The paper reviews and develops an accurate equivalent circuit of a junction transistor which is valid over a wide band of frequencies; the parameters of the circuit themselves emphasizing the physical mechanisms of the device. It is then shown that the equations governing the equivalent may be...

It is shown that the determination of the electromagnetic forces in transformer windings axial symmetry can be effected by means of a two-dimensional resistance network, with currents injected at a number of nodes. The network components are evaluated, and some comparison is given between the...

The paper gives the description of a circuit for the simulation of self-inductances. After a discussion of several parameters influencing the quality-factor Q of the simulated self-inductance, it is shown that the circuit is also able, owing to a function generator, to simulate a non-linear...

The use of a pulse ratio modulator for digital to analogue conversion, hybrid multiplication, analogue to digital conversion, hybrid division and voltage to pulse frequency conversion is described. Digital to analogue conversion is accomplished by summing the voltages from the digits of a...

On the basis of nuclear reactor simulation, this paper shows that problems, where large variations of certain variables are expected, may be easily implemented on general purpose analog computers without any digital or hybrid extensions. Particular attention is given to the problem of automatic...

La connaissance de l'intégrale de Dirichlet est utile dans de nombreux problèmes, dont la perturbation induite par des cavités dans un réacteur nucléaire.

A simple method is described by which a diode function generator can be suited for two input variables. A function z = f (x, y) is then generated. Extension to functions like w = f (x, y, z), and son on, is possible with little extra requirement for equipment.

Mathematical description of flow in underground reservoirs gives rise to partial differential equations that are often non-linear and that contain parameters which are position dependent. The solutions of these equations provide useful information for the evaluation and prediction of reservoir...