Oklahoma State Physics Department
Seminars and Colloquia
August through December, 1994
(updated October 21, 1994)
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Seminars and Colloquia, Typical Week:
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Date:      Thursday
Time:      1:30 PM
Place:     Classroom Building, Room 106
Inquiries: physmas@mvs.ucc.okstate.edu
           physsna@mvs.ucc.okstate.edu
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Physics Colloquium:
Date:      Thursday
Time:      3:30 PM
Place:     PS 110
Inquiries: jhhp@jperk.phy.okstate.edu
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Date:      Friday
Time:      2:00 PM
Place:     PS 147
Inquiries: jhhp@jperk.phy.okstate.edu
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Oklahoma State Physics Department
Seminars and Colloquia, August 22-26, 1994
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Physics Colloquium:

Speaker: Dr. Michael A. Stroscio
         Director, U.S. Army Research Office
Date:    Thursday, August 25
Time:    3:30 PM
Place:   PS 110
Title:   Confined and Interface Optical and
         Acoustic Phonons in Quantum Wells
         and Quantum Wires 
Refreshments served at 2:45 PM, 4th Floor of
Noble Research Center (Welcome Get-together)
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Oklahoma State Physics Department Seminars
and Colloquia, August 29-September 2, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Patrick Skubic
         University of Oklahoma
Date:    Thursday, September 1, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Highlights of DPF 1994
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Physics Colloquium:

Speaker: Dr. Jacques H. H. Perk
         Department of Physics, OSU
Date:    Thursday, September 1, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Star-Triangle Equations
         for Pedestrians

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Star-Triangle Equations were first introduced
in 1899 to understand questions about the
design of electric power generators and
Wheatstone bridges. They provide a powerful
simple algorithm for calculations in linear
electric networks. In the twenties such
algorithms were also introduced as Reidemeister
moves in the mathematical theory of knots. In
1944 they appeared for the first time in
statistical mechanics and in 1964 in quantum
field theory. Now they are commonly known as
Yang-Baxter Equations and are widely used in
mathematics and physics, especially when there
is an underlying "quantum group," or "solitons"
in the classical limit. In this talk, we shall
discuss principles and applications with a
minimum of mathematics.
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Oklahoma State Physics Department Seminars
and Colloquia, September 5-9, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Not scheduled
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Physics Colloquium:

Speaker: Dr. James P. Wicksted
         Department of Physics, OSU
Date:    Thursday, September 8, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Raman Spectroscopic Studies
         of Metabolic Concentrations
         in Aqueous Solutions

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Individual concentrations of glucose,
lactic acid, and urea down to 0.1 wt. %
have been investigated in aqueous solutions
using the Raman scattering technique.
These measurements have been conducted
using several different laser wavelengths
in conjunction with a grating spectrometer
and a liquid nitrogen cooled CCD. Rabbit
and human aqueous humor specimens were
also studied whereby Raman structure
similar to the stretching vibrational
modes of methylene and methyl groups,
associated with glucose and lactate,
were observed. The potential application
of this technique for measuring, in vivo,
metabolic concentrations within the eye
will be discussed.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Sheng Xu
         Department of Physics, OSU
Date:    Friday, September 9, 1994
Time:    2:00 PM
Place:   PS 147
Title:   Theoretical Study of
         Off-Center D^0 and D^- States
         in Quantum Wells
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Oklahoma State Physics Department Seminars
and Colloquia, September 12-16, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Satya Nandi
         Department of Physics, OSU
Date:    Thursday, September 15, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Top Quark Dynamics
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Physics Colloquium:

Speaker: Dr. H. M. Badran
         Department of Physics, OSU,
         and Tanta University (Egypt)
Date:    Thursday, September 15, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Ultra-High Energy
         Gamma Ray Astronomy

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Although cosmic rays were discovered as
early as 1912 through the balloon flights
of Hess (1912) which led to establish that
cosmic rays originate outside the Earth's
atmosphere, they still pose many unanswered
questions, especially about their nature at
high energies and their origin. In fact,
even their name, cosmic rays, is a misnomer
because the entities themselves are not
'rays' on the whole; they are nuclei of
various kinds, rather than electromagnetic
waves.
  Observations of cosmic rays are grouped
into three categories: energy spectrum,
mass composition, and anisotropy. Only
recently, the first identification of a
cosmic ray source in ultra high energy
(>10^15 eV) has been achieved by the Kiel
group [Samorski & Stamm, Ap. J. Lett., 268,
L17, 1983], through their detection that
Cyg X-3 emits pulsed gamma-rays. Since
this identification many new arrays with
improving angular resolution have been
built or are under construction to
identify the sources of Ultra High Energy
radiation and to study the nature of the
interaction of this radiation with matter.
One of the most important new experiments
is the HEGRA (High Energy Gamma Ray Array)
air shower array, which is located on the
top of the Roque de los Muchachos at the
Canary Island La Palma, Spain.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Not Scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, September 19-23, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Cancelled
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Physics Colloquium:

Speaker: Dr. Timothy M. Wilson
         Department of Physics, OSU
Date:    Thursday, September 22, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Site Dependence of the Electronic
         Structure of 3d Transition Row
         Substitutional Impurities in
         Ionic Crystals

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Transition metals in general are an
important class of impurities in ionic
insulators and semiconductors. The 3d ion
substitutional impurities form deep trap
levels and have open 3d shell configurations
which are characterized by intra-center d->d
optical transitions between atomic-like core
states that are perturbed by the crystal
field arising form the surrounding lattice.
The transition metals in general often
exhibit variable valency when acting as
substitutional impurities. The results of
Multiconfigurational SCF calculations for
CaF_2:Mn and alpha-SiO_2:Fe will be used
to show the important differences in the
electronic structure of octahedrally and
tetrahedrally bonded substitutional 3d
ions. 
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Special Colloquium on Nonlinear Optics:

Speaker: Dr. Nickolai V. Kukhtarev
         Alabama A&M University
         Huntsville, Alabama
Date:    Friday, September 23, 1994
Time:    1:30 PM
Place:   Noble Research Center, Room 107
Title:   Nonlinear Optics of
         Photorefractive Materials:
         Physics & Applications

Topics to be discussed include:
Channeling of light by phase gratings,
visualization of the IR images, photo-EPR,
hexagonal scattering in KNbO_3:Fe, and
the use of photorefractive materials for
dynamic holography and optical data storage.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Postponed one week, because of
Special Colloquium on Nonlinear Optics
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Oklahoma State Physics Department Seminars
and Colloquia, September 26-30, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Mark A. Samuel
         Department of Physics, OSU
Date:    Thursday, September 29, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Estimating Coefficients in
         PQFT --- An Update
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Physics Colloquium:

Speaker: Dr. Peter O. Shull
         Department of Physics, OSU
Date:    Thursday, September 29, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Advanced Placement Physics
         by Satellite, or
         The Mysteries of PS 151

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

AP Physics by Satellite is beamed live
from OSU's campus television studios to
high schools situated everywhere from
Alaska to Massachusetts.  Now in its
ninth year, this comprehensive course
in algebra-based physics has reached 5000
students. I will describe the course,
its effectiveness, and the insights it
provides into American schools today.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Dr. Wei Shan
         Department of Physics, OSU
Date:    Friday, September 30, 1994
Time:    2:00 PM
Place:   PS 147
Title:   Study of Properties of
         Semiconductors under
         High Pressure
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Oklahoma State Physics Department Seminars
and Colloquia, October 3-7, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Cancelled
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Physics Colloquium:

OSU Fall Break Weekend
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Dr. Sergey V. Kravchenko
         Department of Physics, OU
Date:    Friday, October 7, 1994
Time:    2:00 PM
Place:   PS 147
Title:   Metal/insulator transition
         in two dimensions at zero
         magnetic field ?
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Oklahoma State Physics Department Seminars
and Colloquia, October 10-14, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Cancelled!
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Physics Colloquium:

Speaker: Dr. William D. Cochran
         McDonald Observatory
         University of Texas at Austin
Date:    Thursday, October 13, 1994
Time:    3:30 PM
Place:   PS 110
Title:   The Great Train Wreck:
         The Impact of the Comet
         Shoemaker-Levy 9 on Jupiter

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Dr. Jin Fu Zhou
         Department of Physics, OSU
Date:    Friday, October 14, 1994
Time:    2:00 PM
Place:   PS 147
Title:   Aggregation of
         Indocyanine Green
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Oklahoma State Physics Department Seminars
and Colloquia, October 17-21, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Per Bak
         Brookhaven National Laboratory
Date:    Thursday, October 20, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Self-Organized Criticality
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Physics Colloquium:

Speaker: Dr. Kieran Mullen
         Department of Physics, OU
Date:    Thursday, October 20, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Superhexatics:
         The Spatial Ordering of
         Helium in Superfluid Films

POSTPONED!

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Helium films have been a source of
interesting physics, including
two-dimensional melting, wetting
phenomena, and superfluidity.
Although one of the simplest systems,
it still contains new surprises.
Recent experiments on superfluid films
have shown a variety of unexpected
behaviors, such as submonolayer
superfluidity and anomalous phase
transistions. These experiments have
prompted theories of new, highly
ordered, superfluid states, such
vortex-antivortex lattices and
superhexatics. This colloquium will
discuss some of the new physics
of helium films, review the
Kosterlitz-Thouless (KT) theory of
two-dimensional melting, and finally
discuss how KT theory might be
generalized to cover recent experiments.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Dr. Xincheng Xie
         Department of Physics, OSU
Date:    Friday, October 21, 1994
Time:    2:00 PM
Place:   PS 147
Title:   Electron Localization
         in a 2D System with
         Random Magnetic Flux
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Oklahoma State Physics Department Seminars
and Colloquia, October 24-28, 1994
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Special Chemistry and Physics Seminar:

Speaker: Dr. Janos Ladik
         Lehrstuhl fur Theoretische Chemie, 
         University of Erlangen at Nuremberg
Date:    Tuesday, October 25, 1994
Time:    3:30 PM
Place:   Noble Research Center, Room 108
Title:   Theory of Non-Linear Optical
         Properties of Polymers

Coffee and cookies 3:00-3:30 4th floor NRC.
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Doug McKay
         University of Kansas
Date:    Thursday, October 27, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Gauge-Coupling and the
         Minimal SUSY Model:
         The Fourth Generation
         Below the Top?
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Physics Colloquium:

Speaker: Dr. Krishan K. Bajaj
         Dept. of Physics, Emory University
Date:    Thursday, October 27, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Excitons in Semiconductor
         Quantum Confined Structures

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

In this talk we will review the properties
of excitons in semiconductor quantum
confined structures such as quantum wells,
wires and dots in the presence of applied
electric and magnetic fields. We will
briefly describe the results of recent
calculations of exciton binding energies
and oscillator strengths and compare them
with the available experimental data.
Application of some of these studies to
opto-electronic devices will be discussed.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Not scheduled in view of Tuesday talk.
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Oklahoma State Physics Department Seminars
and Colloquia, October 31-November 4, 1994
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Special Chemistry and Physics Seminar:

Speaker: Dr. Dale W. Schaefer
         Sandia National Laboratory
         and U.S. Department of Energy
Date:    Tuesday, November 1, 1994
Time:    3:30 PM
Place:   Noble Research Center, Room 108
Title:   New Routes to Nanostructure
         Materials: Microphase Separation

Coffee and cookies 3:00-3:30 PM in 
NRC Room 207 (Foyer).

Dr. Schaefer's principal research
interests are colloids, polymers,
and composite materials.
A current special interest is the
structure and properties of hybrid
inorganic-organic polymeric materials,
which he studies extensively by
scattering techniques.
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Special Physics Colloquium:

Speaker: Dr. Nicolaas Bloembergen
         Nobel Prize Winner in 1981
Date:    Wednesday, November 2, 1994
Time:    3:00 PM
Place:   Noble Research Center, Room 106
Title:   Science and Society
         in the 21st Century

Refreshments served before Colloquium on
4th Floor of Noble Research Center,
at 2:00 PM. Reception in Suite 1600 of
the Student Union, 5:00 PM - 7:00 PM.

Abstract:

The largest scientific and technological
issues facing mankind include human
population growth rate, decrease of
biological diversity, quality of the
atmosphere, oceans, and forests, and
disarmament. Positive and negative
influences of technological developments
will be discussed.
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Special Physics Colloquium:

Speaker: Dr. Nicolaas Bloembergen
         Nobel Prize Winner in 1981
Date:    Thursday, November 3, 1994
Time:    10:00 AM
Place:   Center for International Trade
         Development (CITD), Room 110
Title:   Laser-Material Interactions:
         Fundamentals and Applications

Abstract:

The interaction of light with matter
leads to electronic excitation by the
absorption of photons. A large fraction
of the high excitation energy of the
electrons is transformed into heat on a
time scale of about one picosecond in
many circumstances. With lasers, power
flux densities or intensities exceeding
a terawatt/cm^2 are readily achieved
and any material may be converted into
a high temperature plasma. The material
response has been investigated over
a wide range of intensities and
irradiation times. Applications include
heat treatment and ablation of surfaces,
cutting, drilling, and welding of a wide
variety of materials, laser recording
and printing, and laser surgery.
Phase transitions induced by ultrashort
femtosecond laser pulses enlarge our
understanding of materials under extreme
conditions of pressure and temperature.
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Bijan Nemati
         Department of Physics, OU
Date:    Thursday, November 3, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Recent Results from CLEO
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Not scheduled in view of Tuesday talk.
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Oklahoma State Physics Department Seminars
and Colloquia, November 7-11, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Mark Rakowski
         Institute of Theoretical Physics
         Dublin, Ireland
Date:    Thursday, November 10, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   State Sum Models and
         Simplicial Cohomology
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Physics Colloquium:

Speaker: Dr. Ponnada A. Narayana
         Department of Radiology
         University of Texas at Houston
Date:    Thursday, November 10, 1994
Time:    2:45 PM (Note Earlier Start!)
Place:   PS 110
Title:   Magnetic Resonance
         Spectroscopic Imaging

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 2:30 PM
(note change of time). Also, at 11:30 AM
in PS 147, a presentation by Dr. Narayana
is scheduled (sponsored by The Society of
Physics Students) about careers in medical
physics and medical school opportunities
at the University of Texas at Houston.

Abstract:

Since its introduction about twenty years
ago into the clinical arena, magnetic
resonance imaging (MRI) has rapidly become
the modality of choice for visualizing
central nervous system (CNS) diseases.
While tissue pathology can be visualized
with exquisite details, the MRI findings
remain qualitative and nonspecific. In
addition to generating superb anatomical
images, it is also possible to map the
biochemical distribution in the brain
utilizing magnetic resonance. Such maps,
generally known as spectroscopic images,
have the potential to be disease-specific
and provide quantitative information.
For spectroscopic imaging (SI) to become
a routine clinical tool, a number of
technical obstacles have to be overcome.
These include pulse sequence design for
faster and robust data acquisition,
automatic data processing techniques,
etc. In this presentation, the basic
concepts of SI will be reviewed and the
technical challenges for making SI a
routine clinical tool will be discussed.
Finally, some recent progress made in SI
and its application to both normal and
diseased brain will be presented.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Speaker: Xiaoping Cai
Date:    Friday, November 11, 1994
Time:    2:00 PM
Place:   PS 147
Title:   RHEED Theory and its
         Application in MBE
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Oklahoma State Physics Department Seminars
and Colloquia, November 14-18, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Cancelled
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Physics Colloquium:

Speaker: Dr. Paul Devlin
         Department of Chemistry, OSU
Date:    Thursday, November 17, 1994
Time:    3:30 PM
Place:   PS 110
Title:   Nature of the Molecular
         Mobility of Ice at
         Temperatures below 150 K

Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.

Abstract:

Several processes, including the growth
of crystalline ice from either the vapor
or amorphous phase at temperatures in
the 100 - 150 K range, require rapid
condensed-phase structural relaxation.
Since these temperatures are presumably
too low for translational molecular
diffusion to occur in ice, we are
examining the possibility that rotational
diffusion catalyzed by orientational point
defects is the source of the molecular
mobility. Isotopic exchange methods of
measurement of point defect activities
developed in our laboratory will be
examined, along with results that relate
to the question of structural relaxation.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Not scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, November 21-25, 1994
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Thanksgiving Week
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Oklahoma State Physics Department Seminars
and Colloquia, November 28-December 2, 1994
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: Dr. Ron Kantowski
         Department of Physics, OU
Date:    Thursday, December 1, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   Inhomogeneities and q_0
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Physics Colloquium:

Cancelled and Postponed till next Semester
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Cancelled and Postponed till next Semester
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Oklahoma State Physics Department Seminars
and Colloquia, December 5-9, 1994
------------------------------------------
Oklahoma High Energy Physics Seminar
on Talk-Back Television:

Speaker: TBA
Date:    Thursday, December 8, 1994
Time:    1:30 PM
Place:   Classroom Building, Room 106
Title:   TBA
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Physics Colloquium:

Not Scheduled ("Dead Week" before Finals)
Also cancelled in view of
Dean's Office Christmas Open House
Thursday, December 8, 1994, 3:00-4:00 PM
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):

Cancelled in view of
Annual Physics Department Christmas Party
Friday, December 9, 1994, 2:30-4:30 PM
in Room PS 147.
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Oklahoma State Physics Department Seminars
and Colloquia, December 12-16, 1994
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Finals Week: No seminars scheduled
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Noble Center for Laser Research,
Annual Xmas Party, Room NRC 413,
Thursday, December 16, 1994, 3:00-5:00 PM
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Oklahoma State Physics Department Seminars
and Colloquia, December 19-23, 1994
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Special Physics Colloquium:

Speaker: Dr. S. Lori Bridal
         Department of Physics
         Washington Univ. (St. Louis)
Date:    Thursday, December 22, 1994
Time:    2:00 PM
Place:   PS 110
Title:   Ultrasonic Acoustic Microscopy:
         Broadband Ultrasonic Investigations
         of Inhomogeneous, Anisotropic Media

Reception for Lori to follow about 3:00 PM.
Lori (BS, Physics OSU) has just completed
her PhD in Physics at Washington University
under the direction of Professor Jim Miller.
Her talk is based upon part the research
undertaken for her dissertation. Lori is
home in Oklahoma for a few days before
leaving at the end of December to take up
a Research Fellowship at the Sorbonne.
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Oklahoma State Physics Department Seminars
and Colloquia, December 26-30, 1994
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Christmas Break: No activities scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, January 2-6, 1995
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No activities in view of
Graduate Student Preliminary Exams:
January 2, 3, 5, 6, 1995
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