查询词典 vector-potential

On the basis of the probe and research into space analytic geometry and seeing from the students ' thinking characteristics , this paper has got a proof about three vector double vector product theorem .

本文通过对空间解析几何的研究和探讨，从学生的思维特点出发，给出一个有利于学生认知结构形成的三矢量的双重矢性积定理的证明

analytical geometry ; the thinking of vector ; vector tool ; the structure of cognize

教材从空间向量与坐标入手，主要以向量为工具，研究空间中的一些几何图形及性质，不论从知识上还是从思维上，都是对中学内容的加深和提高。

On depending on author's perception of teaching 《analytical geometry》,raising a warning about the phenomenon of student's neglect of the use of vector in exercise,this essay elucidate the preponderance of vector in solving problems about space.

在中学，解析几何课程主要研究平面上一些点、线的几何位置和几何性质，所涉及的点、直线、曲线均共面，它们都落在坐标系所在的平面内。

After getting these four line-of-sight vectors, we inverse these data in special observation coordinate based on space analytical geometry, then we can get the vector that has three components on every coordinate, this vector will be treated as the total wind profile in the three-dimensional observation field, the result of this four-point method can basically reflect all the spatial and temporal variation of the atmospheric wind.

在得到视线方向风速矢量后，从选定的三维观测坐标系对这四个矢量进行空间解析几何的运算，可得到观测坐标系的各坐标轴上四个测量矢量的各坐标分量的标量和。从而以这个在三个坐标轴上都有分量的矢量作为在观测视场内的总的风场的风速矢量。

So the Poynting vector and wave vector are antiparallel, consequently, the light is refracted negatively, and also there are many other unusual behaviors in LHM like reverse Cerenkov radiation, contrary Doppler effect etc.

所以近年来有关左手材料的研究受到了广泛的关注。2002年，科学家们发现当光波以一定角度入射到在光子晶体界面上时，光波在光子晶体中的传输也会出现和在左手材料中相同的现象：比如负折射和超透镜现象。

Research show that wavelet varied-grid feature vector is characterized by high-stable and high-distinguish. Based on this vector the apery cognitron has solved the harmony of single-classifier and multi-classifier and the harmony of multi-feature. The data shows that the recognition rate and reliability has been effective improve.

实验数据表明，小波变网格特征向量具有稳定性高、区分性强的特点，基于此的智能字符识别机解决了单、多分类器协调和特征协调问题，在应用快速二值化方法加强处理实时性的同时有效地提高了车牌字符的识别率和识别可靠性。

It is the aim of this book to present various basic and important results of vector optimization in an abstract mathematical setting and to demonstrate its usefulness in vector approximation and cooperative differential game theory.

本书的目的是在抽象数学柜架下给出向量优化的各种基本和重要结果并阐述它们在向量逼近和合作微分对策理论中的应用。

A pair of primers was designed according to the coat protein gene of Arabis mosaic viru and used to amplify a 990 bp partial gene of the cp by reverse transcription-polymerase chain reaction, the 990 bp partial gene was cloned into the pEGX-9p-1, a prokaryotic expression vector fused with GST. The recombinant vector was transformed into E. coli BL21. The fusion protein was successfully expressed in E. coli BL21 induced with the IPTG at 37℃.

依据报道的ArMV外壳蛋白基因(coat Protein， Cp)序列设计引物，通过RT-PCR 扩增得到长约990bp的ArMV cp基因亲水基团部分片段，将目的片断克隆到原核表达载体pEGX-6p-1中，构建ArMV cp基因与GST蛋白融合表达载体pEGX-cp，重组载体化大肠杆菌BL21，经IPITG诱导后，融合蛋白GST-cp得到了特异表达。

This algorithm firstly translates arbitrary parameter curves into the piecewise cubic-degree Bezier curves, then using the properties of Bezier curve we can get the tangent vector and the normal vector of every point on the approximation curve, and calculate the approximating offset curve.

此算法先将任意形式的参数曲线转化成分段三次Bézier曲线，利用Bézier曲线的性质容易得到逼近曲线的切向量和法向量，从而计算出其等距逼近曲线。

There is extensive application, especially two-dimensional、three-dimensional vector quantity in a lot of fields of modern mathematics in the vector quantity, they have a form of expression of the array, there are ocular geometry meanings, so can become the effective tool which study the geometry problem of middle school.

向量在近代数学的很多领域中都有广泛的应用，特别是二维、三维的向量，它们既有数组的表现形式，又有直观的几何意义，因此能成为研究中学几何问题的有效工具。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新