Aperture Synthesis
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. GO Synthesis of Offset Dual Reflector Antennas Using Local Axis-Displaced Confocal Quadrics
Abstract This work investigates an alternative numerical scheme for the solution of an exact formulation based on Geometrical Optics (GO) principles to synthesize offset dual reflector antennas. The technique is suited to solve a second-order nonlinear partial differential equation of the Monge-Ampère type as a boundary value problem. An iterative algorithm
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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2. Imaging evaluation of hallux valgus
Abstract This work investigates an alternative numerical scheme for the solution of an exact formulation based on Geometrical Optics (GO) principles to synthesize offset dual reflector antennas. The technique is suited to solve a second-order nonlinear partial differential equation of the Monge-Ampère type as a boundary value problem. An iterative algorithm
Radiol Bras. Publicado em: 2020-06
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3. Comportamento da função renal na crioablação percutânea de massa renal
Abstract This work investigates an alternative numerical scheme for the solution of an exact formulation based on Geometrical Optics (GO) principles to synthesize offset dual reflector antennas. The technique is suited to solve a second-order nonlinear partial differential equation of the Monge-Ampère type as a boundary value problem. An iterative algorithm
Radiol Bras. Publicado em: 2020-06
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4. Hidrodissecção modificada para biópsia guiada por tomografia computadorizada de lesões mediastinais: técnica “marshmallow”
Abstract This work investigates an alternative numerical scheme for the solution of an exact formulation based on Geometrical Optics (GO) principles to synthesize offset dual reflector antennas. The technique is suited to solve a second-order nonlinear partial differential equation of the Monge-Ampère type as a boundary value problem. An iterative algorithm
Radiol Bras. Publicado em: 2020-06
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5. Estudo da capacidade de imageamento do protótipo do brazilian decimetric array (PBDA) / Study of the imaging capability of the prototype of brazilian decimetric array (PBDA)
O protótipo do Arranjo Decimétrico Brasileiro - BDA, é um arranjo unidimensional Leste-Oeste de 5 antenas de 4 m de diâmetro, com linhas de base de 18 a 216 m, operando na faixa de freqüências 1,2 - 1,7 GHz, com resolução temporal de ~105 ms e tem produzido desde o inicio das operações e de forma regular, franjas de visibilidade em seus 10 pares de
Publicado em: 2009
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6. Estudo da capacidade de imageamento do protótipo do brazilian decimetric array (PBDA) / Study of the imaging capability of the prototype of brazilian decimetric array (PBDA)
The prototype of the Brazilian Decimetric Array - BDA, is a one-dimensional East-West array, with 5 antennas of 4 m in diameter, with baselines ranging from 18 to 216 m, operating frequencies 1,2 - 1,7 GHz and temporal resolution of ~105 ms. The array has produced since the beginning of operations and on a regular basis, fringe visibilities in its 10 pairs o
Publicado em: 2009
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7. Um Novo Método de Geração de Sinais Complexos / A new method for wave form generation
In this work new applications in digital systems, encryption systems, data transmission, etc., through a new mathematical approach are described. This work presents some new important DNAx technique contributions to mathematics, physics and engineering fields. First of all the DNAx equations are defined and applied to definition of Delta of Dirac function, U
Publicado em: 2006
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8. Texturesynthesisusingstasticalspatialmodels / Síntese de textura utilizando modelos estatísticos espaciais
The scope of this work is the use of methods capable of generating natural looking synthetic textures reproducing previously selected source patterns. Spatial statistic models are the basis for the used methods, specifically autoregressive moving average modeling for parameter estimation and texture pattern generation. Two methods are used for parameter esti
Publicado em: 1998
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9. APPLICATION OF SUCESS OF PROJECTION USE SYNTHESIS OF REFLECTOR ANTENNAS / APLICAÇÃO DE TÉCNICA DE PROJEÇÕES SUCESSIVAS NA SÍNTESE DE ANTENAS REFLETORAS
The shaping of reflector surfaces for satellites hás been considered na efficient alternative to the available for the determination of the optimum shape for this surface, base don Geometrical Optics or Physical Optics approximations. This work investigates the application of the Technique of Sucessive Projections, a generic interative method, to the synthe
Publicado em: 1994
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10. OPTICAL SYNTHESIS OF DUAL REFLECTORS / SÍNTESE ÓTICA DE SISTEMAS DE DUPLOS REFLETORES
The aperture blockage by feed, stalls, and subreflector generally causes degradation of gain and raising of crosspolarisation and sidelobe levels. Consequently, to attend recent recommendations for sidelobe envelope, the design of earth station antennas has employed offset-fed configurations to eliminate blocking effects. Several dual offset designs have bee
Publicado em: 1990
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11. Effect of Glyphosate on Intact Bean Plants (Phaseolus vulgaris L.) and Isolated Cells 1
Whole bean (var. “Eastern Butterwax”) plants and isolated cells were used to investigate possible mechanisms of action of glyphosate [N-(phosphonomethyl)glycine]. Results showed that glyphosate was quickly absorbed by the whole plant but not by individual cells and that it caused a rapid reduction in leaf dry matter accumulation, leaf expansion, leaf ang
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12. Antibiotic-Sensitive TolC Mutants and Their Suppressors
The TolC protein of Escherichia coli, through its interaction with AcrA and AcrB, is thought to form a continuous protein channel that expels inhibitors from the cell. Consequently, tolC null mutations display a hypersensitive phenotype. Here we report the isolation and characterization of tolC missense mutations that direct the synthesis of mutant TolC prot
American Society for Microbiology.