6,450 research outputs found
O porto seco de Dionisio Cerqueira-SC : um caminho a integração Brasil-Argentina
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias JuridicasO presente trabalho tem como propósito traçar a trajetória de uma proposta para a integração Brasil - Argentina, como um caminho possível, prático e econômico, com vistas à inserção do Estado de Santa Catarina no mundo, com a internacionalização de suas economias. A via de integração eleita é o Porto Seco de Dionísio Cerqueira, como realidade e espaço físico fronteiriços, situado nos limites do Município de Dionísio Cerqueira (Extremo Oeste de Santa Catarina), com Bernardo de Irigoyen (Província de Misiones, na Argentina). O Porto Seco de Dionísio Cerqueira é caracterizado, neste estudo, também, como uma realidade jurídico-política, de reconhecimento local, regional, nacional e internacional. O objetivo principal desta proposta de integração é demonstrar a possibilidade de melhor aproveitamento do natural Porto Seco de Dionísico Cerqueira (único porto seco habitado entre o Brasil e a Argentina), como um meio de passagem internacional, um instrumento de comunhão das economias regionais, dotando-o da infra-estrutura de que, no momento, se ressente. Para comprovar a existência de condições de viabilização da idéia inicial, é feita a análise, por amostragem, da estrutura sócio-econômica das micro-regiões de Santa Catarina, dos aspectos históricos do Oeste Catarinense (O tratado de Madrid, a questão dos limites entre o Brasil e a Argentina, a colonização e os meios de comunicação, como fatores de integração), de seus aspectos biogeográficos, da estrutura sócio-econômico-política do Município de Dionísio Cerqueira e da Zona especial de uso aduaneiro do Porto Seco. Para melhor compreensão da proposta, examina-se o lado argentino do Porto Seco e se avalia a proximidade do Paraguai, como elementos integrativos. Para a solidificação da proposta, apresenta-se o referido porto, como uma criação do Direito Interno Brasileiro (legislação que reflita e permita a desejada integração dos povos dos países limítrofes, respeitado o direito internacional e a soberania das nações interessadas na cooperação mútua, com incentivo ao transporte rodoviário, férreo e marítimo). Como vias possíveis de integração, o Oceano Atlântico, em que a BR 101 é o principal caminho de acesso, tomando, como pontos de referência o Porto Seco de Dionísio Cerqueira e o terminal de São Francisco do Sul. A análise avaliativa de todo o processo de implementação da proposta permite que se conclua afirmando que, na concepção do projeto, levou-se em conta tanto a posição privilegiada e estratégica do Município de Dionísio Cerqueira, como a redução de distâncias entre os diversos centros econômicos brasileiros e estrangeiros. A proposta alicerça-se na Teoria da Integração, como principal referencial teórico do trabalho. Através do histórico do processo integrativo brasileiro - argentino, procura-se mostrar os avanços, os recursos e as aparentes contradições que o tema oferece, como parte de um processo maior e complexo, desenvolvido na América Latina e no Mundo. O processo de integração é delineado como um processo aberto e a fronteira como uma mera realidade física, que não pode servir de obstáculo à integração regional
Implementation of an Optically-Controlled antenna in a dual-band communications system: Systemic characterization with photonic down conversion
No full textThis work presents the development of an optically controlled slot antenna, capable of operating at two different resonant frequencies, 2.5 GHz and 5.1 GHz. A silicon switch controls the frequency operation. The proposed antenna design was analyzed in terms of S-parameters and gain. Measured results show a difference of 20 dB for the reflection coefficient and 3 dB in the antenna gain, between the switch "on" and "off" states. The prototype was also tested under a data transmission in a multi band photonic down conversion system. Measurements results show the quality antenna performance in the reception compared to a fixed broadband antenna
Implementation of a Broadband Photonics-assisted RF Amplifier Toward 5G Networks
No full textWe report the implementation of a photonics-assisted RF amplifier for broadband and multiband 5G networks. A 2 Gsymb/s signal with different digital modulation formats at 20 GHz and a 100 Msymb/s high-order digital modulated signal at 6 GHz have been used for characterizing the proposed technology as a function of the RF gain, signal-to-noise ratio and error vector magnitude. Experimental results demonstrate RF amplification, reconfigurability, distortion absence and low phase noise levels through 6, 20 and 38 GHz frequency bands, which have been considered potential for the future 5G networks
Birefringence Properties Of Hybrid Photonic Crystal Fibers
No full textWe present a fabrication and an experimental investigation of the birefringent properties of a Highly Birefrigent Hybrid Photonic Crystal Fiber. Polarization dependent loss as high as 21 dB is experimentally obtained on the photonic bandgap edges. ©2009IEEE.804805Knight, J.C., Photonic Crystal Fibres (2003) Nature, 424, pp. 847-851. , AugustArismar Cerqueira Jr., S., Luan, F., Cordeiro, C.M.B., George, A.K., Knight, J.C., Hybrid photonic crystal fiber (2006) Optics Express, 14, pp. 926-931Arismar Cerqueira Jr., S., Cordeiro, C.M.B., Biancalana, F., Roberts, P.J., Hernandez-Figueroa, H.E., Brito Cruz, C.H., Hybrid photonic crystal fiber,Nonlinear interaction between two different photonic bandgaps of a Hybrid Photonic Crystal Fiber (2008) Optics Letters, 33. , SeptemberSchreiber, T., Stress-induced single-polarization single-transverse mode photonic crystal fiber with low nonlinearity (2005) Optics Express, 13, pp. 7621-763
High Precision Displacement Measurements in presence of Multiple Scatterers using a Photonics-based Dual-band Radar
No full textIn this work, a dual-band photonics-based radar system is described for precise displacement measures in a multi-target scenario. The radar has been designed for application of monitoring and prevention of possible structural failures of buildings and landslides. The radar system exploits the Stepped Frequency Continuous Wave (SFCW) signal modulation and differential phase measurements are carried out on each range bin to evaluate target displacements. The system effectiveness has been already demonstrated in presence of a single target. Here we present a numerical and experimental evaluation of the displacement estimation accuracy in the case of a multi-target scenario. Our study is focused to understand how the presence of multiple targets impacts on their displacement estimates. Simulation results show a typical accuracy of less than 0.2 mm for distances up to 400 m. These results are confirmed by preliminary experimental outcomes, which take into account different operative conditions in a first measure campaign with multiple targets. Finally, concluding remarks and perspectives draw the agenda for our future investigations
Single-polarization State Hybrid Photonic Crystal Fiber
No full textIt is presented a single-polarization operation of a Hybrid Photonic Crystal Fiber with at least 200 nm bandwidth. Experimental results demonstrate polarization dependent loss as high as 23 dB on the photonic bandgap edge. Near field images are also presented. ©2010 IEEE.1/FevArismar Cerqueira Jr., S., (2010) Rep. on Progress in Physics, 73, p. 024401Arismar Cerqueira Jr., S., (2006) Opt. Express, 14, p. 926Arismar Cerqueira Jr., S., (2008) Opt. Letters, 33, p. 2080Goto, R., (2009) Opt. Letters, 20, p. 3119Schreiber, T., (2005) Opt. Express, 13, p. 762
5G NR RoF System Based on a Monolithically Integrated Multi-Wavelength Transmitter
No full textWe propose and demonstrate the use of a monolithically integrated multi-wavelength transmitter for multiband 5G new radio (NR) radio-over-fiber (RoF) systems, simultaneously operating in the standalone (SA) and non-standalone (NSA) modes. The novel integrated photonic circuit, integrating eight tunable and directly modulated distributed feedback lasers, aims to reduce the transmitter complexity and footprint, enabling compact, high-performance and low-cost 5G solutions for frequencies up to 10 GHz. We report the implementation of a 4G/5G shared optical mobile fronthaul using two 5G NR and a LTE-A signals, evaluated in two distinct scenarios, as a function of root mean square error vector magnitude (EVMRMS) and in accordance to the 3GPP Release 15 requirements. In the first phase, three optical carriers in C-band are independently modulated with three mentioned RF signals, whereas subcarrier multiplexing (SCM) is applied to the second scenario for jointly modulating an optical carrier at 1554 nm. Gbit/s throughput is demonstrated for validating the applicability of our monolithically integrated multi-wavelength transmitter either for enabling multiapplication and/or diverse RF standards, using a single wavelength or multiservice exploiting different wavelengths from an unique optical source
A dual-band slotted waveguide antenna array for radars applications
No full textThis paper describes the design and fabrication of a novel dual-band slotted waveguide antenna array for radar applications. The radiation structure is composed by two groups of slots, milled into the rectangular waveguide in opposite faces, enabling the antenna operation over two different frequency bands. Using this innovative structure becomes possible to perform diverse sorts of tracking using a unique structure for different radar applications, such as maritime navigation, surveillance and communications. Numerical results were obtained by ANSYS HFSS and measurements demonstrate two operational bandwidths over the S- and C-frequency bands. The antenna gain varies from 14.41dBi to 17.64dBi at 2.25GHz and 4.91GHz, respectively
Sabethes soperi Lane & Cerqueira 1942
No full text<p> <i>soperi</i> Lane & Cerqueira, 1942</p> <p> (subgenus <i>Peytonulus</i>)</p> <p>Type locality (restricted). Tinguá, Nova Iguaçu, Rio de Janeiro, Brazil.</p> <p> <b>Bionomics</b>. Females of this species have been collected with human landing catches in the Amazon rainforest (Cerqueira 1961).</p> <p> <b>Arbovirus infection records</b>. This species was found naturally infected with Macaua virus in the Brazilian Amazon (Hérve <i>et al</i>. 1986) and YFV in midwestern and southern Brazil (Dégallier <i>et al</i>. 1992; Stanzani <i>et al</i>. 2023).</p> <p> <b>Occurrence in Brazil</b>. States of Acre, Bahia, Distrito Federal, Espírito Santo, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Paraná, Rio de Janeiro, Rio Grande do Sul, and São Paulo (Lane & Cerqueira 1942; Lane 1953; Forattini <i>et al</i>. 1986a; Xavier <i>et al</i>. 1989; Dégallier <i>et al</i>. 1992; Vasconcelos <i>et al</i>. 1997; Guimarães <i>et al</i>. 2000 a, 2000b; Cardoso <i>et al</i>. 2005; Hutchings <i>et al</i>. 2005; Santos <i>et al</i>. 2008; Lira-Vieira <i>et al</i>. 2013; Abreu <i>et al</i>. 2019; Stanzani <i>et al</i>. 2023).</p> <p> <b>Occurrence in other countries</b>. Argentina and Bolivia (Wilkerson <i>et al</i>. 2021).</p>Published as part of <i>Neves, Maycon Sebastião Alberto Santos, Motta, Monique Albuquerque, Maciel-De-Freitas, Rafael, Xavier, Alexandre Da Silva, Lourenço-De-Oliveira, Ricardo & Silva-Do-Nascimento, Teresa Fernandes, 2024, Illustrated identification key to females of the genus Sabethes Robineau-Desvoidy recorded from Brazil (Diptera: Culicidae), in dichotomous and interactive formats, including an updated list of species and new records for the states, pp. 253-287 in Zootaxa 5406 (2)</i> on pages 272-273, DOI: 10.11646/zootaxa.5406.2.3, <a href="http://zenodo.org/record/10618240">http://zenodo.org/record/10618240</a>
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