3,005 research outputs found
Podcast: Towards a Tranformative Epistemology of Technology Education
No full textThis podcast, recorded by the author of the paper, discusses some of the key thinking and ideas in: Morrison-Love, D. (2016) Towards a transformative epistemology of technology education. Journal of Philosophy of Education, Vol 50, Issue 4 (In Press). Core ideas include the relationship between technical activity, materials and the metaphorical paradigm of technology as an enhancement to human capability. Ultimately, it is argued that pupils’ technological knowledge arises in no small part, from their navigation of an ontological pathway through which they realise solutions to problems in a physical form
Point contact studies of rare earth-transition metal compounds
No full textMechanical point contact techniques have been used to study the spin-dependent properties of rare earth-transition metal compounds and transition metal thin films and bi-layers. The transport spin polarisation of Cu, Co and Fe has been measured using point contact Andreev reflection (PCAR), and found to be in good agreement with previous results. In addition, bi-layers of Co/Y and Co/Cu have been used to
demonstrate suppression of the spin polarisation of the Co underlayer via a nonmagnetic capping layer. The spin diffusion length of Cu has been estimated to be larger than 600nm. The spin polarisation of molecular beam epitaxy (MBE) deposited
RFe2 (R = Dy,Y,Er) Laves phase intermetallic films was determined, and found to be close to that of Fe. This suggests that the spin transport behaviour in these materials is
dominated by the Fe sub-lattice. Preliminary evidence for spin transfer torque effects in an RFe2 multilayer and tri-layer is also presented and discussed. Point contact measurements of an ErFe2/YFe2 multilayer at 4.2K show a step in the differential
resistance at a positive current value. It is suggested that this is due to the formation of a nano-domain beneath the tip. Measurements of a DyFe2/YFe2/DyFe2 tri-layer show
peaks in differential resistance for negative applied currents. This is tentatively attributed to the generation of spin waves within the YFe2 layer
Growth management and open space protection in Arizona : current tools and progress
No full textabstract: Four major statewide "tools" to help manage growth and preserve open space have been put to work in Arizona over the past five years. These include the Arizona Preserve Initiative and the closely-related Proposition 303, as well as the Growing Smarter Act and its "addendum," Growing Smarter Plus. All four tools are based in large part on a concept known as "smart growth," which is generally considered to be a set of growth management measures that attempt to strike a balance among issues of economics, environment, and quality of life. Taken together, these four growth management tools make significant changes in the way that (a) city and county governments plan and regulate their lands, (b) citizens play a role in land use issues, (c) state trust lands are managed, and (d) open space may be acquired and preserved. Many of these changes will have long-term effects for the state. This paper provides a brief overview of each of the four growth management/open space tools, a preliminary accounting of major activities each one has stimulated, and a perspective on what can be expected for the future as expressed by a selection of growth planners and other leaders of growth management in Arizona.Copyright by the Arizona Board of Regents for and on behalf of Arizona State University and its Morrison Institute for Public Polic
Intelligent maritime UAV catapult robot, detection & tracking using fast SLAM: A feasibility study
No full textDavid Burns, Lee Lawson, Christopher Morrison and Amir Anva
A politics of conversion: nihilism and love in Toni Morrison's fiction
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-Graduação em Letras.O estudo Uma Política de Conversão: Niilismo e Amor na Ficção de Toni Morrison começa com a idéia de que a Literatura Afro-Americana apresenta um sentido de auto-reflexividade e hibridismo, através do qual autobiografia dialoga com romance, o espiritual se funde com o político. A partir deste traço dialógico a auto-reflexividade é politicamente estabelecida entre niilismo e amor. Na política de conversão, o estudo analisa as formas como mulheres negras, individualmente ou em grupo, fogem da escravidão para a liberdade, avançam da individualidade para a coletividade, ou substituem niilismo por amor. Metodologicamente o estudo apresenta sete capítulos. O primeiro discute os aspectos dialógicos que ilustram as conexões entre narrativas espirituais, de escravos e ficção, entre espiritualidade e política. O segundo examina o diálogo entre a conversão, pregação pública e formação da comunidade em Diário e Experiências Religiosas de Lee. O capítulo sugere que ao afirmar espiritualidade e humanidade a narradora abre profundo espaço para a mulher negra reclamar direitos civis. O terceiro discute o diálogo no interior da política de conversão entre narrativa de escravos e ficção. Este diálogo lida com niilismo e amor em Incidentes de Jacobs e Amada, Sula e O Olho Mais Azul de Morrison. Para a análise de niilismo e amor valores individuais e coletivos são considerados em relação a cinco aspectos: ambiente e agente antagonistas, agente de apoio, propósito da personagem e resultado alcançado. É visível, no estudo, o apoio que certas mulheres recebem de suas comunidades para contra-atacar antagonistas. O apoio nem sempre resulta na superação do niilismo e, por isso, derrota temporária pode ocorrer antes que elas sejam reintegradas à comunidade, como acontece com Linda Brent. O quarto capítulo examina as fraquezas e as energias da política da conversão e a reintegração de Sethe Suggs à comunidade de Bluestone Road. O quinto avalia como a comunidade de Bottom tenta controlar a individualidade de Sula Peace e como um grupo de mulheres lideradas por Nel Wrights consegue resgatar o espírito de independência da heroína. O sexto mostra como a política da conversão das mulheres de Lorain é incapaz de garantir a saúde mental de Pecola Breedlove, mas consegue criar um papel mais consistente para o grupo. No sétimo, a conclusão examina da relação dialética entre niilismo e amor ou auto-amor nas experiências dos indivíduos e dos grupos. O estudo sugere que em Incidentes a busca de Linda Brent por liberdade envolve elementos de autodestruição e de autoempoderamento. Da mesma maneira, o estudo conclui que em Amada o amor que Sethe Suggs tem para as suas crianças mata a própria filha, enfatizando, assim, o desejo de livrá-la da escravidão. Igualmente em Sula, a individualidade de Sula Peace não apenas limita, mas também expande as experiências do grupo, levando-o à emancipação. Finalmente, em O Olho Mais Azul a luta de Pecola Breedlove por amor e beleza reflete auto-ódio ao mesmo tempo em que reconstrói a auto-apreciação de toda a comunidade
Biocontrôle du mildiou de la pomme de terre par pseudomonas fluorescens LBUM636 producteur d'acide phénazine-1-carboxylique
No full textLe mildiou est la maladie la plus importante chez la pomme de terre (Solanum tuberosum) et cause des pertes économiques considérables. Cette maladie est casuée par Phytophthora infestans, un oomycète. L'utilisation des pesticides présentement disponibles contre cet agent pathogène est de moins en moins efficace, et c'est pourquoi on cherche à développer des méthodes alternatives pour le contrôler. Le biocontrôle, qui implique l'utilisation de micro-organismes bénéfiques capables de protéger la plante contre le développement d'une maladie, constitue une avenue intéressante pour tenter de contrôler le mildiou. Deux principaux mécanismes peuvent mener au biocontrôle d'agents pathogènes, soient l'antibiose et la stimulation des mécanismes de résistance chez la plante. Dans le cadre de cette étude, une rhizobactérie d'intérêt en biocontrôle appartenant aux Pseudomonas sp. (souche LBUM636), isolée dans notre laboratoire, et productrice d'acide phénazine-1-carboxylique (PCA), un composé antimicrobien, a été étudiée pour sa capacité à contrôler le mildiou de la pomme de terre. Des tests de confrontations in vitro ont été réalisés pour déterminer si la LBUM636, incapable de produire le PCA (mutation au niveau du gêne biosynthétique phzC) a permis d'isoler l'effet du PCA dans cette antibiose et démontrer que le PCA est largement impliqué dans cette interaction. Deux types de tests in vivo, le premier utilisant des tubercules isolés, et le second utilisant des plats de pommes de terre cultivées en chambre de croissance en sol agricole, ont également été réalisés pour étudier à la fois l'antibiose et la stimulation des mécanismes de résistance par LBUM636 (de types sauvage et mutant) lorsque inoculés chez la pomme de terre. L'antibiose a été étudiée en observant si une réduction des symptômes du mildiou pouvait être observée sur des tubercules suite à l'application de lLBUM636 (de types sauvage et mutant) et aussi en quantifiant les populations de P. infestans dans la rhizosphère des plantes cultivées en chambre de croissance par méthode indépendante de la culture utilisation la réaction de polymérase en chaîne quantitative (qPCR) et ciblant un gène unique à P. infestans. Une altération transcriptionnelle de gênes clés témoignant d'une stimulation des mécanismes de défense chez la plante par LBUM636 (de types sauvage et mutant), a quant à elle été étudiée par rétrotranscription de l'ARN extrait des feuilles et des racines (expérience en chambre de croissance) et de tubercules (expérience en tubercules), couplée à la réation polymérase en châine quantitative (RT-qPCR). Enfin, le génome complet de LBUM636 a été séquencé et annoté afin d'identifier et de caractériser certains gênes qui sont potentiellement impliqués dans l'interaction entre cet organisme et P. infestans.--Résumé.statement of responsibility: Christopher Morrison B.Sc. (biochimie).Thèse présentée à la Faculté des études supérieures et de la recherche en vue de l'obtention de la maîtrise ès sciences en biologie.thesis: M. Sc. (biologie). Université de Moncton 2016bibliography: Comprend des référence bibliographiques: feuilles 52-66.additional physical form: Également disponible en version électronique. Les pages contenant des informations personnelles ne sont pas reproduites.language: Thèse rédigée sous forme d'articles arbitrés, comprend du texte en français et en anglais
Why does inflammation persist: a dominant role for the stromal microenvironment?
No full textInflammatory responses occur within tissue microenvironments, with functional contributions from both haematopoietic (lymphocytic) cells and stromal cells (including macrophages and fibroblasts). These environments are complex--a compound of many different cell types at different stages of activation and differentiation. Traditional models of inflammatory disease highlight the role of antigen-specific lymphocyte responses and attempt to identify causative agents. However, recent studies have indicated the importance of tissue microenvironments and the innate immune response in perpetuating the inflammatory process. The prominent role of stromal cells in the generation and maintenance of these environments has begun to challenge the primacy of the lymphocyte in regulating chronic inflammatory processes. Sensible enquiries into factors regulating the persistence of inflammatory disease necessitate an understanding of the mechanisms regulating tissue homeostasis and remodelling during inflammation. This article highlights recent insights into the factors regulating dynamic aspects of inflammation, focusing particularly on mononuclear cell infiltrates, their interactions with stromal cells in tissues and the relevance of these interactions to existing and possible future therapies. A key feature of current research has been a growing appreciation that disordered spatial and temporal interactions between infiltrating immune cells and resident stromal cells lie at the heart of disease persistence
Reflecting on the role of emotions in the PhD process
No full textThis research project examined the role of emotions in the PhD process through an exploratory, qualitative, self reflective study by six recent or current PhD candidates. Despite differences in the nature of the PhD fields of study, and in the personal backgrounds of the participants, a number of common themes were recognised. We developed an interactive workshop for postgraduate students in which participants were asked to reflect on their emotional experiences in their own studies. The combined information from these sources was used to suggest some strategies for management of negative emotions that may arise during the PhD process. Of critical importance is the multiple roles of the PhD supervisor in helping manage the negative emotions that most PhD students inevitably experience at some stage in their candidature. Most important, though, is the role of self reflection in identifying potential emotional problems and their solutions; a process we recommend to PhD candidates and supervisors
Lactate and glucose as energy substrates during, and after, oxygen deprivation in rat hippocampal acute and cultured slices
No full textThe effects of raised brain lactate levels on neuronal survival following hypoxia or ischemia is still a source of controversy among basic and clinical scientists. We have sought to address this controversy by studying the effects of glucose and lactate on neuronal survival in acute and cultured hippocampal slices. Following a 1-h hypoxic episode, neuronal survival in cultured hippocampal slices was significantly higher if glucose was present in the medium compared with lactate. However, when the energy substrate during the hypoxic period was glucose and then switched to lactate during the normoxic recovery period, the level of cell damage in the CA1 region of organotypic cultures was significantly improved from 64.3 +/- 2.1 to 74.6 +/- 2.1% compared with cultures receiving glucose during and after hypoxia. Extracellular field potentials recorded from the CA1 region of acute slices were abolished during oxygen deprivation for 20 min, but recovered almost fully to baseline levels with either glucose (82.6 +/- 10.0%) or lactate present in the reperfusion medium (108.1 +/- 8.3%). These results suggest that lactate alone cannot support neuronal survival during oxygen deprivation, but a combination of glucose followed by lactate provides for better neuroprotection than either substrate alone
Memoirs of Adele Sarpy Morrison.
No full textGilt top edge.Author's autograph presentation copy."One hundred copies of this book have been privately printed for distribution among friends of the author."Mode of access: Internet
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