Physics (PHY): Recent submissions
Now showing items 241-260 of 763
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Electrical resistance and dielectric constant studies in a binary liquid system in the critical region
This thesis presents an experimental investigation of electrical resistance and dielectric constant anomalies in a critical binary liquid system (the polar + non-polar mixture methanol + cyclohexane). Since the critical ... -
Mass Spectrometric Studies of K39/K41 & Li7/Li6 abundance variations in synthetic and natural samples
This thesis embodies a systematic investigation on the abundance variation of and Li^6/Li^7 ratios in synthetic and natural samples by mass spectrometric technique. The measurements of ratios were carried out with a 10", ... -
Investigations in nuclear magnetic resonance
This thesis describes the investigations carried out by the author in nuclear magnetic resonance, a subject which has shown a phenomenal expansion both in experimental techniques and in the range of applications in the ... -
Chlorine and bromine NQR investigations of certain cyclophosphazenes
This thesis describes the work carried out by the author on the Nuclear Quadrupole Resonance in certain chloro- and bromo-cyclophosphazene derivatives. The work can be divided into two parts: Development of NQR ... -
EPR study of the phase transitions in LIKSO4 and certain similar salts.
This thesis represents basically an attempt to investigate the low temperature phase transitions of LiKSO^ (LKS) through Electron Paramagnetic Resonance (EPR). There have been of course umpteen publications on the ... -
Electron spin resonance studies in crystals
This thesis embodies the results of the investigations carried out by the author on the electron spin resonance of some of the iron group transition metal ion complexes in order to elucidate the nature of metal-ligand ... -
Investigations in nuclear magnetic resonance
This thesis describes the work carried out by the author on single crystals of certain hydrated metal organic compounds, using the technique of wide-line nuclear magnetic resonance (NMR). The principal aim of ... -
Interplay of disorder and superconductivity in ultra-thin Sn films
This thesis reports low-temperature, in-situ transport measurements on quench-condensed ultra-thin films of Sn. Film thicknesses are < 100 Å. These films exhibit an insulator-to-superconductor transition. Novel effects are ... -
Generalized light rays and relativistic front dynamics : theory and application to paraxial optics
We recount here briefly the main advantages of using the front form for paraxial wave problems. It leads to a clean separation of the space-time variables into the combinations on each of which the amplitude has a ... -
Study of coupled spin systems by flip-angle dependent one and two-dimensional NMR experiments
Flip-angle effects of the RF pulses on systems in non-equilibrium states are studied in detail for three different systems oriented in liquid crystalline phase ZLI-1167. It is shown that in the non-linear regime the effect ... -
Spatiotemporally chaotic states of some Nonequilibrium systems
We have carried out the most extensive numerical study of model (1), especially with a view to elucidating the nature of its statistical steady states and transitions between them. Our work is guided by studies of phase ... -
Role of inverse cascade in astrophysical turbulence
This thesis is an attempt to blend the latest observations of large-scale coherent motions-coherent structures-observed in experiments with turbulent fluids [6], with different astrophysical situations where turbulent flow ... -
A Synthesis study of the radio sky at decametre wavelengths.
This thesis describes an all-sky survey made at 34.5 MHz using the low frequency telescope situated at Gauribidanur, near Bangalore (latitude 13.36 12 N). The antenna system is made up of 1000 dipoles arranged in the ... -
Characterization, properties and dynamics of squeezed states: single mode and multimode systems
Squeezed states of the quantized electromagnetic field, as well as the squeezing phenomenon in the more general quantum mechanical context, have been topics of enormous interest recently. In addition to a very large number ... -
Wide-line and pulsed NMR instrumentation and investigations in certain Hydrazinium metal halides.
This thesis describes the wide-line and pulsed NMR instrumentation and investigations in certain hydrazinium double salts. Proton second moment and proton spin-lattice relaxation time as a function of temperature in the ... -
NMR spectroscopy of oriented systems: studies at and near magic angle sample spinning
The experiments described in this chapter are important in the context of applications mentioned in section 2.2, viz., (i) analysis of spectra of oriented molecules and (ii) use of liquid crystals for measurement of spinning ... -
Theoretical and experimental studies on open circuit voltage decay lifetime and series resistance in solar cells and other P-N junction devices
Open-Circuit Voltage Decay (OCVD) is a simple and widely used technique for determining the minority carrier lifetime (??) in p–n junction devices. In this work, theoretical expressions for both Forward Current-Induced ... -
Theoretical studies on some classical and quantum transport problems in random media
The problem of transport of charge (electrons, holes and ions) and energy (excitons) in a dynamically disordered medium is assuming increasing significance in recent times, from theoretical and experimental viewpoints. ... -
Studies on the raman spectra of crystals (PHY)
The Raman spectra of crystals have formed a very fruitful topic of study in the past and such studies, particularly on single crystals in specific orientations, have contributed in a large measure to a better understanding ...