Flatness
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. DESIGN AND EXPERIMENT OF SELF-PROPELLED SYSTEM FOR PADDY FIELD WEEDER BASED ON THE INTERACTION MECHANISM OF WHEEL-SOIL
ABSTRACT Aiming at the low mechanization of paddy field weeding and lack of dedicated agricultural machinery for paddy field weeding in China, a self-propelled system of paddy field weeding machine was designed. The overall structure and working principle of self-propelled system were illustrated and analyzed. The interaction mechanism of wheel-soil during w
Engenharia Agrícola. Publicado em: 2022
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2. Hybrid distributed Raman/EDFA amplifier with hybrid automatic gain control for reconfigurable WDM optical networks
Nowadays, optical amplifiers designs are induced by new requirements generated by optical networks. The introduction of WDM reconfigurable networks with increasing rate from 10-40 Gb/s to 100 Gb/s and beyond, demand new optical amplifiers development with improved gain spectral flatness and noise figure for all operational range of input powers and set-point
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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3. Avaliação dos efeitos de exercícios vocais em vozes normais com análise perceptivo-auditiva, acústica e de imagens laríngeas obtidas por videolaringoscopia de alta velocidade / Immediate effects of vocal exercise in normal voices using perceptual, acoustic analysis and of the high-speed videolaryngoscopy images
The aim is to detect the immediate effect of vocal exercises in normal voices. Thirty healthy subjects from 19 to 45 year old with no vocal complains participated in the study. The sustained vowels /a/ and /E/ were recorded in two moments: the first, we recorded the habitual voice, before any exercises; and the second, after from 1 to 5 minutes of continuous
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/01/2012
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4. Neural Networks Modelling for Aircraft Flight Guidance Dynamics
Abstract: The sustained increase of the air transportation sector over the last decades has led to traffic saturated situations, inducing higher costs for airlines and important negative impacts for airport surrounding communities. The efficient management of air traffic supposes that aircraft trajectories are fully mastered and their impacts can be accurate
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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5. Índices para a representação da paisagem como apoio para levantamento pedológico em ambiente de geoprocessamento
O mapeamento de solos tem ganhado destaque dentro da comunidade científica, pois, à medida em que a preocupação com o meio ambiente aumenta, ocorre a necessidade de se entender cada vez mais a distribuição dos solos na paisagem, tal como seu potencial e limitações de uso. Desta forma, o principal objetivo do trabalho foi aplicar índices de represent
Revista Brasileira de Engenharia Agrícola e Ambiental. Publicado em: 2012-04
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6. Design of distributed optical-fiber raman amplifiers using multi-objective particle swarm optimization
A novel method is presented to design the configuration of pumping lasers of Raman amplifiers using a multi-objective particle swarm optimizer. The goal is to obtain the pump laser wavelengths and powers that maximize the amplifier on-off gain, while maintaining the flatness of the gain over the used bandwidth. We used an algorithm called Multiple Objective
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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7. The cold dark matter model with cosmological constant and the flatness constraint
The Hubble parameter, a function of the cosmological redshift, is derived from the Friedmann-Robertson-Walker equation. The three physical parameters H0, Ω0m and ΩΛ are determined fitting the Hubble parameter to the data from measurements of redshift and luminosity distances of type-Ia supernovae. The best fit is not consistent with the flatness constrain
Brazilian Journal of Physics. Publicado em: 2010-12
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8. Triangular forms for nonlinear systems with two inputs and control of driftless systems on SU(n) with applications in quantum mechanics. / Formas triangulares para sistemas não-lineares com duas entradas e controle de sistemas sem arrasto em SU(n) com aplicações em mecânica quântica.
A presente tese aborda dois problemas distintos e independentes: triangularização de sistemas não-lineares com duas entradas e controle de sistemas sem arrasto que evoluem no grupo especial unitário SU(n). Em relação ao primeiro, estabeleceu-se, através da generalização de resultados bem conhecidos, condições geométricas para que um sistema com d
Publicado em: 2010
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9. Mechanical strength and thermal conductivity of low-porosity gypsum plates
The thermal conductivity and mechanical strength of gypsum and gypsum-cellulose plates made from commercial plaster by a new process have been measured. The gypsum parts made by the new process, 'novogesso', have high mechanical strength and low porosity. The gypsum strength derives from both the high aspect ratio of the gypsum crystals and the strong adhesi
Materials Research. Publicado em: 2009-03
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10. Desenvolvimento de bloco de vedação com barita na composição de partida para blindagem de radiação X
This work main objective is to study the use of bricks in barium X-rays rooms in order to contribute to the optimization of shielding rooms diagnosis. The work was based on experimental measurements of X-ray attenuation (40 to 150 kV), using ceramic seal bearing the incorporation of barium sulfat (BaSO4). Different formulations were studied in three differen
Publicado em: 2009
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11. Characterization of skin-pass mill over-rolling on a IF steel. / Caracterização de um aço IF após relaminação no laminador de encruamento.
The continuous search of the improvement of the competitiveness of the steel front to the succedanea has led to the development of special materials, allowing to take care of three of the main demands of the automotive sector: reduction of weight, fuel economy and increase of the safety of the user. The conditions under which the process of strain hardening
Publicado em: 2009
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12. Design of biped robots with simple dynamics: modeling, control and trajectory generation. / Projeto de robôs bípedes com dinâmica simplificada: modelagem, controle e síntese de trajetórias.
In this thesis we present a new class of biped robots with articulate legs and a torso. The proposed design is constructed by means of applying counter- balances to each link of the leg, and therefore it has some properties that simplifies dramatically the dynamics of the robot. We prove that the result- ing system, under certain assumptions, is exact linear
Publicado em: 2008