https://reports.aerade.cranfield.ac.uk/handle/1826.2/4516 Wed, 12 Aug 2026 23:50:26 GMT 2026-08-12T23:50:26Z https://reports.aerade.cranfield.ac.uk/handle/1826.2/4521 Wideband measurement of transistor small signal parameters by time domain spectrometry Time Domain Spectrometry (TDS) Methods are outlined and their application to measurement of transistor parameters is discussed. Experimental results are presented and the advantages and limitations of TDS methods are re-assessed. Future developments are suggested. https://reports.aerade.cranfield.ac.uk/handle/1826.2/4521 https://reports.aerade.cranfield.ac.uk/handle/1826.2/4517 The realization of fourth-order rational transfer functions with adjustable coefficients Design techniques are described for the simulation of third-order and fourth-order rational transfer functions with adjustable coefficients. The realization procedure, which is based on the use of an ideal computing amplifier associated with linear passive R.C. two-port networks, is an extension of the methods described previously(1,2) for quadratic functions. https://reports.aerade.cranfield.ac.uk/handle/1826.2/4517 https://reports.aerade.cranfield.ac.uk/handle/1826.2/4518 Proposals for a basic theory of air traffic control This note serves as an introduction to the work on Air Traffic Control currently being carried out at The College of Aeronautics. The basic principles of Air Traffic Control are examined and a mathematical basis for an analysis of the current and future ATC complex is discussed. The theory is based upon feedback control concepts using intermittent data. Examples showing the application to en-route airway and parallel track flying are given. These demonstrate the effect of positional data up-dating rate upon separation minima for both subsonic and supersonic aircraft. Application to both fixed route (Airway Control) and free-route (Area Control) are currently being considered. A full report is to be published at a later date. https://reports.aerade.cranfield.ac.uk/handle/1826.2/4518 https://reports.aerade.cranfield.ac.uk/handle/1826.2/4519 Superconductivity - some aspects of the theories and possible applications Superconductivity is an effect exhibited by certain materials at very low temperatures in which normal electrical resistivity disappears completely. Summaries of the current theories which attempt to account for this phenomena are presented, and, various proposals for making use of this effect in practical devices are examined and discussed. Proposals for a programme of research in the application of superconductivity to rotating electrical machines are outlined. https://reports.aerade.cranfield.ac.uk/handle/1826.2/4519