Quantization maps, algebra representation and non-commutative Fourier transform for Lie groups

The phase space given by the cotangent bundle of a Lie group appears in the context of several models for physical systems. A representation for the quantum system in terms of non-commutative functions on the (dual) Lie algebra, and a generalized notion of (non-commutative) Fourier transform, different from standard harmonic analysis, has been recently developed, and found several applications, especially in the quantum gravity literature. We show that this algebra representation can be defined on the sole basis of a quantization map of the classical Poisson algebra, and identify the conditions for its existence. In particular, the corresponding non-commutative star-product carried by this representation is obtained directly from the quantization map via deformation quantization. We then clarify under which conditions a unitary intertwiner between such algebra representation and the usual group representation can be constructed giving rise to the non-commutative plane waves and consequently, the non-commutative Fourier transform. The compact groups U(1) and SU(2) are considered for different choices of quantization maps, such as the symmetric and the Duflo map, and we exhibit the corresponding star-products, algebra representations and non-commutative plane waves.Comment: 36 pages; matches published version plus minor correction

Security Policy Consistency

With the advent of wide security platforms able to express simultaneously all the policies comprising an organization's global security policy, the problem of inconsistencies within security policies become harder and more relevant. We have defined a tool based on the CHR language which is able to detect several types of inconsistencies within and between security policies and other specifications, namely workflow specifications. Although the problem of security conflicts has been addressed by several authors, to our knowledge none has addressed the general problem of security inconsistencies, on its several definitions and target specifications.Comment: To appear in the first CL2000 workshop on Rule-Based Constraint Reasoning and Programmin

Development and test of resistive superconducting fault current limiter; acting time and its recovery conditions

Resistive-type of superconducting fault current limiters (RSFCL) have been developed for medium voltage class aiming to operate at 1 MVA power capacity and short time recovery (< 2 s). A RSFCL in form of superconducting modular device was designed and constructed using 50 m-length of YBCO coated conductor tapes for operation under 1 kV / 1 kA and acting time of 0.1 s. In order to increase the acting time the RSFCL was combined with an air-core reactor in parallel to increase the fault limiting time up to 1 s. The tests determined the electrical and thermal characteristics of the combined resistive/ inductive protection unit. The combined fault current limiter reached a limiting current of 583 A, corresponding to a limiting factor of 3.3 times within an acting time of up to 1 s

Effects of sulfur-based hemostatic agents and gingival retraction cords handled with latex gloves on the polymerization of polyvinyl siloxane impression materials

OBJECTIVES: This study investigated the possible interactions between three addition silicone materials (Express®, Aquasil Ultra® and Adsil®), three hemostatic agents (ferric sulfate, StatGel FS®; aluminum sulfate, GelCord®; and aluminum chloride, Hemostop®) and gingival retraction cords previously handled with latex gloves to determine whether direct contact with medicaments or indirect contamination by latex in conditions similar to those found in clinical practice inhibit or affect the setting of the impression materials. MATERIAL AND METHODS: A portable device for the simultaneous test of several specimens was specifically developed for this study. Polymerization inhibition was analyzed by examination of the impressions and the molded surface. Ten trials were performed for each addition silicone material used in the study, at a total of 240 study samples. RESULTS: All the samples tested (N=240) were nonreactive regardless of the type of combination used. CONCLUSIONS: Aluminum sulfate, ferric sulfate and aluminum chloride hemostatic solutions did not show any inhibitory potential on the addition silicone samples under study, and there were no changes in polymerization as a result of contact between addition silicone and retraction cords handled with latex gloves

Near Real Time Steering: The Organizational Cockpit at the Strategic Level

AbstractIn an increasingly competitive environment, a more efficient management of resources is of utmost importance. However, despite the recognized importance given to the organization's strategy, many still remain focused on the usual budgeting cycle to financially control their actions. This short-term and incremental tactical behavior does not allow decisors to focus on what lies beyond the horizon. The Organizational Cockpit concept emerges as a strategic management system, in near real time, as an attempt to explain and communicate the organization's strategy at all levels. It fosters strategic performance monitoring and measuring by providing information on how the “flight” is doing, thus creating the conditions to allow strategic navigation, permitting to assess performance and, at the same time, information about actions taken, the resources used and their result. This concept can also be used to assess the organization's performance within the Portuguese Integrated Management System and Performance Evaluation in Public Administration

EVALUATION OF VARIOUS WAVE ENERGY CONVERTERS IN THE BAY OF CÁDIZ

The Andalusian Agency of Energy has identified three areas of major interest for harnessing wave energy, in their plan of “Marine Energy and Energy Resources of Andalusia”. One of these areas is located on the Atlantic coast, the bay of Cádiz. Considering this initial interest, the objective of this work is to carry out an evaluation of the performance provided by various technologies of wave energy conversion in the bay of Cádiz. The data for the wave climate in the target area are obtained from the Spanish Agency Puertos del Estado. Diagrams for bivariate distributions of the sea states occurrences, defined by the significant wave height and the energy period, are shown. On this basis, the output of nine different technologies for the conversion of wave energy is assessed in the reference locations in the bay of Cádiz. According to the results obtained, it can be said that the bay of Cádiz is a suitable place for wave energy extraction

OVERVIEW AND PROSPECTS FOR DEVELOPMENT OF WAVE AND OFFSHORE WIND ENERGY

An overview of the present state of development of offshore renewable wave and wind energy is presented and future prospects are discussed. The information on some of the current wave energy systems worldwide are given as indicative of the present state of affairs. The main working principles of wave energy systems are described and the differences in terms of working principle, conversion chain, location and power take-off systems are highlighted. Some of the technology challenges are identified and the prospects of utilization of the various wave energy concepts are discussed comparing the characteristics of the devices in particular their power output. The evolution of the concepts of wind turbines with time and the main types of offshore wind turbine concepts are presented, from the shallow water fixed ones to the floating ones. The development of various numerical codes for the dynamic analysis of offshore wind turbines and the studies carried out based on the codes for hydrodynamic, aerodynamic, structural and response due to control system are presented. The present status of wind energy compared to wave energy and the role of naval architects and ocean engineers for the design and analysis of wave energy device and offshore wind turbine technology are presented and discussed

Fazer escolhas ainda é possível? : como a intensidade das mudanças no domínio e uso da terra podem influenciar nos compromissos determinados pelo Brasil sobre mudanças climáticas

Esta dissertação visa aferir se as percepções acerca do aumento da intensidade das mudanças no uso da terra no Brasil podem ser confirmadas a partir de análises em municípios selecionados e as possíveis consequências para os compromissos assumidos pelo país no chamado "Acordo de Paris" sobre mudanças climáticas, em 2015. A conversão da natureza em fator de produção não é um fato novo na história da humanidade. A discussão proposta na dissertação trata de identificar os vetores do atual movimento e da expansão da velocidade no Brasil, a partir de três referências bibliográficas. Em primeiro lugar, a não observância dos efeitos sobre o conjunto da sociedade sobre a ação de indivíduos que transformam parte da natureza em sua propriedade (formal ou informal), em especial o aumento das emissões de gases de efeito estufa e perda da biodiversidade. Em segundo lugar, a razão de tal movimento se dar na atual conjuntura pela associação de um interesse estratégico do Brasil em ampliar as exportações de commodities agrícolas, com uma nova conformação de ganhos a partir da combinação entre os ganhos em escala e modelo produtivo com os ganhos oriundos da propriedade da terra, como monopólio constituído e direcionado para tal fim. Em terceiro lugar, entender que tais ganhos se dão em áreas em que o custo da terra e mão-de-obra é mais barato, e pode garantir ganhos em maior velocidade para acumulação do capital. A partir de tais premissas teóricas, foram adotados procedimentos via metodologia quantitativa para identificar municípios a serem analisados e, a partir da seleção dos locais de análises, foram organizadas bases de dados que permitiram aferir elementos de estrutura e dinâmica de domínio e uso da terra, assim como projetar os movimentos futuros, tendo como ponto de chegada o ano de 2030, ano limite do acordo climático global. O exercício quantitativo em três localidades (municípios de Bom Jesus/PI, Machadinho D'Oeste/RO e Dom Pedrito/RS), inseridos em três biomas diferentes (Amazônia, Cerrado e Pampa), trouxe subsídios para sustentar a posição sobre a intensidade das mudanças e as possíveis repercussões não apenas sobre as metas de mitigação climática do Brasil, como também podem desenhar um processo de homogeneização produtiva, fragilização das formas de ocupação da terra por populações tradicionais e agricultores familiares por efeitos ocasionados pela entrada do capital combinando ganhos de escala e produção com ganhos de renda sobre a propriedade. A partir do cotejamento entre os elementos quantitativos e o referencial bibliográfico, procurou-se apontar cenários de cumprimento das metas sem perder de perspectiva a manutenção de um quadro de coexistência entre as diferentes formas de ocupação, vida e produção no rural brasileiro, assim como a necessidade da mediação sobre a aplicação de responsabilidades comuns porém diferenciadas de acordo com as capacidades com relação à preservação ambiental, visto que se trata de um desafio do presente que compromete o futuro, na qual o Brasil já foi uma referência global em mostrar saídas adequadas para o desenvolvimento rural sustentávelThis dissertation aims to assess whether perceptions about the increased intensity of land use changes in Brazil can be confirmed by measurements in selected municipalities and the possible consequences for the country's commitments in the so-called "Paris Agreement" on changes climate change in 2015. The conversion of nature into a factor of production is not a new fact in the history of mankind. The discussion proposed in the dissertation tries to identify the possible causes of the current movement and speed expansion in Brazil, based on three bibliographical references. Firstly, the non-observance of the effects on society as a whole of the action of individuals who transform part of nature into their property (formal or informal), especially the increase of greenhouse gas emissions and loss of biodiversity. Secondly, the reason for such a move is in the current conjuncture by the association of a strategic interest of Brazil in expanding the exports of agricultural commodities, with a new conformation of gains from the combination between the gains in scale and productive model with the gains derived from land ownership, as a monopoly constituted and directed to that end. Third, to understand that such gains occur in areas where the cost of land and labor are cheaper, and can guarantee faster gains for capital accumulation. Based on such theoretical premises, procedures were adopted through a quantitative methodology to identify municipalities to be analyzed and, based on the selection of the analysis sites, databases were organized that allowed to assess elements of structure and dynamics of domain and land use, as well as to design the future movements, having as destination point the year 2030, the limit year of the global climate agreement. The quantitative exercise in three localities, Bom Jesus / PI municipalities, Mahcadinho D'Oeste / RO and Dom Pedrito / Rs, inserted in three different biomes - Amazonia, Cerrado and Pampa, provided subsidies to support the position on the intensity of the changes and the possible repercussions not only on Brazil's climate mitigation goals, but also the design of a process of productive homogenization, the weakening of forms of land occupation by traditional populations and family farmers by effects of capital inflows, combining gains in scale and production with income gains on the property. The comparison of the quantitative elements with the bibliographical reference was made to identify scenarios of compliance with the goals without losing sight of the need to maintain a framework of coexistence between the different forms of occupation, life and production in the Brazilian countryside, as well as The need for mediation on the application of common but differentiated responsibilities according to the capacities related to environmental preservation, since it is a challenge of the present that compromises the future, in which Brazil has already been a global reference in showing suitable outputs for sustainable rural development

Methodology to Calculate the Costs of a Floating Offshore Renewable Energy Farm

This paper establishes a general methodology to calculate the life-cycle cost of floating offshore renewable energy devices, applying it to wave energy and wind energy devices. It is accounts for the contributions of the six main phases of their life-cycle: concept definition, design and development, manufacturing, installation, exploitation and dismantling, the costs of which have been defined. Moreover, the energy produced is also taken into account to calculate the Levelized Cost of Energy of a floating offshore renewable energy farm. The methodology proposed has been applied to two renewable energy devices: a floating offshore wave energy device and a floating offshore wind energy device. Two locations have been considered: Aguçadoura and São Pedro de Moel, both in Portugal. Results indicate that the most important cost in terms of the life-cycle of a floating offshore renewable energy farm is the exploitation cost, followed by the manufacturing and the installation cost. In addition, the best area in terms of costs is the same independently of the type of floating offshore renewable energy considered: Aguçadoura. However, the results in terms of Levelized Cost of Energy are different: Aguçadoura is better when considering wave energy technology and the São Pedro de Moel region is the best option when considering floating wind energy technology. The method proposed aims to give a direct approach to calculate the main life-cycle cost of a floating offshore renewable energy farm. It helps to assess its feasibility and evaluating the relevant characteristics that influence it the most

The m-objects: A Small Library for Musical Rhythm Generation and Musical Tempo Control from Dance Movement in Real Time

ABSTRACT This software library allows a dancer to control the tempo of an electronically-generated music score, and/or to generate musical rhythmic structures from bodily movement in real time in interactive dance performance. The movement data is gathered non-invasively, using a fixed video camera placed outside the area in which the dancer is moving. This library is implemented as a set of external objects, called the m-objects, for the modular programming environment Max/MSP [1] using an external object or library that performs framedifferencing analysis of a video stream in real time. This library should also be easily ported to other visual programming environments that perform video analysis in real time such as Isadora [2] or EyesWeb [3]. During the performance of a piece utilizing this software, the musician can give or take away the control over rhythm generation and/or musical tempo from the dancer, and substantially alter the musical content of a piece during performance. In this paper I describe each object comprising the library. In the demonstration session I will show the basic connections that have to be performed among the objects in order to generate musical rhythm and to control musical tempo from dance movement