Alternating heat transfer between objects of large geometrical difference

The heat transfer on the surface of an object in a gas fluidised bed is sequentially and alternately induced by particle-packet and gas bubble. This phenomenon is studied with computational simulation. The particle-packet and bubble are modelled by a double particle-layers and porous medium model and a hemispherical model, respectively. The heat transfer to and within the object is simulated concurrently. Different grid schemes are applied and different grid sizes are used in meshing the particle-packet and the object as there is a very large difference in their geometrical sizes. Based on theoretical analysis, an approximate method is developed to calculate the heat flux at the surface of the object. The simulation is implemented in a CFD package and the results are compared with experiments.

More than a game : the impact of sport-based youth mentoring schemes on developing resilience toward violent extremism

This paper draws upon the findings of an evaluation of “More than a Game”, a sport-focused youth mentoring program in Melbourne, Australia that aimed to develop a community-based resilience model using team-based sports to address issues of identity, belonging, and cultural isolation amongst young Muslim men in order to counter forms of violent ex-tremism. In this essay we focus specifically on whether the intense embodied encounters and emotions experienced in team sports can help break down barriers of cultural and religious difference between young people and facilitate ex-periences of resilience, mutual respect, trust, social inclusion and belonging. Whilst the project findings are directly rel-evant to the domain of countering violent extremism, they also contribute to a growing body of literature which con-siders the relationship between team-based sport, cross-cultural engagement and the development of social resilience, inclusion and belonging in other domains of youth engagement and community-building.

Teachers talking difference: teacher education and the poetics of anti-racism

This paper reports on a case study which explores the experiences of two teachers of ethnic difference working in secondary schools in rural Australia. In seeking an alternative way of telling their stories, transcript poems have been constructed from data obtained through semi-structured interviews with the teachers. The poems highlight the teachers' experiences of marginalisation and racism and their responses to their positioning in mainly white Anglo-Australian school communities. The study raises particular concerns about the effects of professional and cultural isolation on young and inexperienced teachers of ethnic difference as well as the need to view teacher education as an important site for the development of greater cultural awareness in "mainstream" teacher education students.

Making difference count: a demographic study of overseas born teachers

This article reports on the findings of a demographic study which is part of an Australian Research Council funded case study. It seeks to better understand the experiences and challenges facing teachers who are overseas born and educated non-native speakers of English. The investigation has been carried out in Victorian government metropolitan, regional city and rural secondary schools. A statewide survey has provided data about this previously `invisible' population of teachers, their demographic location, their qualifications, backgrounds and the nature of their teaching experiences. The findings raise a number of concerns in relation to overseas born teachers of ethnic difference in rural schools where cultural and professional isolation may be of particular concern. We explore some of the implications for teacher education in the light of increasing numbers of overseas born students entering teacher education courses.

Quantitative evaluation in health promotion : What's the difference?

This is the third in a series of articles on quantitative evaluation in health promotion written by Damien Jolley for the Health Promotion Journal of Australia. The first of these articles, published in the December 2000 issue, discussed the ideas behind sample surveys and how they can be used to improve evaluation of health promotion initiatives.1 The second, in the April 2001 issue, discussed confidence intervals in more detail and presented some strategies for computing confidence intervals for population percentages, both manually and using appropriate computer software. 2

Permutations with a distinct difference property

The topic of this paper arose out of a consideration of Costas sequences, which are used in sonar and radar applications. These sequences have the defining property that all differences of elements the same distance apart, are different. Several infinite families of Costas sequences are known; but there are many existence questions for length greater-or-equal to 32. In this article, we restrict ourselves to sequences with the weaker property that all adjacent differences are different. We give a recursive construction for these, as well as building several infinite families.

Translating difference: questions of representation in cross-cultural research encounters

This paper addresses questions of cross-cultural communication and represen tation as they arose in a longitudinal research project which sought to learn about the lives and concerns of older women. It focuses on the translations and mistranslations that occurred in narrative workshops where Australian researchers, who did not speak Vietnamese, worked with Australian Vietnamese women aged 55-74 and a translator to produce video diaries of the older women's everyday life. A number of workshop interactions around storytelling are examined to document the complexities that can arise when communities meet and interact across cultures. The aim is to 'come clean' about the problems of trying to conduct research without a common language and to suggest just how difficult translations and representations of culture really are and how easily preconceptions and cultural positionings interfere with the process of communication that is actually occurring.

Reconciling difference: art as reparation and healing

This paper demonstrates the way shamanism and psychoanalysis are deeply related as first signalled by Claude Lévi-Strauss. It then creates a context in which the question of body and mind, creativity and healing is discoursed in an interdisciplinary manner. An exposition of thinkers emerging from disparate disciplines will be used to show how aesthetic experience (both the production and the reception of art) results in reparation and healing. This relationship is not only relevant in therapeutic terms, but can also be extended to aesthetic practices which involve possible reconciliation of inner and outer conflict. The therapeutic involves an understanding of ways in which aesthetic practices recast western notions of the relationship between body and mind.

Reporting and the politics of difference : (non) disclosure on ethnic minorities

This article is based on two related research questions. First, what is the level of disclosure on ethnic minorities in the two sectors of the U.K. economy that historically have employed the most ethnic minorities: the banking and retail sectors? And secondly, what influences the (non)disclosure? It specifically investigates the level of disclosures from 1935 to 1998 and situates them within the changing social, political and economic context of this period. It is contended that the changing pattern of disclosure during this period can be understood with reference to changes in the political strategies for managing the threat of racism adopted by successive governments. The article provides some tentative theoretical reflections on the nature of the racism problematic and the way in which power may be seen to operate through (non)disclosure in this particular instance.

A new voice in a new place: musical encounters with a difference

Australian education providers at the university level are being challenged to be more inclusive of cultural diversity and associated knowledge systems in their curricula. This article reports on some findings of a research study that aimed to evaluate the introduction of African music to primary teacher education students and to provide them with a context for assimilating African music into their own teaching practice. This paper reports on my work as a music educator in sharing my different worlds of experience ‘with one voice’ in order to expand students’ local knowledge base. It also discusses the nature and applications of African music and demonstrates some aspects that correlate with Western music. Through a study of both Western and African pedagogies and repertoire, students were able to gain a more holistic perspective of the role of music in society and were able to contextualize and transfer epistemological and pedagogical insights from one society to another.

Economic freedom and economic growth: Does specification make a difference?

In this paper we apply meta-analytic techniques to the literature on the impact of economic freedom on economic growth and find an overall positive direct association between economic freedom and economic growth. A positive indirect effect of economic freedom on economic growth through the stimulation of physical capital is also identified. However, the literature is affected by specification bias with respect to controls for physical capital. The omission of physical capital results in larger estimates of the economic freedom–economic growth association. Further, the use of panel data leads to smaller estimates of the impact of economic freedom on economic growth. The meta-analysis is confirmed by primary cross-sectional and panel data analysis of 82 countries for the period 1970–1999.

Near-surface distributions of soil water and water repellency under three effluent irrigation schemes in a blue gum (Eucalyptus globulus) plantation

Water repellent soils are difficult to irrigate and susceptible to preferential flow, which enhances the potential for accelerated leaching to groundwater of hazardous substances. Over 5 Mha of Australian soil is water repellent, while treated municipal sewage is increasingly used for irrigation. Only if a critical water content is exceeded will repellent soils become wettable. To avoid excessive loss of water from the root zone via preferential flow paths, irrigation schemes should therefore aim to keep the soil wet enough to maintain soil wettability. Our objective was to monitor the near-surface water content and water repellency in a blue gum (Eucalyptus globulus) plantation irrigated with treated sewage. The plantation's sandy soil surface was strongly water repellent when dry. For 4 months, three rows of 15 blue gum trees each received no irrigation, three other rows received 50% of the estimated potential water use minus rainfall, and three more rows received 100%. During this period, 162 soil samples were obtained in three sampling rounds, and their water content (% dry mass) and degree of water repellency determined. Both high and low irrigation effectively wetted up the soil and eliminated water repellency after 2 (high) or 4 (low) months. A single-peaked distribution of water contents was observed in the soil samples, but the water repellency distribution was dichotomous, with 44% extremely water-repellent and 36% wettable. This is consistent with a threshold water content at which a soil sample changes from water repellent to wettable, with spatial variability of this threshold creating a much wider transition zone at the field scale. We characterized this transition zone by expressing the fraction of wettable samples as a function of water content, and demonstrated a way to estimate from this the wettable portion of a field from a number of water content measurements. To keep the plantation soil wettable, the water content must be maintained at a level at which a significant downward flux is likely, with the associated enhanced leaching. At water contents with negligible downward flux, the field is water repellent, and leaching through preferential flow paths is likely. Careful management is needed to resolve these conflicting requirements.

An empirical study of encoding schemes and search strategies in discovering causal networks

Efficiently inducing precise causal models accurately reflecting given data sets is the ultimate goal of causal discovery. The algorithm proposed by Wallace et al. [10] has demonstrated its ability in discovering Linear Causal Models from data. To explore the ways to improve efficiency, this research examines three different encoding schemes and four searching strategies. The experimental results reveal that (1) specifying parents encoding method is the best among three encoding methods we examined; (2) In the discovery of linear causal models, local Hill climbing works very well compared to other more sophisticated methods, like Markov Chain Monte Carto (MCMC), Genetic Algorithm (GA) and Parallel MCMC searching.