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root equation
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  “root equation”译为未确定词的双语例句
     Double square root equation migration methods of narrow azimuth seismic data
     窄方位地震数据双平方根方程偏移方法探讨
短句来源
     By Fourier transform, scalar wave equation, can be transformed into single square root equation, which is a basic equation for post-stack migration.
     从标量波动方程出发,利用傅里叶变换,可导出单均方根方程(single radical equation),它是叠后偏移的基础方程。
短句来源
     The program use The FORTRAN77 language slover the root equation of a degree and equation of two degree,It is succeed that input string of equation, output the root equation.
     FORTRAN77编制的求一元一次方程和一元二次方程的根,实现了输入方程字符串,输出方程的根。
短句来源
     The program use The FORTRAN77 language Slover the root equation of a degree and equation of two degree
     FORTRAN77编制的求一元一次方程和一元二次方程的根
短句来源
     Once upon,slover the root equation of a degree and equation of two degree that need input coefficient of equation,data separate need comma or space,output the root equation.
     从前求一元一次方程和一元二次方程的根,要求输入方程的系数,数据间逗号或空格分隔,输出方程的根。
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  相似匹配句对
     equation
     方程(之14)
短句来源
     Root
     根
短句来源
     For the equation
     我们称方程(?)
短句来源
     Operation of root of Algebra Equation
     代数方程根的运算
短句来源
     The Distribution of the Root of the Simple Cubic Equation
     一元三次方程根的分布
短句来源
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  root equation
An empirical approach to the concentration-time history of a dissolving drug has resulted in a cube-root equation in which the characteristic constant of the equation embodies the important physical variables of the system.
      


By Fourier transform, scalar wave equation, can be transformed into single square root equation, which is a basic equation for post-stack migration. The radical expression in the equation may be approximated in different ways; consequently, there are different migration methods. The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction. In practice, this equation is solved by split- ting...

By Fourier transform, scalar wave equation, can be transformed into single square root equation, which is a basic equation for post-stack migration. The radical expression in the equation may be approximated in different ways; consequently, there are different migration methods. The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction. In practice, this equation is solved by split- ting into two ones (called thin lens and diffraction term equations), which are solved alternately. Crank-Nicolson scheme is used in secondorder difference so that both the high accuracy and the stability of wave field extrapolation can be ensured. Furthermore, "one sixth knack" of approximation is taken for higher accuracy. In summary, this migration process is composed of the following steps: first, by Fourier transform, a seismic section is transformed from time domain to frequency domain; then, for each frequency, the wave field is extrapolated from known depth Z to unknown depth Z+△Z by making use of the thin lens term equation and the diffraction term equation; finally, the component extrapolated results for all frequencies are summed up to form a resultant migration result at depth Z+△Z. summation process is also migration image process. Two theoretical models illustrated in the paper all bring good migration result.

从标量波动方程出发,利用傅里叶变换,可导出单均方根方程(single radical equation),它是叠后偏移的基础方程。此方程中的根式可采用不同的近似方法,因而有不同的偏移方法。采用连分式近似,可以得到空间频率域的有限差分深度偏移方程。在具体实现时应用分裂算法,即分裂成薄透镜项及绕射项,然后进行差分运算。对于二阶差分,采用了Crank-Nicolson差分格式,这不仅保证较高的计算精度,而且保证在波场外推过程中的稳定性。为了得到更高的计算精度,还采用了一种叫做1/6的近似技巧。上述的这种偏移方法过程可以归结为:首先对地震剖面作傅里叶变换,由时间域转换到频率域,然后对每一固定频率,利用薄透镜项和绕射项偏移方程进行外推,即把已知深度Z的波场外推到未知深度Z+ΔZ的波场,最后把Z+ΔZ处所有频率成分外推的结果累加求和,得到最终的偏移结果。累加的过程,即是偏移成像的过程。文中给出两个理论模型的例子,都能得到较好的偏移结果。

The wavefield transform DART is discussed, which transforms the prestack wavefield satisfying the double square-root equation to that satisfying the single square-root equation. The latter can be properly processed by conventional normal-moveout and common-midpoint stacking. The transform presented in this paper removes the dip-affection and is indeed a method of DMO. This transform, like the Stolt method in migration, can be easily performed by FFT and supplemented interpolation.

本文讨论波场的一种转换,称为消除倾角影响变换(DART),它将满足双平方根算子方程的叠前波场转换成满足单平方根算子方程的波场.后者可以进行常规的动校正和水平叠加.事实上这种转换是消除动校正时倾角影响的一种倾角校正(DMO)方法.这是Stolt偏移法在DMO中的类似,它只需利用快速傅氏变换(FFT)以及附加的插值运算就可实现.文末附有算例.

OBJECTIVE: To study the release kinetics and release mechanisms of ethylcellulose solid dispersion granules and tablets METHODS: The dissolution curves of nicrandil ethylcellulose solid dispersion granules and tablets were measured The release data were fitted with three model equations The release kinetics and release mechanisms of granules and tablets were judged by the sequence of correlation coefficients of three fitting equatuions RESULTS: The sequence of fitness (from good to bad) of granules...

OBJECTIVE: To study the release kinetics and release mechanisms of ethylcellulose solid dispersion granules and tablets METHODS: The dissolution curves of nicrandil ethylcellulose solid dispersion granules and tablets were measured The release data were fitted with three model equations The release kinetics and release mechanisms of granules and tablets were judged by the sequence of correlation coefficients of three fitting equatuions RESULTS: The sequence of fitness (from good to bad) of granules dissolution model was: zero order model, Higuchi model, first order model The sequence of fitness (from good to bad) of tablets disslution model was: Higuchi model, first order model, zero order model CONCLUSION: The drug release of granules was surface diffusion mechanism, following zero order release kinetics The drug release of tablets was matrix diffusion mechanism, following Highchi square root equation

目的 :研究乙基纤维素固体分散物颗粒及片剂的释放动力学及释放机制。方法 :测定尼可地尔 乙基纤维素固体分散物颗粒及片剂的释放曲线 ,并用 3种模型方程———零级动力学方程、一级动力学方程、Higuchi模型方程进行线性拟合 ,根据所得方程的相关系数的大小顺序 ,确定颗粒及片剂的释放动力学及释放机制。结果 :颗粒释放动力学拟合顺序为 :零级动力学模型、Higuchi模型、一级动力学模型 ;片剂释放动力学拟合结果的优劣顺序为 :Higuchi模型、一级动力学模型、零级动力学模型。结论 :颗粒释放遵从零级动力学模型方程 ,为表面扩散机制 ;片剂释放遵从Higuchi方程 ,为骨架扩散机制。

 
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