Design about Amplitude Measuring System for High Frequency Short Pulse of Laser Z-Scan Based on High Speed Parallel A/ D Conversion 一种基于高速并行A/D转换的激光Z扫描的高频窄脉冲信号幅值测量系统的设计
According to the principle of frequency conversion technology, the basic principle of energy-saving of the pumps with frequency conversion for speed regulation was demonstrated, so that it was concluded that the energy-saving effect of speed-control in pump station was superior to that of valve-control. 依据变频技术原理,论证了泵变频调速运行节能的基本原理,从而阐明了泵站运行采用转速控制法比阀门控制法在节能上的优点。
Practice issues such as sampling in depth-time conversion, the relationship between frequency spectrum and wave-number spectrum data, the change of apparent frequency on depth-time conversion section are also discussed. 对深时转换中采样间隔的选择、频率谱与波数谱数据的关系和深时转换剖面上视频率变化等实际问题,给出了合理的解释。
Application of frequency conversion technique of gas fan Opinions on Frequency Conversion Control and Energy Save for Blast and Pump 煤气鼓风机变频技术应用关于风机和泵的变频控制及其节能
The frequency modulation response of wavelength conversion was discussed under the small-signal analysis. 并针对该理论模型,采用小信号分析方法讨论了波长转换的频率调制响应特性;
Selection and Problems Analysis of Motors and Frequency Converters in the System of Frequency Conversion 变频调速系统中电动机和变频器选择及问题分析
The essence of this method is converting the various carrier frequency of the hopping periods to the same carrier frequency by digital frequency conversion, and then the frequency hopping signals are changed to fixed frequency signals. 其基本思想是利用数字变频将跳频信号不同频率的各个跳段信号变频到统一载频上,使其转变为定频信号。
These medicines were also found to decrease the frequency of gene conversion in S. cerevisiae in the presence of hydroxyurea. 这3种中药同时还可抑制羟基脲诱发的酵母细胞的基因转变。
The shortcoming of hard switch is that the power loss of power devices increases with the switching frequency, which is no good for system integration and improvement of conversion efficiency. 在硬开关状态下,PWM功率变换器的致命弱点是开关管开关损耗随开关频率成正比增加,不利于系统的集成和转换效率的提高。
Frequency Chirp Performance of Tunable Wavelength Conversion Based on FWM in a Semiconductor Fiber Ring Laser 基于SFRL的FWM型可调谐波长转换器啁啾特性分析
The effects of both low and high frequency phase perturbation on the threshold of the SRRS effects, the conversion efficiency of Stokes field and the phase of the residual pump field and the Stokes field were discussed in detail. 详细讨论了低频和中高频空间相位畸变对SRRS阈值条件、斯托克斯光转换效率、剩余泵浦光和斯托克斯光相位的影响。
For the life control and management of some internal military aero engine in the service, based on the flight profile and task frequency mixing, the assessment process of comprehensive flight conversion ratio for aero-engine is established, and the assessment method for aero-engine conversion ratio is presented. 为实现国内某型现役军用航空发动机寿命控制与管理,基于实测飞行剖面和任务混频,研究建立了军用航空发动机综合飞行换算率的确定算法和计算流程。
Its hardware shows that the level of its frequency stability is the same as that of crystal oscillator, its frequency range covers over double frequency course and the time of frequency conversion is fast and is on the level of μ s. 实践证明,它频率稳定度高,其数量级与晶振相同,频率覆盖范围大,超过了倍频程,频率切换迅速,转换时间达微秒级。
Equipressure natural gas supply system with frequency conversion possesses the feature and advantages of the scroll compressor with frequency conversion and satisfies the design requirements. 天然气变频恒压供气系统具有变频涡旋压缩机的特点和优点,完全满足设计要求。
Slip frequency as a technique of frequency conversion is finally adopted among several control methods of motor. 在几种常见的电机控制方式中,最终选定了转差频率控制方式的变频调速技术。
According to spinning tension varied characteristics, relationship of spindle speed with spinning tension and frequency is analyzed, influence of frequency conversion adjustment speed to spinning end breakage, yarn hairiness, twist is analyzed also. 根据纺纱张力变化特点,分析了锭速调节与纺纱张力的匹配及锭速与变频器频率的关系;分析了变频调速对纺纱断头、成纱毛羽及捻度的影响情况;
And then we have described how to select operating frequency of the conversion circuit and to design the parameters of main devices in order to ensure lower power loss and higher efficiency. 本文从控制主要元器件的功耗入手,讨论如何选择变换器的工作频率和设计主要器件的参数,以确保电源的低功耗和高效率。
The principle and structure of a fixed displacement pump with frequency conversion drive are introduced. And the output characteristics of frequency conversion hydraulic pump open loop control mode and closed loop mode are verified by test results. 介绍了变频驱动液压定量泵的工作原理及结构:并对开环变频驱动液压定量泵和闭环变频驱动液压定量泵的输出特性进行了实验研究。
This paper introduces the energy-saving analysis of changing water flow by frequency conversion, factors of applying conversion energy-saving to water circulating pumps of center air conditionings and the comparison between the conversion adjustment and the valve lead adjustment. 介绍了变频变水量节能分析,变频节能在中央空调循环水泵中应用的因素,变频调节与阀阻调节的比较,并阐述了知TC-Ⅱ变频节能控制系统的特点,列举了方案。
High Frequency Modulation Characteristic Analysis of Wavelength Conversion Based on External Cavity Laser 外腔激光器实现波长转换的高频调制特性分析
The design method of tester for high frequency C-V Characteristic of MOS structure using frequency conversion technique and integrated chip is introduced. 本文阐述了用高频检测法测量MOS电容的原理,介绍了用变频技术和集成芯片设计MOS结构高频C-V特性测试仪的方法。
Frequency characteristic analysis of optoelectric conversion of optical fiber voltage transformer 光纤电压互感器光电变换频率特性分析
Because of adopting the total digital construction, it has virtues such as the bread frequency band of synthesized signal, the short time of talking frequency the conversion, the high rate of the frequency distinguish and the continuous phase of synthesized the signal etc. 由于采用了全数字结构,它具有合成信号相对频带宽、频率转换时间短、频率分辨率高及合成信号相位连接等优点。
Discussion on the best start-up frequency of conversion regulating speed motor 变频调速电动机最佳启动频率探讨
An analytic form solution is derived by using multisection model to demonstrate small signal frequency response ( SSFR) of wavelength conversion based on cross-gain modulation ( XGM) in SOAs. 通过分段模型,理论推导了基于SOA中交叉增益调制效应的波长转换中小信号频率响应的解析表达式。
In the first part, the band-pass sampling is introduced before everything, which is the theory foundation of intermediate frequency sampling. After that, the realization of digital frequency down conversion and main components used are discussed. 首先,介绍了中频采样的理论基础带通采样,讨论了数字下变频的实现方法,以及使用的主要元器件。
In addition, in many air conditioning water systems with frequency conversion control, the basis of water pump frequency conversion control& differential pressure water system monitoring location choice is varied, leading to circulating pump energy consumption of different sizes. 另外,在许多变频控制的空调水系统中,水泵变频控制的依据&水系统压差监测点位置的选择也多种多样,导致空调水系统循环泵能耗大小不一。