查询词典 high frequency wave

Objective: To evaluate the value of high-frequency electric wave on the management of cervical diseases.

目的：探讨高频电波刀治疗宫颈疾病的临床价值。

The article makes a comparison among different types of bus, bus transmission signal and several familiar topologies of front-end converters and load-end converters. Finally, the half bridge converter with full-wave rectifier based on the high-frequency parallel-type AC bus bar is chosen as circuit structure and optimized. The working mode under different condition of the circuit is analyzed and a mathematical model is set up under continuous current mode. Simulation result is used as comparison.

通过对比不同类型的母线、母线传输信号以及各种常见的前端变换器拓扑和负载变换器拓扑，确定了基于并联型高频交流母线的半桥变换器加全波整流作为电路拓扑，并优化了电路的结构，分析了基于不同工作状态下的电路结构并建立电流连续模式的数学模型，并与软件仿真结果进行对比。

The GKS stability theorem for one-dimensional model of hyperbolic initial and boundary value problem, Trefethen's explanation and extension based on the concept of group velocity are generalized firstly. Another possible high-frequency instability mechanism in numerical realization of MTF is pointed out based on his explanation and extension, namely, coupling effect of outgoing harmonic wave along one direction and node motion in the other directions can reverse the energy propagation in multi-dimensional discrete grids.

本文概述了—维双曲型偏微分方程组初边值问题数值稳定性的GKS定理及Trefethen基于群速度概念对这一定理的解释和推广；并应用Trefethen的解释和推广指出了MTF在数值实现中可能出现的另一种高频失稳机制，即在多维离散网格中，沿某一空间方向的外行简谐波，由于与其他空间方向节点运动的耦合效应可以使能量传播方向反向。

The high-frequency ground wave radar plays an important role in both military and civil uses.

高频地波雷达在军事和民用领域发挥着非常重要的作用。

This frontend can satisfy the requirement of spectrum monitoring of high frequency ground wave radar made by Wuhan University.

引 言 高频地波海态监测雷达是一种可以连续地大面积监测海洋状态的先进海洋探测设备。

An ocean echo signal simulation system for verification and calibration of FMICW high frequency ground wave radar is presented in this paper.

该系统基于FMICW高频地波雷达的工作机理，以及一阶和二阶Bragg-Doppler谱的反演原理，利用直接数字合成的技术仿真出海洋雷达回波的模拟信号，以供雷达的校准与定标之用。

During the 9th and 10th 5-year plan,research on high frequency ground wave radar are implementedin national marine 863 project.

我国高频地波雷达的研究在近十年取得了非常大的成就。

The design and realization of the synchro con- troller for high frequency ground wave radar based on the VXI-bus are discussed.

叙述了基于vXl总线的高频地波雷达同步控制器的实现。

High frequency ground wave radar is a land based remote sensing instrument formeasuring marine environment dynamics, developed in recent 10 years.

高频地波雷达是一种近十几年才发展起来的岸基海洋环境动力遥感仪器。

The usual travel time tomography method is based on geometrical ray theory,however,it assumes that the seismic wave has very high frequency,which often makes the tomographic inversion have ill posed problem because of the sparse ray distribution in the model space and finally affects the reliability and resolution of the tomographic results.

基于几何射线理论的旅行时层析方法假设地震波频率足够高，这样往往由于射线存模型空间的稀疏分布，使层析反演问题具有严重的不适定性，从而极大地影响层析成像结果的可靠性和分辨率。

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％。