有限维的

The main works include: In this thesis, we use Finite Difference Time Domain method to study the relationship between diffraction efficiency, angular dispersion and grating constant, to discuss how the grating figure influence the diffraction efficiency, and to research the frequency spectrum characteristic.

主要工作包括：本文分别在垂直入射和自准直入射（光垂直于光栅刻槽面入射）情况下，采用时域有限差分方法，利用商业数值计算软件OptiFDTD对二维闪耀光栅进行了矢量电磁场数值计算，研究了光栅的衍射效率和角色散随光栅常数的变化情况，研究了光栅形状对光栅衍射效率的影响，还讨论了各种光栅的频谱特性。

According to the limited space the end of all surface sampling points in 3D space within the Cartesian coordinates, then be converted into computer on the screen coordinates of the pixel, thus drawn with a real sense of three-dimensional images.

根据有限空间中底面上所有采样点在三维笛卡儿空间内的坐标，然后将其转换为计算机屏幕上的像素点的坐标，从而绘制出具有真实立体感的图像。

In particular, we compute Hochschild homology and cohomology groups of infinitedimensional path algebras and some of their quotient algebras, and we prove that for a general monomial algebra (not necessary finite-dimensional), all Hochschild cohomology groups of positive degrees vanish if and only if its Gabriel quiver is a finite tree.

特别地，我们计算了无限维路代数以及某些商代数的Hochschild同调群和上同调群，而且给出了一般单项代数的各正次Hochschild上同调群为零的充分必要条件，即它的Gabriel箭图是有限树。

The results are consistent with the test data and the dynamic analysis model is proved correct.

应用三维有限单元和导弹实体简化模型对一种战术导弹的结构振动特性进行分析，并运用ANSYS有限元分析程序，计算得到了"自由-固支"条件下，导弹竖立状态的固有模态，取得了与试验和数据基本一致的结果，证明了所建模型的正确性。

Based on the theory of large deformation and using the differential geometry.

基于有限变形原理，采用微分几何的方法推导了不考虑剪切、转动惯量和翘曲影响的曲梁的三维变形的应力应变关系。

A method for generating three-dimensional mixed element type unstructured grids and its application for viscous flow simulations by solving the Navier-Stokes equations are presented.

采用一种改进精度的格心有限体积法对三维 NS方程进行了求解，在加速收敛措施方面，提出了一种新的当地时间步长取定方法来减小质量较差的网格单元对流场计算稳定性和收敛速度的不利影响。

It is presence in China with the aim of developing the local market by offering the maximum in terms of design, safety and functionality and we are devoted to provide the best product and best service to our customers.

盖维斯贸易有限是GEWISS 集团在中国大陆的独资企业，使命是开发国内市场，为市场提供集设计、安全和功能配套的一体化电气系统产品，为客户提供最佳的产品和最完善的客户服务。

Orange sea of domestic work,"China's first mobile rich media advertising," stars Michael Wiki and wireless networks, integrated national network of top wireless technology and its advantages of a number of products, is committed to providing a full range of wireless, Internet marketing, etc. The new media professional services, including ICT enterprises, mobile DM, Cell SMS, MMS, mobile maps, video phones, mobile phones and WAP Website reported, WAP Union, the video ads when using the power of new media for all types of customers To open up a "limited competition will create enormous business opportunities," a new orange sea. Shanghai Telecommunications Co., Ltd.

橙海携手国内&中国第一手机富媒体广告商&星麦无线和维客网络，整合国内顶尖网络及无线技术旗下多款优势产品，致力于为企业提供全方位的无线、网络营销等多种新型媒体的专业性服务，包括企信通、手机DM、小区短信、彩信、手机地图、手机视频、手机报和WAP建站，WAP联盟、网络视频广告等到，借助新媒体力量为各类客户开辟&有限竞争创造无限商机&的崭新橙海。

CFD is also used to get the data of performance parameters of the nozzle at different nozzle pressure ratio, different nozzle area ratio and different geometric defected angle.

研究了Jamson提出了中心型有限体积法，并改进了其在边界上的处理，通过验证计算验证了本文发展的矢量喷管三维有粘流动计算程序的正确性。

Ziska had something more ambitious in mind, but his budget, which has been cut repeatedly by an administration seemingly intent on minimizing attention to global climate change (his lab has been reduced to 3 researchers who study climate change and agriculture, from 10 in 1999), wouldn't support the construction of special facilities.

由于齐思卡在马里兰州贝兹维尔的美国农业部研究院实验室设备条件很有限，最理想的条件是有间栽培室，或至少要有一间带有内部空气和温湿度控制、人工照明、有一人多高的铝制大盒子。

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。