Pseudoplastic
Mostrando 25-36 de 66 artigos, teses e dissertações.
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25. Preparação e caracterização de suspensões coloidais de nanocarreadores lipídicos contendo resveratrol destinados à administração cutânea
Solid lipid nanoparticles (SLN), nanoemulsions (NE), and microemulsions (ME) were prepared by the hot solvent diffusion method, using tristearin or castor oil as oily phase, and soy lecithin and Solutol HS 15 as surfactants. Mean particle sizes ranged from 20 to 215 nm and negative zeta potentials were obtained for all nanocarriers. A HPLC method used to det
Química Nova. Publicado em: 2011
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26. Escoamento de fluídos pseudoplásticos e viscoplásticos: avaliação analítica e aproximação por elementos finitos / Pseudoplastic and viscoplastic fluids flow: analitic avaliation and finit element aproximation
O presente trabalho objetiva a investigação teórica e numérica da dinâmica dos escoamentos dos fluidos industriais. A grande maioria destes fluidos, ao escoarem apresentam um comportamento reológico bem diverso dos apresentados pelos líquidos Newtonianos - sendo, portanto, conhecidos na literatura como fluidos não-Newtonianos. Neste trabalho são des
Publicado em: 2010
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27. Propriedades reológicas e efeito da adição de sal na viscosidade de exopolissacarídeos produzidos por bactérias do gênero Rhizobium
Viscosity of some polysaccharide solutions supports that these molecules can be applied in food sectors. Four exopolysaccharides (R1, R2, R3, R4) produced by different Rhizobium strains were selected. Sugar composition and differences in the uronic acid contents suggests that chemical structure of these molecules can vary when different culture conditions an
Química Nova. Publicado em: 2010
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28. Caracterização físico-química, reológica e sensorial de iogurte obtido pela mistura dos leites bubalino e caprino
Milk from different animals can be used for dairy production. Yoghurt is a popular fermented milk product and considered to be one of the greatest importance in terms of consumer acceptance and consumption. The present research deals with the production of strawberry set-type yoghurt by mixing goat and buffalos milk and it has the objective of taking advanta
Publicado em: 2010
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29. Secagem de biomassa de levedura (Saccharomyces cerevisiae) em um secador atmosferico condutivo com agitação mecanica : caracterização e avaliação do produto seco como bioadsorvente e complemento nutricional / Drying of yeast biomass (Saccharomyces cerevisiae) in a mechanically shaken conductive atmospheric dryer : characterization and evaluation of the dry material as bioadsorbent and nutritional complement
This thesis allowed evaluating the conductive atmospheric dryer with mechanical agitation, using glass beads as inert particles for drying a residue from brewery (yeast of Saccharomyces cerevisiae species) after being used eight times. The dryer was operated with the sediment load of yeast (150 g and 300 g), heating surface temperature (60 ºC and 90 ºC) an
Publicado em: 2010
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30. Second-law analysis of laminar nonnewtonian gravity-driven liquid film along an inclined heated plate with viscous dissipation effect
A second-law analysis of a gravity-driven film of non-Newtonian fluid along an inclined heated plate is investigated. The flow is assumed to be steady, laminar and fully-developed. The upper surface of the liquid film is considered to be free and adiabatic. The effect of heat generation by viscous dissipation is included. Velocity, temperature and entropy ge
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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31. Forced convection to laminar flow of liquid egg yolk in circular and annular ducts
The steady-state heat transfer in laminar flow of liquid egg yolk - an important pseudoplastic fluid food - in circular and concentric annular ducts was experimentally investigated. The average convection heat transfer coefficients, determined by measuring temperatures before and after heating sections with constant temperatures at the tube wall, were used t
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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32. Desenvolvimento de formulações semi-sólidas contendo anestésicos locais em sistemas nanoparticulados
Objectives: This work aimed to develop and characterize semi-solid formulations containing local anesthetics freely dispersed or entrapped in solid lipid nanoparticles and to evaluate in vivo the analgesic effect of these formulations through tail flick method. Methods: Three semi-solid formulations (gel, cream-gel and silicone emulsion) containing free loca
Publicado em: 2009
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33. Development and characterization of symbiotic quark cheese / Desenvolvimento e caracterização de queijo tipo quark simbiótico
A current food market trend is the consumers’ search for healthier, lowerfat, lower-sugar and more nutritious products. In this context, functional dairy products often added with probiotics and prebiotics stand out among other products of similar nature. Probiotic bacteria are live microorganisms which when consumed in adequate amounts promote health
Publicado em: 2009
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34. Estudo da tenacificação do poliestireno com elastômeros butadiênicos / Polystyrene toughening by butadiene elastomers
This Dissertation describes a study about the toughening of polystyrene with different types of polybutadiene (high-cis, low-cis and styrene - butadiene diblock or triblock copolymers). These materials (High Impact of PolyStyrene HIPS) were performed by melt blending. The mechanical properties (hardness, tensile strength and impact strength); morphology and
Publicado em: 2009
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35. Caracterização fenotípica e produção de biopolímeros por bactérias isoladas de nódulos de guandu [(Cajanus cajan (L.) Millsp.]. 2009, 166f. / Phenotypic characterization and biopolymers production by bacteria isolated from pigeonpea [Cajanus cajan (L.) Millsp.] root nodules. Seropédica: UFRRJ, 2008. 166p.
The biological nitrogen fixation (BNF) is a natural process carried out by prokaryotes collectively called diazotrophs. Among the diverse microorganisms able to fix the atmospheric nitrogen, stand out those capable of set up mutualistic associations with legume plants in specialized structures called nodules. Thus the search for microorganisms able to establ
Publicado em: 2009
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36. Alquilação redutiva da quitosana a partir do glutaraldeído e 3-amino-1-pr / Reductive alkylation of chitosan by glutaraldehyde and 3-amino-1-propanol
Chitosan derivatives were prepared by reductive alkylation using glutaraldehyde and 3-amino-1-propanol. The reducing agent used was the sodium borohydride. Tests of solubility, stability and viscosity were performed in order to evaluate these parameters effects in the reaction conditions (molar ratio of the reactants and presence of nitrogen in the reaction
Publicado em: 2008