Autonomous University of Aguascalientes

www.uaa.mx
Aguascalientes, Mexico

The Autonomous University of Aguascalientes is a Mexican public university based in the city of Aguascalientes, Aguascalientes, and has several campuses that are located across the state.Its library is named after poet and university president Desiderio Macías Silva, and holds over 183,063 volumes. Wikipedia.

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Rico-Martinez R.,Autonomous University of Aguascalientes | Snell T.W.,Georgia Institute of Technology | Shearer T.L.,Georgia Institute of Technology
Environmental Pollution | Year: 2013

Using the marine rotifer Brachionus plicatilis acute toxicity tests, we estimated the toxicity of Corexit 9500A®, propylene glycol, and Macondo oil. Ratios of 1:10, 1:50 and 1:130 for Corexit 9500A ®:Macondo oil mixture represent: maximum exposure concentrations, recommended ratios for deploying Corexit (1:10-1:50), 1:130 the actual dispersant:oil ratio used in the Deep Water Horizon spill. Corexit 9500A ® and oil are similar in their toxicity. However, when Corexit 9500A® and oil are mixed, toxicity to B. manjavacas increases up to 52-fold. Extrapolating these results to the oil released by the Macondo well, suggests underestimation of increased toxicity from Corexit application. We found small differences in sensitivity among species of the B. plicatilis species complex, likely reflecting phylogenetic similarity. Just 2.6% of the water-accommodated fraction of oil inhibited rotifer cyst hatching by 50%, an ecologically significant result because rotifer cyst in sediments are critical resources for the recolonization of populations each Spring. © 2012 Elsevier Ltd. All rights reserved.


Campos-Esparza M.R.,Autonomous University of Aguascalientes
Central nervous system agents in medicinal chemistry | Year: 2010

Polyphenols are the most abundant antioxidants in diet. These can be found in fruits, vegetables, beverages (tea, wine, juices, etc.), plants and some herbs. These compounds are capable of protecting neuronal cells in different in vivo and in vitro models through diverse intracellular targets. The focus of this review is aimed at presenting the role of some polyphenols on the molecular mechanism involve in neuroprotection through different biological processes like oxidative stress, excitotoxicity, apoptotic neuronal death, regulation of the kinase signal cascade and modulation of Ubiquitin-Proteasome pathway. The study of the molecular mechanisms involved in neuroprotection and the molecular targets of natural polyphenols are important in the discovery of a valuable tool for new and more advanced therapy in neurodegenerative diseases.


Macias-Diaz J.E.,Autonomous University of Aguascalientes
Wave Motion | Year: 2011

The nonlinear processes of supratransmission and infratransmission are employed here in order to show numerically that binary information may be transmitted into (2. +. 1)-dimensional, continuous Frenkel-Kontorova media spatially defined on a square, by perturbing harmonically two adjacent boundaries by means of Neumann conditions. The presence of these nonlinear phenomena is established numerically through a computational method that preserves the positivity of the energy operators, and that consistently approximates the solution of the model, the local energy density, the total energy and its dissipation; the existence of a region of bistability where two regimes coexist (conducting and insulating) is established as a corollary. The transmission of binary information is accomplished by fixing a frequency in the forbidden band-gap of the system, and modulating the amplitude of the signals as the sum of a seed (whose amplitude oscillates sinusoidally between the supratransmission and infratransmission thresholds) and small, positive, constant perturbations associated to nonzero bits. Our simulations show that a reliable transmission of information is indeed feasible. © 2010 Elsevier B.V.


Mora M.,Autonomous University of Aguascalientes
Communications of the Association for Information Systems | Year: 2016

This short paper is a rejoinder to Ivari’s (2016). It describes the Ivari’s arguments, corrective actions, and contributions on the peer-based review system problem in the information systems field. It manifests that, while Ivari’s posited solutions are worthy, they are also insufficient for achieving a behavioral change in the current peer-based review system. However, based on Ivari’s solutions, this short paper presents radical extensions as alternative solutions. Their implementation, however, will rely on the willingness of editorial teams of top and secondary-level journals to promote structural rather than superficial changes to the peer-based review system. © 2016 by the Association for Information Systems.


MacIas-Diaz J.E.,Autonomous University of Aguascalientes
Computer Physics Communications | Year: 2011

Departing from a finite-difference scheme to approximate solutions of a nonlinear, hyperbolic partial differential equation which generalizes the Burgers-Huxley equation from fluid dynamics, we investigate conditions on the model coefficients and the computational parameters under which positive and bounded initial data evolve into positive and bounded new approximations. The model under investigation includes nonlinear coefficients of damping and advection, and the reaction term extends the reaction law of the classical Fisher-Kolmogorov-Petrovsky-Piscounov equation. The method can be expressed in vector form in terms of a multiplicative matrix which, under certain parametric conditions, becomes an M-matrix. Using the fact that every M-matrix is non-singular and that the entries of its inverse are positive, real numbers, we establish sufficient conditions under which the method provides new, positive and bounded approximations from previous, positive and bounded data and boundary conditions. The numerical results confirm the fact that the conditions derived here are sufficient for the positivity and the boundedness of the approximations; moreover, computational experiments evidence the fact that the method still preserves these properties for values of the model and the numerical parameters outside of the analytic regions of positivity and boundedness. We point out that our simulations show a good agreement between the numerical approximations computed through our method and the corresponding, analytical solutions. © 2011 Elsevier B.V.


Macias-Diaz J.E.,Autonomous University of Aguascalientes
International Journal of Modern Physics C | Year: 2011

In the present manuscript, we introduce a finite-difference scheme to approximate solutions of the two-dimensional version of Fisher's equation from population dynamics, which is a model for which the existence of traveling-wave fronts bounded within (0,1) is a well-known fact. The method presented here is a nonstandard technique which, in the linear regime, approximates the solutions of the original model with a consistency of second order in space and first order in time. The theory of M-matrices is employed here in order to elucidate conditions under which the method is able to preserve the positivity and the boundedness of solutions. In fact, our main result establishes relatively flexible conditions under which the preservation of the positivity and the boundedness of new approximations is guaranteed. Some simulations of the propagation of a traveling-wave solution confirm the analytical results derived in this work; moreover, the experiments evince a good agreement between the numerical result and the analytical solutions. © 2011 World Scientific Publishing Company.


Munoz Zavala A.E.,Autonomous University of Aguascalientes
Advances in Intelligent Systems and Computing | Year: 2013

A comparative study is performed to reveal the convergence characteristics and the robustness of three local neighborhoods in the particle swarm optimization algorithm (PSO): ring, Von Neumann and singly-linked ring. In the PSO algorithm, a neighborhood enables different communication paths among its members, and therefore, the way the swarm searches the landscape. Since the neighborhood structure changes the flying pattern of the swarm, convergence and diversity differ from structure to structure. A set of controled experiments is developed to observe the transmission behavior (convergency) of every structure. The comparison results illustrate similarities and differences in the three topologies. A brief discussion is provided to further reveal the reasons which may account for the difference of the three neighborhoods. © Springer-Verlag Berlin Heidelberg 2013.


MacIas-Diaz J.E.,Autonomous University of Aguascalientes
Computer Physics Communications | Year: 2010

In this work, we present a numerical method to consistently approximate solutions of a spatially discrete, double sine-Gordon chain which considers the presence of external damping. In addition to the finite-difference scheme employed to approximate the solution of the difference-differential equations of the model under investigation, our method provides positivity-preserving schemes to approximate the local and the total energy of the system, in such a way that the discrete rate of change of the total energy with respect to time provides a consistent approximation of the corresponding continuous rate of change. Simulations are performed, first of all, to assess the validity of the computational technique against known qualitative solutions of coupled sine-Gordon and coupled double sine-Gordon chains. Secondly, the method is used in the investigation of the phenomenon of nonlinear transmission of energy in double sine-Gordon systems; the qualitative effects of the damping coefficient on the occurrence of the nonlinear process of supratransmission are briefly determined in this work, too. © 2010 Elsevier B.V. All rights reserved.


Sanchez-Cruz H.,Autonomous University of Aguascalientes
Journal of Visual Communication and Image Representation | Year: 2010

Pattern substrings analysis to find high redundancy in binary shapes is carried out to improve compression levels in binary objects. Modifications of a recent set of symbols to encode arbitrary contour shapes is proposed. The concept of Pieces of Discrete Straight Lines is introduced and the probability of appearance of symbols in contours is analyzed to propose a code of nine symbols, MDF9. Also, this code is compared with the six well-known contour codes for compression without loss of information: FCCE, FCCF, VCC, 3OT, DFCCE and C-VCC. The proposed MDF9 code in this paper, gives better compression efficiency than existing codes. © 2010 Elsevier Inc. All rights reserved.


Macias-Diaz J.E.,Autonomous University of Aguascalientes
Communications in Nonlinear Science and Numerical Simulation | Year: 2010

In this work, we present a numerical method to approximate solutions of a continuous β-Fermi-Pasta-Ulam-like medium which, amongst other features, includes the presence of damping and a fourth-order partial derivative, obtained when approximating the continuous limit of the classical β-Fermi-Pasta-Ulam chain. The method includes a discrete energy scheme which consistently approximates the continuous energy formula; moreover, it is shown that the discrete rate of change of energy consistently approximates its continuous counterpart. Computational experiments are conducted in order to show that the method preserves energy in the case of conservative systems, and it loses energy in the case of dissipative media. An application is conducted in order to approximate the occurrence of the process of nonlinear supratransmission in the classical β-Fermi-Pasta-Ulam chain and in discrete sine-Gordon systems, obtaining results which are in good agreement with the theory available in the literature. © 2009 Elsevier B.V. All rights reserved.

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