Formalism
Mostrando 112 de 365 artigos, teses e dissertações.

1. Dificultades conceptuales y matemáticas del modelo convencional de oscilaciones amortiguadas
Abstract A mathematical study on the subject of damped oscillations is expounded, focused on the computation of the constants of the equation of movement, their mathematical meaning and their implications on the behavior of systems. Examples are given of the initial value method for computing the constants, both for free and damped oscillations. Algebraic ex
Rev. Bras. Ensino Fís.. Publicado em: 06/12/2018

2. Multiscale Failure Analysis of Cylindrical Composite Pressure Vessel: A Parametric Study
Abstract This paper deals with a multiscale approach to model thickwalled laminate cylinder with internal pressure. Micromechanics defines material homogenization considering two steps: determination of equivalent properties of each lamina from matrix and fiber properties according to the MoriTanaka model for elastic properties and to the Bridging model fo
Lat. Am. j. solids struct.. Publicado em: 29/10/2018

3. Adsorción y oxidación de monóxido de carbono en una lamina de ßgrafino: Estudio teórico
ABSTRACT This work presents a study, based on the Density functional theory (DFT), of the adsorption and oxidation of CO on a free platinum catalyst constituted from a sheet of Graphyne. Graphyne is a new allotrope of carbon, its structure is twodimensional and is constituted by a monolayer of carbon atoms with spsp2 hybridization. Depending on the differe
Matéria (Rio J.). Publicado em: 19/07/2018

4. Electrochemical Systems for Renewable Energy Conversion from Salinity and Proton Gradients
Everrising energy demand, fossil fuel dependence, and climate issues have harmful consequences to the society. Exploring clean and renewable energy to diversify the world energy matrix has become an urgent matter. Less explored or unexplored renewable energy sources like the salinity and proton gradient energy are an attractive alternative with great energy
J. Braz. Chem. Soc.. Publicado em: 201805

5. Error variance of short duration sieving
Abstract In this study, the variance of ordinary sieving test error was determined concerning the specification limit of sized iron ore product by subtracting the fundamental error (described by the Gy's formalism for sampling), from the global error (recoverable from database of historical values). The results allowed the calculation of the confidence inter
REM, Int. Eng. J.. Publicado em: 201804

6. Electromagnetism as a world view: implications for the teaching of energy
There are considerable differences in the ways mechanics and electromagnetism conceptualize energy. In the former, energy is defined in terms of force and work in a processlike reasoning that remits us to the ”past” of a given body or system. Moreover, in the mechanical framework energy is ascribed to matter, i.e., one speaks of the energy of a system o
Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017

7. Autocatalysis, Entropic Aspects and the Martensite Transformation Curve in IronBase Alloys
This study advances a methodology that consolidates the description of timedependent (isothermal) as well as timeindependent (athermal) martensitic transformation curves. Our model is applied in an extended 3space, thus permitting inclusion of the effects of autocatalysis on nucleation to be distinguished from the initiation of the transformation, as infl
Mat. Res.. Publicado em: 09/01/2017

8. BIOMASS PYROLYSIS KINETICS: A REVIEW OF MOLECULARSCALE MODELING CONTRIBUTIONS
Abstract Decades of classical research on pyrolysis of lignocellulosic biomass has not yet produced a generalized formalism for design and prediction of reactor performance. Plagued by the limitations of experimental techniques such as thermogravimetric analysis (TGA) and extremely fast heating rates and low residence times to achieve high conversion to usef
Braz. J. Chem. Eng.. Publicado em: 201701

9. Mathematical Description of a Flexible Connection of Links and its Applications in Modeling the Joints of Spatial Linkage Mechanisms
Abstract The general mathematical model of a flexible connection of links by means of springdamping elements is presented in the paper. The formalism of homogeneous transformation matrices is used to derive formulas for the energy of spring deformation and the Rayleigh dissipation function of the springdamping elements. The formulas have convenient forms t
Lat. Am. j. solids struct.. Publicado em: 201612

10. El teorema del Trabajo y la Energía en marcos de referencias rotacionales
In standard textbooks of college physics, Theorem of Work and Energy is generally presented for inertial reference systems in which it is clear that the kinetic energy is conserved when there is not net work of the forces of interaction. But what happens when energy and work are calculated on a noninertial reference frame? In general, in basic physics textb
Rev. Bras. Ensino Fís.. Publicado em: 03/06/2016

11. Extracting Metamaterial Properties of NegativeIndex and Plasmonic scatterers from the Mie Coefficients
Abstract An alternative theoretical approach is presented for improving the understanding of the scattering properties of simple negativeindex and plasmonic spheres. The Mie scattering coefficients are broken up into two terms, the first representing the expected fields of a corresponding positiveindex sphere, the second emerging from the intrinsic metamat
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 201606

12. Inversion Method for Obtaining Electrical Parameters for Soil in the Rural Region in Brazil
AbstractThis paper presents an inversion methodology through weighted least squares to obtain the electrical parameters for the soil of a typical midwestern region in Brazil using the model based in the formalism of the parabolic equations to calculate the electric field intensity received. To validate this methodology, the results of the radio signal measu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 201506