Stopping antidepressants

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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

Pedagogical regression through service-learning develops the holistic medical graduate by redefining reciprocity

Pedagogical regression through Service-learning uses dialogue and deliberation as active learning tools. Reciprocity is a consequence rooted in this engagement with diverse communities. The aim of the study was to analyse how reciprocity manifests during service-learning. Data collected from students, Grade 12 learners, radiography facilitators, and conference delegates were analysed. Students indicated that service-learning enhanced their learning through self-discovery and group interactions, but nothing academic was learned from the learners. They experienced personal growth and increased levels of social responsiveness. Grade 12 learners reported no educational exchange with the students. Radiography facilitators agreed that service-learning cultivates reciprocity through application of knowledge and elevates personal growth and social responsiveness in students. Conference delegates said that service-learning enhances the curriculum and cultivates social responsiveness in students. Reciprocity in service-learning is polygonal and needs to be redefined in terms of its equal mutualistic nature, of all communities benefitting from a broadly defined exchange

Mental health in Higher Education- a comparative stress risk assessment at an open distance learning university in South Africa. I

Universities depend on committed efforts of all staff members to function effectively. However, where occupational demands outweigh occupational resources, challenging work becomes stressful, followed by an exhausted, disengaged workforce. It is unlikely that disengaged university staff will provide adequate care and service to geographically distant and psychologically isolated learners. As students rely heavily on the support of both administrative staff, as well as academic staff, to manage their learning experience, the work stress experienced by both groups deserves research attention. This study employed a comparative mixed method design, including administrative and academic staff from an Open Distance Learning university in South Africa using the Job Demands-Resources measurement instrument. Findings established from 294 university staff members elucidated staff members’ experience of work stress within a mega-distance learning university in the developing world. Mindfulness about the stressors that influence university personnel can inform strategic interventions required to alleviate distress for each employment category.Human Resource Managemen

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

Demonstration of Cowdria ruminantium in Amblyomma hebraeum by fluorescent antibody techniques, light and electron microscopy

Positive identification of Cowdria ruminantium in Amblyomma hebraeum was obtained by direct and indirect fluorescent antibody techniques, and by light and electron microscopy. Colonies of organisms could only be demonstrated with certainty in the epithelial cells and lumen of the alimentary tract of ticks.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.am201

Phase Transitions on Nonamenable Graphs

We survey known results about phase transitions in various models of statistical physics when the underlying space is a nonamenable graph. Most attention is devoted to transitive graphs and trees

Entanglement in the quantum Ising model

We study the asymptotic scaling of the entanglement of a block of spins for the ground state of the one-dimensional quantum Ising model with transverse field. When the field is sufficiently strong, the entanglement grows at most logarithmically in the number of spins. The proof utilises a transformation to a model of classical probability called the continuum random-cluster model, and is based on a property of the latter model termed ratio weak-mixing. Our proof applies equally to a large class of disordered interactions

’n Gereformeerd-narratiewe pastorale terapie

Narrative therapy is usually connected with a post-modern paradigm like Social Constructionism. However, for some researchers and therapists post-modernity is not acceptable, since the use of such a narrative therapy could construe many contrasting points of departure in contrast to a biblical based pastoral therapy. Is it possible to deconstruct the basic elements of narrative therapy and reconstruct a pastoral narrative therapy that makes use of strategies of narrative therapy without accepting the paradigm that underlies it? This article proposes a new and exciting possibility for pastoral narrative therapy that could benefit from the many advantages of narrative therapy without being unfaithful to the unique nature of a pastoral and reformed approach