Numerical simulations of rotating sunspots

A numerical model of idealized, axisymmetric, rotating sunspots is presented. The model contains a compressible plasma described by the nonlinear MHD equations, with density and temperature gradients simulating the upper layer of the sun’s convection zone. The solution forms a central flux tube in the cylindrical numerical domain, with convection cells pushing the magnetic field to the axis. When the numerical domain is rotated with a constant angular velocity, the umbra rotates as a rigid body while the surrounding convection cells show a swirling, vortical flow. As a result, the azimuthal velocity and magnetic field have their maximum values close to the flux tube, inside the innermost convection cell

En-visioning the dance : the audience as mirror

The current article is focused upon an exploration of the question of the nature of the art audience, with a specific emphasis on dance considered as a performing art. Five possible kinds of perceiver involved in the reception of dance as an art are discussed in order to demonstrate that the much criticized metaphor of the mirror can indeed function as a fruitful means to develop an understanding of how dance as an art is perceived, specifically if a more nuanced understanding of the mirror metaphor is applied. In its attempt to rehabilitate this metaphor, the paper draws upon and develops selected aspects of the philosophy of art proposed by John Dewey in his often overlooked Art as Experience (1934)

Nietzsche on embodiment : a Proto‐Somaesthetics?

Abstract: This chapter considers Richard Shusterman’s claim in his The Silent, Limping Body of Philosophy2 that Friedrich Nietzsche’s work constitutes a mere inversion of the mind‐body hierarchy, by providing an interpretation of selections from the Nietzschean corpus. The aim of the chapter is to show that Nietzsche’s position on the self is able to avoid falling into the “logic of reversal” that Shusterman diagnoses in his thinking. The chapter’s arguments then provide support for the conclusion that Nietzsche’s writings on the singing, dancing body could be seen as an example of a (proto‐) phenomenology, and indeed, a (proto‐) somaesthetics

Ripening-related gene expression during fruit ripening in Vitis vinifera L. cv. Cabernet Sauvignon and Clairette blanche

The gene expression patterns in ripening fruit of a high quality wine cultivar (Cabernet Sauvignon) and a poor quality wine cultivar (Clairette blanche) were studied using cDNA-AFLP fingerprinting. Total RNA from "immature" (14-weeks post flowering) and "mature" (18-weeks post flowering) berries were used to study ripening-related gene expression in post-véraison stages of berry development. A total of 1,276 fragments were analysed, of which 175 appeared to be ripening-related. Average pairwise differences of the fragments amplified from "immature" and "mature" Cabernet Sauvignon and Clairette blanche berries, revealed a high level of similarity between the two cultivars. 70 % of the ripening-related fragments were cultivar-specific. The number of cultivar-specific and/or ripening-related fragments amplified, depended on the selective nucleotides of the primers used in the cDNA-AFLP analysis. Reverse slot blot and northern blot analysis confirmed that the expression of the identified genes were ripening-related.

Labour conflict and the persistence of macro underemployment in South Africa

Something must be structurally wrong in a labour market when a well developed economy like that of South Africa is not able to absorb and allocate an accumulating surplus of labour over a period of 20 years or longer but has instead moved to the use of more capital-intensive technology. The objective of this paper is to analyse the role labour conflict plays in the persistence of macro underemployment in South Africa. For the analysis two models identified from the literature were used. In these models labour conflict originates from an over-regulated labour market where labour appropriates capital and bad or hostile labour relations. In both models the switch to technology leads to underemployment. It was found that bad labour relations contribute to the persistence of underemployment in South Africa

Die benutting van vraelyste met die oog op meer effektiewe toerusting tydens huweliksvoorbereiding

The utilization of questionnaires with the intent to make marriage preparation more effectiveThis study aims to promote the idea that questionnaires used as part of marriage preparation, could be a valuable tool. The article also attempts to identify some themes that should form part of the discussion between the pastor and a couple to prepare them for their marriage. Furthermore, the aim is to assist pastors, especially those in the Nederduitsch Hervormde Kerk van Afrika, utilizing questionnaires during marriage preparation

Molecular analysis of fruit ripening: The identification of differentially expressed sequences in Vitis vinifera using cDNA-AFLP technology

Differential gene expression patterns were studied during the ripening process of grape berries (Vitis vinifera cv. Chardonnay). Thirty PstI + MseI primer combinations were used to generate 213 fragments that appeared to be differentially expressed of which 94 % were successfully re-amplified. Reverse northern dot-blot analysis indicated that 35 % of the fragments had similar gene expression profiles to cDNA-AFLPs regarding developmental-stage specificity. Northern blot analyses confirmed the tissue and/or developmental stage specific expression of three of these cDNA fragments. This work illustrates that developmentally regulated sequences can be identified from grape berry tissue using cDNA-AFLP technology

Can groundwater be successfully implemented as a bulk water resource within rural Limpopo Province? Analysis based on GRIP datasets

Groundwater is a strategic water resource in rural Limpopo Province and it accounts for almost 70% of rural domestic water supply. The resource is available throughout the Province in varying quantities and qualities depending on the hydrogeological properties of the underlying aquifer. These properties are mostly secondary in nature and are constrained by the processes of weathering, faulting, fracturing and the influence of intrusive rocks. These properties define typical fractured aquifers in which the selection of drilling sites requires a thorough scientific approach to locate a successful productive borehole. While most water service authorities in the Province have been randomly developing new boreholes with limited success rates, the analysis of datasets in the newly established groundwater data repository, the Limpopo Groundwater Resource Information Project (GRIP) demonstrates that large quantities of groundwater can be obtained and used for bulk supply if the drilling sites are scientifically selected. The GRIP dataset contains 24 922 entries of which 4 000 were tested. The pumping test results indicate that an estimated 576 000 m3/d (210 Mm3/a) can be sustainably abstracted from boreholes in approximately 2 500 villages that are dispersed throughout the Province. However, more than 50% of these boreholes areunequipped of which 3 000 can provide a combined yield of 109 Mm3/a based on a 24 h abstraction rate. These results show that groundwater can be developed as a potential viable bulk-water supply source. This paper attempts to demonstrate, using the existing GRIP dataset, that groundwater is an underutilised resource that can be viably and cost-effectively developed as an alternative bulk water source or conjunctively with surface water