Robert J. Watson

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The optical properties of scattering media determine the attenuation (A) and the transit time (?t?) of light reflected from the medium as well as the phase (?) and modulation depth (M) of an intensity-modulated lightwave. Our primary finding is that the ratio of changes in A, ?, and M is approximately independent of the scattering properties and gives a(More)
BACKGROUND Photorhabdus are Gram negative bacteria that are pathogenic to insect larvae whilst also having a mutualistic interaction with nematodes from the family Heterorhabditis. Iron is an essential nutrient and bacteria have different mechanisms for obtaining both the ferrous (Fe2+) and ferric (Fe3+) forms of this metal from their environments. In this(More)
The accurate, quantitative analysis of absorption and scattering properties in tissue is a central problem in biochemical optics, in particular for the determination of hemoglobin and oxyhemoglobin concentrations. Because of light scattering, the absolute concentrations of these chromophores (i.e., the absorption coefficient) cannot easily be inferred. A(More)
This paper presents the results of a study into the modeling and prediction of rain-induced bistatic scattering at 60 GHz. The bistatic radar equation together with Mie theory is applied as the basis for calculating the scattering. Together with the attenuation induced by the medium before and after scattering, the received scattered power can be calculated(More)
Epithelioid hemangioendothelioma (EHE) is a rare malignant cancer of vascular origin that can affect multiple and varied tissue sites. A subtype of EHE, pulmonary epithelioid hemangioendothelioma (PHE), is more unusual with only 200 reported cases. Of these, only 27 have been classified as pleural in origin. Based on available literature, the average age of(More)
In this paper we present performance measurement methodologies for database systems. The methodologies are used to instrument a database system for t,esting and measurement. There are two types of testing and measurements. External performance measurement is used to test the database system from a macroscopic point of view. Thus, in the external performance(More)
OBJECTIVES Over half of the UK population holds a driver's licence. The DVLA have produced guidelines to ensure drivers with medical conditions drive safely. Doctors should ensure that patients are given appropriate information and advice if they have a medical condition affecting their driving. We sought to evaluate doctors' knowledge of DVLA guidelines.(More)