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Now showing items 11-20 of 24
An efficient synthesis of flavans from salicylaldehyde and acetophenone derivatives
(Elsevier Science Ltd, http://www.elsevier.com/locate/tetlet, 2011)
An efficient total synthesis of flavans from the reactions of salicylaldehyde and acetophenone derivatives is reported. The synthesis involves preparation of chalcones through an aldol reaction followed by reduction of ...
Natural attenuation of mining pollutants in the transboundary Save River
(Elsevier Science Ltd, http://www.elsevier.com/locate/pce, 2011)
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 ...
Minerals that host metals at Dorowa Rock Phosphate Mine, Zimbabwe
(Bentham Open, http://www.benthamscience.com/open/tomj/index.htm, 2011)
This study set out to establish the major minerals at Dorowa and determine which of those are likely to host metals that may leach into surface and groundwater. This study comes after a preliminary assessment of the water ...
Using merkle tree to mitigate cooperative black-hole attack in Wireless Mesh Networks
(The Science and Information Organization Inc., www.ijacsa.thesai.org, 2011)
Security is always a major concern and a topic of hot discussion to users of Wireless Mesh Networks (WMNs). The open architecture of WMNs makes it very easy for malicious attackers to exploit the loopholes in the routing ...
Computing knowledge and skills demand: A content analysis of job adverts in Botswana
(The Science and Information Organization, http://thesai.org/Publication/Default.aspx, 2011)
This paper presents the results of a content analysis of
computing job adverts to assess the types of skills required by
employers in Botswana. Through the study of job adverts for
computing professionals for one year ...
A tag-like, linked navigation approach for retrieval and discovery of desktop documents
(Springer, www.springer.com, 2011)
Computer systems provide users with abilities to create, organize, store and access information. Most of this information is in the form of documents in files organized in the hierarchical folder structures provided by ...
Development of Callosobruchus maculatus (F.) on some pulses in Botswana
(Applied Zoologists Research Association (AZRA), http://www.azra-india.com/journal.html, 2011)
Some aspects of the biology of Callosobruchus maculatus (F.) were studied on seven pulses viz., Cowpea (5 varieties), Bambara groundnut, Mung bean, Pigeonpea, Lablab, Soya bean and Kidney bean, under ambient laboratory ...
Analysis of persistence soil nutrient statusin abandoned cattle kraals in a semi arid area of Botswana
(Academic Journals, http://www.academicjournals.org, 2011-12-04)
The aim of this study was to analyze the depletion of soil nutrients with time on abandoned kraals in a peri-urban area of Botswana. Active kraals are enriched with nutrients through the accumulation of animal droppings ...
Analyzing the load balance of term-based partitioning
(The Science and Information Organization Inc., http://ijacsa.thesai.org/, 2011)
In parallel (IR) systems, where a large-scale collection
is indexed and searched, the query response time is limited by the
time of the slowest node in the system. Thus distributing the load equally across the nodes is ...
Vector measures of bounded semivariation and associated convolution operators
(Glasgow Mathematical Journal Trust, http://journals.cambridge.org/action/displayJournal?jid=GMJ, 2011)
Let G be a compact metrizable abelian group, and let X be a Banach space. We characterize convolution operators associated with a regular Borel X-valued measure of bounded semivariation that are compact (resp; weakly ...