Quantum measurement of coherent tunnelling between quantum dots

We describe the conditional and unconditional dynamics of two coupled quantum dots when one dot is subjected to a measurement of its occupation number by coupling it to a third readout dot via the Coulomb interaction. The readout dot is coupled to source and drain leads under weak bias, and a tunnel current flows through a single bound state when energetically allowed. The occupation of the quantum dot near the readout dot shifts the bound state of the readout dot from a low conducting state to a high conducting state. The measurement is made by continuously monitoring the tunnel current through the readout dot. We show that there is a difference between the time scale for the measurement-induced decoherence between the localized states of the dots, and the time scale on which the system becomes localized due to the measurement.

Stochastic Schrodinger equation approach to quantum noise in resonant tunneling current

We apply the quantum trajectory method to current noise in resonant tunneling devices. The results from dynamical simulation are compared with those from unconditional master equation approach. We show that the stochastic Schrodinger equation approach is useful in modeling the dynamical processes in mesoscopic electronic systems.

Dynamics of a mesoscopic charge quantum bit under continuous quantum measurement

We present the conditional quantum dynamics of an electron tunneling between two quantum dots subject to a measurement using a low transparency point contact or tunnel junction. The double dot system forms a single qubit and the measurement corresponds to a continuous in time readout of the occupancy of the quantum dot. We illustrate the difference between conditional and unconditional dynamics of the qubit. The conditional dynamics is discussed in two regimes depending on the rate of tunneling through the point contact: quantum jumps, in which individual electron tunneling current events can be distinguished, and a diffusive dynamics in which individual events are ignored, and the time-averaged current is considered as a continuous diffusive variable. We include the effect of inefficient measurement and the influence of the relative phase between the two tunneling amplitudes of the double dot/point contact system.

Effect of instructed extinction on verbal and autonomic indices of Pavlovian learning with fear-relevant and fear-irrelevant conditional stimuli

We investigated the effects of conditional stimulus fear-relevance and of instructed extinction on human Pavlovian conditioning as indexed by electrodermal responses and verbal ratings of conditional stimulus unpleasantness. Half of the participants (n = 64) were trained with pictures of snakes and spiders (fear-relevant) as conditional stimuli, whereas the others were trained with pictures of flowers and mushrooms (fear-irrelevant) in a differential aversive Pavlovian conditioning procedure. Half of the participants in each group were instructed after the completion of acquisition that no more unconditional stimuli were to be presented. Extinction of differential electrodermal responses required more trials after training with fear-relevant pictures. Moreover, there was some evidence that verbal instructions did not affect extinction of second interval electrodermal responses to fear-relevant pictures. However, neither fear-relevance nor instructions affected the changes in rated conditional stimulus pleasantness. This dissociation across measures is interpreted as reflecting renewal of Pavlovian learning.

Tendências contemporâneas da política de assistência social : uma análise das transformações ocorridas na concepção de assistência social no Brasil

O presente trabalho reúne os elementos que compõem a atual concepção de assistência social no Brasil, a partir da promulgação da constituição de 1988, quando a assistência social foi reconhecida pela primeira vez como direito de cidadania e dever legal do Estado, garantido pela Lei Suprema. Nesta lei, a assistência social pressupunha uma lógica de pleno emprego, destinada, portanto, prioritariamente aos incapazes para o trabalho. No entanto, em um contexto de desemprego estrutural esta passa a ser compreendida em termos de garantias de seguranças, buscando assumir a proteção social daqueles capazes para o trabalho, tendo em vista a deterioração do mercado de trabalho, restrição de oportunidades e de renda e o crescimento progressivo do desemprego e da informalidade. A ideia central é a de que se trata de uma descrição crítica da concepção de assistência social no Brasil, problematizando cada um de seus argumentos mais explícitos com o intuito de revelar uma intencionalidade vinculada à uma perspectiva de Estado. Utilizamos o termo concepção no sentido de conceber, pensar, sentir, entender ou interpretar algo. A assistência social, na atualidade, responde a um único processo que reúne aspectos históricos, econômicos, políticos, sociais e ideológicos e neste sentido, representa uma concepção de mundo e um projeto de sociedade, defendido pela classe dominante, pautado pela exploração do trabalho. A atual concepção de assistência social segue, portanto, uma nova forma de política social a partir da perspectiva de desenvolvimento humano e combate à pobreza em que a grande ênfase tem sido a de retirar as discussões e a intervenção na pobreza do âmbito da questão social, alocando-a nos indivíduos e em suas “incapacidades”. A assistência social ao assumir a responsabilidade ou coresponsabilidade no desenvolvimento de capacidades dos indivíduos sinaliza a tendência de uma nova concepção de bem-estar social.

Conditioning information in mutual fund performance evaluation: Portuguese evidence

We estimate and compare the performance of Portuguese-based mutual funds that invest in the domestic market and in the European market using unconditional and conditional models of performance evaluation. Besides applying both partial and full conditional models, we use European information variables, instead of the most common local ones, and consider stochastically detrended conditional variables in order to avoid spurious regressions. The results suggest that mutual fund managers are not able to outperform the market, presenting negative or neutral performance. The incorporation of conditioning information in performance evaluation models is supported by our findings, as it improves the explanatory power of the models and there is evidence of both time-varying betas and alphas related to the public information variables. It is also shown that the number of lags to be used in the stochastic detrending procedure is a critical choice, as it will impact the significance of the conditioning information. In addition, we observe a distance effect, since managers who invest locally seem to outperform those who invest in the European market. However, after controlling for public information, this effect is slightly reduced. Furthermore, the results suggest that survivorship bias has a small impact on performance estimates.

Measuring fund performance using multi-factor models: evidence for the Portuguese market

This paper examines the performance of Portuguese equity funds investing in the domestic and in the European Union market, using several unconditional and conditional multi-factor models. In terms of overall performance, we find that National funds are neutral performers, while European Union funds under-perform the market significantly. These results do not seem to be a consequence of management fees. Overall, our findings are supportive of the robustness of conditional multi-factor models. In fact, Portuguese equity funds seem to be relatively more exposed to smallcaps and more value-oriented. Also, they present strong evidence of time-varying betas and, in the case of the European Union funds, of time-varying alphas too. Finally, in terms of market timing, our tests suggest that mutual fund managers in our sample do not exhibit any market timing abilities. Nevertheless, we find some evidence of timevarying conditional market timing abilities but only at the individual fund level.

Prefácio

A tese de Mestrado com o título “A Proibição da Reformatio in Pejus: os efeitos processuais no direito processual penal e no direito das contraordenações”, é uma delas. Trata-se de tese com especial qualidade e muito útil ao leitor profissional e especializado das Ciências Jurídico-Criminais e portanto Constitucionais. Ou não fossem as garantias criminais o núcleo fundamental dos espaços e tempos de Direito, da democracia social: art. 32º/10 da Constituição da República Portuguesa: “10. Nos processos de contra-ordenação, bem como em quaisquer processos sancionatórios, são assegurados ao arguido os direitos de audiência e defesa.”; Abstract: The Master's thesis entitled "Prohibition of Reformatio in pejus: the legal proceedings in the criminal procedural law and the law relating to offenses", is one of them. It thesis with special quality and very useful to the professional and skilled reader of Legal and Criminal Sciences and therefore constitutional. Or were not criminal guarantees the fundamental core of the spaces and times of law, social democracy: art. 32/10 of the Portuguese Constitution: "10. In misdemeanor cases, as well as any disciplinary procedures, is guaranteed to the defendant the hearing and right of defense. ".

Sigilo da Correspondência e Privatizações

Estamos desde logo a falar de Direitos Fundamentais. De direitos, liberdades e garantias, também, mas não apenas, nos termos do art. 18º da CRP. Numa altura em que o ex-agente da CIA-Central Intelligence Agency e da NSA-National Security Agency, Sr. Snowden, revelou que é possível existir, e que existiu em efectivo, acesso a toda a correspondência privada em vários países do mundo, senão mesmo em todos, nomeadamente aquela que é feita por via electrónica e informática, cumpre recordar algumas notas do ponto de vista dos Direitos Fundamentais e do Direito Constitucional. § We are immediately talking about fundamental rights. Rights, freedoms and guarantees, too, but not only, in accordance with art. 18 of CRP. At a time when former CIA agent-Central Intelligence Agency and the NSA-National Security Agency, Mr. Snowden has revealed that it is possible to exist, and has existed in effective, access to all private correspondence in countries around the world, if not in all, including one that is made by electronic and computerized means, it is recalled some notes from the point of view of fundamental rights and constitutional law.

Resistência: Direito Fundamental Constitucional

“Todos têm o direito de resistir a qualquer ordem que ofenda os seus direitos, liberdades e garantias e de repelir pela força qualquer agressão, quando não seja possível recorrer à autoridade pública”. É o que consagra o art. 21º da Constituição da República Portuguesa. Trata-se não apenas dum direito fundamental, mas também dum dever fundamental. § "Everyone has the right to resist any order that offends the rights, freedoms and guarantees and to resist by force any aggression when it is not possible recourse to a public authority." It is what establishes the art. 21 of the Portuguese Constitution. It is not just of a fundamental right, but also as a fundamental duty.

Resistência II: Direito Fundamental Constitucional

Invocava então o art. 21º da CRP. “Todos têm o direito de resistir a qualquer ordem que ofenda os seus direitos, liberdades e garantias e de repelir pela força qualquer agressão, quando não seja possível recorrer à autoridade pública”: art. 21º da Constituição. § Then invoked the art. 21 of the CRP. "Everyone has the right to resist any order that offends the rights, freedoms and guarantees and to resist by force any aggression when it is not possible to use public authority" means art. 21 of the Constitution.

Implementação do modelo de gestão estratégica baseado no "Balenced Scorecard" numa empresa interbancária de Serviços de Angola

RESUMO: Com a constante evolução das novas tecnologias de informação, as organizações têm necessidade de implementar novas ferramentas de gestão de forma a gerar vantagens competitivas, é neste sentido que esta dissertação visa propor a implementação do Modelo de Gestão estratégica baseado no Balanced Scorecard numa Empresa Interbancária de Serviços, com o objectivo de auxiliar na criação de capacidades competitivas, mediante uma avaliação de desempenho mais precisa e estruturada. Esta ferramenta surgiu como alternativa aos sistemas antigos e tradicionais cujo objectivo consistia no controlo das actividades realizadas pelos funcionários, sendo que esta metodologia veio colocar a estratégia no centro das atenções e não somente o controlo, mas só em 1992 é que ela foi reconhecida como um processo revolucionário que alterava todo o processo de gestão padrão nas empresas. Nesta dissertação ira se abordar alguns conceitos desta metodologia, enfatizando, o Mapa de Estratégia, vantagens pela obtenção desta metodologia; e um estudo prático da aplicação do Modelo de Gestão Estratégica na EMIS. Por fim, é de realçar que a grande importância que as empresas têm vindo a atribuir a esta metodologia e a investir nela, garante a sua relevância como tema de pesquisa num futuro próximo. ABSTRACT: With the constant development of new information technologies, organizations need to implement new management tools in order to generate competitive advantages, in this sense this thesis aims to propose the implementation of the Strategic Management Model based on Balanced Scorecard in a Company Interbank services with the aim of assisting in the creation of competitive capabilities through a performance assessment more precise and structured. This tool has emerged as an alternative to traditional legacy systems and was aimed at controlling the activities performed by employees, the methodology that has put the strategy in the spotlight instead of control, but not until 1992 was it recognized as a revolutionary process that changed the entire standard management process in companies. In this dissertation we discuss concepts of this methodology, emphasizing the strategic map for obtaining advantages from it, and a practical application of Strategic Management Model in EMIS. Finally, it is noteworthy that the great importance that companies have been giving to this methodology and the investment they have been doing on it, guarantees its relevance as a research subject in the near future.

Direct Power Control of Matrix Converter Based Unified Power Flow Controllers

This paper presents the Direct Power Control of Three-Phase Matrix Converters (DPC-MC) operating as Unified Power Flow Controllers (UPFC). Since matrix converters allow direct AC/AC power conversion without intermediate energy storage link, the resulting UPFC has reduced volume and cost, together with higher reliability. Theoretical principles of DPC-MC method are established based on an UPFC model, together with a new direct power control approach based on sliding mode control techniques. As a result, active and reactive power can be directly controlled by selection of an appropriate switching state of matrix converter. This new direct power control approach associated to matrix converters technology guarantees decoupled active and reactive power control, zero error tracking, fast response times and timely control actions. Simulation results show good performance of the proposed system.

Comparative evaluation of underlying causes of death processed by the Automated Classification of Medical Entities and the Underlying Cause of Death Selection Systems

INTRODUCTION: The correct identification of the underlying cause of death and its precise assignment to a code from the International Classification of Diseases are important issues to achieve accurate and universally comparable mortality statistics These factors, among other ones, led to the development of computer software programs in order to automatically identify the underlying cause of death. OBJECTIVE: This work was conceived to compare the underlying causes of death processed respectively by the Automated Classification of Medical Entities (ACME) and the "Sistema de Seleção de Causa Básica de Morte" (SCB) programs. MATERIAL AND METHOD: The comparative evaluation of the underlying causes of death processed respectively by ACME and SCB systems was performed using the input data file for the ACME system that included deaths which occurred in the State of S. Paulo from June to December 1993, totalling 129,104 records of the corresponding death certificates. The differences between underlying causes selected by ACME and SCB systems verified in the month of June, when considered as SCB errors, were used to correct and improve SCB processing logic and its decision tables. RESULTS: The processing of the underlying causes of death by the ACME and SCB systems resulted in 3,278 differences, that were analysed and ascribed to lack of answer to dialogue boxes during processing, to deaths due to human immunodeficiency virus [HIV] disease for which there was no specific provision in any of the systems, to coding and/or keying errors and to actual problems. The detailed analysis of these latter disclosed that the majority of the underlying causes of death processed by the SCB system were correct and that different interpretations were given to the mortality coding rules by each system, that some particular problems could not be explained with the available documentation and that a smaller proportion of problems were identified as SCB errors. CONCLUSION: These results, disclosing a very low and insignificant number of actual problems, guarantees the use of the version of the SCB system for the Ninth Revision of the International Classification of Diseases and assures the continuity of the work which is being undertaken for the Tenth Revision version.

A checkpointing-enabled and resource-aware Java Virtual Machine for efficient and robust e-Science applications in grid environments

Object-oriented programming languages presently are the dominant paradigm of application development (e. g., Java,. NET). Lately, increasingly more Java applications have long (or very long) execution times and manipulate large amounts of data/information, gaining relevance in fields related with e-Science (with Grid and Cloud computing). Significant examples include Chemistry, Computational Biology and Bio-informatics, with many available Java-based APIs (e. g., Neobio). Often, when the execution of such an application is terminated abruptly because of a failure (regardless of the cause being a hardware of software fault, lack of available resources, etc.), all of its work already performed is simply lost, and when the application is later re-initiated, it has to restart all its work from scratch, wasting resources and time, while also being prone to another failure and may delay its completion with no deadline guarantees. Our proposed solution to address these issues is through incorporating mechanisms for checkpointing and migration in a JVM. These make applications more robust and flexible by being able to move to other nodes, without any intervention from the programmer. This article provides a solution to Java applications with long execution times, by extending a JVM (Jikes research virtual machine) with such mechanisms. Copyright (C) 2011 John Wiley & Sons, Ltd.