School of Science: Recent submissions

Now showing items 161-180 of 337

Long range dependence in South African Platinum prices under heavy tailed error distributions

Kubheka, Sihle (2016-11)

South Africa is rich in platinum group metals (PGMs) and these metals are important in providing jobs as well as investments some of which have been seen in the Johannesburg Securities Exchange (JSE). In this country this ...
Local properties of graphs

De Wet, Johan Pieter (2016-10)

We say a graph is locally P if the induced graph on the neighbourhood of every vertex has the property P. Specically, a graph is locally traceable (LT) or locally hamiltonian (LH) if the induced graph on the neighbourhood ...
Joint longitudinal data analysis in detecting determinants of CD4 cell count change and adherence to highly active antiretroviral therapy at Felege Hiwot Teaching and Specialized Hospital, North-west Ethiopia (Amhara Region)

Seyoum, Awoke; Ndlovu, Principal; Temesgen, Zewotir (2017-03-16)

Abstract Background Adherence and CD4 cell count change measure the progression of the disease in HIV patients after the commencement of HAART. Lack of information about ...
Understanding patterns of aggregation in count data

Sebatjane, Phuti (2016-06)

The term aggregation refers to overdispersion and both are used interchangeably in this thesis. In addressing the problem of prevalence of infectious parasite species faced by most rural livestock farmers, we model the ...
Some properties of the Kermack-McKendrick epidemic model with fractional derivative and nonlinear incidence

Doungmo Goufo, Emile F; Maritz, Riëtte; Munganga, Justin (2014-10-30)

Abstract Kermack-McKendrick epidemic model is considered as the basis from which many other compartmental models were developed. But the development of fractional calculus applied to mathematical epidemiology ...
Photoluminescence Quenching and Enhanced Optical Conductivity of P3HT-Derived Ho3+-Doped ZnO Nanostructures

Kabongo, Guy L; Mbule, Pontsho S; Mhlongo, Gugu H; Mothudi, Bakang M; Hillie, Kenneth T; Dhlamini, Mokhotjwa S (2016-09-20)

Abstract In this article, we demonstrate the surface effect and optoelectronic properties of holmium (Ho3+)-doped ZnO in P3HT polymer nanocomposite. We incorporated ZnO:Ho3+ (0.5 mol% Ho) nanostructures in ...
Long memory mean and volatility models of platinum and palladium price return series under heavy tailed distributions

Ranganai, Edmore; Kubheka, Sihle B (2016-12-09)

Abstract South Africa is a cornucopia of the platinum group metals particularly platinum and palladium. These metals have many unique physical and chemical characteristics which render them indispensable to ...
The analysis of a reactive hydromagnetic internal heat generating poiseuille fluid flow through a channel

Hassan, A. R; Maritz, R. (2016-08-11)

Abstract In this paper, the analysis of a reactive hydromagnetic Poiseuille fluid flow under different chemical kinetics through a channel in the presence of a heat source is carried out. An exothermic reaction ...
On studentized residuals in the quantile regression framework

Ranganai, Edmore (2016-08-02)

Abstract Although regression quantiles (RQs) are increasingly becoming popular, they are still playing a second fiddle role to the ordinary least squares estimator like their robust counterparts due to the ...
On the existence of solution for fractional differential equations of order 3 < δ 1 ≤ 4 $3<\delta_{1}\leq4$

Baleanu, Dumitru; Agarwal, Ravi P; Khan, Hasib; Khan, Rahmat A; Jafari, Hossein (2015-11-26)

Abstract In this paper, we deal with a fractional differential equation of order ...
On existence results for solutions of a coupled system of hybrid boundary value problems with hybrid conditions

Baleanu, Dumitru; Khan, Hasib; Jafari, Hossein; Khan, Rahmat A; Alipour, Mohsen (2015-10-15)

Abstract We investigate sufficient conditions for existence and uniqueness of solutions for a coupled system of fractional order hybrid differential equations (HDEs) with multi-point hybrid boundary conditions ...
Existence criterion for the solutions of fractional order p-Laplacian boundary value problems

Jafari, Hossein; Baleanu, Dumitru; Khan, Hasib; Khan, Rahmat A; Khan, Aziz (2015-09-17)

Abstract The existence criterion has been extensively studied for different classes in fractional differential equations (FDEs) through different mathematical methods. The class of fractional order boundary ...
Quasi-Poisson versus negative binomial regression models in identifying factors affecting initial CD4 cell count change due to antiretroviral therapy administered to HIV-positive adults in North–West Ethiopia (Amhara region)

Seyoum, Awoke; Ndlovu, Principal; Zewotir, Temesgen (2016-11-09)

Abstract Background CD4 cells are a type of white blood cells that plays a significant role in protecting humans from infectious diseases. Lack of information on associated ...
Quasi-orthogonality and real zeros of some 2F2 and 3F2 polynomials

Johnston, Sarah Jane; Jordaan, Kerstin (Elsevier, 2015)

In this paper, we prove the quasi-orthogonality of a family of 2F2 polynomials and several classes of 3F2 polynomials that do not appear in the Askey scheme for hypergeometric orthogonal polynomials. Our results include, ...
Variants of P-frames and associated rings

Nsayi, Jissy Nsonde (2015-12)

We study variants of P-frames and associated rings, which can be viewed as natural generalizations of the classical variants of P-spaces and associated rings. To be more precise, we de ne quasi m-rings to be those rings ...
2-ARYL-6,8-Dibromoquinolinones as synthons for the synthesis of Polysubstituted 4-ARYL-6-Oxopyrrolo [3,2,1-ij] Quinolines

Oyeyiola, Felix Adetunji (2015-09)

The known 2-aryl-6,8-dibromo-2,3-dihydroquinolin-4(1H)-ones 122 were dehydrogenated using thallium(III) p-tolylsulfonate in dimethoxyethane under reflux to afford the 2-aryl-6,8-dibromoquinolin-4(1H)-ones 136. Palladium-catalyzed ...
Statistical modeling of unemployment duration in South Africa

Nonyana, Jeanette Zandile (2015-12)

Unemployment in South Africa has continued to be consistently high as indicated by the various reports published by Statistics South Africa. Unemployment is a global problem where in Organisation for Economic Co-operation ...
Dynamics of the breakup of two-body halo nuclei

Mukeru, Bahati (2015-06)

In this thesis, the first-order and higher-order interferences on the total (Coulomb+nuclear), Coulomb and nuclear breakup cross sections in the 15C+208Pb, 11Be+208Pb breakup reactions are first studied at 68 MeV/u ...
Synthesis and characterization of long persistent phosphors using combustion method

Colen, Manaka Mmakgabo (2015)

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 ...
Algebraic and multilinear-algebraic techniques for fast matrix multiplication

Gouaya, Guy Mathias (2015)

This dissertation reviews the theory of fast matrix multiplication from a multilinear-algebraic point of view, as well as recent fast matrix multiplication algorithms based on discrete Fourier transforms over nite ...

Recently added

School of Science: Recent submissions

Search UnisaIR

Browse

All of UnisaIR

This Community

My Account