Some general convergence theorems on fixed points

In this thesis, we first obtain coincidence and common fixed point theorems for a pair of generalized non-expansive type mappings in a normed space. Then we discuss two types of convergence theorems, namely, the convergence of Mann iteration procedures and the convergence and stability of fixed points. In addition, we discuss the viscosity approximations generated by (ψ ,ϕ)-weakly contractive mappings and a sequence of non-expansive mappings and then establish Browder and Halpern type convergence theorems on Banach spaces. With regard to iteration procedures, we obtain a result on the convergence of Mann iteration for generalized non-expansive type mappings in a Banach space which satisfies Opial's condition. And, in the case of stability of fixed points, we obtain a number of stability results for the sequence of (ψ,ϕ)- weakly contractive mappings and the sequence of their corresponding fixed points in metric and 2-metric spaces. We also present a generalization of Fraser and Nadler type stability theorems in 2-metric spaces involving a sequence of metrics

Radiative forcing of black carbon over Delhi

The radiative effects of black carbon (BC) aerosols over New Delhi, the capital city of India, for the period August 2010–July 2011, have been investigated using Santa Barbara DISTORT Atmospheric Radiative Transfer (SBDART) model in the present paper. The monthly mean BC concentrations in Delhi, an urban location, vary in between 15.935 ± 2.06 μg m−3 (December 2010)–2.44 ± 0.58 μg m−3 (July 2011). The highest value for monthly mean BC forcing has been found to be in November 2010 (66.10 ± 6.86 Wm−2) and the lowest in July 2011 (23 ± 3.89 Wm−2). Being the host city for the XIX Commonwealth Games (CWG-2010), government of Delhi set up a plan to reduce emissions of air pollutants during Games, from 03 October to 14 October, 2010. But opposite to the expectations, the emission controls implemented were not sufficient to reduce the pollutants like black carbon (BC), and therefore relatively a high value of BC radiative forcing (44.36 ± 2.4) was observed during the month of October 201

Antecedents of Blackboard Adoption by Lecturers at a South African Higher Education Institution – Extending GETAMEL

Learning Management Systems (LMS) have become central to the teaching and learning in Higher Education Institutions (HEI). The aim of this paper was to test the constructs of the General Extended Technology Acceptance Model for e-Learning (GETAMEL) and some selected constructs from the other Technology Acceptance Models (TAM) on adoption and use of Black-board LMS by lecturers at a selected university in South Africa. A cross sec-tional electronic survey was carried out to obtain data from 101 lecturers, who were conveniently sampled to express their perceptions on BLMS. Structural equation modelling, utilising SmartPLS3, was used to analyse the collected data. The results confirmed that behavioural intention (BI) influ-enced actual use whilst BI in turn was influenced by perceived usefulness (PU) and subjective norm (SN). Attitude was influenced by PU but had no significant effect on BI. The external factors that influenced perceived ease of use (PEOU) included perceived enjoyment (ENJOY), system self-efficacy (SE), and system anxiety (ANX) whilst PU was influenced by job relevance (JR) and PEOU. University management at the HEI under study should con-sider the determinants of SE, ENJOY and ANX if they need effective utilisation of Blackboard by the lecturers. The study findings imply that a LMS that is adopted and used is one that is considered useful, otherwise users will be reluctant to use it. The findings can assist HEIs in preparing their lecturers before implementation of any e-learning systems, such as training and technical support, thus, enhancing LMS adoption and utilisation. This study contributes to the body of knowledge on antecedents of LMS adoption and use. In addition, it establishes the applicability of GETAMEL in a South African university context

Radiative Forcing of Black Carbon over Delhi

The radiative effects of black carbon (BC) aerosols over New Delhi, the capital city of India, for the period August 2010–July 2011, have been investigated using Santa Barbara DISTORT Atmospheric Radiative Transfer (SBDART) model in the present paper. The monthly mean BC concentrations in Delhi, an urban location, vary in between 15.935 ± 2.06 μg m−3 (December 2010)–2.44 ± 0.58 μg m−3 (July 2011). The highest value for monthly mean BC forcing has been found to be in November 2010 (66.10 ± 6.86 Wm−2) and the lowest in July 2011 (23 ± 3.89 Wm−2). Being the host city for the XIX Commonwealth Games (CWG-2010), government of Delhi set up a plan to reduce emissions of air pollutants during Games, from 03 October to 14 October, 2010. But opposite to the expectations, the emission controls implemented were not sufficient to reduce the pollutants like black carbon (BC), and therefore relatively a high value of BC radiative forcing (44.36 ± 2.4) was observed during the month of October 2010

Antecedents of Blackboard Adoption by Lecturers at a South African Higher Education Institution – Extending GETAMEL

Learning Management Systems (LMS) have become central to the teaching and learning in Higher Education Institutions (HEI). The aim of this paper was to test the constructs of the General Extended Technology Acceptance Model for e-Learning (GETAMEL) and some selected constructs from the other Technology Acceptance Models (TAM) on adoption and use of Black-board LMS by lecturers at a selected university in South Africa. A cross sec-tional electronic survey was carried out to obtain data from 101 lecturers, who were conveniently sampled to express their perceptions on BLMS. Structural equation modelling, utilising SmartPLS3, was used to analyse the collected data. The results confirmed that behavioural intention (BI) influ-enced actual use whilst BI in turn was influenced by perceived usefulness (PU) and subjective norm (SN). Attitude was influenced by PU but had no significant effect on BI. The external factors that influenced perceived ease of use (PEOU) included perceived enjoyment (ENJOY), system self-efficacy (SE), and system anxiety (ANX) whilst PU was influenced by job relevance (JR) and PEOU. University management at the HEI under study should con-sider the determinants of SE, ENJOY and ANX if they need effective utilisation of Blackboard by the lecturers. The study findings imply that a LMS that is adopted and used is one that is considered useful, otherwise users will be reluctant to use it. The findings can assist HEIs in preparing their lecturers before implementation of any e-learning systems, such as training and technical support, thus, enhancing LMS adoption and utilisation. This study contributes to the body of knowledge on antecedents of LMS adoption and use. In addition, it establishes the applicability of GETAMEL in a South African university context