Author:Midgley, JJDate:May 1993There are cape Asteraceae species that have conspicuous dark markings on their ray florets. Such markings are usually interpreted as guides of various sorts. It is thus suggested that the dark raised marks on the ray florets of Gorteria diffusa ...Read more
Author:Olbrich, K; Skoroszewski, R; Van Tienhoven, MDate:Mar 1996This paper aims to address and integrate the three main components of the air pollution problem in South Africa: assessment and measurement of air quality, evaluation of the effects of poor air quality, and management of air quality.Read more
Author:Edholm, JM; Swart, S; Plessis, Marcel D; Nicholson, Sarah-AnneDate:Aug 2022Atmospheric rivers (ARs) dominate moisture transport globally; however, it is unknown what impact ARs have on surface ocean buoyancy. This study explores the surface buoyancy gained by ARs using high-resolution surface observations from a ...Read more
Author:Sithole, Happy M; Ngoepe, PE; Wright, KDate:Oct 2003Interatomic potential parameters have been derived at simulated temperatures of 0 K and 300 K to model pyrite FeS2. The predicted pyrite structures are within 1% of those determined experimentally, while the calculated bulk modulus is within ...Read more
Author:Ngoepe, PE; Ntoahae, PS; Mangwejane, SS; Sithole, Happy M; Parker, SC; Wright, KV; De Leeuw, NHDate:Sep 2005The authors present the results of atomistic simulations using derived interatomic potentials for the pyrite-structured metal chalcogenides FeS2, PtSb2 and PtAs2. Structural and elastic constants were calculated and compared with experimental ...Read more
Author:Ramotsoela, DT; Hancke, GP; Abu-Mahfouz, Adnan MIDate:Apr 2019The threat to critical water system infrastructure has increased in recent years as is evident from the increasing number of reported attacks against these systems. Preventative security mechanisms are often not enough to keep attackers out ...Read more
Author:Shingange, Katekani; Swart, HC; Mhlongo, Gugu HDate:Apr 2018Herein, we present ZnO rose-like hierarchical nanostructures employed as support to Au nanoparticles to produce Au functionalized three dimensional (3D) ZnO hierarchical nanostructures (Au/ZnO) for NO2 detection using a microwave-assisted ...Read more
Author:Linganiso, EC; Mwakikunga, Bonex W; Mhlanga, SD; Coville, NJDate:Nov 2014Nickel sulphide (NiS) nanostructures decorated with gold (Au) nanoparticles (NPs) were synthesized via a microwave-assisted hydrothermal technique. Binary phase NiS (a and ß) crystalline nanostructures, bare, and decorated with Au NPs were ...Read more
Author:Govender, Devashen; Moodley, Jayandren; Balmahoon, ReevanaDate:Oct 2021In today’s era, enormous amounts of data are generated and the means to visualize this data is becoming a challenge. Data visualization is an important support tool that allows one to make informed decisions. This paper attempts to provide a ...Read more
Author:Adetunji, RO; Strydom, MA; Herselman, Martha E; Botha, AdèleDate:Oct 2022As global health concerns become more complex, technological intervention is needed to achieve the Sustainable Development Goal. This study explores the use of the internet of things (IoT) and augmented reality (AR) applications for medication ...Read more
Author:Shou, KJ; Napier, JALDate:Jul 2000This paper is about the reply to discussion by E. Siebrits and S. L. Crouch regarding the paper "A two-dimensional linear variation displacement discontinuity method for three-layered elastic media". The purpose of the paper was to apply a ...Read more
Author:Onumanyi, Adeiza J; Molokomme, Daisy N; Isaac, Sherrin J; Abu-Mahfouz, Adnan MIDate:2022The elbow technique is a well-known method for estimating the number of clusters required as a starting parameter in the K-means algorithm and certain other unsupervised machine-learning algorithms. However, due to the graphical output nature ...Read more
Author:Eberle, D; Hutchins, D; Das, Sonali; Majumdar, A; Paasche, HDate:Jun 2015This paper demonstrates a methodology for the automatic joint interpretation of high resolution airborne geophysical and space-borne remote sensing data to support geological mapping in a largely automated, fast and objective manner. At the ...Read more
Author:Darlow, LN; Webb, L; Botha, NDate:May 2016Fingerprint recognition systems are prevalent in high-security applications. As a result, the act of spoofing these systems with artificial fingerprints is of increasing concern. This research presents an automatic means for spoof-detection ...Read more
Author:Badenhorst, JAC; Van Niekerk, DR; Barnard, EDate:Nov 2006Improving the pronunciations of non-native language learners is an important task in a multilingual society. We focus on segmental aspects of pronunciation, and investigate the design of automated assistants that can be used to improve (1) ...Read more
Author:Heyes, AMDate:Jun 1998The failure of vehicle components is an area which is likely to affect all of us at one stage or another. In this paper the distribution of component failures is discussed, as well as the causes thereof. Four case studies are presented to ...Read more
Author:Long, Craig S; Loveday, Philip W; Groenwold, AADate:Jan 2009Two new solid-of-revolution axisymmetric finite elements, which account for hoop fibre rotations, are introduced. The first is based on an irreducible formulation, with only displacement and rotation fields assumed independently. The second ...Read more
Author:Litvin, IA; Dudley, Angela L; Roux, FS; Forbes, ADate:May 2012We demonstrate a simple approach, using digital holograms, to perform a complete azimuthal decomposition of an optical field. Importantly, we use a set of basis functions that are not scale dependent so that unlike other methods, no knowledge ...Read more