Ministry of Supply

About: Ministry of Supply is a based out in . It is known for research contribution in the topics: Polarography & Bacillus (shape). The organization has 416 authors who have published 355 publications receiving 8951 citations. The organization is also known as: MoS.

The Theory of the Super-Regenerative Receiver Operated in the Linear Mode

Abstract: A general theory is developed of the super-regenerative receiver in the linear, as distinct from the logarithmic, mode. Two states of operation are distinguished, corresponding roughly to sinusoidal and rectangular wavequench. Formulae are derived for the properties of the receiver in both states when receiving a signal much greater than noise. The theory of the slope-controlled state predicts that the frequency response and the envelope of the output oscillations of such a receiver will each have the shape of a Gaussian error curve. This is amply confirmed by experiment. A theory of noise in the super-regenerative receiver is given according to which the whole of the noise energy collected by the r.f. acceptance band of the receiver goes to produce noise in a bandwidth equal to half the quench frequency in the receiver output. The effect of further decreasing the post-detector bandwidth is also dealt with, and the origin of noise in the super-regenerative receiver itself is briefly discussed. Considerable attention is given to the output spectrum due to signal and noise as an aid to understanding the operation of the receiver.

A Discussion on Detonation

Abstract: The fundamental physical, chemical and mechanical processes which occur when a detonation wave passes through an explosive were imperfectly understood at the beginning of the recent war. As part of the scientific war effort in the British Common-wealth and in the United States of America, many theoretical and experimental studies were made of detonation processes. Much of the work has recently been declassified and some has been published. Several centres of research in this country and elsewhere are vigorously continuing with these studies. As later papers will show, the quality and general scientific interest of much of this work was considered sufficient to form the basis of a Discussion of the Royal Society. If one neglects the finite width of the zone in the detonation front where chemical reactions occur, a freely running steady plane detonation front can only advance through an explosive with the Chapman-Jouguet velocity defined by D = u + c . Once the explosive products are formed, their subsequent chemical reactions and motion in the detonation front may be considered as adiabatic. Although Chapman (1899) and Jouguet (1901) correctly stated their equation, neither attempted to discuss the reaction zone itself. It was therefore thought necessary that the recent views on the reaction zone should be described in a manner which throws new light on the Chapman-Jouguet equation. Professor J. von Neumann, Dr⋅ S. F. Boys and Dr A. F. Devonshire were the principal contributors on the theoretical side and von Neumann’s theory (1942) will be outlined later.