etd AT Indian Institute of Science: Recent submissions
Now showing items 501-520 of 8174
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Triphenylphosphazenyl-cyclotriphosphazenes and bicycle phosphazenes
The work presented in this thesis consists of two parts. The first part deals with the preparation of (triphenylphosphazenyl)pentachlorocyclotriphosphazene, N?P?Cl?(NPPh?) and its reactions with primary and secondary amines. ... -
Thermal studies on polymers and propellants
This limited pyrolysis study of three commercial carboxy-terminated polybutadienes used in present-day propellant industry was conducted to gain some information on their kinetics and mechanism of decomposition in inert ... -
Physico-chemical studies on Deoxyoligoyuanlic acids and their complexes with Polyribocytidylic acids
Venom and spleen exonuclease are capable of cleaving guanosine oligonucleotides when they are not aggregated. At 22°C, in presence of sodium ions aggregation is rapid even at 0.5 × 10?? M concentration. On the other hand, ... -
Study of vibrational spectra and donacity of some sulphur-nitrogen compounds containing; thiocarbonyl grouping
The infrared and Raman spectra of 1,3,4,6-tetrahydropyrimidine-2-thione (tpt) and -2-one (tpo) are studied. The infrared spectra of oriented polycrystalline samples of tpt and imidazolidine-2-thione (ethylenethiourea, etu) ... -
Studies on the polymerisation of acrylonitrile
The thesis contains the results of the investigations on the kinetics and mechanism of polymerization of acrylonitrile. It is divided into two parts: the first part deals with the initiation of polymerization by ferric ... -
Adsorption of cyclohexanone and its effect on the polarographic reduction of different ions
As a contribution towards the effect of adsorption on electrode kinetics, the adsorption of cyclohexanone and its effect on the polarographic reduction of different ions have been investigated. In Chapter 1 of the thesis, ... -
Theoretical study on intermolecular interactions in the formation of aromatic hydrocarbon dimers
The interaction between two closely lying and parallel aromatic hydrocarbon molecules, one of which is in its singlet excited state and the other in its ground state, leading to the formation of singlet excimers, is now ... -
Enhancing Therapeutic Potential of Antimicrobial Peptides by Tuning Backbone Conformation
Full text embargo up to Dec 31, 2026 The work reported in this thesis involves tuning the backbone conformation of b-hairpin AMPs to reduce their cytotoxicity, which is determined in terms of reduced hemolytic activity, ... -
Development of certain photothermal wave techniques and investigations on the thermal properties of Al20 ASx Te80-x glasses
A novel photoacoustic methodology has been developed using rear-surface illumination of samples in the thermally thick regime. The method relies on obtaining the phase data of the normalized signal to measure the thermal ... -
Local structure and transport properties of chalcogenide glasses
The study o f the structure and properties o f disordered materials continues to be a topic o f interest in condensed matter physics. Glassy semiconductors, in particular, chalcogenide glasses have been important ... -
Development of Specialised Tribometer for Advanced Tribosystem Evaluation
This thesis presents a comprehensive study on the development and validation of force-controlled tribometers to accurately evaluate tribo-contacts under realistic test conditions. The research addresses the gap in conventional ... -
Asymmetric Catalysis: From Atroposelective Organocatalysis to Iridium-Catalyzed Generation of Central Chirality
Thesis Abstract: This thesis, entitled as “Asymmetric Catalysis: From Atroposelective Organocatalysis to Iridium-Catalyzed Generation of Central Chirality” is divided into three chapters. Chapter 1, highlights the ... -
Interplay of Performance and Robustness in Architected and Naturally Evolved Structures
Humans have long drawn inspiration from nature, drawing on its intricate and efficient designs for solving complex engineering challenges. One such feature is the aperiodicity observed in biological systems, which exhibit ... -
Experimental investigations into tensile properties of large specimens and sensitivity of notch size on the fracture and fatigue behavior of concrete
Full text embargo upto Jan 15, 2027 Concrete, which is the second largest material used after water, is a highly heterogeneous quasi-brittle material containing ingredients at different length scales. The fracture and ... -
Control and Co-ordination in Multi-Joint Movements
Our interactions with the world often entail a wide range of multi-jointed movements. We are bestowed with an abundant degree of freedom, that a movement can be achieved by recruiting multiple joints, muscles, and neural ... -
Space- Time block codes with low maximum likelihood decoding complexity and large coding gain
Space-time block coding has been an extensively researched technique to combat multipath fading in multiple-input, multiple-output (MIMO) systems when the channel-state information is available at the receiver but not at ... -
Theoretical study of surface wave characteristics of a circular cyclindrical conductor coated with 2 graded dielectric layers embeoded in isotropic & anisotropic media
The study investigates a cylindrical conductor coated with two dielectric layers, both having radially varying dielectric constants, and the external medium being lossless, either: (a) Isotropic, or (b) Anisotropic The ... -
Non linear vibrations of stretched strings
The viscosity of pure Freon-12 and Freon-22 vapours and their mixtures has been determined by an oscillating disc viscometer at room temperature and pressure. The results agree well with the published data for the pure ...