Professor John Gregg

Abstract:

An integrated contactless radiofrequency sensor using MESFET circuitry with a miniature resonator is capable of sensing homogenous and heterogeneous liquids. Examples include detection of liquid drop size and velocity, and sensing of heterogeneous mixtures such as slurries or oil and water, …

Abstract:

A miniature, monolithic radiofrequency sensor operating with MESFET circuitry in the GHz range is able to detect a wide variety of magnetic, metallic and dielectric materials via the losses induced in the sensitive volume around a coil. Application of the sensor to detect plastic and metal gearwheels and falling liquid drops is illustrated; the signal-to-noise ratio falls off as the inverse distance from the coil to the liquid drop. (C) 2001 Elsevier Science B.V. All rights reserved.

Abstract:

A spin transistor (10) comprises a spin injector (50) formed of a ferromagnetic material and constituting the emitter (20) of a three-terminal device, a spin filter (70) also formed of a ferromagnetic material and constituting a collector (40), and a semiconductor base (30) region. A tunnelling …