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The paper simply introduced the basic principle of surface nuclear magnetic resonance and computed the numerical integral of nuclear magnetic resonance kernel function which contained double Bessel functions using the method of Gauss quadrature and continued fraction expansion, and then discussed influence of conductivity to nuclear magnetic resonance′s signal.

简要介绍了地面核磁共振找水的正演理论方法,采用高斯求积并结合连分式展开的方法对核磁共振核函数中包含双重贝塞尔函数的积分核进行了数值积分,进而计算出精度较高的核函数值,在此基础之上,讨论了导电性对地面核磁共振信号的影响。

E. the discrete scheme of FBEM and the inner damping method of continuity equation, the author made numerical analysis of viscous flow field in cascade and cascade experiment in the experimental wind tunnel of Section 204 of Harbin Institute of Technology. The calculated results are in agreement with the experimental ones.

为进一步验证本文提出的有限边界元素法离散格式和连续方程的内部阻尼法的可行性,作者对叶栅内的粘性流场进行了数值分析,并与在哈尔滨工业大学204教研室的实验风洞上进行的叶栅实验结果进行了比较。

Based on the summation of numerical solutions of the free water surface seepage flow, a new concept called Regional Identification Function is put forward. It is pointed out that the reason why the initial flow method is unstable is that the RIF is discontinuous. Linearization continuity method for the RIF is suggested and then a revised initial flow method is presented.

在总结现有自由面渗流求解方法的基础上,提出了区域识别函数的新概念,指出区域识别函数不连续是导致初流量法解不稳定的主要原因,并对此函数进行了线性微调,提出了改进初流量法。

Applying the Euler method to the equation and particularly using the interpolation technique on variable delay, the Euler approximation is obtained. The discrete Euler approximation is extended to the continuous Euler approximation. It is proved that the Euler numerical solutions will converge strongly to the true solution under the local Lipschitz condition.

对方程应用欧拉方法,特别地对变延迟部分运用插值技巧进行数值离散后,将离散的欧拉格式延拓为连续的欧拉格式,从而得到欧拉格式在局部Lipschitz条件下强收敛到解析解。

Based on the geometric nonlinear and material nonlinear of structure, the three dimension stability analysis of long span curve continuous rigid frame is performed on the base of the numerical analysis, and comparison of the linear and the non-linear is also done.

本文分别考虑结构的几何非线性和材料非线性力学特征,对高墩大跨弯连续刚构桥梁的结构稳定性进行详细的数值分析,并与线弹性的计算结果进行对比。

A numerical simulation to the whole motion differential equation is finished, and a continuous angular displacement curve of micro reflectmirror is obtained.

通过对该模型的完整机电动力学微分方程数值求解所作的运动仿真,得到了微镜基板的连续角位移曲线,表明该装置具有良好的光束稳定特性

Therefore,the numerical algorithm of normal distribution function in continuous space is improved,so that the difficulty of the discretization of question difficulty and the difficul...

本文对连续的正态分布函数计算方法进行了改进,解决了试题难度的离散化和试题数量为整型值造成的试题难度正态分分配困难问题。

Making use of the program developed in this paper and its numerical results are able to simulate fluid flow and temperature distribution in slab continuous casting.

本文还研究了板坯结晶器温度场和凝固壳厚度分布的各种影响因素,探讨了数值计算方法对流场和温度场计算结果的影响。

By using the theories and methods of impulsive,discrete and continuous dynamical system,arithmetic operators,optimiza-tion and numerical simulation,we study locally and globally asymptotieal stability of the boundary periodic solutions,and the permanence of the these systems.

以脉冲动力系统理论为基础,同时结合离散动力系统、连续动力系统、算子理论、优化理论等相关的理论和方法,在已有的研究成果的基础上,研究这些模型的边界周期解的局部和全局渐进稳定性、系统的持续生存、周期解的存在性与唯一性以及周期解的轨道稳定性等等。

Numerical simulation of high energy continuous wave DF/HF chemical laser.

华为红。高功率连续波DF/HF化学激光器数值模拟研究。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力