Entre a potência e o ato: atitudes políticas e percepções de mobilização em Natal e Porto Alegre

The recent democratic process in Brazil made it as element for its consolidation the idea of participation. It requires a state model that included on its agenda democratic society participation in decision-making process, and a society that has as a principle based participatory civic consciousness. Therefore, this study aims to analyze the level of political participation in two Brazilian state capitals , Natal and Porto Alegre. Data were obtained through quantitative data from the application of 384 questionnaires in both capitals. We chose some variables that will form the basis for our study; Duties of a good citizen, a good citizen rights, Confidence, Index of socialization, exposure to media, degree of interest in politics; Mobilization; Associations. Already qualitative research sought to address the political, cultural and institutional of the two municipalities

Anagramas do corpo, processos de repetição e representação da condição humana: um diálogo entre Hans Bellmer e Pina Bausch

La relation entre l`ignorance, l`apprentissage et de la création composent un décor provocant pour nous faire réfléchir sur l`éducation et la science. Pour éclaircir cette réflexion, nous démarrons sur les propositions de Ilya Prigogine (1986), pour qui l`art est une métaphore qui représente la science au XXe siècle, les idées d`Edgar Morin (2004), en soulignant la contribution fondamentale de l`art à l`état humain, et Maurice Merleau- Ponty (1980), qui crédite à l`art la possibilité d`un nouveau regard sur le monde, un regard sensible, esthétique. Ayant par référence la présence de ces arguments, nous réaffirmons la thèse de que l`art peut présenter des métaphores pour considérer la science, l`éducation et la condition humaine sur des bases complexes et transdisciplinaires. Nous nous concentrons sur des catégories particulières de la déformation et de la répétition. La première est considérée comme un désordre nécessaire au corps, à la science et à l`éducation, des lieux de métamorphose constante, d`après les principes de la complexité. La seconde est appréciée comme un opérateur sans lequel la variation, l`écart, le nouveau et l`invention ne peuvent pas émerger. Nos métaphores ressortent des travaux esthétiques de deux artistes de renom: Pina Bausch et Hans Bellmer, les délinquants qui certainement se rebellent contre la trivialité dans l`art et la vie. Ils exploitent des rêves, des démonstrations affectueuses impertinentes, esthétiques inaugurales, antiparadigmatiques et audacieuses. En un mot, ils incarnent ce qu`on appelle une pensée complexe. Nous comprenons que les deux artistes déclenchent des dispositifs qui dialoguent avec le manifeste de Merleau-Ponty lorsque l`on cherche dans l "aisthesis" la possibilité d`une production naturelle qui est en elle-même, créative. Ayant comme horizon cette puissance créatrice nous concentrons notre regard sur les anagrammes du corps proposés par Bellmer et sur la répétition exprimée par Pina Bausch. La déformation et la répétition sont des étapes embryonnaires de la création

Ensinamentos do barro : conversas com Francisco Brennand

El concepto de paisaje, caracterizado por la colaboración de distintos dominios cognitivos, atraviesa campos disciplinarios y formas de estructurar la producción de conocimiento a través del Arte. Para Cauquelin (2007), la representación occidental de la mirada paisajística es siempre una mirada estética que indica una conexión inseparable de la forma percibida con la forma sentida. Esa mirada estética recuerda al hombre su condición bioantropológica. En ese sentido, entiendo que un paisaje se presenta como un medio donde el humano puede ejercer su singularidad poética, transitando, así, por campos o capas de conocimientos diversos capaces de ampliar su visión rearticuladora del mundo. Motivada por esa percepción, elegí como campo empírico el Museo Taller de Cerámica Francisco Brennand, en Recife, Pernambuco. Reconstruido por el artista, el lugar, injertado de recuerdos de la infancia, pasa a abrigar, a partir de 1971, el conjunto de su obra de cerámica y pintórica. La frecuentación del artista transformó la estrategia metodológica de la entrevista en sabias y agradables conversaciones, que me proporcionaron la experiencia de otras posibilidades de enfoque durante la realización de la investigación. El objetivo de la investigación es ampliar las relaciones conceptuales entre paisaje y representación, en el sentido de privilegiar a la imaginación creativa. Tomé al paisaje como una metáfora y como un operador cognitivo, imprescindibles para el aprendizaje de la condición humana. Compartir estrategias a la vez complementares y recíprocas es lo que proponen Almeida (2009) y Morin con vistas a volver a enlazar la cultura científica y la cultura humanística, en un metodo mestizo y bricoleur que es necesaria para una reforma del pensamiento que lleva en cuenta el ensueño de la materia propuesto por Bachelard (2008). El arte se convierte, así, en un operador cognitivo capaz de promover cambios en el contexto de la educación, en dirección a una pedagogía con base compleja, como propone Pereira (1999)

Efeitos da laserterapia de baixa potência sobre a fadiga do músculo quadríceps de indivíduos jovens

The objective of this study was to evaluate the effect of low laser power on the performance of anaerobic endurance of the quadriceps muscle in young subjects. Low-level laser therapy (LLLT) appears to decrease some indices of muscle fatigue. Most of these effects may be due to the influence of the laser on the muscles predominantly aerobic. Animal studies and clinical trials have already shown that the laser can improve the efficiency of mitochondrial metabolism for the resynthesis of adenosine triphosphate and thus slow down - or minimize, the deleterious effects of muscle fatigue. This research was characterized as an experimental study of the controlled clinical trial, randomized, blinded, attended by 93 volunteers, military, with ages between 18 and 19 years. The subjects were randomly allocated into three groups: Control (G1), Placebo (G2) and Laser (G3). All volunteers underwent an anthropometric assessment and a protocol Fatigue. This protocol was applied to an initial assessment (AV-1) for the collection of baseline data, and a final evaluation (AV-2). As the study variables, we used the blood lactate concentrations and indices of muscle power, as average power and peak velocity. The fatigue protocol consisted of a test of speed with twenty repetitions, performed on an exercise machine leg press 45º . In conclusion, it was found that, in this study, LLLT caused a significant increase in the Average of the Averages Powers, phase eccentric exercise in leg press 45º performed by young individuals

Efeitos agudos da aplicação do laser de baixa potência sobre o desempenho neuromuscular do sóleo em sujeitos saudáveis

A laserterapia de baixa potência (LBP) tem demonstrado recentemente ser capaz de aumentar a resistência à fadiga, bem como potencializar o desempenho neuromuscular através de seus efeitos metabólicos e fotoquímicos. Estudos anteriores mostraram que o LBP reduziu o estresse oxidativo do exercício, promovendo um retardo da fadiga muscular e minimizando seus efeitos deletérios. O objetivo desse estudo foi avaliar se a aplicação do LBP antes de um protocolo de fadiga teria efeito sobre o desempenho neuromuscular nas variáveis eletromiográficas e dinamométricas do músculo sóleo em sujeitos saudáveis. Esta pesquisa caracterizou-se como um estudo experimental do tipo ensaio clínico controlado, randomizado e cego, no qual participaram 60 voluntários de ambos os sexos, com faixa etária entre 18 e 28 anos e fisicamente ativos, segundo o questionário internacional para a prática de atividade física (IPAQ). Os sujeitos foram alocados randomicamente em três grupos: Controle (G1), Placebo (G2) e Laser (G3) e todos os voluntários foram submetidos a uma avaliação inicial (AV-1), um Protocolo de Fadiga e uma avaliação final (AV-2), compostas por contrações isocinéticas para flexão plantar a uma velocidade de 90°/s. Os resultados encontrados nesse estudo mostraram que não houve diferença estatística entre os três grupos da pesquisa nas variáveis eletromiográficas de RMS e Frequência Mediana, contudo, em relação à dinamometria, o grupo que recebeu a aplicação do Laser obteve um índice de fadiga significativamente menor (p=0,04) quando comparado aos grupos Controle e Placebo. Além disso, a aplicação do laser pré-exercício também resultou em um aumento nas variáveis de desempenho potência e trabalho. Com isso, pode-se concluir que o LBP foi capaz de melhorar o desempenho do sóleo em sujeitos saudáveis, justificado pelo aumento da resistência à fadiga

Controle Adaptativo Robusto para Filtros Ativos de Potência Paralelo

Conventional control strategies used in shunt active power filters (SAPF) employs real-time instantaneous harmonic detection schemes which is usually implements with digital filters. This increase the number of current sensors on the filter structure which results in high costs. Furthermore, these detection schemes introduce time delays which can deteriorate the harmonic compensation performance. Differently from the conventional control schemes, this paper proposes a non-standard control strategy which indirectly regulates the phase currents of the power mains. The reference currents of system are generated by the dc-link voltage controller and is based on the active power balance of SAPF system. The reference currents are aligned to the phase angle of the power mains voltage vector which is obtained by using a dq phase locked loop (PLL) system. The current control strategy is implemented by an adaptive pole placement control strategy integrated to a variable structure control scheme (VS-APPC). In the VS-APPC, the internal model principle (IMP) of reference currents is used for achieving the zero steady state tracking error of the power system currents. This forces the phase current of the system mains to be sinusoidal with low harmonics content. Moreover, the current controllers are implemented on the stationary reference frame to avoid transformations to the mains voltage vector reference coordinates. This proposed current control strategy enhance the performance of SAPF with fast transient response and robustness to parametric uncertainties. Experimental results are showing for determining the effectiveness of SAPF proposed control system

Desenvolvimento de monopolos quase-espirais para aplicações em sistemas UWB

This work is the analysis of a structure of the microstrip antenna designed for application in ultra wide band systems (Ultra Wideband - UWB). This is a prospective analytical study where they tested the changes in the geometry of the antenna, observing their suitability to the proposed objectives. It is known that the UWB antenna must operate in a range of at least 500 MHz, and answer a fractional bandwidth greater than or equal to 25%. It is also desirable that the antenna meets the specifications of track determined by FCC - Federal Communication Commission, which regulates the system in 2002 designating the UWB bandwidth of 7.5 GHz, a range that varies from 3.1 GHz to 10, 6 GHz. by setting the maximum power spectral density of operation in -41.3 dB / MHz, and defining the fractional bandwidth by 20%. The study starts of a structure of geometry in the form of stylized @, which evolves through changes in its form, in simulated commercial software CST MICROWAVE STUDIO, version 5.3.1, and then tested using the ANSOFT HFSS, version 9. These variations, based on observations of publications available from literature referring to the microstrip monopole planar antennas. As a result it is proposed an antenna, called Monopole Antenna Planar Spiral Almost Rectangular for applications in UWB systems - AMQEUWB, which presents simulated and measured results satisfactory, consistent with the objectives of the study. Some proposals for future work are mentioned

Modelagem em SystemC-AMS de uma plataforma compatível com o sistema de coleta de dados brasileiro

This work presents simulation results of an identification platform compatible with the INPE Brazilian Data Collection System, modeled with SystemC-AMS. SystemC-AMS that is a library of C++ classes dedicated to the simulation of heterogeneous systems, offering a powerful resource to describe models in digital, analog and RF domains, as well as mechanical and optic. The designed model was divided in four parts. The first block takes into account the satellite s orbit, necessary to correctly model the propagation channel, including Doppler effect, attenuation and thermal noise. The identification block detects the satellite presence. It is composed by low noise amplifier, band pass filter, power detector and logic comparator. The controller block is responsible for enabling the RF transmitter when the presence of the satellite is detected. The controller was modeled as a Petri net, due to the asynchronous nature of the system. The fourth block is the RF transmitter unit, which performs the modulation of the information in BPSK ±60o. This block is composed by oscillator, mixer, adder and amplifier. The whole system was simulated simultaneously. The results are being used to specify system components and to elaborate testbenchs for design verification

Uma fonte chaveada de 50kW com correção de fator de potência para alimentação de uma tocha de plasma Indutiva utilizando técnicas de controle digital

This work deals with the development of an experimental study on a power supply of high frequency that provides the toch plasmica to be implemented in PLASPETRO project, which consists of two static converters developed by using Insulated Gate Bipolar Transistor (IGBT). The drivers used to control these keys are triggered by Digital Signal Processor (DSP) through optical fibers to reduce problems with electromagnetic interference (EMI). The first stage consists of a pre-regulator in the form of an AC to DC converter with three-phase boost power factor correction which is the main theme of this work, while the second is the source of high frequency itself. A series-resonant inverter consists of four (4) cell inverters operating in a frequency around 115 kHz each one in soft switching mode, alternating itself to supply the load (plasma torch) an alternating current with a frequency of 450 kHz. The first stage has the function of providing the series-resonant inverter a DC voltage, with the value controlled from the power supply provided by the electrical system of the utility, and correct the power factor of the system as a whole. This level of DC bus voltage at the output of the first stage will be used to control the power transferred by the inverter to the load, and it may vary from 550 VDC to a maximum of 800 VDC. To control the voltage level of DC bus driver used a proportional integral (PI) controller and to achieve the unity power factor it was used two other proportional integral currents controllers. Computational simulations were performed to assist in sizing and forecasting performance. All the control and communications needed to stage supervisory were implemented on a DSP

Técnica de controle adaptativo robusto aplicada a filtros ativos de potência e paralelo

The Methods for compensation of harmonic currents and voltages have been widely used since these methods allow to reduce to acceptable levels the harmonic distortion in the voltages or currents in a power system, and also compensate reactive. The reduction of harmonics and reactive contributes to the reduction of losses in transmission lines and electrical machinery, increasing the power factor, reduce the occurrence of overvoltage and overcurrent. The active power filter is the most efficient method for compensation of harmonic currents and voltages. The active power filter is necessary to use current and voltage controllers loop. Conventionally, the current and voltage control loop of active filter has been done by proportional controllers integrative. This work, investigated the use of a robust adaptive control technique on the shunt active power filter current and voltage control loop to increase robustness and improve the performance of active filter to compensate for harmonics. The proposed control scheme is based on a combination of techniques for adaptive control pole placement and variable structure. The advantages of the proposed method over conventional ones are: lower total harmonic distortion, more flexibility, adaptability and robustness to the system. Moreover, the proposed control scheme improves the performance and improves the transient of active filter. The validation of the proposed technique was verified initially by a simulation program implemented in C++ language and then experimental results were obtained using a prototype three-phase active filter of 1 kVA

Implementação experimental de filtro ativo paralelo de potência com aplicação a gerador de indução trifásico

This work describes the experimental implementation of a shunt active power filter applied to a three-phase induction generator. The control strategy of active filter turned to the excitation control of the machine and to decrease the harmonics in the generator output current. Involved the implementation of a digital PWM switching, and was made a comparison of two techniques for obtaining the reference currents. The first technique is based on the synchronous dq reference method and the second on the theory of instantaneous power. The comparison is performed via simulation and experimental results. To obtain the experimental results, was mounted a bench trial and the control and communications needed were implemented using DSP - MS320F2812. The simulation results and experimental data proved the efficiency of the filter to apply, highlighting the technique of instantaneous power

Desenvolvimento de Modelos no Programa DigSILENT PowerFactoryTM para o Estudo de Estabilidade Transitória em Sistemas Elétricos de Potência com Aerogerador

This work presents a description of models development at DigSILENT PowerFactoryT M program for the transient stability study in power systems with wind turbine. The main goal is to make available means to use a dynamic simulation program in power systems, widely published, and utilize it as a tool that helps in programs results evaluations used for this intent. The process of simulations and analyses results starts after the models setting description phase. The results obtained by the DigSILENT PowerFactoryT M and ATP, program chosen to the validation also international recognized, are compared during this phase. The main tools and guide lines of PowerFactoryT M program use are presented here, directing these elements to the solution of the approached problem. For the simulation it is used a real system which it will be connected a wind farm. Two different technologies of wind turbines were implemented: doublyfed induction generator with frequency converter, connecting the rotor to the stator and to the grid, and synchronous wind generator with frequency converter, interconnecting the generator to the grid. Besides presenting the basic conceptions of dynamic simulation, it is described the implemented control strategies and models of turbine and converters. The stability of the wind turbine interconnected to grid is analyzed in many operational conditions, resultant of diverse kinds of disturbances

Desenvolvimento de modelos no programa digSILENT powerfactoryTM para o estudo de estabilidade transitória em sistemas elétricos de potência com aerogerador

This work presents a description of models development at DigSILENT PowerFactoryTM program for the transient stability study in power systems with wind turbine. The main goal is to make available means to use a dynamic simulation program in power systems, widely published, and utilize it as a tool that helps in programs results evaluations used for this intent. The process of simulations and analyses results starts after the models setting description phase. The results obtained by the DigSILENT PowerFactoryTM and ATP, program chosen to the validation also international recognized, are compared during this phase. The main tools and guide lines of PowerFactoryTM program use are presented here, directing these elements to the solution of the approached problem. For the simulation it is used a real system which it will be connected a wind farm. Two different technologies of wind turbines were implemented: doubly-fed induction generator with frequency converter, connecting the rotor to the stator and to the grid, and synchronous wind generator with frequency converter, interconnecting the generator to the grid. Besides presenting the basic conceptions of dynamic simulation, it is described the implemented control strategies and models of turbine and converters. The stability of the wind turbine interconnected to grid is analyzed in many operational conditions, resultant of diverse kinds of disturbances

Estabilizador de sistema de potência para máquinas síncronas de polos salientes utilizando a transformada Wavelet

The power system stabilizers are used to suppress low-frequency electromechanical oscillations and improve the synchronous generator stability limits. This master thesis proposes a wavelet-based power system stabilizer, composed of a new methodology for extraction and compensation of electromechanical oscillations in electrical power systems based on the scaling coefficient energy of the maximal overlap discrete wavelet transform in order to reduce the effects of delay and attenuation of conventional power system stabilizers. Moreover, the wavelet coefficient energy is used for electric oscillation detection and triggering the power system stabilizer only in fault situations. The performance of the proposed power system stabilizer was assessed with experimental results and comparison with the conventional power system stabilizer. Furthermore, the effects of the mother wavelet were also evaluated in this work

Uso de funções de alívio para estimar o efeito de chaveamentos corretivos na eliminação de congestionamentos em sistemas de potência

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior