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Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Mertoli, Patrizia. "Studio della fotoossidazione in nanocompositi polimero/argilla." Thesis, Università degli Studi di Catania, 2011. http://hdl.handle.net/10761/204.

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Al fine di ottenere informazioni sulla suscettibilita' dei nanocompositi polimero-argilla alla fotodegradazione sono stati preparati, mediante polimerizzazione radicalica in situ, dei nanocompositi polistirene/montmorillonite (PS/MMTYx). Per facilitare la formazione di strutture esfoliate la montmorillonite e' stata modificata sostituendo i cationi inorganici con cationi dell'imidazolo. A tal proposito, oltre ai surfactanti dell'imidazolo (C12, C16, C18) gia' noti in letteratura, sono stati preparati dei nuovi cationi con una struttura di base vinilimidazolica nei quali sull'azoto in posizione

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Schembri, Florinda. "Experimental study for the control of two-phase microfluidic flows." Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/366.

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Microfluidic systems can be considered as nonlinear dynamical systems. In the perspective of control systems toward the development of highly integrated and portable Lab on a Chip systems (LOC), is of primary importance the identification of the nonlinear processes involved in such phenomena. The main aims achieved in this PhD thesis are: the identification of input-output relation maps for the two-phase flow patterns, the design of innovative PDMS micro-optical systems for microfluidics' monitoring, the parameters estimation of a mathematical model by means of synchronization of two dyn

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Carollo, Alessandro. "Il ruolo delle politiche marittime nello sviluppo delle regioni costiere. Ipotesi di riequilibrio del sistema portuale siciliano." Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/130.

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La tesi analizza le politiche marittime per indagare il ruolo dei sistemi portuali nello sviluppo locale delle regioni costiere e nella sostenibilita' del rapporto tra spazio marittimo e territori interni. Pertanto la ricerca si propone di perseguire un duplice obiettivo: - Analizzare il ruolo attivo delle politiche marittime e delle infrastrutture portuali nelle strategie di riequilibrio territoriale. - Valutare l'efficacia nel contesto locale delle politiche di sviluppo portuale promosse a livello europeo e nazionale. Ricostruendo il quadro delle politiche marittime individuate a livello s

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Mier, Quiroga Miroslava de los Ángeles. "Caracterización de la materia orgánica disuelta de dos tratamientos biológicos (anaerobio y aerobio) con índices espectroscópicos." Tesis de doctorado, Universidad Autónoma del Estado de México, 2021. http://hdl.handle.net/20.500.11799/112013.

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Tesis de Doctorado en Ciencias del Agua de la Miroslava de los Ángeles Mier Quiroga<br>La materia orgánica disuelta (MOD) ha sido ampliamente estudiada en el suelo, las aguas naturales y los sistemas de potabilización; sin embargo, debido a la complejidad de su composición ha sido un reto estudiar la MOD en los efluentes de los sistemas de tratamiento biológico. Teniendo en cuenta el impacto que los parámetros operativos pueden tener en las características de la MOD, el objetivo de este estudio fue a) evaluar la influencia de cinco tiempos de retención hidráulica (TRH) (19, 15, 13, 10 y 8 h) e

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Thakur, Shraddha. "Raman Spectroscopy on Few layer graphene." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6179.

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Graphene is a two-dimensional allotrope of carbon exhibiting planer honeycomb lattice structure.1 A carbon atom in graphene makes three σ-bonds with the neighbouring atoms in the plane and one π-bond perpendicular to the plane of these carbon atoms. The delocalized electron due to side overlapping of π-bond in graphene gives high intrinsic carrier mobility. The maximum carrier mobility of single layer suspended graphene is 200,000 cm2V-1s-1,2 whereas the maximum carrier mobility of silicon is 1,400 cm2V -1s-1. 3 Hence, graphene is an excellent substitute for high-frequency FET switch ov

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Swetha, Jayanthi. "Graphene and Graphyne based three dimensional porous architectures." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5274.

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The main objective of the thesis is to introduce porous structure into graphene/graphene oxide materials and study their effects on various physics/chemistry related applications. Introduction of porosity may be achieved in the already formed graphene oxide network or synthesize porous network that resembles graphene. Both are attempted in the present thesis and hence, the thesis consists of two distinct aspects including preparation and studies of (1) 3D porous architectures of graphene with extrinsic porosity and (2) graphyne networks (poly(tri-ethynylbenzene)) possesing intrinsic porosity.

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Menon, Krishna. "Towards Design, Fabrication, Packaging, Integration, and Characterization of High-Performance MEMS Gyroscopes." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5992.

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MEMS vibratory gyroscopes are used to measure the angular rate of a body by sensing the Coriolis force induced motion of the sensing element vibrating in a rotating frame of reference. MEMS gyroscopes find use in a wide variety of applications such as smartphones, automobiles, navigation, bio medical instruments, industrial systems, etc. A considerable amount of research has been done over the past two decades towards the improvement of MEMS gyroscope performance in terms of its scale factor, resolution, dynamic range, temperature sensitivity and bandwidth, with a goal of using them in

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8

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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9

Mandal, Pranay. "From Independent Control to Self Propulsion of Helical Nanoswimmers : Towards All Magnetic Active Matter." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4264.

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There has been a surge of interest in recent years to design and fabricate various types of motile micro/nanoparticles that can be maneuvered using chemical, optical, thermal, electrical or magnetic energy sources. A collection of such motile particles can be used as a model system to study various active matter phenomena, which can answer fundamental questions related to non-equilibrium statistical physics. This motile micro/Nano system can also be important in various biomedical applications like targeted drug delivery, microsurgery, biochemical sensing and disease diagnosis. Among several

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10

Rao, Ananya S. "Trends and Variability in Terrestrial Carbon Fluxes and Stocks over India in the 20th and 21st centuries: A Multi-model Based Assessment." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4826.

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Terrestrial ecosystems play an important role in the global carbon cycle by naturally taking up carbon from the atmosphere through photosynthesis and storing this carbon as biomass and soil carbon. There exists a strong, yet complex and uncertain relationship between the terrestrial ecosystems and the climate system. Inadequate knowledge on the regional terrestrial carbon cycle dynamics translates into large uncertainties in the estimation of global terrestrial carbon stocks and fluxes and in turn the climate projections as well. It is important to gain a better understanding of the terrestria

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11

Singh, Namrata. "Development of Nanomaterials as Antioxidant Enzyme Mimetics for Cellular Redox Homeostasis." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5344.

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Nanomaterials possess a myriad of potential in various biomedical fields such as cancer diagnostics, biosensing, imaging, immunoassay, drug delivery and therapeutics etc. In particular, the ability of the nanozymes to modulate the catalytic activities and biological functions of natural enzymes attracts burgeoning interest for various biomimetic applications. There is a significant relevance of nanozymes which can regulate the reactive oxygen species (ROS) levels in cells, mimicking the cellular antioxidant enzymes due to their possible therapeutic potential in various oxidative stress related

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12

Borooah, Rohit. "Investigations into Incineration of Sanitary Napkin Waste Using Single Chamber Incinerator." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5462.

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Commercially available disposable sanitary napkins are the most common method of menstrual hygiene management in most urban regions of India (van Eijk, 2016) (Mathiyalagen et al., 2017). It is estimated that in India a waste of 58,500 million sanitary napkins can be generated each year (Garg et al., 2012). A typical sanitary napkin consists of several layers made from cellulosic fibres, polypropylene fibres, superabsorbent polymer, etc. (Das & Pourdeyhimi, 2014). Due to non-biodegradability of certain materials, disposal of such napkins is a major environmental concern. Among other issues, soi

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Mudakavi, Rajeev J. "Development of anti-infective therapy against intracellular pathogens using targeted particulate delivery systems." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5342.

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Pathogens from bacterial class: Salmonella, Mycobacterium tuberculosis, Listeria can survive and replicate intracellularly. While some pathogens remain cytosolic others such as Salmonella and Mycobacterium tuberculosis enhance their protection by forming vacuoles. The pathogens modulate the host cell’s antibacterial response and prevent clearance by lysosomes to suit their intracellular survival. Conventional antimicrobial agents cannot breach the bacterial defenses to attain required concentration required for killing the bacteria. The development of growing resistance in these intracellular

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14

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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15

Datey, Akshay. "Mechanistic insights into the effects and applications of shockwaves in prokaryotic and eukaryotic organisms." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5493.

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Shock waves are non-linear waves propagating at speeds greater than the speed of sound, with a unique characteristic of instantaneously increasing the pressure, temperature and density of the medium through which they propagate. For over a few decades, the phenomenon of shock waves has been associated with aerospace research. The emerging paradigms of present day shock wave research have opened up new horizons for interdisciplinary applications. Shock waves have been extensively used for various medical procedures like extracorporeal lithotripsy, treatment of avascular necrosis, etc. However,

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16

Saumitra. "Development and application of multi-photon microscopy in neuroscience and nanoscience." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4511.

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Neuroscience is at crossroads. Several interdisciplinary optical developments centred around nonlinear optical processes helps in better understanding of brain function at sub-micron and millisecond precision. Traditional neurophysiological approaches measure the activities from one or group of neurons at a time. Multi-Photon microscopy paves the way towards network level understanding of brain circuit in slices and also in behaving animals. The technological advancement in the field of nonlinear microscopy and a rich toolkit provided by developments in nanoscience and nanotechnology (Ru

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17

Malayil, Sreesha. "Valorization of Residual Ligno-celluloses from Anaerobic Digesters Through Product Recovery." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5325.

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Complete digestion of lignocellulosic biomass during anaerobic digestion (AD) is impossible due to recalcitrance created by lignin, consequently leaving behind a significant part of the feedstock unconverted to methane. The lignin within prevents access to other degradable lignocellulosic constituents, namely cellulose, hemicellulose, pectin, etc. lowering conversion efficiencies to ~60% for most feedstocks. Such residues could be valorized by converting them to value added by-products when AD process is appropriately tweaked/ interrupted. The nature of lignin and its degradability under AD co

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18

Nayak, Namratha. "Design, Development and Testing of Cervical Dilatation Measurement System." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6053.

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Monitoring labour progression is of utmost importance, to avoid complications during childbirth. Frequent monitoring allows prevention, identification, and management of complications during childbirth. Improper monitoring can result in serious complications and can negatively impact the health of both the mother and the baby. The problems get exaggerated in remote villages due to lack of medical infrastructure and timely transportation. The parameters that are commonly monitored during labour are frequency, strength and duration of uterine contractions, cervical effacement and dilatation, and

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Gunasekaran, Saranya. "Biodiesel from Estuarine Microalgae - Diatoms." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5409.

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Rapidly depleting fossil fuel reserves with the burgeoning demand, associated escalating GHG footprint, and changes in the climate necessitated the exploration of alternate sustainable energy resources that are renewable, economically viable, and environmentally sound. Among renewable energy feedstocks, microalgae possess an intrinsic ability to convert atmospheric CO2 into renewable bioproducts at a shorter cycling period. Microalgae-based biofuel is emerging as a viable feedstock as it possesses faster growth rates and higher lipid productivity. Sustainable biofuel production from microalgae

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20

George, Sweta Mariam. "Exploring Soft Matter and Modified-Liquid Electrolytes for Alkali metal (Li, Na) Based Rechargeable Batteries." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5913.

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The current upsurge in demand for high energy density batteries for applications across industries ranging from small scale portable electronics, electric automobiles to storage grids, has led to research in next generation, beyond lithium -ion batteries. Alkali metals like lithium and sodium, by virtue of their high theoretical capacity (3860 mAhg-1 for Li and 1165 mAhg-1 for Na) and low electrochemical potentials, are most suitable anodes for producing high energy density batteries. The vigorous reactivity, unstable solid-electrolyte interface and dendrite formation are some of the major hur

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21

Pramod, R. T. "Compositionality of Object Representations in Brains and Machines." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5340.

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Compositionality in object vision can be defined as the principles governing the relationship between whole objects and their constituent attributes. It is known that object information falling on the retina is processed in a hierarchy of cortical regions starting from simple edge-detectors in the primary visual cortex to complex shape representations in the higher visual cortex, yet we still do not understand how whole objects are represented in terms of their attributes. With recent advances in computer vision, we have, for the first time in history, a very good machine vision system i

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George, Jude Baby. "Neuro-electronic Hybrid Systems." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5091.

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Artificial neural networks have provided a powerful motif to implement extremely complex functions of high dimensional inputs like images and text. These are now being used to directly control robotic systems, to enable them to work in natural environments, with an aim to create human-like capabilities. However, even the most advanced state-of-the-art deep neural inference engine chip is still multiple orders of magnitude more energy inefficient compared to biological neurons. For instance, the active human brain consumes only about 15W of power and has about 85 billion neurons with an equival

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Lagisetty, Ravikumar. "Advanced Optimal Spacecraft Guidance For Terminal Phase Rendezvous and Docking." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5005.

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There have been growing interest in Rendezvous and Docking (RVD) missions for on-orbit refueling, on-orbit servicing, orbital debris removal, etc. A very important requirement in RVD missions is soft-docking at the terminal phase. Moreover, as satellite applications are increasing, space is getting clustered with more satellites and debris, and hence debris avoidance is necessary. There is also a critical limitation in the sensor's Line-of-Sight (LOS) angle with respect to the target satellite. In addition, limited availability of fuel and on-board computational capability are serious limitati

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Pandey, Mrityunjay. "Scanning Probe microscopy of van der Waals heterostructures and non-equilibrium magnetotransport in graphene." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6006.

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Graphene is a two-dimensional semimetal that has linear dispersion in energy-momentum space. When graphene is subjected to a perpendicular magnetic field, the dispersion is no longer linear, resulting in discrete energy levels because of the formation of cyclotron orbits of different energies. This energy discretization leads to quantum oscillations in longitudinal magnetoresistance known as Shubhnikov de-Haas oscillations which provide a plethora of properties, including the effective mass of charge carriers and topological properties like Berry phase. Furthermore, the transverse resist

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Bansal, Shubhi. "Droplet Interface Oscillations using Electrowetting-on-Dielectric (EWOD) for Open-Chip Microfluidic Applications." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5431.

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Droplet manipulation on microfluidic platform has gained significant importance due to its applicability to various healthcare technologies, where larger equipment can be reduced to portable handheld systems based on microfluidic devices. Electrowetting-On-Dielectric (EWOD) has emerged as one of the most promising techniques for droplet manipulation in microfluidic devices because it is an easily programmable, cost effective, reconfigurable and reversible technique. Droplet creation, actuation, merging, mixing, and splitting are the fundamental operations which enable biochemical assays

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Anoop, A. M. "Structural acoustics of perforated panels." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4993.

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In this work, radiation and transmission of sound through flexible perforated panels set in infinite rigid baffles are investigated. The treatment is largely analytical using Fourier transforms and contour integrations. Numerical calculations are only used occasionally. The work is largely divided into three parts: the first part involves radiation and transmission studies using the one-way coupled formulation, the second part investigates the same problems using the two-way coupled (or the fully-coupled) formulation and the third part involves derivations of closed form expressions for the mo

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Siva, MS. "Integrated Relative Position and Attitude Control of Distributed Spacecraft Formation For High Resolution Imaging." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4184.

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One of the major challenges in space technology is to achieve high resolution imaging of the intended area on demand to meet civilian and military applications. Spacecraft formation flying with coordinated control of smaller satellites offers improvement in image resolution using distribution of payloads across the formation group. Quick revisit and stereo coverage, as well as provision of modularity and redundancy, are other benefits achieved by formation flying. The thesis addresses spacecraft formation flying with coordinated control of smaller satellites in realizing this high resolutio

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Chaturvedi, Abhishek. "Nano-mechanical, optical and structural property correlations in binary, ternary, and quaternary tellurium-based chalcogenide glasses." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4358.

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Over a half century, from the advent of chalcogenide glasses, it was used for various applications like xerography, phase change memories (PCM), solar cells, infrared devices and so on. These applications made use of some interesting properties exhibited by these glasses like photoconductivity, amorphous to crystalline transition, photovoltaic effect, refractive index changes, and so forth. Development of newer chalcogenide systems in the past two decades paved the way for their promising future in PCMs, where the significant difference in properties (optical, electrical, thermal) between amor

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Gopalan, Hariprasad. "Synthesis, Microstructural Stability and High Temperature Deformation of Alumina-Carbon Nanotube Composites." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4326.

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Structural ceramics such as alumina are known to have excellent hardness and high temperature mechanical properties. In view of this, they are used as refractory linings to mitigate the effect of high temperature exposure. It is a highly stable compound and it has excellent chemical inertness and biocompatibility: it finds use in hip replacements. As a high bandgap electrical insulator, it does not absorb electromagnetic radiation in a fairly wide range of frequencies. This property is exploited to make optical and infrared transparent windows with high density pore free alumina. In addi

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Agnihotri, Ruchika. "Cerium Oxide Based Active Catalyst for Green Hydroxylammonium Nitrate (HAN) Fueled Monopropellant Thruster." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4996.

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Monopropellants are widely used for propulsion and gas generation applications. The current state of art monopropellant systems are based on hydrazine propellants. While hydrazine has a strong heritage as a versatile monopropellant, some of the inherent problems associated with hydrazine like toxicity, high vapor pressure and associated storage and handling cost have been a major concern. These concerns led to the exploration of nontoxic and better performing alternate propellants, among which Hydroxylammonium Nitrate (HAN) is a promising candidate and scores over other monopropellants in term

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Prakash, Praneet. "Transport in Interfacial Systems: Biosensor, Polymer, Colloid & Bacteria." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4470.

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Life forms as we know emerged due to unique mechanical and transport properties exhibited by Soft Materials at interface. For instance, the interior of a cell is separated from outside environment by lipid bilayer which self-assembles in aqueous environment to create an interface by virtue of hydrophobic and hydrophilic ends. Examples of interfacial system includes polyelectrolyte multilayers, gel, colloid, surfactant, liquid crystal, variety of biological materials, bacterial systems etc. In this research work, we set out to understand transport in bioinspired interfacial system which are cru

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Meghanani, Amit. "Pitch-Synchronous Discrete Cosine Transform Features for Speaker Recognition and Other Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4822.

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Extracting speaker-speci c information from the speech is of great interest since speaker recognition technology nds application in a wide range of areas such as forensics and biometric security systems. In this thesis, we propose a new feature named pitch-synchronous discrete cosine transform (PS-DCT), derived from the voiced part of the speech for speaker identi cation (SID) and veri cation (SV) tasks. Variants of the proposed PS-DCT features are explored for other speech-based applications. PS-DCT features are based on the `time-domain, quasi-periodic waveform shape' of the voiced s

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Raj, Prince. "Optimization of parameters in SiC production via Acheson Process – a hot model study." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4869.

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Silicon carbide (SiC) is produced industrially in a heat resistance furnace using quartz (silica) and raw petroleum coke (RPC) as the raw material. In this process, commonly known as the Acheson Process, a large current is passed through a graphite resistor (heating element) located at the center of the furnace which is surrounded by the mixture of the raw material. When the resistor temperature (i.e. core temperature) reaches to the reaction temperature, which is 15150C or above, silica and carbon react to form SiC and carbon monoxide. The reaction is highly endothermic in nature. The major d

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Gnanendra, P. M. "Experimental Studies on Co-current downdraft Biomass Gasifier." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4188.

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The main theme of the work carried out and reported in this thesis is to understand the processes involved in a co-current downdraft biomass gasification reactor and to analyse the data obtained with an attempt to provide a consistent and rational scientific reasoning of the behaviour and processes studied. The work carried out largely comprises of experiments involving parametric and investigative studies on an experimental setup built specifically for this purpose. The background for this study is based on the IISc design for the biomass gasifier where the technology developed at CGPL, II

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Mitra, Abhijit. "Dynamics of Laminar Separation Bubbles on Low Reynolds Number Airfoils." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4991.

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This is a detailed study on the aerodynamics of low Reynolds number airfoils. E387 airfoil that comes under the category of trailing-edge stall is used extensively in this study. The reduction in lift due to low Reynolds number effects can be modeled by the so-called viscous decambering of airfoils. In particular, we show this viscous decambering effect can be subsumed in the zero-lift angle term. It is further demonstrated that leading-edge camber angle plays an important role in explaining the stall characteristics of different airfoils. An attempt has been made to heuristically illust

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36

Javvaji, Brahmanandam. "Plasmon Phonon Coupled Dynamics of Nanocrystalline Structures." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4185.

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This thesis is an attempt to understand the characteristics and responses of plasmon phonon coupled dynamics in nanocrystalline structures. An energy based Lagrangian formulation is developed with fundamental field quantities like displacement, charge, electric and magnetic field as variables. Governing differential equations of motion are derived from variational calculus. A new computational framework is implemented to solve for system degrees of freedom, which involve energy and force exchanges between atomic and continuum representation of the system. The developed simulation framework is

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Srihari, M. "Characterizing Patenting in an Indian University System: A Case Study." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5258.

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University patenting reflects on the strength of a nation’s innovation in basic research and ability to seed innovation in industry. Despite the growing support from the government for public funded universities to patent their research, university patenting in India remains a small fraction of patenting happening at other institutional sectors like government research institutions and the private sector. From the extant literature, we found that most research on university patenting was on their public and private benefits. This concern on low patenting at public funded Indian universities co

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Reshma, Mohan T. "Optimization of Wastewater Treatment Process in a Bioreactor Through Hydrodynamic-biokinetic Modeling and Experimental Studies." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6059.

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Membrane bioreactor has emerged as one of the leading technologies for treating municipal and industrial wastewater due to its efficiency in producing high-quality effluents. One of the significant challenges in bioreactors is the high energy and operating costs. The diffused aeration process of a bioreactor is the most energy-intensive operation amounting to 45-75% of the plant energy costs. This study attempts to optimize the wastewater treatment (WWT) process in a bioreactor through modeling and experimental studies. The overall aim is to develop efficient models which can be used to reduce

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Tripathy, Abinash. "Fabrication and Characterization of Nanostructured Antibacterial Surfaces." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5496.

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Bacterial antibiotic resistance is becoming wide spread due to the excessive and unregulated use of antibiotics in healthcare and agriculture. At the same time the development of new antibiotics has become slow. Adding antibiotics to surfaces result in poor long-term performance in preventing bacterial build-up. This also increases the risk of development of more drug resistant strains. Hence, approaches for realising antibacterial action through physical surface topography have become increasingly important and interesting to the community in recent years. The complex and strain dependent nat

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Hebbale, Deepthi. "Prospects of Bioethanol from Estuarine Macroalgae." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5017.

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Burgeoning dependence on fossil fuels for transport and industrial sectors has been posing challenges such as depletion of fossil fuel reserves, enhanced greenhouse gas (GHG) footprint, and imminent changes in the climate, etc. Fossil fuels are regarded as unsustainable and questionable from economic, ecology and environmental point of view. Therefore, the pursuit for an environmentally benign and sustainable source of energy started with the advent of oil crisis in 1970, major focus of energy policies shifted to biofuel production from renewable resources. Biofuels minimizes the fossil fuel b

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Rijal, Ajay. "Effect of High-Pressure Torsion and Natural Ageing on Hardness, Electrical Resistivity and Fatigue Properties of Commercially Pure Cu." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4572.

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Commercially pure Cu was processed through high-pressure torsion (HPT) at a pressure of 6 GPa starting from ¼ up to 50 turns. These samples were then naturally aged for 1.75 years under the laboratory condition. Subsequently, microhardness, electrical resistivity, and fatigue response of samples in bending were evaluated and correlated with microstructure. Grain size monotonically decreased with the number of HPT turns and became saturated at ~300 nm after an equivalent strain of ~40. Low-angle grain boundaries and sub-grains were formed at the onset of straining, which transformed into high a

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Ranjan, B. S. C. "Development of Support for Assessment of Creativity, Novelty and Requirement Satisfaction in Designing." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4956.

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The topic of this research in this thesis is creativity assessment of solutions developed in the engineering design process as a means of aiding designers to focus their creative effort during the process. Both engineering design process and creative process are planned, and occur, together in practice. Engineering design is a complex process involving both problem finding and problem solving, broadly divided into four stages: task clarification, conceptual design, embodiment design and detailed design. Literature on design models, theories and approaches is studied to understand the nature o

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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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Geetha, Ganesh Kolappan. "Structural Health Monitoring with Laser Doppler Imaging of Ultrasonic Guided Waves." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4690.

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This thesis deals with ultrasonic guided wave based non-destructive inspection and health monitoring of aircraft structural components using a non-contact sensing scheme based on laser Doppler scanning imaging technique. Ultrasonic guided waves are elastic waves which travel relatively long distance and are guided by the geometry of thin structures with minimal loss in amplitude. Experiments are conducted using piezoelectric actuator and a 3D scanning Laser Doppler Vibrometer (LDV). The piezoelectric actuators bonded on the structure excite ultrasonic guided waves. The laser beam from the LDV

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Singh, Shobhit Pratap. "Evaluation of Low-stress High-temperature Creep: Insights into the Harper-dorn Creep." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5584.

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The theory of creep behavior of single crystals and polycrystalline materials having large grains at very low-stresses and at very high temperatures, as originally proposed by Harper and Dorn in 1957, has been under constant debate since its proposition. The major dispute over the initial observations of Harper and Dorn generally concern the value of the reported creep exponent: While Harper and Dorn reported it to be 1, later many observed it to range from 1 to 3. The variation of the dislocation density with the applied creep stress was later reported to be independent of the applied stress

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Gupta, Rimzhim. "An Approach Towards Inactivation of Susceptible and Antibiotic Resistant Bacterial Contamination using Novel Photo–(electro)-catalysts." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4941.

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Water in most rivers in India does not meet the standards for drinking and even for bathing purposes due to the high concentration of coliforms, organic and inorganic contaminants. Overuse, uncontrolled release and careless disposal of drug, pharmaceutical components from hospital and domestic waste imparts a crucial role in developing a resistance towards antibiotics in microbes over a period of time. The class of bacteria affected by antibiotics are hereby called susceptible bacteria and the class that shows resistance towards antibiotics are known as antibiotic resistant bacteria. Therefore

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Kurade, Rajan Bharat. "Control of shock-induced vortex breakdown in Transonic regime on a slender delta wing body configuration using blowing." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5121.

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Modern high speed aircrafts feature highly swept and low aspect ratio wings, mainly to increase the critical Mach number and reduce the wave drag. A special case of swept wings is wings with triangular planform commonly known as delta wings. The delta wings provide advantageous aerodynamic characteristics such as small lift curve slope, non-linear lift and a higher stalling angle due to it’s ability to form two counter rotating leading edge vortices. These vortices are strong and are a source of high energy which enables higher suction on the lee-ward side of wing and results into an inc

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Vinila, N. V. "Architecting Conjugated Molecules for Band Gap Engineering & Photostability." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5314.

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Organic photovoltaic (OPV) modules are flexible, light weight, transparent and thin compared to other emerging photovoltaic technologies, making them well-suited for applications ranging from solar windows to fabrics. A large number of polymer semiconducting materials of Donor-Acceptor–Donor (D-A-D) architecture have been synthesized and used in OPV devices in recent times reaching remarkable power conversion efficiencies up to 13%. However, the diversity of monomeric units and the numerous available reports in the structural complexity of D-A-D conjugated p-type polymers indicate that there i

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Singh, Manish Kumar. "Implicit Gradient Reconstruction for Unstructured Mesh Finite Volume Method." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5934.

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In the present work, an Implicit Gradient Reconstruction (IGR) method is proposed in the context of Finite Volume Methodology (FVM). There are three computationally intensive steps involved in a typical finite volume framework for a spatially second-order accurate upwind scheme. These are solution reconstruction, solution limiting and flux finding. Solution re- construction involves determination of gradients while solution limiting requires comparison of double precision numbers. Further, computation of gradient and solution limiting is cell based procedure while flux finding is edge/fa

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Ashwin, K. P. "Development of a Flexible Actuator and Motion Planning for Endoscopic Robots." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5435.

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Endoscopy is a procedure by which a long flexible device called the `endoscope' is inserted into a patient's gastro-intestinal(GI) tract primarily for diagnosis. An endoscope is typically equipped with a camera, fiber-optic lighting system and nozzle for spraying water or pumping air. Most commercial endoscopes are also equipped with a catheter channel for passing instruments (catheters) for specific treatments and diagnostic procedures. The thesis aims at addressing two common issues faced by endoscopists: 1) Actuation and positioning of the catheter tip at a desired location while m

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