Author:Sitas, Nadia E; Prozesky, HE; Esler, KJ; Reyers, BDate:Oct 2014Despite much progress in ecosystem services research, a gap still appears to exist between this research and the implementation of landscape management and development activities on the ground, especially within a developing country context. ...Read more
Author:Chou, HN; Govender, G; Ivanchev, LDate:2006SSM is now considered an established technology to produce high integrity near net shape components for the automotive industry in particular. Although it is used extensively in the automotive industry, very little attention has been given ...Read more
Author:Van Vuuren, DS; Engelbrecht, AD; Hadley, TDDate:Oct 2005The value chain of titanium products shows that the difference between the cost of titanium ingot and titanium dioxide is about $9/kg titanium. In contrast, the price of aluminum, which is produced in a similar way, is only about $1.7/kg. ...Read more
Author:Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen CDate:Jun 2008If a heated pipe is rotated about its axis, a density gradient is formed which results in the pipe acting as a graded index lens. In this study the authors revisit the concept of a spinning pipe gas lens and for the first time analyse both ...Read more
Author:Moloto, N; Mpelane, S; Sikhwivhilu, LM; Ray, Suprakas SDate:2012A microwave-assisted hydrothermal method was used to synthesize ZnO and TiO2 nanostructures. The experimental results show that the method resulted in crystalline monodispersed ZnO nanorods that have pointed tips with hexagonal crystal phase. ...Read more
Author:Berruet, M; Pereyra, CJ; Mhlongo, Gugu H; Dhlamini, MS; Hillie, KT; Vázquez, M; Marotti, REDate:Oct 2013Nanostructured zinc oxide thin films were spin coated on conductive glass substrates via a sol–gel based technique using zinc acetate dihydrate as precursor. The pH of the alkalis used as catalytic agents in the hydrolysis step is shown to ...Read more
Author:Ashok, AC; Marchington, RF; Mthunzi-Kufa, Patience; Krauss, TF; Dholakia, KDate:Mar 2010The authors describe the realization of integrated optical chromatography, in conjunction with on-chip fluorescence excitation, in a monolithically fabricated poly-dimethylsiloxane (PDMS) microfluidic chip. The unique endlessly-single-mode ...Read more
Author:Trichili, A; Rosales-Guzmán, C; Dudley, Angela L; Ndagano, B; Salem, AB; Zghal, M; Forbes, ADate:Jun 2016Mode division multiplexing (MDM) is mooted as a technology to address future bandwidth issues, and has been successfully demonstrated in free space using spatial modes with orbital angular momentum (OAM). To further increase the data transmission ...Read more
Author:Ramkilowan, A; Chetty, N; Lysko, M; Griffith, DDate:Apr 2013Higher water temperatures and nutrient loads, along with forecasted climate changes are expected to result in an increase in the frequency and intensity of eutrophication-linked algal blooms (Bernard, 2010, unpublished). The destructive impact ...Read more
Author:Chetty, N; Ramkilowan, A; Griffith, DJ; Lysko, MDDate:Apr 2013South Africa’s fresh water resources are under threat by Harmful Algal Blooms (HABs). A comprehensive and cost effective method for wide area detection and monitoring of HABs is therefore needed to manage and where possible circumvent the ...Read more
Author:Mabena, Chemist M; Roux, FSDate:Jan 2019The evolution of classical optical fields propagating through atmospheric turbulence is investigated under arbitrary conditions. We use the single-phase screen (SPS) method and the infinitesimal propagation equation (IPE), a multiphase screen ...Read more
Author:Kumbhakar, P; Ray, Suprakas S; Stepanov, ALDate:2014Semiconductor and metallic nanomaterials and nanocomposites possess interesting linear absorption, photoluminescence emission, and nonlinear optical properties. Nanomaterials having small particle sizes exhibit enhanced optical emission as ...Read more
Author:Kunert, HW; Govender, M; Machatine, AGJ; Mwakikunga, Bonex W; Niyongabo, PDate:Feb 2014At sufficiently high pressures, wurtzite structure zinc oxide (W-ZnO) can be transformed to the cubic rocksalt (R-ZnO) structure. The R-ZnO exhibits semiconductor behavior with an indirect wide band gap of inline image. The maximum valence ...Read more
Author:Koen, W; Jacobs, Cobus; Bollig, C; Strauss, Hencharl J; Esser, MJD; Botha, LRDate:Jun 2014An optically pumped tunable HBr laser has been demonstrated for the first time. The pump source was a single-frequency Ho:YLF laser and amplifier system, which was locked to the 2064 nm absorption line of HBr. Laser oscillation was demonstrated ...Read more
Author:Pienaar, M; Woodborne, S; Wadley, LDate:Jan 2008Six Optically stimulated luminescence (OSL) dates are compared with stratigraphically associated C-14 dates from Rose Cottage Cave. The OSL dates overlap the accepted C-14 chronology except for one sample that overestimates the expected age ...Read more
Author:Sichilalu, S; Tazvinga, Henerica; Xia, XDate:Oct 2016This paper presents an optimal energy management strategy for a grid-tied photovoltaic–wind-fuel cell hybrid power supply system. The hybrid system meets the load demand consisting of an electrical load and a heat pump water heater supplying ...Read more
Author:Cho, Moses A; Ramoelo, AbelDate:Sep 2019The varying proportions of tree and herbaceous cover in the grassland and savanna biomes of Southern Africa determine their capacity to provide ecosystem services. The asynchronous phenologies e.g. annual NDVI profiles of grasses and trees ...Read more
Author:Gopal, Ajith K; Adali, S; Verijenko, VEDate:Jan 2000Manufacturing of polymer composites using a curing process requires the specification of the temperature as a function of time, i.e., the temperature profile. It is of utmost importance that the selected profile satisfies a number of criteria ...Read more