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Performance and safety Improvement of Induction Motors based on Testing and Evaluation standards

CEs Transactions on Electrical Machines and systems 2024年第3期 310-318页

作者： nkosinathi s.khumalo Ntombizotwa P.Memane Udochukwu B.Akuru Department of Electrical Engineering Tshwane University of Technology IEEE

The induction motor, which converts electrical energy into mechanical energy, has been recognized as the cornerstone of industrialization. The rotor of an induction motor can be either a squirrel cage rotor or a wound-type rotor, both existing as magnetless topologies. Three-phase squirrel cage induction motors are frequently utilized in industrial drives because they are dependable, have high starting torque, are selfstarting and affordable. single-phase induction motors, on the other hand, are commonly used for small loads such as domestic appliances in form of modest fans, pumps and electric power tools. In south Africa, there have been reports of fires and explosions resulting in live and property loss because of induction motors that have not been thoroughly tested or are incorrectly labelled in terms of ratings, electrical safety and performance. The goal of this study is targeted at preventing end-user injuries and failures caused by non-compliant induction motors, by evaluating locally manufactured/imported induction motors based on tests and evaluation from standards(IEC and sANs). The study is conducted using experimental procedures at the Explosion Prevention Technology and Rotating Machines(EPT and RM) laboratory, south African Bureau of standards(sABs), south Africa. The main finding from the study shows differences in the nameplate characteristics of various induction motors which could have detrimental effects such as production and operational downtime in their end-use industries, at later stages.

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A Research on Women’s Leadership Experiences in south African Higher Education Institutions

A Research on Women’s Leadership Experiences in South Afric...

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作者： Minenhle khumalo 华中师范大学

学位级别：硕士

本研究通过在南非的高等教育机构进行的个案研究以探讨女性在高等教育中的领导经历。本研究旨在探索女性在高等教育机构取得领导职位的历程。本研究采用混合研究的方法,全面了解女性在追求高等教育机构领导地位时所经历的动态过程。研... 详细信息

本研究通过在南非的高等教育机构进行的个案研究以探讨女性在高等教育中的领导经历。本研究旨在探索女性在高等教育机构取得领导职位的历程。本研究采用混合研究的方法,全面了解女性在追求高等教育机构领导地位时所经历的动态过程。研究工具包括问卷调查和半结构化访谈。影响研究的理论框架是阿尔伯特·班杜拉(Albert Bandura)的社会认知职业理论,该理论后来1994年由罗伯特·韦伦特(Robert.W Lent),史蒂芬·D·布朗(steven ***)和盖尔·哈克特(Gail Hackett)进一步发展。本文对相关的国内外文献进行了全面的回顾,对不同的背景进行了分析,以了解女性在追求高等教育职权的过程中所面临的挑战和所采用的战略。研究结果显示,女性在高等学校发展职业兴趣、追求领导力和驾驭环境因素的经历包括了设定界限、优先考虑价值观,经历机会被阻碍,并理解坚持个人价值观和能力的重要性。此外,女性领导者还发现了一些在她们成为领导的旅程中有用的东西,例如自我效能感和参加讲习班的重要性。然而,女性领导人表示,南非高等教育中的一些女性更愿意由男性来领导而非女性,而且女性职员不支持其他女性升迁到高层职位。她们还建议,工作人员应该有合理的工作量,因为有些妇女不申请领导职位的主要原因之一是工作量过大,行政管理过多,而她们仍然要承担家庭责任。根据研究结果提出的一些建议是,如果高等教育的利益相关者希望招聘更多的女性担任高等教育机构的领导职务,他们应该有目的地、认真地审查机构环境与女性互动的方式。高等教育机构应该有一种工作文化,鼓励机构内的每一个人在取得进步的同时去实践工作与生活的平衡,并在招聘和晋升方面始终践行平等与公平。

关键词：高等教育机构女性领导者领导职务南非

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APsACC:Busy Launches,Great Opportunities

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China's Foreign Trade 2007年第21期 34-35页

作者： Alex khumalo

Asia Pacific south Africa Chamber of Commerce (APsACC) is a non-profit organization, whose primary objective is to facilitate the establishment and nurturing of mutually beneficial relationships between south African businesses and their Asian counterparts. Mr. Alex khumalo, the General Manager of APsACC secretariat made the APsACC launch in the Kunlun Hotel, Beijing, on October 24,2007.

关键词：亚洲太平洋南非地区商业贸易

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Ticks, Demographics, Vegetation Cover, and Farmer’s Age Influence Red Meat Production in Resource-Poor Regions of Eastern Cape Province of south Africa

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Open Journal of Animal sciences 2021年第4期11卷 682-696页

作者： Nkululeko Nyangiwe sindisile Goni Thami Khethani Tanki Thubela Mlungisi Jansen siza Mthi Mandla Yawa sive Tokozwayo Unathi Gulwa Ntanganedzeni O. Mapholi Ishmael F. Jaja Luxolo Qokweni Yanga Mkabile Mkabile sindile Magoda Zoleka Ntondini Zamantungwa T. H. khumalo Döhne Agricultural Development Institute Stutterheim South Africa Department of Agriculture and Animal Health University of South Africa Florida South Africa Department of Livestock and Pasture science Faculty of Science and Agriculture University of Fort Hare Alice South Africa Department of Rural Development and Agrarian Reform Kokstad South Africa Department of Rural Development and Agrarian Reform Bathurst South Africa Department of Rural Development and Agrarian Reform Port Elizabeth South Africa Department of Rural Development and Agrarian Reform Queenstown South Africa National Institute for Communicable Diseases Sequencing Core Facility National Health Laboratory Service Johannesburg South Africa Department of Veterinary Tropical Diseases Faculty of Veterinary Science University of Pretoria Onderstepoort South Africa

This study presents an integrated examination of livestock production constraints associating with communal farming in six district municipalities (DMs) of the Eastern Cape Province. We collected data on demographic and socio-economic factors from 271 farmers randomly given questionnaires. About 26 Land Redistribution for Agricultural Development (LRAD) owned by communal farmers were surveyed to ascertain the condition of grazing land, meanwhile, tick species and distribution on cattle and goats found in 158 sampling sites of the study area were also recorded. From the results, a total of 34,929 adult ticks belonging to five genera and 10 species were encountered. The most abundant tick genera were Rhipicephalus of the subgenus Boophilus (68.91%), Amblyomma (20.72%), Hyalomma (8.64%), Ixodes (1.22%), and Haemaphysalis (0.51%). By geographic distributions, Amblyomma and span style="font-family:Verdana;">Rhipic

关键词： Amblyomma Constraints Rangeland Conditions Rhipicephalus (Boophilus) microplus Tick Distribution south Africa

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