Hidden treasures in Ivory Towers : the potential of university art collections in South Africa, with a case study of UCT

Includes bibliographical references (leaves 117-123).This dissertation takes as its central theme the context of a university as a setting for artworks. While globally many university art collections enjoy prominent status in their communities, and are well endowed and visited, their South African counterparts are sorely underused and valued. Thus, the aim of the study is twofold; in the first instance, an argument is made for the positive and productive role South African university art collections can play within their society - and primary research reveals the rich and varied collections held throughout the country. The second focus is on one particular case study: the University of Cape Town (UCT) art collection, and the acquisition body that oversees it, the Works of Art Committee (WOAC). Through a detailed analysis of this committee's thirty-year archive, and informed by the experience of an extensive internship with the WOAC, the study provides an overview of their operation, assessing their successes and failures. What is revealed is that there are numerous problems inherent within the way in which this committee is run, and the management of the art collection in general. Aside from compositional issues within the committee itself, the fact that there is no educational integration between the collection and the university community, is highly problematic. As such, numerous suggestions are offered, with the hope that the collection can become a more meaningful presence to those on campus, and beyond. For, with a far healthier acquisition budget than the South African National Gallery, and access to a large and diverse audience, it seems as though a highly exciting opportunity is being overlooked

The development of a continuous reactor for the acid hydrolysis of cellulose and its application to refuse disposal

Refuse disposal in metropolitan areas is becoming increasingly difficult and expensive as ever-greater volumes of waste need to be transported to increasingly remote landfill sites. Acid hydrolysis offers an attractive alternative means of disposal, by aiming to convert the cellulose in the waste to glucose, for fermentation to ethanol. Recent research into the hydrolysis of cellulose at elevated temperatures and short reaction times has shown that high yields of glucose may be obtained: but experimental work with refuse has been lacking. This work describes the development of a continuous reactor for carrying out the hydrolysis of refuse under the conditions required for the determination of reaction rate data. An existing rig was modified through a series of preliminary experiments: after this, detailed testwork was carried out with filter paper, newsprint and air-classified lights of municipal refuse as cellulosic substrates, as well as pure glucose, to investigate the decomposition reaction. High yields of glucose were obtained from experiments with newsprint and refuse, and the kinetic parameters derived were compared with those of previous researchers. The data obtained from the hydrolysis of the refuse sample was used-to draw up a preliminary design of a 500 tonne/day plant to treat the air- classified light fraction of municipal refuse. The initial capital investment was estimated to be f8.1 million, and under present market conditions, it was shown to be advantageous to convert the cellulosic fraction of refuse into ethanol rather than RDF pellets. A rough estimate of a complete process to produce ethanol from untreated refuse indicated that considerable savings in overall disposal costs could be made, compared with disposing of the waste in the usual way, by landfilling after shredding or pulverisation

Heap leaching technology – current state, innovations and future directions: A review

Copyright © 2015 Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Mineral Processing and Extractive Metallurgy Review on 20 November 2015, available online: http://www.tandfonline.com/10.1080/08827508.2015.1115990Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited. However, despite much progress since it was first applied in recent times, the process remains limited by low recoveries and long extraction times. It is becoming increasingly clear that the choice of heap leaching as a suitable technology to process a particular mineral resource, which is both environmentally sound and economically viable, very much depends on having a comprehensive understanding of the underlying fundamental mechanisms of the processes and how they interact with the particular mineralogy of the ore body under consideration. This paper provides an introduction to the theoretical background of various heap leach processes, offers a scientific and patent literature overview on technology developments in commercial heap leaching operations around the world, identifies factors that drive the selection of heap leaching as a processing technology, describes challenges to exploiting these innovations, and concludes with a discussion on the future of heap leaching.South Africa Research Chair Initiative (SARChI) - Chair in Mineral BeneficiationNational Research Foundation (NRF) of South Africa - Research Niche Area (RNA) gran

Profiling the Gen Y tourist

Although Generation Y (Gen Y) is seen as an important and influential travel market, it has not featured heavily within academic tourism literature. Therefore, this study seeks to assist with building a profile for the Gen Y tourist. It examines the preferences and behaviors of this cohort; specifically, the sources of information they use and the research they conduct prior to their travels. Data were collected from students studying at a large public university in the United States. Overall, the study found the participants had a preference for shorter vacations, and many had traveled internationally. There was also a direct relationship between a person\u27s previous travel history and year of study with the amount that they traveled. Furthermore, participants placed a high level of importance on conducting research prior to their departure, namely listening or reading the news and looking at weather forecasts

Investigation of the effect of mineralogy as rate-limiting factors in large particle leaching

Although heap leaching is by now well established in the mining industry, the process remains limited by low recoveries with different rate-limiting factors that are not clearly understood. In this study, three large particle size classes (+19/-25, +9.5/-16, +4.75/-5 mm) were prepared from a sphalerite ore by two different methods of comminution (HPGR and cone crusher). The particles were then packed into leach reactors that were operated continuously for eleven months with well-mixed internal circulation of the leach solution. Characterization of the residue of the leach reactors indicated that there are areas within the ore particles where although sphalerite grains are accessible to the solution, they remain unreacted. X-ray tomography and QEMSCAN® analysis of the selected samples before, during and after leaching, showed increased leaching of sphalerite grains associated with pyrite due to galvanic interactions. Mineral chemistry (Fe, Mn content of sphalerite) and jarosite precipitation were also investigated as factors influencing sphalerite leaching

Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles

X-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two different modes of comminution – HPGR at 90 bar and cone crusher – and individual particles were selected from three different size fractions. Investigation of the reacted fraction of Zn vs distance from the centre of each particle indicated that leaching from large particles leads to near complete conversion near the surface, but only partial conversion in the zones that are closer to the centre of particles. The cores of the cone-crushed particles show hardly any conversion at all, especially in the larger particle sizes. Mathematical analysis shows that leaching from the large particle does not follow the shrinking core model. It is shown that the progression can rather be described by a combined reaction-diffusion process progressing through the network of cracks and pores closer to the particle surface. Extent and depth of this network are a function of particle size and comminution method. A simplified rate model is proposed that describes the extent of leaching as a function of time in terms of a set of parameters that can all be related to just particle size and crushing mode

Down the Rabbit Hole

This is the Exhibition Catalogue for a two-part contemporary art exhibition series titled: Down the Rabbit Hole: A Queensland College of Art, Griffith University and University of Southern Queensland Visual Art Research Project. The significance of Down the Rabbit Hole lies in its interpretation and application of creative curiosity within a critical studio-research context. Therefore, the role of practice-led research is poignant to this project, as it adheres to the very notion of experiencing creative curiosity in order to effectively fall into the rabbit hole. It is only through engaging with experience that other worlds can be understood. In this way, creative curiosity becomes an intellectual pursuit; like a riddle that makes sense of what is initially perceived as non-sense. Often, such visual research methods are employed to cautiously interweave intellectual rigour and creative intuition within contemporary art practices. In this exhibition, it could be interpreted that creativity and criticality are intrinsically linked as it showcases not only professional expertise but also new contributions to the visual-art field

Flotation of coal and sulphur from South African ultrafine colliery wastes

Flotation of coal and sulphur from a typical South African ultrafine colliery waste has been achieved in laboratory-scale batch flotation tests, using dodecane, kerosene, and oleic acid as coal collectors, and xanthates to float the sulphide minerals (with the aid of dextrin as a coal depressant). The use of oleic acid as collector, in conjunction with MIBC frother, produced a coal yield of 56 per cent (much more than was obtained with dodecane or kerosene) at an ash content of 18 per cent, from a feed ash of 34.4 per cent; and a low- sulphur tailings. Sulphide flotation using potassium xanthate (PAX) recovered 26.3 per cent of the total sulphur in the concentrate. Staged addition of xanthate increased the total sulphur recovery to 42.1 per cent and reduced the sulphur content of the tailing further

Examining Student Wellness for the Development of Campus-Based Wellness Programs

Background: Despite the many campus-based wellness programs and services offered through entities such as student services, many U.S. students lack the strategies, skills, or support systems to manage stress or change pre-existing behaviors, resulting in unhealthy behaviors and poor overall wellness. Since patterns developed during this time can form a solid foundation for future health behaviors, there is a need to develop and design wellness programs that stimulate positive health-behavior change.Aim: The purpose of this study was to assess student wellness of college students at a four-year public university to inform campus-based health programs, events, and services.Methods: An anonymous, single-structured survey was administered at an on-campus event (N = 225). The instrument covered six dimensions of wellness: physical wellness, social wellness, intellectual wellness, emotional wellness, spiritual wellness, and environmental wellness.Results: Significant differences for gender were found in the dimensions of social wellness, emotional wellness, and physical wellness.  Females reported higher levels of social and emotional wellness, while males reported higher levels of physical wellness. Differences in age for emotional wellness, and year of study for physical wellness were also found.Conclusions: Findings provide insight to direct interventions and programs that would enhance students' wellness knowledge and behaviors

Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps

The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the heap leach process, can take place on the particles with partial exposure of mineral grains, if it can provide sufficient surface front for chemical attack by leaching solution. The aim of this study was to assess the benefits of high crack density in the ore particles produced using the HPGR and how it could diminish due to inadequate percolation of the leaching agent. A zinc ore was comminuted using HPGR at three different pressure settings and with a cone crusher for the control experiment. Subsamples from the (+23/-25, +14/-16, +5.25/-6.75 mm) size fractions were characterized and packed into leach reactors. The reactors were stopped from time to time to investigate the progress of crack and micro-crack growth and its effect on metal extraction using the X-ray computed tomography (CT). The results are validated with those obtained using traditional techniques such as SEM and QEMSCAN. Investigation of the leach reactors residue indicated significant changes in the particle size distribution (PSD) of initial feed toward the fine size fraction. The residues from the reactors leaching the material prepared using the HPGR product contained more fine particles than the reactors, which were fed by cone crusher product. These differences were up to 10.3%