Research Articles (Physics): Recent submissions

Now showing items 461-480 of 719

Rare earth interstitials in Ge : a hybrid density functional theory study

Igumbor, Emmanuel; Andrew, Richard Charles; Meyer, Walter Ernst (Springer, 2017-02)

In this work, the results of density functional theory calculations for rare earth (Ce, Pr, Eu, and Er) interstitials in Ge are presented. We employed the hybrid functional of Heyd, Scuseria, and Ernzerhof (HSE06) for ...
Optimisation of the synthesis of ZrC coatings in a radio frequency induction-heating chemical vapour deposition system using response surface methodology

Biira, Saphina; Crouse, Philippus L.; Bissett, H.; Alawad, B.A.B.; Hlatshwayo, Thulani Thokozani; Nel, J.T.; Malherbe, Johan B. (Elsevier, 2017-02)

A chemical vapour deposition process using radio frequency induction heating operating at atmospheric pressure was developed for the deposition of ZrC coatings. The precursors utilised in this process were zirconium ...
Influence of the substrate gas-inlet gap on the growth rate, morphology and microstructure of zirconium carbide films grown by chemical vapour deposition

Biira, Saphina; Alawad, B.A.B.; Bissett, H.; Nel, J.T.; Ntsoane, Tshepo Paul; Hlatshwayo, Thulani Thokozani; Crouse, Philippus L.; Malherbe, Johan B. (Elsevier, 2017-01)

The influence of the gap between the gas inlet and the substrate in an in-house developed thermal chemical vapour deposition (CVD) reactor, on the growth rate, surface morphology, phase composition and microstructure of ...
Cycling and floating performance of symmetric supercapacitor derived from coconut shell biomass

Barzegar, Farshad; Khaleed, Abubakar A.; Ugbo, F.U.; Oyeniran, K.O.; Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I. (American Institute of Physics, 2016)

This work present two-step synthesizes route to low-cost mesoporous carbon from coconut shell. The electrochemical characterization of the coconut shell based activated carbon (CSAC) material as electrode for supercapacitor ...
Single-molecule identification of quenched and unquenched states of LHCII

Schlau-Cohen, Gabriela S.; Yang, Hsiang-Yu; Kruger, T.P.J. (Tjaart); Xu, Pengqi; Gwizdala, Michal; Van Grondelle, Rienk; Croce, Roberta; Moerner, W.E. (American Chemical Society, 2015-03)

In photosynthetic light harvesting, absorbed sunlight is converted to electron flow with near-unity quantum efficiency under low light conditions. Under high light conditions, plants avoid damage to their molecular ...
Band offset engineering in C-functionalized boronitrene

Obodo, K.O. (Kingsley Onyebuchi); Chetty, Nithaya; Obodo, J.T. (Elsevier, 2017-02)

Using density functional theory within the generalized gradient approximation (GGA), we explore the elastic and electronic properties of monolayer boronitrene containing a double line of substituted carbon atoms. This ...
Effect of activated carbon on the enhancement of CO sensing performance of NiO

Khaleed, Abubakar A.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Ugbo, F.U.; Akande, A.A.; Dhonge, B.P.; Barzegar, Farshad; Olaniyan, Okikiola; Mwakikunga, B.W.; Manyala, Ncholu I. (Elsevier, 2017-02)

NiO/activated carbon (AC) composites were successfully synthesized via a hydrothermal reflux process as an electrode material for carbon monoxide (CO) gas sensor application. The X-ray diffraction (XRD) analysis was used ...
Surface and interface structural analysis of W deposited on 6H–SiC substrates annealed in argon

Thabethe, Thabsile Theodora; Njoroge, Eric Gitau; Hlatshwayo, Thulani Thokozani; Ntsoane, Tshepo Paul; Malherbe, Johan B. (Royal Society of Chemistry, 2017)

A study of a tungsten (W) thin film deposited on a single crystalline 6H–SiC substrate and annealed in Ar at temperatures of 700 C, 800 C, 900 C and 1000 C for 1 hour was conducted. The subsequent solid state reactions, ...
Unravelling the glass trade bead sequence from Magoro Hill, South Africa : separating pre-seventeenth-century Asian imports from later European counterparts

Koleini, Farahnaz; Prinsloo, Linda Charlotta; Biemond, Wim; Colomban, Philippe; Ngo, Anh‑Tu; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M.; Van Brakel, Koos (BioMed Central, 2016-12-22)

Excavations conducted between 2010 and 2012 at Magoro Hill, a site in South Africa’s Limpopo Province frequented or intermittently occupied by African farming communities since the first millennium AD, yielded a substantial ...
The mystery of the missing Macowania - solved!

Clark, Ralph; Bentley, Joanne; Dold, Tony; Zikishe, Vathiswa; Barker, Nigel (Botanical Society of SA, 2016-09)

Macowania revoluta is endemic to the beautiful Amathole Mountains in the Eastern Cape province. First collected by Peter MacOwan in the eastern Amatholes in 1868, the species was described by Joseph Hooker in Icones ...
Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Bello, Abdulhakeem; Fashedemi, Omobosede O.; Fabiane, Mopeli; Lekitima, Joel N.; Ozoemena, Kenneth I.; Manyala, Ncholu I. (Elsevier, 2013-12)

A green chemistry approach (hydrothermal microwave irradiation) has been used to deposit manganese oxide on nickel foam-graphene. The 3D graphene was synthesized using nickel foam template by chemical vapor deposition ...
Multi-channel analog of the effective-range expansion

Rakityansky, Sergei Anatoljevich; Elander, N. (IOP Publishing, 2011)

Similarly to the standard effective range expansion that is done near the threshold energy, we obtain a generalized power-series expansion of the multi-channel Jost- matrix that can be done near an arbitrary point on the ...
The effect of high temperatures on the electrical characteristics of Au/n-GaAs Schottky diodes

Tunhuma, Shandirai Malven; Auret, Francois Danie; Legodi, Matshisa Johannes; Diale, M. (Mmantsae Moche) (Elsevier, 2016-01)

In this study, the current–voltage (I–V) and capacitance–voltage (C–V) characteristics of Au/n-GaAs Schottky diodes have been measured over a wide temperature range, 80–480 K. The diodes were rectifying throughout the range ...
Activated carbon derived from tree bark biomass with promising material properties for supercapacitors

Momodu, Damilola Y.; Madito, M.J. (Moshawe); Barzegar, Farshad; Bello, Abdulhakeem; Khaleed, Abubakar A.; Olaniyan, Okikiola; Dangbegnon, Julien K.; Manyala, Ncholu I. (Springer, 2017-03)

Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different temperatures (600, 700 and 800 °C) using potassium hydroxide (KOH) ...
Ab initio study of aluminium impurity and interstitial-substitutional complexes in Ge using a hybrid functional (HSE)

Igumbor, Emmanuel; Mapasha, Refilwe Edwin; Meyer, Walter Ernst (Springer, 2017-07)

The results of an ab initio modelling of aluminium substitutional impurity (AlGe), aluminium interstitial in Ge [IAl for the tetrahedral (T) and hexagonal (H) configurations] and aluminium interstitial-substitutional ...
Coniferous pine biomass : a novel insight into sustainable carbon materials for supercapacitors electrode

Manyala, Ncholu I.; Bello, Abdulhakeem; Barzegar, Farshad; Khaleed, Abubakar A.; Momodu, Damilola Y.; Dangbegnon, Julien K. (Elsevier, 2016-10)

Low-cost biomass-derived activated porous carbon from natural pine cones is synthesized using hydrothermal approach followed by KOH activation and carbonization. The produced carbon materials have a high surface area of ...
Electrical characterization of metastable defects introduced in GaN by eu-ion implantation

Auret, Francois Danie; Meyer, Walter Ernst; Diale, M. (Mmantsae Moche); Janse van Rensburg, Pieter Johan; Song, S.F.; Temst, K.; Vantomme, A. (Trans Tech, 2011-03)

Gallium nitride (GaN), grown by HVPE, was implanted with 300 keV Eu ions and then annealed at 1000 oC . Deep level transient spectroscopy (DLTS) and Laplace DLTS (L-DLTS) were used to characterise the ion implantation ...
Towards refining the classification of glass trade beads imported into Southern Africa from the 8th to the 16th century AD

Koleini, Farahnaz; Prinsloo, Linda Charlotta; Biemond, Wim M.; Colomban, Philippe; Ngo, Anh-Tu; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M. (Elsevier, 2016-05)

Tracing the origin of glass trade beads excavated at archaeological sites can contribute significantly to dating a site and reconstructing prehistoric trade routes. Wood developed a temporally sensitive bead sequence ...
Electrical characterization of high energy electron irradiated Ni/4H-SiC Schottky barrier diodes

Paradzah, Alexander Tapera; Omotoso, Ezekiel; Legodi, Matshisa Johannes; Auret, Francois Danie; Meyer, Walter Ernst; Diale, M. (Mmantsae Moche) (Springer, 2016-08)

The effect of high energy electron (HEE) irradiation on Ni/4H-SiC Schottky barrier diodes was evaluated by current-voltage (I-V) and capacitance-voltage (C-V) measurements at room temperature. Electron irradiation was ...
Energetic and spatial characterization of seismicity in the Algeria–Morocco region

Hamdache, M.; Peláez, J.A.; Kijko, Andrzej; Smit, Ansie (Springer, 2017-04)

We estimate the energetic and spatial characteristics of seismicity in the Algeria–Morocco region using a variety of seismic and statistical parameters, as a first step in a detailed investigation of regional seismic ...

Now showing items 461-480 of 719

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