Power link budget for propagating Bessel beams

International audienceThe power link budget for a system that transmits and receives propagating Bessel beams is studied. The transmitter and receiver are separated by a distance D and consist of leaky radial waveguides. Full-wave simulations are used to compute the admittance-matrix representation of the system. The resonances of the coupled transmitter and receiver are then derived using classical network theory. For comparison purposes, a second configuration with its transmitter and receiver connected by a circular waveguide is considered. In contrast to the open system, such a configuration is closed and does not radiate. It is found that within the non-diffractive range of the Bessel beam, both closed and open systems exhibit the same resonances within an error of 0.6%. Calculations show that the power efficiency of the open system can exceed 85% within the non-diffractive range. The proposed system may find application in areas such as wireless power transfer, near-field communication and non-destructive evaluation

Generation of non-diffractive Bessel beams by inward cylindrical traveling wave aperture distributions

International audienceThe focusing capabilities of an inward cylindrical traveling wave aperture distribution and the non-diffractive behaviour of its radiated field are analyzed. The wave dynamics of the infinite aperture radiated field is clearly unveiled by means of closed form expressions, based on incomplete Hankel functions, and their ray interpretation. The non-diffractive behaviour is also confirmed for finite apertures up to a defined limited range. A radial waveguide made by metallic gratings over a ground plane and fed by a coaxial feed is used to validate numerically the analytical results. The proposed system and accurate analysis of non-diffractive Bessel beams launched by inward waves opens new opportunities for planar, low profile beam generators at microwaves, Terahertz and optics

Perfil epidemiológico dos feridos por arma branca atendidos na emergência do Hospital Florianópolis.

Trabalho de Conclusão de Curso - Universidade Federal de Santa Catarina. Curso de Medicina. Dapartamento de Clínica Cirúrgica

Diferentes métodos de processamento das rações sobre o desempenho e digestibilidade em leitões na fase de creche

Orientador : Prof. Dr. Alex MaiorkaCo-orientador: Dr. Uislei Antonio Dias OrlandoDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Agrárias, Programa de Pós-Graduação em Ciências Veterinárias. Defesa: Curitiba, 25/03/2014Inclui referênciasÁrea de concentração : Nutrição e alimentação animalResumo: A fim de facilitar a digestão enzimática e melhorar o aproveitamento dos nutrientes da dieta de leitões desmamados são empregados importantes métodos de processamento de cereais e rações. O objetivo do presente trabalho foi verificar o efeito do processamento termomecânico por extrusão do milho e do farelo de soja e condicionamento das dietas pré-inicial e inicial, sobre a digestibilidade e o desempenho zootécnico de leitões na fase de creche. Foram utilizados 432 animais de ambos os sexos, híbridos comerciais (AGPIC 337 x Camborough 25) com peso inicial de 6,70 ± 0,70 kg aos21 dias de idade. O delineamento experimental foi em blocos casualizados, em esquema fatorial 2 x 3 (dois pré-processamentos e três condicionamentos), totalizando 6 tratamentos com 12 repetições de 6 animais cada (3 machos e 3 fêmeas). Foi considerado dois tipos de pré-processamento: milho e farelo de soja comuns (CMS) e milho e farelo de soja extrusados (EMS). Os condicionamentos testados foram: não condicionadas (NC), condicionamento térmico e mecânico (TMC), e condicionamento mecânico (MC). Todas as dietas experimentais foram oferecidas fareladas aos animais. Foram utilizados os pesos iniciais dos leitões ao alojamento na formação dos blocos. Foram avaliados os períodos de 21 a 42, 42 a 63 e 21 a 63 dias de idade dos animais. Os resultados demonstram que a extrusão do milho e do farelo de soja das dietas pré-inicial e inicial, assim como, as rações que não passaram por condicionamento termomecânico (NC) são alternativas viáveis de processamento, com benefícios no consumo de ração, ganho de peso, conversão alimentar e peso médio. Palavras-chave: alimentação, creche, processamento térmico, suínos.Abstract: Aiming to facilitate enzymatic digestion and improve nutrient utilization of diets for weaned piglets important methods of grain processing and animal feed are used. The objective of this study was to investigate the effect of thermomechanical extrusion processing of corn and soybean meal and conditioning of pre-starter and starter diets on digestibility and growth performance of piglets in the nursery phase. 432 animals, males and females, commercial hybrids (AGPIC 337 x Camborough 25) with initial weight of 6.70 ± 0.70 kg at 21 days of age were used. The experimental design was randomized blocks, factorial 2 x 3 (two preprocessing and three conditioning), totaling 6 treatments with 12 replicates of 6 animals (3 males and 3 females). Corn and soybean meal common (CCS) and corn meal and extruded soybeans (ECS): two types of pre - processing was considered. The conditioning were tested: no conditioning (NC), mechanical and thermal conditioning (TMC), and mechanical conditioning (MC). All experimental diets were offered to the animals mash. The initial weights of piglets in the formation of the housing blocks were used. Periods 21-42, 42-63 and 21-63 days of age the animals were evaluated. The results show that the extrusion of corn and soybean meal of pre-starter and starter diets as well as diets that have not gone through thermomechanical conditioning (NC) are viable alternatives for processing, with benefits in feed intake, gain weight, feed conversion and average final weight . Keywords: feed, nursery, swine, thermal proces

Optimized analysis of slotted substrate integrated waveguides by a method-of-moments mode -matching hybrid approach

International audienceA full-wave hybrid formulation is proposed for the efficient and accurate modeling of substrate integrated waveguides by rigorously accounting for all possible interactions among elements such as vertical metallic or dielectric posts and coupling or radiating slots. The method is specifically accelerated in order to maximize the efficiency of the analysis of common structures. Its flexibility allows for the study of a large class of devices, possibly in stacked-waveguide configurations, and for the characterization of radiated fields and input port parameters

Efficient Computation of the Coupling Between a Vertical Line Source and a Slot

International audienceA novel spectral formulation is proposed here for the coupling integral between a cylindrical wave with arbitrary radial wavenumber and azimuthal dependence, and a slot placed on a plane orthogonal to the wavefront. Such a kind of integral is massively encountered in electromagnetic modeling of stratified structures comprising slots and vertical pins or vias. The twofold spatial integral defining the coupling is transformed into an equivalent onefold spectral integral, the integration path of which is selected to obtain Gaussian decay of the integrand. Both propagating and evanescent cylindrical modes are considered. An arbitrary stratification orthogonal to the slot plane can be considered, as well as an arbitrary current on the slot. Numerical comparisons against the standard spatial approach are shown to validate the new formulation, and its advantage in terms of computation cost is investigated in depth

Saggio tecnico aritmetico, geometrico, astronomico ... ovvero metodo breve e facile di eseguir i computi alle dette scienze relativi ...

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 2016Sign.: a4, A-F8Port. con viñeta xil