We introduce the concept of time-variable directional field, and establish the stable and unstable theorems by the qualitative method.
引入了时变方向场的概念，用定性方法建立了稳定及不稳的定理。
The results indicate that this shielding effect has obvious difference to the different directional field. The coil case presents relatively strong shielding ef...
研究结果表明，线圈盒对磁场的屏蔽效应因磁场的方向不同有很大的差别，线圈盒对切向磁场的渗透呈现较强的屏蔽效应。
The young turtles, however, use the field primarily as a source of directional information for maintaining a heading.
然而，幼小的海龟主要利用磁场作为维持前进方向的信息来源。
Vector field is important conception in science and engineering, which describes directional information of physical procedure and developing trends of states.
向量场是科学和工程中的重要概念，描述物理过程中的方向信息和状态的变化趋势。
The authors deal with the working and imaging principles and technical specifications of the 3D directional borehole radar in details and, combined with field data, show its true application results.
笔者对3D定向钻孔雷达系统的工作和成像原理、技术规格进行了详细说明，并结合现场数据说明了其实际应用效果。
Fieldbus is a digital, bi - directional, poly - branched communication network connecting field devices in automation control system.
现场总线是连接现场设备和自动化系统的数字式、双向传输、多分支结构的通信网络。
Some components of the directional distribution of sound field can be calculated from the measured distribution.
根据测量的分布可推知被测声场方向性分布中的某些成分。
The numerical results for directional responses of the system are checked against measured responses in field tests and the CSTT (Center for Surface Transportation Technology) model.
系统方向性响应的数值计算结果与实验现场测试结果以及CSTT（加拿大国家研究会路面运输技术中心）模型进行了校核。
Along with the research of high speed train, problems occur in its control field, some are popular issues, some directional.
随着高速列车课题研究的开展，高速列车控制中也遇到一些带有方向性和普遍性的问题。
Considering that the Instantaneous Field of View (IFOV) of infrared seeker is small, a line-by-line directional spiral scan was proposed.
针对红外导引头瞬时视场较小的缺点，提出了分行螺旋式定向扫描技术。
The results indicate that the relative distribution of the field wind wave directional spectrum energy is closely related to the corresponding types of wave state.
结果表明，实测风浪方向谱能量的相对分布与相应的波场类型密切相关。
The Field Bus is a full digital, multiple variable, and bi-directional communication system with multiple stations.
现场总线是用于现场设备和中央控制室控制设备间的一种全数字、多变量、双向、多站的通信系统。
Directional technology of cross-country running train especially, must go on in field, school it is impossible for playground to replace.
尤其是定向越野跑的技术训练，必须在野外进行，学校的操场是不可能代替的。
This paper mainly studies the coupling error caused by induction voltage phase difference, and fluctuation of directional sensitivity caused by changes in near-field difference slope.
本文着重研究了因近场感应电压相位差引起的耦合误差，以及近场天线差斜率变化引起的定向灵敏度的变化；
Local directional change of the flow field in the vicinity of spur dike would result in local scouring of spur dike.
丁坝(群)附近的局部流场变化是引起丁坝局部冲刷的根本原因。
The directional characteristic of microphone is an important factor in the measurement of directional distribution of sound field.
传声器的指向性对声场方向性分布的测量有很大影响。
The technique standard of the multiple directional drilling technology in East Sichuan was summed up and verified through field examples.
总结了川东分枝定向井工艺技术规范，并通过现场实例予以充分论证。
Directional stock restructing is a kind of new pattern of enterprise reconstruction, which the field of enterprise and theory are going to employ.
定向股票重组是在美国兴起的一种新的企业重组方式，我国企业界、理论界也在探讨引入这一方式。
It is a policy of controllable vector in directional stator magnetic field that the MW DFIG use.
而双馈异步风力发电机采用的是定子磁场定向的矢量控制策略。
The invention, which pertains to the technical field of environmental protection, relates to a bi-directional sports vehicle suitable for arranging catalyst modules.
一种适用于安装催化剂模块的双向运动车，涉及环保技术领域。
In this paper, the sound field of a more general directional radiator in a stratified medium is treated, and the concept of directivity is applied to calculation of the normal modes.
本文讨论比较一般的指向性辐射器在分层介质中的声场，并将指向性概念应用于简正波计算。
The field application of improved technique showed that the PCP lifting technique is effective in shallow directional wells.
现场应用表明，浅层定向井的螺杆泵举升工艺是可行的。
USB (Universal Serial Bus) is a new interface technology used in PC field, a stylish interface that is Swiftness, Bi-directional, Cheapness, and Hot-plugging.
USB(通用串行总线)是一种应用在PC领域的新型接口技术，是现在非常流行的一种快速、双向、廉价、可以进行热插拔的接口。
The utility model belongs to the technical field of a toy, in particular relates to a bi-directional safety protection positioning mechanism of a toy aircraft.
本实用新型属于玩具技术领域，具体是一种玩具飞机安全保护定位机构。
The paper presents a new method used for optimizing array directional patterns, which is called notch noise-field method.
本文介绍一种处理传感器阵方向图最佳化问题的新方法，即所谓凹槽噪声场法。
The subject problem faced in production in directional well of Wenchang 13-1 oil-field is exactly this kind of phenomenon.
文昌13 - 1油田在生产中所面临的主要问题正是这种现象。
It has been verified that the directional characters in near sound field in low and middle frequency bands and the pressure level in far...
计算结果正确预测出近场中低频段的指向性特点和远场声压级水平，与实测谱值有较好的一致性。
All these conclusions have directional meaning to the designers in this field.
本文所得结论对水电机组的工程设计人员具有重要的指导意义。
All these conclusions have directional meaning to the designers in this field.
本文所得结论对水电机组的工程设计人员具有重要的指导意义。
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