Multiscale thermo-hydraulic modeling of cryogenic heat exchangers

The cryogenic industry has experienced a continuous growth in the last decades, partially sustained by the worldwide development of Liquefaction of Natural Gas (LNG) projects. LNG technology provides an economically feasible way of transporting natural gas over long distances, and currently accounts for nearly 30% of the international trade of this resource. The economic feasibility of these projects, in terms of both capital and operating costs, is to a large extent controlled by the performance of the main cryogenic two-phase flow heat exchanger. This industrial scenario provides then the motivation for a detailed study of the heat exchanger from a design perspective. On the one hand, it is widely accepted that a highly detailed analysis is required at a micro scale to properly take account of the two phase heat transfer process. On the other hand, a process-level description corresponds to larger time and space scales. In general, determining the proper methodology for considering these scales and their interaction remains a challenging problem. For this reason, current techniques focus in only one particular scale. The main objective of this project is then to develop a multiscale model applicable for two-phase flow heat exchangers. In this context, a three-scale framework is postulated. This thesis was divided into macro, meso (medium) and micro scale analysis. First, a macroscopic analysis provides a broad description in terms of overall heat transfer and pressure drop, using simple models without taking into account the details of physical phenomena at lower scales. Second, at mesoscale level, flow in parallel channels is considered following a homogenization approach, thus including the effects of flow maldistribution and partial mixing. Third, the microscopic description conceives a phenomenological representation of boiling flows, following multifluid formulations, for two specific flow patterns: annular-mist and post-dryout regimes. Finally, a multiscale design algorithm is proposed.PhD i energi- og prosessteknikkPhD in Energy and Process Engineerin

Data Materialization: A Hybrid Process for Crafting a Teapot

Data materialization is a workflow developed to create 3D objects from data-informed designs. Building upon traditional metalwork and craft, and new technology's data visualization with generative art, this workflow expresses conceptually relevant data through 3D forms which are fabricated in traditional media. The process allows for the subtle application of data in visual art, allowing the aesthetic allure of the art object or installation to inspire intellectual intrigue. This paper describes the technical and creative process of Modern Dowry, a silver-plated 3D-print teapot on view at the Museum of the City of New York, June 2017--June 2018.Museum of the City of New York; Jeannine Falino; the National Science Foundation for supporting the Computing in the Arts workshops (DUE 1323610, DUE 1323605, DUE 1323593); Reiser’s fellow principle investigators (Bill Manaris, Renee McCauley, Jennifer Burg and Rebecca Bruce); Seton Hall University’s Digital Humanities Fellowship Program for funding and support; and Vassar College’s Creative Arts Across Disciplines Program for their summer residency and exceptional collegiality

Liquid metal technology for concentrated solar power systems: Contributions by the German research program

Concentrated solar power (CSP) systems can play a major role as a renewable energy source with the inherent possibility of including a thermal energy storage subsystem for improving the plant dispatchability. Next-generation CSP systems have to provide an increased overall efficiency at reduced specific costs and they will require higher operating temperatures and larger heat flux densities. In that context, liquid metals are proposed as advanced high temperature heat transfer fluids, particularly for central receiver systems. Their main advantages are chemical stability at temperatures up to 900 ℃ and even beyond, as well as largely improved heat transfer when compared to conventional fluids like oil or salt mixtures, primarily due to their superior thermal conductivity. However, major issues here are the corrosion protection of structural materials and the development of technology components and control systems, as well as the development of indirect storage solutions, to circumvent the relatively small heat capacity of liquid metals. On the other hand, using liquid metals might enable alternative technologies like direct thermal-electric conversion or use of solar high-tem­perature heat in chemical processes. This article aims at describing research areas and research needs to be addressed for fully evaluating and subsequently utilizing the potential of liquid metals in CSP systems. A second aim of the article is a brief overview of the liquid metal research capabilities of Karlsruhe Institute of Technology (KIT), their background and their relation to CSP and the aforementioned research pathways

Plan de cuidados para paciente con diabetes mellitus tipo II en atención primaria: estudio de caso.

[Resumen] Introducción: La diabetes mellitus se define como un grupo de alteraciones metabólicas caracterizadas por hiperglucemia debida a un defecto en la secreción de insulina, a un defecto en la acción de la misma, o de ambas. Los síntomas de hiperglucemia son: poliuria, polidipsia, pérdida de peso, polifagia y visión borrosa. La diabetes mellitus se clasifica en tipo I (insulinodependiente) y tipo II (“no dependiente de insulina” o “de inicio en la edad adulta). El tratamiento que constituye fundamentalmente la diabetes tipo I es la administración de insulina y en la diabetes tipo II inicialmente se comienza con dieta, ejercicio y en el caso de no conseguir el control se prescriben antidiabéticos orales. Objetivo: Elaborar un plan de cuidados individualizado para un paciente con Diabetes Mellitus tipo II tras amputación, que permita ofrecer unos cuidados de calidad y seguimiento en la consulta de atención primaria. Desarrollo: La valoración de enfermería se ha realizado de manera presencial empleando el modelo de Virginia Henderson y aplicando las taxonomías enfermeras NANDA, NOC, NIC. Conclusiones: Con la elaboración de este trabajo he podido comprobar la importancia de realizar un plan de cuidados individualizado, para así garantizar la continuidad en los cuidados de un paciente con una determinada patología. Como conclusión, destacar la importancia del papel de la enfermería en el ámbito de la educación sanitaria, ya que, de esta manera se contribuye en el mantenimiento o mejora del estado de salud de la población.[Resumo] Introducción: A diabetes mellitus defínese como un grupo de alteracións metabólicas caracterizadas por hiperglucemia debida a un defecto na secreción de insulina, na acción da mesma, ou de ambas. Os síntomas de hiperglucemia son: poliuria, polidipsia, perda de peso, polifagia e visión borrosa. A diabetes mellitus clasifícase en tipo I (insulinodependente) e tipo II (“non dependente de insulina” ou “de comezo na idade adulta”). O tratamento que constitúe fundamentalmente a diabetes tipo I é a administración de insulina e na diabetes tipo II inicialmente comézase con dieta, exercicio e no caso de non obter o control prescríbense antidiabéticos orais. Obxectivo: Elaborar un plan de coidados individualizado para un paciente con Diabetes Mellitus tipo II tras amputación, que permita ofrecer uns coidados de calidade e seguimento na consulta de atención primaria. Desenvolvemento: A valoración de enfermería realizouse de maneira presencial empregando o modelo de Virginia Henderson e empregando as taxonomías enfermeiras NANDA, NOC e NIC. Conclusións: Coa elaboración de este traballo puiden comprobar a importancia de realizar un plan de coidados individualizado, para así garantir a continuidade e seguimento nos coidados dun paciente con unha determinada patoloxía. Como conclusión, destacar a importancia do papel que desenvolve a enfermaría no ámbito da educación sanitaria, xa que, desta maneira contribúese no mantemento e mellora do estado de saúde da poboación.[Abstract] Introduction: Diabetes mellitus can be defined as a group of metabolic disorders characterized by hyperglycemia due to a defect in the secretion of insulin, a defect in the action of the same, or both. The symptoms of hyperglycemia are: polyuria, polydipsia, weight loss, polyphagia and blurred vision. Diabetes mellitus is classified as type I (insulin-dependent) and type II ("non-insulin-dependent" or "beginning in adulthood).The main treatment used with type I diabetes is the administration of insulin whereas in type II the treatment to follow is: diet, exercise and in the case of not getting control, oral antidiabetic drugs are prescribed. Objective: Develop an individualized care plan for a patient with Type II Diabetes Mellitus after amputation, which allows to offer quality care and follow-up in the primary care consultation. Development: Nursing assessment was done face- to- face applying the Virginia Henderson model and using the NANDA, NOC, NIC taxonomies. Conclusion: With the development of this research I have been able to verify the importance of carrying out an individualized care plan, in order to guarantee continuity and follow-up in the care of a patient with a certain pathology. In conclusion, highlight the importance of the role of nursing in the field of health education since in this ways contributes in the maintenance or improvement the state of health of population.Traballo fin de grao (UDC.ENFC). Enfermaría. Curso 2018/201

Estudio del proceso de extracción de compuestos fenólicos a partir residuos de mazorca maíz

Corn is currently one of the most cultivated cereals in the world, obtaining many agricultural solid residues. Corncob residue can be considered as a subproduct due to the presence of a phenolic fraction rich in flavonoids, which could be used as a substitute of synthetic antioxidant additives for different food and pharmaceutical applications. This work was focused on studying different extraction processes and operating conditions aimed at the recovery of the phenolic fraction from corncob, as well as an identification study in order valorise the final extracts. Experiments were performed by using bath extraction with rotary agitation, ultrasound-assisted extraction, and microwave-assisted extraction. The effects of contact time, temperature (40 and 70ºC) and solvent (ethanol, water, and different ethanol-water mixtures) were also examined. Throughout the work it was possible to verify that with the use of the temperature of 70 ºC better results of extraction of polyphenolic compounds and flavonoids were achieved; Like the ethanol:water mixtures, they are more effective than the use of pure solvents, the 70% mixture being the most effective. Thanks to the extractions in which mixtures are used as solvents, better results were achieved for the percentage of total polyphenolic compounds with respect to the total dry solids. It was verified that by means of the 70% ethanol-water mixture, the reducing capacity of the extract was correlated with the flavonoid fraction, in extraction with ethanol with the polyphenols and if water was used, a very poor correlation was obtained. Regarding the identified compounds, both in the ethanol:water mixtures and in the ethanol the same compounds were identified, although all of them in greater quantity in the mixtures, being the 70% where the most was obtained. In the extraction with water it was also possible to identify gallic acid, p-hydroxybenzoic acid and vanillinic acid. The compound that was identified in the greatest amount was ethyl ferulate, followed by p-coumaric acid, syringic acid and kaempherol. Regarding the extraction techniques, the ultrasound-assisted one turned out to be the most effective, since compared to the agitated bath, it was possible to extract more polyphenolic compounds and flavonoids in less time. With the use of microwaves, extraction results were obtained that were very similar to those obtained by means of a bath, but using only a few minutes of extraction compared to hours in the bath, thus resulting in being more efficient.El maíz es actualmente uno de los cereales más cultivados en el mundo, generándose gran cantidad residuos sólidos que suelen desecharse. En este sentido, la mazorca de maíz es un residuo potencialmente valorizable debido a que presenta en su estructura celulosa, lignina y una fracción fenólica rica en flavonoides, que podrían proporcionar productos con diferente aplicación en el sector químico y alimentario. El objetivo de este trabajo fue estudiar la recuperación de compuestos fenólicos a partir de residuos de mazorca utilizando diferentes técnicas de extracción y condiciones de operación. Se examinó el efecto del disolvente (etanol, agua y mezclas), de la temperatura (40 y 70 ºC), y del tipo contacto (agitación rotatoria, ultrasonidos y microondas) en la cinética de liberación de fenólicos totales y flavonoides a la fase extracto. Se recogen también los resultados del perfil de ácidos fenólicos y flavonoides recuperados bajo las diferentes condiciones de extracción utilizadas

Optimización estructural de fármacos con potencial actividad antiviral para el tratamiento de la influenza tipo A

"En la actualidad el incremento de enfermedades respiratorias causadas por virus es uno de los problemas de salud más retadores para todo el personal del área de la salud a nivel mundial, debido a la fácil transmisión entre la población, es por ello, que el desarrollo de medicamentos para combatir estas enfermedades virales es de vital importancia. Dentro de las enfermedades víricas respiratorias que afectan al ser humano encontramos a la influenza tipo A, la cual es una infección aguda que ataca preferentemente el tracto respiratorio alto y se propaga fácilmente de persona a persona. El virus causante de la influenza presenta una gran variabilidad genética provocando afectación mundial y una carga de morbilidad anual, que ocasionan enfermedades que varían en gravedad. La variabilidad genética presente en este tipo de virus resulta en la generación de resistencia antiviral a través, principalmente de mutaciones en su genoma. En este trabajo de investigación, se pretende utilizar como inicio algunos métodos de la Química Teórica ya existentes para estudiar la interrelación estructura-reactividad-actividad química de una serie de fármacos FDA y analizar su potencial alternativa al tratamiento de la influenza tipo A"

El retratista : comedia en un acto y en verso

Representada en el Teatro del Instituto.Copia digital : Simurg: Fondos digitalizados del CSIC.Copia digital. España : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, d2024Rústica.Mención de editor y serie constan en la cubierta.Registro de la Propiedad Intelectual: Ley de 1847: 4866; n. de solicitud de ingreso: "1343"; fecha y datos de ingreso: "20 Mayo 58", "Regº Nº 480