Far Infrared
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Structure-Physical Properties Relationship of Eutectic Solvents Prepared from Benzyltriethylammonium Chloride and Carboxylic Acids
Deep eutectic solvents (DESs) have attracted the attention of the researchers as alternative solvents due to desirable properties such as easy preparation and high thermal stability. In this work, it was reported the preparation of five DESs from benzyltriethylammonium chloride (BTEAC) as quaternary ammonium salt (QAS) and carboxylic acids (oxalic, malonic o
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. TITANYL SULPHATE, AN INORGANIC POLYMER: STRUCTURAL STUDIES AND VIBRATIONAL ASSIGNMENT
In this work, anhydrous titanyl sulfate (TiOSO4) was synthesized and characterized by elemental analyses and vibrational spectroscopy by the first time. In order to verify the stability of the crystallographic structure reported in the literature, an optimization calculation of the unit cell geometry was done with the CRYSTAL17 software, and the agreement wi
Quím. Nova. Publicado em: 05/12/2019
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3. Methodologies for Characterization of Aerospace Polymers/Energetic Materials – a Short Review
ABSTRACT Fourier transform infrared spectroscopy techniques, associated or not to others, are a well-studied subject used for characterizing polymers/energetic materials that have been employed mainly in aerospace industries. However, the infrared analyses are usually qualitative and performed using the mid-infrared. This paper discusses the Fourier transfor
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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4. Desenvolvimento de dispositivos bolométricos para detecção de radiação infravermelha distante = : Development of bolometric devices for far-infrared radiation detection / Development of bolometric devices for far-infrared radiation detection
This work has as a main goal the fabrication and characterization of thermal sensors, described as bolometrics, which are dedicated to detection of far infrared radiation. These sensors are fabricated using microfabrication techniques and the thin films are selectives to wet etching. These mechanical microstructures are formed on silicon wafers using a surfa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2012
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5. Assessment of the synthesis routes conditions for obtaining ammonium dinitramide by the FT-IR
Abstract Over the last two decades, many routes have been proposed to synthesize ammonium dinitramide (ADN). However, most of them lie in routes in which reactants are too expensive for large-scale production. In this sense, the use of ordinary reactants is of paramount importance in this case. The aim in this synthesis consists on nitrating a starting react
J. Aerosp. Technol. Manag.. Publicado em: 2011-12
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6. Construção de uma célula de gás de baixo custo para análise no infravermelho
Infrared spectroscopy is a versatile technique used for qualitative and quantitative determination of all types of molecular species. As far as analysis of confined or flowing gases is concerned, different types of cell can be found in the market, but they are often very expensive. This study describes the construction of a very efficient gas cell with good
Química Nova. Publicado em: 2011
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7. Tecnologia do Pó de Turmalina Preta
The black tourmaline powder of shorlite-dravite series, NaFe3Al6(Si6O18)(BO3)3(OH)3OH, has been used in agricultures and in the production of cosmetics, paints, tissues, water and air purifiers. The pyroelectricity and the emission of far infrared radiation of tourmaline are the main properties explored by most products. The black tourmaline shows significan
Publicado em: 2008
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8. Absorção induzida no infravermelho longínquo na fase líquida do metano / Induced far infrared absorption in liquid phase of methane
As funções de correlação temporal para o momento de dipolo induzido do metano CH4 líquido, foram simuladas pelo método de dinâmica molecular em quatro estados termodinâmicos, a densidades de 28,10; 27,29; 26,41 e 25,34 mol/dm3 e temperaturas de 91,2; 100,7; 110,7 e 122,2 K respectivamente. Foram avaliadas as funções de 2- 3- e 4-corpos, mostraram s
Publicado em: 2008
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9. QCD Green functions and their application to hadron physics
In a functional approach to QCD the infrared behaviour of Landau gauge Green functions is investigated. It can be proven that the ghost Dyson-Schwinger equation implies the Gribov-Zwanziger horizon condition. Its relation to the Kugo-Ojima confinement scenario is elucidated. Positivity violation for gluons is demonstrated, and the analytic structure of the g
Brazilian Journal of Physics. Publicado em: 2007-03
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10. THz imaging and photometry of thermal and non-thermal sources / Fotometria e imageamento THz de fontes termicas e não-termicas
Este trabalho apresenta importantes informações sobre tecnologia THz, atualmente considerada um desafio tecnológico e estado da arte em diversas áreas de desenvolvimento. Com o objetivo de formar um sistema imageador THz, ainda indisponível comercialmente, foram dispensados esforços em diferentes frentes. Câmeras para o infravermelho médio (8 ? 14 µ
Publicado em: 2007
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11. DEVELOPMENT OF FAR-INFRARED PHOTODETECTORS BASED ON INTRABAND TRANSITIONS IN GAAS/ALGAAS MULTI-QUANTUM WELLS / DESENVOLVIMENTO DE FOTODETECTORES DE INFRAVERMELHO DISTANTE UTILIZANDO TRANSIÇÕES INTRABANDA EM POÇOS QUÂNTICOS MÚLTIPLOS DE GAAS/ALGAAS
Nas Forças Armadas do Brasil existe uma forte demanda pelo desenvolvimento de detectores de infravermelho nacionais para uso em diversas aplicações sujeitas a rígidas restrições de importação, como sistemas de imageamento infravermelho para visão noturna, guiamento de mísseis, sistemas de mira, etc. O objetivo deste trabalho foi desenvolver fotodet
Publicado em: 2006
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12. EVALUATION OF THE PERFORMANCE OF THE METHOD OF TPH DETERMINATION (TOTAL HYDROCARBON PETROLEUM) IN SAND FOR DETECTION IN INFRA RED / AVALIAÇÃO DO DESEMPENHO DO MÉTODO DE DETERMINAÇÃO DE TPH (TOTAL PETROLEUM HYDROCARBON) EM AREIA POR DETECÇÃO NO INFRAVERMELHO
This dissertation deals with an optimization of TPH (Total Petroleum Hydrocarbon) analysis methodology for samples of contaminated sands, validating the infrared detection technique through the use of Infracal TOG/TPH equipment. Tests were validated using Marine Fuel 380 oil, density 0.987 g cm-3 and viscosity 5313 cP at 20 0C. This oil sample was kindly sup
Publicado em: 2003