The U.S. Department of Agriculture, Agricultural Research Service initiated a national project to develop a hierarchy of systems for evaluating nonpoint source pollution to meet the planning needs of PL 92-500, Section 208. In 1978, approximately 45 scientists and engineers concentrated their...

A class of distributed-parameter control systems involving interacting fast and slow subsystems is considered and treated by an extension of the singular perturbation method well known in the field of lumped-parameter large scale systems theory. In particular, the method is applied to a power...

In this paper the problem of the optimal management of an electrical power system is discussed. The production of hydroelectric energy is associated to that produced by steam plants in order to provide for a given load diagram. An economic dispatching is carried out, also taking into account the...

Usually the implementation of any control system on a real process needs preliminary tests performed during a simulation stage, the aim of which is to check out the control algorithm before applying it on the process. In this paper the authors develop a general hybrid procedure which is actually...

The need exists for methods to simplify groundwater contaminant transport models. Reduced-order models are needed in risk assessments for licensing and regulating long-term nuclear waste repositories. Such models will be used in Monte Carlo simulations to generate probabilities of nuclear waste...

Network Thermodynamics is a formalism which uses the concepts of network theory to solve problems generated by thermodynamic and/or kinetic descriptions of systems (generally by simulation, for complex, highly organized, dynamic systems). It is particularly useful in Biology due to the...

In a recent paper (McKee, 1975) the Hopscotch method was applied to solve the fourth-order parabolic (beam) equation. Several computational schemes were discussed which prove to be conditionally stable with the stability range no better than that of the usual explicit scheme.

A new technique for the identification of general bilinear systems is presented. The model reference adaptive systems (MARS) technique together with the direct method of Liapunov are used to construct the identifier for the system parameters. The plant is assumed to be multivariable, continuous...

The need for complex models in biology, and reasons such as esthetics and tradition for resistance to their use, are discussed. Examples considered are an existing cardiac metabolism model, and a possible comprehensive and complex diabetes model, with their associated problems. Characteristic...