Finite Difference Theory
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Analysis of the chemical reactivity of indaziflam herbicide and its metabolites through global and local reactivity descriptors
In the present work, the chemical reactivity of indaziflam N-[(1R,2S)-2,3-dihydro-2,6-dimethyl-1H-inden-1 yl]-6-[(1R)-1-16 fluoroethyl]-1,3,5-triazine-2,4-diamine so called indaziflam (IND) and its metabolites: triazine indanone (ITI), indaziflam carboxylic acid (ICA) and fluoroethyldiaminotriazine (FDAT) was analyzed. The calculations were performed at the
Quím. Nova. Publicado em: 15/08/2019
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2. Vibration behavior of thin-walled steel members subjected to uniform bending
Abstract This article reports the results of an investigation on the effects of internal moments on the vibration behavior of thin-walled steel members. The analyses are based on the Generalized Beam Theory (GBT), a thin-walled bar theory accounting for cross-section in-plane deformations - its main distinctive feature is the representation of the member def
REM, Int. Eng. J.. Publicado em: 2018-07
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3. Numerical solution of the Falkner-Skan equation using third-order and high-order-compact finite difference schemes
We present a computational study of the solution of the Falkner-Skan equation (a thirdorder boundary value problem arising in boundary-layer theory) using high-order and high-order-compact finite differences schemes. There are a number of previously reported solution approaches that adopt a reduced-order system of equations, and numerical methods such as: sh
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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4. On the significance of higher order differential terms in diffusion processes
This paper deals with the analysis of diffusion coupled with temporary retention motivated by the challenge to solve the problem of population spreading. Retention may be associated to colonization of the occupied territory in this case. The discrete approach was selected to deal with this problem due to its relative simplicity and straightforward mathematic
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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5. SNAP OFF OF EMULSION DROPS IN THE FLOW THROUGH A CONSTRICTED CAPILLARY / ANÁLISE DO PROCESSO DE QUEBRA DE GOTA DE EMULSÕES NO ESCOAMENTO ATRAVÉS DE UM CAPILAR COM GARGANTA
The snap off of emulsion drops appears in several industrial activities, including the oil industry. The analysis snap off in a constricted capillary is related to the study of emulsion formation and its characteristics in a porous media. This thesis presents a numerical model based on the conservation equations and lubrification theory developed for Newtoni
Publicado em: 2010
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6. Análise da estabilidade de sistemas de controle analógicos-digitais em função do período de amostragem / Stability analysis of analog-digital control systems as a function of the samplint period
Neste trabalho é analisada a estabilidade de sistemas de controle analógicosdigitais em função do período de amostragem. Uma nova-regra de mapeamento s-z bilinear a dois parâmetros é proposta, testada, analisada e comparada com algumas regras clássicas. Propõe-se um modelo matemático para o falseamento (aliasing). Apresentaram-se Investigações qu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2009
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7. Numerical investigation of the three-dimensional secondary instabilities in the time-developing compressible mixing layer
Mixing layers are present in very different types of physical situations such as atmospheric flows, aerodynamics and combustion. It is, therefore, a well researched subject, but there are aspects that require further studies. Here the instability of two-and three-dimensional perturbations in the compressible mixing layer was investigated by numerical simulat
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-06
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8. Stability analysis of analog-digital control systems as a function of the samplint period / Análise da estabilidade de sistemas de controle analógicos-digitais em função do período de amostragem
In this work the stability of analog-digital control systems as a function of the sampling period is analyzed. A new rule of bilinear s-z mapping with two parameters is proposed, tested, analyzed and compared with some classical rules. A mathematical model for the aliasing is also proposed. Investigations on the stability/instability boundaries of analog-dig
Publicado em: 2009
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9. Análise da estabilidade de sistemas de controle analógicos-digitais em função do período de amostragem / Stability analysis of analog-digital control systems as a function of the samplint period
Neste trabalho é analisada a estabilidade de sistemas de controle analógicosdigitais em função do período de amostragem. Uma nova-regra de mapeamento s-z bilinear a dois parâmetros é proposta, testada, analisada e comparada com algumas regras clássicas. Propõe-se um modelo matemático para o falseamento (aliasing). Apresentaram-se Investigações qu
Publicado em: 2009
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10. Reconstrução de estados de sistemas quanticos compostos e caracterização de emaranhamento por operações locais e comunicação classica / State reconstruction of composite quantum systems and entanglement characterization by local operations and classical communication
We propose a method to obtain properties of composite quantum systems using strictly local measurements and classical communication only. This differs from schemes usually employed in quantum information protocols where global and/or joint local operations are commonly used. Our treatment consists of analysing the effect of measurements of a system over subm
Publicado em: 2009
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11. Rotor-structure interaction : theoretical-experimental model / Interação roto-estrutura : modelo teorico-experimetal
This work investigates the effects of the support structure and the hydrodynamic bearings on the dynamic behaviour of rotating machinery. The support structure, also known as foundation, was analysed experimentally and its modal parameters determined through the modal analysis of its frequency response functions (FRF). These parameters were refined through t
Publicado em: 2007
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12. As equações da onda imagem para remigração em meios elipticamente anisotropicos / The image wave equations for remigration in elliptically anisotropic media
The image-wave equations for the problems of depth and time remigration in elliptically anisotropic media are second-order partial differential equations similar to the acoustic wave equation. The propagation variable is the vertical velocity or the medium ellipticity. These differential equations are derived from the kinematic properties of anisotropic remi
Publicado em: 2007