This paper presents an approach using the method of separation of variables applied to 2D Helmholtz equations in the Cartesian coordinate. The solution is then computed by a series solutions resulted from solving a sequence of 1D problems, in which the 1D solutions are computed using pollution free difference schemes. Moreover, non-polluted numerical integration formulae are constructed to hand...

A linear method is developed for solving the nonlinear differential equations of a lumped-parameter thermal model of a spacecraft moving in a closed orbit. This method, based on perturbation theory, is compared with heuristic linearizations of the same equations. The essential feature of the linear approach is that it provides a decomposition in thermal modes, like the decomposition of mechanic...

We propose in this paper a space-time adaptive algorithm based on the Dual Weighted Residual (DWR) idea in the framework of finite element method. Our algorithm consists of applying the DWR technique locally in each time interval In := (tn−1, tn], thus, we control the local or truncation error for a functional of the solution J(u). That means that we can define a self-sufficient criterium that ...

Triangular B-splines are a new tool for modeling a broad class of objects defined over arbitrary, nonrectangular domains. They provide an elegant and unified representation scheme for all piecewise continuous polynomial surfaces over planar triangulations. To enhance the power of this model, we propose triangular NURBS, the rational generalization of triangular B-splines, with weights as additi...

abstract wenner direct contact method is a method of estimating apparent electrical conductivity (eca) of agricultural soils in situ. this method can be affected by factors such as quality of electrodes in contact with soil, type of employed electric current, moisture content, clay content and compaction of soil. in this research, the effect of electrode type (rod and plate) and electric curren...

We present a one-way dissection formulation of high-order compact scheme for the solution of 2D Poisson equation. One-way dissection is a type of matrix reordering, divide and conquers procedure. Efficient and concise compact schemes of 4th and 6th orders are derived using the truncation errors of the Taylors’ series expansion of the governing equation. The system is split into sub-domains and ...

In addressing the issue of value derived from Web-enabled direct procurement, this study attempts to investigate the impact of Web-based direct procurement systems on intraand inter-organizational process integration capabilities and organizational performance. A sample of 131 manufacturing firms with experience participating in government-subsidized e-business development projects is surveyed,...

Runtime testing is emerging as the solution for the integration and assessment of highly dynamic, high availability software systems where traditional development-time integration testing is too costly, or cannot be performed. However, in many situations, an extra cost will have to be invested in implementing appropriate measures to enable runtime tests to be performed without affecting the run...

Introduction: Pervasive beliefs regarding curricular reformand integration have flourished among medical students, facultymembers and medical school administrators. These conceptshave extensively impacted the reform process, sometimes byresisting the reforms and sometimes by diverting the curriculumfrom its planned objectives. In the current paper, we have tried toaddress the challenges of inte...