查询词典 numerical constant

Numerical results also show that the inverse problem with Cauchy data is better to formulate by the singular integral equation than by the hypersingular integral equation for the constant element scheme.

由数值的经验，我们也发现对於柯西资料反算问题，在使用常元素时，最好采用奇异积分方程式会有比较准确的结果。

Solar constant ; surface temperature ; numerical experiment ; global warming

太阳常数；地表温度；数值实验；全球增暖

According to rate process theory, slip theory of plasticity and principle of virtual work, the micromechanical model of soil creep are set up, the numerical solution of the model is given, the differences and similarilities between frequency distribution function of microplane and clay platelet are discussed and schematic computation flow of the model for fitting the test data of homogeneously stressed anisotropically consoildated clay specimens in an undrained creep test at constant volume are given.

以速率过程理论作为土质学与土力学间的桥梁，根据塑性滑动理论和虚功原理，从微观结构的角度，建立了反映粘性土宏观应力应变关系的微观力学模型，给出了微观力学模型数值解的近似表达式，讨论了微滑面与粘粒和团粒定向频率分布的异同，设计了一个拟合各向异性土不排水蠕变的计算流程。

The real-world joints in the aircraft structure usually consist of multi-row fasteners. This thesis builds the 3D FE contact analysis model of a typical aircraft joint with three-row countersunk screws, and studies pin-load distribution and stress characteristics under constant and varied cross-section thicknesses as well as with and without pre-tighten screw conditions for the joint. Many applied pin-load numerical distribution laws for different conditions in the joint are recognized.

本文对典型的多排沉头螺钉接头建立了三维有限元接触分析模型，对螺钉的钉载分布在截面等厚度和变厚度、无预紧力和加预紧力多种情况下进行了数值计算分析，给出了诸多实用化钉载分布规律。

Numerical simulation of electroosmotic flows in a straight channel and a constant radius turn were carried out.

最后，文章综合分析了引起弯道效应的诸多因素，对几种消除弯道效应的方法进行了比较。

According to by the time series estimate power spectral density\'s periodogram law principle,the research adopts five level of orbital power spectra which US Federal railway Administrative bureau FRA proposed;then,through the Fourier inverse transformation,the orbital not smooth time domain samples are obtained, which determine the track irregularity peak-to-peak value and the corresponding wave length; on the basis of the research,the influence of the wheel track dynamic contact force are considered.Based on the orbital roadbed coefficient\'s definition,computation model is established to solve the roadbed equispaced spring constant,and the roadbed uniform spring stiffness is obtained by using the numerical simulation method.Finally,based on the Matlab procedure platform,the computational procedure is established,and the load time interval caused by the moving train acts on the roadbed is obtained.

根据由时间序列估计功率谱密度的周期图法原理，采用美国联邦铁路管理局FRA提出的五级轨道功率谱，通过Fourier逆变换得到轨道不平顺的时域样本，确定了轨道不平顺的幅值及对应的波长，以此为基础考虑轮轨动态接触力的影响；基于轨道路基系数的定义建立了求解路基均布弹簧刚度的计算模型，采用数值模拟得到了路基均布弹簧刚度；最后，基于Matlab程序平台编制了计算程序，得到了运行列车作用到路基上的荷载时程。

Model, then calculated the tidal consistent constant and saved as map layer as the data for tidal fast prediction. The result of comparing the model result and investigative data indicated its rationality.Later applied the model in the numerical predication of sinkable chemicals spilled beside ZhuHai region.

分析近海水域环境污染扩散数值模拟的研究应用现状基础上，根据沉降型化学品的性质及其在海上的行为特点，分别建立沉降型化学品行为数值模拟的对流扩散方程模式和粒子拉格郎日迁移模式，确定求解方式并将其软件化。

Therefore, the hybrid method was adopted to determine the equivalent material properties. In this paper, the modal testing and numerical analysis were applied to obtain the Frequency Response Function and to calculate the equivalent spring constant and damping ratio of the suspension.

因此本文针对汽车悬吊部分，先以模态试验法与数值分析方法，将悬吊部分以线性弹簧及阻尼来模拟，并使用混合法，结合实验与数值之结果进行参数调整，在此是以FRF Base 来实施参数调整，确立悬吊系统的等效弹簧系数与阻尼系数。

It is expected that the ceramic candle filter has an extensively application. A one-dimensional constant filtration flow model is established. Based on this model, the numerical calculation for the candle filter whose section is cylindrical and conical is carried out.

在高温高压条件下清除含尘气体中的微细尘粒，有效的方法是使用陶瓷过滤器，陶瓷过滤器是最具发展潜力的气固分离装置，除尘效率高达99.9 %，在高温气体净化领域有着广阔的应用前景。

In this paper, the analytical solutions of reservoir pressure in Laplace space are developed for planar linear flow and radial flow under the condition of constant pressure at inner and outer boundaries, and the pressure distribution curves in some point in the reservoir are obtained using Stehfest numerical inversion algorithm of Laplace transforms.

本文在内、外边界定压的条件下得到了平面单向流和平面径向流两种渗流形式在拉氏空间的解析解，利用Ste hfest数值反演方法给出了地层各点的压力分布曲线，由这些曲线可以清楚地看到流体的流动由不稳态流向稳态流过渡以及最后达到稳态流的过程。

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。