Detectors
Mostrando 1-12 de 268 artigos, teses e dissertações.
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1. A Physical Study to Explain Response Differences between the BID and FID Detectors for PAHs and Pesticides
The dielectric barrier discharge ionization detector (BID) is one of the most modern detectors commercially available for gas chromatography (GC). Its technology based on the sample ionization through the energy released from the helium plasma generation process gives it the ability to act as a universal detector and a greater response to various types of co
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. How do CO2 and radon gases affect groundwater mining in the Canary Islands?
Abstract Water galleries are mines that seek to supply drinkable and irrigation water from the aquifer, in order to meet the demand for water in the Canary Islands. This sort of work entails a series of health risks in the form of gases. This document compiles three different studies on the gases that can be found in water galleries in the Canary Islands, ha
REM - International Engineering Journal. Publicado em: 2022
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3. Innovative gas chromatographic determination of formaldehyde by miniaturized extraction and on-fiber derivatization, via SPME and SPME Arrow
Formaldehyde (FA) is a carbonyl compound, ubiquitous in the environment and among the most widespread pollutants: it has exhibited toxic properties and is classified as a human carcinogen. FA is released from several sources, both temporary (e.g., combustion processes) and permanent (e.g., building products). This work proposes an innovative fully-automated
Química Nova. Publicado em: 2022
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4. A Gas Chromatography Method for Simultaneous Quantification of Inorganic Gases and Light Hydrocarbons Generated in Thermochemical Processes
This paper reports a method for simultaneous determination of H2, O2, N2, CO, CO2, CH4, C2H2, C2H4, C2H6, C3H4 (propadiene and propyne), C3H6, C3H8 and C4H10 (n-butane and isobutane) by gas chromatography using thermal conductivity and flame ionization detectors. A single porous layer open tubular column (0.53 mm internal diameter ? 30 m length ? 30 µm thic
J. Braz. Chem. Soc.. Publicado em: 2021-06
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5. Damped Jacobi Methods Based on Two Different Matrices for Signal Detection in Massive MIMO Uplink
Abstract For massive multiple-input multiple-output (m-MIMO) uplink, the performances of the linear minimum mean-square error (MMSE) detector are considered near optimal, and they occupy benchmark place for most linear iterative detectors. However, the MMSE algorithm is known by its load computational complexity due to the implication of large-scale matrix i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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6. Mecanismos de limitação da energia de raios cósmicos durante sua propagação
Resumo A cada segundo que passa, um número muito grande de partículas de origem cósmica atravessam o planeta. A maior parte delas pouco interage com a matéria e sua passagem não é percebida, exceto pelos pesquisadores da física de partículas. Os raios cósmicos são um tipo destas partículas, de origem extraterrestre, que podem ser estudados com aux
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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7. Propiedades físicas y cristalinas del Cd1-xZnxTe (0 ≤ x ≤ 1)
ABSTRACT Cd1-xZnxTe (0 ≤ x ≤ 1) and ZnTe are II-VI semiconductors, which are used in single crystalline structure to improve their crystalline and electrical properties. The CZT and ZnTe must possess high crystalline and electrical quality to be used, the first in x or γ-ray detectors, and as substrates for suitable epitaxial films for detecting IR radi
Matéria (Rio J.). Publicado em: 19/07/2018
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8. An Overview of Research into Low Internal Friction Optical Coatings by the Gravitational Wave Detection Community
The direct detection of gravitational waves by ground-based interferometric gravitational wave detectors in recent years has opened a new window of the universe, allowing the astrophysical observations of previously unexplored phenomena, such as the collisions of black holes and neutron stars. However, small thermodynamic fluctuations of the density of the t
Mat. Res.. Publicado em: 24/05/2018
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9. TELAS DE FÓSFORO PARA PROJEÇÃO DE IMAGEM
In this work we describe a methodology to obtain phosphor screens used in various applications to produce images or patterns such as detectors and microscopes. The main advantages of these screens are the particle free and self-heating properties that allows it to be used in controlled environments minimizing the adsorbed gases in the surface of the screen.
Quím. Nova. Publicado em: 2017-09
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10. Risk analysis and reliability of the GERDA Experiment extraction and ventilation plant at Gran Sasso mountain underground laboratory of Italian National Institute for Nuclear Physics
Abstract The aim of this study is the risk analysis evaluation about argon release from the GERDA experiment in the Gran Sasso underground National Laboratories (LNGS) of the Italian National Institute for Nuclear Physics (INFN). The GERDA apparatus, located in Hall A of the LNGS, is a facility with germanium detectors located in a wide tank filled with abou
REM, Int. Eng. J.. Publicado em: 2017-09
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11. Volatile compounds profiles in unroasted Coffea arabica and Coffea canephora beans from different countries
Abstract Aroma is the most important factor in assessing the quality of coffee. The volatile compounds profile could be very important to confirm the authenticity of Coffea arabica. The study was carried out on two species of unroasted coffee beans: Coffea arabica from Colombia and Nepal and Coffea robusta from Uganda and Vietnam. Both Coffea arabica and Cof
Food Sci. Technol. Publicado em: 01/06/2017
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12. Comparison Between Three Chromatographic (GC-ECD, GC-PFPD and GC-ITD-MS) Methods and a UV-Vis Spectrophotometric Method for the Determination of Dithiocarbamates in Lettuce
The purpose of this study was to compare the performance of gas chromatographic with electron capture detector, pulsed flame photometric detector and mass spectrometry (GC-ECD, GC-PFPD and GC-MS) and UV-Vis spectrophotometric methods, based on acidic hydrolysis with tin(II) chloride of dithiocarbamate and analysis of the evolved CS2. For the validation studi
J. Braz. Chem. Soc.. Publicado em: 2017-05