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Initial concentration profile influence on migration measurements from plastic packaging: A simulation study
(2006-12-01)
Migration of components from plastic packaging into foodstuffs or into medicines is a very important issue, concerning public health. Using experimental techniques, like gas chromatography-mass spectrometry, these essays ...
Estabilização de sistemas fuzzy T-S incertos usando realimenta̧ão derivativa
(2011-05-01)
In some practical problems, for instance, in the suppression of vibration in mechanical systems, the state-derivative signals are easier to obtain than the state signals. Thus, a method for state-derivative feedback design ...
Robust control applications for smart truss structure
(2005-12-01)
A finite element modeling of an intelligent truss structure with piezoelectric stack actuators for the purpose of active damping and structural vibration attenuation is presented. This paper concerns with the following ...
Improving the stability conditions of TS fuzzy systems with fuzzy Lyapunov functions
(2011-12-01)
In this paper, the fuzzy Lyapunov function approach is considered for stabilizing continuous-time Takagi-Sugeno fuzzy systems. Previous linear matrix inequality (LMI) stability conditions are relaxed by exploring further ...
Field data and numerical simulation of btex concentration trends under water table fluctuations: Example of a jet fuel-contaminated site in Brazil
(2017-01-01)
Mass transfer of light non-aqueous phase liquids (LNAPLs) trapped in porous media is a complex phenomenon. Water table fluctuations have been identified as responsible for generating significant variations in the concentration ...
A study on congruency effects and numerical distance in fraction comparison by expert undergraduate students
(Frontiers Media, 2020)
School mathematics comprises a diversity of concepts whose cognitive complexity is still poorly understood, a chief example being fractions. These are typically taught in middle school, but many students fail to master ...
Espacios irresolubles numerables e invariantes cardinales del continuo
(Universidad Michoacana de San Nicolás de Hidalgo. Universidad Nacional Autónoma de México, 2013-08)
A topological space (X, ?) without isolated points is resolvable if there are two disjoint subsets dense, and otherwise is said to be unsolvable. The space of rational numbers is an example of resolvable space. In general, ...
Computational Hydraulics : Numerical Methods and Modelling
Computational Hydraulics introduces the concept of modeling and the contribution of numerical methods and numerical analysis to modeling. It provides a concise and comprehensive description of the basic hydraulic principles, ...
Extreme points of numerical ranges of quasihyponormal operators
(Universidad Nacuional de Colombia; Sociedad Colombiana de matemáticas, 1993)
It is shown that a quasihypnormal operator on a Hilbert space having 0 as a boundary point of its numerical range is hyponormal. A necessary and sufficient condition is given for the extreme points of the numerical range ...
An Efficient Galerkin BEM to Compute High Acoustic Eigenfrequencies
(ASME-AMER SOC MECHANICAL ENG, 2009)
An efficient numerical method, using integral equations, is developed to calculate precisely the acoustic eigenfrequencies and their associated eigenvectors, located in a given high frequency interval. It is currently known ...