Pienaar, Elsje, Viljoen, Hendrik J.
The tri-frame model gives mathematical expression to the transcription and translation processes, and considers all three reading frames. RNA polymerases transcribe DNA in single nucleotide...
Ribosome kinetics and aa-tRNA competition determine rate and fidelity of peptide synthesis (2007)
Fluitt, Aaron, Pienaar, Elsje, Viljoen, Hendrik J.
It is generally accepted that the translation rate depends on the availability of cognate aa-tRNAs. In this study it is shown that the key factor that determines translation rate is the competition...
Raghavan, V., Whitney, Scott E., Ebmeier, Ryan J., Padhye, Nisha V., Nelson, Michael, Viljoen, Hendrik J., ...
In this article, experimental and numerical analyses to investigate the thermal control of an innovative vortex tube based polymerase chain reaction (VT-PCR) thermocycler are described. VT-PCR is...
A QUANTITATIVE MODEL OF ERROR ACCUMULATION DURING PCR AMPLIFICATION (2006)
Pienaar, Elsje, Theron, M., Nelson, M., Viljoen, Hendrik J.
The amplification of target DNA by the polymerase chain reaction (PCR) produces copies which may contain errors. Two sources of errors are associated with the PCR process: (1) editing errors that...
PCR: Replicating success (2005)
PCR often gets taken for granted, but there are ways of making it faster, more accurate and easier to perform. Pete Moore investigates. As a means of rapidly copying a selected template sequence from...
Viljoen, Steve, Griep, Mark A., Nelson, Michael, Viljoen, Hendrik J
The enzymatically catalyzed template-directed extension of ssDNA/primer complex is an impor-tant reaction of extraordinary complexity. The DNA polymerase does not merely facilitate the insertion of...
Ebmeier, Ryan J, Whitney, Scott E, Sarkar, Amitabha, Nelson, Michael, Padhye, Nisha, Gogos, George, ...
An innovative polymerase chain reaction (PCR) thermocycler capable of performing real-time optical detection is described below. This device utilizes the Ranque-Hilsch vortex tube in a system to...
A Macrokinetic Study of the High-Temperature Solid-Phase Titanium-Carbon Reaction (2003)
Kostagorva, Julia Y, Viljoen, Hendrik J, Shteinberg, Alexander S
An experimental method, electro thermal explosion (ETE), is used to measure the macro kinetic parameters of the high-temperature titanium/carbon reaction. Different stages of the reaction have been...
Effective Thermal Conductivity Estimates Of Particulate Mixtures (2003)
Richter, Christiaan, Viljoen, Hendrik J, Rensburg, N.F.J Van
Several theories have been advanced to estimate effective thermal conductivities of particulate mixtures, but most theories have focused on the dilute case. A method is proposed to estimate the...
Effective Thermal Conductivity Estimates Of Particulate Mixtures (2003)
Richter, Christiaan, Viljoen, Hendrik J, Rensburg, N.F.J Van
Several theories have been advanced to estimate effective thermal conductivities of particulate mixtures, but most theories have focused on the dilute case. A method is proposed to estimate the...
NATURAL CONVECTION AND SOLID PHASE COMBUSTION (2003)
Whitney, S E, Viljoen, Hendrik J
Self-propagating high-temperature synthesis [SHS] is a combustion process in-volving two or more solid reactants. The typical SHS configuration consists of a cylin-drical preform of mixed powders,...
Solitary waves and supersonic reaction front in metastable solids (2002)
Viljoen, Hendrik J, Lauderback, Lee L, Sornette, Didier
Motivated by an increasing number of remarkable experimental observations on the role of pressure and shear stress in solid reactions, explosions, and detonations, we present a simple one-dimensional...
Solitary waves and supersonic reaction front in metastable solids (2000)
Viljoen, Hendrik J., Lauderback, Lee L., Sornette, D.
Motivated by an increasing number of remarkable experimental observations on the role of pressure and shear stress in solid reactions,explosions and detonations,we present a simple toy model that...
Solitary waves and supersonic reaction front in metastable solids (2000)
Viljoen, Hendrik J., Lauderback, Lee L., Sornette, D.
Motivated by an increasing number of remarkable experimental observations on the role of pressure and shear stress in solid reactions, explosions and detonations, we present a simple toy model that...
PIEZOELECTRIC SENSORS / ACTUATORS FOR USE IN REFRACTORY ENVIRONMENTS (2000)
Viljoen, Hendrik J, Jooste, Barend R
pierozlectric properties over a large temperature range of from room temperature to approximately 1360 degrees centigrade. The piezarlecttic system is sequentially comprised of a first electrically...
Piezoelectric sensors/actuators for use in refractory environments (2000)
Disclosed is a piezoelectric system which demonstrates piezoelectric properties over a large temperature range of from room temperature to approximately 1360 degrees centigrade. The piezoelectric...
Piezoelectric sensors/actuators for use in refractory environments (2000)
Disclosed is a piezoelectric system which demonstrates piezoelectric properties over a large temperature range of from room temperature to approximately 1360 degrees centigrade. The piezoelectric...
Modeling of Solid Phase Detonations (1999)
Richter, C, Viljoen, Hendrik J, Rensburg, N.F.J Van
In contrast to conventional explosives which constitute rapid decomposition of the molecular structure acconlpanied by the release of large volumes of gaseous products, heterogeneous mixtures in the...
Analysis of combustion-driven acoustics (1998)
Boshoff-Mostert, L, Viljoen, Hendrik J
Abstract-Combustion-driven acoustic oscillations are investigated by performing a onedimensional stability analysis of a burner-stabilized premixed flame. In contrast to other investigators, no...
Jooste, B. R., Viljoen, Hendrik J., Rohde, S. L., Van Rensburg, N. F. J.
Piezoelectric sensors can measure vibrations of solid structures very accurately. A model of a cantilevered beam, with a ZnO film on one side is presented. Both viscous and internal damping are...
Jooste, B. R., Viljoen, Hendrik J., Rohde, S. L., Van Rensburg, N. F. J.
Piezoelectric sensors can measure vibrations of solid structures very accurately. A model of a cantilevered beam, with a ZnO film on one side is presented. Both viscous and internal damping are...
Analysis of homogeneous combustion in Monolithic structures (1996)
An analytical method is used to solve the problem of homogeneous combustion in a monolith.The solid phase acts as burner support. Heat is conducted much more effectively in the solid phase and...
Simulation of the growth of CVD films (1995)
Thiart, Jacob J, Hlavacek, Vladimir, Viljoen, Hendrik J
Chemical vapor deposition (CVD) is the preferred method of manufacture for solid films used in many industrially important thin and thick film applications. Requirements for the physical, mechanical...
Simulation of the growth of CVD films (1995)
Thiart, Jacob J, Hlavacek, Vladimir, Viljoen, Hendrik J
Chemical vapor deposition (CVD) is the preferred method of manufacture for solid films used in many industrially important thin and thick film applications. Requirements for the physical, mechanical...
Simulation of the growth of CVD films (1995)
Thiart, Jacob J, Hlavacek, Vladimir, Viljoen, Hendrik J
Chemical vapor deposition (CVD) is the preferred method of manufacture for solid films used in many industrially important thin and thick film applications. Requirements for the physical, mechanical...
Simulation of the growth of CVD films (1995)
Thiart, Jacob J, Hlavacek, Vladimir, Viljoen, Hendrik J
Chemical vapor deposition (CVD) is the preferred method of manufacture for solid films used in many industrially important thin and thick film applications. Requirements for the physical, mechanical...
Reaction Fronts in a Porous Medium. Approximation Techniques versus Numerical Solution (1995)
Escobedo, Fernando, Viljoen, Hendrik J
The flame sheet approximation (FS) and a novel polynomial approximation technique (PA) are compared in terms of their capability to describe reaction fronts of highly exothermic reactions in a porous...
Modeling of a-Si : H deposition in a DC glow discharge reactor (1992)
Orlicki, Dariusz, Hlavacek, Vladimir, Viljoen, Hendrik J
PECVD reactors are increasingly used for the manufacturing of electronic components. This paper presents a reactor-indelfoithe deposition of amorphous hydrogenated silicon in a dc glow discharge of...
Viljoen, Hendrik J, Hlavacek, Vladimir
Resistively heated filaments are used to manufacture ceramic fibers. When an ac power source is used for heating, the temperature of the filament oscillates. These oscillations influence the...
Analysis of transport phenomena in the coating of fibers by CVD (1991)
Scholtz, J H, Gatica, J E, Viljoen, Hendrik J
Inorganic coated fibres produced by chemical vapour deposition find several technological applications. In this CVD process, a filler core is mounted in a reactor between two electrodes. Reactive...
Stability of Poiseuille-Couette Flow Between Concentric Cylinders (1990)
Scholtz, J H, Viljoen, Hendrik J, Wright, C J
The stability of laminar flow between concentric cylinders is analyzed. Conhinrd Poiseuille and Couette flows are considered. It is shown that instabilities exist if the laminar flow is synnetric or...
Convective Regimes in reactive Fluid media due to the interaction with Catalytic Surfaces (1989)
Viljoen, Hendrik J, Gatica, Jorge E., Hlavacek, Vladimir
Reactive fluid media enclosed in a cavity with a catalytic surface are analyzed. Nonisothermal chemical reactions on this surface can lead to convective instabilities. A simplified model is developed...
Chemically Driven Convection in a Porous Medium. (1987)
Viljoen, Hendrik J, Hlavacek, V
This paper is focused on the analysis of interaction of free convection and exothermic chemical reaction. As a consequence of the chemical reaction, free convection effects can result. It is...