88 research outputs found
Information from 2006, 2010 and 2011 for the Karnmelkspruit Cape Vulture Gyps coprotheres colony, Lady Grey district, Eastern Cape Province, South Africa
No full textThe Cape Vulture (Gyps coprotheres), a southern African endemic, is listed asa threatened species (‘Vulnerable’) in southern Africa (Barnes 2000) and globally (IUCN 2012). Information relating to the structure, size, breeding status and conservation of a Cape Vulture colony (at 30° 50´S; 27° 14´E) in the Karnmelkspruit Gorge in the Lady Grey district in the north-eastern region of South Africa’s Eastern Cape Province, is available in the literature (Boshoff & Vernon 1979, 1980; Vernon et al. 1983; Vernon 1984, Boshoff & Vernon 1987; Boshoff 1990). This note provides additional information, obtained during three visits to the colony by the author
Internationally linked authors in Uganda, East Africa : an example of author-level bibliometrics for a developing country
No full textCITATION: Boshoff, N., Basaza-Ejiri, H. A. D. & Tise, E. R. 2018. Internationally linked authors in Uganda, East Africa : an example of author-level bibliometrics for a developing country. In STI 2018 Conference Proceedings, 23rd International Conference on Science and Technology Indicators, 12-14 September 2018, Leiden, Netherlands.The original publication is available at http://sti2018.cwts.nl/proceedingsIn developing countries, researchers with strong international links potentially act as a double-edge sword. On the one hand, local researchers with international links could strengthen the research base of an institution or country while, on the other hand, they could leave the research base vulnerable should they migrate. The study identified internationally linked authors in Uganda, East Africa, by applying individual-level bibliometrics to a dataset of 3,948 Ugandan authors from the Web of Science, for the period 2011–2015. The focus was on four overlapping groups of internationally linked authors: (1) Ugandan authors with an international co-author, (2) Uganda authors with a joint international affiliation, (3) Ugandan authors affiliated with an international organisation that has a local address, and (4) Ugandan authors affiliated with an international research partnership. The study showed that without the identified forms of international linkages, the Ugandan scholarly workforce would reduce to 14% of its current size. Moreover, 74% of Ugandan authors without any international links had co-authored articles with Ugandan authors who are linked internationally. Although the extent of both international and national mobility associated with internationally linked authors seem low, benchmarking against comparative figures for other countries in sub-Saharan Africa is required.http://sti2018.cwts.nl/proceedingsPublisher's versio
X-Ray Micro Tomography of Water Absorption by Superabsorbent Polymers in Mortar
No full textSuperabsorbent Polymers (SAP) have been recently subject of investigation as smart admixtures for cement-based materials. The properties of these polymers enable their use for internal curing, increasing freeze/thaw resistance, boosting autogenous self-healing and providing a crack self-sealing effect in cementitious composites. Except for the earliest application, the functioning of these beneficial effects invloves the absorption by the polymers of ingress water in the hardened cementitious matrix and later release, as well as their capacity to complete multiple absorption/desorption cycles. In this work, the absorption of water in mortar with superabsorbent polymers is monitored during the first 60 min of absorption through micro-CT. The experimental series included the presence of cracks. The registration and differentiation of sub-minute (18 s) scans enabled the individuation of bulk water content distribution in the mortar with a resolution of 55 μm. The swollen volume of SAP could also be quantified and studied in time. The results point out that although embedded SAP absorb water from the matrix, this absorption is slow and reduced with respect to water absorption during mixing for the used SAP. Same effect is observed for SAP in the cracks.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and Environmen
Book reviews: Historical Incidence of the Larger Land Mammals in the Broader Eastern Cape
No full textBook Title: Historical Incidence of the Larger Land Mammals in the Broader Eastern Cape, 2nd edn, Book Author: C.J. Skead:Book Editors: A.F. Boshoff, G.I.H Kerley and P.H. Lloyd. Centre for African Conservation Ecology, Nelson Mandela Metropolitan University Port Elizabeth. 2007. Price R490. ISBN 1 920176 08 X
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