查询词典 rectangular cartesian coordinate system

Domestic and overseas new technologies about conference system based on digital network in recent years are introduced, namely digital processing and transmission, high-frequency and infrared transmission, NOMA, mute corresponding interaction, camera shot auto tracking, video conference system, interactive digital board, multi-assembly-room system control, and audio-video and lighting network centralized control platform technology.

着重介绍近年国内外基于数字网络的会议系统新技术如数字处理和传输、高频和红外传输、NOMA、哑声对应互动、摄像自动跟踪、会议电视、交互数字白板以及多会议室系统控制和声像灯光网络化集控平台等技术，并举出典型的应用实例。

Secondly, three kinds of mathematics model of optical vortex beams were introduced here. Then the propagation dynamics of optical vortex beams through the non-axis symmetry system is studied, this chapter includes the introduction of the symmetry vortex beam and the non- symmetry vortex beam, the deduction of the Collins diffract integral formula for the non-axis symmetry system, and the transformation of the vortex beam passing through the non-axis symmetry system has been described by using the numerical simulation. Then the general calculation for the orbit momentum of vortex beams, the matrix form for the orbit momentum of vortex beams, and the photon method to describe the orbit momentum of vortex beams are also introduced here. Finally, the interference about optical vortex beams was studied.

本文对涡旋光束进行了较为全面的介绍和研究，主要内容包括：（1）光学涡旋光束的基本理论，主要是介绍了单个光学涡旋光束在柱坐标中的一些表征，涡旋光束的奇异相位和光学涡旋的相位结构；（2）光学涡旋光束的三种数学模型；（3）光学涡旋光束在非轴对称光学系统中的传播动力学，其中介绍了对称涡旋光束与非对称涡旋光束，推导了非轴对称光学系统的 Collins 衍射积分公式，并利用计算机模拟图描述了对称涡旋光束经过非轴对称光学系统后涡旋形态的改变；（4）涡旋光束轨道角动量的一般计算，涡旋光束轨道角动量的矩阵形式，光子法描述涡旋的轨道角动量；（5）涡旋光束的干涉。

The result shows that the requirements and testing methods for flammability of building materials are similar between the United State and Canada, and they mainly are engaged in the test of combustibility and flame spread. In European Union, a new classification system for flammability of building materials was implemented in 2001, which includes two systems; one is for floor coverings and the other for all other building units. In Japan, the interior materials are classified into non-combustible, quasi noncombustible and fire-retardant materials according to Cone Calorimeter method (ISO 5660). China has established a non-combustible test, a three-class classification system for combustible wall and ceiling interior finishing materials and a two-class classification system for combustible floor coverings.

通过研究认为：美国和加拿大对建筑材料燃烧性能的要求和试验方法基本相似，他们主要针对材料的燃烧性、火焰传播进行检测；欧盟于2001年颁布了新的燃烧性分级体系，该分级体系包括专门针对铺地材料部分和针对其他所有建筑构件材料和产品部门；日本采用锥形量热计法(ISO 5660)将内装饰材料分为不燃、准不燃和阻燃材料3个等级；我国对建筑材料的试验方法包括不燃性试验方法、墙和天花板内装饰材料的三级分级体系和铺地材料两级分级体系。

For the whole switched system, a suitable switched law is designed to ensure: 1 the state of the closed-loop system, at the time of the transition, resides in the stability region of the mode that the system is switched into; 2 the Lyapunov function for each mode is nonincreasing wherever the mode is reactivated, thereby guaranteeing the stability.

对整个切换系统，设计适当的切换律以保证： 1在切换时刻，闭环系统的状态处在切入系统的稳定区域内； 2切入模块的Lyapunov函数是非增的，从而可保证稳定性。

The joint effect of active and reactive power on the voltage stability of a typical power system was considered by analysing the two parameter bifurcation problem related to nonlinear oscillation phenomena. Numerically, as the active power P1 increases, the Hopf points get closer and eventually coincide at P1=1.455 43 the cyclic fold curve gets closer and closer to the Hopf curve and finally intersects the Hopf curve at a singular point the period-doubling points also get closer and finally coincide at P1≈0.65. The stability behaviour is pre-determined using the normal form approach near the limit point of the Hopf curve. Hence, in the power system attention should be paid to both the consumption of active power and the decrease in the reactive power to prevent nonlinear oscillations. A controller can be designed to absorb some active power and to avoid the nonlinear oscillations that damage the system components.

针对一个典型的单机无穷大电力系统，通过分析系统的双参数分岔的非线性振荡现象，综合考虑有功和无功功率对电压稳定性的影响数值分析表明，随着有功功率的增加，电力系统的Hopf点越来越靠近，最终合为一点在P1=1.455 43处同时圈折cyclic fold 曲线也越来越靠近Hopf曲线，并在Hopf曲线的稳定与不稳定临界点处与Hopf曲线相交倍周期分岔点也随着越来越靠近，最终在P1≈0.65 合为一点应用正规形理论方法，初步确定了Hopf曲线极限点附近的稳定性态因而，电力系统应注意让负荷利用有功功率，减少无功功率的产生以防止非线性振荡另外，可以设计一个稍微吸收网络的有功功率的控制器，以避免因周期振荡而造成电力系统仪器的损坏或电压崩溃

The design of a nonmental ultrasonic detector was introduced. The detector was based on EP2C20 series FPGA chip,through adding NiosII soft processor and other interfaces to FPGA ,equipped with high precision data collection system and TFT LCD module and so on.The system was constituted.It including ultrasonic eradiating,receive sychronously,audio parameter detecting automatically,data analyse and process,display result timely,data storage and data output circuits.For the developing of imaging,intelligent and automation of ultrasonictesting ,a very good foundation is established by the system.

介绍了非金属超声检测仪的软硬件设计方法该仪器以EP2C20系列FPGA芯片为核心，通过在FPGA中加载NiosII软核处理器和其他外围接口电路，配合高精度数据采集系统TFT液晶显示模块等设计而成该仪器集超声波发射同步接收声参量自动检测数据分析处理结果实时显示数据存储与输出等功能于一身，为数据的进一步分析处理和实现超声检测的图像化智能化自动化奠定了良好的基础

At one extreme is the arrangement made in Newfoundland from 1836 to accommodate all numerically represented denominations separately within a loose system (not until 1920 was a unified system of education developed which still works through five denominational subsystems); at the other extreme are the arrangements made in British Columbia which became decisive when it entered the Canadian Confederation to establish and maintain a free unified centralized nonsectarian system.

一个极端是从1836年开始在纽芬兰作出安排以适应一个松散的系统（直到1920年所有面额的数值分别代表着一个统一的教育发展系统，这个系统仍然是通过五个宗派子工作的系统），在另一个极端是在不列颠哥伦比亚省的安排，当这个安排决定进入加拿大联邦时，建立和维持了一个自由，统一的，集中的宗派系统。

A dynamic model was developed with kinematic differential equation derived for a dual-disc over-hung rotor system with rub-impact fault. The stability of the system and stability regions were studied by setting up nonsingular linear transform matrix and by use of Jacobi matrix in combination with the theory of Routh Hurwitz. Then, the effects on the stability regions of the system were discussed with relevant parameters.

建立了悬臂双盘碰摩转子系统的动力学模型和运动微分方程，通过创建该系统的非奇异线性变换矩阵并利用变换矩阵的Jacobi矩阵结合Routh Hurwitz理论，研究了悬臂双盘碰摩转子系统的稳定性和稳定区域，并进行了相应的参数讨论。

The system at higher temperature becomes thermodynamically more stable, and raises the diffusion exchange rate of solvent and nonsolvent at the interface according to the diffusion kinetics. For the PANCMA/DMSO/ system, with the addition of DMSO to nonsolvent, the cloud point curves shifts to the polymer-nonsolvent axis, and the homogeneous phase region is broadened, system becomes thermodynamically more stable and needs more nonsolvent mixture to induce liquid-liquid phase separation.

通过浊点滴定，结合LCP半经验关系，可以得到制膜体系PANCMA/溶剂/非溶剂的三元相图浊点线，考察其相分离过程中的热力学性质，同时考察了溶剂和非溶剂双向扩散传质动力学，从体系热力学和动力学性质出发为PANCMA中空纤维膜的制备以及解释最终的膜结构和性能提供理论依据。

Administrative examination and approval system has not only normal function of system,but also special political function of system.

由于研究视野不同，对行政审批的界定不同，行政审批的内涵有很大的差异。

A small, rubber-headed hammer used in examination or diagnosis by percussion.

叩诊槌用在通过''。'振荡'。''所作的检查或诊断中的橡皮头的''。'小'。''槌

Affixes are limited in number in a language, and are generally classified into three subtypes, namely, prefix, suffix, and infix, depending on their position with reference to the root or stem of the word.

语言中词缀的数量总是有限的，根据它们跟词根或词干的相对位置，一般可以把词缀分外三小类：前缀，后缀和中缀。