3,111 research outputs found
Development of hollow-core photonic bandgap fibres free of surface modes
No full textConventional optical fibres can only guide light in a high refractive index core by total internal reflection. By using total internal reflections it is not possible to guide light in an air core. Light guidance in air is of great interest for various technological and scientific applications and has only recently been possible with the advent of photonic band gap fibres. However, the transmission performance of silica/air hollow-core photonic bandgap fibres has until now been affected by the existence of surface modes. These surface modes couple with the air-guided mode in specific spectral ranges inside the bandgap simultaneously increasing the attenuation and dispersion of the air-guided mode and reducing the useable bandwidth of the fibre. Therefore, for many applications it is important to eliminate surface modes or at least reduce their impact on the air mode. The fabrication of the first hollow-core photonic bandgap fibre with no surface modes is presented in this thesis. The fibre has state-of-the-art attenuation over the full spectral width of the bandgap. As a result of the elimination of surface modes the fibre presents increased bandwidth, reduced dispersion and dispersion slope compared to previous hollow-core photonic bandgap fibers. These advances have been possible due to the development of a modified fabrication method which makes the production of low-loss hollow-core fibers both simpler and 5 to 6 times quicker than previously. This development makes hollow-core fibres with improved performance more readily available than ever before
Política externa equatoriana: o governo Rafael Correa e a busca por autonomia
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Sócio Econômico, Programa de Pós-Graduação em Relações Internacionais, Florianópolis, 2014.Nesse breve início de século XXI, o movimento de massas volta a existirem vários países da América Latina, entretanto, este movimento popularestá órfão de uma teorização que possa dar as bases para as grandestransformações em favor das maiorias, de modo que este estudopretende ser um pequeno tijolo na teorização sobre as transformaçõesque vem ocorrendo em um importante ator da América Latina, a Repúblicado Equador. Para cumprir essa função, trabalha-se com o seguinteproblema analítico: ?Como as mudanças internas, externas e regionais, apartir de 2007 (em comparação com o período anterior, de 1980 a 2007)afetaram o grau de autonomia da política externa do país?? A abordagemaqui aplicada objetiva focalizar as relações, processos e estruturaseconômicas internacionais, e ao mesmo tempo, tratar do relacionamentoentre as classes dentro do Estado equatoriano, e das relações do Estadoequatoriano com os países centrais e organizações intergovernamentais/multilaterais. Propor-se a tratar de autonomia em termos gerais eautonomia em termos de política externa é algo de extrema importânciapara a realidade latino-americana. O estudo da política externa equatorianaserá evidenciado através da comparação em dois períodos temporais,a saber: 1980-2007 (a ?longa noite neoliberal?) e de 2007-2013 (astransformações com a chegada ao poder de Rafael Correa). Inicialmentese desdobra as perspectivas teóricas e metodológicas que nortearão otrabalho sobre a autonomia em política externa do governo de RafaelCorrea para logo avançar na investigação das relações sistêmicas quecaracterizam a autonomia na política externa do governo de Rafael Correa,tanto em suas manifestações econômicas e quanto nas políticas, e,por último se verifica como se produz as combinações entre as relaçõeseconômicas e as relações políticas, no âmbito do aparelho estatal. Conclui-se que as mudanças da política externa tem que cada vez mais, enfrentaros desafios que consistem em conciliar o processo de transformaçãointerna com a turbulência do mercado mundial, com as transformaçõesem nível tecnológico e com a complexidade em direção a umprograma socialista de transformação.In that brief beginning of XXI century, the mass movement returned inseveral Latin American countries, however, this popular movement isorphan of a theory that can give the basis for the major changes in favorof the majority, so this study intended to be a small brick in theorizingabout the changes that are occurring in an important player in LatinAmerica, the Republic of Ecuador. Aiming to fulfill this role, it workswith the following analytical problem: "How internal, external and regionalchanges, since 2007 (compared to the previous period, from 1980to 2007) affected the degree of autonomy of foreign policy country??Analytical problem was formulated thereby because it was observed thatinternational insertion chanced from 2007 to a differentiated andgrounded in discourse privileging at least theoretically, autonomy regardingdecision making and execution of foreign policy. The approachintroduced here aims to focus on relationships, processes and internationaleconomic structures and at the same time, address the relationshipbetween the classes within the Ecuadorian state, and the Ecuadorianstate relations with central countries and intergovernmental and multilateralorganizations. Propose analyzing autonomy in general terms andautonomy in foreign policy is something of extreme importance for theLatin American reality. Studying Ecuador's foreign policy is evidencedby comparing two time periods, namely 1980-2007 (the "long neoliberalnight") and 2007-2013 (the transformations with the coming to power ofRafael Correa). Initially we drill down into the theoretical and methodologicalperspectives that will guide the work on autonomy in foreignpolicy of the government of Rafael Correa and then investigate the systemicrelationships that characterize autonomy in foreign policy of thegovernment of Rafael Correa, in its economic and political demonstrations,and other, and finally look at how it produces the combinations ofeconomic relations and political relations in the context of the state apparatus.It is concluded that the changes of foreign policy must increasinglyface the challenges that appear of the combination of the processof inner transformation with the turbulence of the global market, withchanges in technological level and the complexity toward a socialistprogram processing
Necrophilous Histeridae (Insecta: Coleoptera): What do We Know after 200 Years?
No full textCorrea, Rodrigo C., Leivas, Fernando W. T., Moura, Daniel P., Almeida, Lucia M. (2020): Necrophilous Histeridae (Insecta: Coleoptera): What do We Know after 200 Years? The Coleopterists Bulletin 74 (2): 375-383, DOI: 10.1649/0010-065X-74.2.375, URL: http://dx.doi.org/10.1649/0010-065x-74.2.37
Proposições legislativas relacionadas à agroenergia em tramitação na Câmara dos Deputados e no Senado Federal
No full textConsultoria Legislativa - Área X - Agricultura e Política Rural.Nome do autor na página de rosto: Rodrigo H. C. Dolabella
Regulamento da inspeção industrial e sanitária de produtos de origem animal (Riispoa)
No full textConsultoria Legislativa - Área X - Agricultura, Pecuária, Abastecimento e Desenvolvimento Rural. Nome do autor na capa: Rodrigo H. C. Dolabella
Biocombustíveis na Argentina : políticas públicas e evolução recente
No full textConsultoria Legislativa - Área X - Agricultura, Pecuária, Abastecimento e Desenvolvimento Rural.Nome do autor na página de rosto: Rodrigo Hermeto C. Dolabell
The medieval ‘scientia' of structures: the rules of Rodrigo Gil de Hontañón
No full textMedieval builders didn't have a scientific structural theory, however gothic cathedrals were not build without a theory. Gothic masters had a ‘scientia', a body of knowledge which permitted the safe design of their buildings. The nature of this theory has not only a historical or erudite interest; perhaps something could be learned from the true masters of masonry architecture.
Literary sources from the gothic period are scarce; in almost all we find structural rules to design the principal structural elements: walls, vaults (ribs and keystones) and, above all, buttresses. These rules (arithmetical or geometrical) conduced in most cases to a certain proportions independently of size, to geometrically similar designs (for example, the depth of a buttress is a fraction of the span). Very rarely, and this is the case with Rodrigo Gil, appeared arithmetical rules which lead to non-proportional designs (following Rodrigo's rule the buttresses become more slender in relation to the span as the size increases).
These rules were a means to register stable forms. Proportional rules are, as has pointed Professor Heyman, essentially correct. It is a problem of stability and not of strength. Non-proportional rules express a finer adjustment to some non-proportional design problems: buttress design for the thin domical cross vaults (bóvedas baídas), boss design for the vaults themselves, and wall design for towers. The rules were deduced empirically, give correct dimensions, but above all draw our attention to some significant facts of design which so far have remained unnoticed
Transposição da rede de recursos genéticos animais para o portfólio de recursos genéticos para a alimentação, agricultura e bioindústria.
No full textEditores técnicos: Rodrigo Cezar Franzon, Caroline Marques Castro, Alexandre Floriani Ramos, Sueli Correa Marques de Mello. SIRGEALC
Diversidade genética em trigos sintéticos usando marcadores moleculares.
No full textEditores técnicos: Rodrigo Cezar Franzon, Caroline Marques Castro, Alexandre Floriani Ramos, Sueli Correa Marques de Mello. SIRGEALC
Rodrigo Terra Cambará: um herói muito problemático e suas mediações
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Programa de Pós-Graduação em Letra
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