查询词典 vector field

In the space without any electricity the static electric field can be described not only by scalar potential ,but also by vector potential.

讨论了在无电荷存在的自由空间，不仅可以用标势描述静电场，而且可以引用矢势描述静电场。

In the fourth chapter, using the magnetic vector potential as the unknown variable, a mathematical model for numerical calculation of the magnetic field and loss distribution in 3-phase 5-limb transformer core is presented.

第三章针对变压器铁心结构的特点，对各向异性非线性边值问题的有限元分析方法进行了详细的阐述，并推导出了实用的N-R格式及单元分析格式，对具有多媒质单元的有限元分析方法进行了介绍，为变压器铁心磁场及损耗分布的数值计算奠定了基础。

Vector transducer is a kind of transducer which can provide both the information about pressure and particle velocity of sound field.

矢量水听器是一种不仅能够测量声场中的声压信号还能测量其质点振速信号的接收换能器。

In field oriented vector control of permanet magnet linear synchronous motor,the knowledge of θ,the angle between the d-q reference frame,and the frame of motor winding,is fundamental.

0引言永磁同步直线电机直接驱动系统具有推力大、效率高、结构简单、定位精度高和反应速度快等特点，在自动化仪表、计算机辅助设备、自动化机床、工业机器人等场合都获得广泛应用。

In many CFD computations, no-slip boundary conditions are imposed on the velocity field. On these boundaries, the fluid velocity vector is zero.

在许多计算流体力学计算中，存在非滑移边界，这种边界上流体的速度为0。

This causes that different field of view has different object distant,which results in heterogenic image motion vector on the film.

画幅相机由于横向视场较大，使得每幅横向各个视场目标对应物距各异，最终导致目标像相对探测器产生了异速像移。

The principle of TDTC and the field-weakening method are introduced. The space voltage vector PWM overmodulation method suiting is adopted. IDTC is extended to the whole speed range. This scheme is proved by experiments.

本文介绍了改进型直接转矩控制的基本原理，加入弱磁控制算法，同时采用一种适合工程应用的空间电压矢量PWM过调制算法，将改进型直接转矩控制扩展到全速度范围。

A newly developed three-dimensional holographic vector of atomic interaction field（3D-HoVAIF）was used to describe the chemical structure of 200 aromatic compounds with toxic effect on Tetrahymena pyriformis.

采用新型的的三维原子场全息作用矢量（3D-HoVAIF）研究了200种芳香化合物的化学结构与其生物毒性的定量构效关系。

The stratification shows, as expected, that for this 8 sunspot, its stratification of the vector magnetic fields has the main features of this kind: one umbra with positive polarity and the other with negative polarity; and the magnetic field vectors in the penumbra part between the two umbrae are more horizontal than those in the umbrae.

反演得到的δ型黑子的矢量磁场两层结构拥有δ型黑子的主要特征，两个黑子本影磁场极性相反，且本影之间的半影磁场的磁倾角很大，也就是在半影中磁力线几乎水平分布。

For 2p〓-periodic binary sequences, a new weight function, according to the above presented vector expression of the linear complexity, is defined. By analyzing the weight of the product of a special kind polynomial in finite field, the upper and lower bounds on minimum error, expressed by the here denned weight of the linear complexity, are given in different cases.

对于2p〓-周期二元序列，利用所给出的线性复杂度的向量表示定义了一种新的重量函数，通过研究有限域上一类特殊多项式乘积的重量，分情况给出了用线性复杂度的重量表示的最小错误minerror的上界和下界，这里的重量是由我们所定义的重量函数确定的。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。