Calibration System
Mostrando 1-12 de 233 artigos, teses e dissertações.
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1. Quantification of Carbon Dioxide (CO2), Methane (CH4), and Nitrous Oxide (N2O) Using Near Infrared Spectroscopy and Multivariate Calibration in High Humidity Levels
In this work we developed a promising analytical method combining Fourier transform near-infrared (FT-NIR) spectroscopic technique and first-order multivariate calibration using partial least-squares (PLS) model to simultaneously quantify the main greenhouse gases (GHG’s): methane (CH4), carbon dioxide (CO2), nitrous oxide (N2O) and water vapor (H2O). The
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. QUANTITATIVE SPECIATION OF THE LIQUID PHASE BY FTIR SPECTROSCOPY IN THE SYSTEM AMP-PZ-CO2-H2O
This work reports a multivariate calibration partial least square regression (PLS) model to quantify the liquid-phase concentrations of 2-amino-2-methyl-1-propanol (AMP), piperazine (PZ), bicarbonate, PZ monocarbamate, and PZ dicarbamate during the absorption/desorption process by Fourier Transform Mid-Infrared spectroscopy (mid-FTIR). The model could predic
Química Nova. Publicado em: 2022
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3. ISO/IEC 17025: history and introduction of concepts
Quality is an increasingly present concept nowadays, so meeting the customers’ needs, who buy and use products and hire services, becomes essential. For laboratories, the concept is applied to the reliability and traceability of the results produced and presents itself not only to meet the customer’s needs, but also to allow the signing of agreements in
Quím. Nova. Publicado em: 2021-06
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4. Progresso da queima das pontas das folhas da cebola sob diferentes programas de aplicação de fungicidas
RESUMO A queima das pontas das folhas da cebola, causada por Botrytis squamosa, é controlada por meio de pulverizações foliares com fungicidas seguindo um calendário fixo, sem considerar o progresso da doença. O regime de pulverização baseado em um sistema de previsão pode prever seu progresso e com isso possibilitar a redução do número de pulveri
Summa phytopathol.. Publicado em: 17/01/2020
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5. Textual Artifact of Advertising: A Thrust of Halliday’s Mood System Resources
RESUMO Este artigo argumenta que a publicidade contém uma variedade de textos que terminologias teóricas são capazes de exemplificar. Assim, dez propagandas de bebidas, entre outros tipos, foram escolhidas para análise. Os recursos de mudança de tom de Halliday decompuseram os textos em componentes significativos, que posteriormente foram tabulados com
Rev. bras. linguist. apl.. Publicado em: 19/06/2019
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6. Dispersive Solid Phase Extraction Headspace Sampling in Gas Chromatography-Mass Spectrometric Analysis of Volatiles: Application to Separation of Polycyclic Aromatic Hydrocarbons
For the first time, dispersive solid phase extraction combined with headspace sampling was introduced and applied to separation and pre-concentration of polycyclic aromatic hydrocarbons (PAHs) as representative of volatile and semi-volatile compounds, from aqueous solutions and sediments using multiwall carbon nanotubes (MWCNTs). After adsorption, PAHs were
J. Braz. Chem. Soc.. Publicado em: 2019-04
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7. Development, calibration and validation of weighing lysimeters for measurement of evapotranspiration of crops
RESUMO O processo de evapotranspiração é fundamental em estudos de balanço e demanda hídrica de culturas e sua determinação pode ser realizada por diversos métodos. Um método muito utilizado, apesar de seu custo elevado de instalação são os lisímetros de pesagem, que consistem em uma caixa sobre uma balança, conectados a uma célula de carga qu
Rev. bras. eng. agríc. ambient.. Publicado em: 2019-04
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8. Investigation of Thermal Effects in Coaxial Probe Method and Dielectric Characterization of Glycerol up to 140°C
Abstract Dielectric properties of a material are of paramount importance in many areas of knowledge. All scientific fields that deal with the interaction of electromagnetic radiation with matter demand this information. Consequently, suitable methods for obtaining accurate dielectric data are required. In the microwave community, the dielectric metrology wit
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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9. Response of the TDR sensor to moisture under different types of management of a typical Latosol in the Cerrado
RESUMO A técnica de Reflectometria no Domínio do Tempo (TDR) tem se destacado na avaliação da umidade do solo, por ser um método instantâneo, não destrutivo, preciso e pouco dependente dos fatores ambientais. Porém, pesquisadores têm enfatizado a necessidade de calibração específica e contínua para cada condição de manejo do solo. Portanto, ob
Rev. Ciênc. Agron.. Publicado em: 2019-03
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10. Evaluation of vestibular and oculomotor functions in individuals with dizziness after stroke
RESUMO Alterações no equilíbrio postural são consequências frequentes no acidente vascular cerebral (AVC). O objetivo deste estudo foi investigar os sintomas e as funções vestibular e oculomotora de sujeitos com tontura após AVC isquêmico e hemorrágico, comparando seus resultados. Métodos: Foram avaliados 50 sujeitos com tontura após AVC, por me
Arq. Neuro-Psiquiatr.. Publicado em: 2019-01
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11. Forced degradation of gliquidone and development of validated stability-indicating HPLC and TLC methods
Forced degradation studies of gliquidone were conducted under different stress conditions. Three degradates were observed upon using HPLC and TLC and elucidated by LC-MS and IR. HPLC method was performed on C18 column using methanol-water (85:15 v/v) pH 3.5 as a mobile phase with isocratic mode at 1 mL.min-1 and detection at 225 nm. HPLC analysis was applied
Braz. J. Pharm. Sci.. Publicado em: 29/11/2018
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12. Phenolic compounds in native potato (Solanum tuberosum L.) cooking water, with potential antioxidant activity
Abstract For over two decades, there has been an increasing interest in finding natural antioxidants, because they can protect the human body from free radicals and retard the progress of many chronic diseases. Phenolic compounds were identified and quantified in potato cooking water from freeze–dried slices with peel and from whole potato stored for 20 d
Food Sci. Technol. Publicado em: 26/07/2018