Nitrous Oxide
Mostrando 13-24 de 266 artigos, teses e dissertações.
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13. Experimental Investigation of a Monopropellant Thruster Using Nitrous Oxide
ABSTRACT: Nitrous oxide is a monopropellant with potential for use in propulsion systems for orbit correction, positioning and attitude control of satellites. This paper presents experimental results with a 2N thruster prototype employing nitrous oxide gas decomposed by a rhodium oxide catalyst supported on alumina. Initially, the thruster design, the test b
J. Aerosp. Technol. Manag.. Publicado em: 2014-12
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14. Inhalation conscious sedation with nitrous oxide/oxygen in pediatric dentistry
MedicalExpress (São Paulo, online). Publicado em: 2014-06
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15. DNA damage and antioxidant status in medical residents occupationally exposed to waste anesthetic gases
PURPOSE: To investigate the effects of occupational exposure to waste anesthetic gases on genetic material and antioxidant status in professionals during their medical residency.METHODS: The study group consisted of 15 medical residents from Anesthesiology and Surgery areas, of both genders, mainly exposed to isoflurane and to a lesser degree to sevoflurane
Acta Cir. Bras.. Publicado em: 2014-04
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16. Stimulation of Acidic Reduction of Nitrite to Nitric Oxide by Soybean Phenolics: Possible Relevance to Gastrointestinal Host Defense
This study aimed to evaluate the potential of soybean-promoted acidic nitrite reduction and to correlate this activity with the content of phenolics and with the bactericidal activity againstEscherichia coliO157:H7. Extracts of embrionary axes and cotyledons enriched in phenolics increased •NO formation at acidic pH at values that were 7.1 and 4.5 times hi
Publicado em: 15/06/2013
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17. Nitrous oxide emissions from an intermittent aeration activated sludge system of an urban wastewater treatment plant
This study investigated the emission of N2O during the sequential aerated (60-min) and non-aerated (30-min) stages of an intermittent aeration cycle in an activated sludge wastewater treatment plant (WWTP). N2O emission occurred during both stages; however, emission was much higher during aeration. Air stripping is the major factor controlling transfer of N2
Quím. Nova. Publicado em: 2013
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18. Emissões de óxido nitroso do tanque de aeração de uma estação de tratamento de esgotos com sistema de lodos ativados convencional
Nitrous oxide (N2O) emissions were measured monthly from January to June 2010 in the aeration tank of a wastewater treatment plant (WWTP) in Southeast Brazil. Emissions were lower in summer than winter and were positively related with influent ammonium (NH4+) concentration. The average N2O emission was 1.11 kg N day-1 corresponding to 0.02% of the influent t
Quím. Nova. Publicado em: 2013
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19. Controle da ansiedade odontológica: estudo comparativo entre a sedação oral com midazolam e a sedação consciente com a mistura de óxido nitroso e oxigênio em pacientes submetidos à extração de terceiros molares inferiores / Dental Anxiety Control: Study Comparing oral sedation with Midazolam and conscious sedation with Nitrous oxide associated with oxygen in patients undergoing lower third molar extractions
The study objective was to comparatively assess the effect of midazolam 7.5mg P.O. and conscious sedation with Nitrous oxide associated with oxygen at 50% in patients undergoing lower third molar extractions on the change in the anxiety level of patients by means of salivary cortisol dosage, on oxygen saturation level, on heart rate, on blood pressure, and o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2012
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20. Produção de gases de efeito estufa e potencial de geração de créditos de carbono em processos de tratamento de esgoto sanitário
The concept of carbon credits came from the awareness of need to reduce greenhouse gas (GHG) emissions in order to combat the worsening of global warming, discussed and formalized in the Kyoto Protocol. Emission of greenhouse gases as methane, nitrous oxide and carbon dioxide is due to several activities, among them the wastewater treatment, both domestic an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2012
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21. STRATEGIES FOR IMPROVING NITROGEN SUPPLY TO CORN AND WHEAT FROM PIG MANURE AND TO REDUCE SOIL NITROUS OXIDE EMISSIONS / ESTRATÉGIAS PARA MELHORAR O FORNECIMENTO DE NITROGÊNIO AO MILHO E AO TRIGO POR DEJETOS DE SUÍNOS E REDUZIR A EMISSÃO DE ÓXIDO NITROSO DO SOLO
The swine manure is a major source of nitrogen (N) to crops, although its inappropriate use can lead to N losses which in return pollute environment and reduces its value as organic fertilizer. The sustainability of pig farming depends on strategies that could improve crops N utilization from pig slurry and mitigate harmful environmental impact caused by its
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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22. DECOMPOSIÇÃO DE RESÍDUOS CULTURAIS DE PLANTAS DE COBERTURA DE SOLO E EMISSÕES DE ÓXIDO NITROSO / COVER CROPS RESIDUES DECOMPOSITION AND NITROUS OXIDE EMISSIONS
The inclusion of summer cover crops (SCC) in the no-till system is an interesting alternative to promote the addition of elevated quantities of plant biomass and nitrogen (N) to the soil. The C and N dynamics during the SCC residue decomposition can control the nitrous oxide (N2O) fluxes to the atmosphere. This study was carried out to quantify the SCC resid
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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23. The effect of intracuff alkalinized 2% lidocaine on emergence coughing, sore throat, and hoarseness in smokers
OBJECTIVE: We evaluated whether endotracheal tube (ETT) intracuff alkalinized lidocaine was superior to saline in blunting emergence coughing, postoperative sore throat, and hoarseness in smokers. METHODS: In our prospective, double-blind trial, we enrolled 50 smoking patients undergoing surgery under general anesthesia including nitrous oxide (N2O). Patient
Revista da Associação Médica Brasileira. Publicado em: 2012-04
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24. DEPLOYMENT OF METHOD FOR ANALYSIS OF STABLE CARBON ISOTOPES (N-ALKANES C1-C5) IN GAS SAMPLES AT LOW CONCENTRATIONS / IMPLANTAÇÃO DE MÉTODO PARA ANÁLISE DE ISÓTOPOS ESTÁVEIS DE CARBONO (N-ALCANOS C1-C5) EM GASES A BAIXAS CONCENTRAÇÕES
The concentration and isotopic composition of n-alkanes C1-C5 has revealed as a powerful tool for interpretation of interesting processes in the oil exploration industry, studies of global climate change, oil biodegradation and carbon cycle elucidation. In this context, studies about methane analysis have been distinguished and multiplied due to the importan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/10/2011