The role of magnetic reconnection on jet/accretion disk systems

Context. It was proposed earlier that the relativistic ejections observed in microquasars could be produced by violent magnetic reconnection episodes at the inner disk coronal region (de Gouveia Dal Pino & Lazarian 2005). Aims. Here we revisit this model, which employs a standard accretion disk description and fast magnetic reconnection theory, and discuss the role of magnetic reconnection and associated heating and particle acceleration in different jet/disk accretion systems, namely young stellar objects (YSOs), microquasars, and active galactic nuclei (AGNs). Methods. In microquasars and AGNs, violent reconnection episodes between the magnetic field lines of the inner disk region and those that are anchored in the black hole are able to heat the coronal/disk gas and accelerate the plasma to relativistic velocities through a diffusive first-order Fermi-like process within the reconnection site that will produce intermittent relativistic ejections or plasmons. Results. The resulting power-law electron distribution is compatible with the synchrotron radio spectrum observed during the outbursts of these sources. A diagram of the magnetic energy rate released by violent reconnection as a function of the black hole (BH) mass spanning 10(9) orders of magnitude shows that the magnetic reconnection power is more than sufficient to explain the observed radio luminosities of the outbursts from microquasars to low luminous AGNs. In addition, the magnetic reconnection events cause the heating of the coronal gas, which can be conducted back to the disk to enhance its thermal soft X-ray emission as observed during outbursts in microquasars. The decay of the hard X-ray emission right after a radio flare could also be explained in this model due to the escape of relativistic electrons with the evolving jet outburst. In the case of YSOs a similar magnetic configuration can be reached that could possibly produce observed X-ray flares in some sources and provide the heating at the jet launching base, but only if violent magnetic reconnection events occur with episodic, very short-duration accretion rates which are similar to 100-1000 times larger than the typical average accretion rates expected for more evolved (T Tauri) YSOs.

The game inside the school: a representation of 5(th) graders physical education classes

Since the beginning of Physical Education entrance in the brazilin public schools, the game has been frequently used as content, and in the course of time that practice seems to be intensified. In spite of many approaches of different purposes to justify its pedagogic usefulness, the game has been used as an indiscriminate way due to the fascination that it provides to the students. The present study searches for a description and analysis of children`s (10-12 years old) attitudes behaviors in games, on Physical Education classes, inside a public school. The study was accomplished with the researcher also attending as a teacher (action research). For the accomplishment of the study 55 children were filmed in four different games, of different kinds (exposed, transformed, and spontaneous). The classes` description and analysis were focused in the attitude axis and it was defined four topics for the discussion: Conflicts, Respect of rules, Expressiveness, and Competitiveness. The relationship between the individual with the game and its culture were pointed as the main characteristics in the configuration of the ludicrous activity atmosphere. It was also possible to observe specific situations of this relationship, once the games were limited to the social games (Piaget category), in a school atmosphere where children have students roles. Due to the obtained results, the study proposes a reflexive practice in which the students notice their own attitudes and try to adapt the game to their needs and not he other way around. In this perspective, the teacher has an important mediator roll, once he will be responsible to point out the students` difficulties and promote discussions in favor to provide teamwork.

Brazilian flavonoid database: Application of quality evaluation system

Much information on flavonoid content of Brazilian foods has already been obtained; however, this information is spread in scientific publications and non-published data. The objectives of this work were to compile and evaluate the quality of national flavonoid data according to the United States Department of Agriculture`s Data Quality Evaluation System (USDA-DQES) with few modifications, for future dissemination in the TBCA-USP (Brazilian Food Composition Database). For the compilation, the most abundant compounds in the flavonoid subclasses were considered (flavonols, flavones, isoflavones, flavanones, flavan-3-ols, and anthocyanidins) and the analysis of the compounds by HPLC was adopted as criteria for data inclusion. The evaluation system considers five categories, and the maximum score assigned to each category is 20. For each data, a confidence code (CC) was attributed (A, B, C and D), indicating the quality and reliability of the information. Flavonoid data (773) present in 197 Brazilian foods were evaluated. The CC ""C"" (as average) was attributed to 99% of the data and ""B"" (above average) to 1%. The main categories assigned low average scores were: number of samples; sampling plan and analytical quality control (average scores 2, 5 and 4, respectively). The analytical method category received an average score of 9. The category assigned the highest score was the sample handling (20 average). These results show that researchers need to be conscious about the importance of the number and plan of evaluated samples and the complete description and documentation of all the processes of methodology execution and analytical quality control. (C) 2010 Elsevier Inc. All rights reserved.

High-frequency acousto-electric single-photon source

We propose a single optical photon source for quantum cryptography based on the acoustoelectric effect. Surface acoustic waves (SAWs) propagating through a quasi-one-dimensional channel have been shown to produce packets of electrons that reside in the SAW minima and travel at the velocity of sound. In our scheme, the electron packets are injected into a p-type region, resulting in photon emission. Since the number of electrons in each packet can be controlled down to a single electron, a stream of single- (or N-) photon states, with a creation time strongly correlated with the driving acoustic field, should be generated.

KuhlmanniodendronFiaschi & Groppo, a new eastern Brazilian genus of Achariaceae sensu lato segregated from Carpotroche Endl. (formerly included in Flacourtiaceae)

Kuhlmanniodendron Fiaschi & Groppo, a new genus of the tribe Lindackerieae (Achariaceae sensu lato) is created to accommodate Carpotroche apterocarpa Kuhlm, a species previously described based on incomplete floriferous and fruiting material from the rainforests of Espirito Santo state, eastern Brazil. The genus is defined by a unique set of character states, including leaves with Clusia-like venation and scaly trichomes, flowers with glabrous stamen filaments and three free styles, and indehiscent fruits with a smooth surface (sometimes with vertical ribs when dried). A description and illustration are provided, with comments on geographical distribution, phenology and generic relationships, and an emended key to neotropical genera of Lindackerieae. (c) 2008 The Linnean Society of London.

Segmenting the market of West Australian senior tourists using an artificial neural network

Measuring perceptions of customers can be a major problem for marketers of tourism and travel services. Much of the problem is to determine which attributes carry most weight in the purchasing decision. Older travellers weigh many travel features before making their travel decisions. This paper presents a descriptive analysis of neural network methodology and provides a research technique that assesses the weighting of different attributes and uses an unsupervised neural network model to describe a consumer-product relationship. The development of this rich class of models was inspired by the neural architecture of the human brain. These models mathematically emulate the neurophysical structure and decision making of the human brain, and, from a statistical perspective, are closely related to generalised linear models. Artificial neural networks or neural networks are, however, nonlinear and do not require the same restrictive assumptions about the relationship between the independent variables and dependent variables. Using neural networks is one way to determine what trade-offs older travellers make as they decide their travel plans. The sample of this study is from a syndicated data source of 200 valid cases from Western Australia. From senior groups, active learner, relaxed family body, careful participants and elementary vacation were identified and discussed. (C) 2003 Published by Elsevier Science Ltd.

Additional notes on systematic of Neotropical Dissomphalus Ashmead (Hymenoptera, Bethylidae)

Diagnosis and genitalia description and illustration of Dissomphalus bicavatusEvans, 1979;D. bispinulatusEvans, 1969;D. brasiliensisKieffer, 1910;Z). caviclypeus Evans, 1969; D. cornutus Evans 1964; D. dumosus, Evans, 1966; D. fungosus Evans, 1979; D. gilvipes Evans, 1979; D. incomptus Evans, 1964; D. infissus Evans, 1969; D. mendicus Evans, 1969; D. microstictus Evans, 1969; D. mirabilis Evans, 1966; D. nanellus Evans, 1969; D. napo Evans, 1979; D. plaumanni Evans, 1964; D. punctatus (Kieffer, 1910); D. puteolus Evans, 1969; D. rufipalpis Kieffer, 1910; D. xanthopus Ashmead, 1893 are provided. Female of D. mirabilis is first described. Five synonymies are proposed: D. connubialis Evans, 1966 of D. brasiliensis, D. montanus Kieffer, 1910 of D. punctatus, D. obliquus Evans, 1979 of D. rufipalpis, D. teren Evans, 1969 of D. cornutus and D. hastatus Evans, 1979 of D. bispinulatus. D. microtuberculatus sp.n. from Northern Argentina is described and illustrated.

A atuação do professor de Educacao fisica nos centros de atencao álcool e drogas

Esta dissertação teve como objetivo conhecer e analisar a atuação do professor de Educação Física no tratamento de pessoas que fazem uso prejudicial de álcool e outras drogas, especificamente em dois Centros de Atenção Psicossocial Álcool e Drogas (CAPSad) da região da Grande Vitória, ES, buscando elementos para subsidiar a questão a partir dos professores e demais integrantes da equipe multidisciplinar. Antes de adentrar no tema da pesquisa, considerei necessário expor os caminhos que fizeram com que se encontrassem, ao longo da história, os personagens protagonistas deste trabalho – professor de Educação Física e CAPSad. Para isso, retomei a Reforma Psiquiátrica Brasileira, a instituição dos CAPS, as intervenções políticas em álcool e outras drogas e a inserção do professor de Educação Física na saúde mental/saúde pública. A metodologia empregada foi a observação e a condução de entrevistas semiestruturadas com os professores e trabalhadores da equipe de saúde. Na descrição e análise dos dados, foi possível constatar que há certa semelhança nas atividades desenvolvidas pelos professores em ambos os CAPSad, os quais demonstraram a participação na equipe de modo multidisciplinar e intersetorial. A pesquisa demonstrou a relevância dos professores de Educação Física não somente como mais um membro da equipe, portador de uma série de intervenções, mas como um trabalhador que pode vir a somar significativamente com o campo da saúde mental. Mesmo não possuindo formação específica para atuarem, os professores se mostraram comprometidos com o trabalho dos CAPSad a partir de práticas corporais e outras atuações que evidenciam as relações humanas.

Culturas, políticas e novas identidades: uma leitura europeia sobre questões de género na Ásia

Este ensaio discute algumas leituras críticas de textos teóricos da área das ciências sociais e humanas sobre o estatuto de género em países asiáticos, tentando estabelecer quais as suas principais problemáticas e metodologias. Presta especial atenção à questão das vozes femininas silenciadas e das práticas ignoradas do quotidiano das mulheres, problematizando o que sucede – ou pode suceder – quando às mulheres é permitido não só possuir um espaço social próprio (“a room of their own”, para citar Virginia Woolf), mas também uma voz própria. Para Edward Said o conceito ocidental de orientalismo implicava uma concepção masculina particular do mundo, mais evidente em romances e diários de viagem, onde as mulheres eram geralmente criaturas da fantasia masculina de poder. Esta concepção masculina do mundo oriental tende a ser estática, construindo-se assim o estereótipo do “eterno oriental”. As mulheres, tal como o “oriental”, nunca falam de si mesmos, das suas verdadeiras emoções, desejos e histórias: têm de ser representados, alguém tem de falar por si. No âmbito deste estudo, analisam-se alguns processos ideológicos e retóricos através dos quais a identidade das mulheres é construída e representada, tanto pelas próprias mulheres, como por vozes substitutas. A etnografia, a antropologia, a historiografia, a ficção, a cultura popular, os media e todos os tipos de fontes textuais e visuais desempenham um papel de relevo na invenção e na reinvenção de antigas e de novas identidades femininas, e na circulação destas no tempo e no espaço.

Atividades de investigação em Geometria: uma experiência no 2º ano de escolaridade

Dissertação apresentada à Escola Superior de Educação de Lisboa para obtenção de grau de mestre em Ciências da Educação, especialidade Educação Matemática na Educação Pré-Escolar e nos 1.º e 2.º Ciclos do Ensino Básico

Aviação comercial: tendências e satisfação dos passageiros

Dissertação de Mestrado, Ciências Económicas e Empresariais, 15 de Janeiro 2014, Universidade dos Açores.

Deep ocean species. The little that is known mostly comes from collected specimens. Comment on L.A. Rocha et al. Letter "Specimen collection: An essential tool" (23 May, 344: 814).

Deep Ocean Species. The little that is known mostly comes from collected specimens. L.A. Rocha et al. Letter "Specimen collection: An essential tool" (23 May, 344: 814) brilliantly discuss the importance of specimen collection and present the evolution of collecting since the mid-19th century until our present strict codes and conducts. However, it is also important to emphasize the fact that the vast majority of deep ocean macro-organisms are only known to us because of collection and this is a strong argument that should be present in our actions as scientists. If the deep is considered the least known of Earth’s habitats (1% or so according to recent estimates) then what awesome collection of yet to discover species are still there to be properly described? As the authors point citing (1), something around 86% of species remain unknown. Voucher specimens are fundamental for the reasons pointed out and perhaps the vast depths of the World’s oceans are the best example of that importance. The resumed report of 2010 Census of Marine Life (2) showed that among the millions of specimens collected in both familiar and seldom-explored waters, the Census found more than 6,000 potentially new species and completed formal descriptions of more than 1,200 of them. It also found that a number of rare species are in fact common. Voucher specimens are essential and, again agreeing with L.A. Rocha et al. Letter (see above), the modern approach for collecting will not be a cause for extinctions but instead a valuable tool for knowledge, description and even, as seen above, a way to find out that supposed rare species may not be that rare and even prove to reach abundant populations.

A linguagem do espaço em Henry James: a fase madura

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Lipid extractions from marine deep-sea invertebrates : modifications to the Bligh & Dyer method to increase lipid yields

The deep-sea environment is difficult to sample, and often only small quantities of samples can be obtained when using less destructive methods than dredging. When working with marine animals that are difficult to sample and with limited quantities of tissue to extract lipids, it is essential to ensure that the used method extracts the maximum possible quantity of lipids. This study evaluates the efficiency of introducing modifications to the method originally described by Bligh & Dyer (1959). This lipid extraction method is broadly used with modifications, although these usually lack proper description and evaluation of increment in lipids. In this study we consider the improvement in terms of amount of lipids extracted by changing the method. Lipid content was determined by gravimetric measurements in eight invertebrates from the deep-sea, including deep-sea hydrothermal vents animals, using three different approaches. Results show increases of 14% to 30% in lipid contents obtained from hydrothermal vent invertebrate tissues and whole animals by placing the samples in methanol for 24 hours before applying the Bligh & Dyer mixture. Efficiency of the extractions using frozen and freeze-dried samples was also compared. For large sponges, the use of lyophilized materials resulted in increases of 3 to 7 times more lipids extracted when compared with extractions using frozen samples.

Soluções de transporte ferroviário: simulação de marcha e de tráfego de veículos de tração diesel e elétrica

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica