热能和使欲凝固分子做平行于結晶面振动的結果。

The reason is that B group disturbed the crystallite structure and reduced crystallinte size.

原因是个基团B破坏了晶体结构使球晶的尺寸变小。

The effects of thepreparation conditions on the structures and performances of the sol samples were studied,followed by investigating the formation mechanism of the anatase TiO_2 particles. Thecharacterization of the as-obtained sol-gel samples shows that the TiO_2 and P-doped TiO_2sols have anatase crystal structures, and the latter has higher crystallizability than theformer.

通过对TiO_2溶胶进行微观结构表征，发现：TiO_2溶胶和掺磷TiO_2溶胶均呈锐钛矿晶型，颗粒呈梭形，分散性较好，后者的结晶度更高；两者在可见光区均有较大的光吸收，最大吸收波长为550nm，磷的加入使得TiO_2的禁带宽度变大。

The results show that upper bainite and grain boundary segregation of Si element result in embrittlement of the oil cylinder.

结果表明，上贝氏体和Si元素的晶界偏聚导致油缸变脆。

Based on the average lattice and average atom models, effects of interstitial impurities on the valence electron structures and phase transformation of Ti-Al alloys are analyzed, and the degree of descension of bond energy, melting point and liquidus temperatures as affected by interstitial impurities are calculated by the bond energy formula of the EET.

应用固体与分子经验电子理论的平均晶胞和平均原子模型分析计算了间隙杂质对Ti-Al合金价电子结构和相变的影响。同时根据该理论的键能公式计算了间隙杂质影响下的键能、熔点和液相线的变化。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。