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时间域     
相关语句
  time domain
    Extracting the minimum phase spectrum of signal by Hilbert transform in time domain,
    用时间域希尔伯特变换求取信号的最小相位谱
短句来源
    Principles of Radon transformation methods, including linear Radon transform in time domain, least square Radon transformation and high-resolution Radon transformation in frequency domain are discussed.
    讨论了时间域线性Radon变换、频率域最小平方Radon变换和频率域高分辨率Radon变换等方法的基本原理。
短句来源
    Suppression of single-frequency interference wave in time domain.
    时间域单频干扰波的压制
短句来源
    FULL WAVEFIELD INVERSION OF ANISOTROPIC ELASTIC PARAMETERS IN THE TIME DOMAIN
    时间域全波场各向异性弹性参数反演
短句来源
    Frequency attributes characters of seismic traces in time domain and division of stratigraphic sequence.
    地震道时间域频率属性特征和地层层序划分
短句来源
更多       
  time-domain
    INVERSION OF TIME-DOMAIN AIRBORNE ELECTROMAGNETIC DATA
    时间域航空电磁数据的反演
短句来源
    Method of Full Migration of Pre-stack Time-domain and Its Application
    叠前时间域全偏移处理方法与应用
短句来源
    TIME-DOMAIN AND FREQUENCY-DOMAIN THREE DIMENSIONAL TENSOR GREEN'S FUNCTION IN A HOMOGENEOUS CONDUCTIVE HALF SPACE AND ITS APPLICATION
    均匀导电半空间中频率域和时间域三维电张量格林函数及应用
短句来源
    Time-domain modeling of constant-Q seismic waves using fractional derivatives
    应用分数阶微分对地震波稳恒Q值的时间域模拟
短句来源
    Recently Transient Electromagnetic Method (TEM), as a kind of time-domain electromagnetic prospecting approaches, has experienced a period of rapid development and been widely applied.
    瞬变电磁法(简称TEM法)是近年来发展很快并得到广泛应用的一种时间域电磁勘探方法。
短句来源
更多       
  in time domain
    Extracting the minimum phase spectrum of signal by Hilbert transform in time domain,
    用时间域希尔伯特变换求取信号的最小相位谱
短句来源
    Principles of Radon transformation methods, including linear Radon transform in time domain, least square Radon transformation and high-resolution Radon transformation in frequency domain are discussed.
    讨论了时间域线性Radon变换、频率域最小平方Radon变换和频率域高分辨率Radon变换等方法的基本原理。
短句来源
    Suppression of single-frequency interference wave in time domain.
    时间域单频干扰波的压制
短句来源
    Frequency attributes characters of seismic traces in time domain and division of stratigraphic sequence.
    地震道时间域频率属性特征和地层层序划分
短句来源
    THE RECOGNITION AND SUPPRESSION OF SINGLE FREQUENCY INTERFERENCE WAVE IN TIME DOMAIN
    时间域单频干扰波的识别与压制
短句来源
更多       
  the time domain
    FULL WAVEFIELD INVERSION OF ANISOTROPIC ELASTIC PARAMETERS IN THE TIME DOMAIN
    时间域全波场各向异性弹性参数反演
短句来源
    (5) find the time domain wavelet by solving the linear matrix equation.
    (5)在较为准确地求得子波的相位谱后利用线性方程组求得时间域子波。
短句来源
    Using full-wave model phase analysis and instantaneous spectrum analysis in the time domain, moro detailed studies of the ultrasonic model tests were carried out to get the features of the elastic wave motion and dynamics before and after the break of concrete foundation piles, thus obtaining the data about broken foundation piles under testing condition, giving the formulas for locating the places of break.
    本文采用全波模型震相分析法和时间域的瞬时波谱分析法,对弹性波在混凝土桩基断裂前后的运动学、动力学特征,作了较为详细的超声模型实验研究,获得了实验条件下桩基断裂存在的判据,给出了确定断裂位置的计算公式。
短句来源
    The method of simultaneous inversion of multiple echo trains(SIMET) obtains fluids T 2 distribution and volume by using evolution matrix in the time domain.
    多回波串同时反演 (SIMET)评价方法是在时间域应用矩阵变换对CPMG回波串数据进行数值处理 ,得到油、气、水的固有T2 谱分布和油、气、水体积。
短句来源
    Starting with the concept of the resolution of the hi-resolution seismic survey, systematicdiscussion on the relationship between the resolution and the signal-noise ratio and bandwidthand the effects on resolution is presented. Principle parameters and their mutual relation thatinfluence the resolution are analyzed from the time domain and the frequency domain,resulting in that the effective bandwidth and the center frequency are two controlling factorsto increase the resolution.
    本文从高分辨率地震勘探分辨率的概念入手,对分辨率和信噪比与带宽的关系以及影响分辨率的因素作了系统性的论述,从时间域和频率域分析了影响分辨率的主要参数及其相互关系,得出提高分辨率主要是提高有效带宽和中心频率的结论。
短句来源
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  time domain
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
      
A Time Domain Characterization of the Fine Local Regularity of Functions
      
In this paper, the global and local linear independence of any compactly supported distributions by using time domain spaces, and of refinable vectors by invariant linear spaces are investigated.
      
For the finite-difference time domain (FDTD) method, the electromagnetic scattering problem, which requires the characteristic structure size to be much smaller than the wavelength of the exciting source, is still a challenge.
      
The discrete spectrum of the field after continuation is obtained from difference methods for Maxwell's curl equations in frequency-domain, and the time domain solution of the original problem is derived from their inverse Fourier transform.
      
更多          
  time-domain
Hybrid method of combined difference and spectrum for time-domain maxwell's equations
      
To circumvent this difficulty, this paper presents a novel hybrid numerical technique of combined difference and spectrum for time-domain Maxwell's equations.
      
Although the structure of frequency shift filter is more complicated than the time-domain filter, it uses both time correlations and frequency spectrum correlations so it can achieve better performances on separating the overlapping signals.
      
The transient pulse signal fidelity has also been investigated by finite-difference time-domain (FDTD) method.
      
The modified TEM horn antenna with distributed resistor load is presented in this paper, and the radiation properties of the antenna with the shields and absorbers are studied through the three-dimensional finite-difference time-domain (FDTD) scheme.
      
更多          
  in time domain
A super-element approach for structural identification in time domain
      
The wind excitations of the system are the buffeting and self-excited forces simulated in time domain using measured aerodynamic coefficients and flutter derivatives.
      
Searching-and-averaging method of underdetermined blind speech signal separation in time domain
      
A novel searching-and-averaging method in time domain (SAMTD) is proposed.
      
Bypassing the disadvantages of traditional clustering (e.g., K-means or potential-function clustering), the durative-sparsity of a speech signal in time domain is used.
      
更多          
  the time domain
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
      
The discrete spectrum of the field after continuation is obtained from difference methods for Maxwell's curl equations in frequency-domain, and the time domain solution of the original problem is derived from their inverse Fourier transform.
      
A super-element approach is proposed in this study to identify the structural parameters of a large-scale structure in the time domain.
      
The natural excitation technique and the eigensystem realization algorithm were combined to identify the modal parameters in the time domain of a structure excited by simulated ambient vibrations.
      
This procedure is highly efficient in analyzing dynamic structure-foundation interaction problems in the time domain.
      
更多          
  其他


From the point of view of fracture mechanics, we studied the far displacement field produced by a disk-shaped pure shear fracture and obtained an analytic expression for that field. Then, by using this expression we calculated the form of the impulse and its spectrum and found a relation between the corner frequencies fcα,fcβ of the P and 8 waves and the fracturing radius of the earthquake focus, i.e. fcα = 0.6/t2α = 0.6/al/vr + π/4α) and fcβ = 0.45/t2β = 0.45/a(1/vr + β/4β), where t2α and t2β are respectively...

From the point of view of fracture mechanics, we studied the far displacement field produced by a disk-shaped pure shear fracture and obtained an analytic expression for that field. Then, by using this expression we calculated the form of the impulse and its spectrum and found a relation between the corner frequencies fcα,fcβ of the P and 8 waves and the fracturing radius of the earthquake focus, i.e. fcα = 0.6/t2α = 0.6/al/vr + π/4α) and fcβ = 0.45/t2β = 0.45/a(1/vr + β/4β), where t2α and t2β are respectively the average values on the focal sphere of the impulse widths of the earthquake focus of the P and S waves, vr is the velocity of fracturing, taking as 0.775 β;α,β are the velocities of the P and 8 waves. In neglecting the delay factor of theray paths e-iwr/c, the effect of the absorption of the media resembles a minimum phase-shift filter. Employing Hilbert Transform, the frequency response .B(w) =exp of the media was found, in which t*=r/CQ, where r, the distance from the earthquake focus; c, velocity of waves; Q, quality factor of the media and wm, the high cut frequency. This expression is different from that of Futterman. After taking into consideration of the effect of the absorption of the media and the frequency characteristics of the instruments, the earthquake focal dimension 2a and the seismic moment M0 in the frequency domain were obtained. While in the time domain, fast Fourier Inverse Transform was used to get the impulse response of the media and the instruments and then convolved with the impulse of the earthquake focus to construct the synthetic seismogram. From it we can get the relation between the initial half period T2P and the dimension 2a or impulse width t2α of the earthquake focus. Then draw the nomogram for this relation. From the nomogram we can get 2a, the focal dimension. The value is essentially the same as that obtained in the frequency domain.Based on the relation Ms = 21og(2a) +1/1.5, as the outcomeof the study of fracture processes of the earthquake focus in the light of frecture mechanics, we were able to find the regional shear stressτ0 of the Peking-Tientsin-Tangshan-Zhangjiakou area. Here, η, efficiency of rediation of the earthquake, taking as 0.05: v, Poisson Eatio, taking as 0.252; μ, rigidity modulus, taking as 3.3 1011 dyne/cm2. Computations show that before the Tangshan Earthquake of July 28, 1976, the stress value of the Tangshan-Fengnan area was the highest, reaching a value of 870 bars. But in the Changli area, at a distance of about 100 km away, the stress had a value of only 200 bars. After the Tangshan Earthquake, in the Tangshan-Fengnan area, located in the central portion of the earthquake fault zone, To dropped to 100 bars. However, at both ends of the fault zone, the stress was still very high in value, especially at the southwestern end, in the vicinity of Ninghe, the stress value there was 400-500 bars. Until November 15, 1976, a strong aftershock of magnitude 6.9 occurred here, after which the stress value decreased to 200 bars.

作者从断裂力学观点研究了圆盘形纯剪切破裂产生的远场位移,导出了远场位移的解析表达式.用此表达式计算了远场位移脉冲波形及其谱.求得了P波和S波拐角频率F_(cα)、f_(cβ)与震源破裂半径的关系式,t_(2α)和t_(2β)分别是P波与S波的震源脉冲宽度在震源球上的平均值.V_r是破裂速度,取0.775β,α、β是P波与S波速度.介质吸收的影响,假定在略去路径滞后因子e-(iωr)/c后是最小相移滤波器,应用希尔伯特(Hilbert)变换导出了介质的频率响应公式式中,r为震源距,c为波速,Q为介质品质因数,ω_m为高频截止频率.它与富特曼(Futterman)公式是不一样的.在考虑了介质吸收影响与仪器频率特性影响后,在频率域中求出了震源尺度2a和地震矩M_0.在时间域中,利用快速傅立叶反变换求出介质和仪器的脉冲响应后与震源脉冲折积,求得了合成地震图,用此图得到了地震图初动半周期T_(2P)与震源尺度2a或震源脉冲宽度t_(2a)之间的关系量板.用此量板在时间域中也求得震源尺度2a,与频率域中求得的结果基本一致. 利用从断裂力学观点研究震源破裂过程导出的关系式求出了京津唐张地区的区域剪切...

作者从断裂力学观点研究了圆盘形纯剪切破裂产生的远场位移,导出了远场位移的解析表达式.用此表达式计算了远场位移脉冲波形及其谱.求得了P波和S波拐角频率F_(cα)、f_(cβ)与震源破裂半径的关系式,t_(2α)和t_(2β)分别是P波与S波的震源脉冲宽度在震源球上的平均值.V_r是破裂速度,取0.775β,α、β是P波与S波速度.介质吸收的影响,假定在略去路径滞后因子e-(iωr)/c后是最小相移滤波器,应用希尔伯特(Hilbert)变换导出了介质的频率响应公式式中,r为震源距,c为波速,Q为介质品质因数,ω_m为高频截止频率.它与富特曼(Futterman)公式是不一样的.在考虑了介质吸收影响与仪器频率特性影响后,在频率域中求出了震源尺度2a和地震矩M_0.在时间域中,利用快速傅立叶反变换求出介质和仪器的脉冲响应后与震源脉冲折积,求得了合成地震图,用此图得到了地震图初动半周期T_(2P)与震源尺度2a或震源脉冲宽度t_(2a)之间的关系量板.用此量板在时间域中也求得震源尺度2a,与频率域中求得的结果基本一致. 利用从断裂力学观点研究震源破裂过程导出的关系式求出了京津唐张地区的区域剪切应力τ_0,式中η为地震辐射效率,取0.05;v为泊松比,取0.252;μ为刚性模量,取3.3×10~(11)达因/厘米~2.结果表明,1976年7月28日唐山大震前,唐山—丰?

This paper describes the time-domain electromagnetic response above the surface of a homogeneous earth for the application of the impulse type airborne electromagnetic method. The formulations of the response are developed from the those of the frequence-domain by the Fourier transform. Both the horizontal and the vertical component of the secondary field were computed with the parameters of the home-made impulse type airborne electromagnetic system. According to the computer results of the time-domain, the...

This paper describes the time-domain electromagnetic response above the surface of a homogeneous earth for the application of the impulse type airborne electromagnetic method. The formulations of the response are developed from the those of the frequence-domain by the Fourier transform. Both the horizontal and the vertical component of the secondary field were computed with the parameters of the home-made impulse type airborne electromagnetic system. According to the computer results of the time-domain, the diagrames of interpretation are presented in this paper. It can be used to solve two major problems. The first is to interpret the time-domain airborne electromagnetic data measured at different flying altitude so that the earth resistivity will be provided. The second is to estimate the time-domain airborne E. M. response, if the earth resistivity is given; therefore the pseudo-anomalies caused by the change of the flying altitude will be corrected.

为了脉冲式航空电磁法的应用,本文介绍了均匀大地上空的时间域电磁响应。用傅里叶变换由频率域公式导出了时间域的响应公式。然后以国产脉冲式航电系统的参数计算了二次场的水平分量和垂直分量。根据时间域的计算结果,本文给出了一些解释的图件,可以用来解决两个主要问题。其一是解释在不同飞行高度测得的时间域航空电磁法资料,从而提供大地电阻率;其二是如果给出了大地电阻率,则可计算时间域的航空电磁响应,因此可以校正由飞行高度改变引起的假异常。

In this paper, the migration algorithm of the large dip wave equation in time-domain is given. The migration error caused by the dispersion is calculated. To mig-rate the synthetic and stacked seismic data with this algorithm proves effec-tive. Finally, some field examples in complex fault block region are presented.

本文给出了在时间域中的大倾角波动方程偏移算法。计算了波散引起的偏移误差。用这个算法偏移合成和叠加地震资料,取得了好的效果。最后还给出了复杂断块地区野外地震资料偏移的例子。

 
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