The use of digital image correlation for optical monitoring corrosion processes occurring in a metallic sample is here proposed. formation and reduction products (oxides) over the surface an old copper coin immersed electrolytic basic mixture analyzed through standard electrochemical characterization and, simultaneously, registered by means simple experimental setup which corresponding sequential images are registered, stored digitally processed utilizing method. This method may be helpful...

In this work, a conventional surface roughness comparator is used to perform an analysis of different textures. The Hurst exponent method for the characterization optical profiles and speckle digital patterns obtained from was used. By implementation simple experimental setup with minimum alignment, information about specific points on obtained. processing signals images by reflection allowed calculation coefficients, revealing relation between roughness, patterns. simplicity suggest their...

This work presents the assessment of dynamics electrochemical corrosion pure aluminium through Michelsońs optical interferometry measurements. These data were analysed using a new analysis method named Recurrence Plots (RP) analysis. allows pitting process in chloride solution at room temperature. After potentiodynamic polarization curve characterizing system regions was obtained, interferograms for these different (potentials) under potentiostatic control and digitally transformed. The...

In this work an application of digital holographic microscopy as a tool for oxide layer growth monitoring onto copper sample, well determination corrosion products formation rate and type taking place (localized or uniform corrosion) is presented.

En el presente artículo se analizan algunos procedimientos adicionales para la solución de integrales que complementan manera tradicional enseñanza en cálculo integral. Dado contenido los libros solo enfoca ciertos procedimientos, ven plasmados dentro del aula, propone, primer lugar, una ampliación formulario básico integral adicionando las funciones Lambert W y Leal recientemente publicadas. segundo propone guía didáctica por partes. Además, este trabajo presentan método integración...

Fractal dimension is a versatile method to study and evaluate corrosion from the point of view metallic conditions, namely: surface roughness, electrochemical measurements microscopy images. Aluminum corrodes at different rates, under pH electrolytes with or without presence chloride ions. In this work, roughness for aluminum electrolytes: acid, chlorides, neutral basic solutions, were obtained. It was measured obtained using optic techniques. The results Electrochemical Impedance...

This work describes a novel Electrical-Modeling-Based Route Planner (EMBRP) for vehicle guidance within city street networks (maps), which uses an equivalent linear electrical circuit considering traffic flow direction, length, and other physical attributes of the streets as parameters mathematical model branch resistances. Thus, modeling results in system equations, are solved using multifrontal method implemented Unsymmetric Multifrontal Pack (UMFPACK) library. In addition, Modified Local...

In this work we present a numerical study of three-level laser containing polarizable saturable absorber inside the cavity. This model allows us to kinetics solid-state lasers in general form. The stability Q-switching regime is analyzed by means solution rate equations; and main results our analysis let suggest that under certain conditions, may pass from unstable relaxation oscillations stable CW operation changing mutual orientation polarizer, or choosing pump level.

This work presents how performance of a simple Michelson interferometric configuration, allows monitoring oxide layers growing in aluminium structures during preliminary states oxidation processes aqueous solutions, without any physical contact with the sample. The alternative experimental arrangement introduce more alignment compared proposals, and obtained interferograms offer qualitative quantitative interpretation important parameters related to specified corrosion processes. Finally,...

A brief investigation is presented in an electrochemical corrosion cell consisting of 99.5% aluminum sample immersed 3% NaCl and hydrocarbon-chloride solution emulsion, which reaction processes were optically monitored using Michelson interferometry. An image processing method applied on obtained interferograms allowed to calculate oxide layer thickness formed over the metal surface. Additionally a theoretical model two bi-dimensional difference equation system proposed, order explain...

As a governmental function, development for progress and welfare is highly complex process that involves updating various attributes (such as paradigm, critical or alternative, depending on of the way in which they are articulated regarding social aspects, environmental, economic growth, well institutional capacity public private actors). Regarding this, we interested municipal (MIC) skill to carry out functions appropriate tasks municipalities must fulfill an effective, efficient,...

This work proposes the Integral Homotopy Expansive Method (IHEM) in order to find both analytical approximate and exact solutions for linear nonlinear differential equations. The proposal consists of providing a versatile method able provide expressions that adequately describe scientific phenomena considered. In this analysis, it is observed proposed are compact easy evaluate, which ideal practical applications. expresses equation as an integral integrand terms homotopy. As matter fact,...

In this work metal corrosion monitoring by Michelson interferometry and electrochemical polarization curves is presented. Recent advances obtained interferometrical methods, performed as a complementary technique to those of conventional electrochemistry are here highlighted.

The evaluation of efficiency algorithms implemented in a FPGA, which are applied on phase unwrapping and image filtering for holographic interferometry performing, is here presented. A linear algorithm was used holograms obtained by using the phase-shifting method; Fourier Transform Bilateral processes were also 1024x1024 images. Phase operations combined with FPGA 19 times faster than an ARM processor, 12 when instead. Hardware capacities as high-level programming can be alternative to...

It has been recently shown that application of Michelson interferometry, is suitable for monitoring oxide layers growing in metallic structures during preliminary states oxidation processes aqueous solutions, without any physical contact with the sample. The qualitative and quantitative interpretation observed interferograms allows evaluation important parameters related to specific corrosion [1]. Although using aluminum samples surfaces polished certain optical quality a necessary...

In this paper, Recurrence Quantification Analysis (RQA) is set as a practical nonlinear data tool to establish and compare surface roughness (Ra) through percentage parameters of dynamical system: (%REC), Determinism (%DET) Laminarity (%LAM). Variations in different machining procedures from typical metallic casting comparator are obtained scattering intensity laser beam expressed changes the statistics speckle patterns profiles optical properties. The application analysis by Plots (RPs),...