PERFILOMETRÍA LÁSER DE FORMA LIBRE PARA LA INSPECCIÓN DE TUBERÍAS Y RECONSTRUCCIONES CILÍNDRICAS EN 3D

Mario Montoya (2022, [Tesis de maestría])

"La inspección de infraestructura de tuberías es esencial en la gestión de su integridad para evitar formación de agentes corrosivos y prevenir fracturas. Sin embargo, los métodos actuales están limitados por baja resolución y bajo alcance físico de medición. En este trabajo, se establece un modelo teórico de propagación láser basado en perfilometría láser de forma libre. Además, incorpora un sistema láser totalmente funcional compuesto por un espejo cónico dentro del sistema óptico para recuperar la información de desplazamiento. El dispositivo óptico presenta alta resolución, precisión y velocidad de adquisición en comparación con tecnologías actuales."

Perfilometría Sensores Haz láser Inspección Emisión láser de superficie Tuberías CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA LÁSERES LÁSERES

Uso de sensores remotos para la gestión sustentable de recursos hídricos y seguridad hídrica en zonas agrícolas

WALDO OJEDA BUSTAMANTE RONALD ERNESTO ONTIVEROS CAPURATA JORGE FLORES VELAZQUEZ EDGAR YURI MENDOZA CAZARES MAURO IÑIGUEZ COVARRUBIAS Braulio Robles ALBERTO GONZALEZ SANCHEZ (2017, [Documento de trabajo])

El objetivo del proyecto fue desarrollar y validar metodología usando sensores remotos para mejorar la estimación remota de variables hidroagrícolas, con alta variabilidad espacial y temporal, de importancia para la gestión sustentable de zonas de riego del país usando imágenes de alta resolución espacial y temporal. El trabajo de campo se llevó a cabo en la zona agrícola del distrito de riego 075 Río Fuerte, en el estado de Sinaloa, cubriendo una superficie de 22,000 hectáreas.

Agricultura Sensores remotos Gestión integrada de recursos hídricos Desarrollo sostenible Seguridad hídrica INGENIERÍA Y TECNOLOGÍA

DESIGN AND FABRICATION OF SPECIAL PHOTONIC CRYSTAL FIBERS WITH HIGH COUPLING OF THE FUNDAMENTAL MODE TO LEAKY MODES FOR REFRACTIVE INDEX

Johan Sebastian Buriticá Bolaños (2023, [Tesis de maestría])

"This work explores the possibility of implementing a detection mechanism in optical fibers called “Lossy Mode Resonance” (LMR), which has begun to grow in popularity because, compared to other similar detection mechanisms in the area of optical fibers, has high flexibility with respect to its implementation."

Crystal Fiber sensor Leaky modes LMR CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA FIBRAS ÓPTICAS FIBRAS ÓPTICAS

SISTEMA MECATRÓNICO PARA LA MEDICIÓN DE ÁNGULO DE BREWSTER Y ABELES-BREWSTER

Oscar Silva (2023, [Tesis de maestría])

"Desarrollo de un sistema opto-mecatrónico theta-2theta, el cual realiza mediciones de ángulo de Brewster y Abelès-Brewster para obtener la caracterización de materiales transparentes y películas delgadas dieléctricas."

Índice de refracción Sensor óptico LabVIEW Ángulo de Brewster Técnica de Abelès-Brewster Opto-mecatrónica INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE LA INSTRUMENTACIÓN INSTRUMENTOS ÓPTICOS INSTRUMENTOS ÓPTICOS

Leveraging the self-heating effect of ntc thermistor to detect its minimum coverage by a dispensed paste in the mass production process of temperature sensors

Saúl Alejandro Rodríguez Jiménez LEONOR ADRIANA CARDENAS ROBLEDO (2023, [Artículo])

This paper develops a device capable of confirming the minimum coverage area on a thermistor by a thermal paste dispensed and cured in the manufacturing process of Exhaust Gas Recirculation (EGR) temperature sensors to provide the required fixation in the presence of mechanical shock conditions. Such a device leverages the thermistor’s self-heating effect and the thermal conductivity of the paste to read the voltage drop from the sensor, which translates into paste coverage area. The methodology follows a synthesized procedure to develop equipment and processes, considering an early phase for concept confirmation to demonstrate the feasibility of the device development. In a later phase, the optimal parameters are calculated and set to the device for delivering the corresponding classification of the sensors during the test. Once launched in production, the device demonstrates high effectiveness in screening out the sensors with rejectable paste coverage area on the thermistor.

Self-heating effect Thermistor Paste Temperature sensor Heat dissipation INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

Diseño de riego por melgas empleando las ecuaciones de Saint-Venant, y Green y Ampt

Heber Saucedo MANUEL ZAVALA TREJO CARLOS FUENTES RUIZ (2015, [Artículo])

Se presenta un método de diseño de riego por melgas basado en la aplicación de un modelo que emplea las ecuaciones de Saint-Venant, para describir el flujo del agua sobre el suelo, y la ecuación de Green y Ampt, para representar el flujo del agua en el suelo. La principal ventaja del modelo presentado es el poco tiempo de cómputo que requiere para su aplicación, en comparación con el necesario para ejecutar un modelo hidrodinámico completo reportado en la literatura, mismo que emplea las ecuaciones de Saint-Venant para el flujo del agua sobre el suelo, acopladas internamente con la ecuación de Richards, que permite modelar el flujo del agua en el suelo.

Riego por inundación controlada Modelos matemáticos Gasto óptimo CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Influence of novel coconut oil and beeswax edible coating and MAP on postharvest shelf life and quality attributes of lemon at low temperature

Mohammad Mainuddin Molla Ashfak Ahmed Sabuz Md Abdul Matin (2023, [Artículo])

Weight loss, turning of peel colour from green to yellow and microbial infections are the major postharvest problems of lemon. Lipid-based edible coatings and modified atmospheric packaging (MAP) are effective techniques in maintaining postharvest quality of fruits for long-term storage. With this view, an investigation was conducted for the preservation of green lemon using coconut oil and beeswax edible coating and MAP during storage at low temperature. Physiologically matured lemons were collected and washed with potable water; fruit surface water was removed and then coated with coconut oil-beeswax (90:10) or only coconut oil. After coating, lemons were packaged in MAP or kept in open crates and stored at 12±1 °C and 85±5% relative humidity (RH) for 8 weeks and a week interval, the sampling was conducted. The results revealed that coconut oil-beeswax coating had immense effect on retaining shiny green colour, reducing respiration, weight loss, shrivelling and preserving firmness and ascorbic acid of lemon throughout the storage. On the other hand, MAP mainly helped to retain moisture & firmness and reduce shrivelling. Uncoated lemons kept open lost the highest amount of ascorbic acid and retained only 13.7 mg/100 g that is significantly (p < 0.05) less than the lemons of all other treatments at 8th week of storage period. While lemons coated with coconut oil-beeswax and packaged in MAP was preserved the highest amount (24.2 mg/100 g) of ascorbic acid and there was no significant difference (p < 0.05) with the amount of ascorbic acid content of lemons coated with only coconut oil and packaged in MAP at the last week (8th week) of storage. Hue angle value was 93.4 in uncoated lemons packaged in MAP while it was 113.67 in coconut oil-beeswax coated lemon kept open and 112.64 in lemon coated with coconut oil-beeswax and packaged in MAP at 8th week of storage. Based on all sensory, physical and chemical parameters uncoated lemons kept open was acceptable up to 1 week, coconut oil-beeswax coated lemon kept open was 6 weeks and coconut oil-beeswax coated lemon packaged in MAP was 8 weeks with good quality and shiny green colour.

Edible Coating Sensory Quality Hue Angle Yellowing CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA EDIBLE FILMS RESPIRATION RATE LEMONS MODIFIED ATMOSPHERE PACKAGING COLD

Agroecology can promote climate change adaptation outcomes without compromising yield in smallholder systems

Sieglinde Snapp Yodit Kebede Eva Wollenberg (2023, [Artículo])

A critical question is whether agroecology can promote climate change mitigation and adaptation outcomes without compromising food security. We assessed the outcomes of smallholder agricultural systems and practices in low- and middle-income countries (LMICs) against 35 mitigation, adaptation, and yield indicators by reviewing 50 articles with 77 cases of agroecological treatments relative to a baseline of conventional practices. Crop yields were higher for 63% of cases reporting yields. Crop diversity, income diversity, net income, reduced income variability, nutrient regulation, and reduced pest infestation, indicators of adaptative capacity, were associated with 70% or more of cases. Limited information on climate change mitigation, such as greenhouse gas emissions and carbon sequestration impacts, was available. Overall, the evidence indicates that use of organic nutrient sources, diversifying systems with legumes and integrated pest management lead to climate change adaptation in multiple contexts. Landscape mosaics, biological control (e.g., enhancement of beneficial organisms) and field sanitation measures do not yet have sufficient evidence based on this review. Widespread adoption of agroecological practices and system transformations shows promise to contribute to climate change services and food security in LMICs. Gaps in adaptation and mitigation strategies and areas for policy and research interventions are finally discussed.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CLIMATE CHANGE CROPS FOOD SUPPLY GAS EMISSIONS GREENHOUSE GASES FARMING SYSTEMS AGROECOLOGY FOOD SECURITY LESS FAVOURED AREAS SMALLHOLDERS YIELDS NUTRIENTS BIOLOGICAL PEST CONTROL CARBON SEQUESTRATION LEGUMES

Oportunidad de aplicación de la metodología FRONT END LOADING en la expansión de gasoductos en el sureste mexicano: una evaluación

Opportunity to apply the front end loading methodology in the expansion of gas pipelines in the mexican southeast: an evaluation

Raúl Enrique Trejo Alvarado Luis Rolando Méndez Miguel (2023, [Artículo])

Con la finalidad de impulsar el desarrollo de la región sureste de México, la actual administración del gobierno federal se ha propuesto la ampliación de la red nacional de gasoductos hacia esa zona del país, con el fin de suministrar energía a los megaproyectos de la región. No obstante, estas obras presentan actualmente retrasos, evidenciando la necesidad de metodologías de gestión que permitan solucionar este problema de raíz. Una de las metodologías más prometedoras en esta materia es la front-end loading (FEL), ampliamente aplicada en el sector extractivo y energético. El propósito del articulo estriba en evaluar la posibilidad de aplicar la metodología FEL a los proyectos de expansión del Sistema Nacional de Gasoductos en el sureste mexicano.

To boost the development of the southeast region of Mexico, the current federal government administration has proposed the expansion of the national gas pipeline network to this area of the country, to supply energy to the region's mega-projects. However, these projects are currently experiencing delays, demonstrating the need for management methodologies to solve this problem at its root. One of the most promising methodologies in this area is front-end loading (FEL), which has been widely applied in the extractive and energy sector. The aim of this paper is to evaluate the possibility of applying the FEL methodology to the expansion projects of the National Gas Pipeline System in the southeastern México.

Gas natural Sector energético Front end loading (FEL) Evaluación de proyectos Sureste mexicano Natural gas Energy sector Project evaluation Mexican southeast INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

The fate of rice crop residues and context-dependent greenhouse gas emissions: Model-based insights from Eastern India

Sonam Sherpa virender kumar Andrew Mcdonald (2024, [Artículo])

Crop residue burning is a common practice in many parts of the world that causes air pollution and greenhouse gas (GHG) emissions. Regenerative practices that return residues to the soil offer a ‘no burn’ pathway for addressing air pollution while building soil organic carbon (SOC). Nevertheless, GHG emissions in rice-based agricultural systems are complex and difficult to anticipate, particularly in production contexts with highly variable hydrologic conditions. Here we predict long-term net GHG fluxes for four rice residue management strategies in the context of rice-wheat cropping systems in Eastern India: burning, soil incorporation, livestock fodder, and biochar. Estimations were based on a combination of Tier 1, 2, and 3 modelling approaches, including 100-year DNDC simulations across three representative soil hydrologic categories (i.e., dry, median, and wet). Overall, residue burning resulted in total direct GHG fluxes of 2.5, 6.1, and 8.7 Mg CO2-e in the dry, median, and wet hydrologic categories, respectively. Relative to emissions from burning (positive values indicate an increase) for the same dry to wet hydrologic categories, soil incorporation resulted in a −0.2, 1.8, or 3.1 Mg CO2-e change in emissions whereas use of residues for livestock fodder increased emissions by 2.0, 2.1, or 2.3 Mg CO2-e. Biochar reduced emissions relative to burning by 2.9 Mg CO2-e in all hydrologic categories. This study showed that the production environment has a controlling effect on methane and, therefore, net GHG balance. For example, wetter sites had 2.8–4.0 times greater CH4 emissions, on average, than dry sites when rice residues were returned to the soil. To effectively mitigate burning without undermining climate change mitigation goals, our results suggest that geographically-target approaches should be used in the rice-based systems of Eastern India to incentivize the adoption of regenerative ‘no burn’ residue management practices.

Soil Carbon Rice Residue Burning Life Cycle Assessment CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA SOIL CARBON RICE LIFE CYCLE GREENHOUSE GASES CLIMATE CHANGE