etd AT Indian Institute of Science: Recent submissions
Now showing items 1621-1640 of 9466
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Optimal control and differential games in a Hilbert space
In this thesis, we study some aspects of optimal control and differential game problems in an infinite-dimensional Hilbert space. We mainly discuss the dynamic programming and viscosity solution approach to these problems. ... -
An investigation of the role of buoyancy in magnetic polarity transitions in rapidly rotating dynamos
The dynamo operating within the Earth’s outer core generates a predominantly north-south dipolar magnetic field. Occasionally, the magnetic dipole axis flips its orientation and retains its approximate alignment with the ... -
Studies on Advanced Soluble Lead Redox Flow Batteries: Concepts to Contexts
Redox flow batteries (RFBs) offer to make renewable energy storage more affordable, alongside accelerating opportunities for utility-scale development of solar/wind energy storage. Redox flow batteries (RFBs) have many ... -
RNA granules and DNA damage: Exploring the role of posttranscriptional gene control upon genotoxic stress
Cells constantly encounter genotoxic stress arising from extrinsic environmental factors or intrinsic metabolic byproducts. In response, cells activate a robust DNA damage response (DDR) network to preserve genomic stability. ... -
Application of least squares kinetic upwind method to strongly rotating viscous flows
The Least Squares Kinetic Upwind Method (LSKUM) is a node-based method. Ghosh and Deshpande, as well as Ramesh & Deshpande, have demonstrated that LSKUM works on any type of grid—structured, unstructured, Cartesian, Chimera, ... -
Numerical methods for non-homogeneous hyperbolic conservation laws
The numerical simulation of hyperbolic conservation equations has reached a level of maturity with the development of several efficient numerical methods in the past three decades. The same level of success is not present ... -
Some numerical studies on the airflow over mountains
A study of ‘Airflow over Mountains’ is carried out using a two-dimensional, stratified, time-dependent, nonlinear numerical model. Numerical experiments are conducted for high Froude numbers (Fr > 1) and low Froude numbers ... -
Mechanism of reversion in highly accerlerated turbulent boundary layers
This thesis consists of two related parts which are complementary to each other but can also be read independently. The first part is a study of the development of both the mean and fluctuating flow quantities in an initially ... -
Development of AlN based Piezo-MEMS Technology: Film Growth to Device and Application
Aluminum nitride (AlN) has emerged as an excellent material for a variety of MEMS applications owing to its unique combination of properties such as- low dielectric constant, strong polarity, low dielectric and acoustic ... -
Tuning Electrical and Thermoelectric Properties of Molecular Junctions by External Stimuli: From Monolayers of Molecules to Amorphous Polymer Thin Films
Molecular electronics explores electronic functionality at the sub-nanometer scale by utilizing individual molecules as active components. The molecules provide unique advantages such as extreme miniaturization, chemical ... -
Transition in flexible tubes and channels
A combination of experiments, flow simulations and linear stability analysis is used to develop a fundamental understanding of the instability and transition in flows through flexible tubes and channels. The present study ... -
Dehydration of alcohols
Catalytic vapor phase dehydration of i-propanol, n-butanol, i-butanol, s-butanol and t-butanol is studied in a fixed bed flow reactor under isothermal conditions over various catalysts to understand the influence of catalyst ... -
Estimation of thermophysical properties of organic liquids: diffusion coefficients and excess volumes.
The objective of this work is to experimentally determine the thermophysical properties such as diffusion coefficients and excess volumes of mixing of some organic liquids, specifically of binary systems involving the ... -
Oxidation of Alcohols
Oxidation of ethanol and methanol are known to be feasible reactions. Equilibrium constants calculated show that these reactions are highly irreversible. Theoretically ethanol and methanol oxidations to their respective ... -
Modeling of Coalescence Cascades in Liquid-Liquid dispersions
Agitated dispersions of one liquid in another immiscible liquid invert at a critical value of dispersed phase fraction, nearly catastrophically. The dispersed phase becomes continuous and vice versa. This phenomenon has ... -
Studies in gas-solid reactions
Non-catalytic gas-solid reactions are of great industrial importance and have therefore attracted considerable research effort. As a result, a number of models have been proposed in literature. Among the early models, the ... -
Polysterene-based compatibilizers for polymer blending : main chain epoxidation of high molecular weight polystyrene
Polystyrene has often been functionalized for its use in various commercial applications, but most often the reactive functional groups have been substituted on its benzene ring. In the present work, epoxy functional groups ...