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RISS 인기검색어
- 검색키워드
- 저자 : Khumalo, Melusi (검색결과 4 건)
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Oxide reduced silicon nanowires
Z.M. Khumalo,M. Blumenthal,M. Topic,C. Funke,J. Bollmann,A. Vantomme,C. Ndlangamandla 한국물리학회 2018 Current Applied Physics Vol.18 No.5
Core crystalline silicon nanowires with a heavily reduced amorphous shell have been successfully synthesised using palladium as a metal catalyst. We present two approaches to reduce the oxidation of the nanowires during the thermal annealing growth. The ratios of the amorphous shell to crystalline core of the nanowires produced, from the two methods, are compared and show a remarkable drop (hence thinner oxide) compared to wires fabricated using currently available techniques. In addition, a focused ion beam was utilised to contact the oxide-reduced nanowires for transport measurements, without first removing the thin oxide shell. The oxygen-reduced core-shell silicon nanowires showed a very low electrical resistivity (4 × 10−1 Ω cm). Our novel approach presents a new alternative to the production of low cost, high yield, highly conducting silicon nanowires offering a wide range of opportunities for semiconductor based technology.
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TRANSFORMATION OF LOCAL BIFURCATIONS UNDER COLLOCATION METHODS
Foster, Andrew,Khumalo, Melusi Korean Mathematical Society 2011 대한수학회지 Vol.48 No.6
Numerical schemes are routinely used to predict the behavior of continuous dynamical systems. All such schemes transform flows into maps, which can possess dynamical behavior deviating from their continuous counterparts. Here the common bifurcations of scalar dynamical systems are transformed under a class of algorithms known as linearized one-point collocation methods. Through the use of normal forms, we prove that each such bifurcation in an originating flow gives rise to an exactly corresponding one in its discretization. The conditions for spurious period doubling behavior under this class of algorithm are derived. We discuss the global behavioral consequences of a singular set induced by the discretizing methods, including loss of monotonicity of solutions, intermittency, and distortion of attractor basins.
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TRANSFORMATION OF LOCAL BIFURCATIONS UNDER COLLOCATION METHODS
Andrew Foster,Melusi Khumalo 대한수학회 2011 대한수학회지 Vol.48 No.6
Numerical schemes are routinely used to predict the behav-ior of continuous dynamical systems. All such schemes transform flows into maps, which can possess dynamical behavior deviating from their continuous counterparts. Here the common bifurcations of scalar dynamical systems are trans-formed under a class of algorithms known as linearized one-point colloca-tion methods. Through the use of normal forms, we prove that each such bifurcation in an originating flow gives rise to an exactly correspond-ing one in its discretization. The conditions for spurious period dou-bling behavior under this class of algorithm are derived. We discuss the global behavioral consequences of a singular set induced by the discretiz-ing methods, including loss of monotonicity of solutions, intermittency,and distortion of attractor basins.
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Foroushani Fatemeh Tavakoli,Dzobo Kevin,Khumalo Nonhlanhla P,Mora Vanessa Zamora,de Mezerville Roberto,Bayat Ardeshir 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Silicone breast implants are commonly used for cosmetic and oncologic surgical indications owing to their inertness and being nontoxic. However, complications including capsular contracture and anaplastic large cell lymphoma have been associated with certain breast implant surfaces over time. Novel implant surfaces and modifications of existing ones can directly impact cell-surface interactions and enhance biocompatibility and integration. The extent of foreign body response induced by breast implants influence implant success and integration into the body. This review highlights recent advances in breast implant surface technologies including modifications of implant surface topography and chemistry and effects on protein adsorption, and cell adhesion. A comprehensive online literature search was performed for relevant articles using the following keywords silicone breast implants, foreign body response, cell adhesion, protein adsorption, and cell-surface interaction. Properties of silicone breast implants impacting cell-material interactions including surface roughness, wettability, and stiffness, are discussed. Recent studies highlighting both silicone implant surface activation strategies and modifications to enhance biocompatibility in order to prevent capsular contracture formation and development of anaplastic large cell lymphoma are presented. Overall, breast implant surface modifications are being extensively investigated in order to improve implant biocompatibility to cater for increased demand for both cosmetic and oncologic surgeries.
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