Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- CO2-derived non-isocyanate urethane based self-etching dental adhesive system(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2025-06-11) Andrade Vivanco, Alex Emilio; Beigiboroujeni, Saeed; emipsanchez; Salinas Salazar, Carmen Lizzeth; Montesinos Castellanos, Alejandro; Bonilla Cruz, José; School of Engineering and Sciences; Campus Monterrey; Yeganeh, HamidThis study reports the synthesis and comprehensive evaluation of a novel maleated self-etch urethane monomer (MAUM) designed to enhance dental adhesive performance. Adhesive formulations containing 0–25 phr MAUM were assessed for polymerization kinetics, mechanical properties, etching efficacy, bonding strength, water sorption, and cytotoxicity. Photo-DSC and FTIR analyses revealed that methacrylate conversion increased from 76% to 89% with MAUM addition, despite a 25% decrease in total polymerization enthalpy, attributed to the maleate groups’ lower reactivity and delayed vitrification from flexible side chains. Mechanical testing showed that fracture toughness improved by up to 40% at 20 phr MAUM, while flexural strength (109–130 MPa) and modulus (2250–2690 MPa) remained statistically unchanged. SEM imaging confirmed ductile fracture surfaces and effective etching of enamel and dentin, facilitating hybrid layer formation. Microshear bond strength (μSBS) increased significantly from 5.68 MPa (5% MAUM) to 15.49 MPa (20% MAUM), matching the commercial adhesive benchmark (15.76 MPa). Water sorption measurements showed a reduction from 30.2 μg/mm³ in the control to 24.5 μg/mm³ in 20 phr MAUM adhesives, indicating improved hydrolytic stability. Cytotoxicity tests with L929 fibroblasts demonstrated >85% cell viability for both 0 phr and 20 phr formulations, surpassing commercial adhesives that often fall below 60% viability. Collectively, these results demonstrate that MAUM enhances polymer network quality, mechanical resilience, adhesive performance, and biocompatibility, while reducing water uptake, supporting its promise for durable and safe dental adhesives.
- Modeling of carbon sequestration and productivity for maize and oats crops using artificial neural network(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-11-25) Aguilar Chavez, Fernanda; Valiente-Banuet, Juan Ignacio; emipsanchez; Clarke Crespo, Emilio; González Viejo, Claudia; School of Engineering and Sciences; Campus QuerétaroClimate change presents a critical challenge to global food security, especially as the global population continues to rise. A major driver of this phenomenon is the accumulation of greenhouse gases, particularly CO₂, which intensifies Earth's warming. Key contributors to elevated CO₂ levels include fossil fuel combustion and agricultural activities. However, agricultural systems have the potential to mitigate this effect by capturing atmospheric CO₂. Notably, few models account for the net CO₂ flux in agricultural systems, which is critical for understanding their true carbon sequestration potential. This study introduces a machine learning-based approach to model CO₂ sequestration and productivity in two forage crops, a variety of maize (Zea mays) and oats (Avena sativa), under diverse environmental conditions. The model leverages critical variables such as degree days, NDVI, and water balance. Using an artificial neural network (ANN), the study achieved robust predictive accuracy for both crops, with determination coefficients (R) of 0.95 for maize and 0.96 for oats, and low mean squared errors (MSE = 0.02). These results highlight the model’s high performance and reliability, offering a valuable tool for predicting carbon sequestration and productivity in forage crops while addressing a key gap in net CO₂ flux modeling.
- Análisis paramétrico del costo-beneficio del diseño de elementos prismáticos de concreto reforzado con criterios durables en exposición a ambientes marinos.(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-11-20) Solís Cruz, David Miguel; Torres Acosta, Andrés Antonio; puemcuervo, emipsanchez; Herrera Sosa, Eduardo Sadot; Rangel Ramírez, José Guadalupe; Escuela de Ingeniería y Ciencias; Campus Querétaro; Crespo Sánchez, Saúl EnriqueLa presente tesis evalúa el comportamiento de dos tipos de cemento (CPO cemento portland ordinario y CPC cemento portland compuesto) de distinto contenido de clinker con respecto a un tiempo de vida largo (80 años), costo económico y emisión de CO2 utilizando la solución de la segunda ley de Fick (ecuación de la función error), através del análisis paramétrico de una sección tipo de 6 metros de largo con sección transversal variable en distintos ambientes marinos (M2, M3, M4). El análisis paramétrico contempla distintos espesores de recubrimiento (25-100mm) y distintas capacidades mecánicas del concreto (25-60MPA) con el propósito de generar un abanico de respuesta y mostrar las distintas tendencias que marcan los datos. Los resultados mostraron que en términos generales el CPO tiene un mejor desempeño que el CPC, sin embargo el CPC con incrementos sustanciales en su resistencia mecánica (mayores 45 MPA) y de recubrimiento (mayores a 50 mm) pueden lograr igualmente un buen desempeño en el ciclo de vida de 80 años.
- Technical and economic evaluation for two process alternatives of CO2 mineralization technology using electric arc furnace slag as raw material(Instituto Tecnológico y de Estudios Superiores de Monterrey) Martínez García, Diana Edith; Montesinos Castellanos, Alejandro; Campus Monterrey; Montesinos Castellanos, AlejandroCarbon dioxide is the major recognized cause of climate change because of its greenhouse properties and continuous accumulation in the atmosphere. It has become attractive for industries that emits great amounts of CO2 emissions to the atmosphere the application of Carbon Dioxide Utilization (CDU) technologies in their processes. In this thesis, technical, economic and environmental aspects are presented to conceptualize two pilot plants that utilize two waste materials, one being the Electric Arc Furnace (EAF) slag produced during steel making and two the CO2 removed in a Direct Reduction (DR) plant to produce either Light Weight Aggregate (LWA) for the construction industry or Precipitated Calcium Carbonate (PCC) for the chemical industry. The objective of the research reported was to evaluate the feasibility for the implementation of the CDU processes in an integrated steelmaking facility which includes a Direct Reduction plant.