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1
artículo
Publicado 2023
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“The purpose of this study is to numerically investigate the performance of a solar physical surface absorption cooling system, in which activated carbon/methanol is used as a working pair, which is placed inside a parabolic-shaped solar collector. The governing mathematical model of this issue is based on the equations of conservation of mass, conservation of energy, and thermodynamics of the physical surface absorption process. The equations are discretized using the fully implicit finite difference method, and the Fortran computer program was simulated. A comparison with the results of previous laboratory and numerical studies validated this model. At each point in the bed, the temperature, pressure, and mass of the refrigerant absorbed during the physical surface absorption/discharge process were calculated. In addition, the effects of the bed diameter, amount of solar radiation, s...
2
tesis doctoral
Publicado 2021
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Descargue en el texto completo en el repositorio institucional de la Universidade Federal de Santa Catarina: https://repositorio.ufsc.br/handle/123456789/231074
3
artículo
Publicado 2023
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The main subject of this text is the study of analytic second order linear partial differential equations. We aim to solve the classical equations and some more, in the real or complex analytical case. This is done by introducing methods inspired by the method of Frobenius method for second order linear ordinary differential equations. We introduce a notion of Euler type partial differential equation. To such a PDE we associate an indicial conic, which is an affine plane curve of degree two. Then comes the concept of regular singularity and finally convergence theorems, which must necessarily take into account the type of PDE (parabolic, elliptical or hyperbolic) and a nonresonance condition. This condition gives a new geometric interpretation of the original condition between the roots of the original Frobenius theorem for second order ODEs. The interpretation is something like, a certa...
4
artículo
Publicado 2021
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In the present work we give some sufficient conditions to obtain a unique almost automorphic solution to abstract nonlinear integral equations which are simultaneously of advanced and delayed type and also a unique asymptotically almost automorphic mild solution to abstract integro-differential equations with nonlocal initial conditions, both situations are posed on Banach spaces. Also, we develop a Bohr-Neugebauer type result for the abstract integral equations. Before that, we introduce the notion of ?-bounded functions, develop the appropriate abstract theory and discuss the almost periodic situation. As applications, we study the existence of an asymptotically almost automorphic solution to integro-differential equations modeling heat conduction in materials with memory and also the existence of the almost automorphic solution to semilinear parabolic evolution equations with finite d...
5
tesis de grado
Publicado 2017
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A la Universidad Nacional de San Agustín de Arequipa, CIENCIACTIVA y CONCYTEC por el financiamiento de la tesis. Agradecer también a la Universidad Católica San Pablo de Arequipa por brindar los equipos de medición.
6
tesis de grado
Publicado 2024
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Para el desarrollo de este trabajo, en principio, se construye una base de datos que comprende un análisis del grado de letalidad de la pandemia del coronavirus (COVID-19), características y consecuencias de las personas más vulnerables a contagiarse con este virus según los datos recogidos mediante encuestas realizadas con los formularios de Google y procesados a través de técnicas de análisis de datos, como el oversampling para el balanceo de datos, las medidas de tendencia central para su tratamiento y series temporales cuyos indicadores de efectividad están basados en la determinación de los p-valores. Las variables objetivo clasificadas y optimizadas con las técnicas indicadas anteriormente fueron consideradas la edad, el Índice de Masa Corporal (IMC) y la vulnerabilidad a las técnicas imagenológicas; estos resultados también se corroboraron con los datos registra- dos...
7
artículo
Publicado 2021
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The authors acknowledge funding from the Federal Ministry of Education and Research (BMBF) for funding of the Young Investigator Group Perovskite Tandem Solar Cells within the program “Materialforschung für die Energiewende” (grant no. 03SF0540), the Helmholtz Association within the HySPRINT Innovation lab project, and the HyPerCells joint Graduate School. This research was supported by the joint agreement between the DAAD (German Academic Exchange Service) and FONDECYT (National Fund for Scientific, Technological Development and Technological Innovation) under the agreements 57508544 DAAD and 423-2019-FONDECYT. Further support has been provided by the PUCP vice chancellorship for research (VRI, project no. CAP-2019-3-0041/702). The authors thank Thomas Lußky for technical support, Bor Li for part of the sample preparation, and Norbert Koch, David Cahen, Isaac Balberg and Norbert N...
8
artículo
This article is studied the optimal control of distributed parameter systems applied to an environmental pollution problem. The model consists of a differential equation partial parabolic modeling of a pollutant transport in a fluid. The model is considered the speed with which the pollutant spreads in the environment and degradation that suffers the contaminant by the presence of a factor biological inhibitor, which breaks the contaminant at a rate that is not dependent on space and time.Using the method of Lagrange multipliers is possible to prove the existence solving the problem of control and obtaining optimality conditions for optimal control.
9
artículo
This article is studied the optimal control of distributed parameter systems applied to an environmental pollution problem. The model consists of a differential equation partial parabolic modeling of a pollutant transport in a fluid. The model is considered the speed with which the pollutant spreads in the environment and degradation that suffers the contaminant by the presence of a factor biological inhibitor, which breaks the contaminant at a rate that is not dependent on space and time.Using the method of Lagrange multipliers is possible to prove the existence solving the problem of control and obtaining optimality conditions for optimal control.
10
artículo
Publicado 2024
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El presente artículo tiene como objetivo representar las corrientes inducidas por oleaje en las zonas cercanas al puerto de Ilo, con el uso del software SMC y un programa de desarrollo propio en Matlab. En el presente estudio se utilizó para el módulo de oleaje la aproximación parabólica de RefDif, para un modelo de oleaje monocromático. El modelo numérico desarrollado en Matlab permite representar la hidrodinámica de olas y corrientes inducidas basado en las ecuaciones de Navier Stokes y conservación de masa, en forma diferencial con dos dimensiones espaciales (x, y) y una temporal (t). Este modelo se desarrolló tomando en consideración las variables promediadas en el eje vertical z y calado variable, considerando el fenómeno de asomeramiento y refracción que sufren las olas al acercarse a la zona costera de aguas poco profundas. El modelo desarrollado en Matlab se validó ...
11
tesis de maestría
Publicado 2025
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Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Nutrición
