Number of particle creation and decoherence in the nonideal dynamical Casimir effect at finite temperature

In this work we investigate the dynamical Casimir effect in a nonideal cavity by deriving an effective Hamiltonian. We first compute a general expression for the average number of particle creation, applicable for any law of motion of the cavity boundary, under the only restriction of small velocities. We also compute a general expression for the linear entropy of an arbitrary state prepared in a selected mode, also applicable for any law of motion of a slow moving boundary. As an application of our results we have analyzed both the average number of particle creation and linear entropy within a particular oscillatory motion of the cavity boundary. On the basis of these expressions we develop a comprehensive analysis of the resonances in the number of particle creation in the nonideal dynamical Casimir effect. We also demonstrate the occurrence of resonances in the loss of purity of the initial state and estimate the decoherence times associated with these resonances. Since our results were obtained in the framework of the perturbation theory, they are restricted, under resonant conditions, to a short-time approximation. (C) 2009 Elsevier Inc. All rights reserved.

Tectonothermal evolution and exhumation history of the Paleozoic Proto-Andean Gondwana margin crust: The Famatinian Belt in NW Argentina

We studied the P-T-t evolution of a mid-crustal igneous-metamorphic segment of the Famatinian Belt in the eastern sector of the Sierra de Velasco during its exhumation to the upper crust. Thermobarometric and geochronological methods combined with field observations permit us to distinguish three tectonic levels. The deepest Level I is represented by metasedimentary xenoliths and characterized by prograde isobaric heating at 20-25 km depth. Early/Middle Ordovician granites that contain xenoliths of Level I intruded in the shallower Level II. The latter is characterized by migmatization coeval with granitic intrusions and a retrograde isobaric cooling P-T path at 14-18 km depth. Level II was exhumed to the shallowest supracrustal Level III, where it was intruded by cordierite-bearing granites during the Middle/Late Ordovician and its host-rock was locally affected by high temperature-low pressure HT/LP metamorphism at 8-10 km depth. Level III was eventually intruded by Early Carboniferous granites after long-term slow exhumation to 6-7 km depth. Early/Middle Ordovician exhumation of Level II to Level III (Exhumation Period I,0.25-0.78 mm/yr) was faster than exhumation of Level III from the Middle/Late Ordovician to the Lower Carboniferous (Exhumation Period II, 0.01-0.09 mm/yr). Slow exhumation rates and the lack of regional evidence of tectonic exhumation suggest that erosion was the main exhumation mechanism of the Famatinian Belt. Widespread slow exhumation associated with crustal thickening under a HT regime suggests that the Famatinian Belt represents the middle crust of an ancient Altiplano-Puna-like orogen. This thermally weakened over-thickened Famatinian crust was slowly exhumed mainly by erosion during similar to 180 Myr. (C) 2010 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Some classes of semisimple group (and loop) algebras over finite fields

We determine the structure of the semisimple group algebra of certain groups over the rationals and over those finite fields where the Wedderburn decompositions have the least number of simple components We apply our work to obtain similar information about the loop algebras of mdecomposable RA loops and to produce negative answers to the isomorphism problem over various fields (C) 2010 Elsevier Inc All rights reserved

Galois orders in skew monoid rings

We introduce a new class of noncommutative rings - Galois orders, realized as certain subrings of invariants in skew semigroup rings, and develop their structure theory. The class of Calms orders generalizes classical orders in noncommutative rings and contains many important examples, such as the Generalized Weyl algebras, the universal enveloping algebra of the general linear Lie algebra, associated Yangians and finite W-algebras (C) 2010 Elsevier Inc All rights reserved

Digitalisering av Universitetsservice kvalitetsstyrning genom programmet AutoFlowChart

Universitetsservice US-AB är ett tryckeri som specialiserat sig på akademiska trycksaker såsom avhandlingar, visitkort samt studentlitteratur.Sedan en tid tillbaka har företaget arbetat mot ISO 9001 standarden. De dokument som styr standarden har hittills förvarats i pärmar på de lokala kontoren. Detta har visat sig vara ineffektivt då det är lätt hänt att pärmarna bara blir stående och de anställda på grund av det inte hålls uppdaterade.Syftet med detta examensarbete är att göra dessa dokument mer användarvänliga genom programmet AutoFlowChart från Netforms. Arbetet resulterade i en HTML-sida som Universitetsservice US-AB kan använda i sitt intranät, vilket gör att medarbetarna får snabb och lätt åtkomst till alla dokument. Detta medför även att när dokumentationen uppdateras på intranätet får samtliga fyra kontor direkt åtkomst till uppdatering.Dokumenten skulle även utformas så att de blir mer lättlästa och får ett trevligare utseende. En fördjupning gjordes därförinom kvalitetsstyrning för att få en förståelse över hur dokumenten bör hanteras och utformas.

Performance evaluation of ventilation radiators

A ventilation radiator is a combined ventilation and heat emission unit currently of interest due to its potential for increasing energy efficiency in exhaust ventilated buildings with warm water heating. This paper presents results of performance tests of several ventilation radiator models conducted under controlled laboratory conditions.   The purpose of the study was to validate results achieved by Computational Fluid Dynamics (CFD) in an earlier study and indentify possible improvements in the performance of such systems. The main focus was on heat transfer from internal convection fins, but comfort and health aspects related to ventilation rates and air temperatures were also considered.   The general results from the CFD simulations were confirmed; the heat output of ventilation radiators may be improved by at least 20 % without sacrificing ventilation efficiency or thermal comfort.   Improved thermal efficiency of ventilation radiators allows a lower supply water temperature and energy savings both for heating up and distribution of warm water in heat pumps or district heating systems. A secondary benefit is that a high ventilation rate can be maintained all year around without risk for cold draught.

Negotiating collective and individual agency : a qualitative study of young women's reproductive health in rural India

The societal changes in India and the available variety of reproductive health services call for evidence to inform health systems how to satisfy young women's reproductive health needs. Inspired by Foucault's power idiom and Bandura's agency framework, we explore young women's opportunities to practice reproductive agency in the context of collective social expectations. We carried out in-depth interviews with 19 young women in rural Rajasthan. Our findings highlight how changes in notions of agency across generations enable young women's reproductive intentions and desires, and call for effective means of reproductive control. However, the taboo around sex without the intention to reproduce made contraceptive use unfeasible. Instead, abortions were the preferred method for reproductive control. In conclusion, safe abortion is key, along with the need to address the taboo around sex to enable use of "modern" contraception. This approach could prevent unintended pregnancies and expand young women's agency.

A Gestão de Relacionamento entre os Supermercados de Pequeno e Médio Porte e seus Fornecedores no Município de São Caetano do Sul

SILVA FILHO, José Ribamar Tomaz da. A gestão de relacionamento entre os supermercados de pequeno e médio porte e seus fornecedores no município de São Paulo. 2013. 117f. Dissertação (Mestrado em Administração)- Universidade Municipal de São Caetano do Sul, São Caetano do Sul, 2013.

A obra de José de Souza Martins e a reforma agrária no Brasil : uma leitura sociológica

A reflexão sobre o conhecimento produzido pelos autores que marcaram e influenciaram gerações de pesquisadores no Brasil é um instrumental teórico importante para o avanço do pensamento científico na Sociologia. Neste sentido, propõe-se analisar a problemática agrária a partir do Sociólogo brasileiro José de Souza Martins. Esse autor, em uma série de livros e artigos ao longo da sua trajetória intelectual, forneceu-nos vários conceitos e interpretações significativas sobre o mundo rural brasileiro. Assim, dada a importância da contribuição de José de Souza Martins para o tema dos processos agrários, este estudo procura analisar parte da obra do autor, especialmente aquela que trata da reforma agrária, do papel dos mediadores nesse processo e os conceitos-chave principais presentes em sua obra. Os capítulos que se seguem analisam algumas fases do autor, a partir do final da década de 1970 até período recente, buscando evidenciar e analisar, em sua trajetória intelectual, as suas inspirações teóricas, ou seja, os autores que se tornaram referências para a construção do seu conhecimento, os conceitos-chave que marcaram sua obra, o papel dos mediadores – como a Comissão Pastoral da Terra (CPT), o Movimento dos Trabalhadores Rurais Sem-Terra, os Partidos Políticos – e, finalmente, ao longo dessa trajetória, os fatos, acontecimentos que interferiram em suas análises Duas hipóteses nortearam este trabalho, sendo a primeira a importância de alguns conceitos-chave como a “renda fundiária”, na análise do autor, e a segunda dizendo respeito à atuação dos mediadores principais da reforma agrária. Tais hipóteses foram, ao longo do trabalho, comprovadas, pois o conceito de “renda fundiária” permanece como referencial na obra de Martins, refletindo os interesses conflitantes existentes no espaço rural. Além disso, segundo a análise do autor, os mediadores continuam a exercer, de uma forma ou de outra, a condução da reforma agrária baseados em concepções do marxismo ortodoxo, que tem como sujeito principal da História a classe operária. Finalmente, esta investigação pôde ser realizada através da seleção de algumas obras emblemáticas do autor.

Modelos condicionais de apreçamento de ativos com prêmios de risco macroeconômicos variantes no tempo

Analisamos a previsibilidade dos retornos mensais de ativos no mercado brasileiro em um período de 10 anos desde o início do plano Real. Para analisarmos a variação cross-section dos retornos e explicarmos estes retornos em função de prêmios de risco variantes no tempo, condicionados a variáveis de estado macroeconômicas, utilizamos um novo modelo de apreçamento de ativos, combinando dois diferentes tipos de modelos econômicos, um modelo de finanças - condicional e multifatorial, e um modelo estritamente macroeconômico do tipo Vector Auto Regressive. Verificamos que o modelo com betas condicionais não explica adequadamente os retornos dos ativos, porém o modelo com os prêmios de risco (e não os betas) condicionais, produz resultados com interpretação econômica e estatisticamente satis fatórios