The SIMUL simulation language is introduced and its application to the simulation of continuous-time systems controlled by digital computers is described. Then, one considers the control of the primary coolant temperature in a PWR nuclear power plant: Large disturbances induce unacceptable...

Two numerical hydrodynamic models of wind-driven water circulation in a basin are considered.

In an earlier paper, we developed a convergence theory for a class of multigrid methods applied to differential boundary value problems, where the differential operator is self-adjoint and positive definite. The multigrid structure assumed a variational setting (although it applies to finite...

Four mathematical models were evaluated for their ability to describe the fate of nitrogen (N) in the soil environment. The first model is a general one which accounts for convective-dispersive N transport under transient water flow conditions with active N uptake by plants. Model II considers N...

Dynamic systems that at the same time exhibit slow as well as rapidly oscillating transients are difficult to simulate numerically. In this paper the Ai-stability (a sub-division of A-stability) is defined and then a simple A2, general purpose method is presented which eases the above mentioned...

In this study the planning process is applied to a conflict resolution problem by structuring a well known conflict (the Northern Ireland problem) using the levels of a conceptual hierarchy. The parties to the conflict form the first level, the objectives of these parties form the second level,...

A new approach for the efficient numerical solution of Singular Perturbation (SP) second order boundary-value problems based on Gradient-type methods is introduced. Isomorphic implicit iterative schemes in conjuction with the Extended to the Limit sparse factorization procedures [9] are used for...

This paper is concerned with methods of designing nonlinear state observers for polynomic systems, which can be modeled by state equations with linear, bilinear, and quadratic terms. The general structure of polynomic observers is introduced and simulation serves as a useful tool to determine...

The second order leapfrog method is used to discretize the linearized KdV equation which is itself a dispersive partial differential equation. The resulting difference equation is solved and analyzed in terms of its dispersion relation and propagation properties. Numerical experiments are...

A Monte Carlo Method for solving linear and integral equations based on simulating one realization of an ergodic Markov chain is proposed. The efficiency of the proposed method is discussed.