Browsing by Title
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Cainelli, F.; Vallone, A. (Dove Medical Press Ltd. http://www.dovepress.com/biologics-targets--therapy-journal, NaN, 2009)[more][less]
Abstract: Kaposi’s sarcoma is a vascular tumor linked to the presence of Kaposi’s sarcoma-associated herpesvirus (human herpesvirus-8) and the incidence of which has increased considerably the world over after the onset of the human immunodeficiency virus (HIV) pandemic. Antiretroviral therapy combined with cytotoxic agents has been established as the treatment of choice in the past 10 years. Among chemotherapeutic agents, pegylated liposomal doxorubicin has become the preferred one for patients with HIV-associated Kaposi’s sarcoma in Western countries. The drug in this formulation localizes better to the tumor and has higher efficacy. Skin toxicity, mucositis, and leukopenia/neutropenia are the main side effects. Hepatotoxicity and mild cardiotoxicity are observed less frequently. Pegylated liposomal doxorubicin impacts favorably on quality of life. Although cost effective in Western countries, the drug is less so in developing countries. URI: http://hdl.handle.net/10311/419 Files in this item: 1
Safety and efficacy.pdf (737.4Kb) -
Vanderpost, C.; Ringrose, S.; Matheson, W.; Arntzen, J. (Elsevier, December 14, 2010)[more][less]
Abstract: A methodology was devised for comparison of generalised range condition over time, irrespective of the nature of original imagery used. It was applied for range condition change mapping throughout Botswana through 1984-2000. Results showed that range degradation was most widespread during the 1980s drought when 25% of the country was affected, decreased to 6.5% in 1994 and increased to 9.8% in 2000. This suggests that these semi-arid rangelands are fairly resilient and can withstand “normal” droughts even under conditions of heavy grazing pressure. However, degradation that persists during normal or above average rainfall years is related to increasing livestock and other pressures on rangelands and may represent areas with severe range recovery problems. This application meets some requirements of a semi-arid developing country looking to improve range condition monitoring over relatively remote areas. URI: http://hdl.handle.net/10311/779 Files in this item: 1
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Shaibu, S.; Phaladze, N.A. (Cambridge University Press. http://journals.cambridge.org/action/displayJournal?jid=PHC, NaN, 2010)[more][less]
Abstract: This paper reports an evaluation of the implementation of the School Health Policy (SHP) in Botswana schools. Historically, school health originated with a concern for the number of children being excluded from school owing to communicable diseases. In 1999, the three ministries, Ministry of Health, Ministry of Education and Ministry of Local Government, developed the Botswana School Health Policy and Procedures Manual. The school health services are organized at national, district and local levels. The purpose of the evaluation was to explore how school health services were delivered in schools in Botswana. Data on current practices on school health were collected using observations, field notes and interviews of various school personnel in 27 schools located in the Gaborone district, and surrounding villages using the assessment guide in the SHP. Content analysis was used to analyse the data. Several challenges to implementing the school health policy were identified, for example, lack of human resources, lack of equipment supplies, lack of health knowledge among teachers, as well as organizational problems. This has budgetary implications for Botswana at both central and district levels. Commitment of all stakeholders in all ministries concerned would also improve the implementation of school health services. URI: http://hdl.handle.net/10311/563 Files in this item: 1
School health.pdf (911.5Kb) -
Massamba, F. (Birkhäuser Basel. http://www.springerlink.com/content/110963/?p=c42ba01ff0bd482b81a3ebdf3b649c9a&pi=0, NaN, 2009)[more][less]
Abstract: We investigate lightlike hypersurfaces of indefinite Sasakian manifolds, tangent to the structure vector field and whose screen distribution is integrable. We prove some results on parallel vector fields and on a leaf of the integrable distribution D0? h i of this class. A theorem on a geometrical configuration of the screen distribution is obtained. We show that any totally contact umbilical leaf of a screen integrable distribution of a lightlike hypersurface is an extrinsic sphere. Description: The mathematical symbols may not come as they are in the abstract. URI: http://hdl.handle.net/10311/689 Files in this item: 1
Screen Integrable Lightlike.pdf (1.251Mb) -
Osei-Hwedie, K.; Ntseane, D.; Jacques, G. (Routledge Taylor and Francis Group, NaN, 2006)[more][less]
Abstract: Developing a tertiary academic programme in Botswana is not only an intellectual activity but also an institutional process that must be balanced to satisfy different stakeholders and contending claims. This paper focuses on the intellectual and institutional processes of developing a Master in Social Work(MSW) programme at the University of Botswana. It discusses the intricacies of identifying the need for a MSW and the consultative process of designing the programme and course objectives, titles, and course content. The paper takes the view that institutional and intellectual issues are significant factors of the exercise of searching for appropriateness in social work education in an African context. URI: http://hdl.handle.net/10311/744 Files in this item: 1
Osei-Hwedie_SWE_2006.pdf (1.212Mb) -
Veenendaal, E.; Kolle, O.; Lloyd, J. (Blackwell publishing, www.blackwellpublishing.com, NaN, 2004)[more][less]
Abstract: We studied the seasonal variation in carbon dioxide, water vapour and energy fluxes in a broad-leafed semi-arid savanna in Southern Africa using the eddy covariance technique. The open woodland studied consisted of an overstorey dominated by Colophospermum mopane with a sparse understorey of grasses and herbs. Measurements presented here cover a 19-month period from the end of the rainy season in March 1999 to the end of the dry season September 2000. During the wet season, sensible and latent heat fluxes showed a linear dependence on incoming solar radiation (I) with a Bowen ratio (β) typically just below unity. Although β was typically around 1 at low incoming solar radiation (150 W m−2) during the dry season, it increased dramatically with I, typically being as high as 4 or 5 around solar noon. Thus, under these water-limited conditions, almost all available energy was dissipated as sensible, rather than latent heat. Marked spikes of CO2 release occurred at the onset of the rainfall season after isolated rainfall events and respiration dominated the balance well into the rainfall season. During this time, the ecosystem was a constant source of CO2 with an average flux of 3–5 μmol m−2 s−1 to the atmosphere during both day and night. But later in the wet season, for example, in March 2000 under optimal soil moisture conditions, with maximum leaf canopy development (leaf area index 0.9–1.3), the peak ecosystem CO2 influx was as much as 10 μmol m−2 s−1. The net ecosystem maximum photosynthesis at this time was estimated at 14 μmol m−2 s−1, with the woodland ecosystem a significant sink for CO2. During the dry season, just before leaf fall in August, maximum day-and night-time net ecosystem fluxes were typically −3 μmol m−2 s−1 and 1–2 μmol m−2 s−1, respectively, with the ecosystem still being a marginal sink. Over the course of 12 months (March 1999–March 2000), the woodland was more or less carbon neutral, with a net uptake estimated at only about 1 mol C m−2 yr−1. The annual net photosynthesis (gross primary production) was estimated at 32.2 mol m−2 yr−1. URI: http://hdl.handle.net/10311/937 Files in this item: 1
Veenendal 2004 GCBiology.pdf (2.375Mb) -
Pheko, B.C. (SAGE Publications. http://ema.sagepub.com, January NaN, 2008)[more][less]
Abstract: This article analyses the views of selected headteachers on the impact of the 10-year basic education policy on the leadership skills of secondary school headteachers in Botswana. Research literature on school leadership and management in Botswana is sparse. Despite this, demands for effective leadership in schools have continued as the education system changes. In 1996, the Botswana Government started to implement a 10-year basic education programme, which rapidly increased student numbers at both community junior and senior secondary schools and building projects for school expansion became the order of the day. Secondary school headteachers have to manage these changes. A central focus of this article is their perceptions of the practice used to appoint them, leadership skills required for the post, their leadership training, and how training for leadership can be improved to meet the educational changes. Using results of the interview data collected from eight selected secondary school headteachers, this article exposes the limitations of the practice and procedures that are used in appointing headteachers to school leadership position and the established procedures intended to develop a skilled leadership force in secondary education to ensure quality education. The article highlights the need for Botswana to establish a leadership training policy to guide the training of headteachers and ensure that schools become effective. URI: http://hdl.handle.net/10311/536 Files in this item: 1
Pheko_EMAL_2008.pdf (990.7Kb) -
Kampunzu, A.B.; Cailteux, J.L.H.; Kamona, A.F.; Intiomale, M.M.; Melcher, F. (Elsevier www.elsevier.com/locate/oregeorev, NaN, 2009)[more][less]
Abstract: Stratabound epigenetic sulphide Zn–Pb–Cu ore deposits of the Central African Copperbelt in the Democratic Republic of Congo and Zambia are mostly hosted in deformed shallow marine platform carbonates and associated sedimentary rocks of the Neoproterozoic Katanga Supergroup. Economic orebodies, that also contain variable amounts of minor Cd, Co, Ge, Ag, Re, As, Mo, Ga, and V, occur mainly as irregular pipe-like bodies associated with collapse breccias and faults as well as lenticular bodies subparallel to bedding. Kipushi and Kabwe in the Democratic Republic of the Congo and Zambia, respectively, are the major examples of carbonate-hosted Zn–Pb–Cu mined deposits with important by-products of Ge, Cd, Ag and V in the Lufilian Arc, a major metallogenic province famous for its world-class sediment-hosted stratiform Cu–Co deposits. The carbonate-hosted deposits range in age from Neoproterozoic to early Palaeozoic (680 to 450 Ma). The formation of the relatively older Neoproterozoic deposits is probably related to early collision events during the Lufilian Orogeny, whereas the younger Palaeozoic deposits may be related to post-collisional processes of ore formation. Fluid inclusion and stable isotope data indicate that hydrothermal metal-bearing fluids evolved from formation brines during basin evolution and later tectonogenesis. Ore fluid migration occurred mainly along major thrust zones and other structural discontinuities such as karsts, breccias and faults within the Katangan cover rocks, resulting in ore deposition within favourable structures and reactive carbonates of the Katangan Supergroup. URI: http://hdl.handle.net/10311/380 Files in this item: 1
Kampunzu2009Sediment-hosted Zn.pdf (4.792Mb) -
Ringrose, S.; Huntsman-Mapila, P.; Kampunzu, A.B.; Downey, W.; Coetzee, S.; Vink, B.W.; Matheson, W.; Vanderpost, C. (Elsevier www.elsevier.com/locate/palaeo, NaN, 2005)[more][less]
Abstract: This work considers new evidence for palaeo environmental change taking place during the Pleistocene in northern Botswana. Duricrusted strandlines along the northeastern margin of Sua Pan provide palaeo-environmental data pertaining to the Makgadikgadi subbasin (MSB) with inferences regarding the larger Makgadikgadi–Okavango–Zambezi (MOZ) rift depression. Field, XRD and geochemical data show that MSB strandlines comprise calcretes (LU1 type), MgO-rich calcretes with silica (LU2 type), sil-calcrete (LU3 type) and silcrete (LU4 type). Early freshwater episodes appear to have been followed by calcrete-dominated drying phases interspersed with repeated silcretisation. Calcretisation through pan littoral sediments may have been both biogenically and environmentally induced. Calcite precipitation was in part controlled by the Mg/Ca ratio of pore water in the pan littoral zone suggesting closed basin type evaporative conditions, which were followed by a major desiccation interval. Phases of silcrete precipitation appear to be related to periods when the geochemistry of the lake littoral more closely resembled present-day Na–CO3–SO4–Cl-type brines. Silica saturated acidic, moderately saline groundwater preceded Si precipitation which took place as the pH reduced. Si mobilisation occurred (inter alia) as a result of quartz grain dissolution enhanced by diatoms, bacteria and algal growth in the moist pan littoral. SiO2-rich pore waters migrated through cracked and desiccated calcrete into areas of lower salinity and lower pH resulting in preferential calcite removal and silcrete precipitation. Approximate TL dates imply that exposed littoral sand underwent calcretisation during the drying phases of extensive palaeo-lakes which occurred prior to 110 ka, 80–90 ka and 41–43 ka. These wet periods compare fairly well with Vostok core chronologies for southern Africa. URI: http://hdl.handle.net/10311/794 Files in this item: 1
Kampunzu2006Sedimentological.pdf (3.498Mb) -
Moleele, N.M.; Reed, M.S.; Motoma, L.; Seabe, O. (John Wiley and Sons, http://www.wiley.com, NaN, 2005)[more][less]
Abstract: Laboratory-based seed storage systems have been developed as an alternative to in situ conservation for indigenous woody plant species. However, interactions between seed quality and environmental variables must be known for each species prior to seed collection, storage and sowing to ensure effective conservation. This study investigated Acacia tortilis seed weight/quality patterns across seven Botswana seed provenances in relation to: soil nutrient status, altitude; latitude; slope angle; % grass cover; height and density of other woody plants nearby. The higher rainfall and relatively eutrophic seed provenances of northwestern Botswana (Chobe, Okavango and Makgadikgadi) were associated with large A. tortilis species and seeds, as well as higher densities of woody plants. Spatial variation in seed weights of A. tortilis was principally a function of rainfall and soil organic carbon. Although more work is required to establish the relationship between seed weight and germination rates for A. tortilis, this research suggests that seed collection should focus on sites with high levels of rainfall and soil organic carbon. URI: http://hdl.handle.net/10311/947 Files in this item: 1
Moleele African Jour Eco.pdf (705.1Kb) -
Nsinamwa, M.; Sebego, R.J. (Botswana College of Agriculture, http://www.bca.bw/Research/bojaasBca/InstructionToAuthors.htm, NaN, 2007)[more][less]
Abstract: Grasses and forbs in Southern Africa have been understudied in terms of species richness and factor that affect diversity patterns. To gain a better understanding of factors affecting patterns of herbaceous plant species seedbank around water points, six boreholes ( three in each land zone) were randomly selected for sampling. Top soil layers of 20cm depth were sampled from six boreholes at distances of 50, 100, 200, 400, 800, 1500, and 3000m ( the Piosphere approach) in fenced and unfenced plots to determine the density and composition of the seedbank. The samples were allowed to germinate in the growth tray (10 x 15 x 8cm³) under controlled conditions (temperature, moisture) in a green house followed by daily counting of seedlings. Herbaceous plant species diversity was analyzed by using Simpson's diversity index. Analysis of varience on herbaceous species diversity was determined using the SAS software. Herbaceous plant community clustering was determined by using TWINSPAN, a FORTRAN programme. Significant (p=0.0001) germination variants were observed along the distance from livestock watering points. Most grass seedlings recorded germinated from soil samples obtained from from fenced plots, while less than 40% of the forb seedlings were. Most of the forbs species were recorded within 400m from the water points and that soils closer to water points also contained grass seeds despite the level of degradation and /or trampling. URI: http://hdl.handle.net/10311/313 Files in this item: 1
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Aghdasi, F.; Bhasin, A. (University of Botswana, NaN, 2004)[more][less]
Abstract: Asynchronous sequential circuits offer improved speed of operation when compared to their synchronous counterparts. However, the standard methods of asynchronous design require careful examination of the flow table for possible critical races and hazards. This complicates the design procedure and often leads to extra states and additional hardware. A number of new design methodologies which involve locally generating a clock and using it to self synchronize the machine have been proposed. Such clock signals are generated wherever an input changes, or by controlled excitation whenever a change of inputs necessitates a change of state. All such designs, where the circuit is timed by locally generated clocks, are called Self-Clocked Sequential Circuits. This paper uses a design methodology for the State variable toggling through data driven clocks to implement a Direct Memory Access Controller (DMAC) as a design example. The design is simulated on software and also implemented using discrete hardware components. The methodology can be extended to parallel controllers for neutral networks and automated using state assignment techniques already for synchronous parallel controllers. URI: http://hdl.handle.net/10311/648 Files in this item: 1
Aghdasi_BJT_2004.pdf (1.145Mb) -
Lumande, E.; Ojedokun, A.A.; Lebotse, E.K.; Mbangiwa, A.M. (Emerald/www.emeraldinsight.com, NaN, 2000)[more][less]
Abstract: Inconsistency and/or a lack of a clear understanding of the criteria for serial selection and evaluation have been observed to characterise the presentation of requests for approval of serials at the University of Botswana Library (UBL). This, on a number of occasions, has made decision taking difficult and sometimes inconclusive. The paper provides a case study of the examination of guidelines in use in other academic libraries. It also describes the process and procedure currently in use at the UBL. The study identified some anomalies and suggests modifications to ensure consistency in the presentation of submissions to guide better decision making by the Serials Selection Committee of the Library. URI: http://hdl.handle.net/10311/873 Files in this item: 1
Lumande_LM_2000.pdf (808.7Kb) -
Laletsang, K.; Modisi, M.P.; Shemang, E.M.; Moffat, L.; Moagi, O.R. (Elsevier www.elsevier.com/locate/jafrearsci, NaN, 2007)[more][less]
Abstract: A seismic refraction analysis was carried out on data acquired on an 8.5 km profile at Lake Ngami, NW Botswana, to determine the structure and stratigraphy underlying the lake. The seismic spread comprised a 48-channel seismograph with a 9.5 m receiver and source spacing. The seismic source comprised 10 hammer blows on an aluminum plate, from which a vertical stack was recorded. The data were processed with WinSismTM version 10 program using the intercept time method. A total field magnetic survey was also carried out along the same line. The seismic refraction profile shows a low velocity layer (400–1600 m/s) extending from the surface at the southern end of the line to a maximum depth of 30 m in the middle of the profile, returning to a depth of 20 m from 4.5 km to the northern end of the line. The low velocity layer consists of the unconsolidated sediments and is underlain by more compact and saturated material with seismic velocities of 1600–3600 m/s. This material is interpreted to comprise semi- to fully consolidated sandstone. The base of these sandstones, however, could only be mapped near the southern end of the line out to 2 km. High seismic velocity rocks (3600–5000 m/s), interpreted to be weathered to fresh basement, were mapped below the sandstones at the southern end of the line. The magnetic profile shows a high at the beginning of the line which progressively declines to a low at 3 km. The field strength increases rapidly over the next 1.5 km to reach a plateau level at 4.5 km. The magnetic high at the beginning of the line corresponds to shallow basement which is mapped in the refraction profile. The magnetic low at 3 km is indicative of a thickened sediment section at this location. The southern end of the line with high seismic velocities comprises basement rocks located in the footwall block of the Kunyere Border Fault of the Okavango Rift. The step-wise downthrown hanging wall block consists of the low to intermediate velocity basin deposits in the northern part of the profile. URI: http://hdl.handle.net/10311/376 Files in this item: 1
Modisi2007ShallowSeismic.pdf (656.3Kb) -
Togarasei, L. (Edinburgh University Press, http://www.euppublishing.com/, NaN, 2009)[more][less]
Abstract: The article discusses the politics of bible translation focusing on the Shona Bible. Specifically it looks at the translation of the word 'banquetings' into 'mabira' in the Union Shona Bible, the first complete translation of the Shona Bible. It also discusses the history of the translation of the Bible from the time the missionaries arrived among the Shona peoples in the 1890s to the time when the first complete Bible was translated into the Shona language in the late 1940s. It discusses the political and cultural factors that influenced the way the Bible was translated. How did missionaries’ understanding of the Shona worldview influence their translation? How did the translators address the dialectical differences in the Shona language considering that it has five dialects? How did Shona cosmology and spirituality influence translation? To answer these and other questions concerning the politics behind biblical translation, specific biblical examples (here the translation of ‘banquetings’ into mabira in 1 Peter 4:3) are analysed. The article also briefly looks at subsequent ‘improvements’ to the Shona Bible to see how translators have responded to cultural and linguistic changes over the years in their use of the bible among the Shona. URI: http://hdl.handle.net/10311/596 Files in this item: 1
Togarasei_SWC_2009.pdf (112.8Kb) -
Maruapula, S.D.; Jackson, J.C.; Holsten, J.; Shaibu, S.; Malete, L.; Wrotniak, B.; Ratcliffe, S.J.; Mokone, G.G.; Stettler, N.; Compher, C. (PHN, http://journals.cambridge.org/action/displayJournal?jid=phn, August NaN, 2011)[more][less]
Abstract: Objective: To describe patterns of food consumption associated with overweight\obesity (OW/OB) and their links to socio-economic status (SES) and urbanization. Design: A nationwide cross-sectional survey. Setting: Secondary schools in cities, towns and villages in Botswana, Africa. Subjects: A total of 746 adolescent schoolchildren. Results: OW/OB is associated with greater SES, city residence and a snack-food diet pattern. Students belonging to higher SES compared with those from a lower SES background reported significantly (P,0?01) more daily servings of snack foods (1?55 v. 0?76) and fewer servings of traditional diet foods (0?99 v. 1?68) and also reported that they ate meals outside the home more often (90% v. 72 %). Students in cities ate significantly (P,0?01) more servings of snacks (1?69 v. 1?05 v. 0?51) and fewer servings of traditional foods (0?67 v. 1?52 v. 1?61) compared with those in urban and rural villages. The odds of OW/OB were increased 1?16-fold with a snack-food diet, a result that was diminished when controlled for SES. Conclusions: These data suggest that nutritional transition occurs at different rates across urbanization and SES levels in Botswana. In cities, increasing the availability of fruit while reducing access to or portion sizes of snack items is important. Emphasis on continued intake of traditional foods may also be helpful as rural areas undergo economic and infrastructural development. URI: http://hdl.handle.net/10311/1137 Files in this item: 1
Maruapula_PHN_2011.pdf (112.3Kb) -
Magole, L. (http://www.routledge.com/, NaN, 2009)[more][less]
Abstract: This paper analyses land management policy using land use mapping, interviews with farmers and other stakeholders, and a review of secondary material. The study was carried out in the Lake Ngami area of Ngamiland District in Botswana. It found that the net effect of policy and development initiatives implemented to curb perceived overstocking, overgrazing, open access tenure and low-output subsistence production was to narrow down the livelihood options for the rural poor and cause further damage to the rangeland. Policy-makers ignored the multi-purpose land use systems and goals of traditional pastoral systems, and emphasised commercialisation of livestock farming and privatisation of communal land. This unfortunately weakened or destroyed the local, traditional land management institutions and set in motion the shrinking of the commons. These policies are a colonial legacy that has survived the transitions from colonial rule to independence. URI: http://hdl.handle.net/10311/807 Files in this item: 1
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Mladenov, N.; McKnight, D.M.; Wolski, P.; Murray-Hudson, M. (Elsevier, www.elsevier.com/locate/ecolmodel, NaN, 2007)[more][less]
Abstract: In order to examine dissolved organic matter (DOM) fluxes in seasonal wetland systems that expand and contract seasonally, a time-variable model of dissolved organic carbon (DOC) was developed for a seasonal floodplain in the Okavango Delta of Botswana. The model simulates DOC concentrations from March 2001 to November 2002, during which time DOC concentrations varied between 8 and 31mgCL−1. The model uses a continuously stirred tank reactor (CSTR) approach to describe the hydrologic and biogeochemical controls on DOC leached from litter within the floodplain and transported into the floodplain from upstream. In 2002, a fire burned the floodplain and less litter was available for leaching than in 2001. The model was driven by observations of discharge, water temperature, upstream DOC concentrations, and DOC leaching rates from leaching experiments. Leaching experiments with sedges and grasses indicated that on average 23mgDOCg−1 were leached during the first day ofwetting and 0.6mgDOCg−1 d−1 were continuously leached afterwards. Leaching experiments also showed a decreased amount of DOC released from burned litter and soils than from unburned litter and soils. A two-pool first-order decaymodel that represents both rapidly (0.14 d−1 (at 22 ◦C)) and slowly (0.045 d−1) decaying pools of DOC provided the best representation of observed patterns in DOC concentration in 2001. The decay rate of the first pool decreased by nearly half in 2002, when an estimated 78% of litter was removed by fire. Upstream DOC transport into the floodplain was the dominant source of DOC (representing approximately 70% and 75% of the DOC input in 2001 and 2002, respectively), followed by DOC leaching from litter and DOC originating from microbial sources. In 2001, decomposition (representing approximately 36% of the DOC loss), outflow to an adjacent floodplain (36%) and infiltration (28%) were the major removal mechanisms for DOM from the study floodplain. The large amount of DOC transported by infiltration implies storage of DOC in the subsurface, whichmay influence subsurface heterotrophic activity. In light of future climate change anticipated for the region, a scenario using a 2 ◦C increase in average water temperature and 10% reduction in upstream DOC mass was performed and resulted in significant (11%) reduction in annual DOC mass within the study floodplain. URI: http://hdl.handle.net/10311/497 Files in this item: 1
Mladenov2007Simulation.pdf (2.048Mb) -
Masale, M. (Elsevier Science Ltd. http://www.elsevier.com/locate/physb, NaN, 2004)[more][less]
Abstract: The energy spectrum of an electron confined near a current-carrying core is obtained as a function of the azimuthal applied magnetic field within the effective-mass approximation. The double degeneracy of the non-zero electron's axial wave number (kz) states is lifted by the current-induced magnetic field while that of the non-zero azimuthal quantum number (m) states is preserved. A further analysis is the evaluations of the oscillator strengths for optical transitions involving the lowest-order pair of the electron's energy subbands within the dipole approximation. The radiation field is taken as that of elliptically polarized light incident along the core axis. In this polarization and within the dipole approximation, the allowed transitions are only those governed by the following specific selection rules. The azimuthal quantum numbers of the initial and final states must differ by unity while the electron's axial wave number is conserved. The azimuthal magnetic field is also found to lift the multiple degeneracies of the kz=0 interaction integrals as well as those of the oscillator strengths for optical transitions. URI: http://hdl.handle.net/10311/244 Files in this item: 2
license.txt (1.998Kb)Masale_PB_2004.pdf (1.197Mb) -
Iwisi, D.S.; Kitindi, E.G.; Basson, N. (Emerald Group Publications, www.emeraldinsight.com, NaN, 2007)[more][less]
Abstract: Auditing lends credibility to financial statements of enterprises. The Southern African Development Community (SADC) has committed itself to the promotion of small businesses in member countries. This implies that auditors will become more involved with small businesses as a result of their expected growth and expansion. However, small businesses are said to have characteristics that cause difficulties to their auditors. This study investigates the characteristics of small businesses in three SADC countries, problems auditors of small businesses in those countries face, frequency of occurrence of those problems, and their impact on auditing. The findings suggest that characteristics of small businesses in the selected SADC countries are similar to those of small businesses in other countries. Many of twenty-three problems suggested to auditors rarely occured, or occurred only occassionally. However, some problems are considered to have an important effect on auditing. URI: http://hdl.handle.net/10311/1060 Files in this item: 1
IWISI_ARA_2002.pdf (1.365Mb)