New spaces of citizenship? Rethinking gendered participation and empowerment in South Africa

This paper draws on empirical research in South Africa to explore questions about the exclusionary nature of citizenship, the problems and possibilities of participatory citizenship and its potential reconceptualisation through the lens of gender. The paper examines some of the major debates and policies in South Africa around issues of citizenship, participation and gender and explores why the discursive accommodation of gender equity by the South African government is not fully realised in its attempts to construct substantive and participatory citizenship. It explores some of the emergent spaces of radical citizenship that marginalized groups and black women, in particular, are shaping in response. Findings suggest that whilst there are possibilities for creating alternative, more radical citizenship spaces, these can also be problematic and exclusionary. The paper draws on recent feminist writing to examine the possibilities for rethinking citizenship as an ethical, non-instrumental social status, distinct from both political participation and economic independence. This reframing of citizenship moves beyond notions of ‘impasse’ or ‘hollowness’, challenges the public/private distinction that still frames many debates about citizenship and considers the emancipatory potential of gendered subjectivity. The paper argues that citizenship is shaped by differing social, political and cultural contexts and this brings into sharp focus the problematic assumption of the universal applicability of western concepts and theories

Peculiar mean velocity profiles within a porous bed of an open channel

Peer reviewedPublisher PD

A globally accurate theory for a class of binary mixture models

Using the self-consistent Ornstein-Zernike approximation (SCOZA) results for the 3D Ising model, we obtain phase diagrams for binary mixtures described by decorated models. We obtain the plait point, binodals, and closed-loop coexistence curves for the models proposed by Widom, Clark, Neece, and Wheeler. The results are in good agreement with series expansions and experiments.Comment: 16 pages, 10 figure

Verbalisers and Visualisers: Cognitive Styles That Are Less Than Equal

Over the past thirty years numerous models of cognitive style, varying in complexity and applicability, have been developed. While these models have sparked a vast body of educational research, the results have been equivocal. The models have been widely criticized for their lack of precision and predictability. According to Kozhevnikov, Kosslyn & Sheppard (2005, p 710) “much of the previous work suffered from arbitrary distinctions and overlapping dimensions.” In spite of the criticism, several models of cognitive style survive and continue to stimulate research. Two of these models, the Field Dependent – Field Independence cognitive style and the Reflective-Impulsivity model will be reviewed briefly. Then we will discuss the Verbaliser-visualiser model on which the present research is based

Fairtrade, place and moral economy: between abstract ethical discourse and the moral experience of Northern Cape farmers

This paper explores the significance of the relationships and disjunctures between the global moral discourses of Fairtrade that are articulated through ethics of fairness in supply chains and the everyday moral experiences, discourses and practices of producers that shape moral economies in specific localities. Due to increased governance through universal codes, standards and certification, Fairtrade risks becoming an abstract ethical and regulatory tool, disconnected from the moral economies of those poor farmers it is intended to benefit. In response, the paper makes a case for a deeper understanding of the moral economies of farmers involved in Fairtrade networks and the ways in which these emerge out of moral experiences that are deeply embedded in local social and cultural relations. Through a case study of Eksteenskuil Agricultural Cooperative in South Africa’s Northern Cape, it seeks to demonstrate the importance of understanding the moral experiences of producers to better consider what is at stake for them, focusing on notions of cooperation, fairness and the ‘good farmer’, perceptions of community, and concerns with survival and self-sufficiency. The paper concludes that working in culturally-sensitive ways with producer communities and understanding how their local moral worlds are structured is vital in bridging the gap between abstract ethical discourses and the place-based moral experiences of producers, and to ensuring the effectiveness of Fairtrade initiatives

Ethical trading and socioeconomic transformation: critical reflections on the South African wine industry

Newly emerging ethical trade practices in the South African wine industry are examined as a way of engaging with debates about the ability of alternative trade approaches to facilitate meaningful opportunities for socioeconomic development in the global South. The South African wine industry has undergone rapid restructuring since the end of apartheid in order to meet the demands of international markets. However, transforming racially skewed ownership and skill patterns is proving a particular challenge. In this paper we outline some of the initiatives that have been introduced to stimulate socioeconomic change within the industry. By utilising analytical tools such as commodity chains, networks, and cultural approaches we demonstrate that a complex array of forces is driving change on the ground. Such forces include national imperatives derived from the legacy of apartheid and the concerns of consumers in the global North. We conclude by considering the types of local and global constraints that need to be challenged if these initiatives are to be successful in facilitating meaningful socioeconomic transformation within the wine industry

Solution of an associating lattice gas model with density anomaly on a Husimi lattice

We study a model of a lattice gas with orientational degrees of freedom which resemble the formation of hydrogen bonds between the molecules. In this model, which is the simplified version of the Henriques-Barbosa model, no distinction is made between donors and acceptors in the bonding arms. We solve the model in the grand-canonical ensemble on a Husimi lattice built with hexagonal plaquettes with a central site. The ground-state of the model, which was originally defined on the triangular lattice, is exactly reproduced by the solution on this Husimi lattice. In the phase diagram, one gas and two liquid (high density-HDL and low density-LDL) phases are present. All phase transitions (GAS-LDL, GAS-HDL, and LDL-HDL) are discontinuous, and the three phases coexist at a triple point. A line of temperatures of maximum density (TMD) in the isobars is found in the metastable GAS phase, as well as another line of temperatures of minimum density (TmD) appears in the LDL phase, part of it in the stable region and another in the metastable region of this phase. These findings are at variance with simulational results for the same model on the triangular lattice, which suggested a phase diagram with two critical points. However, our results show very good quantitative agreement with the simulations, both for the coexistence loci and the densities of particles and of hydrogen bonds. We discuss the comparison of the simulations with our results.Comment: 12 pages, 5 figure

Inference of transcriptional regulation using gene expression data from the bovine and human genomes

<p>Abstract</p> <p>Background</p> <p>Gene expression is in part regulated by sequences in promoters that bind transcription factors. Thus, co-expressed genes may have shared sequence motifs representing putative transcription factor binding sites (TFBSs). However, for agriculturally important animals the genomic sequence is often incomplete. The more complete human genome may be able to be used for this prediction by taking advantage of the expected evolutionary conservation in TFBSs between the species.</p> <p>Results</p> <p>A method of <it>de novo </it>TFBS prediction based on MEME was implemented, tested, and validated on a muscle-specific dataset.</p> <p>Muscle specific expression data from EST library analysis from cattle was used to predict sets of genes whose expression was enriched in muscle and cardiac tissues. The upstream 1500 bases from calculated orthologous genes were extracted from the human reference set. A set of common motifs were discovered in these promoters. Slightly over one third of these motifs were identified as known TFBSs including known muscle specific binding sites. This analysis also predicted several highly statistically significantly overrepresented sites that may be novel TFBS.</p> <p>An independent analysis of the equivalent bovine genomic sequences was also done, this gave less detailed results than the human analysis due to both the quality of orthologue prediction and assembly in promoter regions. However, the most common motifs could be detected in both sets.</p> <p>Conclusion</p> <p>Using promoter sequences from human genes is a useful approach when studying gene expression in species with limited or non-existing genomic sequence. As the bovine genome becomes better annotated it can in turn serve as the reference genome for other agriculturally important ruminants, such as sheep, goat and deer.</p

Modelling of an Oesophageal Electrode for Cardiac Function Tomography

There is a need in critical care units for continuous cardiopulmonary monitoring techniques. ECG gated electrical impedance tomography is able to localize the impedance variations occurring during the cardiac cycle. This method is a safe, inexpensive and potentially fast technique for cardiac output imaging but the spatial resolution is presently low, particularly for central locations such as the heart. Many parameters including noise deteriorate the reconstruction result. One of the main obstacles in cardiac imaging at the heart location is the high impedance of lungs and muscles on the dorsal and posterior side of body. In this study we are investigating improvements of the measurement and initial conductivity estimation of the internal electrode by modelling an internal electrode inside the esophagus. We consider 16 electrodes connected around a cylindrical mesh. With the random noise level set near 0.05% of the signal we evaluated the Graz consensus reconstruction algorithm for electrical impedance tomography. The modelling and simulation results showed that the quality of the target in reconstructed images was improved by up to 5 times for amplitude response, position error, resolution, shape deformation and ringing effects with perturbations located in cardiac related positions when using an internal electrode