Oscillations
Mostrando 1-12 de 1048 artigos, teses e dissertações.
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1. El Niño-Southern Oscillation impacts on grape yields in Santana do Livramento, Brazil: understanding and early warning of crop failure conditions
ABSTRACT El Niño-Southern Oscillation (ENSO) is an important source of year–to–year fluctuations in the whole global climate system and in the southern Brazilian climate. El Niño events affect this region, imposing unfavorable weather conditions (rainy/humid/overcast) during critical grapevine phenological stages, compromising yields in the current and
Revista Ceres. Publicado em: 2023
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2. PARAMETERS FOR MODELING PASSIVE SUSPENSIONS OF SPRAY BARS
ABSTRACT The uniformity and quality of spraying depend on the stability of the spray boom, defined as the suspension system between the boom and the machine chassis. This paper presents a procedure for improving the performance of passive spray bar suspensions through parameter adjustment. Two multibody dynamics models of a tractor sprayer set were developed
Eng. Agríc.. Publicado em: 2021-05
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3. Greenhouse gas emission, water quality and straw decomposition as a function of rice postharvest field management
ABSTRACT The objective of this paper was to evaluate the quality of water drained after the use of the knife-roller (an implement used to incorporate rice residues after harvest), the partial global warming potential (pGWP) and straw decomposition as a result of postharvest field management of irrigated rice. The experiments were conducted during the 2018 an
Bragantia. Publicado em: 2020-09
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4. “Valve-In-Valve” Mitral por Via Transeptal: Um Papel de Destaque no Tratamento da Disfunção de Biopróteses no Brasil?
ABSTRACT The objective of this paper was to evaluate the quality of water drained after the use of the knife-roller (an implement used to incorporate rice residues after harvest), the partial global warming potential (pGWP) and straw decomposition as a result of postharvest field management of irrigated rice. The experiments were conducted during the 2018 an
Arq. Bras. Cardiol.. Publicado em: 2020-09
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5. An Alternative Spectrophotometric Determination of Carbaryl Insecticide Residues in Water Samples Using the Cerium-Catalyzed Belousov-Zhabotinsky Oscillating Reaction
An alternative approach for carbaryl determination based on the change in the oscillation period of the Belousov-Zhabotinsky (BZ) reaction under the addition of carbaryl is demonstrated. The oscillations were observed by spectrophotometric measurement at 320 nm, corresponding to the maximum absorption wavelength of cerium(IV) catalyst. The oscillation period
J. Braz. Chem. Soc.. Publicado em: 2020-05
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6. Facial Nerve Intraoperative Monitoring in Otologic Surgeries under Sedation and Local Anesthesia - A Case Series and Literature Review
Abstract Introduction Local anesthesia with sedation has been employed for an increasingly number of otolaryngology procedures, and might be associated with lower surgical morbidity and costs. Facial nerve monitoring is often advisable in otology to minimize the risks of injuries to this cranial nerve, but the principles, techniques and parameters involved
Int. Arch. Otorhinolaryngol.. Publicado em: 2020-03
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7. Center of gravity oscillations in HTLV-1-associated myelopathy/tropical spastic paraparesis
Resumo Introdução: o controle postural em indivíduos com mielopatia associada ao HTLV-1 ou paraparesia espástica tropical (HAM/TSP) é geralmente comprometido, o que aumenta o risco de quedas, dificulta a realização de atividades de vida diária e prejudica a qualidade de vida. O perfil das oscilações do centro de gravidade nesta população é desc
Fisioter. mov.. Publicado em: 13/01/2020
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8. Uma proposta experimental para o estudo de oscilações acopladas usando um simulador de propagação de ondas mecânicas em meios sólidos
Resumo Neste artigo, apresentamos inicialmente um aparato, construído com materiais de fácil acesso, que pode ser empregado no estudo da lei de Hooke utilizando-se anéis de garrafa PET. Nesta fase da experimentação, esperamos que o professor reconheça junto aos seus estudantes que um anel mais largo possui constante elástica maior do que outro mais es
Rev. Bras. Ensino Fís.. Publicado em: 10/01/2020
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9. INTEGRATING REAL TIME OPTIMIZATION AND MODEL PREDICTIVE CONTROL OF A CRUDE DISTILLATION UNIT
Abstract This work reports the integration of Real Time Optimization and Model Predictive Control in the multi-layer control structure of an existing Crude Distillation Unit (CDU) of an oil refinery. The MPC considers output control zones and targets for the inputs or outputs. Both the infinite horizon and the finite output horizon controllers were tested. T
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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10. The variability of the subantarctic front and the Southern Hemisphere atmospheric jet
Abstract The latitudinal variations of the Subantarctic Front (SAF) and Southern Hemisphere atmospheric jet were investigated for the period of 1993-2016. Zonal wind velocity, sea surface height and temperature data were used to identify these features over the South Atlantic, South Pacific and Indian Oceans individually. During this period, the atmospheric
Braz. j. oceanogr.. Publicado em: 02/12/2019
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11. Uma cadeia produtiva mais integrada? A utilização do hedge dinâmico na oscilação dos preços diários da cadeia produtiva da carne suína
Resumo Trabalhos recentes têm mostrado uma falta de integração entre o mercado do produtor e o varejo na cadeia produtiva da carne suína. Uma solução para amenizar esse entrave poderia ser feito por meio da estratégia de hedge dinâmico com o modelo Garch-DCC, que permitiria gerenciar as decisões de compra e venda diariamente. Nesse sentido, o objeti
Rev. Econ. Sociol. Rural. Publicado em: 28/11/2019
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12. Numerical Simulation of a Pitching Airfoil Under Dynamic Stall of Low Reynolds Number Flow
ABSTRACT: In this research, viscous, unsteady and turbulent fluid flow is simulated numerically around a pitching NACA0012 airfoil in the dynamic stall area. The Navier-Stokes equations are discretized based on the finite volume method and are solved by the PIMPLE algorithm in the open source software, namely OpenFOAM. The SST k - ω model is used as the tur
J. Aerosp. Technol. Manag.. Publicado em: 14/11/2019