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An overview of the MITRA Radio Telescope signal chain MITRA射电望远镜信号链概述
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757828
Dominique G. K. Ingala, S. Macpherson
{"title":"An overview of the MITRA Radio Telescope signal chain","authors":"Dominique G. K. Ingala, S. Macpherson","doi":"10.1109/AFRCON.2013.6757828","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757828","url":null,"abstract":"The Multi-frequency Interferometer Telescope for Radio Astronomy (MITRA) is an international collaborative project between the University of Mauritius (UoM) and the Durban University of Technology (DUT). The objective of the project is to implement Very Long Baseline Interferometry (VLBI) between Mauritius and South Africa in the VHF/UHF band. This paper gives an overview of the signal chain of the DUT station.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116994849","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: 0
Security analysis of electric power supply in SADC region 南共体地区电力供应安全分析
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757702
Stacey Juliana Tombozi Mwale, I. Davidson
{"title":"Security analysis of electric power supply in SADC region","authors":"Stacey Juliana Tombozi Mwale, I. Davidson","doi":"10.1109/AFRCON.2013.6757702","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757702","url":null,"abstract":"Over the last decade, Southern Africa has experienced electric power deficits due to the member countries' inadequate electrical power supply system. This partly induced the formation of organizations such as SADC and SAPP that have the common goal of achieving development and economic growth in the region which comprises of fifteen member countries. This paper presents results from a security analysis of the region's electric power supply system using a baseline level of performance. This was carried out by performing a contingency analysis on a SADC power network model subject to the N-1 criteria which expresses the ability of the power network to experience a contingency without causing an overload or failure in any other part of the network. Simulations were carried out using Power factory tool. The balance of the paper highlights the techno-economic standing of the SADC member countries/region.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117043004","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
High force tubular linear actuator with integrated eddy current brake for spring-loaded systems 用于弹簧加载系统的高力管状线性执行器，具有集成涡流制动器
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757738
Sebastian Gruber, B. Krüger, S. Soter
{"title":"High force tubular linear actuator with integrated eddy current brake for spring-loaded systems","authors":"Sebastian Gruber, B. Krüger, S. Soter","doi":"10.1109/AFRCON.2013.6757738","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757738","url":null,"abstract":"In order to meet safety standards in manufacturing industry many production machines are equipped with safety stop functions based on spring-loaded systems. This paper deals with an integrated eddy current brake of a high force tubular permanent magnet linear actuator for hydraulic applications with small actuating pathes. An analytical description of different design criteria for the integrated eddy current brake are shown. The special not rotational symmetrical design of the tubular linear actuator is transferred to a 2D transient FEM simulation model to predict the braking behavior caused by the spring load in case of an emergency stop. Measurements on a test bench are in good agreement with the simulation results and are used to validate the model.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116334151","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: 0
Decentralized adaptive robust controllers with simpler structure of uncertain large scale nonlinear interconnected systems 不确定大型非线性互联系统的分散自适应鲁棒简化控制器
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757648
Hansheng Wu, M. Deng
{"title":"Decentralized adaptive robust controllers with simpler structure of uncertain large scale nonlinear interconnected systems","authors":"Hansheng Wu, M. Deng","doi":"10.1109/AFRCON.2013.6757648","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757648","url":null,"abstract":"The problem of decentralized adaptive robust stabilization is considered for a class of uncertain large scale nonlinear interconnected systems. In the paper, it is only assumed that the uncertain nonlinear interconnection terms are bounded in any nonnegative nonlinear functions which are not required to be known. For such a class of uncertain large scale nonlinear systems, a new method is presented whereby a class of continuous decentralized local adaptive robust state feedback controllers with a simple structure is proposed. It is also shown that the solutions of uncertain large scale interconnected systems can be guaranteed to be uniformly exponentially convergent towards a ball which can be as small as desired. Finally, a numerical example is given to demonstrate the validity of the results.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123629146","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
Planning and management of sustainable microgrids: The test-bed facilities at the University of Genoa 可持续微电网的规划和管理:热那亚大学的试验台设施
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757862
S. Bracco, F. Delfino, F. Pampararo, M. Robba, M. Rossi
{"title":"Planning and management of sustainable microgrids: The test-bed facilities at the University of Genoa","authors":"S. Bracco, F. Delfino, F. Pampararo, M. Robba, M. Rossi","doi":"10.1109/AFRCON.2013.6757862","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757862","url":null,"abstract":"The aim of this paper is to describe the system composed by the SPM (Smart Polygeneration Microgrid) feeding the SEB (Sustainable Energy Building) at the University of Genoa (Savona Campus), and to assess the Campus operating costs, CO2 emissions, and primary energy annual savings determined by the combined SPM-SEB system. This work highlights the main difference between two scenarios (AS-IS and TO-BE) with specific reference to operation and management of various power units. As demonstrated by the work, besides research and testing of new devices, the SPM-SEB can be used also for demonstration and teaching activities, and contributes to increase the overall energy efficiency of the Campus, lowering its primary energy consumption.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129694535","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: 23
Compensating the effect of Doppler shift in a vehicular network 补偿车载网络中多普勒频移的影响
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757685
E. Feukeu, Karim D Djouani, A. Kurien
{"title":"Compensating the effect of Doppler shift in a vehicular network","authors":"E. Feukeu, Karim D Djouani, A. Kurien","doi":"10.1109/AFRCON.2013.6757685","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757685","url":null,"abstract":"Wireless channels operate through the transmission of electromagnetic signals from the transmitter to the receiver. In a fixed wireless network, the transmission medium is often distorted or disrupted by inherent natural phenomenon which in turn corrupt, obstruct or cause most of the data transmitted over the channel to generally get garbled. In a vehicular network, greater complexity is added as a result of the fast mobility of the nodes within the network. It therefore becomes very difficult for the receiver to decode the data transmitted efficiently. Based on the IEEE standard, communication between two mobile can only be possible if a minimum required threshold has been met. In this paper, a Direct Development Method (DDM) strategy is presented that seeks to combat the effect of Doppler Shift (DS) in a vehicular network. The proposed approach is developed based on the principle of basic communication theory and validated through simulations. It is demonstrated that it is possible to achieve a good communication link between two mobiles moving at the relative speed of up to 250 km/h taking into account the prescribed threshold.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129871145","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: 14
A case study for controlled islanding based on line contingency ranking in autonomous micro-grids 基于线路偶然性排序的自治微电网可控孤岛实例研究
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757794
M. Kirthiga, Pramodkumar Muppiddi
{"title":"A case study for controlled islanding based on line contingency ranking in autonomous micro-grids","authors":"M. Kirthiga, Pramodkumar Muppiddi","doi":"10.1109/AFRCON.2013.6757794","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757794","url":null,"abstract":"Micro-grids are formed on introduction of Distributed Generator(DG) units in conventional distribution systems. These micro-grids operate in either autonomous mode or non-autonomous mode. When line contingencies occur in micro-grids, there are chances for formation of accidental islands. This paper proposes an algorithm for forming controlled islands on occurrence of line contingencies in micro-grids, using the information about accidentally formed islands and line contingency ranking. Identification of such accidental islands has been attempted in this work, by tracing the change in the configuration of the autonomous micro-grids. Ranking of line contingencies is done with the database of the detected accidental islands. The proposed algorithm is also attempted for radial and weakly meshed structures based on the voltage profile, performance indices, line losses and transient stability of the DGs. MATLAB coding is developed to validate the proposed algorithm & the standard 33-node radial distribution system is used for validation of the proposed algorithm.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128557565","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
Attitude control of a CubeSat in a circular orbit using magnetic actuators 利用磁致动器控制立方体卫星在圆轨道上的姿态
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757619
Ajayi Michael Oluwatosin, Y. Hamam, Karim D Djouani
{"title":"Attitude control of a CubeSat in a circular orbit using magnetic actuators","authors":"Ajayi Michael Oluwatosin, Y. Hamam, Karim D Djouani","doi":"10.1109/AFRCON.2013.6757619","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757619","url":null,"abstract":"This paper deals with attitude tracking control of a spacecraft using magnetic actuators. The objective of this paper is to investigate the effectiveness of magnetic actuators for the Attitude Control System (ACS) of a CubeSat in a low earth circular orbit. This investigation is achieved via a proposed control law (set point regulator) based on the well known (model independent) PD controller. To validate this objective, two (2) cases representing the attitude manoeuvre were considered using SCILAB application software. A numerical orbit propagator was used to mimic the said circular orbit. Simulation results are presented showing the performance of the proposed solution.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129545810","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
Modelling of an RFID-based electronic vehicle identification system 基于rfid的电子车辆识别系统建模
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757662
H. Marais, M. Grobler, Johann E. W. Holm
{"title":"Modelling of an RFID-based electronic vehicle identification system","authors":"H. Marais, M. Grobler, Johann E. W. Holm","doi":"10.1109/AFRCON.2013.6757662","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757662","url":null,"abstract":"This paper investigates the suitability of UHF passive RFID for use in electronic vehicle identification (EVI) scenarios. A simulation scheme is developed that models each of the key elements within an EVI environment. Furthermore, the optimal installation angle of readers is determined, and a coverage map of a typical reader installation developed.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127089729","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: 8
Low phase noise cylindrical cavity oscillator 低相位噪声圆柱腔振荡器
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757867
Jacques Maree, J. Swardt, P. V. D. Walt
{"title":"Low phase noise cylindrical cavity oscillator","authors":"Jacques Maree, J. Swardt, P. V. D. Walt","doi":"10.1109/AFRCON.2013.6757867","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757867","url":null,"abstract":"A low phase noise oscillator operating at 9.2 GHz is presented. A cylindrical metal cavity with air as dielectric is used as the resonator. To minimize the phase noise of the oscillator, the resonator must be designed to have a high quality factor (Q-factor). A high Q-factor is obtained by designing the resonator to operate in the TE011 mode. A tuning screw is used to tune the resonant frequency without significantly affecting the Q-factor, while also separating the resonant frequencies of the degenerate TE011 and TM111 modes. The signal is coupled to the resonator by means of rectangular apertures. The coupling is designed to minimize the phase noise of the oscillator. A dual mode waveguide filter was developed and inserted into the oscillator loop in order to prevent oscillation at unwanted frequencies. The output signal of the oscillator was measured at different locations in the loop and clearly showed that the resonator can be used as a filter to minimize the phase noise. Phase noise levels of -115 dBc/Hz and -146 dBc/Hz were obtained at offset frequencies of 10 and 100 kHz.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127519823","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: 8
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