Return on Capital Employed (ROCE) is a popular financial instrument and communication tool for the appraisal of companies. Often, companies management and other practitioners use untested rules and behavioural approach ...
The poor performance by South African pupils in The Third International Mathematics and Science Study highlighted the importance of and need for Continuing Professional Development (CPD) for South African mathematics ...
NaYF4:Yb3+/Er3+ and NaGdF4:Yb3+/Nd3+ nanocrystals were prepared using a solution combustion (SC) method and their properties were evaluated for potential use as photon harvesters in photovoltaic solar cells (PSCs). The ...
Over the past two decades there has been an upsurge in interest in structural equation
modelling (SEM). Applications abound in the social sciences and econometrics, but
the use of this multivariate technique is not so ...
The objective of this study was to investigate whether community print media is fulfilling its developmental mandate in society using a comparative study of Alex News and Greater Alex Today community newspapers. This study ...
Polycrystalline Zn1-xCrxO (0.01 ≤ x ≤ 0.09) samples synthesized by solid state reaction technique were sintered at different temperatures following slow step sintering schedule. Structural, micro-structural, optical, ...
A two-dimensional integrodi erential equation resulting from the use of potential harmonics
expansion in the many-body Schr odinger equation is used to study ground-state
properties of selected few-body nuclear systems. ...
This study estimates cointegration models by applying the Engle-Granger (1989) two-step estimation procedure, the Phillip-Ouliaris (1990) residual-based test and Johansen’s multivariate
technique. The cointegration ...
Un-doped, Er3+ doped (TiO2:Er3+) as well as Er3+/Yb3+ co-doped (TiO2:Er3+/Yb3+) nanocrystals with different concentrations of RE3+ (Er3+, Yb3+) were successfully synthesized using the sol-gel method.
The powder X-ray ...
The acid-catalyzed inversion of sucrose is often taken as an example of a first order reaction. It is, however, influenced by many factors such as temperature, type of acid used, concentration of sucrose, and the concentration ...
Two well-known methods of improving the reliability of a system are
(i) provision of redundant units, and
(ii) repair maintenance.
In a redundant system more units made available for performing the system function
when ...
Let L be a zero-dimensional frame and ZL be the ring of continuous integer-valued functions on L. We associate with each sublocale of L, the Banaschewski compacti cation of L, an ideal of ZL, and study the behaviour of ...
Which matrices can be written as sums or products of square-zero matrices? This
question is the central premise of this dissertation. Over the past 25 years a signi -
cant body of research on products and linear combinations ...
This study explored and evaluated the prevalence of supplementary tuition in the teaching and learning of Mathematics/Mathematical Literacy in some high-performing schools of the East London district in the Eastern Cape. ...
The development of cost-effective and scalable synthetic methods is of paramount importance
to achieve industrial application of energy conversion and storage devices based on layered
double hydroxides (LDH). Herein, ...
In this work, alkaline earth aluminate phosphors doped with rare-earth ions and manganese were
synthesized using combustion method. Several characterization techniques were used to study
the structural and luminescent ...
Specially prepared 2-arylquinolin-4(1H)-ones and their 2-aryl-1-methyl-4-quinolone derivatives were converted in high yield and purity to the corresponding C-3 brominated products using pyridinium tribromide in acetic acid ...
The 2-aryl-2,3-dihydroquinolin-4(1H)-ones were prepared via acid-catalyzed cyclization of the corresponding 2-aminochalcones, which were in turn, prepared by base-promoted Claisen-Schmidt aldol condensation of 2-aminoacetophenone ...
The main objective of this investigation was to study palladium-catalyzed coupling of
2-aryl-4-chloro-3-iodoquinolines with phenyl boronic acid in order to assess the
regioselectivity of carbon-carbon bond formation at ...
An environmental friendly and simple approach to synthesis of Platinum (Pt), Palladium (Pd),
Rhodium (Rh) and Osmium (Os) nanoparticles via gamma radiolysis is demonstrated. Herein,
we report on the effect of gamma rays ...