TCU DEPARTMENT of PHYSICS and ASTRONOMY

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TCU Box 298840
Fort Worth, TX 76129
Phone: (817) 257-7375
Fax: (817) 257-7742
Email:physics@tcu.edu

This page maintained
by Kaoru Yoshida

Fall 2004 Seminar Information

Friday August 27 at 1:00 p.m. in SWR 357

Dissertation:

Cristian Pantea
Department of Physics and Astronomy
TCU

Diamond-Silicon Reaction Under High Pressure-High Temperature Conditions

Refreshments and the Dissertation Oral Examination will follow

Sponsor: Dr. Zerda

Friday September 17 at 2:00 p.m. in SWR 357

Pre-dissertation

Yuejian Wang
Department of Physics and Astronomy
TCU

Synthesis and Characterization of SiC Nanowires

Refreshments and the Dissertation Oral Examination will follow

Sponsor: Dr. Zerda

Friday October 22 at 2:00 p.m. in SWR 357

Dr. Gerhard Brauer
Institut für Ionenstrahlphysik und Materialforschung
Forschungszentrum Rossendorf
Germany

Slow positron implantation spectroscopy – a tool to characterize vacancy-type damage in ion-implanted 6H-SiC

Abstract: Positron Annihilation Spectroscopy (PAS), mainly in the form of Slow Positron Implantation Spectroscopy (SPIS), is used to study vacancy-type damage in ion implanted SiC. Thereby, the generation and use of monoenergetic positrons is essential as they serve as the tool to investigate depth dependant defect profiles caused by ion implantation. Physical information is derivable from the Doppler broadened annihilation lineshape, e.g. via the definition of characteristic lineshape parameters.
Basic physics behind the method will be explained and the derivation of a defect profile will be exemplified. Finally, several results on ion implanted SiC are presented. It is generally found that the vacancy-type damage formed is a function of substrate temperature during implantation and post-implantation annealing. In addition, a strong influence of the sequence of implantations on the vacancy-type damage formed is shown.

Sponsor: Dr. Quarles

Cecil and Ida Green Honors Chair in Physics, 2004

Dr. J. Robert Dorfman

Institute of Physical Science and Technology
University of Maryland
College Park, MD

Dr. J. Robert Dorfman
Institute of Physical Science and Technology
University of Maryland
College Park, MD

Wendnesday October 27, 3:00 p.m.
Sid W. Richardson Building, Room 357

Fractal Forms, Hydrodynamic Modes, and Non-equilibrium Entropy Production

Abstract: One of the most interesting developments in transport theory over the past several years has been the discovery of a number of formulae relating macroscopic transport coefficients to microscopic dynamical properties that describe the chaotic behavior of a fluid system. These relations follow from the properties of fractal functions that describe transport on a microscopic level. Some examples will be given and the connection between these fractals and the production of entropy in some diffusive flows will be discussed.

Refreshments before the presentation

 

Friday October 29, 2:00 p.m.
Sid W. Richardson Building, Room 357

Dynamical Chaos and Non-equilibrium Statistical
Mechanics: Is there a Connection?

Abstract: Most realistic, classical models of simple fluids exhibit the properties of dynamical chaos, in particular, exponential sensitivity to initital conditions. Moreover, most of these systems also exhibit irreversible, hydrodynamic behavior including relaxation to thermodynamic equilibrium states. The question naturally arises if there is any connection beween microscopic chaos and macroscopic relaxation to equilibrium. Here we show by means of some simple model system how (1) irreversible behavior can arise from reversible dynamics, and (2) how one might begin to understand the relaxation to equilibrium from the laws of mechanics. The role of chaotic dynamics will be discussed.

Refreshments before the presentation

Sponsor: Dr. Miller

For further information and directions to the campus call Department at 817-257-7375