查询词典 kirchhoff

Directly from the theory of Kirchhoff diffraction, without any approximation about mathematical models, a series of improved digital calculation ways are used to ensure the high accuracy of OTF calculation.

直接从基尔霍夫衍射积分理论出发，在数学模型上考虑了瞳面振幅分布的不均匀性和倾斜因子，并采取一系列改进数值计算方法的措施，力求光学传递函数计算的高精度。

In the last a few years, the differential solution of wave equation was hold up by the condition of computation. Kirchhoff integral method rose in the initial stages of the ninetieth decade of last century.

前几年波动方程微分解由于受计算条件的限制而难于在地震资料处理过程中发挥作用，上世纪90年代初发展起来的克希霍夫积分方法，因本身存在的缺陷也难于在深层地震资料处理中取得新的突破。

In order to accurately simulate the mechanical behavior of sheet metal, normal anisotropy and anisotropy constitutive equations were derived by the author based on Kirchhoff hypothesis and Hill's yield function.

为了准确模拟板料的力学行为，作者根据Kirchhooff假设和Hill各向异性屈服条件，分别导出了厚向异性和各向异性金属材料的弹塑性本构关系。

Based on the particularity of receiving and observing system in 3-D VSP surface shot hole and by use of reciprocity theorem of seismic wave field,a method of carrying out wave equation migration is proposed for 3D VSP .

常规的三维VSP地震数据偏移成像大都使用基于射线理论的Kirchhoff积分方法在共炮点道集中进行，因此对地下速度横向变化大的复杂构造区适应性差、效率很低。

In order to overcome this problem, in this paper, the surface electric current of the conducting sea surface and the first-order scattering from the conducting plate are obtained by employing Physic Optics method. The backscattering field of the time-dependant sea surface is calculated by using Kirchhoff Approximation. Meanwhile, taking the advantage of a newly developed technique that utilizes the reciprocity theorem, the difficulty in formulating the secondary scattered fields from the composite target is reduced. The dependences of the backscattered field on the parameters, such as the wind speed and the sizes of the plate are discussed.

为了克服这一问题，本文应用物理光学近似求解了导体海面表面电流及导体平板的一阶散射场，应用基尔霍夫近似给出了海面的后向散射场，同时借助互易性定理降低了求解平板和海面之间二次耦合散射场的难度，讨论了平板尺寸、风速等对后向复合散射场的影响。

Using the characteristic of the regular curve boundary for a bending plate in engineering,the analytic integral formulae of assistant states in boundary element method with the linear element for a Kirchhoff circular plate are introduced and the systematic equation of BEM is established in this paper.

利用一般弯曲薄板边界为规则曲线的特点，对工程常用的圆形弯曲薄板，采用线性单元，导出K irchhoff圆板各辅助态的边界积分解析表达式，建立问题的边界元法系统方程，从而使薄板的边界元分析完全避免通常使用的高斯积分，明显提高计算精度。

We discussed the prestack depth migration techniques and processing flow of ST seis software system and presented the results of 3-D prestack depth migration on the real seismic data from BS6 area.

介绍了基于ST seis系统的Kirchhoff积分法叠前深度偏移的基本原理及处理流程，给出了应用该系统对胜利油田BS6地区三维地震资料叠前深度偏移处理的效果。

Then,shotpoint-receiver pairs which meet reflec-tion law are found by using Snell's law. Finally,prestack depth imaging is achievedby using constraint weighted Kirchhoff integral. This method is adaptable to thevertical and lateral variation...

本方法适应速度的纵向和横向变化，它优于简单的VSP－CDP资料转换成像方法，通过模型和实际资料的成像应用表明，此法不仅成像精度高，而且有利于改善剖面的频率特性。

Further, strain energy function is separated into volumetric and deviatoric parts, and the relationship between the Green-Lagrange strain tensor and second Piola-Kirchhoff stress tensor is given.

在建立求解方程的过程中，Heaviside加权函数的引入完全或部分除去了刚度矩阵中的局部域积分项，大大简化了本文方法的计算工作量。

Electromagnetic field theory,lumped-element circuit theoy and distributed circuit theory,based on maxwell′s equations,kirchhoff's laws,telegrapher's equation respectively,are the main methods to analyze electromagnetic problems.

0引言电磁场问题的"场"理论是基于Maxwell方程组的理论分析途径，这种分析方法归结为电磁场边值问题地求解，通常比较复杂而繁琐，原则上可以用来处理几乎所有得宏观电磁场问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。