Procedures for the resolution of labour disputes

After SACCOLA's expulsion from the International Organization of Employers in 1983 the committee decided to explore areas of domestic activity consistent with its objectives of discussing employer views on labour affairs, and representing these views where agreement amongst employers existed. As the National Manpower Commission had shortly afterwards published a lengthy report dealing, inter alia, with the role of the Industrial Court and the definition of the unfair labour practice concept, SACCOLA set up a working party to see if employer consensus could be achieved on these issues. SACCOLA succeeded in agreeing a 18 page document, which was submitted to the Department of Manpower on 28 August 1984. This was subsequently acknowledged by the Director General of Manpower to have been one of the most comprehensive reactions to this report. In his reaction to the report, however, Dr Van der Merwe noted that legislative change would be greatly facilitated by labour/employer agreement, and he therefore suggested that SACCOLA should discuss its proposals with union federations

EMERGING TECHNOLOGIES: COMMERCIAL READINESS INDEX (CRI) FOR MEDICAL ADDITIVE MANUFACTURING (AM)

ArticleTechnology Readiness Level (TRL) is widely used as a measure of technology maturity. However, TRL is not necessarily a good indicator of commercial readiness. In the renewable energy sector a Commercial Readiness Index (CRI) is used where only a technology with a high TRL qualifies for commercial readiness. Similarly TRL is used to measure the maturity of Additive Manufacturing (AM) technologies. This research proposes a Commercial Readiness Index (CRI) for Additive Manufacturing. A case-study on maxillofacial Ti6Al4V implants manufactured with AM is referred to

An evaluation of the assessment tool used for extensive mini-dissertations in the Master’s Degree in Family Medicine, University of the Free State

Background: Family Medicine became a speciality in South Africa in 2007. Postgraduate studies in Family Medicine changed from part-time Master of Family Medicine (MFamMed) to a full-time Master of Medicine (Family Medicine) [MMed(Fam)] degree, with changes in the curriculum and assessment criteria. The overall goal of this study was to evaluate the current assessment tool for extensive mini-dissertations in the  postgraduate programme for Family Medicine, at the University of the Free State, and if necessary, to produce a valid and reliable assessment tool that is user-friendly.Method: An action research approach was used in this study, using mixed methods. Firstly, marks given by 15 assessors for four mini-dissertations using the current assessment tool were analysed quantitatively. In Phase 2, the regulation of the assessment bodies and the quantitative results of Phase 1 were discussed by assessors during a focus group interview, and data were analysed qualitatively. An adapted, improved assessment tool (Phase 3) was developed and re-evaluated in Phase 4.Results: The current assessment tool complied with the regulations of the assessment bodies. The scores allocated to specific categories varied with a median coefficient of variation of more than 15% in four of the possible 12 assessment categories. During the focus group interview, reasons for this were identified and the assessment tool adapted accordingly. During reassessment of the tool, individual assessors were identified as the  reason for poor reliability.Conclusion: The current assessment tool was found to be valid, but was not reliable for all assessment categories. The adapted assessment tool  addressed these areas, but identified lack of training and experience in the assessment of extensive mini-dissertations by certain assessors as the main reason for unreliable assessment

Reasons for doctor migration from South Africa

Background: The migration of doctors from their home countries is not a new phenomenon. Apart from voluntary migration due to various reasons,medical professionals, often from sub-Saharan Africa, are actively recruited by developed countries. Doctors in South Africa are esteemed for the highstandard of training they receive locally, a quality which renders them prime candidates for employment. Various factors are involved in the push-pull theory of migration. It has, however, been reported extensively that push factors usually play a much greater role in doctors’ decision to leave their countries of origin, than do pull factors in the host or recipient country. Push factors motivating migration most frequently include dissatisfaction with remuneration packages and working conditions, high levels of crime and violence, political instability, lack of future prospects, HIV/AIDS and a decline in education systems. In addition to a depletion of intellectual resources through losing highly qualified and skilled  individuals, source countries also face substantial monetary implications caused by the migration of doctors. Government subsidy of medical students’ training could be regarded as a lost investment when young graduates seek permanent employment abroad. The aim of the study was to investigate the profile of South African qualified physicians who had emigrated from South Africa.Methods: The investigation was conducted in 2005 as a descriptive study of participants found primarily by the snowball sampling method. Theinitial participants were known to the researcher. Participants had to be graduates from South African medical schools/faculties, living abroad andin possession of a permanent work permit in the countries where they were employed. Short-term locum doctors were not included. Information,consent letters and questionnaires were either hand-delivered or e-mailed, and completed forms and questionnaires were returned via these routes.Participation was voluntary.Results: Twenty-nine of 43 potential participants responded, of which 79.3% were male and 20.7% female between the ages of 28 and 64 years(median 47 years). The year of graduation ranged from 1964 to 2000 (median 1985), and the year of leaving the country ranged from 1993 to 2005 (median 2002). The majority (72.4%) were in private practice before they left, 27.5% had public service appointments and 17.3% were employed by private hospitals. Seventy-nine per cent of respondents had postgraduate qualifications. Countries to which migration occurred included New Zealand, United Arab Emirates, Bahrain, United Kingdom, Canada, Yemen and Australia. Forty-one per cent of respondents indicated that they would encourage South African young people to study medicine, although 75% would recommend newly graduated doctors to leave the country. Financial factors were indicated as a reason for leaving by 86.2% of the respondents, better job opportunities by 79.3%, and the high crime rate in South Africa by 75.9%. Only 50% of the respondents said that better schooling opportunities for their children played a role in their decision to leave the country.Approximately one-fifth (17.9%) of the respondents indicated that they already had family abroad by the time they decided to emigrate.Conclusions: Financial reasons were the most important motivating factor in this particular group of doctors who relocated to overseas destinations,followed by working conditions and the rate of crime and violence in the country. In comparison to other investigations published previously, theresults presented here clearly indicate a tendency that more doctors offer financial and crime-related reasons for migration from South Africa thanbefore. In order to prevent the loss of medical expertise from a society already in need of quality healthcare, issues compelling doctors to look forgreener pastures should be addressed urgently and aggressively by stakeholders

Sonic injection into a PGM Peirce-Smith converter: CFD modelling and industrial trials

Peirce-Smith converters (PSCs) are extensively used in the copper, nickel, and platinum group metals industries. The typical converting operation involves lateral purging of air into molten matte through a bank of tuyeres. This blowing operation occurs at low pressure from the blowers, resulting in a bubbling regime that is considered inefficient from both a process and an energy utilization perspective. Inherent drawbacks also include recurrent tuyere blockage, tuyere punching, and low oxygen efficiency. Western Platinum embarked on a full-scale industrial evaluation of generating a jetting regime by using sonic injection. Prior to industrial- scale tests, a numerical assessment to ascertain the feasibility of implementing sonic injection into a PSC was conducted. The work included flow characterization at high-pressure injection achieving sonic velocity at the tuyere exit. The 2D and 3D simulations of the three-phase system were carried out using the volume of fluid method together with the RKE turbulence model to account for the multiphase and turbulent nature of the flow. This paper discusses the key findings in understanding plume extension, velocity distribution, shear wall stress analysis, and phase distribution characteristics in the system. Plant trials are also discussed with reference to the commercial aspects of a full-scale implementation of sonic injection in the smelter

A light microscopic and immunocytochemical study of the gastro-intestinal tract of the ostrich (Struthio camelus L.)

Although the histological features and endocrine cells of the gastro-intestinal tract of the chicken have been well studied, little is known about these features of the gut of the ostrich. The present study was undertaken to elucidate the histology and peptide-storing endocrine cells of the ostrich. As a rule the histological features of the gastro-intestinal tract of the ostrich corresponded to that of the fowl. However, certain differences were observed. The superficial proventricular glands were simple, branched tubular glands, while the deep proventricular glands were restricted to a slipper-shaped area and extended into the muscularis mucosae. The gizzard had a variably developed muscularis mucosae, a feature that seems to be unique to the ostrich. The villi of the small intestine were long and branched profusely, forming a labyrinthine surface. No Paneth cells were observed. The mucosa of the ceca and the first part of the rectum was thrown in large circular folds, forming a compressed spiral. Numerous melanocytes were seen in the submucosa and the connective tissue around the blood vessels of the muscle layers at the tips of the ceca. A well developed subserosa was present throughout the gastro-intestinal tract. Endocrine cells immunoreactive to somatostatin, glucagon, gastrin, bombesin, neurotensin, substance P and pancreatic polypeptide were detected in the gastro-intestinal tract of the ostrich. The topographical distribution of those endocrine cells immunoreactive to glucagon, bombesin, neurotensin and substance P differed from that of the chicken. The results of this investigation inferred that at least one of the gut peptides of the ostrich (secretin) to be structurally different from its counterparts in mammal and chicken. Molecular heterogeneity of somatostatin was observed in endocrine cells situated in the deep ventricular glands of the ostrich.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.mn201

Strict inequalities of critical values in continuum percolation

We consider the supercritical finite-range random connection model where the points $x,y$ of a homogeneous planar Poisson process are connected with probability $f(|y-x|)$ for a given $f$. Performing percolation on the resulting graph, we show that the critical probabilities for site and bond percolation satisfy the strict inequality $p_c^{\rm site} > p_c^{\rm bond}$. We also show that reducing the connection function $f$ strictly increases the critical Poisson intensity. Finally, we deduce that performing a spreading transformation on $f$ (thereby allowing connections over greater distances but with lower probabilities, leaving average degrees unchanged) {\em strictly} reduces the critical Poisson intensity. This is of practical relevance, indicating that in many real networks it is in principle possible to exploit the presence of spread-out, long range connections, to achieve connectivity at a strictly lower density value.Comment: 38 pages, 8 figure

Micromechanical homogenization of a hydrogel-filled electrospun scaffold for tissue-engineered epicardial patching of the infarcted heart: a feasibility study

For tissue engineering applications, accurate prediction of the effective mechanical properties of tissue scaffolds is critical. Open and closed cell modelling, mean-field homogenization theory, and finite element (FE) methods are theories and techniques currently used in conventional homogenization methods to estimate the equivalent mechanical properties of tissue-engineering scaffolds. This study aimed at developing a formulation to link the microscopic structure and macroscopic mechanics of a fibrous electrospun scaffold filled with a hydrogel for use as an epicardial patch for local support of the infarcted heart. The macroscopic elastic modulus of the scaffold was predicted to be 0.287 MPa with the FE method and 0.290 MPa with the closed-cell model for the realistic fibre structure of the scaffold, and 0.108 MPa and 0.540 MPa with mean-field homogenization for randomly oriented and completely aligned fibres. The homogenized constitutive description of the scaffold was implemented for an epicardial patch in a FE model of a human cardiac left ventricle to assess the effects of patching on myocardial mechanics and ventricular function in the presence of an infarct. Epicardial patching was predicted to reduce maximum myocardial stress in the infarcted LV from 19 kPa (no patch) to 9.5 kPa (patch) and to marginally improve the ventricular ejection fraction from 40% (no patch) to 43% (patch). This study demonstrates the feasibility of homogenization techniques to represent complex multiscale structural features in a simplified but meaningful and effective manner

The time to extinction for an SIS-household-epidemic model

We analyse a stochastic SIS epidemic amongst a finite population partitioned into households. Since the population is finite, the epidemic will eventually go extinct, i.e., have no more infectives in the population. We study the effects of population size and within household transmission upon the time to extinction. This is done through two approximations. The first approximation is suitable for all levels of within household transmission and is based upon an Ornstein-Uhlenbeck process approximation for the diseases fluctuations about an endemic level relying on a large population. The second approximation is suitable for high levels of within household transmission and approximates the number of infectious households by a simple homogeneously mixing SIS model with the households replaced by individuals. The analysis, supported by a simulation study, shows that the mean time to extinction is minimized by moderate levels of within household transmission

Customer Specific Transaction Risk Management in eCommerce

Increasing potential for turnover in e-commerce is inextricably linked with an increase in risk. Online retailers (e-tailers), aiming for a company-wide value orientation should manage this risk. However, current approaches to risk management either use average retail prices elevated by an overall risk premium or restrict the payment methods offered to customers. Thus, they neglect customer-specific value and risk attributes and leave turnover potentials unconsidered. To close this gap, an innovative valuation model is proposed in this contribution that integrates customer-specific risk and potential turnover. The approach presented evaluates different payment methods using their risk-turnover characteristic, provides a risk-adjusted decision basis for selecting payment methods and allows e-tailers to derive automated risk management decisions per customer and transaction without reducing turnover potential