Interdiffusion in InGaAs/GaAs: The effect of growth conditions

Copyright 1998 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Journal of Applied Physics 84, 232 (1998) and may be found at

In-migrants and exclusion in east African rangelands: access, tenure and conflict

East African rangelands have a long history of population mobility linked to competition over key resources, negotiated access, and outright conflict. Both in the literature and in local discourse, in-migration is presented as leading to increased competition, driving poverty and social exclusion on the one hand, and conflict and violence on the other. Current analyses in developing countries identify economic differences, ethnic fault lines, ecological stresses and a breakdown in state provision of human and constitutional rights as factors in driving conflict. The present paper explores this interaction of in-migration and conflict with respect to Kenyan and Tanzanian pastoralist areas and populations. Using quantitative and qualitative methods, patterns of resource access and control in Kenya and Tanzania Maasailand are explored in terms of the ways land and livestock are associated with migration status, ethnicity and wealth or political class. Contrasts and similarities between the two national contexts are used to develop a better understanding of the ways these factors operate under different systems of tenure and access. The conclusion briefly considers implications of these patterns, their potential for exacerbating poverty, and policies for minimising social exclusion and conflict in East African rangelands. / Abstract in French: Les prairies d'Afrique orientale connaissent depuis longtemps une mobilité des populations, liée aux problèmes de concurrence pour les ressources clés, d'accès négocié et de conflits pures et simples. Dans la littérature comme dans le discours local, l'immigration interne est présentée comme cause de concurrence accrue, motrice de pauvreté et d'exclusion sociale d'une part, et de conflit et de violence d'autre part. Des analyses menées actuellement dans les pays en développement identifient comme facteurs moteurs de conflit des écarts économiques, des failles ethniques, des tensions écologiques et une détérioration des droits humains et constitutionnels. Cet article examine l'interaction entre immigration interne et conflit au sein des régions et populations pastorales du Kenya et de la Tanzanie. Il utilise des méthodes quantitatives et qualitatives pour étudier les modèles d'accès et de contrôle des ressources dans le pays masaï du Kenya et de la Tanzanie en termes d'association des terres et du bétail au statut d'immigration, à l'ethnicité et à la catégorie de richesse ou politique. Les contrastes et similarités entre les deux contextes nationaux servent à mieux comprendre le mode de fonctionnement de ces facteurs dans des régimes fonciers et systèmes d'accès différents. La conclusion examine brièvement les implications de ces modèles, leur capacitéà exacerber la pauvreté et les politiques de minimisation de l'exclusion sociale et des conflits dans les prairies d'Afrique orientale

Intermixing in GaAsSb/GaAs single quantum wells

Copyright 1998 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Journal of Applied Physics 84, 4017 (1998) and may be found at

Rethinking ribbed stones: Defining a Northwest Coast artifact class

Ribbed stones are ground stone artifacts found primarily at archaeological sites in Prince Rupert Harbour and canyons along the Skeena and Bulkley Rivers. All have deeply incised grooves that extend across at least one face of the artifact, creating a characteristic ribbed pattern of raised bands. This thesis presents an artifact class definition and morphological classification system for ribbed stones, based on the analysis of 31 specimens. Used to describe and interpret the artifact class, the system is based on physical attributes related to form. This approach, while useful, was unable to directly incorporate contextual insights shared by two Gitxsan and Wet’suwet’en community members. In response to this limitation, a second classification system, referred to as “circles of belonging,” was developed as a complementary method of artifact classification that may more easily engage with community derived insights and information

Book review of “Conservation and Community in Kenya: Milking the Elephant” by Carolyn Lesorogol

Book review of Conservation and Community in Kenya: Milking the Elephant by Carolyn Lesorogol. Lanham, Boulder, New York, London: Lexington. 2022. ISBN 9781793650290; e-ISBN 9781793650306

Turned On / Turned Off: Speculating on the Microchip-based Contraceptive Implant

For over 50 years, hormone-based contraceptives have allowed women to control their fertility, thus reconfiguring society and how women relate to their body. On the horizon are long-life microchip-based implanted contraceptives that can be turned on and off, which may further the societal disruptions of "the pill". Framed as interactive technology, we speculate on the design space of controllable implanted contraceptives. We explored existing implanted contraceptives through a performance ethnography of their implantation. Inspiration from this process informed a speculative video of living with controllable implants and a guide for healthcare professionals. These materials, along with expert presentations, backgrounded a design workshop in which participants unpacked issues around controllable contraceptive implants. Participants created and roleplayed physical mock-ups of controllers, manifesting discussions around security, relationships and hormones. Drawing from the outcomes of the workshop, we produce a speculative design in the form of a film and physical mock-ups