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A. Escobedo-Morales,U. Pal 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Effect of common optoelectronic dopants like In, Sb and Ga on the structure, morphology and vibrational modes of ZnO nanostructures has been studied systematically using scanning electron microscopy (SEM),X-ray diffraction (XRD), and Raman spectroscopy. While incorporation of Ga has no strong effect on the lattice parameters and crystallinity of ZnO nanostructures, In and Sb doping introduce considerable lattice distortion. Sb doping results an anisotropic distortion along the c axis of the ZnO unit cell. Several anomalous vibrational modes are induced due to incorporation of dopants into ZnO lattice. Origins of the observed anomalous modes are discussed.
YPSZ-LSM interactions in spark plasma sintered ceramics
Claudia A. Cortés-Escobedo 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.4
The objective of the present study is to analyze the interactions between yttria partially stabilized zirconia and strontiumdoped lanthanum manganite (YPSZ-LSM) and lanthanum manganite (LM), after processing by spark plasma sintering. LSM (La1-xSrxMnO3±δ with x = 0.15) and LM (LaMnO3±δ) were obtained by a mechanosynthesis process using two different types of manganese oxide as precursors: MnO (II) and MnO2 (IV). The manganite powders were mixed with YPSZ in a 1:1 weight ratio. The mixed powders were uni-axial compacted at 16 MPa and spark plasma sintered (SPS) at 1000 ο C and 1300 ο C. Results of the interaction between YPSZ and LSM were obtained and are reported from XRD and SEM analyses. For samples that have been sintered at 1000 ο C, only those that contain LM and LSM that has been synthesized from manganese (IV) show the formation of lanthanum zirconate; in contrast, all of the samples that have been sintered at 1300 ο C give raise to lanthanum zirconate. Cubic zirconia is present at room temperature in 15% Sr-doped lanthanum manganite mixtures (1300 ο C SPS).
Personality traits and life experiences influencing highly creative people: Six life stories
Paola Lizcano Madariaga,Pedro Sá,nchez Escobedo 순천향대학교 특수아동교육연구소 2016 특수·영재교육저널 Vol.3 No.1
Throughout qualitative methods this work examines life stories of six highly creative men (puppeteer, social scientist, painter and electrical engineering) and women (dancer & biologist) from both scientific and artistic fields. Salient life events and their own accounts of external and internal influences that they considered crucial in developing their high creative potential were analyzed in order to discern the degree in which experiences, education, personality and genetics combined to explain their highly creative performances. Differences between artistic and scientific creativity were found. Artistic creativity onsets earlier in life in a rather spontaneous fashion, whereas scientific creativity emerges later in life, and it is related to educational experiences. Likewise, scientific personality tended to be more stable over time whereas artistic creative productivity is episodic and rather inspirational. Familiar influences over their actual professional life were explained better by contextual rather than genetic influences, since none of their parents had the same profession. Activities in the family fostered the like and orientation for their work. Challenges and limitations in studying creative personalities are discussed in light of the procedures and results. It is argued that by studying life stories of highly creative people, may yield relevant information on how to foster creativity and understand highly creative individuals.
Modified Green–Lindsay thermoelasticity wave propagation in elastic materials under thermal shocks
Farshad Shakeriaski,Maryam Ghodrat,Juan Escobedo-Diaz,Masud Behnia 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
In this study, a nonlinear numerical method is presented to solve the governing equations of generalized thermoelasticity in a large deformation domain of an elastic medium subjected to thermal shock. The main focus of the study is on the modified Green–Lindsay thermoelasticity theory, solving strain and temperature rate-dependent model using finite strain theory. To warrant the continuity of the finding responses at the boundary after the applied shock, higher order elements are adopted. An analytical solution is provided to validate the numerical findings and an acceptable agreement between the two presented solutions is obtained. The findings revealed that stress and thermal waves have distinct interactions and a harmonic temperature variation may lead to a systematic uniform stress distribution. Besides, a notable difference in the results predicted by the modified Green–Lindsay model and classic theory is observed. It is also found that the modified Green–Lindsay theory is more efficient in determining the wave propagation phenomenon. Furthermore, the findings established that thermal shock induces tensile stresses in the structure immediately after the shock, and the perceived phenomenon mainly depends on the defined boundary conditions. The results show that the strain rate can have a significant influence on the displacement and stress wave propagation in a structure subjected to thermal shock and these impacts may be more considerable with mechanical loading.
Recent advances in generalized thermoelasticity theory and the modified models: a review
Farshad Shakeriaski,Maryam Ghodrat,Juan Escobedo-Diaz,Masud Behnia 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
A review of the recent studies on the generalized thermoelasticity theories and their associated modified models is presented. The aim is to outline an overview of the utilization and physical limitations of available relevant theories. By contrast to classical thermoelasticity theory, generalized thermoelasticity theories (second sound) can involve a hyperbolic-form transport correlation and are motivated by experiments illustrating more accurately of the wave-form heat transfer (second sound). Many researchers have formulated such theories on different fields and analyzed various problems, presenting characteristic properties of these theories. This paper expresses a self-included bibliographical review of previous documents in the area of the second sound. The general structure of this review contains theories, formulations, real limitations, and used solution techniques of the equations for different geometries and loadings. Given that the classical theory is feeble in simulating the temperature distribution, especially in the structures under a sudden thermal shock, this review may be a useful tool for researchers who work in sensitive industries such as steam turbines, micro-temperature sensors, and lithium battery manufacturing.
José Luis Muñoz-Carrillo,José Luis Muñoz-López,José Jesús Muñoz-Escobedo,Claudia Maldonado-Tapia,Oscar Gutiérrez-Coronado,Juan Francisco Contreras-Cordero,María Alejandra Moreno-García 대한기생충학ㆍ열대의학회 2017 The Korean Journal of Parasitology Vol.55 No.6
The immune response against Trichinella spiralis at the intestinal level depends on the CD4+ T cells, which can both suppress or promote the inflammatory response through the synthesis of diverse cytokines. During the intestinal phase, the immune response is mixed (Th1/Th2) with the initial predominance of the Th1 response and the subsequent domination of Th2 response, which favor the development of intestinal pathology. In this context, the glucocorticoids (GC) are the pharmacotherapy for the intestinal inflammatory response in trichinellosis. However, its therapeutic use is limited, since studies have shown that treatment with GC suppresses the host immune system, favoring T. spiralis infection. In the search for novel pharmacological strategies that inhibit the Th1 immune response (proinflammatory) and assist the host against T. spiralis infection, recent studies showed that resiniferatoxin (RTX) had anti-inflammatory activity, which decreased the serum levels of IL-12, INF-γ, IL-1β, TNF-α, NO, and PGE2, as well the number of eosinophils in the blood, associated with decreased intestinal pathology and muscle parasite burden. These researches demonstrate that RTX is capable to inhibit the production of Th1 cytokines, contributing to the defense against T. spiralis infection, which places it as a new potential drug modulator of the immune response.
The Output Regulation Problem for Unmodeled Reference/Disturbance Signals Using High-gain Observers
Jesús Alberto Meda-Campaña,Ricardo Ismael Ancona-Bravo,Jonathan Omega Escobedo-Alva,Tonatiuh Hernández-Cortés,Ricardo Tapia-Herrera 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.4
Based on the regulation theory and high-gain observers, in this paper, a controller for tracking and/or rejecting unmodeled but measurable signals is designed. Considering that the measurable reference/disturbance signals are bounded and smooth, it is proven that the missing dynamical models for such signals can be estimated by high-gain observers of dimensions equal to or greater than one. Then, the corresponding high-gain observers are embedded into an auxiliary system, known as the exosystem, allowing in this way, that the regulation theory can be applied and the new equations to be solved are also given. Because the exosystem is directly constructed from the high-gain observers, the proposed controller is robust in the sense that it is capable of tracking/rejecting any bounded and smooth signal as long as the estimations of the high-gain observers are sufficiently accurate. The existence conditions for such a controller are given, and numerical experiments are used to illustrate the efficacy of the proposed approach.