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signal
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  信号
    A MULTISTAGE BP NEURAL NETWORK SIGNAL CLASSIFIER FOR OIL LOGGING
    多级BP神经网络石油测井信号分类器
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    The CZ-1 calibrating signal generator
    CZ-1型标定信号发生器
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    Prestack multi-offset parabolic signal enhancement
    叠前多偏移距抛物线信号加强
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    Grey Filtering of Logging Signal with GM(1,1)Model
    测井信号GM(1,1)模型灰色滤波
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    Useful short-period signal extracted from moderate and longperiod seismometer used in project 837
    837工程中长周期地震计中短周期信号的提取
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    Improving the signal/noise ratio of stacked 3-D seismic data by polynomial fitting method,and the trace interpolation
    3-D叠后地震资料多项式拟合提高噪比和道内插
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    Improving the signal/noise ratio of borehole side-seismic data by making use of VSP data
    利用VSP资料提高井旁地震记录噪比
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    By using this de-noise processing method,the signal to noise ratio of the stacking profile can be in- creased from 1.3936 to 2.1056.
    噪比分析表明,经模拟退火独立分量分析方法去噪处理后,叠加剖面的噪比由1.3936提高到2.1056。
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    Onset Estimation for Seismic Signals with Low Signal to Noise Ratio
    低噪比地震记录中号初至的估计
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    Improving the signal noise ratio of seismic records by orthogonal multiwavelets transformation
    用正交多小波变换提高地震记录的噪比
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  “signal”译为未确定词的双语例句
    Propagational Characteristics for Seismic Wave and Study on the Chaotic Vibrator Detection Method for Weak Signal in Seismic Prospecting
    地震波传播性质及地震勘探弱信号的混沌振子检测方法研究
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    Comprehensive research on the techniques for high signal/noise ratio,resolution and fidelity
    高信噪比、高分辨率和高保真度技术的综合研究
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    High-resolution data processing and high signal/noise ratio data
    高分辨率资料处理与高信噪比资料
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    COMPLEX SIGNAL ANALYSIS OF GROUND PROBING RADAR AND ITS IMPROVEMENT
    探地雷达复信号分析及改进
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    Basic principle of filter and general linear time invariant systemthe basic principle of digital signal processing used in seismology and practical examples (1)
    滤波原理和一般线性时间不变系统──地震学上用的数字信号处理的基本原理与实例(讲座1)
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  signal
In the early 1960s research into radar signal synthesis produced important formulas describing the action of the two-dimensional Fourier transform on auto- and crossambiguity surfaces.
      
It is shown that the one-dimensional sampling sets correspond to Bessel sequences of complex exponentials that are not Riesz bases for $L^2[-R,R].$ A signal processing application in which such sampling sets arise naturally is described in detail.
      
Given a bandlimited signal, we consider the sampling of the signal and some of its derivatives in a periodic manner.
      
We present a method for finding the dual frame and, thereby, a method for reconstructing the signal from its samples.
      
We show that if no sampling of the signal itself is involved, the sampling is not stable and cannot be stabilized by oversampling.
      
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The present paper deals with an elementary principle of a new measurement of runoff with very low discharge by means of resistance measuring-flow, and the nonlinear Flow-Voltage relationships with the resistance measuring-flow. A method of linearization handling is provided to make the Measuring-Runoff Flume in a better linear relationship. The analysis of dynamic response charactertics of Resistance Measuring-flow Flume is based on system dynamics theory, as a result, system parameters ωn and ζ are obtained...

The present paper deals with an elementary principle of a new measurement of runoff with very low discharge by means of resistance measuring-flow, and the nonlinear Flow-Voltage relationships with the resistance measuring-flow. A method of linearization handling is provided to make the Measuring-Runoff Flume in a better linear relationship. The analysis of dynamic response charactertics of Resistance Measuring-flow Flume is based on system dynamics theory, as a result, system parameters ωn and ζ are obtained for judging regulating-storage of measuring-flow device' The Measuring-flow Flume has been applied to measure small discharge in the Hydro-logic Runoff Laboratory. As it belongs to instantaneous flow-rate measurement method, the runoff hydrography measured is very clear as regards its duration, peak discharge, lag of time, and relevant parameters. In addition, the device has a higher stability of electronic circuit and better signal-to-noise ratio, and the problem of electolytic action at electrodes surface due to impurity of the water has been solved, so it is more convenient to make research of the rainfall-runoff relationship in laboratory. Finally, in this paper a comparison of cumulative sum of hydrography from Resistance Measuring-flow Flume with cumulative water-volume-method is given, and satisfactory results have been obtained.

本文就电阻法测流的电压-流量非线性关系进行了探讨,提出了线性处理的方法,并设计了具有良好线性关系的测流槽。加上电测线路的高稳定性与测流系统较优的讯噪比,使得实验室降雨迳流模拟实验的分析研究十分方便。另外,还解决了由于水质不纯而导致的电极极化效应。最后,文章给出电阻法测流与体积法的精度对比结果。

The mechanism of Doppler frequency shifts resulted from variations and movement of ionosphere is analysed, and a general model for the ionosphere involving several factors is assumed. The formulas of Doppler shift due to the reflected signal and that travelling through the ionosphere are thus derived. By using the formulas, the Doppler shifts are related to the variation of electron density of both the ionosphere and the inhomogeneous mass, to the moving velocity of the layer and of the mass, as well as...

The mechanism of Doppler frequency shifts resulted from variations and movement of ionosphere is analysed, and a general model for the ionosphere involving several factors is assumed. The formulas of Doppler shift due to the reflected signal and that travelling through the ionosphere are thus derived. By using the formulas, the Doppler shifts are related to the variation of electron density of both the ionosphere and the inhomogeneous mass, to the moving velocity of the layer and of the mass, as well as to the variation of earth's magnetic field.It is concluded that the movement of a layer would produce generally the Doppler shift proportional to frequency, but this should be considered as a result of variations of the ray path under the bottom of the moving layer. When the radio waves propagate between the earth surface and a satellite in high orbit, the Doppler shift will not be introduced by the movement of the layer.

本文分析了电离层的变化和运动引起多普勒频移的物理机制,假定了一个包含多种因素的电离层模型。在此基础上得到电离层反射信号的多普勒频移公式以及穿过电离层的信号的多普勒频移公式。这些公式把多普勒频移与电离层及不均匀团块的电子密度变化、层和团块的运动速度以及地球磁场强度变化等参数直接联系起来。

In this paper, a specially shaped straingage transducer of a single-degree-of-freedom vibrating system is introduced. In turbulent tlow a forced vibration of the system takes place and gives out a signal proportional to the turbulent velocity.

本文所介绍的传感器,是利用贴有应变片的弹性元件,在紊动水流中产生受迫振动,输出与水流紊动成比例的讯号。这种传感器可以在清水中,又可以在含沙量高达700公斤/米~3的水流中测量水流紊动流速。传感器的测量范围,大约为(2—180)厘米/秒。利用这种传感器可以测山水槽中任一点任一时间间隔的脉动流速,而且还可以在以秒计的短时间内测出水槽中沿垂线的断面流速分布,显示出时均流速的分布规律和紊动强度的分布特征。曾从不同的角度采用多种实验方法来验证,证明所测记录确实代表水流的紊动流速。这种传感器的主要弱点,是在水中测量时,或多或少地要影响水流的原有状态。

 
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