Search results for: P. Pillay
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Preeclampsia (PE) occurs as a result placental hypoxia-induced oxidative and endoplasmic reticulum stress, and is associated with the activation of hypoxia inducible factor-1α (HIF-1α) and apoptotic CHOP pathways with the consequential shedding of syncytiotrophoblast microvesicles which may be central in mediating the maternal systemic immune response. The aim of this study was to immune-localise...
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In high power applications such as static synchronous compensator (STATCOM) used for reactive power compensation, it is essential to reduce semiconductor losses and associated cost to a minimum value while maintaining desired key attributes. This paper presents a new hybrid switching STATCOM that addresses the semiconductor device losses while ensuring the usual STATCOM operating criterion. Design...
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Folia Morphologica > 2017 > 76 > 1
Background: The identification of an individual from skeletal remains plays a vital role in forensic investigation as it is essential for the identification of the individual’s age, sex, and/or race and further analysis. Skeletal characteristics differ from one population group to another since population-specific osteometric standards exist for sex determination. Since the mandible is the largest,...
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Machine simulation models allow the use of embedded numerical computation techniques. The numerical model and computational accuracy is usually gauged by comparison with experimental measurements. In this paper a large hydro generator is modeled and the sensitivity of various model parameters is investigated by comparing the simulated results with experimental measurements from four units of the same...
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Power production by conversion of salt gradient energy (osmotic power production) has potential for global commercialization. Research on the net-power output and plant configuration provide viable methods for efficient plant operation. In this paper, a novel equivalent electric-circuit model of the pressure retarded osmosis process (PRO) is described and, is used to develop a power hardware-in-the-loop...
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IEEE Transactions on Industrial Electronics > 2015 > 62 > 12 > 7578 - 7589
Slotted axial-flux machines have excellent power and torque densities. However, it is difficult to reduce their cogging torque due to the complexity associated with implementing classical techniques. In this paper, slot-opening widths and tooth profiles will be shown to be significant in mitigating cogging torque in these machines. In particular, varying the slot opening reduced it by 52%, whereas...
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Detection of lamination faults is key in the prevention of more serious generator core damage. Localized stator core faults occur frequently in rotational flux zones. Therefore, this paper studies the behavior of rotational flux in the presence of shorted laminations. Faults result in a redistribution of the magnetic field across the sample and hence the flux density distribution. Different sizes...
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This paper presents a novel algorithm for in-situ full-load efficiency estimation of induction motors operating under unbalanced voltages. The goal of this research work is to design a reliable in-situ efficiency estimation tool that can be used in industry to derate induction motors operating with unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations...
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Core losses in an electrical machine vary depending on the type of material, frequency and flux density. Loss prediction using pulsating models is insufficient for estimating core losses in a machine since it does not take into account rotational core losses. Moreover the superposition of pulsating losses in the radial and tangential direction overestimates losses especially at higher flux densities...
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The Fieldmetric measurement of 2-D core losses requires the use of orthogonal magnetic field H and flux density B sensors that are placed in a region of very high uniformity. It is difficult to achieve uniformity in the entire measurement region, in addition to the variation of B with magnetization directions. Therefore, there is a need to eliminate and/or reduce any contribution of a 2-D magnetizer...
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This paper discusses a method of estimating urban wind power and energy by means of wind tunnel experiments. A case study in one building in Montreal called Equiterre building is discussed in detail. The wind speed field measurements for Equiterre building for three months is used to calculate the wind power and energy. The calculated wind energy is compared with the estimation by a methodology presented...
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Applied Energy > 2013 > 108 > Complete > 308-322
We determine the threshold herd size at which a biomass waste to energy conversion system becomes commercially viable. The threshold herd size is found by optimisation of the biomass waste to energy conversion system for different herd sizes. Manure is co-digested with food waste. The optimisation takes into consideration revenue from electricity sales, use of the by-products of the digestion and...
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This paper examines the effect of tooth-width in the mapping of pulsating, elliptical and rotational losses in a tooth body for a given slot-pitch. Core loss distribution in the tooth is done with the use of FEA and 2-D core loss measurement results. The core loss distribution is computed using two methods, i.e., pulsating losses assuming all the flux-density in the stator is pulsating and elliptical...
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Renewable energy sources can help reduce many issues related to fuel consumption and environmental impact of diesel based electricity generation in autonomous power systems (mini-grids). However, the fluctuating nature of wind energy can make the power demanded from the diesel gen-sets and grid frequency vary more, increasing unit cycling and leading to power quality and maintenance problems. Sophisticated...
