Nitrogen Laser
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. Temporal variation of bacterial population and response to physical and chemical parameters along a petrochemical industry wastewater treatment plant
Abstract: The petrochemical industry has played a considerable role in generation and release of waste in the environment. Activated sludge and facultative lagoons are commonly used for domestic and industrial wastewater treatment due to their low-cost and minimal need for operational requirements. Microorganisms present in wastewater treatment plant (WWTP)
An. Acad. Bras. Ciênc.. Publicado em: 01/07/2019
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2. Effects of oral administration of S-nitrosothiols and knectic evaluation of the kinetic propensity and resistance to diet induced obessity / Efeitos da administração orogástrica de s-nitrosotióis e avaliação cinética da propensão e resistência à obsidade induzida por dieta
In the present study, the nitric oxide (NO)-associated physiological actions obtained topically on the gastric mucosa and systemically in oral administrations of two NO donors-S-nitrosothiols (RSNOs), S-nitrosoglutathione (GSNO) and S-nitroso-N-acetylcysteine (SNAC) were investigated in animal models. The topical ex vivo administration of RSNOs solutions on
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2011
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3. Avaliação da porosidade de microcápsulas contendo proteína bioativa por porosimetria de mercúrio e adsorção de nitrogênio
Microcapsules containing lactoferrin were produced by spray drying using dextrin:octenylsuccinate starch, as wall materials. Porosity characteristics of spray-dried microcapsules were investigated by mercury intrusion porosimetry and nitrogen adsorption. The outer and inner structures of microcapsules were studied by Scanning Electron Microscopy and sizes we
Química Nova. Publicado em: 2011-09
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4. Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route
Polycrystalline strontium-doped lanthanum manganite (LSM) powders with 0.15, 0.22, and 0.30 mol % Sr were synthesized by the polymeric precursor route using a molar ratio of 3:1 citric acid and metal cations. The powders were characterized by Fourier transform infrared spectroscopy, thermal analysis, high-temperature X-ray diffraction to determine the crysta
Materials Research. Publicado em: 01/04/2011
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5. Medidas de velocidade de arrastamento de elétrons no isobutano puro / Measurements of electron drift velocity in pure isobutane
The electron drift velocity characterizes the electric conductivity of weakly ionized gases and is one of the most important transport parameters for simulation and modelling of radiation detectors and plasma discharges. This work presents the results of electron drift velocity as a function of the reduced electric field obtained in pure nitrogen and pure is
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2010
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6. Estudo da dopagem em nanotubos de carbono por espectroscopia Raman ressonante.
Doping of single wall carbon nanotubes with boron, nitrogen, phosphorous and sulfur was studied by resonance Raman spectroscopy. The doping atoms were inserted in the tube walls during synthesis, by using chemical vapor deposition, laser ablation and arc discharge methods. The analysis of the Raman spectra shows that the insertion of dopants generates tubes
Publicado em: 2009
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7. Estudo da reatividade do estado excitado triplete de 1,4-diaza-9-fluorenonas frente a doadores de hidrogênio e de elétron
The effect of the introduction of nitrogen atoms upon the triplet excited state reactivity of 1,4-diaza-9-fluorenone (1) and 1,4-diaza-9-benz[b]fluorenone (2), in acetonitrile, was investigated employing the nanosecond laser flash photolysis technique. The intersystem crossing quantum yield (Φces) for 1 and 2 was determined using 9-fluorenone as a secondary
Química Nova. Publicado em: 2009
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8. Análises espectroscópicas da matéria orgânica de solos sob aplicação de águas residuárias / Spectroscopic analyses of soil organic matter under irrigation with trated wastewater
Around the world there is a growing competition for the use of water among several sectors of society. Water consumption in agriculture is large when compared to other types of use and can affect the availability of water for the urban population unless it is well administered. In Brazil, agriculture consumes about 61% of the total freshwater. Among the diff
Publicado em: 2008
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9. Estudo da fotodegradação de petróleo por ressonância paramagnética eletrônica
Paramagnetic species have been found in the Brazilian Petroleum (BP) and Arabian Light (AL) by means of EPR, before and after irradiation. Two oil samples are of the AL petroleum, a crude oil called Total Arabian (TA) and an other sample distilled at 260oC, called Partial Arabian (PA). The BP was used in the crude form without treatment. Three oil sa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2007
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10. Otimização do processo de usinagem de titânio com laser pulsado de neodímio / I. A. ALMEIDA. Optimization of Titanium Machining by Pulsed Nd:Yag Laser. 2007. Thesis (Doctoral) - Tecnologia Nuclear Materiais - IPEN, Universidade de São Paulo, São Paulo, 2007.
The main goal of this work was to establish the requirements for laser processed parts to satisfy uniform surface finish, low roughness and preservation of the mechanical and functional properties of the parts. Lasers became a versatile machining tool that satisfies the modern trends in material processing. In this study, the cutting quality factors of sheet
Publicado em: 2007
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11. Estudos espectroscópicos de vidros sódio aluminofosfatos co-dopados com Yb3+ e Tm3+ / Spectroscopic studies of glasses sodium aluminophosphatos co-dopad with Yb3+ and Tm3+
This work presents a throughout near-infrared and visible spectroscopic characterization of two sets of Yb3+ and Tm3+ codoped sodium aluminophosphate glasses, prepared in nitrogen and ambient atmospheres. In these samples, the Yb3+ ions are employed as efficient sensitizers of 0.98 µm excitation, with subsequent energy transfer to Tm3+ ions. Results are dis
Publicado em: 2007
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12. Moisture effective diffusivity in porous solid mixtures / Difusividade efetiva de agua em misturas de solidos porosos
Porous solids have been applied in several industrial sectors, mainly as mixture of different solids. The physical characterization as well as the effective diffusivity of these materiaIs are important to the optimization of industrial processes that apply mass transport in porous solids. Investigations about effective diffusivity in solid mixture indicated
Publicado em: 2007