Foam fraction can be retrieved from space-based microwave radiometric data at frequencies from 1 to 37 GHz. The retrievals require modeling of ocean surface emissivity fully covered with sea foam. To model foam emissivity well, knowledge of foam properties, both mechanical and dielectric, is necessary because these control the radiative processes in foam. We present a physical description of fo...

Database access can be seen as a series of communicating systems each contributing to the overall efficiency of the query. This paper investigates the effect that impedance mismatch has on speech database access: the efficiency of database transactions between the corpus and the querying application(s). A system where impedance mismatch has been reduced through an object-oriented paradigm is pr...

The acoustic impedance at the diaphragm of an electroacoustic transducer can be varied using a range of basic electrical control strategies, amongst which are electrical shunt circuits. These passive shunt techniques are compared to active acoustic feedback techniques for controlling the acoustic impedance of an electroacoustic transducer. The formulation of feedback-based acoustic impedance co...

Given a collection {Z1, Z2, . . . , Zm} of n-sided polygons in the plane and a query polygon W we give algorithms to find all Zl such that W = f(Zl) with f an unknown similarity transformation in time independent of the size of the collection. If f is a known affine transformation, we show how to find all Zl such that W = f(Zl) in O(n+ log(m)) time. For a pair W,W ′ of polygons we can find all ...

We consider energy transfer from an elastic actuator to load, and show that the can be optimized by tuning Young's modulus of impedance matching host material.

This paper proposes a new index to determine the static voltage stability of the load buses in a power network for certain operating conditions and hence identifies load buses which are close to voltage collapse. The proposed index is formulated from the quadratic equation derived from a twobus network and is computed using the apparent power and the line impedance. The proposed index shows how...

When performing in-situ measurements of conducted emission, it is not always possible to use a LISN (line impedance stabilisation network). This is especially the case when testing large machines, where a LISN with a high current capacity is needed. In this paper some alternative test methods are proposed to measure conducted emission. The measurements are compared to the LISN measurement and e...

In this paper a novel method for computing the radiation pattern and also the input impedance of a planar rectangular micro-strip antenna array with consideration of mutual coupling and mutual impedance is presented. Each two triangles with a common edge make an Edge element or RWG. Any such edge element is considered as an infinitesimal dipole. The electrical currents over each dipole can be c...

We describe the biological and medical applications of a new electric field sensor technology developed at Sussex. It provides an ultra-high impedance alternative to conventional low impedance Ag/AgCl electrodes used in electrophysiology and may even be used to acquire nuclear magnetic resonance signals via the electric field component of the free induction decay. Results are reported for both ...