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(1) : We propose and experimentally validate a novel coding technique that allows the simultaneous transmission of several OCDMA channels and a SONET channel in the same WDM window, thus obtaining a truly OCDMA-overlaid WDM system. 1. Introduction. Recently, there has been a renewed interest in OCDMA due to its potential for offering increased levels of(More)
  • J G Young
  • 1981
Published reports of toxic hallucinosis during treatment with methylphenidate are rare. Two cases are described and it is suggested that methylphenidate-induced hallucinosis is more common than has been appreciated. Symptoms may be understood in terms of dose-related effects at pre- and postsynaptic receptors. Two other hypotheses that may clarify(More)
AIMS To evaluate the expression of vascular endothelial growth factor (VEGF) in uveal melanomas and correlate its presence with tumour characteristics and systemic metastasis. METHODS 47 cases of ciliochoroidal melanoma enucleated between 1983 and 1993 were retrieved from the pathology archives at the University of Western Ontario. Paraffin sections(More)
BACKGROUND Monitoring of urinary pH is an important part of the assessment of patients with urinary tract stones. It provides valuable information about the future stone risk of certain patients and further allows the effective tailoring of medical intervention. Accurate measurement is therefore essential in these patients. OBJECTIVE The purpose of this(More)
Thermoluminescence dosimetry (TLD) using LiF:Mg,Ti and electron spin resonance dosimetry using alanine (ALD) have been used to map the dose distribution in the sample chamber of a Gammacell-1000 Irradiator. The results showed that the dose rate to air varied by approximately 20% over the volume of the chamber. The mean ratio of the dose rates at various(More)