Status of tailings dumps : let D5s go working in the past?

It was decided in the De Beers v Ataqua Mining (Pty) Ltd that \u27\u27tailings dumps\u27\u27 created by mining companies before the Mineral and Petroleum Resources Development Act, 28 of 2002 (&quot;the MPRDA&quot;) came into operation are not governed by its provisions because such dumps are not &quot;residue stockpiles&quot; or &quot;residue deposits&quot; for purposes of the MPRDA. Ownership of tailings dumps is determined by the common law principles of accession. Ownership of a movable dump has to be transferred by one of the recognised forms of delivery of movables. Processing of these dumps will, however, still be subject to compliance with South African environmental, health and safety laws in general. It is submitted that mine dumps or tailings dumps created upon the exercise of &quot;old order mining rights&quot; before the commencement of the MPRDA and even after commencement of the MPRDA until eventual termination of the &quot;old order mining rights&quot; are not subject to the extensive, mining, environmental, empowerment provisions of the MPRDA. Termination of &quot;old order mining rights&quot; takes place upon: (i) refusal of an application for conversion of a mining right during (or even after) the period of transition, (ii) conversion into and registration of new order mining rights during (or even after) the period of transition or (iii) termination of unconverted &quot;old order mining rights&quot; on 30 April 2009. To the extent that this decision has made it possible to embark on a shorter and less cumbersome route in the reprocessing and eventual disappearance of most tailings dumps, it is to be welcomed from an economical, environmental, job creation and aesthetic perspective. Proposed amendments to the MPRDA to undo the impact of the De Beers decision should be carefully considered against these mentioned benefits and a possible finding that it may amount to an expropriation without compensation. <br /

Knowledge sharing in a globally dispersed engineering service company

This qualitative and naturalistic approach to the study explores how interaction and trust can be promoted in virtual teams and the main drivers for these teams to behave in certain ways. This study focuses on a single multinational engineering service company. Multinational engineering companies are increasingly becoming more involved in international projects that are globally dispersed and complex. In order to achieve its objectives and service clients globally, flexible and dynamic organisational structures are required to meet the requirements of the competitive marketplace. The advances and development in ICT systems has allowed the establishment of virtual teams whose members make use of these systems to communicate and share information. The challenge to team building in a virtual environment is that of creating avenues and opportunities for team members to have the level and depth of dialogue necessary to create a shared future. Issues of cultural diversity, geographic distance and member isolation can increase the challenges to effective collaboration. This study investigates real organisational virtual teams in the engineering service industry. It enriches the knowledge management literature by introducing the practice perspective of interaction and collaboration in virtual teams, and explores knowledge transfer attributes and variables of virtual teams more fully. The study adds to the operational management literature by elaborating organisational structures to facilitate knowledge sharing, and presenting important knowledge management concern associated with collaboration by means of globally dispersed virtual teams. Data was collected through in-depth interviews and a web-based survey. The aim of the study was to determine how interaction and trust can be promoted in virtual teams and the main drivers for these teams to behave in certain ways. In particular the study focuses to what extent interaction, collaboration and trust in virtual teams can be promoted and ways communication tools measure, strengthen, recognize, and capture virtual domain development. The study’s second objective identifies in what way virtual teams contribute to organizational-level learning and knowledge management, and implications for competitive advantage and overall profitability. The third objective of the study identifies specific needs for unique and innovative tools to locate engineering and technical resources, and the importance of using as many tools as possible. This study confined itself to an exploratory interpretive approach aimed at expanding the understanding of some elements that may affect virtual teams. The study limitations include the time available to conduct the survey, the sincerity or truthfulness of the respondents during interviews and the survey, relative small sample size for the industry and the validity of the research questions asked. The author may also present some bias in the research findings and conclusions. It was further assumed that the respondents would openly and honestly answer the research questions. This study highlights the advantage of virtual teams over FTF team and the significance of trust in a virtual team compared to FTF teams. The effectiveness of communication tools as a trust mechanism in the virtual team setting is questioned and emphasises the significance of FTF interaction at the start of the project. Trust is preserved by open, clear and honest communication and not necessarily a functionality of the tools. Other aspects such as integrity, timely feedback, achievement of project objectives and securing of information were reported as a way to ensure trust in a team. The prompt sharing of information and regular communications was identified as mutually beneficial to team members. Virtual teams also have the ability to increase the overall profitability of the company by improved efficiency, shared resources and overall cost reduction. The results of the study revealed that culture diversity had little effect on knowledge sharing in a virtual team and was shown as an advantage. However language difference and communication issues were highlighted as issues affecting knowledge sharing. Several of the communication tools and such as e-mails, teleconference, telephone, video conferencing, and collaboration tools such databases (PWS/CWS and network drives) were discussed in general as being used in the company. The overwhelming response was that these were just communication tools and on their own cannot be used to ensure trust. This study recommends that virtual teams have a project kick-off meeting that is held FTF. The management of knowledge can be improved if team leaders understand the social context of the team, and provide the necessary support. The team leader further has to create a team culture that facilitates the development of project goals and group norms with respect to decision making, conflict resolution, and so on. This study suggests training in intercultural communications to focus on differences in verbal styles instead of nonverbal differences. Finally while e-mail with synchronous chat or screen sharing might be better for team teleconferences, collaborative group systems should incorporate multiple media channels.Graduate School of Business LeadershipM.B.A

Biological modelling of the radiation dose escalation effect of regional hyperthermia in cervical cancer

Background Locoregional hyperthermia combined with radiotherapy significantly improves locoregional control and overall survival for cervical tumors compared to radiotherapy alone. In this study biological modelling is applied to quantify the effect of radiosensitization for three cervical cancer patients to evaluate the improvement in equivalent dose for the combination treatment with radiotherapy and hyperthermia. Methods The Linear-Quadratic (LQ) model extended with temperature-dependent LQ-parameters α and β was used to model radiosensitization by hyperthermia and to calculate the conventional radiation dose that is equivalent in biological effect to the combined radiotherapy and hyperthermia treatment. External beam radiotherapy planning was performed based on a prescription dose of 46Gy in 23 fractions of 2Gy. Hyperthermia treatment using the AMC-4 system was simulated based on the actual optimized system settings used during treatment. Results The simulated hyperthermia treatments for the 3 patients yielded a T50 of 40.1 °C, 40.5 °C, 41.1 °C and a T90 of 39.2 °C, 39.7 °C, 40.4 °C, respectively. The combined radiotherapy and hyperthermia treatment resulted in a D95 of 52.5Gy, 55.5Gy, 56.9Gy in the GTV, a dose escalation of 7.3–11.9Gy compared to radiotherapy alone (D95 = 45.0–45.5Gy). Conclusions This study applied biological modelling to evaluate radiosensitization by hyperthermia as a radiation-dose escalation for cervical cancer patients. This model is very useful to compare the effectiveness of different treatment schedules for combined radiotherapy and hyperthermia treatments and to guide the design of clinical studies on dose escalation using hyperthermia in a multi-modality setting

Comparison of the effect of semi-rigid ankle bracing on performance among injured v. non-injured adolescent female hockey players

Objective. To determine the comparative proprioceptive performance of injured v. non-injured adolescent female hockey players wearing an ankle brace.Methods. Data were collected from 100 high school players who belonged to the Highway Secondary School Hockey League, KwaZulu-Natal, via voluntary parental informed consent and player assent. Players completed an injury questionnaire probing the prevalence and nature of hockey injuries (March - August 2013). Subsequently, players completed a Biodex proprioceptive test with and without an ankle brace. Probability was set at p≤0.05.Results. Twenty-two players sustained ankle injuries within the 6-month study period (p&lt;0.001). Injured players performed similarly without bracing (right anterior posterior index (RAPI) 2.8 (standard deviation (SD) 0.9); right medial lateral index (RMLI) 1.9 (0.7); left anterior posterior index (LAPI) 2.7 (0.9); left medial lateral index (LMLI) 1.7 (0.6)) compared with bracing (RAPI 2.7 (1.4); RMLI 1.8 (0.6); LAPI 2.6 (1.0); LMLI 1.5 (0.6)) (p&gt;0.05). However, bracing improved the ankle stability of the non-injured group (RAPI 2.2 (0.8); RMLI 1.5 (0.5); LAPI 2.4 (0.9); RMLI 1.5 (0.5)) compared with their performance without a brace (RAPI 2.5 (1.0); RMLI 1.8 (0.8); LAPI 2.8 (1.1); LMLI 1.8 (0.6)) (p&lt;0.05).Conclusion. Ankle bracing did not enhance the stability of injured ankles. However, ankle bracing has an ergogenic effect that enhances the stability of healthy ankles

Genetic control of Eucalyptus urophylla and E. grandis resistance to canker caused by Chrysoporthe cubensis

Chrysophorte cubensis induced canker occurs in nearly all tropical and subtropical regions where eucalypts are planted, causing losses in both wood quality and volume productivity, especially so in the warmer and more humid regions of Brazil. The wide inter and intra-specific genetic variability of resistance to canker among Eucalyptus species facilitates the selection of resistant plants. In this study, we evaluated resistance to this pathogen in five Eucalyptus grandis (G) and 15 E. urophylla (U) trees, as well as in 495 individuals from 27 progenies derived from crosses between the trees. In the field, six-months-old test seedlings were inoculated with C. cubensis. Lesion length in the xylem and bark was measured eight months later. The results demonstrated that xylem lesions could preferentially be used for the selection of resistant clones. Eight trees (7 U and 1 G) were susceptible, and the remainder (8 U and 4 G) resistant. Individual narrow and broad sense heritability estimates were 17 and 81%, respectively, thereby suggesting that canker resistance is quantitative and highly dependent on dominance and epistasis

Optimising a couples-focused intervention to increase couples’ HIV testing and counselling using the person-based approach: a qualitative study in Kwa-Zulu Natal, South Africa

Objectives This qualitative study explored how to optimise a couples-focused intervention to promote couples HIV testing and counselling (CHTC). Setting Community setting in Kwa-Zulu Natal, South Africa. Participants Qualitative interviews were conducted with 20 couples who had participated in a couples-focused intervention and five staff members delivering the intervention. Partners were interviewed individually by researchers of the same gender. Intervention A couples-focused intervention comprised of two group sessions and four couples counselling sessions was previously shown to significantly increase uptake to CHTC in Kwa-Zulu Natal, South Africa. However, more than half of couples participating in the intervention still chose not to test together during follow-up. Analysis The transcripts were analysed using the table of changes from the person-based approach. Proposed optimisations were discussed with a community group to ensure the intervention was as persuasive and acceptable as possible. Results Many couples found it challenging to discuss CHTC with their partner due to an implied lack of trust. Optimisations to the intervention were identified to increase readiness to discuss CHTC, including education about serodiscordance, discussions about CHTC by peer mentors and open discussion of personal barriers to CHTC during couples’ counselling sessions. Additional training for staff in open questioning techniques could help them feel more comfortable to explore couples’ perceived barriers to CHTC, rather than advising couples to test. A logic model was developed to show anticipated mechanisms through which the optimised intervention would increase uptake to CHTC, including increasing knowledge, increasing positive outcome beliefs and managing negative emotions. Conclusions In-depth qualitative research informed optimisations to a couples-focused intervention for further evaluation in South Africa to encourage uptake to CHTC. Suggestions are made for optimal methods to gain open feedback on intervention experiences where participants may be reluctant to share negative views

Whole genome comparison of Thermus sp. NMX2.A1 reveals principal carbon metabolism differences with closest relation Thermus scotoductus SA-01

Genome sequencing of the yellow-pigmented, thermophilic bacterium Thermus sp. NMX2.A1 resulted in a 2.29 Mb draft genome that encodes for 2312 proteins. The genetic relationship between various strains from the genus Thermus was assessed based on phylogenomic analyses using a concatenated set of conserved proteins. The resulting phylogenetic tree illustrated that Thermus sp. NMX2 A.1 clusters together with Thermus scotoductus SA-01, despite being isolated from vastly different geographical locations. The close evolutionary relationship and metabolic parallels between the two strains has previously been recognized; however, neither strain’s genome data were available at that point in time. Genomic comparison of the Thermus sp. NMX2.A1 and T. scotoductus SA-01, as well as other closely related Thermus strains, revealed a high degree of synteny at both the genomic and proteomic level, with processes such as denitrification and natural cell competence appearing to be conserved. However, despite this high level of similarity, analysis revealed a complete, putative Calvin–Benson–Bassham (CBB) cycle in NMX2.A1 that is absent in SA-01. Analysis of horizontally transferred gene islands provide evidence that NMX2 selected these genes due to pressure from its HCO3 - rich environment, which is in stark contrast to that of the deep subsurface isolated SA-01.The National Research Foundation and the Technology Innovation Agency, South Africa.http://www.g3journal.orgam2017Biochemistr