This paper describes the construction of an instrument for measuring the impedance using a physical model. The model has to be adjusted in such a way that its differential equation corresponds with that of the unknown impedance.

A method is described for constructing metabolic models composed of many nonlinear stiff differential equations. The system being modeled is divided into subunits (where such division is impractical, forcing functions are used), and algebraic relationships for their behavior at an instant in...

Hydrologic systems, like most environmental systems, are usually characterized by partial differential equations. In order to develop a suitable mathematical model for the analysis of such systems, it is first necessary to make use of observed data in order to identify or estimate the system...

Runge-Kutta formulas are given which are suited to the tasks arising in simulation. They are methods permitting interpolation which use overlap into the succeeding step to reduce the cost of a step and its error estimate.

The problem of determining optimum temperature profiles for tubular reactors is solved by the calculus of variations in its classical form. This leads to a two-point boundary value problem, which may be solved, in the simpler cases on an ususal analog computer and in more complex cases...

An analysis of errors in Parallel Multiple Incremental Computer is done with specific reference to the influence of register's length. Improved polygon methods, 2nd order Adams and 4th order Runge-Kutta formulas have been considered; statistical analysis of both round-off and truncation errors is...

The article concerns the use of an alternating analogue analyser for the study of power changes in an electrical transmission network. The usual technique consists of representing the sources and loads by means of voltage generators in phase and in quadrature.

The introduction of modern heavy jets poses an increasing hasard to light and moderate weight aircraft due to high-intensity vortex wake turbulence. A technique is developed to simulate the response of a trailing airoraft due to the induced rolling moments and lose of lift imposed by the...

Given a two-variable continuous function in some domain of some input space, it is always possible to achieve a lattice polynomial that represent a piecewise linear approximation of the function.

This paper describes a detailed analogue computer simulation of an asynchronized synchronous machine, which is suitable for investigating both steady-state and transient performance. A simple method is presented for simulating asynchronous operating conditions, and developed to provide the...