Browsing by Issue Date
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Ngowi, A.B.; Mselle, P.C. (MCB University Press http://www.emeraldinsight.com/10.1108/02632779810233511, November NaN, 1998)[more][less]
Abstract: By involving the beneficiaries of a facility such as housing or an irrigation scheme, at the various stages of the project, it is possible to build their capacity in relation to the facility, which may contribute to the sustainability of the project beyond the disbursement period. A study carried out in Botswana found that the intensity of community participation at the various stages of facility development is influenced by the complexity of the technology adopted and the willingness of the facility managers to involve the community from the early stages of the project. Based on these findings, this paper proposes a framework which may be followed to achieve this end. URI: http://hdl.handle.net/10311/407 Files in this item: 1
Ngowi_Fac_1998.pdf (382.5Kb) -
Taiwo, A.A. (Taylor & Francis, http://www.tandf.co.uk/journals, NaN, 1999)[more][less]
Abstract: The study was designed to elucidate the nature of the perception of the water cycle held by Botswana pupils in standards 4 to 7 of primary schools in three different areas (namely, remote area dwellers’ settlement, peri-urban and urban areas) of Botswana. The research design employed a survey method involving the administration of a structured instrument and interview sessions for data collection. Analyses of research data were carried out by both qualitative and quantitative methods. Among other things, the outcome of the study showed that the perception of water cycle held by the study sample was positively influenced by schooling but negatively impacted upon, to some extent, by the ’untutored’ ideas the children brought to school. URI: http://hdl.handle.net/10311/1111 Files in this item: 1
Taiwo_IJSE_1999.pdf (1.131Mb) -
Maundeni, T. (Routledge Taylor and Francis Group, NaN, 1999)[more][less]
Abstract: This article draws on existing literature and a field study conducted by the writer to explore the problems faced by African females when studying abroad. A comparative perspective is adopted and, whilst it is recognised that women are particularly disadvantaged in general, the principal thesis is that African women are particularly disadvantaged, especially when they undertake studies abroad. The article describes and analyses the disadvantages faced by women broadly throughout the world, by African women in general and in education in particular, and the difficulties they face when studying abroad. The implications for policy practice and research are considered and some short-and long-term strategies suggested whereby improvements could be effected. URI: http://hdl.handle.net/10311/896 Files in this item: 1
Maundeni_GE_1999.pdf (831.7Kb) -
Mwewa, W.L. (University of Botswana, www.ub.bw, NaN, 1999)[more][less]
Abstract: The demand for adequate training of artisans and apprentices in the construction industry cannot be over emphasized in view of the rapid changes the industry is undergoing. Many of of these changes are continously taking place especially in the areas of utilization and maintainability of construction materials. The local vocational institutions should vigorously embark on reviewing the vocational education and training. This will result in the supply of cadres with acceptible quality of training in order to meet the challenges of the building industry. In spite of the ten years of involvement by the local vocational institutions in the training of artisans and apprentices there is still shortage of skilled manpower. The aim of the paper, therefore, is to assess the relevance of the vocational training programs and the trends of output of artisans and apprentices trained before and after the second construction boom from boom from 1986 to 1990 and 1992 to 1996. URI: http://hdl.handle.net/10311/882 Files in this item: 1
Mwewa_BJT_1999.pdf (1.091Mb) -
Ssegawa, J.K. (University of Botswana, http://www.ub.bw, NaN, 1999)[more][less]
Abstract: By the turn of the century, Botswana will be 34 years old as an independent nation. Reflecting on the past, is a background of tremendous achievements from a socio-economic development perspective. The achievements could not have been possible if it was not for the contribution. The construction industry’s (CI) contribution to socio-economic development may be viewed from many areas, among them, creating employment, wealth and demand for manufactured goods, infrastructure and producing factors of production (e.g. office space, factory shells, roads, etc) for other sectors. However, the relationship between the general economy and the CI has not been established explicitly despite numerous studies. Using Botswana’s CI and the economy, some of the paradigms proposed in previous studies revisited. URI: http://hdl.handle.net/10311/843 Files in this item: 1
Ssegawa_BJT_1999.pdf (1.185Mb) -
Khartchenko, N.V.; Oladiran, M.T.; Douglass, G.W. (University of Botswana, http://www.ub.bw, NaN, 1999)[more][less]
Abstract: Coal is plentiful in many parts of the world but its combustion can create severe environmental and aesthetic problems.In the past three decades, the cost of crude oil and natural gas has been unstable and the reserves of these fuels are exhaustible. Other non-conventional energy resources, for example, solar, wind and tidal energy are only making a small contribution to the energy mix in few countries. Consequently, coal still has an important role to play to satisfy the energy demand, especially when it can be converted before combustion to other less environmentally objectionable forms, e.g. coal gas/producer gas. This paper describes the basic principles of coal gasification process and compares the performance of different gasifiers. The fundamentals of the raw gas cleaning methods are presented and experience to date of coal gasification in Botswana is discussed.It seems certain that coal gasification in tanderm with combined cycle power plant will be a principal technique for electricity generation in the next century. The paper recommends that Botswana takes necessary actions to gain maximum advantage from these developments. URI: http://hdl.handle.net/10311/710 Files in this item: 1
Khartchenko_BJT_1999.pdf (1.810Mb) -
Ssegawa, J.K. (University of Botswana http://www.ub.bw, NaN, 1999)[more][less]
Abstract: By the turn of the century,Botswana will be 34 years old as an independent nation. Reflecting on the past, is a background of tremedous achievements from a socio-economic development perspective.The achievement could not have been possible if it was not for the contribution from the various sectors of the economy, such as mining, agriculture, manufacturing and of course, construction. The construction industry's (CI) contribution to socio-economic development may be viewed from many areas, among them, creating employment, wealth and demand for manufactured goods, infrastructure and producing factors of production(e.g. office space, factory shells, roads, etc.) for other sectors. However, the relationship between the general economy and the CI has not been established explicitly despite the numerous studies. Using Botswana's CI and the economy, some of the paradigms proposed in previous studies revisited. URI: http://hdl.handle.net/10311/706 Files in this item: 1
Ssegawa_BJT_1999.pdf (1.950Mb) -
Mafela, L. (Research and Development Unit, University of Botswana http://www.thuto.org, NaN, 1999)[more][less]
Abstract: The dairy industry arose in Bechuanaland primarily as an alternative to beef production in response to South Africa's restrictions on the import of cattle from the Protectorate African dairy producers were at a disadvantage compared to settler farmers due to the lack of government support for the infrastructure essential for highly perishable dairy produce The decline of dairy production in the later colonial period can be attributed to the revival of beef exporting, which undercut the Administration's already limited interest. These events can be situated within the broader pattern of colonial underdevelopment. URI: http://hdl.handle.net/10311/699 Files in this item: 1
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Litchev, A.I.; Yanev, K.M. (University of Botswana, NaN, 1999)[more][less]
Abstract: Electromagnets are essentials for the operation of relays, contactors and other electromagnetic apparatus and take part in driving control and protective circuits of industrial processes and power systems. Performance of each electromagnet affects the driving time and the stability of operation of such circuits. This paper examines the improvement of the performance of AC electromagnets by using two diodes. The theoritical analysis lead to expressions for calculating the maximum, average and minimum values of coil-currents. Due to the electromagnetic processes in the coil, the current becomes pulsating but unidirectional and better force-gap characteristics are achieved. Consideration are made for reduction of the mass ferromagnetic and copper materials in the electromagnets and for decreasing teh responding time. URI: http://hdl.handle.net/10311/683 Files in this item: 1
Litchev_BJT_1999.pdf (924.8Kb) -
Kanyeto, O.J. (University of Botswana, NaN, 1999)[more][less]
Abstract: Advantages of using Finite Element Method (FEM)in structural engineering practice are presented in this paper.A brief description of the method is given with the aim to illustrate the rich solid mathematical basis that makes its foundation.The paper then presents some guidelines on how to build a good model for Finite Element Analysis (FEA) purposes. The guideline emphasises the need for the analyst to have a clear understanding of the physical problem and of the behaviour of the elements he employs to carry out the analysis.A practical example presented in order to illustrate the type of analysis and results that can be obtained from a commercial FE software package. This example forms part of the research work that was carried out by the author.And finally, it is recommended that all practicing structural engineers must learn the basics of finite element method, and be equiped with some FE software packagess. Since it is the most commonly used and trusted method in the world of engineering today. In order to keep up with the rest of the world in engineering advancements, the author finds it vital to equip all engineers with the latest engineering software packages and to elevate continuing engineering education. URI: http://hdl.handle.net/10311/681 Files in this item: 1
kanyeto_BJT_1999.pdf (1.860Mb) -
Rekha, A.; Raju, V.C.C. (University of Botswana, NaN, 1999)[more][less]
Abstract: The stress-attention in cascade reliability has been studied when both stess and strength follow Rayleigh distribution. The expression for the relaibility R(n), for a system survive with the first (n-1) components failed and the n component active, is obtained R(n) is calculated numerically, for n=1,2,3 and 4, for different values of the parameter p and the attention factor k. It has been found that with lower attention factors in high degree of reliability can be attained. URI: http://hdl.handle.net/10311/677 Files in this item: 1
Rekha_BJT_1999.pdf (887.1Kb) -
Inambao, F.L.; Mosweu, M. (University of Botswana, NaN, 1999)[more][less]
Abstract: It is widely recognised that air pollution caused by the global rapid increase of automobile traffic is a threat to the environment. With regard to automobiles there are three general areas of concern: urban pollution, especially in highly populated cities with high density of private transport, depletion of the ozone layer and pollution resulting in disturbance of natural environment. Several methods of effective control of automobile emsissions to meet current and future environmental demands are analyzed. URI: http://hdl.handle.net/10311/626 Files in this item: 1
Inambao_BJT_1999.pdf (951.9Kb) -
Ganesan, C.T. (University of Botswana, NaN, 1999)[more][less]
Abstract: Water scarcity in arid and semi-arid countries such as Botswana; call for judicious planning and economic use. In this connection many water saving components and appliances have been devised. One such system for example is the partial flushing unit fitted to water closets, which cause the volume and flow of water in the drainage system decrease, compared with the ordinary systems. To maintain a sufficient transportation in drainage pipes connected to low flush water closets (water closets with a flow less than 6 litres per flush)it is necessary to follow a set of rules used in conventional systems. Author suggests that in countries like Botswana where availability of water is unpredictable only 4 litres per flush can be allowed for successful operations. In this paper certain rules for design and dimensioning drainage pipes for water saving systems are proposed. Besides the paper presents a complete general survey of the influence of branches and bends illustrated by means of drawings and descriptions. URI: http://hdl.handle.net/10311/618 Files in this item: 1
Ganesan_BJT_1999.pdf (1.079Mb) -
Rwelamila, P. D.; Talukhaba, A .A.; Ngowi, A.B. (Emerald http://www.emeraldinsight.com, NaN, 1999)[more][less]
Abstract: The lack of 'ubuntu'(African group solidarity) between project stakeholders in the Southern Africa Development Community (SADC) public building sector has been surrounded by controversy and strongly held opinions. The work reported in this paper attempts to indicate some salient issues affecting the relationshps between project stakeholders. The Botswana public building sector is used as a main case study and follwo-up studies are carried out involving another eight SADC countries. The paper addresses two propositions.First, that the lack of 'ubuntu' between project stakeholders is primarily due to an inappropriate project organizational structure.Second, that a default traditional construction procurement system (TCPS) provides a poor relationship management system. Information is obtained on the research areas through questionnaires to confirm executives, contract managers, site managers, trade foremen and skilled tradeperson on the dominant procurement system used in Botswana. Furthermore, senior technical officers of Public Works Ministries of another eight SADC countries are interviewed as a follow-up to the Botswana study. The primary conclusion to be drawn is that the building procurement system purported to be in use in the SADC public building sector differs significantly from that recommended in the theory, resulting in poor relationships between project stakeholders. This is primarily due to the use of inappropriate building procurement systems. In general, the TCPS in the SADC public buiding sector is used as a 'default system.' This has led to a situation where project management is a 'firefighting' activity, where group solidarity between project stakeholders is out of reach. Salient steps are proposed with proviso that the SADC public building sector should establish appropriate methods of selecting building procurement systems as a prerequisite in formulating appropriate project organizational structures which will bring the spirit of real co-operation between project stakeholders towards project success. URI: http://hdl.handle.net/10311/612 Files in this item: 1
Rwelamila_ECAM_1999.pdf (1.580Mb) -
Mahgoub, S.E.O.; Ahmed, B.M.; Ahmed, M.M.O.; El Agib, E.N.A.A. (Elsevier; www.elsevier.com/locate/foodchem, NaN, 1999)[more][less]
Abstract: The effect of fermentation, germination and heating on the levels of thiamine, riboflavin and some mineral elements was studied in Sudanese kisra bread and hulu-mur drink prepared from the two sorghum cultivars dabar and fetarita, consecutively. Fermentation of kisra increased riboflavin but decreased thiamine significantly (p<0.01), whereas fermentation of hulu-mur reduced the levels of both vitamins significantly (p<0.01). Germination of fetarita grains for 6 days caused a significant (p<0.01) increase of riboflavin (700%) and a significant (p<0.01) reduction of thiamine (42%). Riboflavin was not affected by baking of kisra and thiamine level was slightly reduced. Hulu-mur baking caused significant (p<0.01) reduction of both thiamine and riboflavin. Fermentation caused no significant effect (p<0.01) on the mineral contents of kisra or hulu-mur. Addition of spices to hulu-mur dough caused significant increases (p<0.01) of strontium (80%), calcium (60%) and iron (35%). Germination of fetarita grains caused significant increases (p<0.01) of zinc (90%), lead (65%) and molybdenum (58%). Baking of kisra and hulu-mur did not cause any significant loss (p<0.01) in the contents of minerals. URI: http://hdl.handle.net/10311/215 Files in this item: 2
license.txt (1.998Kb)Mahgoub_FC_1999.pdf (1.152Mb) -
Morapedi, W.G. (Taylor & Francis, NaN, 1999)[more][less]
Abstract: This article grapples with issues that have largely remained outside the realms of migrant labour studies in colonial Botswana: the positive input of migrant wages to agricultural production and the effects of migrant wages on the differentiation of the peasantry. Although this article endorses the conventional view that migrant labour had detrimental effects on crop production and animal husbandry, it departs from previous studies in that it argues that the extent to which migrant labour led to `underdevelopment’ has not been suf® ciently demonstrated. It is also argued that migrant labour made it possible for those at the lower level of society to rise through the emerging strati® cations of the Tswana, and contributed positively to the general economies of the peasantries in Botswana’ s reserves URI: http://hdl.handle.net/10311/420 Files in this item: 1
Morapedi_JSAS_1999.pdf (2.123Mb) -
Abegaz, B.M.; Ngadjui, B.T.; Bezabih, M.; Mdee, L.K. (International Union of Pure and Applied Chemistry. http://www.iupac.org/publications/pac/, NaN, 1999)[more][less]
Abstract: Marketed plants are an important but a vulnerable group of plants whose investigations as well as conservation should be considered with priority. The chemistry, and in some cases biological activities of novel iso¯avonoids, nor-lignans, anthracene and naphthalene derivatives and poly prenylated ¯avonoids isolated and characterized from Hagenia abyssinica, Salsola somalensis, Hypoxis spp., Taverniera abyssinica, Aloe spp., Bulbine capitata, Rhamnus prinoides and Dorstenia spp. are discussed. URI: http://hdl.handle.net/10311/289 Files in this item: 1
Novel natural products.pdf (4.533Mb) -
Nindi, M.M.; Kgarebe, B.V.; Wolfender, J.L.; Abegaz, B.M. (John Wiley & Sons, Ltd., NaN, 1999)[more][less]
Abstract: Three naphthalenic derivatives, four flavonoids and two of the four anthraquinones previously isolated from the leaves of Rhamnus prinoides were successfully ionised under electrospray ionisation conditions. These compounds were subsequently detected in the leaf extract of the plant using electrospray liquid chromatography–mass spectrometry (LC–ESI–MS). The potential of LC–ESI–MS for screening a leaf extract, with the focus on the suitability of the method for assaying the bitter principle, geshoidin, of this commercially important plant, is presented. URI: http://hdl.handle.net/10311/290 Files in this item: 1
Electrospray Liquid.pdf (1.464Mb) -
Mahgoub, S.E.O. (Kluwer Academic Publishers; Springer Netherlands http://www.springerlink.com/content/t218k71qq13p5476/, March NaN, 1999)[more][less]
Abstract: Five weaning formulations (F1-F5) based on sorghum, groundnuts, sesame seeds, chickpeas, and skim milk powder were processed by a twin-roller drum dryer and evaluated for composition, functional properties (bulk density, water absorption capacity, and apparent viscosity), in vitro indices (protein digestibility and available lysine), protein quality (PER, NPR, and NPU) and effects of feeding on rat livers. Composition and properties of the five formulations were compared to those of Cerelac. The results indicated that F3 (60% sorghum, 20% chickpeas, 5% sesame, 8.5% skim milk powder, 5% sugar, and 1.5% vitamins and minerals) and F2 (55% sorghum, 15% chickpeas, 5% groundnuts, 10% sesame, 8.5% skim milk powder, 5% sugar, and 1.5% vitamins and minerals) formulations had compositions and properties comparable to those of Cerelac and hence have a good potential for use as weaning foods. URI: http://hdl.handle.net/10311/213 Files in this item: 3
license.txt (1.998Kb)license.txt (1.998Kb)Mahgoub_PFHN_1999.pdf (371.8Kb) -
Oladiran, M. T. (Institute of Electrical and Electronics Engineers (IEEE), http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=13, August NaN, 1999)[more][less]
Abstract: This paper presents the results of an investigation to determine the level of continuing professional development (CPD) for engineers in developing countries. Questionnaires were administered randomly to engineers of different specialties. It was found that CPD for engineers in developing countries seems neglected. Experience and state of the art in the profession are, thus, not usually acquired in an organized fashion. Nevertheless, many of these engineers would support the introduction of continuing professional development at all levels of their careers. URI: http://hdl.handle.net/10311/666 Files in this item: 1
Oladiran_IEEETE_1999.pdf (763.3Kb)