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Search Results: 1 - 10 of 6896 matches for " Leonardo Bacellar "
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Biodiesel production by hydroesterification of microalgal biomass using heterogeneous catalyst  [PDF]
Yordanaka Reyes, Gisel Chenard, Donato Aranda, Cristiane Mesquita, Mariana Fortes, Rafael Jo?o, Leonardo Bacellar
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.410102
Abstract: This paper assesses the hydroesterification process for the production of Biodiesel from Monoraphidium contortum (MORF-1) microalgae biomass, as it is a sustainable alternative not only economically, but also environmentally and ecologically to replace petroleum diesel fuel. The Biodiesel studied in this work was obtained from fatty acid esterification, a product of microalgae and methanol biomass hydrolysis reaction. CBMM’s (HY-340) niobium oxide powder was used as catalyst. The reactions were carried out in a properly closed autoclave reactor (batch), where the reagents were mixed under constant stirring at 500 rpm for hydrolysis and esterification. The products generated were submitted to gas chromatography and oxidative stability analysis. The hydroesterification process showed itself to be a promising alternative to the conventional biodiesel production process (transesterification) as it favors the use of feedstocks with any acidity and moisture content and may be performed with acid catalyst, which favors high conversions in a small range of time (30 minutes).
A constru??o da identidade de sujeitos deficientes no grupo terapêutico-fonoaudiológico
Leite, Gabriela Almeida;Monteiro, Maria Inês Bacellar;
Revista Brasileira de Educa??o Especial , 2008, DOI: 10.1590/S1413-65382008000200004
Abstract: in this study, we consider the personality of our subjects as being shaped by means of their actions being interpreted by others. this happens via the internalization of roles. these roles are defined, in the first instance, by those persons who provide the most concrete reference points for the child, in particular their family, and beyond that by the wider social group to which they belong. our objective was to reflect upon the formation of the personal identity of mentally disabled young people who were receiving speech therapy, this therapy being conducted in a group context. transcripts of the language used by the subjects in constructing their self image were analyzed. this study was based upon the results obtained from previous research, conducted with groups of siblings of subjects classified as mentally disabled. these results revealed a negative image held by those siblings of their disabled brother or sister. the material analyzed is part of a data bank of videotapes, of disabled youngsters receiving group speech therapy in a school clinic setting, taken over a two year period. this data was transcribed and analyzed according to the guidelines of micro genetic analysis, taking into consideration minute details of interviews and in particular details and clips of interactive episodes. the examination of the data was directed towards the actions of the subjects of the study, their interpersonal relations and the social context in which these took place. the analysis conducted in this study aims to establish a relationship between the images these subjects have of themselves and the image put across by the social group to which they belong. the results demonstrated the resonance of the discourse of the social group in the verbalizations of the subjects. we conclude that to transform the image that the subjects with intellectual disability have of themselves it is necessary to direct actions to those who are close to them, namely family, friends, colleagues a
Geofísica aplicada ao estudo de fluxos da água no solo
Morais, Fernando;Bacellar, Luis de Almeida Prado;
Sociedade & Natureza , 2010, DOI: 10.1590/S1982-45132010000100015
Abstract: the electrical resistivity is common used in studies that intents to understand as occur the flow of water in soil and consequently as occur the groundwater recharge. the main goal of this paper is to evaluate the interference of some physical properties of the ground in the determination of the front of saturation predicted with the use of the electrical resistivity and to compare as if of the a percolating in the vadose zone, observing the variation of gotten profiles of resistivity in an interval of definitive time. experiments were conducted in soils of southeastern complex crystalline rocks of reliance (ba??o complex), within the quadrilátero ferrífero, centro-southern state of minas gerais, brazil. for this experiment it was chosen two different areas by geomorphologic features. the first one is hollow on the slippery slope, with the predominance of lixisols; the second one is nose on the slippery slope, with well-developed topsoil prevalence (ferralsols). the results showed that the electrical resistivity method proved efficient for the delimitation of saturation and evaluation reloading even when it comes to subtle differences in the properties of soil water. it was also possible to establish that in the nose slope percolation is faster than in the hollow.
Geofísica Aplicada ao Estudo de Fluxos da água no Solo / Geophysics Applied to Study of Water Flow in the Soil
Fernando Morai,Luis de Almeida Prado Bacellar
Revista Sociedade & Natureza , 2010,
Abstract: A eletrorresistividade vem sendo bastante aplicada em estudos que buscam compreender como se dá o fl uxo de água no solo e consequentemente a recarga de aquíferos. O presente trabalho teve por objetivo avaliar a interferência de algumas propriedades físicas do solo na determina o da frente de satura o predita com o uso da eletrorresistividade e comparar como se dá a percola o na zona n o-saturada, observando a varia o de perfi s de resistividade obtidos em um intervalo de tempo determinado. Os experimentos foram conduzidos em solos da regi o sudeste do complexo de rochas do embasamentocristalino (Complexo Ba o), no interior do Quadrilátero Ferrífero, centro-sul do Estado de Minas Gerais, Brasil. Foram selecionadas duas áreas que se distinguem pelas características geomorfológicas.A primeira, em encosta com formas c ncavas em planta e em perfi l, com predomínio de argissolos; a segunda, em encosta com forma convexa em planta e perfi l, com predomínio de solos bem desenvolvidos (latossolos). Os resultados mostraram que o método da eletrorresistividade se mostrou efi ciente para a delimita o da frente de satura o e avalia o da recarga mesmo em se tratando de diferen as sutis nas propriedades hídricas do solo. Foi possível ainda estabelecer que na fei o geomorfológica em forma convexa (nose) a percola o se dá de maneira mais rápida que na de forma c ncava (hollow)
Thermal Soliton Correlation Functions in Theories with a Z(N) Symmetry  [PDF]
Leonardo Mondaini
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311221
Abstract: We show that the quantum solitons occurring in theories describing a complex scalar field in (1 + 1)-dimensions with a Z(N) symmetry may be identified with sine-Gordon quantum solitons in the phase of this field. Then using both the Euclidean thermal Green function of the two-dimensional free massless scalar field in coordinate space and its dual, we obtain an explicit series expression for the corresponding solitonic correlation function at finite temperature.
The Rise of Solitons in Sine-Gordon Field Theory: From Jacobi Amplitude to Gudermannian Function  [PDF]
Leonardo Mondaini
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213141
Abstract: We show how the famous soliton solution of the classical sine-Gordon field theory in (1 + 1)-dimensions may be obtained as a particular case of a solution expressed in terms of the Jacobi amplitude, which is the inverse function of the incomplete elliptic integral of the first kind.
Obtaining a New Representation for the Golden Ratio by Solving a Biquadratic Equation  [PDF]
Leonardo Mondaini
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213134
Abstract: In the present work we show how different ways to solve biquadratic equations can lead us to different representations of its solutions. A particular equation which has the golden ratio and its reciprocal as solutions is shown as an example.
Towards a Field Theoretical Stochastic Model for Description of Tumour Growth  [PDF]
Leonardo Mondaini
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.55095
Abstract: We develop a field theory-inspired stochastic model for description of tumour growth based on an analogy with an SI epidemic model, where the susceptible individuals (S) would represent the healthy cells and the infected ones (I), the cancer cells. From this model, we obtain a curve describing the tumour volume as a function of time, which can be compared to available experimental data.
Addition of Bevacizumab to Chemotherapy in Advanced Non-Small Cell Lung Cancer: A Systematic Review and Meta-Analysis
André Bacellar Costa Lima, Ligia T. Macedo, André Deeke Sasse
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0022681
Abstract: Introduction Recently, studies have demonstrated that the addition of bevacizumab to chemotherapy could be associated with better outcomes in patients with advanced non-small cell lung cancer (NSCLC). However, the benefit seems to be dependent on the drugs used in the chemotherapy regimens. This systematic review evaluated the strength of data on efficacy of the addition of bevacizumab to chemotherapy in advanced NSCLC. Methods PubMed, EMBASE, and Cochrane databases were searched. Eligible studies were randomized clinical trials (RCTs) that evaluated chemotherapy with or without bevacizumab in patients with advanced NSCLC. The outcomes included overall survival (OS), progression-free survival (PFS), response rate (RR), toxicities and treatment related mortality. Hazard ratios (HR) and odds ratios (OR) were used for the meta-analysis and were expressed with 95% confidence intervals (CI). Results We included results reported from five RCTs, with a total of 2,252 patients included in the primary analysis, all of them using platinum-based chemotherapy regimens. Compared to chemotherapy alone, the addition of bevacizumab to chemotherapy resulted in a significant longer OS (HR 0.89; 95% CI 0.79 to 0.99; p = 0.04), longer PFS (HR 0.73; 95% CI 0.66 to 0.82; p<0.00001) and higher response rates (OR 2.34; 95% CI 1.89 to 2.89; p<0.00001). We found no heterogeneity between trials, in all comparisons. There was a slight increase in toxicities in bevacizumab group, as well as an increased rate of treatment-related mortality. Conclusions The addition of bevacizumab to chemotherapy in patients with advanced NSCLC prolongs OS, PFS and RR. Considering the toxicities added, and the small absolute benefits found, bevacizumab plus platinum-based chemotherapy can be considered an option in selected patients with advanced NSCLC. However, risks and benefits should be discussed with patients before decision making.
Singularidades do envelhecimento: reflex?es com base em conversas com um idoso institucionalizado
Gamburgo, Lilian Juana Levenbach de;Monteiro, Maria Inês Bacellar;
Interface - Comunica??o, Saúde, Educa??o , 2009, DOI: 10.1590/S1414-32832009000100004
Abstract: this paper deals with some peculiarities of the life of an elderly person living in a long-stay institution, interviewed within a study context in which investigating the language (considered as dialogic practice) of elderly people whose communication skills remained intact was the aim. the narrative allowed us to find out about living conditions and some specific features such as: (1) early institutionalization; (2) the interdependence between the reasons for voluntary institutionalization and the situation regarding abandonment; and (3) the apparent impropriety of using the term "elderly" to include individuals with very different ages. five women and one man were interviewed. these interviews enabled examination of memories, feelings, values, interpersonal relations and the language itself. we hope to provide support for looking at elderly people's communication such that it is considered to be a fundamental symbolic system for social inclusion, instead of centering on changes considered "typical" of old age.
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