Browsing Department of Physics by Issue Date

Case Studies Of The Circular Restricted Three Body Problem

Eberle, William Jason (Physics, 2007-08-23)

In this thesis, the onset of instability for a planet which is part of a stellar binary system is investigated by running numerical simulations of the circular restricted three body problem. This study also makes use of a ...

Derivation Of Generalized Lorenz Systems To Study The Onset Of Chaos In High Dimension

Roy, Dipanjan (Physics, 2007-08-23)

This thesis provides a new method to derive high dimensional generalized Lorenz systems. Lorenz system is a celebrated nonlinear dynamical dissipative system which was originally derived by Lorenz to study chaos in weather ...

A First-principles Study On The Enhancement Of Beryllium Doping In Gallium Nitride

Wang, Xiao (Physics, 2007-08-23)

The excellent physical and electrical properties of Gallium Nitride (GaN) have made it a good candidate in light-emitting diodes and UV detecting semiconductor materials. However, GaN's p-type doping has long been a ...

Synthesis And Characterization Of Magnetic Nanoparticles

Poudyal, Narayan (Physics, 2007-08-23)

Synthesis of uniform nanoparticles (<100 nm) of hard and soft magnetic materials have attracted much attention in the last two decades because of their unique magnetic properties and potential for many applications such ...

Study Of Oxide Surfaces Using Time Of Flight Positron Annihilation Induced Auger Electron Spectroscopy

Nadesalingam, Manori Prasadika (Physics, 2007-08-23)

Transition metal oxides (TMOs) exhibit a rich collection of interesting and intriguing properties which can be used for wide variety of applications. In this dissertation, I will discuss the first PAES measurements on ...

Preparation And Characterization Of Hard Magnetic Nanoparticles

Li, Daren (Physics, 2007-08-23)

Hard-magnetic nanoparticles with uniform size distribution have attracted huge attention in the past several years because of their unique magnetic properties and potential for many applications such as high density recording ...

Conditions For Wave Propagation Along Solar Magnetic Flux Tubes

Routh, Swati (Physics, 2007-08-23)

There is an intimate relation between all aspects of the solar activity and the presence of solar magnetic fields. Observations showed that the magnetic field at the photospheric level consists of magnetic flux tubes, which ...

Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles

Rong, Chuan-Bing; Poudyal, Narayan; Chaubey, Girija Shankar; Nandwana, Vikas; Skomski, R.; Wu, Y.Q.; Kramer, Matthew J.; Liu, J. Ping (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2007-08-30)

FePt nanoparticles with a size of 3 nm and thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles were prepared by chemical synthesis and a salt-matrix annealing technique. ...

AlfvÉnic Accelerated Electrons And Short Burst Auroral Kilometric Radiations Observed By The Fast Satellite

Ma, Lun (Physics, 2007-09-17)

This investigation is motivated by previous study of short burst radiations (S-bursts) reported by Ergun et al. [2006], who suggested two generation mechanisms of S-bursts: one is the electron cyclotron maser instability ...

First Direct Measurement Of The Energy Spectra Of Individual Auger Cascade Steps In Solid MnO, Ag And Pd

Sundaramoorthy, Rajalakshmi (Physics, 2007-09-17)

We present the first direct measurements of energy spectra of electrons emitted in the later steps of the Auger cascade processes in solids. Measurements were carried out for the L-->MV-->VVV and L-->MM-->MVV-->VVVV Auger ...

Quartic: An Ultra-fast Time-of-flight Counter

Duarte, Pedro Miguel (Physics, 2007-09-17)

Fast time-of-flight counters are planned to dramatically decrease backgrounds to events with a massive central system and forward/backward protons at the LHC. By using timing to confirm that the protons originated from the ...

High thermal stability of carbon-coated L10-FePt nanoparticles prepared by salt-matrix annealing

Nandwana, Vikas; Rong, Chuan-Bing; Poudyal, Narayan; Chaubey, Girija S.; Liu, Yuzi; Wu, Y.Q.; Kramer, M.J.; Kozlov, M.E.; Baughman, Ray H.; Liu, J. Ping (AIP, 2008)

Monodisperse L10-FePt nanoparticles with size ranging from 3 to 8 nm were prepared by the salt-matrix annealing method. It was observed that the annealed particles have high thermal stability—no sintering occurred even ...

First-principles prediction of enhanced magnetic anisotropy in FeCo alloys

Wu, Dangxin; Zhang, Qiming; Liu, J. Ping; Yuan, Dingwang; Wu, Ruqian (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2008-02-04)

The structural, electronic, and magnetic properties of FeCo alloys were studied by first-principles calculations. It has been found that the alloys prefer chemically noncubic geometries in a wide composition range. This ...

High thermal stability of carbon-coated L1[subscript]0-FePt nanoparticles prepared by salt-matrix annealing

Rong, Chuan-Bing; Poudyal, Narayan; Chuabey, Girija S.; Nandwana, Vikas; Liu, Yuzi; Wu, Y.Q.; Kramer, Matthew J.; Kozlov, Mikhail E.; Baughman, Ray H.; Liu, J. Ping (Institute of Applied PhysicsDepartment of Physics, The University of Texas at Arlington, 2008-02-08)

Monodisperse L10-FePt nanoparticles with size ranging from 3 to 8 nm were prepared by the salt-matrix annealing method. It was observed that the annealed particles have high thermal stability—no sintering occurred even ...