Interim : Interdisciplinary Journal - Volume 14, Issue 2, 2015
Volume 14, Issue 2, 2015
Source: Interim : Interdisciplinary Journal 14, pp 143 –152 (2015)More Less
Public parks (PP) and open recreational facilities are essential elements in cities particularly in the residential areas. Evidence from literature suggests that PPs have a positive influence on the social and physical health of the people who have access to them. Although, PPs have been located in the residential areas of South Africa according to urban planning guidelines and rules, they are observed to be underutilised. Many factors including location, accessibility, and social issues like crime or fear of crime, life style, and lack of time are generally attributed for such a scenario. Therefore, the objective of this study is to explore how illumination levels in the public parks influence the utilisation of public parks in the residential areas of South African cities. The investigation was conducted by using Bloemfontein city as a case study following a survey research method. The study revealed that more people use the PPs during evening hours, higher illumination is one of the most important factors that contributes to the accessibility of the PPs in the residential areas and the utilisation of parks are enhanced with higher level of artificial illumination.
Source: Interim : Interdisciplinary Journal 14, pp 153 –163 (2015)More Less
Technical network reliability in electrical distribution networks and the improvement thereof will always be part of utilities and the electricity supply industry. One of the key reliability improvement strategies is additional recloser (breaker) installation on medium voltage networks.
The effect of recloser placement on network reliability is investigated. A method of cost-benefit analysis (CBA) is explored, explained and used to analyse the placement of additional reclosers in electrical networks. Costs and benefits are shown to be different when viewed from the perspective of the utility against that of the customer, and this ultimately influence the placement of a newly planned breaker.
Examining the relationship between abstract thinking ability and academic performance in object oriented programming : a psychometric and theoretical analysis of student capacitySource: Interim : Interdisciplinary Journal 14, pp 164 –175 (2015)More Less
Abstract reasoning involves flexible thinking as well as solving problems creatively and logically. Evidence suggest that especially first year students that undertake Information Technology studies at institutions of higher education, find it challenging to successfully comprehend concepts regarding object oriented programming (OOP). This study is based on the hypothetical premise that student performance regarding OOP can be linked to the abstract thinking ability of the particular student because of the highly abstract nature of OOP concepts. A comparison between psychometric test results gauging abstract thinking abilities of students and student performance in OOP are also presented and argued.
Source: Interim : Interdisciplinary Journal 14, pp 176 –187 (2015)More Less
The paper presents the application of World Bank's Model RONET to optimize strategic management system for Lesotho roads network. The Lesotho road network condition deteriorated considerably during the 2000s due to underfinancing of operations and maintenance. In recent years, as the financial situation in Lesotho has improved, financing for the road sector has gradually increased, focusing on the most hazardous and highly trafficked parts of the road network. However, the overall budget allocated to the sector remains inadequate to maintain the entire district road network in a stable condition. This research is going to present the application of World Bank's model Road Network Evaluation Tool (RONET) to strategic network level analysis of the Lesotho road network. The goals of the presented study are to obtain the optimum maintenance and rehabilitation strategy and related budget, estimate the impact of different funding levels on the future quality and estimate the economic consequences of budget constraints.
The application of RONET model will lead to an optimal maintenance and rehabilitation strategy with a good balance between rehabilitation, periodic and recurrent maintenance. The implementation of optimal maintenance and rehabilitation strategy would cause major improvement compared to current condition of the network. Implementation of higher than optimal maintenance and rehabilitation leads to substantially higher roads directorate costs and consequently lower net benefits, while the implementation of the lower than optimal maintenance and rehabilitation standards would lead to considerably worse network condition for slightly lower agency costs. This means that even minor budget constraints would result in considerably higher total road transport costs in the country's economy.
Author M. Van Der MeschtSource: Interim : Interdisciplinary Journal 14, pp 188 –196 (2015)More Less
This paper contains research performed on the effects of capacitive coupling on overhead power lines under loss of phase conditions in an earthed system. The research was triggered by a contact incident which occurred on a 11kV overhead line during unplanned maintenance performed under live conditions.
Source: Interim : Interdisciplinary Journal 14, pp 197 –206 (2015)More Less
Fly Ash is a residue generated by coal combustion and abundantly available, but due to potentially toxic elements found in Fly Ash, is considered harmful to the environment. The objective of this study is to evaluate the environmental effects of fly ash used as a stabilization agent in road pavement construction. Using laboratory-testing specimens of fly ashes namely, Kendal Dump Ash, Durapozz and Pozzfill, stabilized with classified G5 material and 1% AFRISAM and LAFARGE cement respectively and leach testing done to evaluate chemical leach properties over time and the harmful effects it has on the environment. Laboratory leaching sample results have indicated that Fly Ash constituents exhibit limited mobility. The study revealed that Fly Ash is an environmental option and has engineering advantages when used properly for soil stabilization techniques.
Validating the optimum tilt angle for PV modules in the central region of South Africa for the winter seasonAuthor P.E. HertzogSource: Interim : Interdisciplinary Journal 14, pp 207 –220 (2015)More Less
Optimizing the output power of any PV module involves a number of factors, including the setting of the tilt angle. The purpose of this paper is to present empirical evidence validating the optimum tilt angle for PV module installations in semi-arid regions of South Africa for the winter season. The experimental setup includes three identical PV systems where the PV modules where set to different tilt angles as stipulated in the literature. Data was recorded from May to July 2015 using an Arduino board and LabVIEW software. Two power measurements were used to validate the optimum tilt angle as being Latitude plus 10° for the winter season.
Source: Interim : Interdisciplinary Journal 14, pp 221 –232 (2015)More Less
Stakeholders in the construction sector are placing a much stronger emphasis on the importance of attaining sustainability within the industry. While much efforts has been deployed towards attaining sustainable development through infrastructural projects, the methods used by most stakeholders for projects procurement hinders the attainment of criteria for sustainability. The proposed research will thus explore how to evolve a mechanism for promoting lean sustainable construction with infrastructure projects in South Africa. The study is primarily to assess the components of the framework required for the integrative implementation of lean and sustainability concepts in an infrastructure project. The study is qualitative in nature, based on interpretative theoretical framework that is grounded in literatures in the field of built-environment. Emergent findings indicate that a case study approach and specifically, qualitative comparative analysis (QCA) research approach provide answers to the research questions, which are domiciled in a complex socio-technical environment. The evolution of the mechanism shall focus on lean construction and sustainability methods / tools that support the elimination of wastes in work processes, work methods, work culture and materials issues, thereby promoting energy and resource efficiency. It is expected that the framework that will leads to continuous improvement in the areas of energy and resource efficiency, minimization of emission (Co2) from the built environment, improvement in stakeholders working relationships and social benefits to the community, among others.
Author T. BihiSource: Interim : Interdisciplinary Journal 14, pp 233 –241 (2015)More Less
The development of a Machine Vision system involved the selection of various components that will work together in order to solve a vision problem. The vision system was tasked with verifying reconfiguration and the position of devices within the assembly system, as well as inspecting the product for defects that infringe on its quality. The aim in this article is to discuss the control and setup of the multiple vision inspections that the vision system had to perform in order to solve the assembly systems verification and quality assurance problem.
Source: Interim : Interdisciplinary Journal 14, pp 242 –250 (2015)More Less
Innovative software applications may prove to be advantageous in a teaching environment. It has been proven that technological teaching produces better achievement in class and an increased interest in the relevant field of teaching. Software that is able to produce a basic geotechnical report will give civil engineering students an insight into the field of geotechnical engineering and an understanding of the relevant inputs required and the outputs generated. A fundamental understanding of site investigations and related reports is an important aspect of geotechnical engineering training.
Implications of population parameters in predicting periodic tendencies within an age-structured population model with a Shepherd recruitment functionSource: Interim : Interdisciplinary Journal 14, pp 251 –284 (2015)More Less
An algorithm for calculating the evolutionary stable strategy for an age-structured population model with a Shepherd recruitment functionSource: Interim : Interdisciplinary Journal 14, pp 285 –315 (2015)More Less