正六面体

是二维的（平面的），而正六面体则是三维的（立体的）。

A square is two-dimensional and a cube is three-dimensional .

以正六面体为例说明了这些参数的具体计算。

A cube is used to explain the calculation of these geometric factors .

对Ni/SiO2系列催化剂上生成的碳纤维进行SEM和TEM表征，结果显示，Ni/SiO2催化剂中Cu的加入使反应过程中Ni金属颗粒变形为近似于正六面体结构，晶粒长大到80～100nm。

SEM and TEM were used to characterize the morphology of carbon filament produced on Ni / SiO2 serial catalyst . It was shown that Ni particles transform from pear shape to quasi hexahedron shape after Cu addition .

用矩形、四面体和正六面体单元计算非稳定温度场

The computing of the unsteady temperature fields by rectangular , tetrahedron and right parallelepiped elements

本文用剖割的方法计算了正六面体电路任意两端子间的等效电阻。

This paper , using cutting method , calculated the equivalent resistance of any two points of the circuit in the normal hexahedron .

三维有限元法中五面体等参元及其数值积分然后就本文采用的空间八节点正六面体等参元讨论了其具体的有限元列式。

ISOPARAMETRIC PENTAHEDRON ELEMENTS AND THEIR NUMERICAL INTEGRATIONS IN 3-DIMENSION FINITE ELEMENT METHOD Taking the six-node hexahedron element for example , the detailed FEM formulations are developed .

本文根据中心构型的概念，找出了一类特殊的中心构型&正六面体与正八面体构成的复合式中心构型，给出了正六面体与正八面体构成复合式中心构型的充要条件。

In this thesis , we find a kind of special compound central configuration which is composed of regular hexahedron and regular octahedron , and also we study the necessary and sufficient conditions for regular hexahedron and regular octahedron to form a central configuration .

在蒲丰投针问题的基础上，把投掷物由一维的针推广到二维的凸曲线，三维的正四面体、正六面体；

This paper tries to generalize the throwing objects from the one dimension pin to the convex curve in two dimension , and even the three dimensional regular tetrahedron and regular hexahedron .