查询词典 wide band

The GaAs, InP-based III-V compound semiconductors, which are known as their wide band-gaps, direct-band transition, high photoelectric conversion efficiency and high saturated electron drift velocity and mobility, become increasingly important and have been widely used in microelectronics and optoelectronics.

以GaAs，InP为主Ⅲ-V族化合物半导体材料具有很宽的带隙，大都为直接跃迁型能带，光电转换效率较高，以及具有很高的饱和电子漂移速度和迁移率。

In this paper, we report the progress on energy band structure studies of wide-band-gap semiconductors in NSRL.

以GaN、SiC和ZnO为代表的宽带隙半导体材料，是继Si和GaAs之后的第三代半导体。

In this paper,we propose a modified SC-SSF(spectral correlation-signal subspace fitting)method to estimate DOA of coherent narrow band or wide-band signals,while the advantage of SC-SSF method still rematins.

提要 本文提出一种修正的SC-SSF方法。该方法适用于宽带和窄带源，不仅可解决循环相关源的问题，而且具有更好的噪声抑制特性。

Keeping in mind the variety of connection speeds the system has a wide range of probabilities for each one, from modem at 56kbps, until wide band for cable, the description and characteristics included for each station will allow you to determine if the station that you want to syntonize is adapted or not to the type of available connection.

同时考虑到不同的连线速度该系统具有广泛的概率为每1 ，从在56 Kbps或调制解调器，直到宽带电缆，描述和特点，包括为每个站将允许您以确定是否该站您想要的以syntonize是适应或不类型的可用连接。

The underskirt was of heavy contrasting fabric and color,either edged with a wide band of embroidery or band of velvet.

与外裙在面料和色彩上有着鲜明对比色的里裙带有刺绣宽边或者天鹅绒

The underskirt was of heavy contrasting fabric and color, either edged with a wide band of embroidery or band of velvet.

与外裙在面料和色彩上有着鲜明对比色的里裙带有刺绣宽边或者天鹅绒镶边。

Meanwhile, whether narrow band or wide band and whether coherent or not, the method can work well.

这些结论对于考虑处理算法在有限数据点时的性能具有一定的指导意义。

Graduate University of the Chinese Academy of Sciences, Beijing 100039, ChinaThe partial dispersion of some typical glasses working on near infrared band was calculated with the formulas in which P and V were modified. The apochromatism of a wide band system was designed and analyzed.

利用修正的部分色散和阿贝数公式，计算一些典型的普通光学玻璃在450nm～950nm波段的色散特性，应用二级光谱理论，采用普通光学材料，设计了一个复消色差系统，分析近红外波段光学系统的二级光谱特性及校正方法，给出设计实例。

A design and implementation method of the high speed modulation system, which adopted the new techniques of the FPGA and DAC based communication system,is presented in this paper. The effect of the key techniques of this system, such as the high speed digital signal processing for modulation, high speed based-band signal conversion, wide-band modulation, carrier suppression, high frequency and high precision system clock generation, is analyzed, and the solutions and performance analysis is also given. Finally, a high speed modulation system for space applications is implemented, can be used for high speed data transmission with QPSK, 8PSK, QAM or other kinds of digital modulation.

本论文依据正交调制原理，采用基于FPGA和DAC的设计技术，提出了一种高速、灵活的调制系统的设计方法，重点分析了系统组成的调制编码映射、基带脉冲信号转换、信号滤波、调制、系统时钟产生等关键技术环节的影响，解决了高速调制信号处理、高速数据转换、宽带调制、载波抑制、高频率高精度系统时钟的产生等关键技术问题，完成了一种适用于空间应用的高传输速率、多进制数字调制方式和调制体制灵活的数据传输调制系统的设计与实现，可在硬件设计不变的情况下，实现QPSK、8PSK和16QAM等多种调制方式的高速数据传输，QPSK调制速率达到500Mbps。

Time-frequency analysis method is an effective method of identifying the narrow-band interference in the wide-band spread spectrum signal.

时频分析是识别宽带扩频信号中窄带干扰的有效方法。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。