Browsing by Title
-
Mark, M. (University of Botswana, http://ub.bw, NaN, 2007)[more][less]
Abstract: Botswana is facing one of its greatest development challenges at the moment. It is facing an HIV/AIDS pandemic of immense proportions. It is among the countries in the world that have been hard hit by this scourge. A lot of stakeholders including government, private companies, international donor agencies, and civil society have come up with interventions to respond to challenge of fighting this pandemic. Among the key players in this fight against HIV/AIDS are civil society organizations, commonly known as NGOs. These organizations play a crucial role of bringing HIV/AIDS services to the communities where the other players may not reach or may not be effective. The services the NGOs offer to communities are normally delivered as projects. Effective monitoring and evaluation of projects is usually one of the ingredients of good project performance and provides means of accountability, demonstrating transparency to the stakeholders and facilitates organizational learning for benefit of future projects. This study sought to determine how effectively the HIV/AIDS projects implemented by Gaborone based local NGOs are monitored and evaluated. The study investigated the monitoring and evaluation practices of the NGOs and compared them with the best practices. It also sought to identify the challenges the NGOs faced in carrying out this function. Data for the study was collected using the descriptive survey method where a questionnaire was administered to project managers and monitoring and evaluation officials of the NGOs. The results of the study show that most of the NGOs (66.7%) were implementing Behavioral Change Communication projects. The study also determined that the monitoring and evaluation practices of the local NGOs fell short of the best practices. Most of the best practices were inconsistently done and others were not done at all. Planning for monitoring and evaluation was inadequately done and inconsistently by respondents. Implementing the monitoring and evaluation process was not effectively done by the respondents. The study also identified quite a number of challenges the NGOs faced in carrying out monitoring and evaluation of the projects they faced. These challenges made it hard for the NGOs to effectively monitor and evaluate the projects they implemented. The most significant ones included; inadequate finances, lack of expertise, stringent and multi-donor reporting requirements, lack of baseline data. The study made some recommendations in order to mitigate the challenges faced by the NGOs. The study found out that, all in all the projects implemented by the local NGOs were not effectively monitored and evaluated. URI: http://hdl.handle.net/10311/991 Files in this item: 1
Mark-MEPC_2007.pdf (7.970Mb) -
Temtime, Z.T. (International Journal of Globalisation and Small Business; Inderscience Enterprises Ltd; http://www.inderscience.com/browse/index.php?journalCODE=ijgsb, NaN, 2006)[more][less]
Abstract: The process of gathering and interpreting pertinent information from the environment and introducing the results into the business planning process is referred to as environmental scanning. This paper investigates the practices and perceptions of Small and Medium Enterprises (SMEs) in monitoring environmental complexities and changes through the use of different scanning sources and frequency. Data were collected from 44 SMEs in Botswana through questionnaire and analysed using simple descriptive statistics. The findings indicated that SMEs in Botswana do monitor their environment and use all the major scanning sources with different degrees of frequency. Though more importance is attached to the customer/market, competition and economic sectors, owner-managers in Botswana tend to rely more on impersonal (written) and internal sources as opposed to personal (informal) and external sources to analyse an increasingly uncertain sector. This is in contrast to previous findings, since information from these sources is less reliable for analysing unstable, turbulent and hard-to-measure sectors than personal and external sources. The use of inappropriate scanning sources could be partially attributed to the fact that most SMEs in Botswana do not have an integrated management information system designed to capture, store and analyse environmental data for use in strategic decision-making processes. Further implications for SMEs and future research are highlighted. URI: http://hdl.handle.net/10311/49 Files in this item: 2
license.txt (1.998Kb)temtime_ijgsb_2006.pdf (157.1Kb) -
Mogobe, K.D.; Tshiamo, W.; Bowelo, M. (Reproductive Health Matters. www.rhmjournal.org.uk, NaN, 2007)[more][less]
Abstract: This paper describes the maternity monitoring system in Botswana, developed in 1998, and the main methods used: maternal death and morbidity reviews at service delivery level, analysis by the National Maternal Mortality Audit Committee of data from the reviews as reported on two forms, perinatal reviews and surveys using process indicators. We carried out a study of these findings to examine whether the system was working well. Surveys using process indicators in 2001 and 2006 were analysed. Other data examined were from 2004–2006 and early 2007. The Maternal Death Notification Form was found to be comprehensive but not all health facilities were submitting them and some gave incomplete information. In 2001, 70% of pregnant women attended antenatal care but access to emergency obstetric care was uneven. In 2006, 28 facilities with maternity services surveyed were providing 24-hour delivery care, but laboratory, theatre and blood supplies were more limited, and only 50% of doctors and 67% of midwives had life-saving skills. Antibiotics were widely available, but there were shortages of magnesium sulphate, diazepam, oxytocics and manual vacuum aspiration kits. Recommendations for improvements have been made, training for skilled attendants is ongoing and a medical school has just opened at the University of Botswana. A2007 Reproductive Health Matters. All rights reserved. URI: http://hdl.handle.net/10311/541 Files in this item: 1
Monitoring maternity.pdf (1.714Mb) -
Mogobe, K.D.; Tshiamo, W.; Bowelo, M. (Elsevier, www.rhmjournal.org.uk, NaN, 2007)[more][less]
Abstract: This paper describes the maternity monitoring system in Botswana, developed in 1998, and the main methods used: maternal death and morbidity reviews at service delivery level, analysis by the National Maternal Mortality Audit Committee of data from the reviews as reported on two forms, perinatal reviews and surveys using process indicators. We carried out a study of these findings to examine whether the system was working well. Surveys using process indicators in 2001 and 2006 were analysed. Other data examined were from 2004–2006 and early 2007. The Maternal Death Notification Form was found to be comprehensive but not all health facilities were submitting them and some gave incomplete information. In 2001, 70% of pregnant women attended antenatal care but access to emergency obstetric care was uneven. In 2006, 28 facilities with maternity services surveyed were providing 24-hour delivery care, but laboratory, theatre and blood supplies were more limited, and only 50% of doctors and 67% of midwives had life-saving skills. Antibiotics were widely available, but there were shortages of magnesium sulphate, diazepam, oxytocics and manual vacuum aspiration kits. Recommendations for improvements have been made, training for skilled attendants is ongoing and a medical school has just opened at the University of Botswana. URI: http://hdl.handle.net/10311/498 Files in this item: 1
DintleMogobe2007Mortality.pdf (944.3Kb) -
Selolwane, O. (African Sociological Review, NaN, 2006)[more][less]
Abstract: The main thesis of this paper is that Botswana's opposition parties are accountable for their failure to provide the voting public with a meaningful alternative to the ruling Botswana Democratic Party. While conceding the explanatory importance of other factors such as resource capacity, this paper departs from conventional wisdom by focusing on the strategic and ideological weaknesses of the opposition parties. it argues that the opposition parties made a number of strategic errors which rendered them electorally unattractive before they could establish their legitimacy as contenders for government power. To break the monopoly of power that the ruling party has so far enjoyed, Botswana's opposition must transform itself into a meaningful competitor and government-in-waiting. To do that they must (a)demonstrate that they have a viable, alternative economic management strategy to better satisfy the interests of a diverse voting public and (b)develop broad based political strategies targeting the diverse voting public to build voter confidence in the capability of the party as a possible government. The ruling party's track record of four decades of sustained economic growth leaves a formidable challenge to the opposition. URI: http://hdl.handle.net/10311/761 Files in this item: 1
Selolwane_ASR_2002.pdf (1.586Mb) -
Moleele, N.M.; Ringrose, S.; Matheson, W.; Vanderpost, C. (ScienceDirect, www.sciencedirect.com, NaN, 2002)[more][less]
Abstract: the cattle-dominated grazing areas of Botswana. Bush encroachment species – for instance Acacia tortilis, A. erubescens, A. mellifera, Dichrostachys cinerea, Grewia flava, and Terminalia sericea –are increasing in cover and density around foci points (e.g. water points and kraals) at the expense of the grass cover. A number of factors have the effect of encouraging the germination and survival of bush encroachment species. The practice of cattle husbandry and continual shifting of foci points within grazing areas have resulted in the spread of the distribution of bush encroachment species across the country. This is evidenced by the potential extent of 37 000 km2 (6 4% of Botswana) of darkened and near infrared (NIR) reflective bush encroached areas in 1994. This paper suggests that specific management strategies should be adopted to help overcome the bush encroachment problem, which is causing a significant reduction in the extent of Botswana’s high quality rangeland. These strategies may vary from the enforced reduction of grazing intensity in areas identified as being heavily bush encroached to the selective management of opportunistic (communal) grazing in better quality predominantly grassland areas. Further work is however required to update this analysis and especially to consider trends since 1994–1995. While some work on the extent of woody cover and the further causes of bush encroachment is being undertaken under the SAFARI2000 project, more research is needed in specific areas to pinpoint causes and responses to the bush encroachment problem. URI: http://hdl.handle.net/10311/985 Files in this item: 1
Moleele_ et al_More_Woody_2002.pdf (3.119Mb) -
Monyatsi, P.P. (Kamla-Raj Enterprises, http://www.krepublishers.com, NaN, 2006)[more][less]
Abstract: Productivity is the buzzword in all organizations worldwide. Organizations, including schools are busy trying to enhance the productivity of their employees by introducing a number of interventions or incentives. One of the interventions that was introduced in education in Botswana was teacher appraisal, and one of its objectives was to motivate teachers to improve their performance. This paper is based on a combined quantitative/qualitative study that was carried out from a sample of 607 secondary school teachers in seventeen schools in the South Region of Botswana evaluating the effectiveness of the current appraisal process as carried out in secondary schools. It looks at how the process of teacher appraisal can motivate teachers to improve their performance of facilitating effective teaching and students’ learning. The study revealed that if carried out properly, the appraisal process can motivate the teachers to do more. URI: http://hdl.handle.net/10311/649 Files in this item: 1
Monyatsi_JSocSci_2006.pdf (767.7Kb) -
Iyanda, O.; Ojo, O.S. (Emarald Group Publishing Limited, www.emeraldinsight.com/, NaN, 2008)[more][less]
Abstract: Purpose- The purpose of this paper is to examine the motivation, and perceived effect of information and communication technology (ICT) adoption in Botswana organisations. While a conceptual model of the adoption process in developed countries has been studied, not much empirical studies have been undertaken.This paper is an attempt to bridge the gap. Specifically, the paper addresses five questions; What motivated organisations in Botswana in their decesion to adopt ICT in their operations? What factors, internal and external, influenced the adoption decision? Which sources did the organisations contact for information on the adoption of ICT? What is the relative importance of those influences/motivating factors and information sources? What are the perceived effects of adoption?Design/methodology/ approach-The study was carried out using a survey method. The main intrument is a personally administered questionnaire that was based on items obtained and adopted from literature. Data were collected from a judgement sample of 29 business and public sector establishment, drawn from nine towns and cities of Botswana. The respondent in each organization was either the IT manager or the chief executive. The initial stage of the adoption process is examined by identifying in the sample Botswana organizations, the internal and external proponents of the ICT doption process, the sources from which organizations seek technical information, their perceived relative importance in the process and the effect of adoption on orgaizations activities. Findings - The study found that ICT application in Botswana was still at an elementary stage, mainly communications and recordkeepings. In terms of motivation and influence, the competitive motive and internal sources of information and influence were dominant and that the overall effect of ICT adoption on several organizational activities was moderately positive Originality/value - The identification of the key sources of influence and information for the adoption of ICT helps ICT marketing companies to target their marketing efforts more specifically, and services offered limited to basic needes that are relevant to use which ICT is currently applied in Botswana. Widespread adoption of ICT has turned it into a kind of 'hygiene' factor rather than a 'motivator'. In spite of the positive effect adoption has on various activities of aadopting organisations, adoption benefits arre matched by similar benefits of competing organisations, thus conferring no competitive advantages. It is only in the absence of adoption that those organisations adopting enjoy such competitive advantage. URI: http://hdl.handle.net/10311/787 Files in this item: 1
motivation influences.pdf (2.479Mb) -
Amey, KA.A.; Forcheh, N.; Setlhare, K. (Dove Medical Press Ltd. www.dovepress.com/, NaN, 2012)[more][less]
Abstract: Background: Predictive models for mortality due to human immunodeficiency virus (HIV) disease as a result of opportunistic infections, such as tuberculosis and pneumonia, have been developed. Methods: The data are taken from the Statistics South Africa multiple causes of death data for 2006 and 2007, which is available for public use. The dataset was compiled from death notifications, and contains up to five causes of death as well as some demographic characteristics of the deceased. The logistic regression modeling framework was used to model the presence or absence of HIV disease, given the predictive variables. Results: The higher the number of causes listed, the higher the likelihood that HIV would be a cause, with the percentage of notifications of HIV listed increasing from under 2% when only one cause is listed to almost 15% when 4–5 causes are listed. When the logit model was fitted to the multiple cause of death model, it was found that individual demographics were good predictors of the likelihood that the death notification would have HIV as one of the causes of death. Although there are highly significant differences in the likelihood that people of different demographics would die from HIV, the predictive power of these demographic factors on their own is very low, especially when there is only a single cause of death mentioned. With the full multiple cause of death model, two-way interactions between tuberculosis, pneumonia, and other opportunistic infections were highly significant, and their inclusion lead to significant improvements in the predictive power of the model. URI: http://hdl.handle.net/10311/1071 Files in this item: 1
Forcheh_OAMS_2012.pdf (302.7Kb) -
Simbiri, K.O.; Murakami, M.; Feldman, M.; Steenhoff, A.P.; Nkomazana, O.; Bisson, G.; Robertson, E.S. (BioMed Central Ltd. www.infectagentscancer.com/content/5/1/6, NaN, 2010)[more][less]
Abstract: Background: Ocular surface squamous neoplasia (OSSN) is a rare cancer that has increased in incidence with the HIV pandemic in Africa. The underlying cause of this cancer in HIV-infected patients from Botswana is not well defined. Results: Tissues were obtained from 28 OSSN and 8 pterygia patients. The tissues analyzed from OSSN patients were 83% positive for EBV, 75% were HPV positive, 70% were KSHV positive, 75% were HSV-1/2 positive, and 61% were CMV positive by PCR. Tissues from pterygium patients were 88% positive for EBV, 75% were HPV positive, 50% were KSHV positive, and 60% were CMV positive. None of the patients were JC or BK positive. In situ hybridization and immunohistochemistry analyses further identified HPV, EBV, and KSHV in a subset of the tissue samples. Conclusion: We identified the known oncogenic viruses HPV, KSHV, and EBV in OSSN and pterygia tissues. The presence of these tumor viruses in OSSN suggests that they may contribute to the development of this malignancy in the HIV population. Further studies are necessary to characterize the molecular mechanisms associated with viral antigens and their potential role in the development of OSSN. URI: http://hdl.handle.net/10311/565 Files in this item: 1
Multiple oncogenic.pdf (3.107Mb) -
Gnonlonfin, G.J.B.; Hell, K.; Fandohan, P.; Siame, A.B. (Elsevier B.V. www.elsevier.com/locate/ijfoodmicro, NaN, 2008)[more][less]
Abstract: The presence of fungi, aflatoxins and fumonisin B1 in cassava and yam chips (during 28 processing and storage) were evaluated during two consecutive seasons in two agroecological zones of Benin (Northern Guinea Savannah, NGS and Sudan Savannah, SS). The Benin samples were assessed for moisture content, fungal infestation and total aflatoxin and fumonisin B1 contamination. During the two seasons, samples collected from the NGS, had moisture contents ranging from 10.0 to 14.7% in cassava chips and from 11.4 to 15.3% in yam chips. In samples from the SS, moisture content ranged from 10.1 to 14.5% and 11.1 to 14.5% in cassava and yam chips, respectively. A. flavus was the predominant fungal species. The maximum cfu/g in cassava and yam chips was 8950 and 6030, respectively. Other fungal species isolated included P. chrysogenum, M. piriformis, Phoma sorghina, F. verticillioides, R. oryzae and Nigrospora oryzae. High performance liquid chromatography analysis of both cassava and yam chips showed no contamination by either aflatoxins or fumonisin B1. URI: http://hdl.handle.net/10311/317 Files in this item: 1
Mycoflora and natural occurrence.pdf (5.959Mb) -
Cao, Y.; Allameh, S.; Sethiaraj, S. (Elsevier, NaN, 2006)[more][less]
Abstract: This paper presents the results of nanoindentation experimental studies of the contact-induced deformation in Au and Ag thin films. The paper examines the effects of film thickness and substrate deformation restraint on the mechanical properties of electron beam (e-beam) deposited Au and Ag films. Following a brief description of film microstructure, surface topography, and contact-induced pile-up deformation, film mechanical properties (hardness and Young’s modulus) were determined using nanoindentation techniques. The indentation size effects (ISE) observed in films with different thicknesses were explained using a mechanism-based strain gradient (MSG) theory. The intrinsic film yield strengths and hardnesses extracted from the MSG theory are shown to exhibit classical Hall–Petch dependence on the inverse square root of the average film grain size. Displacement bursts were also found to occur in Ag films at indentation load levels of 100 N. These were attributed to the initial onset of dislocation slip activity, when the shear stress exceeds the estimated theoretical shear strengths of the materials. URI: http://hdl.handle.net/10311/537 Files in this item: 1
Nanoindentation measurements.pdf (1.173Mb) -
Chilisa, B. (Taylor & Francis, http://www.tandf.co.uk/journals, NaN, 2002)[more][less]
Abstract: The article critiques pregnancy policies in the education systems in sub-Saharan Africa. Policies discussed are divided into expulsion, re-entry and continuation policies. Arguing from the standpoint of theories of oppression, it is postulated that expulsion policies symbolise direct violence against girls who become pregnant and are more common in those countries with poor human rights records. Continuation and re-entry policies are prevalent in countries that have ratified the Convention on the Elimination of all Forms of Discrimination Against Women and the Convention on the Rights of Children. It is argued that re-entry policies also violate girl mothers’ right to education through a retreat ideology that requires temporary withdrawal of the pregnant girl from school. Moreover, gender inequalities are built into the policies and supported by traditional and institutional ideologies that make re-entry of the girl mother into the school difficult. The Botswana re-entry policy is reviewed to illustrate difficulties in the readmission of girl mothers to school. URI: http://hdl.handle.net/10311/1040 Files in this item: 1
Chilisa_GE_2002.pdf (1.431Mb) -
Chilisa, B. (Routledge, http://www.informaworld.com, March NaN, 2002)[more][less]
Abstract: The article critiques pregnancy policies in the education systems in sub-Saharan Africa. Policies discussed are divided into expulsion, re-entry and continuation policies. Arguing from the standpoint of theories of oppression, it is postulated that expulsion policies symbolise direct violence against girls who become pregnant and are more common in those countries with poor human rights records. Continuation and re-entry policies are prevalent in countries that have ratified the Convention on the Elimination of all Forms of Discrimination Against Women and the Convention on the Rights of Children. It is argued that re-entry policies also violate girl mothers' right to education through a retreat ideology that requires temporary withdrawal of the pregnant girl from school. Moreover, gender inequalities are built into the policies and supported by traditional and institutional ideologies that make re-entry of the girl mother into the school difficult. The Botswana re-entry policy is reviewed to illustrate difficulties in the readmission of girl mothers to school. URI: http://hdl.handle.net/10311/835 Files in this item: 1
Chilisa_GE_2002.pdf (789.0Kb) -
Meck, M.L.; Masamba, W.R.L.; Atlhopheng, J.; Ringrose, S. (Elsevier Science Ltd, http://www.elsevier.com/locate/pce, NaN, 2011)[more][less]
Abstract: The objective of the study was to investigate the role played by the natural environment in protecting the transboundary Save River from the impacts of metals derived from phosphate mining at Dorowa. The study is a follow up study from a previous one that noted that there is natural attenuation at Dorowa. Water and sediment samples were collected in the Save River and the streams that drain the Dorowa dumps. Inductively coupled plasma mass spectrometry (ICP–MS) was used to analyze the cations (Na+, K+, Ca2+, Mg2+, Cu2+, Co2+, Fe2+, Ni2+, Zn2+, Pb2+, Sn2+, Mn2+, Cd2+) in the samples. Major anions Cl , SO2 4 and NO 3 were analyzed by standard chromatography whilst CO2 3 and HCO 3 were determined by titration. pH was measured on site. Geochemical modeling of the water composition was conducted with Visual Minteq. The results show that natural attenuation is being achieved through precipitation of solids from the water and subsequent deposition onto the sediments. Six of the metals are almost completely precipitated (Cu 99.99%, Fe 99.39%, Ni 91.24%, Pb 99.87%, Sn 99.99% and Zn 88.66%). However Mn, Co and Cd remain in solution. Thus the natural environment is protecting the Save River which is a transboundary river from the impacts of mining through precipitation of the metals. Users downstream of Dorowa mine are therefore not being affected by mining pollution. This study demonstrates that besides being a legitimate and important user of water, the natural environment can also play a significant role in protecting water quality by attenuating metals naturally. By analyzing costs incurred in several places where alternative methods are employed to remediate metal related pollution the study concludes that natural remediation at Dorowa is saving the nation in environmental costs. Therefore the paper advocates for appreciation of the role that the natural environment plays in protecting ecosystems from the impact of human developments and environmental costs. Subsequently, this calls for recognition of natural environment’s role in water resources management for the sustenance of ecosystems and peoples livelihoods. URI: http://hdl.handle.net/10311/963 Files in this item: 1
Atlhopheng_PCE_2011.pdf (630.3Kb) -
Murty, V.R.K.; Karunakara, N. (Elsevier, www.elsevier.com/locate/radmeas, NaN, 2008)[more][less]
Abstract: Studies on concentrations of primordial radionuclides in soil samples of Botswana were carried out. Measurements were made by gamma spectrometry employing a 41% relative efficiency HPGe detector. The activity of 226Ra was found to vary in the range 6.1–97.4 Bq kg 1 with a mean value of 34.8 Bq kg 1, 232Th in 7.4–110.0 Bq kg 1 with a mean value of 41.8 Bq kg 1 and that of 40K between 33.5 and 1085.7 Bq kg 1 with a mean value of 432.7 Bq kg 1 in surface soils. Existence of strong correlations in the distributions of these radionuclides indicates that an individual result for any one of the radionuclide is a good predictor of the concentration of the other. The mean value of effective dose, due to the 238U series, 232Th series and 40K in soil, was 0.07 mSV. The results of the present study are compared with the literature values reported for other normal background regions of the world and discussed. URI: http://hdl.handle.net/10311/493 Files in this item: 1
Murty2008SoilSamples.pdf (782.0Kb) -
Hambira, W.L. (Elsevier, http://www.elsevier.com/wps/find/journaldescription.cws_home/413/description#description, NaN, 2007)[more][less]
Abstract: Natural Resource Accounting (NRA) has become an important environmental/natural resources management tool in recent years. It provides information on stocks of a resource available at a particular point in time and what activities the resource is being used for. The conventional System of National Income Accounts (SNA) normally does not capture the cost of depletion, degradation or pollution of natural resources. This encourages unsustainable use of natural resources since the costs are not reflected when assessing the country’s economic performance or development progress. NRA is thus an attempt to integrate environmental issues into the conventional national accounts. The water sector is one sector that could greatly benefit from this natural resource management tool. Botswana has adopted NRA as a natural resource management tool and has so far developed accounts for minerals, livestock and water. The focus of this paper is on Water Accounting (WA) in relation to Integrated Water Resources Management (IWRM). IWRM is concerned with coordinated development and management of water in order to maximise economic and social welfare without compromising the sustainability of ecosystems. WA helps fill data gaps since it provides the required information for IWRM to be achieved. The aim of this paper therefore is to evaluate the Water Accounts of Botswana Report of 2006 to determine the extent to which it can contribute to integrated water resources management. The paper is based on literature review and the results show that: the available water stocks vary depending on rainfall patterns, well fields are over utilised, there has been growth in consumption, and more than 80% of the waste water produced is not being put to use. These results calls for changes in policies, role of institutions and practices pertaining to water resources management which is what IWRM is all about hence the paper concludes that indeed WA can contribute to the realisation of IWRM. URI: http://hdl.handle.net/10311/283 Files in this item: 1
-
Batibo, H.M.; Kopi, M.M. (University of Botswana, Department of English, http://www.ub.bw, NaN, 2008)[more][less]
Abstract: The aim of this study is to investigate sex-related euphemisms in Setswana. Although sex matters, as embarrassing phenomena, are not usually talked about in Setswana communities, they have recently been brought to the open by the incidence of the HIV/AIDS pandemic. The assumption in this study is therefore that, with more open discourse of sex-related matters in Botswana, more euphemisms have been created to camouflage the embarrassing nature of the various referents in this field. The sex-related matters include private parts, sexual activities, sexual secretions, sexual diseases and related phenomena. This study describes the nature, origin, and types of these euphemisms and considers their place and role in the social interaction of the people of Botswana. URI: http://hdl.handle.net/10311/852 Files in this item: 1
Batibo_MJLL_2008.pdf (2.902Mb) -
Malumbela, G.; Sebusang, N. (Faculty of Engineering and Technology, University of Botswana, www.ub.bw, April NaN, 2011)[more][less]
Abstract: Concrete is the widely used construction material worldwide. Therefore, for structural safety as well as to provide economic design, it is essential to understand well, its performance. Whilst in most developed countries extensive research has been done to characterise concrete, little is known about the performance of concrete in Botswana. This paper reviews previous work carried out in other countries to assess performance of their concrete. Focus is on influence of aggregate type. It is shown from the review that there is great need to study influence of aggregate on performance of concrete in Botswana, particularly comprehensive strength. A brief description of the needed research is outlined. URI: http://hdl.handle.net/10311/889 Files in this item: 1
Malumbela_BJT_2011.pdf (934.5Kb) -
Cailteux, J.L.H.; Kampunzu, A.B.; Lerouge, C. (Elsevier www.elsevier.com/locate/gr, NaN, 2007)[more][less]
Abstract: Rocks of the Neoproterozoic Mwashya Subgroup (former Upper Mwashya) form the uppermost sedimentary unit of the Roan Group. Based on new field and drill hole observations, the Mwashya is subdivided into three formations: (1) Kamoya, characterized by dolomitic silty shales/ siltstones/sandstones and containing a regional marker (the “Conglomerate de Mwashya” bed or complex); (2) Kafubu, formed by finely bedded black carbonaceous shales; and (3) Kanzadi, marked by feldspathic sandstones. Rocks of the Mwashya Subgroup are overlain by the Sturtian age Grand Conglomérat diamictite (equivalent to the Varianto/Brazil and Chuos/Namibia diamictites), and conformably overlie rocks of the Kansuki Formation (former Lower Mwashya), a carbonate unit containing volcaniclastic beds. New geochemical data confirm the continental rift context of this magmatism, which is contemporaneous with rift-related volcanism of the Askevold Formation (Nosib Group, Namibia). A gradational lithological transition between rocks of the Kansuki and the underlying Kanwangungu Formations, and similar petrological composition of these two formations, support the hypothesis that the Kansuki is the uppermost unit of the carbonate-dominated Dipeta/Kanwangungu sequence, and does not form part of the Mwashya Subgroup. Base metal deposits, mostly hosted in rocks of the Kansuki Formation, include weakly disseminated early-stage low-grade Cu–Co mineralisation, which was reworked and enriched, or initially deposited, by metamorphic fluids associated with the Lufilian orogenic event. URI: http://hdl.handle.net/10311/399 Files in this item: 1
Kampunzu2007Neoproterozoic Mwashya.pdf (2.801Mb)