Infrared Detector
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Carbon Dots from Pilosocereus gounellei for Fluorimetric Determination of Tannin in Tea Using a Flow-Batch System
In this study, xiquexique (Pilosocereus gounellei) native endemic cactus from the Brazilian semiarid was used for the first time as a natural carbon source (“green precursor”) for the synthesis of highly fluorescent carbon dots (CDs). These CDs were successfully used to develop a fast, low-cost, eco-friendly fluorescence method for the determination of t
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. Is it still worth Publishing Case Reports? They are Part of our Lives
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
Braz. J. Cardiovasc. Surg.. Publicado em: 2020-10
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3. Kinetic Parameters of the Thermal Oxidation and Degradation Reactions in Soybean Oil and Palm Olein
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
J. Braz. Chem. Soc.. Publicado em: 2020-10
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4. Influencia del ácido ascórbico en el crecimiento de nanorods de oro con banda de plasmón longitudinal en el infrarrojo cercano-NIR
ABSTRACT The present work reports the ascorbic acid effect (0,60-0,98 µM) on the aspect ratio (AR) of gold nanorods with bands of longitudinal plasmon (LP) in the near infrared (958 -1085 nm), grown by seed-mediated chemical route. Cloroauric acid-1mM as precursor agent was used, obtained from a stock solution prepared by dissolving metallic gold (99,99%) i
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Poly (Methyl Methacrylate)-SiC Nanocomposites Prepared Through in Situ Polymerization
In this study, polymeric nanocomposites based on poly(methyl methacrylate) (PMMA) and silicon carbide (SiC) nanoparticles were prepared by radical mass polymerization in the presence of filler. Nanoparticles of SiC with and without surface treatment with organosilane were obtained .The nanocomposites were characterized by X-ray fluorescence (XRF), infrared s
Mat. Res.. Publicado em: 03/09/2018
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6. Operational Measurements for Infrared Camera Characterization
ABSTRACT: The detection, location, identification and recognition are very important activities for the air forces. Imaging systems are tools used for those functions, so it is mandatory to characterize those systems to really know their actual operational limits. This paper presents a set of measurements for spectral, radiometric and spatial camera characte
J. Aerosp. Technol. Manag.. Publicado em: 2017-12
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7. SELECTIVE SYNTHESIS OF PEG-MONOESTER USING CESIUM HETEROPOLY ACID AS HETEROGENEOUS CATALYST
Esterification of oleic acid with polyethylene glycol 600 (PEG-600) to produce polyethylene glycol monooleate (PEG-monooleate) and polyethylene glycol dioleate (PEG-dioleate) as by-product has been studied in the presence of heterogeneous acid catalysts, i.e. cesium heteropoly acid (Cs HPA). The results are compared with those obtained from a classical homog
Quím. Nova. Publicado em: 2017-06
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8. Strontium and Nickel Heterogeneous Catalysts for Biodiesel Production from Macaw Oil
It is presented herein heterogeneous catalysts comprised of strontium and nickel oxides synthesized using a coprecipitation method. They were applied for the preparation of biodiesel from macaw palm oil. The catalysts were characterized by X-ray diffraction (XRD), adsorption and desorption of nitrogen by Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halend
J. Braz. Chem. Soc.. Publicado em: 2017-02
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9. INVESTIGATION OF IMPREGNATED ACTIVATED CARBON PROPERTIES USED IN HYDROGEN SULFIDE FINE REMOVAL
Abstract The effects of relative humidity (RH), carbon dioxide (CO2), methane (CH4), oxygen (O2) presence and gas hourly space velocity (GHSV) on H2S adsorption dynamics of KOH/CaO impregnated activated carbon are investigated in this study. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray detector (SEM-EDX), thermogravimetr
Braz. J. Chem. Eng.. Publicado em: 2016-12
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10. COMPARAÇÕES ENTRE MEDIÇÕES EM TEMPO REAL DA pCO2 AQUÁTICA COM ESTIMATIVAS INDIRETAS EM DOIS ESTUÁRIOS TROPICAIS CONTRASTANTES: O ESTUÁRIO EUTROFIZADO DA BAÍA DE GUANABARA (RJ) E O ESTUÁRIO OLIGOTRÓFICO DO RIO SÃO FRANCISCO (AL)
Carbon dioxide (CO2) fluxes from aquatic systems are generally derived from the gradient in the partial pressure of CO2 (pCO2) between air and surface waters. In this study, we compare real-time measurements of water pCO2 using an equilibrator and non-dispersive infrared gas detector, with calculations based on pH and total alkalinity (TA) in two contrasting
Quím. Nova. Publicado em: 2016-12
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11. Recovery of α-Al2O3 from Ionizing Radiation Dosimetric Sensors
Corundum, sapphire or α-Al2O3 is an important technological material in many optical and electronic applications such as solid-state lasers, optical windows and, more recently, as a radiation detector. Landauer (Glenwood, IL, USA) accumulated large number of archived and stored Luxel™ dosemeters composed of Al2O3:C, which were subjected to a recovery proc
Mat. Res.. Publicado em: 2015-02
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12. Pré-processamento digital de imagens obtidas na faixa espectral do infravermelho distante / Digital image processing in the longwave infrared spectral range
Este trabalho apresenta a pesquisa e desenvolvimento de algoritmos de pré-processamento digital de imagens para câmeras térmicas não refrigeradas na faixa espectral do infravermelho distante. O estudo de câmeras infravermelhas é uma questão estratégica, uma vez que tem aplicações militares, civis e científicas. Este trabalho define a concepção e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2012