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Dissertations / Theses on the topic 'Research Subject Categories – TECHNOLOGY – Engineering physics'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Asarisi, Vincenzo. "Sintesi e caratterizzazione di polieterisolfoni solfanati." Thesis, Università degli Studi di Catania, 2011. http://hdl.handle.net/10761/203.

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Lo scopo del lavoro sperimentale della presente tesi di Dottorato e' stato focalizzato allo studio della reazione di sintesi di un'innovativa classe di tecnopolimeri a base aromatica aventi una struttura parzialmente polare; i poli(arilen eteri-solfoni) (PES). Tale studio sperimentale avra' l'obiettivo, a partire dai dati di letteratura e dall'esperienza maturata dal gruppo di ricerca nel settore, di studiare la cinetica della reazione di policondensazione, e partendo dai risultati di tale studio riuscire a mettere a punto un metodo innovativo di sintesi per questa classe di macromolecole,

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2

Reyes, Ponse Diego Armando. "Implantación de la Norma NOM-011-STPS-2001 en el Taller de Diseño y Desarrollo de Prototipos del Centro Universitario UAEM Valle de México para Integrarlo al programa de Autogestión en Seguridad y salud en el trabajo de la Secretaría del Trabajo y Previsión Social." Tesis de Licenciatura, Universidad Autonoma del estado de México, 2016. http://hdl.handle.net/20.500.11799/80298.

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Implantación de la Norma NOM-011-STPS-2001 en el Taller de Diseño y Desarrollo de Prototipos del Centro Universitario UAEM Valle de México para Integrarlo al programa de Autogestión en Seguridad y salud en el trabajo de la Secretaría del Trabajo y Previsión Social<br>El presente trabajo escrito presenta la propuesta para la implantación de la Norma NOM-011-STPS-2001, condiciones de seguridad e higiene en los centros de trabajo donde se genere ruido en el Taller de Diseño y Desarrollo de Prototipos del Centro Universitario UAEM Valle de México para integrarlo al Programa de Autogestión en Segur

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3

Figueroa, Martínez Omar. "Manufactura De Procesamiento de Materiales Avanzados CERMETS Base Alúmina Reforzados con Parículas de Plata." Tesis de Licenciatura, Universidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80301.

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MANUFACTURA Y PROCESAMIENTO DE MATERIALES AVANZADOS CERMETS BASE ALÚMINA REFORZADOS CON PARTICULAS DE PLATA<br>En esta investigación se realizó el estudio de un material cerámico avanzado, este material compuesto está formado por el sistema cerámico-metal también denominado CERMET. El sistema de estudio en particular está formado por alúmina-plata, el material cerámico y el material metálico utilizado en este sistema son alúmina (Al2O3) comercial en polvo de la marca Reasol con una pureza de 99.2% y plata (Ag) comercial en polvo de la marca Meyer con una pureza del 99.99%. La composici

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4

Silva, Pérez Edgar Valéntin. "PLANEACIÓN DE MATERIALES PARA LAS REVISTAS TV y NOVELAS Y VANIDADES DE EDITORIAL TELEVISA." Tesis de Licenciatura, UNiversidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80306.

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PLANEACIÓN DE MATERIALES PARA LAS REVISTAS TV y NOVELAS Y VANIDADES DE EDITORIAL TELEVISA<br>El presente reporte desarrolla la planeación de materiales para imprimir dos revistas de Editorial TELEVISA, las cuales son líderes en ventas. TV y Novelas, revista dirigida al gran sector de público televidente, que quiere enterarse de lo que pasa en la vida de la farándula y el medio del espectáculo. VANIDADES, revista dirigida a las mujeres que quieren enterarse de la vida de las celebridades alrededor del mundo y que gustan de las últimas tendencias de la moda y belleza, es conservadora sin llega

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5

Peña, Ortiz Alejandra Pamela. "PROCESO DE MEJORA PARA LA OPTIMIZACIÓN DE TIEMPOS EN EL ÁREA DE COTIZACIONES DE MITSUBISHI ELECTRIC DE MÉXICO S.A. C.V." Tesis de Licenciatura, Universidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80307.

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PROCESO DE MEJORA PARA LA OPTIMIZACIÓN DE TIEMPOS EN EL ÁREA DE COTIZACIONES DE MITSUBISHI ELECTRIC DE MÉXICO S.A. C.V.<br>MITSUBISHI ELECTRIC DE MÉXICO S.A. de C.V., es una empresa dedicada a la fabricación, venta, instalación y mantenimiento de elevadores para el mercado mexicano. Mitsubishi Electric de México S.A. de C.V., ha vendido más de 2000 elevadores y escaleras eléctricas, y ha exportado un número similar de elevadores. Como referencia, es importante mencionar que en la actualidad más del 50% de los equipos que son utilizados en el metro de la Ciudad de México han sido fabricados por

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6

Cannizzaro, Francesco. "Un nuovo approccio di modellazione della risposta sismica degli edifici storici." Thesis, Università degli Studi di Catania, 2011. http://hdl.handle.net/10761/288.

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La stima della risposta sismica di edifici storici in muratura a carattere monumentale costituisce un argomento di estrema rilevanza, ma allo stesso tempo, di difficile soluzione. I metodi di modellazione piu' accurati agli elementi finiti non lineari, capaci di cogliere la risposta non lineare e il progressivo degrado del solido murario soggetto ad azioni cicliche, richiedono la definizione di legami costitutivi complessi cui e' associato un enorme onere computazionale rendendo questi approcci non ancora pronti per essere applicati nella pratica ingegneristica. Nel passato diversi autori hann

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7

Córdoba, León Marco Antonio. "DISEÑO DEL PROCESO DE MANUFACTURA DE CERÁMICOS AVANZADOS DE ÓXIDO DE ALUMINIO: EFECTO DE LA TEMPERATURA DE SINTERIZACIÓN PARA SU POSIBLE APLICACIÓN EN LA INDUSTRIA TEXTIL." Tesis de Licenciatura, Universidad Autonoma del estado de México, 2017. http://hdl.handle.net/20.500.11799/80299.

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DISEÑO DEL PROCESO DE MANUFACTURA DE CERÁMICOS AVANZADOS DE ÓXIDO DE ALUMINIO: EFECTO DE LA TEMPERATURA DE SINTERIZACIÓN PARA SU POSIBLE APLICACIÓN EN LA INDUSTRIA TEXTIL.<br>Durante los últimos años se han investigado y desarrollado diferentes materiales para diversos ámbitos de aplicación industrial, sin necesidad de indagar, solo basta con observar nuestro alrededor y son tangibles los avances y aplicaciones de nuevos materiales por ejemplo en la industria del transporte, aeronáutica, militar, naval, del deporte entre otras. Con este contexto, en esta investigación se han desarrolla

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8

Díaz, Villegas José Antonio. "Manual de procedimientos para la selección de materias primas en el desarrollo de insecticidas de industrias h-24 S.A. De C.V." Tesis de Licenciatura, Universidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80300.

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Manual de procedimientos para la selección de materias primas en el desarrollo de insecticidas de industrias h-24 s.a. De c.v.<br>El departamento de Aseguramiento y Control de la Calidad de Industrias H24 S.A. DE C.V., cuenta con un sistema de gestión de calidad, que se encarga de diversas actividades, una de estas es la selección de materia prima para los productos de la compañía. Esta actividad no contaba con un manual de procedimientos para realizar las pruebas de selección de materia prima (fragancias); al no contar con un manual se corre el riesgo de cometer errores antes, durante y despu

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9

García, García Luis Alberto. "DISEÑO E IMPLEMENTACIÓN DE UN COMPENDIO DE MÉTODOS DE PRUEBA APLICADOS AL CONTROL DE CALIDAD EN LA MANUFACTURA DE PERFILES DE ALUMINIO PARA EL LABORATORIO DE ANÁLISIS INDUSTRIALES E INVESTIGACIÓN DEL PROGRAMA EDUCATIVO DE INGENIERÍA INDUSTRIAL DEL CENTRO UNIVERSITARIO UAEM VALLE DE MÉXICO." Tesis de Licenciatura, Universidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80302.

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DISEÑO E IMPLEMENTACIÓN DE UN COMPENDIO DE MÉTODOS DE PRUEBA APLICADOS AL CONTROL DE CALIDAD EN LA MANUFACTURA DE PERFILES DE ALUMINIO PARA EL LABORATORIO DE ANÁLISIS INDUSTRIALES E INVESTIGACIÓN DEL PROGRAMA EDUCATIVO DE INGENIERÍA INDUSTRIAL DEL CENTRO UNIVERSITARIO UAEM VALLE DE MÉXICO<br>El presente proyecto registra un contenido completo sobre los requerimientos del diseño e implementación de un compendio de métodos de prueba aplicados al control de calidad en la manufactura de perfiles de aluminio para el laboratorio de análisis industriales e investigación del programa educativo de inge

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10

Gómez, Martínez Andres. "IMPLEMENTACIÓN DE LA NORMA OFICIAL MEXICANA NOM-002-STPS-2010 EN LA EMPRESA TEXTIL BLUE GIANT." Tesis de Licenciatura, Universidad Autonoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/80303.

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IMPLEMENTACIÓN DE LA NORMA OFICIAL MEXICANA NOM-002-STPS-2010 EN LA EMPRESA TEXTIL BLUE GIANT.<br>Este documento muestra una implementación y propuestas dentro de la empresa textil “BLUE GIANT” tal implementación se basó acorde a la norma oficial mexicana NOM-002-STPS-2010 condiciones de seguridad - prevención y protección contra incendios en los centros de trabajo. Al implementar esta norma se buscaba establecer condiciones de seguridad de las instalaciones de la empresa para su adecuado funcionamiento y conservación y así prevenir riesgos a los trabajadores. Al igual se pretende generar una

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11

Marletta, Vincenzo. "FERROELECTRIC E-FIELD SENSORS, A nonlinear dynamic approach to the development of innovative measurement devices." Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/353.

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The exploitation of nonlinear dynamics behavior in ferroelectric material toward the realization of innovative transducers for the detection of weak and low frequency electric fields is the focus of this thesis. A nonlinear dynamical system based on ferroelectric capacitors coupled into a unidirectional ring circuit is considered with particular interest for developing novel electric field sensors. The focused approach is based on the exploitation of circuits made up by the ring connection of an odd number of elements containing a ferroelectric capacitor, which under particular conditions exhi

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12

Yogeshwaran, G. "On Flow Physics of Spinning Samaras." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5332.

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A particular form of winged seed (samara) dispersal technique adopted by nature uses autorotative (unpowered rotation of the wing generating thrust force against gravity) descent; for eg. in Maple and Mahagony trees. This technique provides the lowest descent velocities among various seed dispersal techniques found in nature ensuring the safety of the delicate seeds. Bio-mimicked solutions to important engineering problems in aerospace as well as in disaster management - air dropping of life-saving packages during floods can be inspired from the samara. The samara is a complex structure

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13

Verma, Ravi. "Development of Cryocooler Based High Performance Cryosorption Pump." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5262.

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The aim of this work is to develop high performance cryosorption (or cryoadsorption) pumps specifically for fusion applications. An actual cryopump for the above application will use the supercritical liquid helium flow through the channels embedded in the large scale cryopanels. In this case, the liquid helium requirement (both as normal and as supercritical fluids) will be large, depending on the size of the cryosorption pump. However, in a research laboratory wherein such large quantities of liquid helium are not available, an alternate arrangement of cooling the cryopanels has to be consid

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14

Dongre, Suryansh. "Crystalline Silicon Carbide Thin Films for Ultraviolet Detection." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4771.

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UV light detection has a lot of applications including secured satellite communication, solar and celestial observation and biological imaging. Wide bandgap materials are used to sense UV light. SiC is an excellent material for UV detection, having properties like high hardness, chemical inertness, thermal stability, high breakdown voltage etc. making it a very reliable and stable material for use in harsh/unknown environments. Growing SiC is a difficult task as it shows 250 different crystal structures and needs very high temperature to form crystalline film. Most of the studies use SiH4 (to

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15

Mukherjee, Anwesha. "Modified-graphene and carbon nanodots for nitrogen dioxide sensing: Effects of interfacial electronic modulation and dimensionality on gas interaction." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4839.

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Currently, there is an enormous demand for the development of high performance nitrogen dioxide (NO2) gas sensors for environmental pollution monitoring. Hence, there is a constant quest to replace traditional metal oxide nanostructures as gas sensing materials due to the challenges associated with high temperature working condition. Carbon nanomaterials, particularly graphene because of its unique properties have recently attracted a great deal of interests for gas sensing applications. Abundant defects and functional groups on reduced graphene oxide (rGO), a derivative of graphene, not only

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16

Gupta, Garima. "Excitons in monolayer transition metal dichalcogenides." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5706.

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Excitons are quasiparticles formed due to electrostatic attraction between the electrons and the holes in a semiconductor. This Coulomb attraction is very strong in the mono- layers of Transition Metal Dichalcogenides (TMDs) mainly because of strong quantum confinement, reduced dielectric screening, and high effective mass of electrons and holes in these material systems. A 2D hydrogen atom is a simple model to describe confined excitons in these monolayer films. A more formal way to describe excitons in thin semi- conductors is through the Bethe-Salpeter formalism which describes these

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17

Sykam, Nagaraju. "Carbon nanomaterials for energy and environmental applications." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5402.

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Environmental pollution and energy storage are two important issues in the modern day society. In this regard, Carbon nanomaterials have attained immense importance, due to their high surface area and electrical conductivity along with thermal and electrochemical stability. Various classes of mesoporous materials have been studied for energy storage and environmental applications especially waste water treatment and greener alternative to the materials in synthesis. In this regard, the present dissertation discusses the synthesis, characterization of carbon nanomaterials, such as exfoliated gr

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Modak, Chandantaru Dey. "Droplet, Jets, and Leaky Surfaces." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5853.

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Surface structuring on a micro-nano scale, combined with a low surface energy coating, leads to anti-wetting properties. Such surfaces also exhibit other properties such as self-cleaning, antifouling, bacteriostatic, drag reduction, and anti-icing. Hierarchical structures with dual-scale roughness provide the superhydrophobic surface with lower droplet adhesion and better protection against failure (i.e., Wenzel transition). This understanding has led to the study of nanostructured sieves, as the sieve wires (having diameters ranging from 10 to 100 microns) provide the higher-level roughness r

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Rekapalli, Monica. "Role of Physico-chemical Processes And Micro-structural Features in Influencing Moisture Loss and Engineering Properties Of Compacted Residual Soils Exposed To Environmental Relative Humidity." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5070.

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The moisture content of residual soils above the water table, and near ground surface (≤ 6 m) is influenced by the environmental relative humidity (RH). The focus of this thesis is to examine the physico-chemical and physical mechanisms of moisture retention and moisture loss in unsaturated residual soils in response to environmental RH and the implications of such changes on the engineering behavior of soils. The physicochemical drivers of moisture retention include forces and energy responsible for adsorption and desorption of water molecules on soil particle surfaces and capillaries,

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Shankar, Bhawani. "Safe Operating Area Reliability of AlGaN/GaN High Electron Mobility Transistors (HEMTs)." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4606.

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Gallium Nitride (GaN) based high electron mobility transistors (HEMTs) are extensively considered for power switching and RF applications by the virtue of their unique properties. However, despite of its attractive performance/cost ratio, AlGaN/GaN HEMT suffers from poor reliability which limits its penetration in the ever-growing power device market. Therefore, reliability of AlGaN/GaN HEMT has become a topic of intense research. In last one decade, the long-term reliability of GaN devices, has been greatly studied in literature. However, the ability to withstand high power under extrem

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Choudhury, Vishal. "Raman and Brillouin Nonlinearities in High Power Fiber Lasers: Novel Effects and Applications." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5563.

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High power fiber lasers due to their immense utility in both industry and research divisions, have seen a dramatic level of power scaling in the last two decades. This is due to the superior beam quality, thermal handling and compact nature inherently offered by all-fiber based systems as compared to other forms of laser systems. As of now, the rare earth doped Ytterbium (Yb), Erbium (Er) and Thulium/Holmium (Th-Hm) fiber lasers have shown remarkable levels of power with Yb outperforming the rest by order of magnitude levels. However as the power in the tightly confined fiber modes scale up, f

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Kranthi, Nagothu Karmel. "ESD Reliability Physics and Reliability Aware Design of Advanced High Voltage CMOS & Beyond CMOS Devices." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5474.

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Electrostatic Discharge (ESD) reliability is one of the major reliability concerns in integrated circuits (IC), which if not addressed while designing devices and circuits, can lead to a permanent damage to the Integrated Circuits. The same becomes a rather more stringent in case of system level ESD events (System level ESD), which usually occurs in uncontrolled or harsh environments. To address these issues physical insights into the non-equilibrium electron-phonon (electro-thermal) behaviour of these devices, under nano-second time scale high-current conditions, are required to be developed.

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Dutta, Gupta Sayak. "Physics-based Approach For Efficient & Reliable Enhancement-mode AlGaN/GaN High Electron Mobility Transistor (HEMT) Technology." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5858.

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Power semiconductor devices have been the key to growth of power electronics market, and cover application areas ranging from mobile stations (commercial) to missile seekers (military). Continuously increasing demand for improving the power handling capacities and need for higher bandwidth capable devices has impelled the need for search of novel device structures and materials other than Silicon (Si). High electron mobility transistors (HEMT) based on Gallium Nitride (GaN) have emerged as one of the most promising candidates to replace Si based power semiconductor devices. AlGaN/GaN HEMTs off

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Rautela, Mahindra Singh. "Hybrid Physics-Data Driven Models for the Solution of Mechanics Based Inverse Problems." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6123.

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Inverse problems pose a significant challenge as they aim to estimate the causal factors that result in a measured response. However, the responses are often truncated, partially available, and corrupted by measurement noise, rendering the problems ill-posed, and may have multiple or no solutions. Solving such problems using regularization transforms them into a family of well-posed functions. While physics-based models are interpretable, they operate under approximations and assumptions. Data-driven models such as machine learning and deep learning have shown promise in solving mechanics-base

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Devaraj, Manoj Kumar K. "Physical insights into unstart dynamics of a hypersonic mixed compression intake." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5655.

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Hypersonic air-breathing cruise vehicles powered by supersonic combustion ramjet engines are the potential candidate for future space and defense applications. The air intake of the scramjet engine is a vital component that uses shock waves to compress the air to pressure and temperatures suitable for supersonic combustion. Understanding the unstart dynamics of such intakes is of prime importance for the seamless operation of scramjet intakes. While the unstart dynamics in supersonic intakes are studied widely by various researchers, only a few such studies are reported in hypersonic int

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Neella, Nagarjuna. "Development of Graphene Metal Nanocomposite Resistive Films for Flexible Sensors and Body Warmer Applications." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4263.

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Mankind’s desire is to replicate the nature’s creation provided an impetus and inspiration to the rapid advancements, especially progress made in the sensors and other devices for next generation technologies from nanoscience and engineering. Generally, human being has five basic sensory organs, which helps to perform routine tasks in normal life. This clearly signify the importance of basic sensory organs in a human life. In a similar way, sensors and other devices are very important for most of the scientific and engineering applications. The aim of the present thesis work is to explore the

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Pal, Biswajit. "A multi-physics-based modelling approach to predict mechanical and thermo-mechanical behaviour of cementitious composite in a multi-scale framework." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6069.

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Concrete is a heterogeneous material whose constituents (e.g., cement paste, aggregate etc.) range from a characteristic length-scale dimension of a nanometre to a metre. Owing to the heterogeneity of concrete and the contrasting nature of its constituent’s (cement paste, aggregate) response at ambient and high temperatures, applying a homogeneous macroscopic model to predict concrete’s mechanical and thermo-mechanical performance is questionable. Hence, in this thesis, multiple physical and chemical processes that occur within the concrete constituents at different length scales are considere

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Рибін, О. М. "Двокомпонентні метаматеріали і мікросмужкові антени на їх основі". Thesis, 2018. http://dspace.univer.kharkov.ua/handle/123456789/14436.

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Дана дисертація присвячена теоретичному й експериментальному дослідженню ефективних електродинамічних властивостей двокомпонентних метало-діелектрич-них метаматеріалів у надвисокочастотному (НВЧ) діапазоні, а також створенню кон-цепції мініатюризації мікросмужкових прямокутних антен НВЧ-діапазону з підклад-ками на основі зазначених метаматеріалів із поліпшеними характеристиками ближ-нього і далекого полів. Розглянуті в дисертації метаматеріали являють собою ізотропні діелектрики (матриці) з періодично вбудованими в них металевими включеннями циліндричної або сферичної форми. У дисертації були

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Bhambay, Sanidhay. "Differential Encoding for Real-Time Status Updates." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4916.

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We consider the problem of status updates of a physical process over an unreliable channel. In this setting, one may not be able to reliably transmit the current state at all times. Instead, one is interested in the timeliness of the accurately received information. This is a setting for several cyber-physical system applications that require real-time monitoring and control. In this thesis, fi rst we have studied the periodic data transmission schemes for highly correlated source, that can always exploit the temporal correlation in the source messages. When the source has no feedback, i

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Abraham, Nithin. "Van der Waals Heterojunctions for Emerging Device Applications." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6049.

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Low-dimensional systems are an exciting platform for exploring new physics and realizing novel devices. The intriguing features, such as the existence of strongly bound multiparticle complexes and thickness-dependent band structures, enable us to utilize them to overcome many challenges faced by bulk materials and conceive new technologies. Since the isolation of graphene, the class of two-dimensional materials has grown tremendously. The array of materials one can choose from for implementing an idea is vast. Nevertheless, understanding the underlying physics is essential for utilizing these

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Kant, Pushpit. "Experimental study of the flow of granular media through a horizontal screw feeder system." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5981.

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A significant fraction of the materials handled in the chemical, food-processing, and pharmaceutical industries are particulate in nature. Screw feeder systems are often employed in such scenarios to achieve their bulk transport. Several studies have attempted to characterize the overall flow behavior of granular material in screw feeder systems by linking the flow rate with rotational speed and the design parameters of the screw. However, a detailed description of the flow mechanics of granular material in the screw feeder systems is lacking. This thesis describes a detailed experimental stu

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Majumder, Rudrashis. "Resource Allocation for Natural Disasters using a Game-theoretic Framework." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6001.

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The occurrence of a severe natural disaster causes loss of life and destruction of properties. The overall criticality of the disaster depends on the nature of the disaster and the physical characteristics of the affected locations. In the aftermath of a natural disaster, multiple emergencies often evolve at different geographical locations with casualties and infrastructure damage. In post-disaster scenarios, responsible authorities should initiate relevant disaster management activities to mitigate the devastating effects of natural disaster. Resource allocation is an integral part o

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Bhagat, Nishtha. "Design and Analysis of Surface Acoustic Wave Filters." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4687.

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The generation and detection of surface acoustic waves (SAWs) using interdigital transducers (IDTs) on a piezoelectric surface have been used to produce many high performance Band Pass Filters. This thesis focuses on the design and simulation of various SAW Band Pass Filters. IDTs can be fabricated on many piezoelectric substrates. The effect of substrate properties – electromechanical coupling coefficient and SAW velocity, on filter frequency response is analyzed. The IDT design properties comprise film thickness ratio, metallization ratio, acoustic aperture, and number of finger pai

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Karmakar, Anindya. "A phenomenological one-dimensional model for elastic ribbons." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4787.

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Ribbons exhibit fascinating buckling-dominated behavior under mechanical loading because of a unique combination of geometric dimensions. The recent interest in examining engineering applications of ribbon-like structures underscores the need for dedicated structural mechanics models to predict their complex behavior. In this thesis, we deal with ribbons that have at unstressed con figurations. Due to their physical appearance, such ribbons are typically modeled either as rods with highly anisotropic cross-sections (width of the cross-section is much larger than the thickness) or narro

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Gowdham, Prabhakar P. G. "Interaction Design and Distraction Detection of Drivers in Automobiles." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4924.

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In recent times, usage of electronic devices inside cars while driving has increased due to the introduction of new technologies to keep drivers comfortable and entertained. Systems like satnav ease out the navigation by offering optimised traffic plans at times of complex traffic and road conditions. Though technologies like music, radio and phone facilitate onboard communication and entertainment, they have potential in distracting drivers. The interaction with such technologies while driving takes the attention of drivers away from driving. As distraction of drivers leads to car crashes and

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Abhijith, J. "Quantum walks and spatial search on regular graph." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5602.

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Random walks and algorithms based upon them are used widely to explore large state spaces that arise while studying physical systems. In this thesis, we will discuss some quantum generalizations of such algorithms and study their complexity. In the first part of this talk, we will discuss quantum search in the presence of spatial constraints. One of the main results in this thesis is an efficient search algorithm that can find multiple marked elements under spatial constraints imposed by regular graphs. Next, we will focus attention on two-dimensional square lattices. Building on our earlier

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Gupta, Kishan Kumar. "Measuring Three-dimensional Deformations of Elastic Ribbons." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5586.

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Experimental techniques to measure and visualize kinematics in structural and solid mechanics range from humble strain gage rosettes to sophisticated digital image correlation methods. This thesis develops a stereo visionbased optical measurement technique and evaluates its efficacy for measuring three-dimensional elastic deformations of slender structures. Our motivation to develop the technique stems from the need to quantify/digitize the kinematics of slender elastic structures undergoing large displacements and rotations within the small strain regime. As devices composed of highly

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Bhat, Vijayashree. "Wideband Microstrip Patch Antennas and their Modifications for Practical Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5769.

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Printed antennas play an significant role in satellite, mobile, and other wireless communications networks, military systems and several more emerging applications in- cluding radar sensing and imaging. Several of these new applications not only have special demands for antenna designs but also require incorporation of smart features into it. In addition, research for high gain, wideband and compact antennas for several emerging technologies like 5G and IoT are rapidly progressing. In this work, design and analysis of several variants of wideband microstrip patch antennas are taken up. We b

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Maurya, Satyaghosh. "Investigating Membrane Dynamics And Oligomerization Of Pore-forming Toxins Using Single-molecule Fluorescence Techniques." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5711.

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The biological membrane is a thin fluidic matrix composed of a lipid bilayer that forms the primary cellular barrier against the extracellular environment. The high-density of embedded proteins and glycosylated molecules confer further complexity with unique specificities for signalling and transport across the membrane. Many pathogenic bacteria have evolved dedicated proteins, pore-forming toxins (PFTs), to form nanoscale ring-like pores on cellular membranes that lead to cell lysis and death. However, it is challenging to study how PFTs function due to the considerable heterogeneity in

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Chatterjee, Aritra. "Role of Fiber Orientations in the Mechanobiology of Cells under Stretch." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5632.

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Fiber reinforcement plays an important role in the structure and function of biological materials. Soft connective tissues in human body like artery, heart tissues, skin etc. exhibit anisotropic material responses due to the orientation of fibers along specific directions. At a cellular level, stress fibers in the cytoskeleton play an important role in maintaining cellular shape and influence cell adhesion, migration, and contractility. Cells respond to changes in their mechanical milieu and drive biochemical processes which induce growth and remodeling of the underlying material properties. T

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Vedam, Narayani. "From Particles to People: Vicsek-Inspired Behavioural Modelling Frameworks." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5757.

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In this thesis, we develop different modelling frameworks to capture the processes of opinion formation and disease spread. The common theme binding them is a nearest-neighbour-based interaction rule; while the closeness of opinions fosters inter-personal interactions, physical proximity facilitates disease spread. Since the nearest-neighbour rules with dynamic local interactions have been shown to enable consensus about the heading of self-propelled particles in a non-equilibrium system, we adapt the Vicsek model. In the first part of the thesis, we discuss two modelling frameworks that are

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Panachakel, Jerrin Thomas. "Machine Learning for Decoding Imagined words and Altered State of Consciousness from EEG." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5764.

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In the first part of the thesis, the results of our studies on the classification of phonological categories in imagined words are presented. We have investigated whether there are any statistically significant differences in the mean phase coherence values in six cortical regions when the participants imagined uttering nasal and bilabial consonants. The cortical regions considered are prefrontal, premotor, motor, somatosensory, sensorimotor and auditory cortices, which are normally involved in speech production. We have observed statistically significant differences in the MPC values i

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Rana, Himanshu. "Regional and Local-scale Analysis of Landslides Induced by Rainfall and Earthquakes." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5803.

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Landslides are major natural disasters which pose a significant risk to lives and infrastructure globally. As urbanization is increasing due to the increasing population in mountainous regions, the risk due to landslides draws grave concern owing to the damage and disruption since the last decade. Hence, regional-scale and local-scale landslide analyses are necessary to reduce the impact of landslides on lives and infrastructure; and efficiently prevent the landslide risk. The landslide analysis must be conducted separately for different triggering factors as the slope materials follow differe

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Sharma, Deepan. "Steady Sedimentation of Particles in Long Vertical Tube and Effect of End Boundary Conditions on Convective Motion." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5637.

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Sedimentation – settling of particles in a fluid- is observed in nature like rain droplets and dust particles in the atmosphere, and in a variety of industrial processes, like to clarify liquid as well as separate particles of different size and density. The simplest system is the sedimentation of mono-disperse particles in a vast stationary fluid. The main parameters are Particle Reynolds Number (〖Re〗_p based on terminal velocity), ratio of particle density to fluid density (ρ_p/ρ_f ), particle volume fraction (φ), and container dimensions for experimental and numerical methods. Two main que

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Bhole, Krishnakant. "Comprehensive Study on Synthesis and Characterization of Nanocellulose Reinforced Green Composites." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6011.

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Environmental issues caused by the non-biodegradability of synthetic thermoplastics have increased interest in more environmentally friendly alternatives that should be derived from renewable resources. This work focuses on producing green composites and biofilms by synthesizing nanocellulose (NC) from readily available natural and renewable sources like cellulose. The term NC refers to cellulose that has been reduced to the nanoscale. NC is used to describe a variety of cellulose nanostructures, including Micro Crystal Cellulose (MCC), Cellulose Micro Fibrils (CMF), Cellulose nano

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Murali, Krishna. "Engineering van der Waals Heterojunctions for Electronic and Optoelectronic Device Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4778.

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Efficient preparation and characterization of layered materials and their van der Waals heterojunctions lay the foundation for various opportunities in both fundamental studies and device applications. The vast library of 2D materials displays a range of electronic properties, including conductors, semiconductors, insulators, semimetal, and superconductors, and shows strong light-matter interaction. The fact that each layer in the layered material is bonded via van der Waals interaction opens up the possibility of assembling different layers arbitrarily without any consideration over the

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Pothnis, Jayaram. "Electric Field-Guided Alignment of Carbon Nanotubes in Polymer Matrix Composites for Structural Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5115.

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Carbon nanotubes (CNTs) have been extensively researched for diverse applications in recent years. In the present work, the use of low frequency non-uniform alternating electric fields to manipulate the alignment behavior of CNTs in an epoxy matrix has been explored for use in structural applications. CNT alignment was accomplished based on the dielectrophoresis (DEP) principle. The alignment methodology was developed and CNT alignment effectiveness was assessed through in-situ current measurements and polarized Raman spectroscopy data in addition to optical microscopy. Electrical and mechanic

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Malakar, Subhendu. "Experiences in using Reinforcement Learning for Directed Fuzzing." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5130.

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Directed testing is a technique to analyze user-specified target locations in the program. It reduces the time and effort of developers by excluding irrelevant parts of the program from testing and focusing on reaching the target location. Existing tools for directed testing employ either symbolic execution with heavy-weight program analysis or fuzz testing mixed with hand-tuned heuristics. In this thesis, we explore the feasibility of using a data-driven approach for directed testing. We aim to leverage the data generated by fuzz testing tools. We train an agent on the data collected fr

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Pundarika, Sughosh. "Bioremediation of Mechanically and Biologically Treated Waste Of Bangalore City: An Experimental and Numerical Study." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4443.

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Remediation of the existing MSW dumpsites has received considerable attention these days and there is an urgent need to address this issue in order to maintain the over hygiene of the urban environment. An approach consisting of experimental and numerical studies to understand the behavior of the waste to be remediated is essential in this regard. In this study, laboratory scale experimental studies were carried out to characterize the mechanically and biologically treated (MBT) waste of Bangalore city. The physical composition, index, engineering and biochemical properties of the

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Mukhopadhyay, Ankan. "Fundamental aspects of the interface engineering in the heavy metal/ferromagnet-based perpendicularly magnetized systems." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5609.

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The ferromagnetic (FM) material finds its applications due to the property of spontaneous magnetization. An FM object can hold its state of magnetization unless any external stimuli change it. The easy manipulation of its state by an external magnetic field or spin current manifests FMs usability for digital data storage and logic devices. The efficiency and speed of magnetic data storage and logic devices should be optimized to match the existing semiconductor devices. This thesis has mainly proclaimed the fundamental dependence of magnetism on the composition of the layers and geometry, esta

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