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1
artículo
Publicado 2024
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Mathematics are fundamental in various areas of science, and although teaching it presents challenges, using technology in the classroom offers an opportunity to enhance the learning process, allowing a deeper understanding of concepts and their application in real contexts. In light of this, the current research evaluated the effectiveness of the PhET simulator in teaching the topic of graphing quadratic functions to upper secondary students, aiming to identify the impact of this educational technological tool on their learning. The study was quantitative with a descriptive scope and a pre-experimental design. Prior to the implementation of the treatment, a written questionnaire was applied to students in their fourth semester at Conalep Plantel Tizimín (Yucatan – Mexico), which served to measure their knowledge on the subject under study. After the treatment, the questionnaire was r...
2
artículo
Publicado 2022
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Introduction: Medical education has been affected by social isolation due to the pandemic, and the evaluation of clinical skills in students must opt for options such as clinical simulation. Objective: to describe the evaluation of the degree exam for human medicine interns with multimodal clinical simulation. Clinical evaluation: The structured activity with multimodality from the methodology and location of the participants fulfilled the objective of evaluating and graduating interns. It was carried out through the presentation of case scenarios of two of the major specialties in the intern per student, carried out in a simulation office and a high-fidelity room occupying simulated patients, high-performance simulators, nurse/assistance, function software vital and technical simulation, all of them in person in addition to the student, and the juries remotely who, through observa...
3
artículo
Mathematical modelling applied to batch milling (at experimental level), is a very important tool to simulate and predict the granulometric yield of a given treated ore; this means, for a given duration of milling operation, to obtain an estimate of the corresponding granulometric analysis, which can then be tested with real data later on, to verify the estimates. The model involves the selection and fracture functions depending on each mesh size in the ore distribution. This will allow the prediction of effective and reliable results, saving costs and more importantly, time, without the need to perform the milling process for each prediction of batch milling.
4
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...
5
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%.
6
tesis de grado
Publicado 2022
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Actuators are devices that provides a controlled change in a physical system. They can operate manually, electrically, or by various fluids. Among them, pneumatics actuators have advantages of working with compressible fluids that provides safety and efficient limitations. These are very critical parameters for soft robotics. Rigid actuators are not suitable to substitute muscle functions, hence flexible actuators are appealing. Yet the process to fabricate soft actuators have long iteration until the final product is manufactured and is difficult to design and control due to their natural flexible behavior. 3D printing could be a possible solution. Researchers are exploring feasible solutions with 3D printing material. However, since it’s a new area of research, there is not a large and deep characterization of these materials. This study will focus on the simulation of a hyperelastic...
7
artículo
Publicado 1998
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This study analyzes the mechanisms which cause the increment of viscosities in the residuals of heavy oil during the process of transfer and transport. lt has been determined that the increment is dueto the loss of the viscoreducer which is cause by vaporization. These loss of viscosity is a double logarithmic function of the concentration (expressed in volume) of the viscoreducer. lt is recommended to establish a norm of quality control of residuals to achieve a bener behaviour of the product, determining the temperature of 6% of volume and the viscosities from this cut at 1002F and 210°F.
8
artículo
Publicado 1998
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This study analyzes the mechanisms which cause the increment of viscosities in the residuals of heavy oil during the process of transfer and transport. lt has been determined that the increment is dueto the loss of the viscoreducer which is cause by vaporization. These loss of viscosity is a double logarithmic function of the concentration (expressed in volume) of the viscoreducer. lt is recommended to establish a norm of quality control of residuals to achieve a bener behaviour of the product, determining the temperature of 6% of volume and the viscosities from this cut at 1002F and 210°F.
9
tesis doctoral
Esta tesis doctoral investiga un análisis y simulaciones de plasma frío generado por la técnica de Magnetron Sputtering. Se realiza un estudio diagnóstico del plasma en el laboratorio MatER PUCP utilizando una combinación de Método de Elementos Finitos (FEM), Función de Probabilidad de Energía Electrónica (EEPF), sonda de Langmuir y Espectroscopía de Emisión Óptica (OES). La investigación implica variaciones en la potencia de radiofrecuencia (RF) desde 20 W hasta 90 W, con cambios en la presión desde 6:00 103 mbar hasta 9:00 102 mbar. Notablemente, los datos muestran cambios en este rango de parámetros. Este trabajo explica los parámetros del plasma para cada técnica. Los resultados del FEM muestran que los valores máximos de densidad de iones y electrones son 1:24 1016 m3, y la temperatura electrónica es 4:09 eV a 90 W con 1:00 102 mbar. Los resultados de la sonda de ...
10
artículo
Publicado 2019
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In a normal coagulation / flocculation process, the coagulated / flocculated material is removed by sedimentation. The research proposal is to electrocoagulate and float them (electroflotation); For this, Al+3 and Fe+3 in-situ and oxygen and hydrogen are produced, in order to make this procedure more efficient (electroflotation), a pair of auxiliary electrodes is used, whose sole function is to produce these O2/H2 gases, This way the clots formed by the upper part of the system are removed. The simulated organic load comes from the reduction of the size of species such as proteins / meat, starches / cereals, cellulose / vegetables, fats / oils of vegetable and animal origin. The study was able to reduce turbidity of 1200-1300 NTU to values below 16 NTU and values of 3,400 mgL-1 of COD to values below 500 mgL-1 of COD.
11
artículo
Publicado 2019
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In a normal coagulation / flocculation process, the coagulated / flocculated material is removed by sedimentation. The research proposal is to electrocoagulate and float them (electroflotation); For this, Al+3 and Fe+3 in-situ and oxygen and hydrogen are produced, in order to make this procedure more efficient (electroflotation), a pair of auxiliary electrodes is used, whose sole function is to produce these O2/H2 gases, This way the clots formed by the upper part of the system are removed. The simulated organic load comes from the reduction of the size of species such as proteins / meat, starches / cereals, cellulose / vegetables, fats / oils of vegetable and animal origin. The study was able to reduce turbidity of 1200-1300 NTU to values below 16 NTU and values of 3,400 mgL-1 of COD to values below 500 mgL-1 of COD.
12
artículo
In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...
13
artículo
In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...
14
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...
15
artículo
Publicado 2025
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We evaluate the performance of an Omnivision OV5647 CMOS image sensor (5 Mp) for detecting radiation from Sr90 and Cs137 sources. Our experimental setup uses a Raspberry Pi 3 mini-computer for data acquisition, with image processing using Python and OpenCV libraries. We specify the necessary settings to convert a standard camera into a particle detector sensitive to electrons and photons, including a two-step background filtering procedure. In addition, we implement the first detailed Geant4 simulation that describes the layered geometry and material composition of a commercial CMOS sensor along with the radioactive sources. To enhance the simulation, we include an algorithm for charge diffusion and conversion of the energy deposited by electrons and photons into ADC counts. Our measurements are presented in terms of cluster size, the maximum ADC signal per cluster, and the number of clu...
16
artículo
Publicado 2023
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In order to ensure the Flight Simulator´s functionality, this article exposes the application of the “Design Thinking” Methodology. This will lead to provide more creative and innovative solutions during the Verification and Validation process in the Flight Simulator Software´s Life Cycle. The application of this method in the first stages of the process allows an active and early interaction with user´s needs, increasing the building of solutions and the identification of needs, heighten the final product´s standards. It is important to ensure quality in the software development of flight´s simulators, due to its application is crucial and essential to the air defense of our country. So as to improve the aforementioned process, Design Thinking works with three main scenarios: Ideation, Inspiration and Implementation. The main objective of this article is to integrate these scen...
17
tesis de grado
Publicado 2023
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La inferencia de Redes Neuronales Profundas (o DNNs, por sus siglas en inglés, Deep Neural Networks) se ha vuelto cada vez más demandante en términos de almacenamiento de memoria, complejidad computacional y consumo de energía. Desarrollar hardware especializado en DNNs puede ser un proceso tedioso, que se alarga aún más si se considera el tiempo requerido en escribir software para ello. Así, esta tesis consiste en la validación del acelerador de hardware de redes neuronales NVDLA (por sus siglas en inglés, Nvidia Deep Learning Accelerator) utilizando un ambiente de co-simulación basado en su plataforma híbrida: un CPU implementado como Prototipo Virtual (PV), basado en el Quick Emulator (QEMU), y el modelo de hardware en RTL del NVDLA dentro de un FPGA. Para ello, la arquitectura más portátil del NVDLA nv_small es configurada en el FPGA de una instancia F1 del servicio E2C ...
18
tesis de grado
Publicado 2023
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La inferencia de Redes Neuronales Profundas (o DNNs, por sus siglas en inglés, Deep Neural Networks) se ha vuelto cada vez más demandante en términos de almacenamiento de memoria, complejidad computacional y consumo de energía. Desarrollar hardware especializado en DNNs puede ser un proceso tedioso, que se alarga aún más si se considera el tiempo requerido en escribir software para ello. Así, esta tesis consiste en la validación del acelerador de hardware de redes neuronales NVDLA (por sus siglas en inglés, Nvidia Deep Learning Accelerator) utilizando un ambiente de co-simulación basado en su plataforma híbrida: un CPU implementado como Prototipo Virtual (PV), basado en el Quick Emulator (QEMU), y el modelo de hardware en RTL del NVDLA dentro de un FPGA. Para ello, la arquitectura más portátil del NVDLA nv_small es configurada en el FPGA de una instancia F1 del servicio E2C ...
19
documento de trabajo
Publicado 2017
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RESUMEN Objetivo: Mejorar los procesos y la planeación de recursos con los que opera el proceso de inscripción Ordinaria de la Oficina de Registro Militar 007-A mediante un modelo de simulación acorde con las modernas técnicas de la ingeniería. Materiales y Métodos: Investigación de tipo aplicada, nivel de investigación descriptiva, Diseño en sucesión o en línea llamado Pre-Test, Post-Test, con un solo grupo. Resultados: Comprueban que el modelo propuesto reducirá los tiempos de atención en el proceso de inscripciones en 3.70 % (antes 9.41 min - ahora 5.71 minutos en promedio) con un nivel de Confianza del 95 %, lo cual se alinea con los objetivos del negocio y es una alternativa de solución a problemas existentes en la organización; Con este nuevo modelo se mejoró la productividad del proceso de inscripción en un 86% (antes 114 ciudadanos atendidos – ahora 200 ciudada...
20
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.
