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Search Results: 1 - 10 of 601847 matches for " R. M. da Silva "
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Application of Photo-Fenton Process for the Treatment of Kraft Pulp Mill Effluent  [PDF]
M. D. Rabelo, C. R. Bellato, C. M. Silva, R. B. Ruy, C. A. B. da Silva, W. G. Nunes
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.44050
Abstract: The present work evaluated the use of photo-Fenton process for the treatment of kraft pulp mill effluent. The photo-Fenton best operating conditions, such as pH, concentration, and H2O2: Fe2+ ratio were evaluated. The efficiency of the treatment was measured by COD (chemical oxygen demand) removal. The results showed that the optimum pH for the photo-Fenton process was equal to 3. The increase in H2O2 application resulted in an efficiency increase of the photo-Fenton process, although this was not a directly proportional relation. For most cases, the H2O2: Fe2+ proportion of 100:1 yielded the best results for COD removal. Solar radiation was more efficient than artificial UV to the COD removal. During the treatment the organic matter of the effluent was more oxidized than mineralized, showing a higher removal of COD than BOD (biochemical oxygen demand) and TOC (total organic carbon), respectively. So, photo-Fenton process increased the BOD/ COD ration but decreased the BOD/TOC ratio.
A broncofibroscopia no diagnóstico etiológico de afec??es pulmonares em pacientes com síndrome da imunodeficiência adquirida
Silva, R.M. da;Chterpensque, A.;
Revista da Associa??o Médica Brasileira , 2000, DOI: 10.1590/S0104-42302000000200012
Abstract: purpose: to evaluate the role of bronchoscopy in diagnosis of pulmonary disease in acquired immunodeficiency syndrome. methods: this study analyses a group of 49 patients with aids diagnosis admitted at nereu ramos hospital - florianópolis - sc. it was selected patients with respiratory simptoms and radiologic signs of pulmonary disease, without etiological diagnosis by sputum analysis. these patients were submitted to bronchoscopy with bronchoalveolar lavage, bronchial brush and transbronchial biopsy. the samples were analyzed by baar, cytomegalovirus, p. carinii, other fungus and bacterioscopy by gram. results: the bronchoscopy was effective on the realization of etiological diagnosis of 71,43% of the cases. the transbronchial biopsy was the most positive technique which confirmed the diagnosis of 59,18% of the cases. the technique with the least positivity was the bronchial brush, with a diagnosis of 4,08% of the cases. the most frequent etiological agent was p. carinii (42,8%), followed by m. tuberculosis (22,86%). no complication was observed in the procedures making. conclusion: the conclusion of this present study was that the bronchoscopy is a secure procedure, with good diagnosis performance for pulmonary disease in this group of patients.
A broncofibroscopia no diagnóstico etiológico de afec es pulmonares em pacientes com síndrome da imunodeficiência adquirida
Silva R.M. da,Chterpensque A.
Revista da Associa??o Médica Brasileira , 2000,
Abstract: OBJETIVO: Avaliar o papel da broncofibroscopia no diagnóstico etiológico de pneumopatias em pacientes positivos ao vírus da imunodeficência humana. MéTODOS: O presente estudo analisa um grupo de 49 pacientes com diagnóstico de síndrome da imunodeficiência adquirida, admitidos no Hospital Nereu Ramos - Florianópolis -SC. Foram selecionados pacientes sintomáticos respiratórios com les o simples ao exame radiográfico do tórax, sem diagnóstico etiológico confirmado por exame de escarro. Tais pacientes foram submetidos à broncofibroscopia com realiza o de lavado broncoalveolar, escovado br nquico e biópsia pulmonar transbr nquica. As amostras foram analisados com bacterioscopia pelo Gram, pesquisa de BAAR, citomegalovírus, P. carinii e outros fungos. RESULTADOS: A broncofibroscopia foi efetiva na realiza o do diagnóstico etiológico em 71,43% dos casos. A biópsia pulmonar transbr nquica foi a técnica com maior positividade, firmando o diagnóstico em 59,18% dos casos. A técnica com menor positividade foi o escovado br nquico, com diagnóstico em 4,08% dos casos. O agente etiológico mais freqüente foi o P. carinii (42,8%), seguido pelo M. tuberculosis (22,86%). Nenhuma complica o foi observada nos procedimentos realizados. CONCLUS O: Concluímos no presente estudo que neste grupo de pacientes a broncofibroscopia foi um procedimento seguro e efetivo para o diagnóstico etiológico de afec es pulmonares.
Alimentos e Nutri??o , 2009,
Abstract: A pesquisa descreve as características físicoquímicas e sensoriais do tomate organico em compara o ao convencional. Amostras de tomate cultivares Carmem e Débora produzidos por cultivo organico e convencional foram avaliadas fisicamente, considerando-se a textura e cor, e quimicamente com rela o ao pH, sólidos solúveis totais e acidez total titulável. As amostras foram também avaliadas sensorialmente quanto ao aroma, sabor, cor e aspecto geral. Os frutos de tomate cultivar Débora e Carmem n o apresentaram diferen as com rela o à tonalidade de vermelho dos frutos provenientes do cultivo organico quando comparado ao convencional. Quanto à textura, os resultados se mostraram similares, entre o lote organico (8,85 N x 105) e convencional (8,47 N x 105) do cultivar Carmem. Para o cultivar Débora foram observados valores de 10,28 N x 105 e 9,38 N x 105 para o cultivo organico e convencional, respectivamente. Quanto aos valores de pH, sólidos solúveis totais e acidez total titulável, foram observadas diferen as entre os dois tipos de cultivo. A análise sensorial dos frutos, revelou diferen as significativas (p<0,05) entre os cultivos organico e convencional apenas para os atributos de sabor e aspecto geral. PALAVRAS-CHAVE: Tomate; análise sensorial; alimentos organicos.
R. M. Lira-da-Silva
Journal of Venomous Animals and Toxins , 1998, DOI: 10.1590/s0104-79301998000100008
How the Charge Can Affect the Formation of Gravastars
R. Chan,M. F. A. da Silva
Physics , 2010, DOI: 10.1088/1475-7516/2010/07/029
Abstract: In recent work we physically interpreted a special gravastar solution characterized by a zero Schwarzschild mass. In fact, in that case, none gravastar was formed and the shell expanded, leaving behind a de Sitter or a Minkowski spacetime, or collapsed without forming an event horizon, originating what we called a massive non-gravitational object. This object has two components of non zero mass but the exterior spacetime is Minkowski or de Sitter. One of the component is a massive thin shell and the other one is de Sitter spacetime inside. The total mass of this object is zero Schwarzschild mass, which characterizes an exterior vacuum spacetime. Here, we extend this study to the case where we have a charged shell. Now, the exterior is a Reissner-Nordstr\"om spacetime and, depending on the parameter $\omega=1-\gamma$ of the equation of state of the shell, and the charge, a gravastar structure can be formed. We have found that the presence of the charge contributes to the stability of the gravastar, if the charge is greater than a critical value. Otherwise, a massive non-gravitational object is formed for small charges.
Simplicial minisuperspace models in the presence of a scalar field
C. Correia da Silva,R. M. Williams
Physics , 1999, DOI: 10.1088/0264-9381/16/7/304
Abstract: We generalize simplicial minisuperspace models associated with restricting the topology of the universe to be that of a cone over a closed connected combinatorial $3-$manifold by considering the presence of a massive scalar field. By restricting all the interior edge lengths and all the boundary edge lengths to be equivalent and the scalar field to be homogenous on the $3-$space, we obtain a family of two dimensional models that include some of the most relevant triangulations of the spatial universe. After studying the analytic properties of the action in the space of complex edge lengths we determine its classical extrema. We then obtain steepest descents contours of constant imaginary action passing through Lorentzian classical geometries yielding a convergent wavefunction of the universe, dominated by the contributions coming from these extrema. By considering these contours we justify semiclassical approximations based on those classical solutions, clearly predicting classical spacetime in the late universe. These wavefunctions are then evaluated numerically. For all of the models examined we find wavefunctions predicting Lorentzian oscillatory behaviour in the late universe.
Charged Gravastar in a Dark Energy Universe  [PDF]
C. F. C. Brandt, R. Chan, M. F. A. da Silva, P. Rocha
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46118

Here we constructed a charged gravastar model formed by an interior de Sitter spacetime, a charged dynamical infinitely thin shell with an equation of state and an exterior de Sitter-Reissner-Nordstrom spacetime. We find that the presence of the charge is crucial to the stability of these structures. It can as much favor the stability of a bounded excursion gravastar, and still converting it in a stable gravastar, as make disappear a stable gravastar, depending on the range of the charge considered. There is also formation of black holes and, above certain values, the presence of the charge allows the formation of naked singularity. This is an important example in which a naked singularity emerges as a consequence of unstabilities of a gravastar model, which reinforces that gravastar is not an alternative model to black hole.

Effect of Ultraviolet Radiation on Fungi Beauveria bassiana and Metarhizium anisopliae, Pure and Encapsulated, and Bio-Insecticide Action on Diatraea saccharalis  [PDF]
I. M. Wenzel Rodrigues, M. R. Forim, M. F. G. F. da Silva, J. B. Fernandes, A. Batista Filho
Advances in Entomology (AE) , 2016, DOI: 10.4236/ae.2016.43016
Abstract: The effect of ultraviolet radiation on entomopathogenic fungi can be very prejudicial for causing damage to the conidia. Formulations can help protecting these fungal structures against radiation. The objective of this study was to evaluate the effect of UV radiation on pure and encapsulated conidia Beauveria bassiana and Metarhizium anisopliae sensu lato, and to evaluate their pathogenicity on the sugarcane borer, Diatraea saccharalis. The pure conidia and the sodium alginate capsules containing the fungi were submitted to the ultraviolet radiation in different temperatures and exposure times. On the pure conidia, the radiation had a deleterious effect after 5 minutes of exposure, going from 94% to 52% germination for B. bassiana and from 96% to 54% for M. anisopliae. The alginate formulation protected the B. bassiana conidia against the radiation in all times they were evaluated (15 minutes to 48 hours), because, even after exposure, the fungi remained viable. The dry encapsulated conidia B. bassiana caused 79.6% mortality of the studied pest and the M. anisopliae caused only 10%.
Estudo da intercala??o de compostos organicos em caulins na forma ácida
Fernandes, M. V. da S.;Silva, L. R. D. da;
Ceramica , 2011, DOI: 10.1590/S0366-69132011000200014
Abstract: the feasibility of using major clays such as kaolin in the adsorption processes, can occur through chemical modification by intercalation in their structures phyllite. samples of kaolin in the region of northeast brazil, one white and one gray of a portion of the region borborema-served in the state of paraiba, were interspersed with dimethylsulfoxide, oxalic acid and citric acid. the characterization natural and modified techniques were used x-ray diffraction, thermal analysis and absorption spectroscopy in the infrared.
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