Effects of electric fields on ultracold Rydberg atom interactions

The behaviour of interacting ultracold Rydberg atoms in both constant electric fields and laser fields is important for designing experiments and constructing realistic models of them. In this paper, we briefly review our prior work and present new results on how electric fields affect interacting ultracold Rydberg atoms. Specifically, we address the topics of constant background electric fields on Rydberg atom pair excitation and laser-induced Stark shifts on pair excitation.

Evidence of a Ca(2+)-(center dot)NO-cGMP signaling pathway controlling zoospore biogenesis in the aquatic fungus Blastocladiella emersonii

The sporulation stage of the aquatic fungus Blastocladiella emersonii culminates with the formation and release to the medium of a number of zoospores, which are motile cells responsible for the dispersal of the fungus. The presence in the sporulation solution of 1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), a potent and selective inhibitor of nitric oxide-sensitive guanylyl cyclases, completely prevented biogenesis of the zoospores. In addition, this compound was able to significantly reduce cGMP levels, which increase drastically during late sporulation, suggesting the existence of a nitric oxide-dependent mechanism for cGMP synthesis. Furthermore, increased levels of nitric oxide-derived products were detected during sporulation by fluorescence assays using DAF-2 DA, whose signal was drastically reduced in the presence of the nitric oxide synthase inhibitor N omega-Nitro-L-arginine methyl ester (L-NAME). These results were confirmed by quantitative chemiluminescent determination of the intracellular levels of nitric oxide-derived products. A putative nitric oxide synthase (NOS) activity was detected throughout sporulation, and this enzyme activity decreased significantly when L-NAME and 1-[2-(Trifluoromethyl)phenyl]imidazole (TRIM) were added to the assays. NOS assays carried out in the presence of EGTA showed decreased enzyme activity, suggesting the involvement of calcium ions in enzyme activation. Additionally, expressed sequence tags (ESTs) encoding putative guanylyl cyclases and a cGMP-phosphodiesterase were found in B. emersonii EST database (http://blasto.iq.usp.br), and the mRNA levels of the corresponding genes were observed to increase during sporulation. Altogether, data presented here revealed the presence and expression of guanylyl cyclase and cGMP phosphodiesterase genes in B. emersonii and provided evidence of a Ca(2+)-(center dot)NO-cGMP signaling pathway playing a role in zoospore biogenesis. (C) 2009 Elsevier Inc. All rights reserved.

Actitudes hacia el catalán : un estudio sociolingüístico de principiantes del catalán en Barcelona

This study focuses on the Catalan language of Catalonia, a region located in the east of Spain. There are many immigrants living in this region who decide to learn the Catalan language in hope of finding a job or to integrate in the Catalan society. The main aim of this study was to discover the types of language attitudes the beginners of Catalan show towards this language (general, instrumental and integrative attitudes). Language attitudes are of importance because it can indicate the “health” of a minority language, such as is usually considered Catalan. The method applied was direct, where the informants had to answer a written questionnaire. The results of the study show positive attitudes towards the Catalan language and its general use in Catalonia. The main conclusions of the study were that the informants showed positive and slightly more instrumental attitudes towards Catalan, indicating that the main motive of learning the language was more of practical use than integrative motives.

A Note on Proxy Variables and Instrument Variable Regression

This is a note about proxy variables and instruments for identification of structural parameters in regression models. We have experienced that in the econometric textbooks these two issues are treated separately, although in practice these two concepts are very often combined. Usually, proxy variables are inserted in instrument variable regressions with the motivation they are exogenous. Implicitly meaning they are exogenous in a reduced form model and not in a structural model. Actually if these variables are exogenous they should be redundant in the structural model, e.g. IQ as a proxy for ability. Valid proxies reduce unexplained variation and increases the efficiency of the estimator of the structural parameter of interest. This is especially important in situations when the instrument is weak. With a simple example we demonstrate what is required of a proxy and an instrument when they are combined. It turns out that when a researcher has a valid instrument the requirements on the proxy variable is weaker than if no such instrument exists

Real time video segmentation for recognising paint marks on bad wooden railway sleepers

Wooden railway sleeper inspections in Sweden are currently performed manually by a human operator; such inspections are based on visual analysis. Machine vision based approach has been done to emulate the visual abilities of human operator to enable automation of the process. Through this process bad sleepers are identified, and a spot is marked on it with specific color (blue in the current case) on the rail so that the maintenance operators are able to identify the spot and replace the sleeper. The motive of this thesis is to help the operators to identify those sleepers which are marked by color (spots), using an “Intelligent Vehicle” which is capable of running on the track. Capturing video while running on the track and segmenting the object of interest (spot) through this vehicle; we can automate this work and minimize the human intuitions. The video acquisition process depends on camera position and source light to obtain fine brightness in acquisition, we have tested 4 different types of combinations (camera position and source light) here to record the video and test the validity of proposed method. A sequence of real time rail frames are extracted from these videos and further processing (depending upon the data acquisition process) is done to identify the spots. After identification of spot each frame is divided in to 9 regions to know the particular region where the spot lies to avoid overlapping with noise, and so on. The proposed method will generate the information regarding in which region the spot lies, based on nine regions in each frame. From the generated results we have made some classification regarding data collection techniques, efficiency, time and speed. In this report, extensive experiments using image sequences from particular camera are reported and the experiments were done using intelligent vehicle as well as test vehicle and the results shows that we have achieved 95% success in identifying the spots when we use video as it is, in other method were we can skip some frames in pre-processing to increase the speed of video but the segmentation results we reduced to 85% and the time was very less compared to previous one. This shows the validity of proposed method in identification of spots lying on wooden railway sleepers where we can compromise between time and efficiency to get the desired result.

The Passionate Combining Entrepreneurs

Entrepreneurs are portrayed as salient drivers of regional development and for a number of years nascent entrepreneurs have been studied in a large number of countries as part of the Global Entrepreneurship Monitor project and the Panel Study of Entrepreneurial Dynamics. Scholars have devoted much effort to investigating factors that determine how individuals engage in entrepreneurial activities, with most of the discussion limited to business start-ups. However, since this type of project does not follow identical nascent entrepreneurs over time, limited knowledge exists about their development and whether they stay in this nascent phase for a long time. In practice, it is common for entrepreneurs to run a business and at the same time work in wage work, so-called combining entrepreneurs. In Sweden, almost half of all business owners combine wage work with a business. However, not all combining entrepreneurs will eventually decide to leave the wage work and invest fully in the business. Consequently, much research has focused on the first step of entering entrepreneurship full time, but less has focused on the second step, the transition from the combining phase to full-time self-employment. The aim of this thesis is therefore to contribute to the theory of entrepreneurship by gaining a deeper understanding of combining entrepreneurs and their motives and intentions.   In the context of combining entrepreneurs, the theory of identity, resources and choice overload has been used to examine how entrepreneurs’ age (when starting the business), entrepreneurial tenure (the length of engagement in the side-business), hours spent (weekly involvement in the side-business), involvement in entrepreneurial teams (leading the business with one or more partners) and involvement in networks (business networks) influence their passion for engaging in entrepreneurship while sustaining wage work. Different categories of combining entrepreneurs and their intentions have also been examined.   A survey was administered to 1457 entrepreneurs within the creative sector in two counties in Sweden (Gävleborgs County and Jämtlands County). Since there were no separate mailing lists to only combining entrepreneurs, the survey was sent to all entrepreneurs within the chosen industry and counties. The total response rate was 33.5 percent and of them 57.6 percent combined, yielding 262 combining entrepreneurs who answered the questionnaire. The survey was then followed up with eight focus group interviews and two single interviews to validate the answers from the questionnaire.   The results indicate three types of combining entrepreneurs: nascent – with the intention to leave the combining phase for a transition into full-time self-employment, lifestyle – with the intention to stay in the combining phase, and occasional – with the intention to leave the combining phase for full-time wage work and close down the business. Transitioning fully to self-employment increases with the individual’s age. Also, a positive interactive effect exists with involvement in entrepreneurial networks. The results also indicate that the ability to work with something one is passionate about is the top motive for combining wage work with a side-business. Passion is also more likely to be the main motive behind the combining form among individuals who are older at business start-up, but passion is less likely to be the main motive behind the combining form among individuals who spend more time on the business. The longer the individual has had the side-business, the less likely passion is the main motive behind the combining form, and passion is less likely to be the main motive among those who are part of an entrepreneurial team.

Banning information as a redistributive device

In this paper we analyze the optimality of allowing firms to observe signals of workers’ characteristics in an optimal taxation framework. We show that it is always optimal to prohibit signals that disclose information about differences in the intrinsic productivities of workers like mandatory health exams and IQ tests, for example. On the other hand, it is never optimal to forbid signals that reveal information about the comparative advantages of workers like their specialization and profession. When signals are mixed (they disclose both types of information), there is a trade-off between efficiency and equity. It is optimal to prohibit signals with sufficiently low comparative advantage content.

A inteligência competitiva como difusora da ação estratégica: diagnóstico do setor vinícola de Bento Gonçalves - RS

The transformation that occurs in the scenery of the companies at this moment, leads them to a competitive environment, making exist more demands of the organizations, turning them more efficient. The companies search each time for more knowledge to follow this transformation, existing the concerning in the adequate way of arranging an organizational strategy that really works. The companies that really get to stand out through a clear, flexible and evolutive strategy have some strength that leads them, followed by directed information to the development of this strategy. This essay analyses the competitive intelligence of the winegrowing sector of Bento Gonçalves, through the establishment of the variable motive-power, organizational strategy and distinguished information. This way, we seek to make a research of this sector improving its peculiarities. The essay starts with the definition of the problem, characterizing the sector through a historic, problem and studied theme. On the theoretical reference, there is an evolution through the variable considered vital to the instauration of the competitive intelligence, beginning from the information to motive-power, organizational strategy, to the strategic information directed to the action. The results of this essay are in a chapter (Competitive Intelligence Analysis), which has the objective to analyze the research through a diagnosis of the winegrowing sector. This essay evaluates the winegrowing sector of Bento Gonçalves, with clear and defined strategies according to its objectives, but it¿s still not achieving in its greatest part to establish an organizational competitive intelligence.

Sistema de gestão logística e patrimonial do SESC: um estudo de caso

Este estudo teve como objetivo avaliar se o Sistema de Gestão Logística e Patrimonial (SLP) desenvolvido pela Administração Nacional do SESC, atende às necessidades de suas Administrações Regionais, apontando elementos positivos e negativos. Envolvendo as áreas de logística de suprimentos, logística interna e gestão de bens móveis pennanentes, o estudo teve também como objetivo estabelecer metodologia de avaliação, visto que não se encontrou caso similar aplicado em organizações prestadoras de serviços. A metodologia tratou de aspectos gerais relacionados a maior significância das atividades de recursos humanos, a eficiência das tarefas e a qualidade e segurança das infonnações, tudo resultado da utilização de tecnologia de infonnação. De fonna mais específica, a metodologia tratou de pontos focais das áreas que compõem o estudo: infonnação, cadastro, processamento, monitoramento, recebimento e planejamento. Incluiu-se ainda no método, avaliação sobre a necessidade de desenvolvimento de módulo de logística de distribuição no SLP. Os resultados do estudo evidenciaram que o SLP atende às necessidades das Administrações Regionais do SESC, que a necessidade de desenvolvimento do módulo de logística de distribuição deve ser melhor analisada e que a metodologia se mostrou viável e deve ser motivo de novas pesquisas em organizações prestadoras de serviços, inclusive no SESC, visto que o modelo gera impactos no gerenciamento da atividade logística e patrimonial.

Desenvolvimento de analisadores virtuais aplicados a colunas de destilação industriais

Nas indústrias de processo, algumas variáveis como as composições de topo de colunas de destilação são quantificadas através de análises laboratoriais e ou de analisadores em linha. Este tipo de controle apresenta algumas limitações tais como custos de manutenção e o tempo de amostragem (em geral análises laboratoriais ocorrem de 1 a 3 vezes ao dia). Para melhoria destes métodos, as variáveis podem ser continuamente estimadas a partir de sua relação com as variáveis medidas diretamente no processo. Através de um algoritmo matemático, um analisador virtual de propriedades pode ser construído, sendo necessário para o seu desenvolvimento um modelo simplificado do processo. Este trabalho teve como objetivo a construção de dois analisadores virtuais para estimação das composições de topo de duas colunas fracionadoras de tolueno presentes em uma indústria petroquímica. Para tal, estudou-se as metodologias existentes para construção de analisadores voltados para aplicações em colunas de destilação. O desenvolvimento de analisadores virtuais tem como base três etapas: seleção de variáveis secundárias, construção de modelos e correção/adaptação de modelos. Tais etapas, baseadas principalmente em métodos estatísticos, foram estudadas e as técnicas que melhor se adaptaram ao caso em questão foram empregadas com resultados satisfatórios. Realizaram-se também estudos comparativos entre modelos estacionários e dinâmicos e modelos construídos a partir de dados de simulação e de processo. As simulações foram conduzidas nos softwares Aspen PlusÒ e Aspen DynamicsÒ e o software usado para implementação dos analisadores na indústria foi o Aspen IQÒ.

Desafios para a formação de parcerias no serviço creche da secretaria da assistência social da PMSP

Analisa os vínculos estabelecidos entre a Secretaria de Assistência Social da PMSP e algumas Entidades Sociais para a prestação do serviço creche. Investigou-se o campo da Assistência Social e o da relação entre a esfera pública estatal e a esfera privada, sem fins lucrativos, na provisão de serviços públicos. A partir de revisão bibliográfica, de pesquisa documental e de estudo de casos, dando voz a todos que se relacionam no convênio, definiu-se parcerias como sendo relações substantivas que implicam corresponsabilidades, compartilhamento de valores e comprometimentos. Analisou-se duas creches diretas, duas conveniadas e duas indiretas, (e as respectivas Entidades Sociais), além da SAS Regional de IQ/G e SAS Central. Foram escolhidas as creches que obtiveram avaliação positiva quanto ao seu desempenho e alcance de resultados. Considerou-se que tanto os serviços prestados de forma direta quanto os conveniados podem ter qualidade e sucesso no alcance de seus objetivos, sendo necessário, em qualquer das modalidades, ter presente aspectos como: transparência nas ações, diálogos permanentes, clarificação de papéis e competências, responsabilização e compromissos com causas e com acordos. Justificam-se os serviços conveniados em razão das questões conjunturais hoje postas, e da responsabilização por parte de toda uma sociedade no enfrentamento da questão social. Justificam-se os serviços diretos pela necessidade vital da afirmação do papel do Estado na provisão de serviços públicos para garantia de serviços de forma continuada com vistas à universalização. Indicou-se, como desafio a necessidade de rever a forma como estão se dando os vínculos entre os agentes estudados, na direção do estabelecimento de parcerias, bem como o desafio da apropriação da condução da política pública pelos órgãos de assistência social, consolidando como esfera pública não-estatal a ação das Entidades Sociais.

Mudanças climáticas: um caminho para a avaliação da política pública brasileira para o setor

Diante da relevância da questão das mudanças climáticas para o mundo, esta dissertação tem por objetivo a avaliação da atual política pública brasileira para o tema. Partindo da análise da atual política ambiental brasileira, examina os programas e ações do país voltados para as mudanças climáticas, pesquisa o desenvolvimento dos projetos de Mecanismo de Desenvolvimento Limpo no Brasil, e avalia a sua atual política pública de mudanças climáticas. Essa avaliação, embora a complexidade do tema, utiliza metodologia caracterizada ao mesmo tempo por sua riqueza e simplicidade, qual seja, a metodologia de avaliação de políticas públicas desenvolvida por Oliveira e Martins (2003). Construída com base nas três principais dimensões a serem consideradas quando da avaliação de políticas públicas: dimensões social, econômica e política, a metodologia de Oliveira e Martins (2003) nesta pesquisa é adaptada para receber, em cada dimensão, atributos (variáveis), e seus respectivos indicadores, relacionados com a questão das mudanças climáticas no Brasil. Selecionados os atributos são inseridos ponderadores com base em pesquisa de campo, em que os entrevistados têm a liberdade de expor as suas preferências. Extendendo-se até o nível de avaliação intermediário da metodologia de avaliação de Oliveira e Martins (2003), esta pesquisa revela como é possível avaliar a política pública brasileira de mudanças climáticas, e quiçá servirá de motivação ao contínuo desenvolvimento do modelo aqui proposto, a fim de servir como mais um instrumento de participação direta da sociedade na definição do rumo que o Brasil deve seguir nas questões climáticas, e que inclusive outras regiões do mundo poderão vir a adotar, dada a flexibilidade de contextualização da referida metodologia de avaliação.

Os recursos humanos e a gestão pela qualidade total

No presente trabalho observaremos que a qualidade total é um modo de vida organizacional, uma nova forma de fazer as coisas; é uma revolução no modo das organizações lidarem com seus empregados, superando a visão meramente técnica de gestão empresarial. Está findo o tempo em que administrava-se somente finanças, tecnologias, processos e pessoas. É preciso criar um ambiente de trabalho que motive a todos a contribuir com a organização na busca da qualidade total. No contexto atual, a formulação das políticas de recursos humanos, já integradas com o negócio, filosofia e os objetivos de qualquer organização, é condição fundamental e indispensável na busca da excelência, qualidade e do atingimento de altos níveis de produtividade. Ao longo do trabalho, expomos a origem e o desenvolvimento das correntes de pensamento que formaram os conceitos de qualidade total bem como a repercussão no planejamento e desenvolvimento de recursos humanos nas organizações e as conseqüências ante o processo de globalização da economia. Ao final, desenvolvemos pesquisa que procurou demonstrar até que ponto os conceitos e práticas de qualidade total permearam os setores de recursos humanos dos Tribunais Superiores brasileiros.

Fiscal multipliers in an incomplete markets economy

This paper studies the behavior of fiscal multipliers in two different economic environments: complete markets and incomplete markets. Based on steady state analysis, output multipliers are found within a range between 0.49 and 0.66, when the markets are complete. Under incomplete markets, output multiplier was found in an interval between 0.75 and 0.94. These results indicates that the market structure, which reflects the degree of risk sharing and the intensity of the precautionary motive faced by individuals, plays a key role in determining the fiscal multipliers. In the second part of the paper, was performed an exercise to analyze the dynamic response of macroeconomic aggregates to an exogenous and unexpected rise in government spending financed by lump-sum taxes. In this case, impact output multipliers varies in a range between 0.64 and 0.68, under complete markets, and within 1.05 and 1.20 when markets are incomplete. The results found under incomplete markets are very close to that found on related literature which usually uses an econometric approach or calibrated/estimated New Keynesian models. These results shows that taking into account the deficiencies in the insurance mechanisms can be an interesting way to reconcile theoretical models with the results found on related current literature, without the need of ad-hoc assumptions relative to price stickness.

Growing research where economies grow: essays on strategy and international expansion of companies from emerging countries

In recent years, emerging countries have assumed an increasingly prominent position in the world economy, as growth has picked up in these countries and slowed in developed economies. Two related phenomena, among others, can be associated with this growth: emerging countries were less affected by the 2008-2009 global economic recession; and they increased their participation in foreign direct investment, both inflows and outflows. This doctoral dissertation contributes to research on firms from emerging countries through four independent papers. The first group of two papers examines firm strategy in recessionary moments and uses Brazil, one of the largest emerging countries, as setting for the investigation. Data were collected through a survey on Brazilian firms referring to the 2008-2009 global recession, and 17 hypotheses were tested using structural equation modeling based on partial least squares. Paper 1 offered an integrative model linking RBV to literatures on entrepreneurship, improvisation, and flexibility to indicate the characteristics and capabilities that allow a firm to have superior performance in recessions. We found that firms that pre-recession have a propensity to recognize opportunities and improvisation capabilities for fast and creative actions have superior performance in recessions. We also found that entrepreneurial orientation and flexibility have indirect effects. Paper 2 built on business cycle literature to study which strategies - pro-cyclical or counter-cyclical – enable superior performance in recessions. We found that while most firms pro-cyclically reduce costs and investments during recessions, a counter-cyclical strategy of investing in opportunities created by changes in the environment enables superior performance. Most successful are firms with a propensity to recognize opportunities, entrepreneurial orientation to invest, and flexibility to efficiently implement these investments. The second group of two papers investigated international expansion of multinational enterprises, particularly the use of distance for their location decisions. Paper 3 proposed a conceptual framework to examine circumstances under which distance is less important for international location decisions, taking the new perspective of economic institutional distance as theoretical foundation. The framework indicated that the general preference for low-distance countries is lower: (1) when the company is state owned, rather than private owned; (2) when its internationalization motives are asset, resource, or efficiency seeking, as opposed to market seeking; and (3) when internationalization occurred after globalization and the advent of new technologies. Paper 4 compared five concurrent perspectives of distance and indicated their suitability to the study of various issues based on industry, ownership, and type, motive, and timing of internationalization. The paper also proposed that distance represents the disadvantages of host countries for international location decisions; as such, it should be used in conjunction with factors that represent host country attractiveness, or advantages as international locations. In conjunction, papers 3 and 4 provided additional, alternative explanations for the mixed empirical results of current research on distance. Moreover, the studies shed light into the discussion of differences between multinational enterprises from emerging countries versus those from advanced countries.