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Now showing items 1-20 of 510

Nuclear scattering in the random phase approximation

Lemmer R.H.; Veneroni M. (1968)

A simple extension of the random phase approximation (RPA) is described that includes scattering channels of a single nucleon. Coupled equations are derived for the single-nucleon amplitudes that describe the scattering ...
Use of a truncated Hilbert space in nuclear reaction calculations

Hufner J.; Lemmer R.H. (1968)

This formulation of nuclear reaction calculations stays as close as possible to the usual bound-state shell-model calculations. The Hilbert space used in the bound-state calculations is enlarged by adding the scattering ...
Retarded interactions in fermi systems. II. Quasiparticle lifetimes

Dover C.B.; Lemmer R.H. (1969)

Properties of the inverse lifetime 1 of quasiparticles in an infinite system of nucleons ("nuclear matter") interacting via the exchange of a neutral scalar boson are studied in the dielectric formulation of the many-body ...
The Manifestation of Religious Commitment with Regard to Divergent Reality Definitions

Coetzee J.K. (1978)

[No abstract available]
Urban early adolescents, crowding and the neighbourhood experience: A preliminary investigation

Van Staden F.J. (1984)

This interview study focused on urban early adolescents' conscious experiences of high density conditions. Thirty children residing in apartments in two boroughs of New York City (Brooklyn and Manhattan), participated in ...
The prediction of the performance of simple catalytic reactors for Fischer-Tropsch type catalytic polymerization reactions

Green J.C.A.; Jager B. (1985)

Kinetic equations based on the Schultz-Flory theory and simple power law kinetics for the product distributions are used in a special class of catalytic polymerization reactions of which Fischer-Tropsch reactions form a ...
Deuteron on deuteron break-up in regions characterized by competing mechanisms

Mdlalose T.E.; Fiedeldey H.; Sandhas W. (1988)

Previous calculations of the reaction 2H(d, nd)1H, performed in the quasi-free scattering (QFS) region by means of the four-body AGS formalism, are extended to kinematical situations, where final state interaction (FSI) ...
Proton-induced break-up of 3He at 35MeV

Slaus I.; Epstein M.B.; Mdlalose T.E.; Fiedeldey H.; Sandhas W. (1990)

The reactions 3He + p → d + p + p, and 3He + p → p + p + p + n have been studied at 35MeV. These reactions are dominated by quasi-two-body processes: pp and pd quasi-free scattering, pp final-state interactions, and neutron ...
The detection of a change point in periodic gamma ray data

Lombard F.; de Jager O.C.; Schultz D.M. (1990)

We present a method which can identify the start- and end times of a periodic burst of gamma rays. The assumption is that the periodic light curve has power in the fundamental harmonic and that the noise (i.e. cosmic ray) ...
An improved molecular orbital localization scheme

Verwoerd W.S.; Nolting V. (1991)

A fully symmetrical orthogonalization algorithm is described and applied to the localized orbitals (LMOs) generated by the previously published POPLOC localization program. The results are compared with those of the ψ ...
Comparative education - Perspectives in a changing South Africa

Pretorius F. (Kluwer Academic Publishers, 1992)

[No abstract available]
Model for organizing information security documentation

du Toit L.M.; Von Solms S.H. (Publ by Elsevier Science Publishers B.V., Amsterdam, Netherlands, 1993)

The ISD Model describes a way to organize all relevant security measures, documentation and management's point of view in order to ensure a more effective implementation of information security. The model consists of three ...
Energy and the community of the poor. Urban settlements, household needs and participatory development in South Africa

de Beer F.; Swanepoel H. (1994)

The main objective of this paper is to emphasize the need for community participation in decision making affecting their lives and development. Opinion leaders and executives (especially those of a corporate background) ...
Estimating the trends in herbivore numbers in the Southern District of the Kruger National Park

Eiselen R. (1994)

Census data over several years of survey were utilized to develop a sampling strategy in which the species totals for both abundant and rare herbivore species can be estimated with aerial sample surveys. Correspondence ...
A peoplecentred perspective on peoplecentred community development

Schenck C.I.; Louw H. (1995)

This article uses the concept of "peoplecentredness' for South Africa to stress the fact that development requires that the people themselves - who are meant to be the beneficiaries of development initiatives - be placed ...
Training for Community Development. Some Guidelines from the Literature, Some Lessons from Experience

De Beer F. (1995)

[No abstract available]
New form of the Fourier transform for time-varying frequency estimation

Katkovnik Vladimir (IEEE, Piscataway, NJ, United States, 1995)

The local polynomial Fourier transform (LPFT) and the local polynomial periodogram (LPP) are proposed in order to estimate the rapidly time-varying instantaneous frequency (IF) Ω(t) of a harmonic signal. The LPFT gives the ...
Efficient Image Matching: A Hierarchical Chamfer Matching Scheme Via Distributed System

You J.; Pissaloux E.; Zhu W.P.; Cohen H.A. (1995)

Image matching has played a key role in object recognition and localization. One central problem is to find an efficient and effective approach to search for the best matching between two image sets. In contrast to the ...
The afrocentric-eurocentric debate in Africa: From a fruitless dichotomy to critical dialogue (Brief Communication)

Dick A.L. (1995)

The "Afrocentric-Eurocentric approaches" dichotomy is strangely out-of-place in an African context and is curiously out-of-touch with the issues that are significant in library and information work. In its predominant ...
Training of racially mixed groups in South Africa

Swanepoel H.; Beer F.D. (1995)

In South Africa training in community development of racially mixed groups can experience problems because of the distrust between races, caused mainly by ignorance of each other. This case study depicts an occasion where ...

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