Repositorio IPICyT: Envíos recientes
Mostrando ítems 621-640 de 2293
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Estabilización en tiempo finito de sistemas mecánicos: un estudio comparativo y algunos aspectos de robustez
(2019-09-24)"Los algoritmos de control continuos en tiempo finito son frecuentemente motivados en la literatura argumentando ventajas sobre los esquemas asintóticos, tales como mayor robustez ante incertidumbre y perturbaciones. Esto ... -
Factores que influyen en la ocupación de hábitat en la temporada de reproducción del gorrión de Worthen (Spizella wortheni) en el Altiplano Potosino
(2019-09-17)"El Gorrión de Worthen (Spizella wortheni), es una especie endémica y amenazada del Altiplano Mexicano que se asocia a pastizales naturales y matorrales. Su rango de distribución ha disminuido significativamente en los ... -
Modification of porous nickel electrodes with silver nanoparticles for hydrogen production
(Elsevier, 2018)"Silver nanoparticles were electrodeposited into the surface of a macroporous Ni electrode. The developed electrodes were characterized morphologically by confocal laser scanning microscopy and field emission scanning ... -
Desnaturalización térmica de productos de amplificación para genotipificar las especies del complejo Mycobacterium tuberculosis
(2019)"OBJETIVO. Desarrollar un método de qPCR basado en la desnaturalización térmica de amplicones del rDNA 16S y regiones de diferencia (RD1, RD4, RD9) del Complejo Mycobacterium tuberculosis (CMTB). MÉTODOS. Diseñamos parejas ... -
Caracterización del acuífero Río verde, San Luis Potosí con el método magnetotelúrico
(12/09/2019)"En este trabajo de tesis, se realizó la caracterización del sistema acuífero de Rioverde a través del método magnetotelúrico (MT), con el objetivo de conocer la distribución de la resistividad eléctrica a profundidad y ... -
Origin, stratigraphy and evolution of the Oligocene rhyolitic volcanism in the central and southern Mesa Central of Mexico (Villa García, Zacatecas and La Herradura, San Luis Potosí), by means of geochemistry, petrology and geochronology.
(2019-09-19)"The Mesa Central province forms part of the southern Sierra Madre Occidental silicic large igneous province. Oligocene felsic volcanism is common in the center and southern portion of the Mesa Central physiographic province. ... -
High temperature martensitic transformation and giant magnetocaloric effect in Ni40Co10Mn41Sn9 melt-spun ribbons
(Elsevier, 2018)"We report a large magnetic entropy change associated with a high-temperature martensitic transformation in Ni40Co10Mn41Sn9 (at. %) melt-spun ribbons. The ribbons underwent a first-order forward martensitic transition and ... -
Effect of Mg as impurity on the structure of mesoporous γ-Al203: efficiency as catalytic support in HDS of DBT
(Walter de Gruyter GmbH, 2018)"This work shows the study of two alumina materials synthesized from aluminum sulfate with different purity by hydrolysis-precipitation route. The main difference between the aluminum salt precursors was the lower cost of ... -
A class of Piecewise Linear Systems without equilibria with 3-D grid multiscroll chaotic attractors
(IEEE, 2018)"In this paper a new class of piecewise linear (PWL) dynamical system without equilibria which exhibits a three dimensional (3D) grid multiscroll chaotic attractor is presented. The number of scrolls of the attractor ... -
The proteome map of the escamolera ant (Liometopum apiculatum Mayr) larvae reveals immunogenic proteins and several hexamerin proteoforms
(Elsevier, 2018)"The larvae of escamolera ant (Liometopum apiculatum Mayr) have been considered a delicacy since Pre-Hispanic times. The increased demand for this stew has led to massive collection of ant nests. Yet biological aspects of ... -
Impact of emerging, high-production-volume graphene-based materials on the bioavailability of benzo(a)pyrene to brine shrimp and fish liver cells
(Royal Society of Chemistry, 2018)"With increasing commercialization of high volume, two-dimensional carbon nanomaterials comes a greater likelihood of environmental release. In aquatic environments, black carbon binds contaminants like aromatic hydrocarbons, ... -
Graphene oxide triggers mass transfer limitations on the methanogenic activity of an anaerobic consortium with a particulate substrate
(Elsevier, 2018)"Graphene oxide (GO) is an emerging nanomaterial widely used in many manufacturing applications, which is frequently discharged in many industrial effluents eventually reaching biological wastewater treatment systems (WWTS). ... -
Traveling wave solutions for wave equations with two exponential nonlinearities
(Walter de Gruyter GmbH, 2018)"We use a simple method that leads to the integrals involved in obtaining the travelling-wave solutions of wave equations with one and two exponential nonlinearities. When the constant term in the integrand is zero, implicit ... -
Two integrable classes of Emden-Fowler equations with applications in astrophysics and cosmology
(Walter de Gruyter GmbH, 2018)"We show that some Emden–Fowler (EF) equations encountered in astrophysics and cosmology belong to two EF integrable classes of the type d2z/dχ2=Aχ−λ−2zn for λ=(n−1)/2 (class 1), and λ=n+1 (class 2). We find their corresponding ... -
Riccati parametric deformations of the Cornu spiral
(Walter de Gruyter GmbH, 2018)"In this article, a parametric deformation of the Cornu spiral is introduced. The parameter is an integration constant which appears in the general solution of the Riccati equation and is related to the Fresnel integrals. ... -
Comment on demystifying the constancy of the Ermakov-Lewis invariant for a time-dependent oscillator
(World Scientific Publishing Company, 2018)"We show that a simple modification of the Lagrangian proposed by Padmanabhan in the paper [Mod. Phys. Lett. A33, 1830005 (2018)] leads to the most general dynamical invariant in [Ray and Reid, Phys. Lett. A71, 317 (1979)]." -
Eruptive chronology and tectonic context of the late Pleistocene Tres Vírgenes volcanic complex, Baja California Sur (México)
(Elsevier, 2018)"Based on a detailed geological map and stratigraphy aided by new Th-230/U-238 and P-206/U-238 age determinations we established the eruptive chronology of the Tres Virgenes Volcanic Complex (TVVC). The complex consists ... -
Boiling-over dense pyroclastic density currents during the formation of the similar to 100 km(3) Huichapan ignimbrite in Central Mexico: Stratigraphic and lithofacies analysis
(Elsevier, 2018)"A lithofacies analysis of the Huichapan ignimbrite has been undertaken to evaluate its depositional history from large pyroclastic density currents. The Huichapan ignimbrite is a massive ignimbrite sheet with a maximum ... -
Screening of commercial sorbents for the removal of phosphates from water and modeling by molecular simulation
(Elsevier, 2018)"Eight commercial sorbents of different origin and nature were studied in the present work for the removal of phosphate from water using synthetic solutions and a wastewater from an anodizing company. The materials included ... -
Acoustic emission avalanches during compression of granular manganites
(American Institute of Physics, 2018)"We have studied acoustic emission (AE) during compression of La0.8Ca0.28Sr0.08MnO2.7 manganites with different microstructures obtained by selected synthesis techniques. In ceramic samples with large grains obtained by a ...