Carbon Dioxide Concentration
Mostrando 1-12 de 302 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. SUPERCRITICAL EXTRACTION OF LYOPHILIZED STRAWBERRY ANTHOCYANINS WITH PULSED ELECTRIC FIELDS PRETREATMENT
The lyophilized strawberry anthocyanins were extracted using a supercritical extraction (SE) process. The effect of pulsed electric fields (PEF) as pretreatment and the influence of the addition of ethanol as a cosolvent on the percentage of extraction yield (EY) and the total anthocyanin concentration (TAC) were analyzed. The effect of PEF was evaluated at
Química Nova. Publicado em: 2022
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3. Proposal of a method for service life prediction of a concrete structure: a case study
Abstract This article presents a method for service life prediction of concrete structures. The proposed method aims to estimate the performance of a concrete structure through its permeability to carbon dioxide penetration, in order to verify its accordance to Brazilian standards. This case study is based on an inspection made in an educational building in
REM, Int. Eng. J.. Publicado em: 2020-09
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4. Forma urbana e poluição atmosférica: impactos na cidade do Rio de Janeiro
Resumo Cidades crescem em importância como polos de concentração de população, assim como em seu papel potencial como fontes de poluição atmosférica. Este artigo investiga possíveis impactos de aspectos da forma urbana nas concentrações desses contaminantes. Dado que esse é um tema ainda incipiente em estudos urbanos no Brasil, a pesquisa traz um
urbe, Rev. Bras. Gest. Urbana. Publicado em: 21/11/2019
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5. CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS
Abstract CO2 biofixation of the microalgae Chlorella sp. for different CO2 concentrations and gas flow rates in a bubble column reactor has been investigated in this study. Microalgae were cultivated under different CO2 concentrations (at 1.75% and 9.45% v/v) and gas flow rates (at 30, 50 and 70 ml/min). The maximum specific growth rate of Chlorella sp. was
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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6. INDUSTRIAL PLANT FOR PRODUCTION OF Spirulina sp. LEB 18
ABSTRACT Biorefineries based on microalgae produce biofuels and co-products with added value. Microalgae mainly require water, carbon dioxide and sunlight for growth. The bioproducts of the cultivation of these microorganisms can be fully used in a microalgae photobiorefinery. The objective of this work was to study the behavior of physico-chemical variables
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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7. Partial replacement of corn by soybean hulls in high-grain diets for feedlot sheep
Resumo: O objetivo deste trabalho foi avaliar a substituição parcial de milho por cascas de soja, em dietas de alta percentagem de grãos, e seu efeito sobre o comportamento alimentar e os parâmetros de fermentação ruminal em ovinos confinados. Oito carneiros com rúmens canulados foram distribuídos em quatro grupos experimentais, compostos de um contr
Pesq. agropec. bras.. Publicado em: 27/05/2019
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8. Experimental protocol for metabolic acidosis induction by intravenous administration of hydrochloric acid in sheep
RESUMO O objetivo deste estudo foi avaliar a magnitude e a duração das alterações sanguíneas e urinárias, bem como os efeitos colaterais da acidose hiperclorêmica induzida por administração intravenosa de ácido clorídrico, em ovinos. Foram utilizadas cinco ovelhas mestiças, adultas, sadias, com peso médio de 44±2,9kg. A solução de ácido clor
Arq. Bras. Med. Vet. Zootec.. Publicado em: 2019-02
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9. Cardiorespiratory and metabolic determinants during moderate and high resistance exercise intensities until exhaustion using dynamic leg press: comparison with critical load
The objective of this study was to assess cardiovascular, respiratory, and metabolic responses during a commonly used dynamic leg press resistance exercise until exhaustion (TEx) at different intensities and compare with critical load (CL). This was a prospective, cross-sectional, controlled, and crossover study. Twelve healthy young men (23±2.5 years old)
Braz J Med Biol Res. Publicado em: 11/10/2018
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10. Carbon Dioxide Biofixation and Production of Spirulina sp. LEB 18 Biomass with Different Concentrations of NaNO3 and NaCl
ABSTRACT Microalgae are efficient at using solar energy to turn CO2 and nutrients into biomass containing lipids, proteins, carbohydrates and other compounds that may be used to produce bioproducts for human and animal consumption and pharmaceutical use. The aim of this study was to assess the effect of the NaNO3 and NaCl concentration on the growth kinetics
Braz. arch. biol. technol.. Publicado em: 08/10/2018
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11. A Sensitive Voltammetric Determination of Anti-Parkinson Drug Pramipexole Using Titanium Dioxide Nanoparticles Modified Carbon Paste Electrode
In this study, a facile sensor based on TiO2 nanoparticles modified carbon paste electrode was developed for voltammetric determination of pramipexole in pharmaceutical formulations and biological samples. Surface of the fabricated electrode have been characterized using field emission scanning electron microscopy. Under the optimized experimental conditions
J. Braz. Chem. Soc.. Publicado em: 2017-04
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12. EVALUACIÓN DE DES, FSC Y SPME/CG-MS PARA LA EXTRACCIÓN Y DETERMINACIÓN DE COMPUESTOS RESPONSABLES DEL AROMA DE CAFÉ TOSTADO DE VILCABAMBA - ECUADOR
The aim of this study was to compare the usefulness of three extraction methods: solid-phase microextraction (SPME) with four different coating (PDMS, PDMS/DVB, DVB/CAR/PDMS and PA), supercritical fluid extraction with carbon dioxide (SCF) and simultaneous distillation and extraction (SDE) for isolation of flavor compounds from roasted ground coffee (Coffea
Quím. Nova. Publicado em: 2016-07