Experiments pertaining to the formation and equilibration of planetary cores

The phase diagram of FeO was experimentally determined to pressures of 155 GPa and temperatures of 4000 K using shock wave and diamond-cell techniques. Researchers discovered a metallic phase of FeO at pressures greater than 70 GPa and temperatures exceeding 1000 K. The metallization of FeO at high pressures implies that oxygen can be present as the light alloying element of the Earth's outer core, in accord with the geochemical predictions of Ringwood. The high pressures necessry for this metallization suggest that the core has acquired its composition well after the initial stages of the Earth's accretion. The core forming alloy can react chemically with oxides such as those forming the mantle. The core and mantle may never have reached complete chemical equilibrium, however. If this is the case, the core-mantle boundary is likely to be a zone of active chemical reactions

Youth multilingualism in South Africa's hip-hop culture: a metapragmatic analysis

This paper describes the practice of youth multilingualism in South Africa's hip-hop culture, in an online social media space and an advertising space. Based on a multi-sited ethnographic fieldwork study of youth multilingual practices, comprising of the following data sets - multilingual interviews, observations, multilingual interactions and performances, documents and online social networking interactions - the paper reports on how young multilingual speakers active in the hip-hop culture of the country talk and write about the intermixing of racial and ethnic speech forms, as well as use registers in the practice of gendered identities. The argument I put forth in the paper is that the examples of youth multilingualism suggest a complex picture of youth multilingual contact in postcolonial South Africa, and one that require a sociocultural linguistic response that accounts for the cultural influence of youth multilingualisms in local hip-hop culture. To such an end, I suggest that multilingual policy planning in the country should be readjusted to the complex sociocultural changes we see emerge with youth multilingual practices.IBS

Rastafarian-herbalists' enregisterment of multilingual voices in an informal marketplace

What do we mean when we talk about "multilingual voice" in the post-apartheid sociolinguistic context of South Africa? In this paper, I explore this question by reporting on an ethnographic fieldwork project that involved the participant-observation of Rastafarian-herbalists trading goods in an informal marketplace. I focus in the paper on Rastafarian-herbalists' language practices and participation in ideological debates surrounding the ethics of Rastafarian religious practices as they navigate the complex yet regimented linguistic landscape of the informal marketplace in which they trade their goods. Furthermore, I explore in the paper how the marginalized trading lives of the Rastafarian-herbalists are characterized by the daily negotiation of power and diversity discourses as they try to define their voices. Their engagement with diverse multilingual populations, I argue, not only provides them with excellent opportunities to expand their multilingual repertoires, but also teaches them to manage strategically "multilingual voices" in interaction in order to sell their products. I argue further that although we cannot take stock of all types of marginalization, we should develop sociolinguistic approaches that are not only sympathetic to the marginalization of people and languages in the everyday, but also attune our methodologies to accurately capture experiences in small places such as the ones where Rastafarian-herbalists trade

Multilingualism remixed: Sampling, braggadocio and the stylisation of local voice

Among the many challenges posed by contexts of social transformation and extensive mobility is the question of how multilingual voice may carry across media, modalities and context. In this paper, we suggest that one approach to this complex problem may be to look at multilingual voice from a sociolinguistic perspective of performance. Our focus here is thus on how marginalised voices on the periphery of Cape Town become mainstreamed within the city’s hip-hop community. Specifically, we ask how emcees sample local varieties of language, texts and registers to stage their particular stylisation of voice. By way of conclusion, we make brief recommendations with respect to the study of multilingualism in South Africa and how the stylisation of local voices in Cape Town hip-hop could inform studies on multilingual policy and planning.Department of HE and Training approved lis

Food and water gaps to 2050: preliminary results from the global food and water system (GFWS) platform

This paper was part of a workshop sponsored by the OECD Co-operative Research Programme on Biological Resource Management for Sustainable Agricultural Systems.This paper was part of a workshop sponsored by the OECD Co-operative Research Programme on Biological Resource Management for Sustainable Agricultural Systems

Bark, smoke and pray: multilingual Rastafarian-herb sellers in a busy subway

This paper is an analysis of how multilingual Rastafarian-herbalists organize multilingual and multimodal interactions in a subway. The rationale has been to understand the practice of multilingual repertoires by multilingual speakers in Cape Town marketplaces. It contributes to literature on language use in marketplaces by highlighting how linguistic and non-linguistic resources are drawn on and co-produced in interaction among Rastafarians who identify as informal herb traders. It also attempts to expand the theoretical apparatus of the sociolinguistics of globalization by introducing the notions of embodied rhythm and extreme locality. By applying these notions to how Rastafarian-herbalists organize multilingual and multimodal interaction in a subway, the analysis illustrates not only the importance of body positioning and bodily behaviour in multimodal communication, but also the emphasis on local languages and speech varieties that feature as important linguistic resources, and the multilingual performance of an extreme locality.IS

The Application of Dual-medium and parallel-medium models of bi-lingual education at two primary schools in the Western Cape

Magister Artium - MAThis study is an investigation of the application of dual-medium and parallel-medium models of bilingual schooling as implemented at two historically disadvantaged primary schools in the Western Cape. The author assumes that parallel-medium in practice uses only one language of learning and teaching (LoLT), and thus lead to monolingual classroom practice. The author used qualitative techniques (observations, interviews, and document analyses.), and triangulation method, to understand the application of dual-medium and parallel-medium instruction and the support of principals and teachers in their understanding of the design models. Observations were made in Grade 7 classrooms at selected and document analyses, triangulated with interviews conducted with principals and teachers to expound the effective practice of bilingual education at school and classroom level. Document analyses were made of classroom materials (various literary artefacts) used for the development of language proficiency. in addition, how it contributes to the Grade 7 learners academic perform and language development in dual-medium and parallel-medium classrooms.South Afric

Economic Thought: A Biblical Perspective

This study joins the debate about whether capitalism or socialism best shows how the Bible sees economic interactions between people and, by extension, provides insights into how a Christian should live. Capitalism is based on the private ownership and control of resources and profit, which spread with the migration process of the Protestants. Socialism is based on the idea that the group or community should own the means of production and distribution to benefit everyone equally. This paper argues that biblical principles point neither to socialism nor capitalism as the appropriate economic framework for economic interactions and the organization of economic life in society. This assertion is based on how Jesus lived His life and various statements He made while here on earth, as presented in the Bible. The study demonstrates that Jesus is variously portrayed as a revolutionary socialist and a compassionate capitalist, and that Christians are called to responsibly manage the resources entrusted to them by God, for there is accountability for every economic choice and preference

Missing in action: possible effects of water recovery on stream and river flows in the Murray-Darling Basin, Australia

We use published water balance data from irrigated cropping to show that water entitlements acquired for environmental purposes through water infrastructure subsidies in the Murray-Darling Basin, Australia, have resulted in smaller increases in net stream and river flows than is estimated by the Australian Government, and may even have reduced net stream and river flows. Two key policy implications arising from our results are: (1) subsidies to improve irrigation efficiency so as to increase stream and river flows must employ water accounting so that the effects on return flows are known and the volume of water extracted for irrigation is adjusted to achieve desired stream and river flows; and (2) if the net increases in stream and river flows in the MDB are much less than estimated by the Australian Government, water infrastructure subsidies to increase irrigation efficiency may have compromised the delivery of key objects of the Water Act (2007)