晶体学

Using this method, the crystallography calculation about the matrensite transformation in the Fe-31Ni alloy has been finished.

并对Fe-31Ni合金的马氏体相变晶体学进行了计算，计算结果与传统理论计算的结果完全一致。

The propagation direction of thermal fatigue crack has some crystal orientation and is along 〈110〉 direction in { 111 } plane.

合金热疲劳裂纹扩展具有一定的晶体学取向，沿{111}面〈110〉方向即与枝晶生长方向呈45 角扩展。

In fact, the double-helical structure of DNA was deduced from crystallographic data.

DNA 分子的双螺旋结构就是通过晶体学实验数据发现的。

We thank Ton Spek, George Ferguson and the IUCr Editorial Staff for all their input and assistance.

感谢汤-斯派克、乔治-弗格森和国际晶体学联合会的所有员工，他们为这项工作提供了很大的帮助。

The hexagonal structure as well as the icosahedral chain in it has been determined by the electron crystallographic analysis.

用电子晶体学方法测定υ-AlCrFe的六角结构及其中的二十面体链。

The formation of martensite is accomplished by the immigration of well-defined glissile interface (121)fcc type and its misfit dislocations can produce the lattice invariant deformation on the basis of phenomenal theory of martensitic crystallography, however, LID is retarded slightly after the migration of interphase (121)fcc, i.e.a thin plate-like zone exists without LID in martensite near the well-defined interface. When the temperature reduces to the Ms point, the lattice parameter of austenite matrix is √3/2 times that of the martensite without LID. This critical condition for spontaneous transformation agrees with that the stack fault energy in matrix is less than zero according to Olson and Cohen's nucleation model.

通过模型分析表明：fcc/bcc马氏体形核与长大过程是通过(121)fcc型择优界面推移进行的，界面上的错配位错可以完成马氏体晶体学唯象理论要求的点阵不变变形，但LID要稍滞后于界面迁移，即在马氏体形核与长大过程中推移界面新相一侧存在一未发生LID的新相薄区；当相变温度达到马氏体相变点Ms时，母相奥氏体与这一薄区的晶格常数比为√3/2，这一几何条件和Olson-Cohen形核模型中要求扩展位错层错区界面能γ≤0是等价的。

The B M theory of the phenomenological theory of martensite transformation is calculated.

利用MATLAB5 3对马氏体相变晶体学表象理论中的B M理论做了计算。

Analyses of quenched nm products revealed that the nepheline was completely transformed into NaAlSiO4 with the calcium-ferrite-type structure at 23 GPa and 1500℃ In combination with previous results, the calcium-ferrite-type NaAlSiO4 can exit under the conditions of deep lower mantle and it may be the important host phase for sodium and aluminium in the deep lower mantle. With the change of temperature and pressure, the crystal parameters will change, though the ranges are limited.

结合前人的研究成果可以认为：型NaAlSiO4在地慢深部可以稳定地存在，并对Na、Al在深部的赋存具有重要意义；随着温度压力条件的变化，CaFe2O4型NaAlSiO4的晶体学参数（晶格常数、晶胞体积和计算密度）发生变化，但变化的幅度不大。

The analysis of experimental data shows that such inhomogeneities depend on deformation temperature and strain sensitively.

对不同温度单向压缩下AZ31镁合金不均匀形变组织的形貌和晶体学特征进行了研究。

In addition, we make a preliminary study on the crystal structure of swine vesicular disease virus.

此外，本文还进行了猪水疱病毒初步X射线晶体学的研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。