Traditions of origin and the ideological appropriation of the past in the Zulu kingdom under Shaka

Paper presented at the Wits History Workshop: The Making of Class, 9-14 February, 198

'Zoolacratism' and 'cannibalism': a discussion of historical disposition towards the 'Shakan' model of social order and political rights

Paper presented at the Wits History Workshop: Democracy, Popular Precedents, Practice and Culture, 13-15 July, 199

James Stuart and "the establishment of a living source of tradition'

African Studies Seminar series. Paper presented 1 August, 1994In the late 1970s and the 1980s scholarship on the Zulu kingdom under Shaka changed significantly as scholars began for the first time to draw heavily on recorded African oral tradition as an historical source, and to use local and regional histories as counterweights to official accounts emanating from royal houses and associated senior royal clans.(1) The major source of such oral traditions pertinent to the area including and adjacent to the Zulu kingdom is the papers of the Natal colonial official, James Stuart (1868-1942

The real goat: identity and authenticity in Shakaland

Paper presented at the Wits History Workshop: Myths, Monuments, Museums; New Premises? 16-18 July, 199

Selection of high temperature thermal energy storage materials for advanced solar dynamic space power systems

Under the direction of NASA's Office of Aeronautics and Technology (OAST), the NASA Lewis Research Center has initiated an in-house thermal energy storage program to identify combinations of phase change thermal energy storage media for use with a Brayton and Stirling Advanced Solar Dynamic (ASD) space power system operating between 1070 and 1400 K. A study has been initiated to determine suitable combinations of thermal energy storage (TES) phase change materials (PCM) that result in the smallest and lightest weight ASD power system possible. To date the heats of fusion of several fluoride salt mixtures with melting points greater than 1025 K have been verified experimentally. The study has indicated that these salt systems produce large ASD systems because of their inherent low thermal conductivity and low density. It is desirable to have PCMs with high densities and high thermal conductivities. Therefore, alternate phase change materials based on metallic alloy systems are also being considered as possible TES candidates for future ASD space power systems

The struggle for control over the voices of the past and the socializing role of precolonial history: perspectives on the production of precolonial educative materials

Paper presented at the Wits History Workshop: The Making of Class, 9-14 February, 198

Impact of thermal energy storage properties on solar dynamic space power conversion system mass

A 16 parameter solar concentrator/heat receiver mass model is used in conjunction with Stirling and Brayton Power Conversion System (PCS) performance and mass computer codes to determine the effect of thermal energy storage (TES) material property changes on overall PCS mass as a function of steady state electrical power output. Included in the PCS mass model are component masses as a function of thermal power for: concentrator, heat receiver, heat exchangers (source unless integral with heat receiver, heat sink, regenerator), heat engine units with optional parallel redundancy, power conditioning and control (PC and C), PC and C radiator, main radiator, and structure. Critical TES properties are: melting temperature, heat of fusion, density of the liquid phase, and the ratio of solid-to-liquid density. Preliminary results indicate that even though overalll system efficiency increases with TES melting temperature up to 1400 K for concentrator surface accuracies of 1 mrad or better, reductions in the overall system mass beyond that achievable with lithium fluoride (LiF) can be accomplished only if the heat of fusion is at least 800 kJ/kg and the liquid density is comparable to that of LiF (1880 kg/cu m

The Benefits of a Grief and Loss Program With a Unique Technological Intervention

The grief process, difficult for anyone, is especially challenging for children and adolescents because they integrate loss differently from adults both in terms of cognition and emotion (Webb, 2011). Studies have found that bereaved children and adolescents are at high risk for depressive symptoms, anxiety, somatic complaints, and academic difficulties, compared with children and youth who are not grieving (Cohen & Mannarino, 2004; Dowdney, 2000). It is therefore important to provide effective intervention. While researchers have found age-appropriate and developmentally relevant strategies that help children and adolescents navigate the grief process (Rosner, Kruse, & Hagl, 2010; Sandler et al., 2010), additional data-based studies to explore optimal therapeutic services for these youth can provide new choices. This chapter contains a review of existing developmentally based models used to conceptualize children\u27s grief processes and a discussion of empirical studies concerning child and adolescent adaptation to loss, with a special focus on our recent study of a novel technological intervention. The chapter also includes a discussion of directions for future work