查询词典 high frequency

For reducing boundary distortion area, the elevations of grid DEM are viewed as a discrete sequence under a generalized coordinate, so that the boundary problem of two-dimensional discrete wavelet transform is turned into the boundary problem of one-dimensional discrete wavelet transform, which not only greatly reduces the boundary distortion area, improves the precision of reconstructed DEM data near the boundary, but also decreases the number of zeros adding on the boundary for wavelet transform, and boosts the compression ratio. On the basis of analyzing the distribution characteristics of coefficients in low and high frequency bands, a mixed entropy coding plan is applied, and a high efficient quantizator called"self-adaptive hard threshold"is established, which is helpful for improving the precision of the reconstructed DEM data and for enhancing compression ratio.

为了减小小波变换山区格网DEM数据压缩中边界失真区域，将山区格网DEM高程值视为广义坐标下的离散随机序列，把二维离散小波变换中的边界问题转换为一维离散小波变换中的边界问题，不仅大大减少了小波变换边界失真区域，提高了重构DEM数据边界点的精度，而且减少了边界补零个数，提高了压缩比；通过对山区格网DEM数据小波变换低频区和高频区变换系数分布特点的分析，采取了霍夫曼—游程混合熵编码方案，设计了高效、低失真的"自适应硬阈值"量化器，即对低频区变换系数不进行量化，直接进行霍夫曼编码；对高频区变换系数则先用"自适应硬阈值"方法量化处理，再进行游程编码。

Innovative high-frequency technology with 300 kHz for constant high beam quality.

利用300 kHz的创新高频技术可获得恒定的高光束质量。

In this article a new system of real time weight measuring equipment with high precision and high frequency is introduced.

摘 要：介绍了一种新型的高精度、高频率的实时计量系统。

It has a high density of active volcanoes, and a high frequency of volcanic eruptions.

它有高密度的活火山与高频率的火山爆发活动。

High frequency ultrasound groin mass in the inguinal hernia,hydrocele,cryptorchidism has high rate of accurate diagnosis of benign and malignant lymph nodes.

高频超声对腹股沟肿块中的腹股沟疝、鞘膜积液、隐睾诊断准确率高，对淋巴结的良恶性诊断准确率较高。

Division I is a professional manufacturer of high-high frequency induction heating equipment.

我司是专业生产高频感应加热高设备。

High-frequency UPS has an excellent input characteristic, high power density and low cost, so it was popular. But because of the low output impedance, the parallel control is more difficult.

高频UPS 凭借其输入特性好、功率密度高、成本低等优点逐步得到推广应用，但系统输出阻抗低，并联控制较为困难。

In order to investigate and develop advanced flight simulator with high fidelity and provide the simulator with actual and reliable navigation data, the data structure requirements of navigation database for the system of flight simulator prototype are presented. These requirements including the airport, runway, very high frequency omnidirectional radio range, instrument landing system, distance measuring equipment system, nondirectional beacon and marker beacon.

为了研究开发高逼真度的飞行模拟器，并为之提供真实可靠的导航数据，提出了飞行模拟器原型系统导航数据库的数据结构要求，即机场、跑道、甚高频全向信标、仪表着陆系统、测距仪系统、中波导航台和指点信标的数据结构要求。

This invention relates to a DC linear motor digital controller including a central processor circuit, a data memory, a program memory, an A/D conversion circuit, a D/A conversion circuit, a linear shift orthogonal code pulse signal circuit, a signal isolation circuit, among which, the center processor circuit is composed of a special DSP chip controlled by the motor, a complicated programmable logic device CPLD combining with a peripheral expanding circuit, said digital controller fully utilizes the motor to control the special DSP chip to integral DSP kernel CZXLP and the rich external circuit in a single chip to make up of a digital controller for controlling high frequency response DC linear motor with small volume, low dissipation and high reliability.

高频响直流直线电机数字控制器，属于电机自动控制技术领域，目的在于获得快速、高精度往返运动的控制效果，实现高频响直流直线电机的精密位置跟踪控制功能。本发明包括中央处理器电路，数据存储器，程序存储器，A/D转换电路，D/A转换电路，直线位移正交编码脉冲信号电路，信号隔离电路；中央处理器电路由一个电机控制专用DSP芯片，复杂可编程逻辑器件CPLD，结合外围扩展电路组成。该数字控制器充分利用电机控制专用DSP芯片将高性能DSP核C2xLP和丰富的功能外设电路集成在单个芯片上这一特点，构成了一个体积小、功耗低、可靠性高和功能比较齐全的高频响直流直线电机控制用的数字控制器，使系统的整体成本大大降低。

Using the normal planar technology of bipolar junction transistor,we have fabricated the p n p high frequency,high breakdown voltage transistors which can operate in the wider temperature range from -55℃ to 180℃.

一、引言新器件的设计基于以下三方面的考虑：（1）众所周知，常规双极结型晶体管的hFE随温度上升而增大，具有正的温度系数，特别在较高温度更为严重。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！