The automatic solution of variable-coefficient and nonlinear differential equation systems on The Matric Computor engenders the concept of equisolution matric systems which are defined as comprising constant, differential, and linear functional coefficients in their construction. First of all,...

The paper deals with the application of the hybrid method of decomposition for the solution of two-dimensional parabolic partial differential equations with constant coefficients. The convergence and accuracy of the CSDT method are analysed, deriving the form of the relationship between...

Les auteurs proposent, daps cet article, une méthode d'étude numérique qui, tout en conservant la représentation des champs par des équations aux différences finies, permet de réduire considérablement le travail nécessaire à la détermination de ces champs et rend possible la solution...

Les auteurs précisent comment un calculateur à réseau de résistances à 3 dimensions permet de déterminer les états et les énergies électroniques dans un solide. On utilise la méthode dite cellulaire, le réseau résolvant l'équation de Schröndiaer; ce réseau comporte des...

On décrit un montage permettant d'obtenir la valeur algébrique instantanée de la dérivée d'un signal électrique très lentement variable (composantes spectrales comprises entre 1.10−2 Hz et 1 Hz) et fournissant des tops de repérage lors du passage du signal par un extrémum.

The motion of a pendulum can be represented in a phase plane where the time derivative of the angle is put vertically and the angle of the pendulum itself horizontally. Such a phase plane has identical vertical strips which is 2π width. One strip can be drawn on a cylindrical phase surface...

In diesem Fallen hängen die Koeffizienten der gegebenen Funktionen F und ψ von zeiabhängingen Parametern ab. Dieselbe Methode wird hier benutzt (siehe ersten Teil), Ein Beispiel wird nach dieser Methode behandelt.

A multiplier, which is to form one of the units of a small transistorized analogue computer, is described. The multiplier is of the time division type proposed by Goldberg. Its main parts are, an integrator, switching circuits and a filter amplifier. The design specifications of these elements...

Simulation of physical systems often requires repetitive evaluation of functions such as sine, cosine, exponential etc. The arguments of these functions are physical quantities, which usually change very little from one computation cycle to the next. An approach to function evaluation is...

In the previous papers[1]–[3], nonlinear continuous functions could be well simulated by nonlinear resistance. Its mathematical basis came from the applicability of the fractional power approximation. From a view of using transistor-junction characteristics, the use of exponential functions...