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Search Results: 1 - 10 of 407740 matches for " W.P.D. Gertenbach "
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A Cursory Review of the Climate and Vegetation of the Kruger National Park
F.J. Venter,W.P.D. Gertenbach
Koedoe : African Protected Area Conservation and Science , 1986, DOI: 10.4102/koedoe.v29i1.526
Abstract: The main features of climate and vegetation of the Kruger National Park are discussed. The dry tropical climate induced lush deciduous savannas with a great variety of species and diverse vegetation structures. Variations in species composition and structural features are mainly regulated by soil type and fire regime.
A List of Alien Plants in the Kruger National Park
I.A.W. Macdonald,W.P.D. Gertenbach
Koedoe : African Protected Area Conservation and Science , 1988, DOI: 10.4102/koedoe.v31i1.491
Abstract: The alien vascular plant flora of the Kruger National Park is listed. Annotations cover the invasive status, modes of introduction and dispersal, dates of first recording, ecological impacts and control status of each species. The list comprises 156 species of which 113 are considered invasive within the park. Most of the species have been accidentally introduced to the park. The ecological impacts of 27 species (of which 11 are trees and shrubs) were rated as moderate or high. By 1985 only 10 species are thought to have been eradicated from the park. Most of the invasive species are herbaceous weeds of man-disturbed sites and the eradication of these is generally considered impossible. Most of the important species are dispersed by water and animals. The significance of limiting reinvasion of the park down the rivers flowing into the park, is stressed.
A phytosociological classification of the Hlane Wildlife Sanctuary, Swaziland
W.P.D. Gertenbach,A.L.F. Potgieter
Koedoe : African Protected Area Conservation and Science , 1978, DOI: 10.4102/koedoe.v21i1.960
Abstract: A phytosociological classification of the vegetation of the Hiane Wildlife Sanctuary was undertaken, with special reference to the vegetation structure and the correlation between plant communities and the biotic and abiotic environment. This study contributes to the drafting of a management plan for the sanctuary.
Plant communities and landscapes of the Parque Nacional do Limpopo, Mo ambique
M. Stalmans,W.P.D. Gertenbach,Filipa Carvalho-Serfontein
Koedoe : African Protected Area Conservation and Science , 2004, DOI: 10.4102/koedoe.v47i2.83
Abstract: The Parque Nacional do Limpopo (PNL) was proclaimed during 2002. It covers 1 000 000 ha in Mo ambique on the eastern boundary of the Kruger National Park (KNP) and forms one of the major components of the Great Limpopo Transfrontier Park. A vegetation map was required as one of the essential building blocks for the drafting of its management plan (Grossman & Holden 2002).
Diameter dependence of tensile strength by Weibull analysis: Part III sisal fiber
Inacio, W.P.;Lopes, F.P.D.;Monteiro, S.N.;
Matéria (Rio de Janeiro) , 2010, DOI: 10.1590/S1517-70762010000200006
Abstract: environmental aspects and economical advantages are motivating the use of natural fiber as reinforcement of polymer composites in substitution for synthetic fiber composites such as fiber glass. in particular, the sisal fiber is one of the most investigated and being used in engineering systems. by contrast to synthetic fibers, natural fibers have the disadvantage of being heterogeneous in their dimensions specially the diameter. in several natural fibers it has been found that the smaller the diameter, the stronger is the fiber. in this work a weibull analysis of sisal fibers tensile strength was performed to find a correlation with the diameter. the results revealed an inverse dependence of the tensile strength with the diameter. the observation of ruptured fibers by scanning electron microscopy suggested possible mechanisms that justify a hyperbolic correlation.
TCABR interferometer
Elizondo, J.I.;Korneev, D.;Nascimento, I.C.;Sá, W.P. de;
Brazilian Journal of Physics , 2002, DOI: 10.1590/S0103-97332002000100023
Abstract: the microwave interferometer of the tcabr tokamak is presented in this paper, describing in some detail the phase detection procedure and other technical features. the system has three transceivers and seven waveguide channels coupled to horn antennas. the operating frequency, 140 ghz, allows measuring the electronic density of the tcabr plasmas avoiding cutoff and with relatively small refraction effects. the high intermediate frequency, 18 mhz, together with the large pass-band lter and heterodyne detection system allows measuring fast density changes without loss of signal. some experimental results and calculations are presented.
TCABR interferometer
Elizondo J.I.,Korneev D.,Nascimento I.C.,W.P. de
Brazilian Journal of Physics , 2002,
Abstract: The microwave interferometer of the TCABR tokamak is presented in this paper, describing in some detail the phase detection procedure and other technical features. The system has three transceivers and seven waveguide channels coupled to horn antennas. The operating frequency, 140 GHz, allows measuring the electronic density of the TCABR plasmas avoiding cutoff and with relatively small refraction effects. The high intermediate frequency, 18 MHz, together with the large pass-band lter and heterodyne detection system allows measuring fast density changes without loss of signal. Some experimental results and calculations are presented.
Le plaisir de se voir digitalis . Toespraak bij de lancering van neerlandistiek.nl op 14 juni 2001.
Gerritsen, W.P.
Neerlandistiek.nl , 2001,
Abstract:
SOME MEDICAL IMPRESSIONS OF ABYSSINIA
W.P. Steenkamp
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/4-3-916
Abstract: Before going into the proper matter of this paper it might not be out of place to say a few things about Abyssinia generally.That area of greater Ethiopia conquered by the Italians in their 1935 Campaign comprises roughly 350 000 square miles and can be considered the Jewel of Northern Africa - bounded as it is on one side by the flat desert-like country of Italian Somaliland and on the other by the bleak, desolate and inhospitable mountains of Eritrea. Small wonder therefore that the Italians for years had an eye on Abyssinia which for hundreds of miles on end consists of green mountains and rolling valleys covered with grass, generally presenting scenery which in some spots surpasses Switzerland and the Grand Canyon of Colorado.
Tidal flares and rates from an archival cluster survey
Maksym W.P.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123905002
Abstract: Tidal disruption flares (TDFs) are potent indicators of the co-evolution of galaxies and the massive black holes (MBHs) which they host in their nuclei, both in terms of the individual black holes revealed by tidal flares and in terms of the overall disruption rate. We examine key concerns regarding the disruption rate from an observational perspective. We also present the findings to date of an archival survey of galaxy clusters using X-ray variability selection and multi-wavelength follow-up. We present a disruption rate that is consistent with other observational and theoretical findings to date, as well as two noteworthy X-ray flares which we attribute to tidal disruption events.
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