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Search Results: 1 - 10 of 35857 matches for " Luis Guilherme Assis; "
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Os espanhóis canibais: análise das gravuras do sétimo volume das Grands Voyages de Theodore de Bry
Kalil, Luis Guilherme Assis;
Tempo , 2011, DOI: 10.1590/S1413-77042011000200011
Abstract: the article analyses the images done by theodore de bry and their descendants for the grand voyages, collection of reports about the new world published between the 16th and the 17th centuries. from the seventh volume, dedicated to the viaje al río de la plata, from the bavarian soldier ulrico schmidl, we seek to analyze the representations of the indians and of the spaniards that were presented in the images done by the protestant editor.
Biocompatibilidade do cimento de fosfato de cálcio implantado no rádio de coelhos
Moraes, Paola Castro;Padilha Filho, Jo?o Guilherme;Canola, Júlio Carlos;Santos, Luis Alberto dos;Macoris, Delphin da Gra?a;Alessi, Ant?nio Carlos;Castro, Márcio Botelho de;Dória Neto, Francisco de Assis;
Acta Cirurgica Brasileira , 2004, DOI: 10.1590/S0102-86502004000400006
Abstract: purpose: the objective of this paper was to evaluate the biocompatibility of calcium phosphate cement in radius of rabbits. methods: for this experiment, calcium phosphate were implanted in the radius of 16 rabbits, divided in two groups (gi and gii), according to postoperative follow-up of 12 and 26 weeks, respectively. reactions of these biomaterials on animal bone tissue were observed. x-ray, optical densitometry, optical microscopy and scanning electron microscopy analyses were performed. results: it was observed that calcium phosphate cement were partially resorbed during the 26-week follow-up, showing biocompatibility, with absence of inflammatory or other undesirable reactions due to the implants. conclusions: calcium phosphate-based cements did not cause inflammatory reactions when in contact with the osseous tissue, and were therefore biocompatible. follow-up periods longer than 26 weeks are necessary to better evaluate the behavior of calcium phosphate-based cement.
Produ??o e caracteriza??o de anticorpos monoclonais contra toxina épsilon de Clostridium perfringens Tipo D
Freitas, Theonys Diógenes;Heneine, Luis Guilherme Dias;Salvarani, Felipe Masiero;Silva, Rodrigo Otávio Silveira;Lima, Catarina Guimar?es Rocha Dourado;Pires, Prhiscylla Sadan?;Assis, Ronnie Antunes de;Lobato, Francisco Carlos Faria;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782008005000051
Abstract: clostridium perfringens type d is the aetiological agent of enterotoxemia in ruminants. the disease is caused by epsilon toxin characterized by cardiac, pulmonary, kidney and brain edema. monoclonal antibodies were produced by using myeloma cell line p3-x63-ag8 653 fused with spleen cells from balb/c mice, immunized with epsilon toxoid of c. perfringens type d. six hybrids were established secreting monoclonal antibodies of the igm class and igg3 subclass.
Fantasia e conhecimento: um estudo crítico preliminar
Mola, Luis Guilherme Coelho;
Psicologia USP , 1999, DOI: 10.1590/S0103-65641999000200003
Abstract: the purpose of this article is to discuss the role played by imagination in the process of knowledge production. using as theoretical support the ideas of some philosophers of the frankfurt school, the text attempts to demonstrate that imagination has a critical function, denied by positivism, which could contribute for the questioning of the organization of society.
Fantasia e conhecimento: um estudo crítico preliminar
Mola Luis Guilherme Coelho
Psicologia USP , 1999,
Abstract: Neste artigo discute-se o lugar ocupado pela fantasia no processo de produ o do conhecimento. A partir do referencial fornecido por autores ligados à Escola de Frankfurt, procurou-se demonstrar que a fantasia possui uma fun o crítica, negada pela concep o positivista de ciência, que pode contribuir para o questionamento da maneira pela qual a realidade se encontra constituída.
Microeletrodos: II. Caracteriza??o eletroquímica
FERTONANI, Fernando Luis;BENEDETTI, Assis Vicente;
Eclética Química , 1997, DOI: 10.1590/S0100-46701997000100014
Abstract: the electrochemical behavior for pure platinum microelectrode and its alloys (pt-ir (20%, m/m); pt-rh (10%, m/m)) microelectrodes were studied in aqueous solution containing 6.00 x 10-3 mol l-1 [k4fe(cn)6] + 1 mol l-1 kcl. the electrodes were prepared as flat microdisc with re = 30 to 150 mm. the true steady state condition was not obtained for any of the microelectrodes used. the near-steady state equations were used in all experiments and the average curve represents the steady state current up to the first half part of the i/e curve for microelectrodes with re 70 mm, which represents a kind of transition dimension from microelectrode to semi-microelectrode. in spite of these observations, the mathematical equations normaly used to evaluate the linear and radial diffusion contribution to the total current of a cyclic voltammogram showed a good agreement with experimental results for all microelectrodes used in this work.
Microeletrodos: I. Constru??o e caracteriza??o
FERTONANI, Fernando Luis;BENEDETTI, Assis Vicente;
Eclética Química , 1997, DOI: 10.1590/S0100-46701997000100013
Abstract: platinum, platinum-iridium (20 wt.%) and platinum-rhodium (10 wt.%) alloys were prepared as microwires using different methods. microwires of pt and its alloys with several diameters were prepared by passing wires of 1 mm of diameter through a drawplate. afterwards, the pt microwire was weared electrochemically in a fused salt mixture (nano3/nacl: 4:1; 320°c) applying a square potential wave (1-50 hz; 2.5 v). microwires of pt-ir and pt-rh alloys were prepared applying a sine-shaped ac potential wave (60 hz, 3-8 v rms), in 6 m nacn + 2 m naoh aqueous solution. the characterization of the interface metal-insulating material and the determination of geometric and effective radii of microelectrodes were carried out by means of optical and scanning electron microscopy, cyclic voltammetry and cronoamperometry. the cd - v plot, where cd is the apparent capacitance corrected by the electrode area and v the scan potential sweep was used to verify the interface metal-glass sealing conditions.
Immobilized lysozyme protein on fibrous medium: Preliminary results for microfiltration applications
Assis,Odilio B. G.; Claro,Luis C;
Electronic Journal of Biotechnology , 2003,
Abstract: the protein lysozyme was deposited onto a permeable support comprising chemically functionalized glass fiber. the main objective of this study was to set a stable organic net with no effect on the medium bed permeability and a preliminary test the activity of this enzyme under immobilized conditions. the film formation is followed by atomic force microscopy (afm) surface imaging. the effect on the bacteria escherichia coli was tested using a simple microfiltration column. the filtration results pointed around 75% removal of bacteria in the effluent when compared to the influent concentration. the removal mechanism is assumed as being essentially due biointeraction. the surface polarity characteristics of the formed film were also considered as playing an important role, suggesting an electrostatic interaction mechanism in the microorganism removal.
Influence of the Testing Gage Length on the Strength, Young's Modulus and Weibull Modulus of Carbon Fibres and Glass Fibres
Pardini, Luiz Claudio;Manhani, Luis Guilherme Borzani;
Materials Research , 2002, DOI: 10.1590/S1516-14392002000400004
Abstract: carbon fibres and glass fibres are reinforcements for advanced composites and the fiber strength is the most influential factor on the strength of the composites. they are essentially brittle and fail with very little reduction in cross section. composites made with these fibres are characterized by a high strength/density ratio and their properties are intrisically related to their microstructure, i.e., amount and orientation of the fibres, surface treatment, among other factors. processing parameters have an important role in the fibre mechanical behaviour (strength and modulus). cracks, voids and impurities in the case of glass fibres and fibrillar misalignments in the case of carbon fibres are created during processing. such inhomogeneities give rise to an appreciable scatter in properties. the most used statistical tool that deals with this characteristic variability in properties is the weibull distribution. the present work investigates the influence of the testing gage length on the strength, young's modulus and weibull modulus of carbon fibres and glass fibres. the young's modulus is calculated by two methods: (i) astm d 3379m, and (ii) interaction between testing equipment/specimen the first method resulted in a young modulus of 183 gpa for carbon fibre, and 76 gpa for glass fibre. the second method gave a young modulus of 250 gpa for carbon fibre and 50 gpa for glass fibre. these differences revelead differences on how the interaction specimen/testing machine can interfere in the young modulus calculations. weibull modulus can be a tool to evaluate the fibre's homogeneity in terms of properties and it is a good quality control parameter during processing. in the range of specimen gage length tested the weibull modulus for carbon fibre is ~ 3.30 and for glass fibres is ~ 5.65, which indicates that for the batch of fibres tested, the glass fibre is more uniform in properties.
Influence of the Testing Gage Length on the Strength, Young's Modulus and Weibull Modulus of Carbon Fibres and Glass Fibres
Pardini Luiz Claudio,Manhani Luis Guilherme Borzani
Materials Research , 2002,
Abstract: Carbon fibres and glass fibres are reinforcements for advanced composites and the fiber strength is the most influential factor on the strength of the composites. They are essentially brittle and fail with very little reduction in cross section. Composites made with these fibres are characterized by a high strength/density ratio and their properties are intrisically related to their microstructure, i.e., amount and orientation of the fibres, surface treatment, among other factors. Processing parameters have an important role in the fibre mechanical behaviour (strength and modulus). Cracks, voids and impurities in the case of glass fibres and fibrillar misalignments in the case of carbon fibres are created during processing. Such inhomogeneities give rise to an appreciable scatter in properties. The most used statistical tool that deals with this characteristic variability in properties is the Weibull distribution. The present work investigates the influence of the testing gage length on the strength, Young's modulus and Weibull modulus of carbon fibres and glass fibres. The Young's modulus is calculated by two methods: (i) ASTM D 3379M, and (ii) interaction between testing equipment/specimen The first method resulted in a Young modulus of 183 GPa for carbon fibre, and 76 GPa for glass fibre. The second method gave a Young modulus of 250 GPa for carbon fibre and 50 GPa for glass fibre. These differences revelead differences on how the interaction specimen/testing machine can interfere in the Young modulus calculations. Weibull modulus can be a tool to evaluate the fibre's homogeneity in terms of properties and it is a good quality control parameter during processing. In the range of specimen gage length tested the Weibull modulus for carbon fibre is ~ 3.30 and for glass fibres is ~ 5.65, which indicates that for the batch of fibres tested, the glass fibre is more uniform in properties.
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