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1
artículo
Publicado 2019
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Cyanidation (leaching with cyanide) is a common yet complex surface process in hydrometallurgical practice, and its effectiveness in extracting the metal of interest is often affected by the nature of the mineralogical species that are present. Little is known about surface processes on acanthite (a silver sulfide) and how its various facets respond to cyanidation in aqueous solution. Therefore, in this work, some properties of both bulk acanthite (Ag2S) and its (001), (022), and (1̅21) surface facets have been studied by density-functional-theory (DFT)-based calculations to elucidate reactivity trends and competitive adsorption (initial stages in the surface process of cyanidation) between cyanide and other species present in the leaching liquor. It is found that CN– binds by its C-end to silver sites on the acanthite surface with adsorption energy similar to that of OH– but strong...
2
tesis de maestría
Publicado 2019
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This thesis will be oriented in the study of open quantum systems. The transition of processes that go between the Markovian and non-Markovian regime will be studied. The diagnose of non-Markovianity will be made in terms of the variation of the coherence of the state. Accordingly, an optical setup will be implemented that allows us to manipulate certain degrees of freedom, like the polarization and the optical path. Theoretically, we have found that the coherence of the system is transferred to the environment and it decreases as we move a parameter that we will take as time. This situation has been confirmed in the experiment. Then, due to the second part of the setup, which produces a non-Markovian evolution by also changing one of its parameters, we have accomplished the goal of returning the information back into the system and to measure the non-Markovianity of the process.
3
tesis de maestría
This thesis discusses the No-Deleting Theorem in the context of quantum mechanics, and from an informational and thermodynamic point of view. The theorem is proved, and distinction is made between deletion and erasure. Erasure is further discussed through Maxwell’s Demon and Landauer’s principle, which are linked to one another by the Second Law of Thermodynamics. This leads to relate erasure with measurement and work. A setup for deletion simulation is proposed by use of linear optics supplemented by processes such as spontaneous parametric down-conversion. Finally, the No-Deleting Theorem is compared to other No-Go Theorems, and implication relations are proved (demonstrated) between it, the No-Signalling Theorem and the Second Law of Thermodynamics.Termodinámica. Esto conduce a relacionar el concepto de borrado (erasure) con medición y trabajo. Se propone un montaje experimental...
4
objeto de conferencia
We present the simulation of the application of the Model-based Predictive Control (MPC) of the drum level in a Combined Cycle Plant in order to minimize the time for reaching the highest capacity of plant, around 225 MW. In contrast to others control techniques, our simulation yields that the MPC has shown capabilities as to reach its expected power in about 40 minutes before than PID, time which normally takes the whole industrial process under this control. In the present study, we have tested up to three different reference functions in order to compare performance during the drum level control. According to the simulations, the MPC working together with these reference functions is seen to be promising in the sense of providing efficiency to the plant from the startup until the time when system is reaching 225 MW. We have also calculated a minor discrepancy of order of lees than 5%.
5
artículo
Publicado 2020
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Surface passivation is a widely used technique to reduce the recombination losses at the semiconductor surface. The passivating layer performance can be mainly characterized by two parameters: The fixed charge density (Q(ox)) and the interface trap density (D-it) which can be extracted from Capacitance-Voltage measurements (CV). In this paper, simulations of High-Frequency Capacitance-Voltage (HF-CV) curves were developed using simulated passivation parameters in order to examine the reliability of measured results. The D-it was modelled by two different sets of functions: First, the sum of Gaussian functions representing different dangling bond types and exponential tails for strained bonds. Second, a simpler U-shape model represented by the sum of exponential tails and a constant value function was employed. These simulations were validated using experimental measurements of a referenc...
6
artículo
Publicado 2020
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This research work shows the development and implementation of MeViSis. The simulator was designed to support the teaching-learning process of the courses of the Faculty of Civil Engineering, for example, the resistance of materials, structures, seismology, among others. The tool is very important since the simulator allows the student to visually show the effects of an earthquake and the resistance of materials. The simulator was tested by ten students from the last semesters of Civil Engineering, and they are satisfied with the use of the tool.
7
artículo
Publicado 2019
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The performance of discrete element method (DEM) simulations is highly dependent on the requirements of the associated algorithms in terms of computer memory usage and CPU time. In particular, computer CPU time heavily depends on the identification of neighbor particles and the computation of particle-particle interactions. Over the years several neighbor particles searching methods have been developed. Accordingly, in this work the performance of two of well-known searching methods, linked cell and Verlet tables algorithms, are assessed in the context of the development of a new DEM-based tool. More specifically, the neighbor searching methods performance and related computational costs are parametrically analyzed and an assessment of their suitability for carrying the intended numerical simulations is provided. The referred numerical simulations are performed accounting for a canonical...
8
tesis de maestría
Publicado 2019
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I would like to thank the National Council of Science, Technology and Technological Innovation (Concytec) from Peru for the award of a scholarship which made it possible to do this research work.
9
tesis de grado
Publicado 2023
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Se tiene por entendida a la simulación como una herramienta científica que genera diversos contextos a los cuales se puede ver incluida a la empresa, mejorando los cuellos botella de la empresa, tiempo ciclo o costos elevados, con la finalidad de mejorar por ejemplo la productividad, eficiencia o rentabilidad. En base a ello para el presente trabajo de investigación se toma como objeto de estudio a la línea de producción de pollos frescos y limpios de la empresa avícola “Fénix SAC” la cual opera de manera ineficiente debido a que se registran problemas en los puestos de trabajo tanto físicos, como de ruido, iluminación, termomagnético y disergonómico. Para esto se ha buscado realizar propuestas de mejora que conlleven a incrementar la productividad en la empresa mediante la simulación de procesos. Específicamente hablando, se desarrolló un diagnóstico del proceso produ...
10
objeto de conferencia
Publicado 2017
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An interesting application of the prospective technology called Internet of Bio-Nano Things (IoBNT) is in the territory of the medicine. It's expected that this technology plays the role as tool of surveillance of the functionalities of the human organs. To accomplish that, the deployment of nanodevices very near to organs should be a must. However, the idea to deploy nanodevices should be sustained in basis of basic processes, as the ones of physics for instance. In this paper, a physics model based on electrodynamics describing all those processes of anomalous fluxing of albumin in the very beginning of the diabetes kidney disease (DKD), and tested with the assistance of the Monte Carlo method is presented. According to the simulations, signal can be identified in those scenarios where is assumed that the nanosensor has the capabilities to defeat noise or background substantially. For ...
11
objeto de conferencia
Publicado 2018
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El presente trabajo fue desarrollado gracias a la Universidad Nacional de Ingeniería y a los fondos FONDECYT del programa Ciencia Activa (CONCYTEC).
12
tesis de grado
Publicado 2015
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La presente investigación fue elaborada en una empresa del sector aéreo, en donde los analistas de compras a lo largo del año 2014 y los primeros meses del presente año percibieron que existe demora en satisfacer los pedidos de las órdenes de servicio. Esta deficiencia también ha sido reflejada en los reportes de servicios donde se puede apreciar los largos periodos de tiempo en el proceso de adquisición. Por ello se buscan diferentes teorías que puedan ayudar a solucionar este problema. La teoría más adecuada es la teoría de restricciones del físico israelí Eliyahu M., en donde enuncia un proceso que tiene como resultado buscar eliminar las restricciones. En este contexto la tesis tiene como objetivo aplicar las teorías y metodologías, en cual se abordó la problemática. Asimismo se formuló la solución óptima para mejorar el tiempo del proceso de adquisición. This re...
13
tesis de grado
Publicado 2024
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La presente investigación tiene como objetivo incrementar el nivel de servicio con el rediseño del proceso de atención al cliente en la oficina de Chiclayo de una empresa de servicio energético. Para gestionar dicho proceso se subcontrató a otra empresa, y para el 2022, se registró un nivel de servicio del 88,11% en general de clientes atendidos en relación con los clientes que llegan a la oficina, teniendo como meta tener al menos 95%. Se aplicaron herramientas de Lean Service como la teoría de colas para mejorar el proceso de atención, estableciendo una ampliación de servidores de 6 a 7, se propuso un plan de capacitación para que todos los servidores puedan ocuparse de cualquier tipo de atención y refuercen sus competencias, y se propuso el diseño de un sistema de comunicación, un software CRM, para reducir el tiempo de atención; asimismo, para evaluar el comportamiento...
14
tesis de grado
Publicado 2015
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La presente tesis pretende optimizar los recursos en un call center especializado en la evaluación de créditos perteneciente a la empresa GMG servicios del Perú S.A. ubicado en la ciudad de Lima en el distrito de Santiago de Surco, parte de su expansión e incursión en el mercado sudamericano, ingresa al Perú con su marca comercial “El Gallo más Gallo” dedicada a la venta de electrodomésticos, motos, equipos de cómputo y telefonía, entre otros, dirigida fundamentalmente a clientes de ingresos medio-bajos y bajos, además de presentar un crecimiento sostenible en el tiempo. El estudio de caso se centra en analizar la adecuada asignación de recursos del área de call center, así como también la demora de atención a las llamadas entrantes. Una vez conocida la situación actual se diagnosticó que los recursos no eran utilizados de manera adecuada para cumplir de manera ópt...
15
artículo
Publicado 2021
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This work studies the interaction between natural dyes obtained from Peruvian Zea mays and Bixa orellana seeds and nanostructured titanium dioxide, in order to evaluate their function as sensitizers into solar cell devices. The effective attachment of dyes to the TiO2 layer is corroborated by the comparison of UV-Visible absorption and FT-IR spectra of the extracted dye solutions and sensitized TiO2 electrodes. The principal compounds from the seed extraction of Zea mays and Bixa orellana are cyanidin-3-glucoside (C3G) and bixin respectively, which were analyzed in an isolated dye/cluster TiO2 system by molecular dynamic simulation. The results showed that chemisorption is carried out through a consecutive deprotonation process, and Ti-O bond formation by the monodentate OH and COOH anchoring groups, for C3G and bixin respectively. Finally, we tested the effect of the dye - TiO2 interact...
16
tesis de grado
Publicado 2023
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El presente trabajo de investigación ha sido desarrollado en la empresa de Corporación Arellano Perú SAC la cual se dedica a la fabricación y distribución de pegamento para mayólica gris, dentro de su proceso tienen cuellos de botella de 2 y 5 min en las áreas de pesado y mezclado. Lo que no les permite satisfacer con la demanda establecida y a su vez generando pérdidas económicas a la empresa. Por ello se planteó como objetivo general simular el proceso de producción del pegamento gris de para aumentar la productividad, iniciando con un diagnóstico de la situación actual en que se encuentra el área de producción de la empresa Corporación Arellano Perú SAC, donde se propuso mejoras del proceso actual de producción a través del software ProModel y finalmente, se evaluó la productividad del antes y después de los cambios propuestos. La metodología de la presente inves...
17
artículo
Publicado 2024
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Objective: To develop a mathematical model that incorporates the mortality, incidence and prevalence of Mexico’s most common diseases—ulcer, hypertension, type 2 diabetes mellitus and obesity—in order to improve the accuracy of future medication demand predictions. The model utilizes Markov chains, Monte Carlo simulations, econometric methods and financial projections. Materials and methods: A research design was employed using a predictive mathematical model based on econometric and f inancial approaches, such as Markov chains and Monte Carlo simulations. A simulated population of 20,000 individuals was analyzed over 10 simulation cycles in Excel, where individuals transitioned between the healthy, sick and deceased states. The model included previously researched rates of mortality, incidence and prevalence. Results: Transition tables with probabilities, based on Mexico's most co...
18
artículo
Publicado 2021
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Present study comes under the project MAGNET-IGP: Strengthening the research line in physics and microphysics of the atmosphere (Agreement No 010-2017-FONDECYT) This work was done using instruments of the Laboratory of Physics, Microphysics and Radiation (LAMAR) and computational resources, HPC-Linux -Cluster, from Laboratorio de Dinamica de Fluidos Geofisicos Computacionales at Instituto Geofisico del Peru (grants 101-2014-FONDECYT, SPIRALES2012 IRD-IGP, Manglares IGP-IDRC, PP068 program).We also thank Mr. Luis Suarez Salas for the support of LAMAR instruments.
19
artículo
Memory charts like EWMA-S2 or CUSUM-S2 are designed to detect a particular change in the process variance efficiently. However, the charts could be inefficient to detect some other shifts. To overcome this constraint, control charts with adaptive schemes that are efficient for a wide range of shifts can be used. This work proposes new adaptive EWMA charts for the dispersion (AEWMA-S2) based on an adaptive smoothing parameter that relates its value to the potential shift of the process. A Markov chain approach is used to optimize its design. A simulation experiment shows the advantage of the proposed charts. © 2020 Taylor & Francis Group, LLC.
20
artículo
Publicado 2017
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New equipment was designed and developed to evaluate the physical characteristics of animal fibres, based on an automatic digital analysis system (ADAS) that allows the capture of a series of real-time images. In the development of the mechanical component, a design tool was used that allows visualization, simulation, and documentation of the product.
