Vacuum Chamber
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Steel desulfurization on RH degasser: physical and mathematical modeling
Abstract Due to the high-quality steel demand, especially for ultra-low Sulfur steel, RH desulfurization has been practiced. Based on this, mathematical and physical modeling have been applied to study steel desulfurization by reagent addition in the RH degasser vacuum chamber. The main result of cold modeling, using water and oil emulating steel and slag, r
REM - International Engineering Journal. Publicado em: 2022
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2. Optical Fiber Spool Acoustic Wave Resonances Employing a Mach-Zehnder Interferometer in Vacuum Chamber
Abstract The longitudinal, flexural, and torsional modes of acoustical resonances are presented for a long and small thickness cylindrical fiber spool. The fiber spool is built using a monomode optical fiber tightly wound in a helix form around a cylindrical Styropor. The acoustical resonance values are obtained using a Mach Zehnder interferometer with the f
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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3. Artificial neural networks modeling of kinetic curves of celeriac (Apium graveolens L.) in vacuum drying
Abstract The objective of this study was to predict celeriac drying curves using artificial neural networks (ANNs). The experimental data for vacuum drying kinetics of celeriac slices reported by other researcher in the previously published article was used. The air temperature, chamber pressure and time values were used as ANN inputs. To predict the moistu
Food Sci. Technol. Publicado em: 30/07/2018
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4. INFLUÊNCIA DO ENVELHECIMENTO ACELERADO EM FLARES MAGNÉSIO/PTFE/FPM
Magnesium/PTFE/FPM decoy flares, also named conventional flares, were designed in order to protect combat aircraft from the threat caused by infrared-guided missiles. Adverse storage or transport conditions may cause reactions that deteriorates chemical properties of the conventional flares, causing the aging and compromising its performance. The aim of this
Quím. Nova. Publicado em: 2017-09
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5. Assessment of differences between products obtained in conventional and vacuum spray dryer
Abstract In this work, an experimental unit of a vacuum spray dryer was built. This prototype attempted to combine the advantages of freeze-drying (drying at low temperatures due to vacuum) and spray drying (increase of surface area aiming the improvement of heat transfer efficiency). Maltodextrin solutions were dried in the vacuum operated equipment and in
Food Sci. Technol. Publicado em: 19/09/2016
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6. Development Status of L75: A Brazilian Liquid Propellant Rocket Engine
ABSTRACT: This paper provides an overview of the design and development process of the L75 Liquid Propellant Rocket Engine (LPRE). Being developed at Instituto de Aeronáutica e Espaço (IAE), it is the first Brazilian open-cycle liquid rocket engine pressurized by turbopump, designed to deliver 75 kN of thrust in vacuum as a cryogenic upper stage engine usi
J. Aerosp. Technol. Manag.. Publicado em: 2014-12
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7. Desenvolvimento de um sistema de aquisição de dados e de controle para a realização de ensaios de emissão eletrônica na câmara de ultra alto vácuo / Development of a data acquisition and control system for electron emission tests in an ultra high vacuum chamber
Foi projetado e desenvolvido um sistema de aquisição de dados e controle para viabilizar, de forma automatizada, a caracterização de emissividade eletrônica em catodos frios, por meio da utilização da câmara de ultra alto vácuo do Departamento de Semicondutores, Instrumentação e Fotônica - DSIF, da Faculdade de Engenharia Elétrica e Computação
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2012
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8. Emissão de elétrons por efeito de campo em dispositivos de grafeno
Since graphene was first isolated in 2004 by the micromechanical exfoliation of graphite, many research groups focused their works in studying the properties of this material. Graphene is a strictly bidimensional system very resilient to mechanical tension which presents high charge carriers mobilities, anomalous quantum hall effect observed even at room tem
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2012
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9. Avaliação da permeabilidade dentária de dentes submetidos à reintervenção endodôntica quando obturados com diferentes cimentos / Evaluation of the permeability of dental teeth underwent reintervention when filled with different endodontic cements
The purpose of this study was to evaluate ex vivo the permeability of root canal dentin walls after the removal of three different combinations of filling materials. To this end, 36 extracted human single-rooted premolars, with similar length and anatomy, had surgery access to the pulp chamber, root canal preparation was performed to F4 ProTaper instruments
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/09/2011
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10. Modelagem e simulação do processo de fermentação extrativa a vácuo com uma câmara de flash e separação do CO2 utilizando uma coluna de absorção / Modeling and simulation of the vacuum extractive fermentation process using a flash chamber and an absorption column for CO2 separation
The ethanol, also known as bioethanol, shows positive characteristics for being used as a large scale fuel, mainly because of the relatively low cost, low pollutant impact compared to fossil fuels and its feasibility of being produced from a renewable matrix through fermentation of vegetable origin products. The conventional fermentation process is typically
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/07/2011
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11. Design and characterization of an RF plasma cleaner
The design and characterization of an innovative device for plasma cleaning, based upon a non-conventional radio-frequency discharge, is described. The RF fields are produced by an antenna placed inside the metallic vacuum chamber. Theoretical models are described to calculate both the electro-magnetic field structure and the spatial impurity distribution, d
Brazilian Journal of Physics. Publicado em: 2010-03
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12. Dynamic behavior of hydrogen desorption from pure iron and inconel 625 during elastic and plastic deformations
Dynamic behavior of hydrogen desorption from pure iron with a body-centered-cubic lattice and Inconel 625 with a face-centered-cubic lattice was examined during tensile deformation using a quadrupole mass spectrometer in a vacuum chamber integrated with a tensile testing machine. Hydrogen desorption from hydrogen-charged specimens was detected under various
Matéria (Rio de Janeiro). Publicado em: 2010