Author:Theron, Andre; Engelbrecht, JeanineDate:Sep 2018Sinkholes are global phenomena with significant consequences on the natural- and built environment. Significant efforts have been devoted to the assessment of sinkhole hazards to predict the spatial and temporal occurrence of future sinkholes ...Read more
Author:Greben, JMDate:Jun 2010The author discusses a new theory of the universe in which the vacuum energy is classical origin and dominates the energy content of the universe. As usual, the Einstein equations determine the metric of the universe. However, the scale factor ...Read more
Author:Opoku, F; Govender, Krishna; van Sittert, CGCE; Govender, PPDate:Oct 2017The global dependence on exhaustible fossil fuel resources has made the search for an alternative renewable and sustainable fuel more urgent. Photocatalysis has gained increasing consideration as a promising technology to solve problems ...Read more
Author:Greesh, N; Ray, Suprakas S; Bandyopadhyay, JDate:Oct 2013This work evaluates the role of the surface properties and shape of clay type on the morphology, thermal, and thermo-mechanical properties of the polystyrene (PS)/clay nanocomposites prepared via free-radical emulsion polymerization. Attapulgite ...Read more
Author:Monteiro, Pedro MS; Dewitte, B; Scranton, MI; Paulmier, A; Van der Plas, AKDate:2011In this study the authors investigate the possible reasons for the widespread differences between the seasonal cycles of carbon production and export compared to those of hypoxia in eastern boundary upwelling systems. An idealized model is ...Read more
Author:Malwela, T; Ray, Suprakas SDate:Sep 2014This study reports the effect of organically modified nanoclay on the morphology and crystal growth behavior of biodegradable polylactide/poly[(butylene succinate)-co-adipate] (PLA/PBSA) blend thin films with the average thickness of 280 nm. ...Read more
Author:Marais, Mario A; Lotriet, H; Matthee, M; De Moor, ADate:Nov 2022This paper tells the story of an Information and Communication Technology for Development (ICT4D) project and a research approach. The research used a novel definition of sustainable development that emerged from South American development ...Read more
Author:Ojijo, Vincent O; Ray, Suprakas S; Sadiku, RDate:Dec 2012Binary blends of two biodegradable polymers: polylactide (PLA), which has high modulus and strength but is brittle, and poly[(butylene succinate)-co-adipate] (PBSA), which is flexible and tough, were prepared through batch melt mixing. The ...Read more
Author:Kenyon, CP; Steyn, A; Roth, Robyn L; Steenkamp, PA; Nkosi, TC; Oldfield, LCDate:Jul 2011Kinase and synthetase enzymes utilise C8D-ATP in preference to non-deuterated ATP. The KIE obtained at low ATP concentrations is clearly a primary KIE demonstrating strong evidence that the bond to the isotopically substituted hydrogen is ...Read more
Author:Sutcliffe, PRDate:Aug 1995Geomagnetic field research carried out at the Hermanus Magnetic Observatory over the past decade is reviewed. An important aspect of this research has been the study of geomagnetic field variations, with particular emphasis on ULF geomagnetic ...Read more
Author:Funke, Nicola S; Huitema, D; Petersen, A; Nienaber, SDate:Jul 2020The Advocacy Coalition Framework (ACF) remains one of the leading conceptual models in the policy sciences because it continues to be revised and updated as required. A focus area of the ACF that requires further theorization is the roles of ...Read more
Author:Machaka, Ronald; Derry, TE; Sigalas, IDate:Jun 2014Nanoindentation has become a widely used and versatile means of characterising the near-surface nanomechanical properties of a wide variety of materials. Yet, the nanomechanical properties of the polycrystalline boron suboxide (B(sub6)O) ...Read more
Author:Joubert, SV; Shatalov, MY; Fay, THDate:May 2009In 1890 Bryan observed that when a vibrating structure is rotated the vibrating pattern rotates at a rate proportional to the rate of rotation. During investigations of the effect in various solid and fluid-filled objects of various shapes, ...Read more
Author:Rawal, A; Gonsalves, JWDate:2006The present work deals with the net structures, which are produced by replacing the static die (spinneret) with two concentric dies rotating in opposite directions in a melt extrusion process. These dies consist of defined number of slots ...Read more
Author:Dlodlo, N; Hunter, Lawrance; Botha, Anton F; Cele, C; Metelerkamp, RDate:Sep 2009This paper describes the concepts and development of a rule-based expert system to establish the optimum linkage between the yarn twist factor and end-use of a yarn and determine the appropriate twist for the particular yarn. The quality of ...Read more
Author:Mapako, M; Prasad, GDate:Apr 2007National electrification programmes are given priority in many developing countries and the level of electrification is generally seen as one of the key indicators of development. Utilities find rural electrification programmes a challenge ...Read more
Author:Mabena, LF; Modibedi, Remegia M; Ray, Suprakas S; Coville, NJDate:Oct 2012Nitrogen-doped carbon nanotubes (N-CNTs) prepared via thermal chemical vapor deposition (CVD), were used to support ruthenium (Ru) nanoparticles made using a microwave assisted reduction technique. The amount of Ru deposited on N-CNTs was ...Read more