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Article
An automated technique and decision support system for lightning early warning
This paper presents an innovative approach to enhancing lightning early warning systems through a quadrant-based monitoring technique. By segmenting the observation area into quadrants, this study evaluates va...
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Article
A study on mixed electro-osmotic/pressure-driven microchannel flows of a generalised Phan-Thien–Tanner fluid
This work presents new semi-analytical solutions for the combined fully developed electro-osmotic pressure-driven flow in microchannels of viscoelastic fluids, described by the generalised Phan-Thien–Tanner mo...
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Article
Instabilities in micro-contraction flows of semi-dilute CTAB and CPyCl solutions: rheology and flow instabilities
The flows of two semi-dilute surfactant solutions (CTAB and CPyCl) through several micro contractions/expansions are experimentally investigated, following an extensive rheological characterization in both she...
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Article
Simplified method for estimating heat transfer coefficients: constant wall temperature case
This work completes a previous study (Cruz et al., in J Heat Transf 134:091703, 2012) by evaluating the performance of the simplified method proposed therein for calculating the Nusselt number for laminar flow of...
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Article
Pressure-driven electrokinetic slip flows of viscoelastic fluids in hydrophobic microchannels
This work investigates the steady-state slip flow of viscoelastic fluids in hydrophobic two-dimensional microchannels under the combined influence of electro-osmotic and pressure gradient forcings with symmetr...
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Article
Microdevices for extensional rheometry of low viscosity elastic liquids: a review
Extensional flows and the underlying stability/instability mechanisms are of extreme relevance to the efficient operation of inkjet printing, coating processes and drug delivery systems, as well as for the gen...
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Article
Forced convection in electro-osmotic/Poiseuille micro-channel flows of viscoelastic fluids: fully developed flow with imposed wall heat flux
The analytical solution for heat transfer in a dynamic and thermally fully developed channel flow of the simplified Phan-Thien–Tanner fluid induced by combined electro-osmosis and pressure gradient was obtaine...
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Article
Microfluidic systems for the analysis of viscoelastic fluid flow phenomena in porous media
In this study, two microfluidic devices are proposed as simplified 1-D microfluidic analogues of a porous medium. The objectives are twofold: firstly to assess the usefulness of the microchannels to mimic the ...
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Article
Electro-osmotic flow of viscoelastic fluids in microchannels under asymmetric zeta potentials
The flow of viscoelastic fluids between parallel plates under the combined influence of electro-osmotic and pressure gradient forcings with asymmetric boundary conditions, by considering different zeta potenti...
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Article
Viscoelastic flows in mixing-separating cells
The flow of Newtonian and viscoelastic fluids in a mixing-separating geometry that consists of two opposed channel flows interacting through a gap in the common separating wall is investigated. The flow in thi...
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Chapter
Flow of a Blood Analogue Solution Through Microfabricated Hyperbolic Contractions
The flow of a blood analogue solution past a microfabricated hyperbolic contraction followed by an abrupt expansion was investigated experimentally. The shape of the contraction was designed in order to impose...
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Article
Effect of the skimming layer on electro-osmotic—Poiseuille flows of viscoelastic fluids
An analytical solution is derived for the micro-channel flow of viscoelastic fluids by combined electro-osmosis and pressure gradient forcing. The viscoelastic fluid is described by the Phan-Thien–Tanner model...
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Chapter and Conference Paper
Fitting PAC spectra with a hybrid algorithm
A hybrid algorithm (HA) that blends features of genetic algorithms (GA) and simulated annealing (SA) was implemented for simultaneous fits of perturbed angular correlation (PAC) spectra. The main characteristi...
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Article
Fitting PAC spectra with a hybrid algorithm
A hybrid algorithm (HA) that blends features of genetic algorithms (GA) and simulated annealing (SA) was implemented for simultaneous fits of perturbed angular correlation (PAC) spectra. The main characteristi...
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Article
A simple and inexpensive technique to measure molecular diffusion coefficients
The experiment proposed is simple and inexpensive and provides an accurate method for measurement of the molecular diffusion coefficient, D m. It is a novel method that has the added advantage of easily providing...
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Article
Major and trace element characterization of prehistoric ceramic from Rezende archaeological site
Forty one ceramic fragment samples from Rezende archaeological site, Centralina city, Minas Gerais State, Brazil, were analyzed using INAA to determine the concentration of 24 chemical elements: As, Ba, Ce, Co...
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Article
Chemical Characterization by INAA of Brazilian Ceramics and Cultural Implications
Archaeological ceramic fragments from Água Limpa site, in São Paulo, Brazil, were analyzed using instrumental neutron activation analysis. Multivariate statistical methods including Pearson correlation coeffic...
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Chapter
Simulation Study of Coupled Membrane/Pressure Swing Adsorption Processes for VOC Removal from Air
Thin film composite membranes are used to remove organic compounds from air. The coupling of PSA as polishing step has been proposed in a number of cases. This paper deals with steady-state simulation of integ...
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Article
The energy dependence of the leading nucleon distribution and the evolution of the nucleonic cosmic ray component in the atmosphere
We show that in order to obtain a fairly accurate description of the nucleonic component of cosmic ray at sea level the energy dependence of the leading nucleon distribution has to be taken into account. By re...
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Article
Solution of the one-dimensional diffusion equation for the hadronic cosmic-ray component in the atmosphere
We solve the one-dimensional diffusion equation for the hadronic cosmic-ray component in the atmosphere assuming for the interaction mean free path a ln2 E-dependence on the energy and comparing w...
