维数

Then the model is used to analyze the filter characteristics in the frequency wavenumber domain and the spatial-temporal domain.

分析了300km高度3维传输函数在频率波数域的特性，并以近地面单位脉冲点源为激发源，得到了内重力波在3维空间中的时空分布。

The wavenumber transform in load moving direction was applied to reduce the three-dimensional dynamic problem to a two-dimensional plain problem,in which each node has three degrees of freedom.

通过沿荷载移动方向的波数变换将三维问题降维成每个节点有3个自由度的平面应变问题，极大地提高了计算效率。

Later wags would expand the terminology to include byte (usually an 8-digit binary number) and even nybble (half a byte, or 4 binary digits).

后来的维纳把这一术语引伸到包含字节（通常是一个8位二进制数），甚至半字节（半个字节，即4位二进制数）的意思。

Basic characteristics of cosine transform spectrum were analyzed, where contour lines of 2D cosine transform of point mass present the shape of a quarter of concentric circles and the number of counter become small along with the increasing of wave numbers. The spectrum of vertical rectangularcylinder put up periodic zero counters which mark off quadrate areas, the values of counter in each areas alternately change between the plus and the minus, and with the increasing of wave number, the values of counter present attenuation character alike e exponent.

分析了点质量和直立矩形柱体重力异常余弦变换谱的基本特征：点质量二维余弦变换谱等值线呈1/4同心圆形状，等值线随着波数的增大而变稀；直立矩形柱体谱出现了周期性变化的零等值线，该等值线将非零等值线划分为a×b个矩形区域，而且等值线值在各矩形型区域中正负交替变化，随着波数的增大，不同的矩型域中等值线值呈e指数衰减特征。

Parts taper machining error analysis and compensation for wire cut machine tools;2. Process points analysis for die and mould in wire cut machining;3. Using MasterCAM and UG as the tools, the second method is carried through 3D modeling, 4 Axis NC programming and NC 2nd wire cut of worm wheel involute gear.

针对常规数控加工方法加工精密小模数蜗轮模具型腔，加工精确度低，齿形变形大，传动准确度低的问题，探讨了用Mastercam、UG软件进行蜗轮三维造型、四轴数控编程、数控线切割加工蜗轮模具型腔的工艺方法，给出了解决精密小模数齿轮模具加工新工艺，在工程上具有推广价值。

In the parameterized design of the hot wind furnace, the number of rows and columns of pipe bundle were always varied with design parameters, it was difficult to generate 3D parametric model of hot wind furnace.

在间接加热式热风炉的参数化设计中，蛇型管束的行数和列数随着设计参数的变化而变化，使得间接加热式热风炉三维参数化建模比较困难。

Ltd. have designed hundreds of vacuum furnace, test platform, vacuum equipments and other vacuum supported products for enterprises, companies,universities and so on .

公司现有高级工程师、工程师二十余名，全部采用计算机二维、三维软件进行辅助分析和设计，为企业、公司、大专院校等各行业设计制造数百台真空炉、试验平台、真空设备及其他真空配套产品。

The five indexs contained stature,height of sitting,weight,circumference of chest and circumference of head. Then it derived the indexs of stature /circumference of chest,the body mass index,Verveak index. C...

智力落后学生各项体格发育指标的均值总的趋势是随年龄的增长而增长，相对其他几项体格发育指标，头围的均数增长不平稳；胸围指标受性别的影响较小；大多数智力落后学生身体活动以及体育锻炼的状况较好；智力落后学生的营养状况还有待于进一步改善；维尔维克指数反映出智力落后学生的身体充实度和匀称度较好。

Quaternions extend the concept of rotation in three dimensions to rotation in four dimensions.

四元数将三维中旋转的概念扩展到四维中的旋转。

Secondly, two physical models were constructed, which could model rough surface and describe the features of the earth surface, such as chine, neck, valley and hill, etc. According to difference method, the ""true"" volume of the physical models were measured, which was 13260cm3 and regarded as the analysis foundation of the precision of the volume that was calculate by DEM. The discrete dada of the models on a regular spacing of 1cm were collected by 3SPACE FASTRAK and the DEM was obtained by interpolating the discrete dada through GIS software. Based on the volume of the models calculated by DEM, different interpolating methods (IDW, Spline, Natural Neighbor, and Kriging) and variation of grid spacing of data were compared and their effects on precision of volume calculation were analyzed.

构建了可模仿凸凹不平地形表面的实体模型，该模型能够表征山脊、山尖、山涧、丘陵等地形特征；根据体积差减法测量实体模型的体积作为数据精度分析的体积&真值&，该值为13260cm~3，作为采用DEM进行体积计算的基准值；利用精度为0.08cm的三维数字化仪采集间距为1cm的离散数据点，对离散数据点用GIS软件进行内插处理生成DEM模型，通过DEM计算出模型的体积，探讨不同内插方法(IDW、Spline、Natural Neighbor和Kriging)和数据格网间距变化对体积计算精度的影响。

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。