立方

The energy curve of the body-centered cubic structure of theH92 +cluster is calculated by means of variational method.

用变分法计算了H29+团簇的体心立方结构与能量。

The 1S and 2S energy bands of body-centered cubic lattice were calculated.

具体计算了体心立方晶格的1S能带和2S能带。

The results indicate that Al and Cu form inter-metallic compound Al2Cu with body-centered tetragonal structure at first, then Al2Cu alloys with Fe, and Al of cubic crystal structure is formed.

结果表明：样品中Al和Cu原子首先组成体心四方结构的Al2Cu金属间化合物，然后与Fe原子合金化，形成Cu和简立方晶体结构AlFe的固溶体。

The micro spherical and body-centered cubic mesoporous carbons with irregular shapes can also be obtained by only employing F127 as a template.

而在磁力搅拌的条件下，可得到具有体心立方(Im3m)结构的不规则形状的粉末材料。

The prepared SBA-16 thin films with narrow pore size distribution have a body-centered cubic structure Im(average3m space group.

所制备的SBA-16薄膜孔径均匀，具有体心立方结构（属于Im3m空间群）。

In this paper, modified analytical embedded-atom method, combined with heavy-bit lattice model, using MATLAB programming from the atomic-scale calculations and analysis of body-centered cubic metals Fe (001) face to reverse the grain boundary of energy and structure of crystals between the translation and expansion of energy and structure of the system, and with the relevant control experiments were observed.

对材料性能预测、材料改性和新材料设计以及传统材料及其应用有着重要的指导意义。本文采用改进分析型嵌入原子法，结合重位点阵模型，借助MATLAB编程从原子尺度计算和分析了体心立方金属Fe(001)面扭转晶界的能量和结构，探讨了晶体间平移和膨胀对体系能量和结构的影响，并与相关实验观察进行了对照。

And comparison of their most stable surfaces with the body-centered cubic Fe shows that these carbide surfaces have lower surface energies than the most stable (110) surface of body-centered cubic Fe, indicating that the surface thermodynamics favor carburization at Fe surfaces.

另外，与面心立方铁最稳定表面(110)相比，Fe2C、Fe3C及Fe4C晶体最稳定表面具有较低的表面能，表明铁表面碳化在热力学上是有利的。

The results show that the microscopical pore structure of the three dimensional orthogonal woven carbon fabric structure perform is composed of body-centered cubes which arranged periodically at spaces. The net structure and shape of the pores of perform are determined by the size and proration of the fasciculus diameter, which are key factors influencing the gaseous permeability and final density of composites. Once the proration of the fasciculus diameters of different directions is determined, the trend of diversification of the permeability followed by pore rate during CVI process and the density of composites are stated, and the permeability increases with the increase of the fasciculus diameter.

研究结果表明：三维正交结构炭纤维预制体的宏观孔隙结构在空间上可以看成是由呈周期性排列的体心立方&晶胞&构成； X ， Y 和 Z 3个方向纤维束直径大小及比例关系决定三维正交结构炭纤维预制体宏观孔隙网络的结构和形状，也是决定反应气体在孔隙中的比渗透率和复合材料最终致密度的重要因素；当 X ， Y 和 Z 3个方向纤维束直径的比例关系一定时，不同预制体在CVI增密过程中比渗透率随孔隙率变化的趋势相同；复合材料的最终致密度一定；比渗透率随纤维束直径增大而略有增大。

It was shown by further research that the formed tungsten oxide had an obvious layer-like structure, where from outer to inner layer the valence of tungsten increased and the reduction degree decreased. The carbonization of W depended on the replacement of W atom at the center of the body-centered cubic by C atom and the minor adjustment of C atom position and the lattice parameters.

深入研究表明，氧化钨碳还原颗粒具有明显的层状结构，自外到内钨的化合价递增，还原程度降低；钨的碳化是碳原子替换体心立方钨晶胞的中心钨原子，然后碳原子转换到钨原子点阵间隙再经晶胞常数微调而形成。

RO_2·8% Y_2 O_3 was deposited by rf magnetron sputtering on NiCrAlY bond coat,thermal cyclingand fused salt effect experiments were made under the condition of 1100℃ room temperature 1100℃ cold water , and 900℃ room temperature,and were investigated by XRD and SEM,The results showthat ZrO_2·8% Y_2 O_3 deposited appears mainly as cubic and a little monoclinic phase and tetragonalphase.

将ZrO_2·8％Y_2O_3用射频磁控溅射技术沉积在NiCrAlY底涂层上，进行ll00℃→室温，1100℃→冷水和900℃→室温等热周期和熔盐作用的试验。随后进行X－射线衍射分析和扫描电镜（8EM）观察。结果表明，沉积态的氧化锆层主要为立方相和少量单斜相及四方相。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。