Browsing Faculty of Natural and Agricultural Sciences by Issue Date
Now showing items 1-20 of 4854
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Die verbond – van Ou Testament na Nuwe Testament
(AOSIS, 1983)Die verbondsbegrip het in die Ou Testamentiese wetenskap weer ’n plek gekry op grond van die werk van Eichrodt en die studie van ooreenkomste tussen die verbond in die Ou Testament en die buite-Bybelse staatsverdrae, sedert ... -
Die persoonlike geloofsdaad van die nagmaalsgebruiker
(AOSIS, 1990)The act of personal faith of the Communicant The aim of this article is to determine the nature of the communicant’s act of faith in the Three Formulae of Unity. The main theses are: • Holy communion is only instituted ... -
Separation and recovery of some platinum group metals (PGMs) by means of selective photocatalytic reduction
(SAIMM, 1995)The historical development of public service commissions in South Africa had been a process that formed part of the administration of the country since Unification in 1910. Although public service commissions existed in ... -
The reduction of hexavalent chromium by sulphite in wastewater
(WRC, 1999)The reduction of hexavalent chromium, Cr(VI), in unbuffered aqueous solution by sulphite was investigated as a function of pH, possible dosage and contact time required to reach equilibrium. Dissolved Na2Cr2O7.2H2O served ... -
Nickel retention by goethite and hematite.
(Elsevier, 2000)The association of nickel with goethite and hematite is of importance for various processes concerned with nickel extraction. The adsorption of Ni2+(aq) by goethite and hematite in aqueous solutions were investigated ... -
Technical note. Cr(VI) generation during milling.
(Elsevier, 2001)An investigation of the dry milling of chromite at a ferroalloy producer revealed high Cr(VI) concentrations in the milled ore. This promted further investigation into the possible generation of Cr(VI) during milling. ... -
Spectral constraints for millisecond pulsars due to general relativistic frame dragging
(Springer, 2005)We develop a numerical code for simulating the magnetospheres of millisecond pulsars, which are expected to have unscreened electric potentials due to the lack of magnetic pair production. We incorporate General Relativistic ... -
Gamma‐ray pulsar visibility
(AIP, 2005)PSR J0437‐4715 is a millisecond pulsar (MSP) thought to be “pair formation starved” (having limited pair cascades due to magnetic photon absorption). Fortunately the general relativistic (GR) electrodynamical model under ... -
Empirical constraints on the general relativistic electric field associated with PSR J0437-4715
(IOP Publishing, 2005)We simulate the magnetosphere of the nearby millisecond pulsar PSR J0437-4715, which is expected to have an unscreened electric potential due to the lack of magnetic pair production. We incorporate general relativistic ... -
Value-focused assessment of information communication and technology security awareness in an academic environment
(Springer, 2006)The aim of this paper is to introduce the approach of value-focused thinking when identifying information and communications technology (ICT) security awareness aspects. Security awareness is important to reduce human ... -
Computational methods for the determination of roundness of sedimentary particles
(Springer, 2006)A number of subjective and objective methods have been proposed to determine the roundness of rock particles, roundness being one of three properties describing the shape of a particle. Methods that make use of the Fourier ... -
Direct synthesis of a titania membrane on a centrifugally casted tubular ceramic support
(Elsevier, 2006)In-house manufactured tubular ceramic supports prepared by centrifugal casting have a smooth inside surface and are ideal for thin defect-free coatings. The aim of this study was to directly coat a thin defect-free titania ... -
Experimental and DFT investigation of the 1-octene metathesis reaction mechanism with the Grubbs 1 precatalyst
(Elsevier, 2006)Using density functional theory the metathesis reactions of 1-octene in the presence of Grubbs 1 [RuCl2(PCy3)2( CHPh)] is investigated. At the GGA-PW91/DNP level, the complete geometry optimization and the activation ... -
Urban environmental policy in Africa: the real story
(Edward Elgar Publishing, 2007) -
Policy responses at the local sphere of government: complexities and diversity
(Edward Elgar Publishing, 2007) -
Email security awareness: a practical assessment of employee behaviour
(Springer, 2007)Email communication is growing as a main method for individuals and organizations to communicate. Sadly, this is also an emerging means of conducting crime in the cyber world, e.g. identity theft, virus attacks etc. ... -
Value-focused assessment of ICT security awareness in an academic environment
(Elsevier, 2007)Security awareness is important to reduce human error, theft, fraud, and misuse of computer assets. A strong ICT security culture cannot develop and grow in a company without awareness programmes. This paper focuses on ICT ... -
Identity theft: empirical evidence from a phishing exercise
(Springer, 2007)Identity theft is an emerging threat in our networked world and more individuals and companies fall victim to this type of fraud. User training is an important part of ICT security awareness; however, IT management ... -
Complexation of palladium(II) with chloride and hydroxide
(Taylor & Francis, 2007)Complex formation of Pd(II) with chloride and hydroxide has been investigated by spectrophotometry at 25°C and ionic strength 1.0 M. For the chloride complexes [PdCl n (H2O)4− n ]2− n (n = 0–4), the formation constants, β ... -
An introduction to realized volatility
(Taylor & Francis, 2007)Financial market volatility is central to the theory and practice of asset pricing, option pricing, asset allocation, portfolio selection, portfolio rebalancing and various risk management applications. Although financial ...
