División de Nanociencias y Materiales: Recent submissions
Now showing items 441-460 of 595
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One-parameter supersymmetric Hamiltonians in momentum space
(2015)"Recent results on the one-parameter supersymmetric deformation in momentum space by Curtright and Zachos (2014 J. Phys. A: Math. and Theor. 47 145201) are presented in a more general framework following our own papers. ... -
Gravitational bouncing of a quantum ball: Room for Airy's function Bi
(2002)"I apply (i) a classical version of the Ermakov-Lewis procedure and (ii) the strictly isospectral supersymmetric approach to the Schrodinger free fall of the bouncing ball type. In both cases, the Airy function Bi, which ... -
Perceptual security of encrypted images based on wavelet scaling analysis
(2016)"The scaling behavior of the pixel fluctuations of encrypted images is evaluated by using the detrended fluctuation analysis based on wavelets, a modern technique that has been successfully used recently for a wide range ... -
Ermakov-Ray-Reid systems with additive noise
(2015)"Using the methods developed by us in Cervantes-López et al. (2014) for multiplicative noises, we present results on the effects of the additive noise on the Ermakov-Lewis invariant. This case can be implemented in the ... -
The Hurst exponents of Nitzschia sp. diatom trajectories observed by light microscopy
(Elsevier, 2015)"We present the results of an experiment with light microscopy performed to capture the trajectories of live Nitzschia sp. diatoms. The time series corresponding to the motility of this kind of cells along ninety-five ... -
Multifractal analyses of row sum signals of elementary cellular automata
(2012)"We first apply the WT-MFDFA, MFDFA, and WTMM multifractal methods to binomial multifrac-tal time series of three different binomial parameters and find that the WTMM method indicates an enhanced difference between the fractal ... -
Shifted one-parameter supersymmetric family of quartic asymmetric double-well potentials
(2014)"Extending our previous work (Rosu, Mancas, Chen, Ann.Phys. 343 (2014) 87-102), we define supersymmetric partner potentials through a particular Riccati solution of the form F(x) = (x − c)2 − 1, where c is a real shift ... -
Scaling analyses based on wavelet transforms for the Talbot effect
(2013)"The fractal properties of the transverse Talbot images are analysed with two well-known scaling methods, the wavelet transform modulus maxima (WTMM) and the wavelet transform multifractal detrended fluctuation anal- ysis ... -
Ermakov systems with multiplicative noise
(2014)"Using the Euler-Maruyama numerical method, we present calculations of the Ermakov-Lewis invariant and the dynamic, geometric, and total phases for several cases of stochastic parametric oscillators, including the simplest ... -
Including transcription factor information in the superparamagnetic clustering of microarray data
(2010)"In this work, we modify the superparamagnetic clustering algorithm (SPC) by adding an extra weight to the interaction formula that considers which genes are regulated by the same transcription factor. With this modified ... -
Application of multifractal wavelet analysis to spontaneous fermentation processes
(Elsevier, 2008)"An algorithm is presented here to get more detailed information, of mixed cul-ture type, based exclusively on the biomass concentration data for fermentation processes. The analysis is performed with only the on-line ... -
Adsorption of molecular gases on porous materials in the SAFT-VR approximation
(2010)"A simple molecular thermodynamic approach is applied to the study of the adsorption of gases of chain molecules on solid surfaces. We use a model based on the Statistical Associating Fluid Theory for Variable Range (SAFT-VR) ... -
Inferring mixed-culture growth from total biomass data in a wavelet approach
(Elsevier, 2006)"It is shown that the presence of mixed-culture growth in batch fermentation processes can be very accurately inferred from total biomass data by means of the wavelet analysis for singularity detection. This is accomplished ... -
Evolution of spherical cavitation bubbles: parametric and closed-form solutions
(2016)"We present an analysis of the Rayleigh-Plesset equation for a three dimensional vacuous bubble in water. In the simplest case when the effects of surface tension are neglected, the known parametric solutions for the radius ... -
A robust estimation of the exponent function in the Gompertz law
(Elsevier, 2006)"The estimation of the solution of a system of two differential equations introduced by Norton et al. (1976) that is equivalent to the famous Gompertz growth law is performed by means of the recent adaptive scheme of ... -
High-gain nonlinear observer for simple genetic regulation process
(Elsevier, 2007)"High-gain nonlinear observers occur in the nonlinear automatic control theory and are in standard usage in chemical engineering processes. We apply such a type of analysis in the context of a very simple one-gene reg-ulation ... -
One-parameter families of supersymmetric isospectral potentials from Riccati solutions in function composition form
(2014)"In the context of supersymmetric quantum mechanics, we define a potential through a particular Riccati solution of the composition form (F ◦ f)(x) = F(f(x)) and obtain a generalized Mielnik construction of one-parameter ... -
Inhomogeneous barotropic FRW cosmologies with constant-shifted conformal hubble parameters
(2013)"It is known that the barotropic FRW system of differential equations for zero cosmological constant can be reduced to simple harmonic oscillator (HO) differential equations in the conformal time variable. This is due to ... -
Nongauge bright soliton of the nonlinear Schrödinger (NLS) equation and a family of generalized NLS equations
(2016)"We present an approach to the bright soliton solution of the nonlinear Schrödinger (NLS) equation from the standpoint of introducing a constant potential term in the equation. We discuss a "nongauge" bright soliton for ... -
Barotropic FRW cosmologies with Chiellini damping in comoving time
(2015)"For nonzero cosmological constant ?, we show that the barotropic FRW cosmologies as worked out in the comoving time lead in the radiation-dominated case to scale factors of identical form as for the Chiellini dissipative ...