Division of Physical and Mathematical Sciences
Recent Submissions
-
Symmetry breaking and singularity-free cosmology
The origin and the nature of the universe has intrigued the human mind since time immemorial. Till the beginning of this century, lack of observational data and the absence of a consistent theory of gravitation had precluded ... -
Some exact analytic models of time dependent collisionless stellar systems.
This thesis began with the general theme of studying the time-dependent behavior of collisionless self-gravitating systems. It is rather hard to obtain exact, general results by analytical methods (see Mathur 1986 for an ... -
Experimental investigations on metal-insulator transition and structure in amorphous carbon films
Conductivity of carbon films prepared from TCPA at pyrolysis temperatures of 700°C, 800°C, and 900°C was measured by varying the temperature between 1.4 K to 300 K. To study the effect of substrates, films were deposited ... -
Reactive diffusion in AI/Ge multilayers
It may be mentioned in this context that there is no evidence of the hexagonal and orthorhombic phase reported in e-beam annealed amorphous Al-Ge films in the present investigations. It is also interesting to note that the ... -
Nonlinear analysis of lower hybrid by many-body techniques
In some recent experiments, intense ion heating has been observed. This heating has been attributed to the excitation of the lower hybrid in the inhomogeneous magnetoactive plasma. The level of turbulence is observed to ... -
Some theoretical investigations on the flow of fluids with special reference to emulsions
The principal result of the analysis is that a localized reduction in interfacial tension does lead to an interfacial instability. For small reductions, the interfacial growth is linear in t and proportional to W itself, ... -
Quasicrystals, rational approximants and quasicrystalline tilt boundaries : Theory and experiments
A range of NaBr concentrations (0.02 < X < 0.21) can be examined in an experimentally accessible (Tx - T) range, and there is good temporal stability in Tx also. The cloud point curves for different concentrations of NaBr ... -
Effects of disorder on interacting fermionic systems in one dimension
The work begins with constructing an XXX matrix whose diagonal elements represent the momenta of a classical NNN-particle system, while off-diagonal elements are odd functions of coordinates. Summing over rows of this ... -
Ground states, excitations, thermodynamics and exact results in various lattice systems
This thesis covers problems in a few different aspects of interacting many-particle systems on a lattice. The first problem is of a quantum dynamical system, and the rest are of quantum and classical magnetic systems. We ... -
Investigations concerning special critical points in multicomponent liquid mixtures
The key results of the present investigations [4] can be summarized as follows: Water behaves as a field variable and hence, as an effective substitute for pressure in exploring the coexistence surface of the system ... -
Pulsed neclear magnetic resonance investigations of certain proton conductors
In conclusion, we have assembled a pulsed field gradient spin-echo NMR spectrometer by interfacing a home-built microprocessor-based pulsed programmer and data acquisition system with imported RF units and an electromagnet. ... -
Equilibrium and nonequilibrium dynamics of dense liquids
Dense liquids do many interesting things: they freeze into crystals, and sometimes get trapped into glassy states along the way. Their behaviour becomes more unusual when they are driven far away from equilibrium, for ... -
Phasons,topological defects and dynamics in incommensurate matter
In this thesis, we derive some physical consequences of the existence of a phason mode in incommensurate materials. We consider two main examples of such materials-quasicrystals and the incommensurate twist grain boundary ...
RSS 1.0