Type
Now showing items 1-20 of 591
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250kW transformer-less voltage dip compensator
(1999)Voltage dips cause serious problems for sensitive equipment in industrial applications. The possibility of applying a transformer-less dip compensator is investigated as a cost-effective solution to overcome this hazard. ... -
25th European Symposium on Calcified Tissues entitled 'Defining Typologies in Osteoporosis', Harrogate, April 25, 1997 : Fast and slow bone losers: Relevance to the management of osteoporosis
(1998)A low bone mineral density (BMD) is presently regarded as the most important risk factor for the development of osteoporosis. BMD is a function of peak bone mass attained during growth and subsequent age-related bone loss. ... -
5- and 6-glycosylation of transferrin in patients with Alzheimer's disease
(2004)Transferrin is a glycosylated metal-carrying serum protein. One of the biological functions of glycosylation is to regulate the life span of proteins, less glycosylation leading to a faster clearance of a protein from the ... -
9th biennial scientific meeting of the International Association for Craniofacial Identification 24-29 July 2000, Washington DC.
(2001)[No abstract available] -
A 21-year-old patient with acute myeloid leukemia and bilateral pulmonary infiltrates
(2001)[No abstract available] -
A comparative study of the effects of cholesterol, beta-sitosterol, beta-sitosterol glucoside, dehydroepiandrosterone sulphate and melatonin on in vitro lipid peroxidation
(2000)The free radical scavenging abilities of the structurally related steroids beta-sitosterol, beta-sitosterol glucoside (plant sterols and sterolins), cholesterol, and dehydroepiandrosterone sulphate (DHEAS) were compared ... -
A comparison between measured leakage current and surface conductivity during salt fog tests
(2004)This paper deals with an Insulator Pollution Monitoring Relay (IPMR), designed to measure and monitor pollution on high voltage insulators. The IPMR determines the pollution severity by measuring the surface conductivity ... -
A comparison of mesh termination schemes for 2D scattering analysis using the finite element method
(2007)When the finite element method is used for scattering problems, the outer boundary of the mesh has to be terminated appropriately so that it seems transparent to any outgoing waves. Various solutions to this problem have ... -
A comparison of Multi-criteria evaluation methods for RSFQ circuit optimization
(2011)Research has been done on the metaheuristic optimization of RSFQ circuits, but these are typically limited to single criteria (e.g., yield). The importance of using multiple criteria and the relevance of each of the criteria ... -
A computational fluid dynamics model of a spinning pipe gas lens
(2010)When a metal horizontal pipe is heated and spun along its axis, a graded refractive index distribution is generated which is can be used as a lens, thus its name, the spinning pipe gas lens (SPGL). Experimental results ... -
A control system analysis for a potential small geostationary satellite for South Africa
(2007)The availability of an indigenous communications satellite helps in driving down communication and entertainment costs of services obtained through such a satellite. The design and implementation of a small GEO satellite ... -
A distributed scheme for value-based bandwidth reconfiguration
(2009)This paper presents a scheme for reallocating bandwidth in path-oriented transport networks. At random time points, bandwidth is allocated to those paths that (possibly temporarily) value it most highly. The scheme acts ... -
A flying capacitor multilevel inverter with bootstrap-powered MOSFET gate drive circuits
(2002)The problem of non-technical power loss due to theft of electricity experienced in developing countries is of great concern. This is done mainly by tapping of the overhead AC reticulation networks and bypassing of metering ... -
A GPS based time-stamping and scheduling system for wide area power system measurements
(2002)This paper describes a synchronising and scheduling system for wide area synchronised data acquisition applications and fault location in power systems, using Global Positioning System (GPS) technology. The system hardware ... -
A graph-theoretic proof of the non-existence of self-orthogonal Latin squares of order 6
(2011)The non-existence of a pair of mutually orthogonal Latin squares of order six is a well-known result in the theory of combinatorial designs. It was conjectured by Euler in 1782 and was first proved by Tarry in 1900 by means ... -
A hardware emulator testbed for software defined radio
(2002)In software defined radio (SDR), most of the traditionally analogue signal processing, synthesis and analysis functions of a communications system are performed digitally. However, critical hardware system components (such ... -
A landscape with objects: Private game reserves, game lodges and the 'New Safari'
(2010)This paper investigates the proliferation of high-end private game reserves in Africa as the manifestation of an emerging economic but also symbolic and emotional investment in the value of nature. Increasing concern for ... -
A mechanism for zinc toxicity in neuroblastoma cells
(2004)Zinc is an important component of proteins essential for normal functioning of the brain. However, it has been shown in vitro that this metal, at elevated levels, can be toxic to cells leading to their death. We investigated ...