The characterisation of a two stage flotation circuit treating a complex platinum and chromite ore

Bibliography: pages [144]-152.The methodology was developed to characterise the complex MF2 circuit at Impala Platinum Ltd. The circuit was divided into individual units and each unit was evaluated over a period of time. The performance of each unit in terms of platinum, palladium, rhodium and chromite recoveries was determined by sampling around the unit. The changes in ore floatability characteristics were monitored by carrying out batch flotation tests on samples taken from the feed to each unit. The mixing in the units was characterised by performing residence time distribution studies on the units. The batch flotation results were modelled using a distributed rate approach. The model yielded parameters which were associated with three floatability classes, viz. a fast floating, a medium floating and, a slow floating class and a class for valuable minerals which did not float. The model was not able to discriminate between mineralogical and particle size effects on flotation rates. This would be an important prospect of a future investigation. The rate constants associated with each floatability fraction obtained from the batch flotation together with residence time distribution results were used in association with the actual recoveries from each unit. These factors were used to simulate the performance of the circuit. The same model was used for all the units and the differences in cell design as indicated by hydrodynamics, aeration rate, etc. were accounted for in the· mixing parameters and flotation rates. This procedure to simulate plant performance was successfully applied to three different circuits thus confirming its validity. The difference in the three simulated circuits was in the cleaning stages. Among other things, the simulation shows that the best ·platinum, palladium and rhodium recoveries could be obtained if the greatest cleaning capacity was situated in the secondary stage of the circuit. Although the changes in the circuit configuration could be simulated to establish the effect on the platinum, palladium and rhodium recoveries, the chromite recovery could not be simulated. This is due to the fact that chromite is mainly floated by entrainment which is not incorporated into the model. Since the chromite recovery is crucial for the design of optimum cleaning circuits in the flotation of UG-2 ore, research needs to be done to quantify the entrainment phenomenon

Can a web-based community of practice be established and operated to lead falls prevention activity in residential care?

The aims of this study were to evaluate establishing and operating a web-based community of practice (CoP) to lead falls prevention in a residential aged care (RAC) setting. A mixed methods evaluation was conducted in two phases using a survey and transcripts from interactive electronic sources. Nurses and allied health staff (n = 20) with an interest in falls prevention representing 13 sites of an RAC organization participated. In Phase 1, the CoP was developed, and the establishment of its structure and composition was evaluated using determinants of success reported in the literature. In Phase 2, all participants interacted using the web, but frequency of engagement by any participant was low. Participatory barriers, including competing demands from other tasks and low levels of knowledge about information communication technology (ICT) applications, were identified by CoP members. A web-based CoP can be established and operated across multiple RAC sites if RAC management support dedicated time for web-based participation and staff are given web-based training

The effect of complex falls prevention interventions on falls in residential aged care settings: A systematic review protocol

The objective of this review is to synthesize the best available evidence on the effectiveness of complex falls prevention interventions on fall reductions in the residential aged care population, implemented at two or more of the following levels: organization, facility or resident. Specifically the review question is: What is the effect of complex falls prevention interventions on falls in residential aged care settings

Globalizing Terror

The globalization of terror is something new. It goes hand in hand with the globalization of the media. The creation of new media technology has created a public space in which political actors may perform: Terrorists are some of the actors who can now play on a global stage. Kosovo, Israel/Palestine, the twin towers terror is not a sometime thing. Man's inhumanity toward his fellow men makes terror a constant in human affairs. Not very long ago most of the terror was hidden beyond our willingness to wait for the news. That is no longer true. We experience the terror around the world

Globalizing Resistance: Global Media and the Political Psychology of Oppression and Resistance

On September 30, 2005 a large Danish newspaper published a set of twelve cartoons picturing the prophet Muhammad. The text was about freedom of the press; the cartoons, which the author knew would anger Muslims, were to demonstrate freedom as it was being exercised by the newspaper. Thirteen days later Al Jazeera's English language website contained a brief report about a protest by Muslim organizations in Denmark. Then nothing until the end of January 2006 when there was an explosion of news reporting about protests by Muslim communities demanding an apology for the desecration of their leader and their faith.We use this episode to examine the interaction of reporting and protest in the global domain

Global Media Diplomacy and Iranian Nuclear Weapons

Diplomacy at the start of the 21st century occurs as part of a highly complex global system, both openly and behind closed doors, publicly and and privately. Political actors use the media, and media actors use the politicians to advance their interests in different ways. The question today is not whether or not there shall be diplomatic publicity, but rather who does it where, when, why, and how. The case of Iranian nuclear weapons shows globalizing media and political elites using new technologies as part of a dynamic and sophisticated diplomatic process. Diplomacy behind closed doors is not replaced by the interactions in the global media. But pluralistic global media communication adds a new dimension to diplomatic activity, making it more accessible, dynamic, and complex

Studies of War and Peace: Summary of an Academic Career

A personal profile that summarizes the academic career and research findings of the author

Evaluation of older people\u27s knowledge, awareness, motivation and perceptions about falls and falls prevention in residential aged care homes: A tale of two cities

Falls prevention strategies can only be effective in reducing falls amongst older people if they are adopted and enacted in their daily lives. There is limited evidence identifying what older people in residential aged care (RAC) homes understand about falls and falls prevention, or what may limit or enable their adoption of strategies. This study was conducted in two countries and explored older people’s knowledge and awareness of falls and their preferences, opportunities and motivation to undertake falls prevention strategies. A cross-sectional survey was administered to participants (N = 70) aged 65 years and over, living in six RAC homes in Perth, Australia and six RAC homes in Swansea, Wales, United Kingdom. Participants had limited knowledge about intrinsic falls risk factors and strategies to address these and frequently expressed self-blame regarding falling. Almost all (N = 67, 95.7%) participants felt highly motivated to maintain their current functional mobility and independence in everyday tasks. Key preferences for receiving falls prevention messages favoured a positive approach promoting wellness and independence (N = 41, 58.6%) via pictorial posters or brochures (N = 37, 52.9%) and small group discussions preferably with demonstrations (N = 18, 25.7%). Findings from this study may assist organisations and staff to more effectively engage with older people living in RAC about falls prevention and design targeted resources to address the motivations and preferences of this population

Evaluating the impact of operating a falls prevention community of practice on falls in a residential aged care setting

Background/Purpose: Falls are a leading adverse event in residential aged care (RAC) settings with prevention a global aim. The purpose of this study was to determine whether operating a falls prevention community of practice (CoP) delivering evidence-based prevention interventions could change the rate of falls and injurious falls in a RAC setting. Methods: A prospective quasi-experimental pre/post design was conducted. Participants were 13 RAC sites (779 beds) of a single RAC organization, with 20 multidisciplinary staff volunteering as CoP members. Results: Falls rates pre CoP were 10.1/1,000 occupied bed days (OBD) compared with 10.9 /1,000 OBD post CoP operation [coefficient 0.7, 95% CI -33.5, 34.9 (p=0.967)]. This was confounded by identified differences and changes in defining falls between sites. The rate of injurious falls resulting in fractures pre CoP was 0.2/1,000 OBD compared with 0.1/1,000 OBD post CoP; [coefficient -0.3, 95% CI -1.1, 0.4 (p=0.423)]. Conclusion: A falls prevention CoP operating for 18 months was unable to reduce falls rates in that time frame but there was a trend to a reduction in falls resulting in fracture. Additional time for implementation and evaluation of falls prevention interventions will be required in complex settings, such as RAC organizations, in the absence of additional funding. Valid comparisons of falls rates and injurious falls rates within the RAC population require the adoption of standardized definitions to improve reporting reliability