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Constraints on an annihilation signal from a core of constant dark matter density around the Milky Way center with H.E.S.S.
(American Physical Society, 2015)
An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No ...
A twostep clustering algorithm as applied to crime data of South Africa
(Virtus Interpress, 2015)
This study applied a TwoStep cluster analysis on the 29 serious crimes reported at 1119 police stations across South Africa for the 2009/2010 financial year. Due to this high number of variables and observations, it becomes ...
A comparison of the mathematical knowledge and skills of first-year student cohorts from a transmission and an outcomes-based curriculum
(Taylor & Francis, 2015)
The traditional transmission-based school curriculum in South Africa has been replaced by an outcomes-based school curriculum since 1998. In this article we report on a comparative study on the mathematical knowledge and ...
Intelligente beheer van ’n hernubare, energiedoeltreffende tenk vir melkboerderye
(AOSIS, 2015)
To reduce strain on Eskom and decrease the cost for producing dairy products, an energy-efficient
bulk storage tank using solar power was designed. The system uses thermoelectric cooling
modules as a supporting cooling ...
Partial and average copulas and association measures
(Institute of Mathematical Statistics, 2015)
For a pair (Y1,Y2) of random variables there exist several measures of association that characterize the dependence between Y1 and Y2 by means of one single value. Classical examples are Pearson’s correlation coefficient, ...
Simple forms and invariant subspaces of H-expansive matrices
(Elsevier, 2015)
In this paper we consider a simple form for pairs of matrices (A,H)(A,H), where H is a real symmetric invertible matrix, and A is a real H -expansive matrix, that is, ATHA−HATHA−H is positive semidefinite. For such pairs ...
Uniform in bandwidth consistency of kernel estimators of the density of mixed data
(Institute of Mathematical Statistics, 2015)
We establish a general uniform in bandwidth consistency result for kernel estimators of the unconditional and conditional joint density of a distribution, which is defined by a mixed discrete and continuous random variable
Reaction of a fluorine atom with methanol: potential energy surface considerations
(American Chemical Society, 2015)
There are several experimental studies of the F + CH3OH reaction but very little in the way of reliable theory. Here reported are aug-cc-pVQZ CCSD(T) computations for two different reaction pathways. The more exothermic ...
Spectral, thermal stability and antibacterial studies of copper, nickel and cobalt complexes of N-methyl-N-phenyl dithiocarbamate
(Taylor & Francis, 2015)
Copper(II), cobalt(II) and nickel(II) bis(N-methyl-N-phenyl dithiocarbamate) complexes having the general
formula [M{S2CN(MePh)}2] (where M = Cu, Co and Ni) have been prepared and characterized
by spectral and thermal ...
Solving Parker’s transport equation with stochastic differential equations on GPUs
(Elsevier, 2015)
The numerical solution of transport equations for energetic charged particles in space is generally very costly in terms of time. Besides the use of multi-core CPUs and computer clusters in order to decrease the computation ...