Thermodynamic Properties
Mostrando 49-60 de 356 artigos, teses e dissertações.
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49. Efeitos energético-estruturais em compostos heteropolicíclicos com oxigénio ou enxofre
The present article involves a comparative study of the influence of oxygen or sulfur heteroatoms present in the central ring of polycyclic compounds, in order to clarify the correlation between the respective thermophysical or thermochemical properties and structural characteristics. Considering the importance of these types of compounds for their broad spe
Quím. Nova. Publicado em: 2013
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50. A Theoretical investigation of a potential high energy density compound 3,6,7,8-tetranitro-3,6,7,8-tetraaza-tricyclo[3.1.1.1(2,4)]octane
The B3LYP/6-31G (d) density functional theory (DFT) method was used to study molecular geometry, electronic structure, infrared spectrum (IR) and thermodynamic properties. Heat of formation (HOF) and calculated density were estimated to evaluate detonation properties using Kamlet-Jacobs equations. Thermal stability of 3,6,7,8-tetranitro-3,6,7,8-tetraaza-tric
Quím. Nova. Publicado em: 2013
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51. Representação de mistura de petróleos com abordagem composicional / Representation of petroleum mixture with composicional approach
In recent years, with the increasing complexity of production projects requires that the numerical flow simulators are able to simulate new situations and production scenarios. In the case of convergence points where two or more fluids with different characterizations are mixed and represented by a compositional approach, the numerical representation it beco
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2012
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52. Adsorção de o-xileno em argila fluidgel organofílica em fase gasosa / Adsorption of o-xylene onto organoclay fluidgel in gas phase
The industrial growth allied to use of petroleum products generate numerous volatile organic compounds (VOC) that are continuously emitted to the atmosphere, degrading air quality and causing serious problems to human health and environment. Among the VOC, the so-called BTEX (benzene, toluene, ethyl benzene, and xylene), are the most important in terms of to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2012
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53. Simulação computacional de escoamentos reativos com baixo número Mach aplicando técnicas de refinamento adaptativo de malhas / Computational simulation of low Mach number reacting flows applying adaptive mesh refinement techniques.
It is the main goal of the present work to extend a numerical methodology based on both the use of an adaptive mesh refinement technique (AMR) and the use of a multistep, implicit-explicit time-step strategy (IMEX) to applications involving low Mach number reactive flows. Originally developed for incompressible flows, the Eulerian formulation of that methodo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/06/2012
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54. Efeitos de hibridização correlacionada no modelo de Anderson de uma impureza / Effects of correlated hybridization in the single-impurity Anderson model
O desenvolvimento de novos materiais tem tido papel fundamental nos recentes avanços tecnológicos. Esse progresso depende muito de fundamentos teóricos que abordem mecanismos microscópicos da matéria, ou seja, como átomos e moléculas interagem e geram configurações especiais, responsáveis pelo seu comportamento macroscópico. Dentre os materiais de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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55. APPLICATION OF NANOFLUIDS IN SECONDARY REFRIGERATION SYSTEMS / APLICAÇÃO DE NANOFLUIDOS EM SISTEMAS SECUNDÁRIOS DE REFRIGERAÇÃO
The application of nanofluids as secondary fluids in vapor compression refrigeration systems is studied with the development of a lumped-parameter thermodynamic model. When a nanofluid is used as a heat transfer fluid, its thermal conductivity and viscosity increase, when compared with the corresponding properties of the base fluid. The irreversibilities due
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/05/2012
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56. Aplicação da termodinâmica de processos irreversíveis à análise de secagem e determinação de propriedades térmicas de materiais porosos, por meio de funções de base radial / Irreversible thermodynamic analyses of drying and evaluation of porous media thermal properties through the radial basis functions method
Este trabalho é composto por três seções. As duas últimas seções estão relacionadas à análise do processo de secagem de um grão de trigo. A primeira seção apresentou uma nova técnica numérica para resolver problemas transientes de dispersão de contaminantes em solos não saturados. O esquema numérico serviu como base para resolver as complex
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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57. Biossorventes â biomassa de aguapà e esferas de alginato/goma do cajueiro â para adsorÃÃo de azul de metileno. / BIOSORBENTS - WATER HYACINTH BIOMASS AND SPHERES ALGINATE / CASHEW GUM - FOR ADSORPTION OF METHYLENE BLUE
In this work was carried out an extensive investigation of the adsorption properties of synthetic dyes on different parts (rhizome, root, stolon and petiole) of Eichhornia crassipes (water hyacinth) and a comparison with the adsorption capacity of the biopolymer alginate beads doped with water hyacinth biomass. The biomasses and spheres were structurally cha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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58. Síntese e caracterização de nanocompósitos poliuretano/dióxido de titânio
Due to the demand of the current market of polymeric materials and materials based on a polymeric structure, as some composites and nanocomposites, the development of new materials is fundamental. Thus, this work aims to study the synthesis and experimental characterization of nanocomposites polyurethane/titanium dioxide, using commercial raw materials. The
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/01/2012
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59. Studying transmission of fuel storage bank to NGV cylinder in CNG fast filling station
The exact modeling of the fast-fill process of Compressed Natural Gas (CNG) fueled storage bank occurring to Compressed Natural Gas Vehicle (NGV) cylinders is an unintelligible process, and should be thoroughly studied. In this paper, a theoretical model based on mass balance and thermodynamic laws has been developed to study dynamic fast filling process of
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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60. Analysis of energetically biased transcripts of viruses and transposable elements
RNA interference (RNAi) is a natural endogenous process by which double-stranded RNA molecules trigger potent and specific gene silencing in eukaryotic cells and is characterized by target RNA cleavage. In mammals, small interfering RNAs (siRNAs) are the trigger molecules of choice and constitute a new class of RNA-based antiviral agents. In an efficient RNA
Genet. Mol. Biol.. Publicado em: 13/11/2012