Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1993-2012 of 4825
-
Gomphocarpus glaucophyllus
(SANBI, 2017)The genus Gomphocarpus R.Br. is a relative small genus from the Apocynaceae (sub - family Asclepiadoideae) that is naturally found in mostly arid parts of eastern and southern Africa, extending into the Arabian ... -
Gomphonema grande sp. nov., a new diatom (Bacillariophyta) from the Democratic Republic of the Congo, Tropical Africa
(Magnolia Press, 2016)Gomphonema grande sp. nov. is described from a single sample collected from the Congo River Basin, Tropical Africa. The morphological features of the new species are described and documented through light microscopy and ... -
The good, the bad and the ugly of South African fatal road accidents
(ASSAf, 2018)We reflect on the good, the bad and the ugly of the fatal accidents occurring on South Africa’s roads. The cost of human lives indisputably equates to ‘the ugly’ and the economic cost of accidents associates with ‘the bad’. ... -
The good, the bad and the ugly: using videos to reverse systems analysis and design instruction
(IEEE, 2013)Systems Analysis and Design (SAD) is a second-year subject offered within the Information Technology (IT) course at the Vaal Triangle Campus of the North-West University in South Africa. The diverse environment of this ... -
Goodness-of-fit tests for multivariate stable distributions based on the empirical characteristic function
(Elsevier, 2015)We consider goodness-of-fit testing for multivariate stable distributions. The proposed test statistics exploit a characterizing property of the characteristic function of these distributions and are consistent under ... -
Goodness-of-fit tests for parametric specifications of conditionally heteroscedastic models
(Springer, 2020)We consider a goodness-of-fit test for certain parametrizations of conditionally heteroscedastic time series with unobserved components. Our test is quite general in that it can be employed to validate any given specification ... -
Goodness-of-fit tests for semiparametric and parametric hypotheses based on the probability weighted empirical characteristic function
(Springer, 2016)We investigate the finite-sample properties of certain procedures which employ the novel notion of the probability weighted empirical characteristic function. The procedures considered are: (1) Testing for symmetry in ... -
Goodness-of-fit tests in conditional duration models
(Springer, 2020)We propose specification tests for the innovation distribution in conditional duration models. The new tests are based either on the cumulative distribution function, or on exponential transforms such as the Laplace transform ... -
Goodness-of-fit tests in the Cox proportional hazards model
(Taylor & Francis, 2019)We consider a variety of tests for testing goodness-of-fit in a parametric Cox proportional hazards (PH) model and compare their performance. Aspects of the model under test include the baseline distribution and time-invariance ... -
Government funding framework for South African Higher Education Institutions
(Higher Education South Africa (HESA), 2015)Since the early 1950s, only four funding formulate have been used for public funding of higher education institutions in South Africa. From the introduction of the Holloway formula in 1953 to the current New Funding Framework ... -
Granulites, CO2 and graphite
(Elsevier, 2012)Externally derived, pure CO2 that mixes with a carbon-(under)saturated C-O-H-fluid in lower crustal granulites may result in graphite precipitation if the host-rock oxygen fugacity (fO2rock) is below the upper fO2 limit ... -
Graphs with sparsity order at most two: the complex case
(Taylor & Francis, 2017)The sparsity order of a (simple undirected) graph is the highest possible rank (over or ) of the extremal elements in the matrix cone that consists of positive semidefinite matrices with prescribed zeros on the positions ... -
Grass abundance maintains positive plant–arthropod diversity relationships in maize fields and margins in South Africa
(Wiley, 2017)The large-scale cultivation of crops may lead to biodiversity decreases as a result of habitat loss and degradation of natural habitats. A popular strategy for enhancing insect diversity in intensively cultivated habitats ... -
Gravimetry and its application to geohydrology: a review
(CONSAS Conference, 2016)The application of gravity to Geohydrology is reviewed. A short background and history related to the application of geophysics to Geohydrology is outlined. Multiple works related to ground based gravimetry applied to the ... -
Gravitational light-bending prevents γγ absorption in gravitational lenses
(EDP Sciences, 2016)The magnification effect that is due to gravitational lensing enhances the chances of detecting moderate-redshift (z ~ 1) sources in very high-energy (VHE; E > 100 GeV) γ-rays by ground-based atmospheric Cherenkov telescope ... -
GRB observations with H.E.S.S.
(Sissa Medialab, 2019)Fermi-LAT observations have proven that GeV γ-ray emission is a relatively common feature for many Gamma Ray Bursts (GRB). However the low effective area of space detectors implies low statistics for high-energy photons ... -
GRB observations with H.E.S.S. II
(PoS, 2017)The High Energy Stereoscopic System (H.E.S.S.) has been searching for counterparts of Gamma Ray Bursts (GRBs) for many years. In 2012 the system was upgraded with a fifth 28m diameter telescope (CT5) which is equipped ... -
Green arbitrated synthesis of Fe3O4 magnetic nanoparticles with nanorod structure from pomegranate leaves and Congo red dye degradation studies for water treatment
(Elsevier, 2017)An efficient, cost effective and eco-friendly approach has been developed for the synthesis of Fe3O4 magnetic nanorods (MNRs) using aqueous extract of Pomegranate leaves (PG). The synthesized PG-Fe3O4 MNRs were characterized ... -
Green place-making in practice: from temporary spaces to permanent places
(Taylor & Francis, 2015)Current spatial planning and sustainability approaches attempt to create competitive, lively and sustainable cities. This paper argues that place-making approaches and green-planning approaches can assist in this regard ...