发布求助
文献互助 智能选刊 最新文献

IEEE AFRICON. 6th Africon Conference in Africa,最新文献

筛选
英文 中文
Finite element analysis of a waveguide filter 波导滤波器的有限元分析
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159971
S. R. Clarke, D. Davidson
{"title":"Finite element analysis of a waveguide filter","authors":"S. R. Clarke, D. Davidson","doi":"10.1109/AFRCON.2002.1159971","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159971","url":null,"abstract":"The implementation of a vector element FEM code in MATLAB using brick elements is discussed. The code is designed for waveguide analysis, and it is used to analyze a waveguide filter. The results of this FEM code are compared to measurements and results obtained with an independent FEM code.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127641003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Performance evaluation of an OFDM system employing Viterbi decoded QPR in AWGN channel conditions 基于Viterbi解码QPR的OFDM系统在AWGN信道条件下的性能评估
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146837
D.C. Bestbier, L. Linde
{"title":"Performance evaluation of an OFDM system employing Viterbi decoded QPR in AWGN channel conditions","authors":"D.C. Bestbier, L. Linde","doi":"10.1109/AFRCON.2002.1146837","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146837","url":null,"abstract":"Orthogonal frequency-division multiplexing (OFDM) has been shown to be a spectrally efficient modulation technique with inherent frequency diversity potential. Furthermore, by employing quadrature partial response (QPR) in an OFDM system, an even higher spectral efficiency can be obtained than with quadrature phase shift keying (QPSK) subcarrier modulation. Unfortunately, this is obtained at the cost of BER performance loss when compared to QPSK. However, this loss can be regained by using Viterbi decoding in the receiver. The paper presents a performance evaluation of an OFDM system employing Viterbi decoded QPR under additive white Gaussian noise (AWGN) channel conditions as an alternative to QPSK modulated OFDM.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121410303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Modelling a permanent magnet linear synchronous motor for control purposes 模拟永磁体直线同步电机的控制目的
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159992
C. E. Miller, A. van Zyl, C. Landy
{"title":"Modelling a permanent magnet linear synchronous motor for control purposes","authors":"C. E. Miller, A. van Zyl, C. Landy","doi":"10.1109/AFRCON.2002.1159992","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159992","url":null,"abstract":"In order to control the position, speed, acceleration and force of a Permanent Magnet Linear Synchronous Motor (PM-LSM) for single shaft ultra-deep level mining, a vector control strategy is being developed. The machine must first be modelled both mathematically and by using various simulation software to calculate the machine parameters before the system can be implemented. Various methods of finding the machine's parameters are discussed. Only steady state conditions have been investigated thus far.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123126005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
New developments in the management of power quality performance in a regulated environment 规范环境下电能质量性能管理的新发展
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160022
R. Koch, P. Balgobind, E. Tshwele
{"title":"New developments in the management of power quality performance in a regulated environment","authors":"R. Koch, P. Balgobind, E. Tshwele","doi":"10.1109/AFRCON.2002.1160022","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160022","url":null,"abstract":"This paper reviews recent developments in utility power quality, management in South Africa. Anew (and more comprehensive) regulatory framework is discussed in the context of experience with previous performance-based requirements. This framework will significantly change! the way in which power quality is addressed by all stakeholders (i.e. utilities, customers, and equipment suppliers) in South Africa. The role of proposed revisions to the NRS-048 Power Quality Standard are discussed with regard to this framework.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122240457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
X-band synthetic aperture radar evaluation platform x波段合成孔径雷达评估平台
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146798
J. Tait, W. Nel
{"title":"X-band synthetic aperture radar evaluation platform","authors":"J. Tait, W. Nel","doi":"10.1109/AFRCON.2002.1146798","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146798","url":null,"abstract":"CSIR and UCT, with funding from ARMSCOR, has been involved in the development of a VHF SAR since 1990, which in 2000/2001 produced images of several areas of South Africa, including interesting images over the Hermanus area. Development of this technology demonstrator proved to be an expensive exercise due to the large costs involved in initial flight tests of the SAR system. Experimentation regarding SAR processing is also very expensive. A cheaper alternative was to develop a static rail with a moving trolley to simulate the aircraft flight path. This paper describes the design and implementation of such an X-band SAR system developed at the CSIR. Data processing for this system was done in collaboration with UCT. The system uses a novel stepped frequency technique for obtaining the high bandwidths required for high range resolution. Encouraging results of initial systems tests are reported.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114068020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Unification of perception sources for perceptive awareness automatic systems 感知感知自动系统感知源的统一
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146849
C.T. Fuertes, G. Russ
{"title":"Unification of perception sources for perceptive awareness automatic systems","authors":"C.T. Fuertes, G. Russ","doi":"10.1109/AFRCON.2002.1146849","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146849","url":null,"abstract":"In order to design automatic systems in building automation supporting the capability of perceptive awareness, three specific functions are to be met: perception of the current situation, recognition of the current situation, and preventive reaction in response to the recognised situation. This paper considers the capability of perception by analysing the way this faculty is to be handled in a perceptive awareness automatic system. Human neuroscience is taken as the basis of the perceptive awareness model, therefore, references and similarities to the way perception takes place in humans are made.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123887725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Infra-red and ultra-violet imaging techniques applied to the inspection of outdoor transmission voltage insulators 红外和紫外成像技术在室外输电电压绝缘子检测中的应用
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159976
F. Bologna, N. Mahatho, D. Hoch
{"title":"Infra-red and ultra-violet imaging techniques applied to the inspection of outdoor transmission voltage insulators","authors":"F. Bologna, N. Mahatho, D. Hoch","doi":"10.1109/AFRCON.2002.1159976","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159976","url":null,"abstract":"The high voltage transmission network in South Africa contains a relatively high percentage of non-ceramic insulators. Techniques for assessing the condition of these insulators are under investigation. Such techniques include imaging techniques that take either an infra-red image or an ultra-violet image of the insulator. Such images may indicate some changes to either the external (visible) components of the insulator or to the internal (non-visible) components that may impact the long-term integrity of the insulator. This paper discusses the results of an investigation into these two imaging techniques applied to non-ceramic insulators.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125147789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
The measurement and assessment of corona power losses on 400 kV transmission lines 400kv输电线路电晕损耗的测量与评价
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159980
A.E. Loxton, A. Britten
{"title":"The measurement and assessment of corona power losses on 400 kV transmission lines","authors":"A.E. Loxton, A. Britten","doi":"10.1109/AFRCON.2002.1159980","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159980","url":null,"abstract":"This paper presents the results of measurements of conductor corona losses on two open-circuited 400 kV transmission lines, one 85 km long and the other 143.2 km long. The results are compared with those obtained under test conditions in a local corona cage. From these it is shown that the loss predictions from the cage excitation functions (for the relevant conductors and conductor surface gradients) agree tolerably with the losses measured in both wet and dry conditions on the two lines. The overall errors and uncertainties in the CVT, CT and wattmeter measurements are also assessed.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114298921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
An effective memory addressing scheme for multiprocessor FFT system 一种有效的多处理器FFT系统内存寻址方案
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146801
D. Dawoud
{"title":"An effective memory addressing scheme for multiprocessor FFT system","authors":"D. Dawoud","doi":"10.1109/AFRCON.2002.1146801","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146801","url":null,"abstract":"The memory organization of FFT processors is considered. A new memory addressing scheme is given. The proposed scheme considers the case of using two modules of two-port memory and allows the processing of the butterflies in the form of groups of two. The addressing assignment allows, without any conflict, simultaneous access to the data needed for the two butterflies and to write back the four outputs to the same places. The advantages of this memory-addressing scheme lie in the fact that it reduces the number of the cycles of butterfly calculations of FFT to half and it reduces the delay of address generation to minimum.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123026329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Management and application of protection performance data on the Eskom transmission system Eskom输电系统保护性能数据的管理与应用
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160036
P.G. Keller
{"title":"Management and application of protection performance data on the Eskom transmission system","authors":"P.G. Keller","doi":"10.1109/AFRCON.2002.1160036","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160036","url":null,"abstract":"The performance of protection systems on the Eskom Transmission network is very important for the safety of human life and in limiting damage to plant. Measuring the performance of these protection systems enables better maintenance to be done and assists in refurbishment programs. This paper explains how protection performance data is managed and how it can be used.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"1377 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132540215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书