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1
tesis de maestría
Publicado 2016
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Natural vibrissae fulfill a lot of functions. Next to object distance detection and object shape recognition, the surface texture can be determined. Inspired by the natural process of surface texture detection, the goal is to adapt it by technical concepts. Modeling the vibrissa as an EulerBernoulli bending beam and the vibrissa-surface contact with respect to Coulomb's Law of Friction, the first approach is formed by the group of Steigenberger and Behn. Due to the surface contact, the vibrissa gets deformed. Initiating a linear movement of the beam support in the way that the bearn tip gets pushed, first the beam tip is sticking to the surface. The acting friction force prevents a movement of the beam tip until the static friction coeflicient is reached. The displacement of the support corresponds to changes in the acting forces and moment. Out of these changes the coeflicient of stat...
2
tesis de maestría
Publicado 2016
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Natural vibrissae fulfill a lot of functions. Next to object distance detection and object shape recognition, the surface texture can be determined. Inspired by the natural process of surface texture detection, the goal is to adapt it by technical concepts. Modeling the vibrissa as an EulerBernoulli bending beam and the vibrissa-surface contact with respect to Coulomb's Law of Friction, the first approach is formed by the group of Steigenberger and Behn. Due to the surface contact, the vibrissa gets deformed. Initiating a linear movement of the beam support in the way that the bearn tip gets pushed, first the beam tip is sticking to the surface. The acting friction force prevents a movement of the beam tip until the static friction coeflicient is reached. The displacement of the support corresponds to changes in the acting forces and moment. Out of these changes the coeflicient of stat...
3
artículo
Publicado 2024
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Cold joints represent concrete flaws resulting from different pouring times needed to complete a structural unit. The current investigation focuses on examining the reduction in compressive strength of concrete with cold joints at different pouring intervals through the development of an analytical model that describes the effectiveness of the use of two adhesion bridges to bond the new concrete to old concrete. To obtain the necessary data, compressive strength experimentation of concrete specimens with cold joints is carried out. The samples were manufactured under on-site conditions to ensure that the results presented faithfully reflect reality in construction projects in Lima, Peru. Furthermore, ANSYS is used to model the samples, which facilitates a more detailed analysis of their strength, and allows obtaining the friction coefficient of the interface zone as a function of the app...
4
artículo
Publicado 2021
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The purpose of the study was to test the effectiveness of the application of the first and second derivatives to analyze the mathematical functions in future teachers of Mathematics and Physics at UNHEVAL; for this, a cause-effect study and quasi-experimental design was carried out, hoping to optimize the learning of functions in a graphical and analytical way, by means of the exact location of the maximum and minimum points, inflection, determination of the concavity up and down, and others; we worked with a sample of 114 students, of them 73 units of analysis were control and 41 experimental; the data were collected with the written evaluative test, and they were processed obtaining descriptive statistics that allowed to say that the value Z = 7,09 is higher with respect to the critical z = 1,96 at 95% reliability, which allowed to reject the null hypothesis and accept the research hyp...
5
artículo
Publicado 2021
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The purpose of the study was to test the effectiveness of the application of the first and second derivatives to analyze the mathematical functions in future teachers of Mathematics and Physics at UNHEVAL; for this, a cause-effect study and quasi-experimental design was carried out, hoping to optimize the learning of functions in a graphical and analytical way, by means of the exact location of the maximum and minimum points, inflection, determination of the concavity up and down, and others; we worked with a sample of 114 students, of them 73 units of analysis were control and 41 experimental; the data were collected with the written evaluative test, and they were processed obtaining descriptive statistics that allowed to say that the value Z = 7,09 is higher with respect to the critical z = 1,96 at 95% reliability, which allowed to reject the null hypothesis and accept the research hyp...
6
artículo
Publicado 2025
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This study describes the axiological model of the technological package as a pre-patentable foundation of innovation, designed to articulate the value dimensions underpinning validation, transfer, and potential impact on preventive health. A descriptive, non-experimental study with a qualitative–analytical approach was conducted through structured documentary review and hermeneutic content analysis. The results present a systemic model that integrates ethical, technical, and social principles, structuring the innovation process from need identification to product commercialization and maintenance. This framework demonstrates that axiological coherence provides the technical robustness, sustainability, and social relevance required for responsible biotechnological innovation. The study concludes that the axiological foundation enables the transformation of scientific knowledge into pre-...
7
tesis doctoral
Publicado 2023
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El presente trabajo consistió en la formulación de un material restaurador dental a base de nanopartículas de hidroxiapatita (HAp) obtenida de la cáscara de huevo de gallina. Para ello se utilizó el método de mecano-síntesis para la preparación de HAp usando como precursor de calcio a la cáscara de huevo, variando el tiempo de molienda y la temperatura de tratamiento térmico. Se utilizaron las técnicas de DRX, FTIR, MEB, EDS, SPOS y CRM para determinar cuáles fueron las condiciones óptimas de preparación, obteniendo que para 16 horas de molienda y 400 °C de tratamiento térmico la HAp resultante consistía en un material puro con tamaño nanométrico, inclusiones de carbonato y mayor tensión elástica interna. A la par, se realizaron simulaciones computacionales mediante cálculos ab-initio para obtener algunas propiedades físicas de manera teórica en dos tipos de HAp: ...
8
objeto de conferencia
Publicado 2020
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RESUMEN Debido a la limitada cantidad de reservas de petróleo, es fundamental garantizar el uso eficiente de la energía disponible, lo cual está íntimamente ligado al diseño óptimo de los equipos eléctricos. Estos equipos (por funcionar con energía eléctrica) no pueden evitar tener fuentes discretas de generación de calor y su diseño depende de la determinación precisa del campo de temperaturas en todo el cuerpo. En este trabajo se utiliza el método integral de las funciones de Green para determinar la distribución de temperaturas tridimensional de un medio homogéneo debido a una fuente de generación de calor con forma de onda rectangular. La geometría de la generación de calor ha sido seleccionada de tal manera que tenga la forma típica de los calentadores eléctricos flexibles que se encuentran comercialmente disponibles. La solución obtenida es exacta y matemática...
9
tesis de grado
Publicado 2024
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La finalidad de la investigación fue determinar la relación del funcionamiento familiar con la autoestima en gestantes de 18 a 35 años de edad atendidas en el Hospital Regional de Loreto, 2023. Estudio cuantitativo, tipo descriptivo, analítico, diseño no experimental transversal, método hipotético – deductivo, población conformada por 496 gestantes atendidas de 18 a 35 años de edad atendidas en el Hospital Regional de Loreto, con muestreo no probabilístico siendo la muestra 300 gestantes. Se utilizó la encuesta, los instrumentos fueron la escala de funcionamiento familiar FF-SIL de Pérez y la escala de autoestima de Rosenberg. La información se analizó mediante el software SPSS v25, obteniendo los siguientes resultados: Variable funcionamiento familiar, el 93,3% de gestantes presentan un nivel moderadamente funcional, disfuncional en 6% y severamente disfuncional en 7% y ...
10
artículo
Publicado 2014
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Since the experimental obtention of graphenen in 2004, the two dimensional crystalline systems was a study subject of strong analysis from theoretical and experimental point of view. The analytical methods goes from tight binding, Dirac equations for K and K’ points to functional density theories. The present work is an initial study of the electronic structure and the phonon frequencies spectra of 2D crystalline systems using functional density theory. We use the Exciting Fortran 90 code and GPAW Python code. The results of electronic structure for some 2D lattices are shown and also the graphene phonon frequencies spectra.
11
artículo
Publicado 2025
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Generating agricultural suitability analyses that are objective, consistent, and accessible through digital platforms remains a technical and methodological challenge, creating an information gap for certain stakeholders. To address this issue, we assessed the territorial suitability of the Cajamarca region for coffee and cocoa cultivation using 18 subcriteria grouped into climatic, edaphological, topographic, and socioeconomic categories. To reduce subjectivity and improve consistency in variable comparisons, we applied multicriteria evaluation techniques, including the analytical hierarchy process (AHP) and Shannon entropy method. On the basis of the resulting weights, suitability models were generated using two approaches: one based on threshold reclassification and another using continuous suitability functions. Both approaches were validated using 3886 presence points for coffee and...
12
tesis de grado
Publicado 2025
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La enfermedad renal crónica representa un problema de salud pública creciente a nivel mundial, especialmente en países como Perú, donde gran parte de los casos no se diagnostican oportunamente. Los marcadores bioquímicos como glucosa, urea y creatinina son esenciales para evaluar la función renal, pero es fundamental verificar su precisión diagnóstica siguiendo estándares reconocidos. El objetivo de esta investigación fue determinar la precisión diagnóstica de estos marcadores según la guía CLSI EP15-A3 en un laboratorio clínico de Lima. Se aplicó un diseño no experimental, transversal, de tipo descriptivo. La muestra consistió en 150 mediciones (25 réplicas por marcador, en niveles de control normal y patológico, durante cinco días consecutivos). Se evaluaron la precisión (coeficiente de variación), veracidad (sesgo) y desempeño analítico (métrica sigma). Los r...
13
tesis de grado
Publicado 2012
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Esta Tesis. “Aplicación de la función inversa y el método Monte Carlo en la simulación de las operaciones mineras”, si bien las aplicaciones están orientadas a las operaciones mineras, la metodología puede ser usada para la simulación de cualquier proceso industrial, donde la función de distribución de probabilidad no se ajusta a ningún modelo teórico conocido. La metodología planteada es simple y de fácil aplicación para los ingenieros de minas que están en las operaciones mineras. A partir de un contexto experimental traducido en histogramas, se genera valores aleatorios que siguen un comportamiento probabilístico “función de distribución acumulada personalizada” sin tener que pasar por el tedioso trabajo Modelar el histograma, la función acumulada, que es una integral, y de la función inversa de esta última si la solución fuera analítica. Se simplifica a...
14
tesis de grado
Publicado 2015
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The research paper entitled "Impact of Quality Investment Expenditure Budget of the National University of San Martin. Period 2010 - 2014 ", part of the problem What is the impact of investment in the quality of spending of the budget of the National University of San Martin. Period 2010 - 2014? To answer this question has been raised a null hypothesis and alternative hypothesis about non-advocacy and positive, respectively incidence. The overall purpose is precisely to explain this issue. To this effect both variables have been operationalized into dimensions and indicators allowing quantifying their causal relationship. The research is Applied and is given in the Explanatory level, not having used the experimental design of transactional type of functional relationship of cause – effect and methods; analytic - synthetic and deductive - inductive and the application of techniques such...
15
tesis de grado
Publicado 2023
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Determinar si la hipercolesterolemia se encuentra asociada a la alteración de la función renal en pacientes con Enfermedad Renal Crónica en el Hospital de Sullana, Piura – 2023. Materiales y métodos: La investigación se basó en un enfoque no experimental que involucró un proceso de observación y análisis de tipo caso-control, con una población de estudio compuesta por 252 pacientes del Hospital de Apoyo de Sullana. Se recurrió al análisis de fuentes secundarias, específicamente historias clínicas, para recopilar los datos necesarios. En cuanto al análisis estadístico, se llevó a cabo una descripción detallada de los datos y registros encontrados en cada variable utilizando el software SPSS Versión 26. Para evaluar la relación entre las variables de interés, se empleó el método del ““Odds Ratio,““ el cual permite cuantificar la asociación entre la exposic...
16
tesis de grado
Publicado 2020
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Introducción: El deterioro cognitivo describe la alteración en uno o más dominios de la cognición superior/es a lo esperado en una persona de la misma edad. Objetivo: Determinar la relación de los factores asociados de comorbilidad que determinan el deterioro cognitivo del adulto mayor que asisten a consulta médica en el Hospital Regional del Cusco en el periodo de julio septiembre del 2019 Material y métodos: Estudio no experimental, de tipo analítico descriptivo, corte transversal, prospectivo y correlacional, realizado en el Hospital Regional del Cusco durante el periodo julio-septiembre del 2019, en 230 pacientes que cumplieron los criterios de selección. Se realizó una entrevista directa con el paciente para el llenado de datos con la aplicación del test de Montreal y Mini Cog, para la evaluación del deterioro cognitivo, creándose una base de datos y utilizándose para ...
17
artículo
Publicado 2007
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Objective: To determine the effect of glycerol on hydrolisis of p-nitrophenyl phosphate at pH 5,0 by low molecular weight acid phosphatase from alpaca liver. Design: Experimental analytical study. Setting: Biochemistry and Nutrition Research Center, Faculty of Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru. Materials: Disodic p-nitrophenyl phosphate salt, glacial acetic acid, glycerol, tricloroacetic acid, sulfuric acid, ammonium molibdate, ascorbic acid, ammonium sulphate, sephadex G-75 (45-120), sulpho ethyl sephadex C-50 and ethylene diaminotetraacetic (EDTA) chemical reactives. Methods: Both Km and Vmax kinetic parameters were determined with p-nitrophenyl phosphate as substrate in presence of different concentrations of glycerol. The rate of formation of products was determined as a function of the concentration of such nucleophile. Main outcome measures: Glycerol ef...
18
tesis de grado
This investigation was realized by the purpose of analyzing if there is necessary the adoption of legal measures in the predial tax to avoid the prejudice to the verus dominus for duplicity of payments in Peru. In function to it, the following problem of investigation was formulated: there is necessary the adoption of legal measures in the predial tax to avoid the prejudice to the verus dominus for duplicity of payments in Peru?, question that, during the time of investigation, has been confirmed by the hypothesis sustained in the existence of a positive incident in the safeguard of the verus dominus. The investigation is qualitative, of not experimental type and explanatory design Taking form as a sample for 30 juridical materials (Legislation, Jurisprudence, Doctrine, Processes), graphically, virtually and of Web content, the same ones that are considered to author's convenience. The m...
19
artículo
Publicado 2023
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Objectives. To evaluate the association between allergic rhinitis and the degree of pulmonary involvement in patients with COVID-19 and to determine the frequencies of the main variables. Materials and methods. An observational, cross-sectional and analytical study was carried out by reviewing the medical records of patients diagnosed with COVID-19 from the Cayetano Heredia National Hospital between 2020 and 2021. We obtained information regarding the history of allergic rhinitis; pulmonary involvement was assessed by non-contrast tomography results using the chest computed tomography (CT) score. Data regarding sociodemographic and clinical variables was also obtained. Both crude (PR) and adjusted (aPR) prevalence ratios with their respective 95% confidence intervals (CI) were estimated. We also used a generalized linear Poisson family model with log link function and robust variances. R...
20
tesis de grado
Publicado 2023
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After centuries of abandonment of hydraulic management with canals in the Viru basin, there is an academic initiative to investigate the continuity and use of pre-Hispanic canals; The objective of this thesis is to specify the study of irrigation channels in Caray, their functionality and continuity in the Virú valley. The research is basic with a causal correlational non-experimental design, and we worked with two variables, making use of the empirical-analytical scientific method, and the ethnographic method, having as an important tool the direct observation of the architectural evidence, the work of collecting information with the irrigation commission and the population involved in the recovery and use of the canals. The methodology that was applied was divided into field work and office work. The field work was carried out by prospecting and traversing all the channels, making a d...
