六面体的

As hexahedral mesh has more advantages than surface mesh and tetrahedral mesh, a research hotpot is concentrated on hexahedral mesh generation algorithm.

由于六面体网格在很多方面具有其它面网格和四面体网格无法比拟的优越性，所以研究热点都集中在六面体网格算法的研究上。

The unit type was the mixture between tetrahedron and hexahedron.

产生的单元类型为四面体与六面体的混合。

The experiments are conducted with small parallelepiped samples vertically placed in a wind tunnel.

试验中，我们把呈平行六面体的样品竖向放置在风道中。

Two light grey parallelepiped blocks sit quietly one on top of the other on the mountainside of Izu-san , as if they are clock hands and the time reads ten to two exactly as they are set in the plot.

浅灰色的平行六面体的两个区块静静地坐在关于伊豆的山腰山其他顶级之一，因为如果他们的手和24小时的时间读1时50分完全一样，他们是在情节设置。

SEM results show that the morphology of the anhydrous magnesium carbonate is a well-crystallized multiple layer parallelepiped .

SEM 结果显示无水碳酸镁呈结晶良好的多层平行六面体形态，该平行六面体的底面近似于菱形，边长约为20μm，六面体的侧棱长约20～25μm。

Supervised and unsupervised image classification were applied to the study area TM image and t o the paddy field TM image. And the early rice areas were calculated by each met hod. Using the proposed methodology improved the quantitative accuracy of ear ly rice area estimated up to 93.98%, whereas it was 82.83%when image classific ation was used only. The extracted information from the c lassification is belonging to the early rice and not to any other vegetation. Si nce the GIS database is available, the method is easily applicable to any new RS images.

不同方法比较结果表明：非监督分类法不能用于提取丘陵山区的水稻种植面积；只用TM资料估算龙游县早稻面积，与统计数据相比，平行六面体分类法、最大似然分类法精度分别达到82.83%和59.95%；而用GIS 与TM资料集成技术对水田分布图进行分类估算早稻面积，平行六面体分类法、最大似然分类法的估算精度分别达到93.98%和60.65%，所以利用平行六面体分类法对南方丘陵山地早稻种植面积估算是可行的。

Well-aligned nanoscrews are single crystals grown along the c-axis, with 18 sides on their heads but six concaves on their stems, while the whole is six-fold symmetry.

定向生长的纳米螺杆呈单晶态、c轴择优取向生长，且具有头部十八面体茎部六面体的结构。

The foundation of arch dam usually is layer rock base, and the depths of the layer are small, it is common that several layer rock base contact with one layer element grid. According to the geometry relation and the property of shape function, a new element kind that includes 24 nodes has been proposed to dissect the dam and foundation effectively, whose shape function are independent. In fact the element can be looked as a hexahedron divided into five small hexahedrons. It can be simulate all kind of the condition of the base and the dam.

拱坝的地基一般是层状岩石地基，有的层厚度很小，这样就有多个岩层和坝体某层单元接触，本文根据岩基与坝体接触的几何关系，利用形函数的性质，提出24节点六面体层单元，这种单元实际上是将一个厚的六面体单元分成5个更薄的六面体单元而形成的，其形函数采用可以拆分的形式表达，因此可以方便地解决坝体单元的一、二、三、四个面与错动带接触的情况，可以模拟一、二、三、四个棱边与错动带接触的情况，还可以退化为12节点的四边形面单元，以及五面体层单元。

Different from Ni70Mn25Co5（suitable for growing （100）crystal plate）, Fe is suitable for growing (111) crystal plate. It may be related to that (100)growing area of Fe is very narrow. In diamond research with medium of Fe, most crystals are octahedron or six-eight body. It is very hard to synthesize hexahedron diamond.

与Ni70Mn25Co5触媒生长特性（适合于（100）晶面生长）不同，Fe作触媒适合于（111）晶面生长，这可能跟Fe触媒的（100）生长区非常窄有关，因为在Fe触媒粉末金刚石研究中，晶体基本为八面体或六八面体，很难合成六面体金刚石。

This work presents a unifying framework based on the parallelism constraint, and the previous methods based on the parallelograms or the parallelepipeds can be integrated into this framework.

该工作提供了一个基于平行性约束的框架，以往的基于平行四边形、平行六面体的方法都可以纳入到这个框架中。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。