查询词典 power transmission

Indeed, for some decades now, power line wires have been ? used for low-speed data communication, culminating in such standards and products as LonWorks, CEBus, and X-10, as well as many proprietary systems for the transmission of control and management signals.

事实上，在最近的几十年，电力线已经被用于低速数据通信，在Lon Works，CEBus，and X-10等电力线标准中都有提及和应用，特别是在一些特定系统中用于传输控制和管理信号。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

The selflock conditions and the selecting range of transmission ratio of power in closed epicyclic gear trains can be used in common differential gear trains, too.

本文基于啮合功率法推导出封闭周转轮系效率计算的统一公式，大大简化了封闭周转轮系效率计算难度。

Closed epicyclic gear trains possesses many advantages such as light in weight, impact in structure, broad in speed ratio transmission, large in transmitting power and so on.

封闭周转轮系具有体积小，重量轻，结构紧凑，速比范围宽，传动功率大等优点，广泛应用于工程机械、纺织机械、矿山机械、火炮变速装置和机器人机构。。。

In the Prius, a single planetary gearset within the variable-ratio transmission splits the gasoline engine's power, routing it to drive the wheels or to charge the batteries for both city and highway driving.

在 Pirus 上，安装在变比传动总成里的一个单独的行星齿轮箱负责分配汽油引擎的动力，在城市或者高速公路行驶种驱动车轮或者给电池充电。

This paper analyses the theory of constant power control of hydrostatic transmission with secondary regulation whose realizing methods are given.

分析了二次调节静液传动系统恒功率控制的原理和实现的方法，在给出数学模型的基础上进行了仿真研究，为该系统的复合控制研究奠定了基

The prototype has achieved Long-distance power supply by data bus, IEC61158-2 transmission technology and essential function of PROFIBUS-DP and can be connected to DP fieldbus system for transparent communication between the two sort of feildbus segment by DP/PA coupler and can be communicated with the DP master inerrably and continuously according to the primary PROFIBUS-DP communication protocol and process realization of state machine.

论文取得的主要成果包括：在国内目前允许的技术条件下，找到了一个PA产品开发的可行性方案，设计出能够通过数据总线进行远程供电PA原理型样机，实现了IEC61158-2传输技术以及PROFIBUS-DP基本功能，能够通过DP/PA耦合器将样机接入DP总线系统实现两类总线段间的透明传输，并按照状态机过程实现与主站的连续正确通信。

On the basis of introducing several normal methods of monitoring landslide,the article provides the automatically collecting system of a reservoir district landslide based on SMS wireless transmission. The power supply of this system is solar battery with dampproof and lightningproof measures. This system is characterized by cheap cost,high reliability,easy extension and maintenance.

在介绍常规滑坡监测方法的基础上，提出了基于SMS无线传输的水库滑坡自动化采集系统，该系统使用太阳能供电，采取了防潮、防雷击等措施，具有成本低廉、性能可靠、组网灵活、维护方便等特点；适合交通不便，无交流供电但有手机信号的偏僻地区进行远程非实时监测。

ABSTRACT Analysis of the time-domain response of multiconductor transmission lines is important for the design of interconnects in high-speed integrated circuits, in electrical power distribution systems, and in electromagnetic pulse investigations.

高速电路中的连接线通常是由多导体传输线构成，其时域响应的分析对高速电路系统的总体性能指标的保证及系统的设计关系极为重要，同时其理论和计算方法也可用于电力传输系统中的瞬态分析及电磁脉冲的研究等多个领域。

Multiconductor transmission line model is usually used to analyze this problem, but MTL model can be no avail to the electromagnetic transient simulation program that is usually used in power system.

研究VFTO对变压器的影响通常采用多导体传输线模型，但这种传输线模型无法用电力系统中通用的电磁暂态仿真程序EMTP进行分析。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。