Chemical Image
Mostrando 1-12 de 101 artigos, teses e dissertações.
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1. PhotoMetrix UVC: A New Smartphone-Based Device for Digital Image Colorimetric Analysis Using PLS Regression
A novel free PhotoMetrix UVC is proposed for both the operation of a universal serial bus video camera (UVC) and multivariate image analysis, allowing a full solution for point-of-use analysis. A UVC was placed in an open-source 3D-printed chamber illuminated by a white light-emitting diode (LED) with controlled intensity of light. The digital images capture
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. RAPID DETECTION OF VITAMIN C CONTENT IN FRUITS AND VEGETABLES USING A DIGITAL CAMERA AND COLOR REACTION
In this study, we propose a novel method to determine the vitamin C content in fruits and vegetables. The proposed method exploits the image and data processing abilities of computers by coupling a digital camera and a color reaction. An image acquisition device was developed to collect the image information of the solution to be measured after the color rea
Quím. Nova. Publicado em: 2020-12
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3. Morphological, chemical and physiological characterization of Amaranthus spp. Seeds
Resumo: As espécies do gênero Amaranthus possuem grande potencial para alimentação humana, devido às suas propriedades nutricionais e funcionais, entretanto existem poucos estudos fitotécnicos com a cultura inviabilizando o seu cultivo. Visando incentivar a produção dessas espécies objetivou-se com essa pesquisa avaliar e distinguir as característi
J. Seed Sci.. Publicado em: 05/12/2019
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4. B-mode ultrasonography and gray scale histogram for evaluation of the nuchal ligament in Quarter horse
RESUMO: O histograma em escala de cinza (HEC) possibilita a mensuração da quantidade e distribuição da frequência de tonalidades de cinza, fornecendo informações quantitativas, tanto sobre a ecogenicidade quanto a ecotextura dos tecidos. Havendo a necessidade de diminuir a subjetividade das imagens ultrassonográficas do ligamento nucal (LN), esse tra
Pesq. Vet. Bras.. Publicado em: 14/10/2019
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5. Mini-channel Two Phase Flow of Hydrogen Peroxide: Decomposition with Silver Catalyst
ABSTRACT Hydrogen peroxide is a chemical compound which is commonly used as a disinfectant at lower concentrations. The chemical is called as a green propellant for space applications. Water and oxygen are the products after self-decomposition of the compound at higher concentrations. The reaction rate at lower concentrations can be enhanced by using catalys
J. Aerosp. Technol. Manag.. Publicado em: 14/06/2018
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6. Phantoms for diffusion-weighted imaging and diffusion tensor imaging quality control: a review and new perspectives
Abstract: Introduction Diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) combine magnetic resonance imaging (MRI) techniques and diffusion measures. In DWI, the contrast is defined by microscopic motion of water protons. Nowadays, DWI has become important for early diagnostic of acute stroke. DTI images are calculated from DWI images acqui
Res. Biomed. Eng.. Publicado em: 2017-06
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7. Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications
Bimetallic nanoparticles are of special interest for their potential applications for fuel cells, mainly for portable power applications. Among the bimetallic systems, Pt-Pd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. In this work, Pt-Pd alloy bimetallic nanopa
Mat. Res.. Publicado em: 15/05/2017
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8. Efectos de la aplicación de tratamientos isotérmicos sobre el tamaño de grano y la dureza de aleaciones de aluminio AA5083-H116
ABSTRACT In this work is studied the relationship between morphological characteristics of grain and hardness of aluminum alloys AA5083-H116, which has been submitted to several isothermal treatments. For analysis development were used optical and scanning electron microscopy, chemical microanalysis, hardness measurements, differential scanning calorimetry (
Matéria (Rio J.). Publicado em: 02/05/2017
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9. Atmospheric corrosion of Nylon 6,6 in Mauritius
ABSTRACT Plastics are being more and more commonly used for outdoor applications in Mauritius. In this context, the atmospheric corrosion degradation behaviour of nylon 6,6 was observed in the Mauritian atmosphere, having a corrosivity category of C3, according to ISO 9223. The crack width, depth and extent of the cracks formed on the surface were investigat
Matéria (Rio J.). Publicado em: 2016-12
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10. Titanium Dioxide Nanoparticles: Synthesis, X-Ray Line Analysis and Chemical Composition Study
TiO2 nanoparticleshave been synthesized by the sol-gel method using titanium alkoxide and isopropanolas a precursor. The structural properties and chemical composition of the TiO2 nanoparticles were studied usingX-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy.The X-ray powder diffraction pattern confirms that the particl
Mat. Res.. Publicado em: 10/10/2016
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11. Construction of a supercritical fluid extraction (SFE) equipment: validation using annatto and fennel and extract analysis by thin layer chromatography coupled to image
Abstract The present work describes setting up a laboratory unit for supercritical fluid extraction. In addition to its construction, a survey of cost was done to compare the cost of the homemade unit with that of commercial units. The equipment was validated using an extraction of annatto seeds’ oil, and the extraction and fractionation of fennel oil were
Food Sci. Technol. Publicado em: 06/05/2016
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12. Reinforced Transparencies for Aerospace Application – Case Description
ABSTRACT This paper describes the polycarbonate acrylic laminated development that can be applied in aeronautics and aerospace transparencies. The case studied is a laminated double-curved transparency (bubble form) used in an observation side window of a military aircraft. Side windows need strength and specific characteristics, similar to windshields, allo
J. Aerosp. Technol. Manag.. Publicado em: 2016-03