Graham Matthews

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MAGMA is a new software system for computational algebra, number theory and geometry whose design is centred on the concept of algebraic structure (magma). The use of algebraic structure as a design paradigm provides a natural strong typing mechanism. Further, structures and their morphisms appear in the language as first class objects. Standard(More)
Since 1987 onchocerciasis control has relied on the donation of ivermectin (Mectizan®, Merck & Co., Inc.) through the Mectizan Donation Programme. Recently, concern has been raised over the appearance of suboptimal responses to ivermectin in Ghana – highlighting the potential threat of the development of resistance to ivermectin. This report summarises a(More)
BACKGROUND Legislation and regulation of pesticides used in public health are essential for reducing risks to human health and the environment. OBJECTIVE We assessed the global situation on legislation and regulatory control of public health pesticides. METHODS A peer-reviewed and field-tested questionnaire was distributed to 142 member states of the(More)
Reservoir releases may be specified to flush interstitial fine sediment from gravel beds in the river downstream. Choice of an effective flow depends on trade-offs among discharge, flow duration, and pool dredging as they determine rates of bed mobilization, sand removal, and gravel loss. A basis for evaluating these trade-offs is developed with an(More)
It is critical that vector control pesticides are used for their acceptable purpose without causing adverse effects on health and the environment. This paper provides a global overview of the current status of pesticides management in the practice of vector control. A questionnaire was distributed to WHO member states and completed either by the director of(More)
In the tropical rainforest area of Cameroon, people are affected by blackflies (Simulium spp.) and mosquitoes (Anopheles spp). Use of insecticide-treated bed nets (ITNs) has been promoted to protect vulnerable groups from mosquito bites, whereas historically indoor residual spraying (IRS) was the primary intervention. In a malaria-endemic area, a pilot(More)
PURPOSE The present investigation looks in detail at the causes and types of health incidents reported by 6,300 mainly smallholder agrochemical users in 24 countries during 2005 and 2006. METHODS The investigation is based on a questionnaire survey of knowledge, attitude and practice that concentrated on the sequence of events from purchasing the(More)
A number of companies have promoted their on-chip busses as potential standards for the SoC industry. VSIA’s On-Chip Bus Development Working Group chooses to develop a Standard Bus Wrapper (VCI) as opposed to endorsing a single bus as the standard. Standard Bus advocates claim Wrappers incur performance and area overhead. Bus Wrapper advocates claim no(More)