二维的

Initial boundary value problem of two dimensional unsteady diffusion equations is solved in this paper. By using time-dependent fundamental solution of two dimensional diffusion equations and the extension of double layer potential, we establish virtual boundary integral expression of diffusion equations. Then virtual boundary element method is used to implement the numerical computation.

本文在求解二维非定常扩散方程的初边值问题时，利用二维扩散方程与时间有关的基本解，基于双层位势的延拓，建立二维扩散方程的虚边界积分表达式，然后利用虚边界元法进行数值计算。

Secondly, the gun barrel temperature field is solved by two-dimensional and one-dimensional heat conduction model with finite element method and finite difference scheme respectively.

其次通过对身管二维轴对称传热模型和一维径向传热模型的数值计算，研究了身管固壁的传热问题。二维轴对称传热计算采用了有限单元法，一维径向传热计算采用了有限差分法。

Some questions in digital elevation model were discussed detailedly, such as the obtaining of data points, the fast searching of reference points, the interpolation algorithm of quadric surface, the abnormal data eliminating, and so on. And this paper has realized the 3D vectorization of 2D terrain maps, the 3D display and edit of DEM data with the help of secondary development of CAD.

文中详细讨论了数字高程模型中数据点获得、参考点的快速搜索、二次曲面的插值算法、粗差剔除等内容，并运用AutoCAD二次开发技术，实现了二维地形图的三维矢量化以及DEM数据的三维显示和编辑修改。

Three dimensional entity data can be generated by running three dimensional turnover molding of planar figure (which is based on solid of revolution).

通过分析文件格式，在 Visual C++6 。0编程环境下获取文件中的二、三维图形信息，对其中基于回转体的二维图形进行三维旋转造型，生成三维实体数据。

Rendering 2D GIS layer in 3D environment is the key problem of realizing compact type of the two and three dimensional integration GIS system.

在三维系统中实时渲染二维图层是实现紧密型二三维结合GIS的关键。

Results:Fractures in body,angle and ascending branch of mandible could be showed fine by all these imaging methods. 3D-CT was better than 2D-CT and conventional X-ray plain film in diagnosis of fractures in condyle and coronoid process. Conventional X-ray plain film was poor in diagnosis of the maxillary fractures.2D-CT and 3D-CT were similar in diagnosis of the maxillary fractures.3D-CT showed the jaws fractures directly and stereoscopicly.

结果：对于下颌骨体部、角部和升支骨折，三种影像学都能很好的显示，对于髁状突和喙突骨折，三维CT检查优于常规X线和二维CT；常规X线显示上颌骨骨折较差，而二维CT和三维CT显示的准确性比较接近。

This is the first example of two-dimensional lanthanide MOFs with one dimensional water chains.2、Coordination polymer[Nd_2_3(H_2O)_2]·bpy·4H_2O(2)(bpdc=2, 2′-bipyridine-3,3′-dicarboxylate,bpy=4,4′-bipyridine)had been synthesized under hydrothermal conditions and its structures were determined by X-ray diffraction,and confirmed by IR and TG analysis.

该结构是在二维骨架的镧系配位聚合物中首次观察到的一维的水链结构。2、以Nd_2O_3，2，2′-联吡啶-3，3′-二羧酸和4，4′-联吡啶为原料，采用水热法合成了一个具有二维骨架结构的配位聚合物[Nd_2_3(H_2O)_2]bpy·4H_2O，通过IR、x射线单晶衍射分析和热重等手段对其结构进行了表征。

In this paper, a novel two-dimensional kernel maximum scatter difference discriminant analysis (2D-KMSDA) is developed for the extraction of nolinear feature by using the well-known "kernel trick". It extracts much more effective nolinear feature and made the true recognition rate raise saliently. What's more, it also offers a unified framework for two-dimensional nolinear discriminant analysis.

本文通过引入著名的&核技巧&，将二维最大散度差线性鉴别分析扩展到非线性空间，提出了一种新的二维核最大散度差鉴别分析方法，该方法不仅抽取了图像中更加有效的非线性鉴别特征，使正确识别率显著提高，而且为二维非线性鉴别分析提供了一个统一的构架。

Replacing DETA with PIP, a new three dimensional compound 3 issynthesized and the 3D anionic framework of compound 3 is constructed from twodistinct motifs, a one-dimensional tancoite chain and a single 4-ring (S4R) unit,which contains four intersecting channels running throughout the structure as 8,12-member ring channels along to the a axis and 12-member ring channels along theb and c axis, respectively.

其中，以乙二胺为模板剂的亚磷酸铟微孔化合物具有无限的共边4员环一维链状结构；以哌嗪和1，6-己二胺为模板剂合成出的亚磷酸铟化合物分别具有二维交叉8员环孔道和16员环孔道的三维开放骨架结构。

In the 2D non-contacted body measurement, the size of body girths can only be acquired indirectly by data transform from 2D to 3D.

二维非接触人体测量系统中，围度尺寸需要通过二维至三维的数据转换间接获得。

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。