The effect of iron on liquid film migration and sintering of an Al-Cu-Mg alloy

Analytical transmission electron microscopy indicates that liquid film migration occurs during sintering of an Al-Cu-Mg alloy, that intragranular liquid pools develop from migrating films and that iron segregates to these pools. It is suggested that a high localised iron concentration retards the liquid film migration rate by reducing the coherency strain in the retreating grain, causing a region of the film to detach from the boundary, thus forming an intragranular pool in the advancing grain. Alloys with low iron levels develop few intragranular pools and have high sintered densities. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

Assessing moth migration and population structuring in Helicoverpa annigera (Lepidoptera : Noctuidae) at the regional scale: Example from the Darling Downs, Australia

Analysis of gene flow and migration of Helicoverpa armigera (Hubner) in a major cropping region of Australia identified substantial genetic structuring, migration events, and significant population genotype changes over the 38-mo sample period from November 1999 to January 2003. Five highly variable microsatellite markers were used to analyze 916 individuals from 77 collections across 10 localities in the Darling Downs. The molecular data indicate that in some years (e.g., April 2002-March 2003), low levels of H. armigera migration and high differentiation between populations occurred, whereas in other years (e.g., April 2001-March 2002), there were higher levels of adult moth movement resulting in little local structuring of populations. Analysis of populations in other Australian cropping regions provided insight into the quantity and direction of immigration of H. armigera adults into the Darling Downs growing region of Australia. These data provide evidence adult moth movement differs from season to season, highlighting the importance of studies in groups such as the Lepidoptera extending over consecutive years, because short-term sampling may be misleading when population dynamics and migration change so significantly. This research demonstrates the importance of maintaining a coordinated insecticide resistance management strategy, because in some years H. armigera populations may be independent within a region and thus significantly influenced by local management practices; however, periods with high migration will occur and resistance may rapidly spread.

Electronic dance music culture and religion: An Overview

This article provides a comprehensive and critical overview of existing research that investigates (directly and indirectly) the religio-spiritual dimensions of electronic dance music culture (EDMC) (from disco, through house, to post-rave forms). Studies of the culture and religion of EDMC are explored under four broad groupings: the cultural religion of EDMC expressed through 'ritual' and 'festal'; subjectivity, corporeality and the phenomenological dance experience (especially 'ecstasy' and 'trance'); the dance community and a sense of belonging (the 'vibe' and 'tribes'); and EDMC as a new 'spirituality of life'. Moving beyond the cultural Marxist approaches of the 1970s, which held youth (sub)cultural expressions as 'ineffectual' and 'tragic', and the postmodernist approaches of the early 1990s, which held rave to be an 'implosion of meaning', recent anthropological and sociological approaches recognise that the various manifestations of this youth cultural phenomenon possess meaning, purpose and significance for participants. Contemporary scholarship thus conveys the presence of religiosity and spirituality within contemporary popular cultural formations. In conclusion, I suggest that this and continuing scholarship can offer useful counterpoint to at least one recent account (of clubbing) that overlooks the significance of EDMC through a restricted and prejudiced apprehension of 'religion'.