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signals
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     Parameter Estimation For Several Complex Signals Using Higher-order Cyclic Statistics
     几种复高阶循环平稳信号的参数估计研究
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     Study of Time—Frequency Analysis and Processing of No—stationary Signals
     非平稳信号的时频分析与处理方法研究
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     Nonlinear Adaptive Prediction Technologies of Chaotic Signals and Its Applications
     混沌信号的非线性自适应预测技术及其应用研究
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     Multi-parameter Estimation Technology of Wide-band Array Signals Based on High-order Cumulant
     基于高阶累积量的阵列信号多参数估计技术
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     Preparation of the agonist/antagonist monoclonal antibodies against B7 and CD28 molecules and analysis of their effects on costimulatory signals transduction
     B7:CD28激发/拮抗型单抗的研制及其在共刺激信号传导中的调节作用研究
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  信号的
     Parameter Estimation For Several Complex Signals Using Higher-order Cyclic Statistics
     几种复高阶循环平稳信号的参数估计研究
短句来源
     Study of Time—Frequency Analysis and Processing of No—stationary Signals
     非平稳信号的时频分析与处理方法研究
短句来源
     Nonlinear Adaptive Prediction Technologies of Chaotic Signals and Its Applications
     混沌信号的非线性自适应预测技术及其应用研究
短句来源
     Study on Chaotic Measuring of Signals
     信号的混沌测量研究
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     The Algorithms Research of ECG Signals Intelligent Detection & Analysis for Mobile Cardiac Telemonitoring System
     移动心电监护系统ECG信号的智能检测与分析方法研究
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  “signals”译为未确定词的双语例句
     Algorithms for Modulation Recognition of Digital Communication Signals
     数字通信信号调制识别算法研究
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     A Study on Blind Separation of Underwater Acoustic Signals
     水声信号盲分离技术研究
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     Multiwavelet Theory and Its Application Study in Power System Fault Signals Processing
     多小波理论及其在电力系统故障信号处理中的应用研究
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     A Study on Matched Field Processing of Underwater Acoustic Signals
     水声信号的匹配场处理技术研究
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     Prediction of Chaotic Time Series and Application of Chaos Theory in Modulation Recognition of Communication Signals
     混沌时间序列预测及其混沌理论在通信信号调制识别中的应用
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  signals
They are potential tools for the decomposition and handling of signals that, like speech or music, seem over short intervals to have well-defined frequencies that, however, change with time.
      
Multiresolution Analysis and Multivariate Approximation of Smooth Signals in CB(Rd
      
Frame Analysis of Irregular Periodic Sampling of Signals and Their Derivatives
      
Unique reconstruction of band-limited signals by a Mallat-Zhong wavelet transform algorithm
      
The radar ambiguity function plays a central role in the theory of radar signals.
      
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As in general in all time service works, the problem is to obtain and keep an accurate time, to determine the corrections of standard clock and to transmit time signals. This present report is concerned only with the last two items. At Zi-Ka-Wei Observatory, radio method was introduced into time service in 1914. Some rigorous changes occured in 1926, a number of instruments were installed. Many of them are still in use. In 1940, the observatory began to transmit rhythmic signals twice a day. From...

As in general in all time service works, the problem is to obtain and keep an accurate time, to determine the corrections of standard clock and to transmit time signals. This present report is concerned only with the last two items. At Zi-Ka-Wei Observatory, radio method was introduced into time service in 1914. Some rigorous changes occured in 1926, a number of instruments were installed. Many of them are still in use. In 1940, the observatory began to transmit rhythmic signals twice a day. From then on until December 1950, no further developments were made. The main instruments we had in 1950 were: a 80mm Prin transit with impersonal micrometer, two Leroy pendulums as standard clocks, three astronomical clocks and their slaves, equipments for receiving and recording time signals, etc. Since 1952, we began to make some improvements, especially on rhythmic signals. First, we converted a common clock into a "transmitting clock" to obtain 61 impulses in every minute and second by making use of photoelectric arrangement (Fig. 1), we succeeded to raise the accuracy of our signals. To improve signal accuracy further, we have to deal with various sources of errors which are conditioned by our equipments. The most important among these are: 1. error in prediction of corrections of the standard clocks, 2. error in the adjustment of the transmitting clock and 3. time lag in transmission. In consequence of last three-year's research, these errors are reasonably reduced. The first two are now±0~s.007 and ±0~s.005 respectively and the last is small. Accordingly, the deviation of time signals XSG has been supposed to be±0~s.01. However, this is not enough for the requirement. The more efforts are being made to bring further improvements. But as the requirements for signal accuracy is far above what the present installation can offer, some new equipments are ordered and they will joint in force with the old ones in the nearest future. Since February 1954, Zi-Ka-Wei Observatory has cooperated with the time service departments in Soviet Union. This has been helpful to our works in every way.

授時包括测時、守時和播時三个主要方面。在時號的发播中包含了预報主钟改正量的差误,工作钟的調節誤差和電路遲滯变化等三种誤差。如果使用石英钟及有關设备,这就可基本解决。各台站在其天文观测基础上订定的時號改正數也包含有偶然差和系统差,比較全面解決的只有蘇聯和国際時間局这两个标准系统。徐家匯觀象台授時工作歷史很久,作了一些工作,但抗戰以來,郎停滯不前,直到人民政府接办,才逐步在原有基礎上開展了改進。幾年来主要是改裝了一具工作钟,裝置光電设备以发播科学式時號,對時号精确度解决了秒距誤差和五分间誤差。工作钟的调节誤差被其本身品質所限,仍未解决,只是在加強值班工作之后,有了一定限度的提高,目前約為±0~s.005,在预报主钟改正量時,也有很大程度的不稳定,約為±0~s.007。所以時号的精确度在±0~s.01左右。要进一步提高质量,满足要求,有待於新設備的增添使用。在時号改正數方面,所存在的相當大的系统差,可採用蘇聯或国際時間局系統的改正數來避免。

The principles of obtaining optimum design for R-C coupled pentode ampli- fiers are obatined. It was shown that for small input signals, operation is limit- ed in so small a portion of the characteristic that much smaller than usual grid bias may be used to obtain higher trangconductance, and consequently higher gain; whereas for large input signals,non-linearity of the characteristics limits the maximum output obtainable. Therefore, design should be different for small and for large input signals....

The principles of obtaining optimum design for R-C coupled pentode ampli- fiers are obatined. It was shown that for small input signals, operation is limit- ed in so small a portion of the characteristic that much smaller than usual grid bias may be used to obtain higher trangconductance, and consequently higher gain; whereas for large input signals,non-linearity of the characteristics limits the maximum output obtainable. Therefore, design should be different for small and for large input signals. After the load resistance was obtained from other considerations, it was shown how the required optimum voltages on the screen grid and for grid bias can be obtained from the standard characteristic curves of pentodes given in radio tube handbooks. Concrete examples are used in elucidat- ing these principles.

根据几个合理的假定,我们可以用分析方法求得电子注功导管(或五极管)的调幅特性。证明要得到没有畸变的调幅,必须使阳极电压、屏栅极电压、栅偏压和栅极激励用上压同时加以调制。所要求的调制方式都是很近于同比例的。实验上,这样的四重调制可以用很简单的线路和不需要任何特殊设备得到。本文也讨论了用这种调制方式的其他优点。

This article introduces a new circuit of wide band square-wave generator, producing square-waves from 15 Hz to 1.2 MHz in seven steps, with rise time, of about 0.04 μs., the highest out put-signal level being13.5 v. peak to peak.Finally, some experimental examples of square-wave application are given.

本文介绍一个矩形波发生器的新电路,可以产生七种不同频率(由15赫至1.2兆赫)的矩形电压,建立时间约0.04微秒,轮出的最大振幅达13.5伏。后面还提出一些应用矩形电压的实验范例。

 
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