THE BOSTON AREA PHYSICS CALENDAR
Week of April 21-April 27, 1996

The Boston Area Physics Calendar is published weekly during 
the academic year by the Department of Physics and Astronomy 
at Tufts University.  You may send your announcements by 
e-mail (bapc@tuhepa.phy.tufts.edu) or FAX:(617-627-3878).  
We cannot accept announcements by telephone.  Entries should 
reach us no later than 11:00am on the Monday preceding the week 
of the event. ENTRIES RECEIVED AFTER THE DEADLINE WILL NOT 
BE PUBLISHED.           
                
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Monday, April 22, 1996
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Monday, April 22, 1996,  2:00 p.m.
 
Massachusetts Institute of Technology
Monday Research Seminar 
Center for Theoretical Physics Seminar Room
Building 6, Third Floor
``Exact Energy Eigenstates for 2-d Black Holes''
GABOR KUNSTATTER
University of Winnipeg 
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Monday, April 22, 1996,  4:00 p.m.

Worcester Polytechnic Institute
Colloquium 
Olin Hall, Room 107
``Spectroscopic Investigations of Complex Systems: From 
a Photosynthetic Proton Pump to Leonardo da Vinci's Ginevra de' Benci''
JOHN DELANEY
NIH NRSA Postdoctoral Fellow
John Hopkins School of Medicine, Baltimore, MD 
Refreshments will be served in Olin 118 at 3:45 p.m.
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Monday, April 22, 1996,  4:30 p.m.

Brown University
Colloquium 
Barus & Holley 168
``Interlacing optical, condensed-matter, nuclear, particle, and
statistical physics''
PROFESSOR RUDY HWA
University of Oregon 
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Monday, April 22, 1996,  4:30 p.m.

Harvard University
Colloquium 
Jefferson Building, Room 250
``Super Cosmology''
PROFESSOR LISA RANDALL
Massachusetts Institute of Technology
Tea will be served in Jefferson 461 at 4:00 p.m. 
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Tuesday, April 23, 1996
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Tuesday, April 23, 1996,  12:00 noon

Massachusetts Institute of Technology
Rowland Institute for Science
Seminar on Modern Optics and Spectroscopy 
Ronald E. McNair Building
Marlar Lounge (37-252)
``Strong Field Quantum Control''
PHILIP H. BUCKSBAUM
University of Michigan 
Refreshments will be served following the Seminar.
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Tuesday, April 23, 1996,  2:30 p.m.

Brandeis University
Theoretical Seminar 
The Physics Building, Room 229
``Quantum Black Holes''
DR. GILAD LIFSCHYTZ
Brandeis University
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Tuesday, April 23, 1996,  2:30 p.m.

Massachusetts Institute of Technology
Joint Tufts--CfA--MIT Cosmology Seminar 
Center for Theoretical Physics Seminar Room
Building 6, Third Floor
``Bubble Collision and Defect Formation in a Damping 
Environment''
ANTONIO FERRERA
Tufts University
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Tuesday, April 23, 1996,  2:30 p.m.

Tufts University
Seminar 
The Science & Technology Center
Room 134
4 Colby Street, Medford
``101 tricks you can do with a linear accelerator-exploring
electroweak interactions with polarized beams''
DR. GUY BLAYLOCK
University of Massachusetts - Amherst
Refreshments will be served in Room 114 following the talk.
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Tuesday, April 23, 1996,  3:30 p.m.

Boston University
Dean S. Edmonds Sr. Lecture 
Room SCI-107, 590 Commonwealth Avenue
``Neurons, Computation and Earthquakes''
PROFESSOR J. HOPFIELD
California Institute of Technology
Refreshments will be served following the talk.
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Tuesday, April 23, 1996,  4:00 p.m.

Northeastern University
Center for Interdisciplinary
Research on Complex Systems (CIRCS)
CIRCS Seminars 
Room 114 Dana Building
``Formation of Structures in a Forest-Fire Model''
DR. BARBARA DROSSEL
Massachusetts Institute of Technology
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Tuesday, April 23, 1996,  4:15 p.m.

Massachusetts Institute of Technology
Astrophysics Colloquium 
The Marlar Lounge, Room 37-252
``Quasar Absorption Lines in a Universe with Cold Dark Matter''
PROFESSOR LARS HERNQUIST
UC Santa Cruz
Refreshments will be served at 3:45 p.m. 
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Wednesday, April 24, 1996
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Wednesday, April 24, 1996,  11:45 a.m.

Northeastern University

***** Diamond Anniversary Lectures *****

A series of ten pedigogical lectures
Lecture VII

114 Dana (Physics Department)
``Exactly Solvable Models in Statistical Mechanics''
DR. RODNEY J. BAXTER
Australian National University
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Wednesday, April 24, 1996,  4:00 p.m.

University of Massachusetts at Lowell
Spring Colloquia 1996 
Olney Room 428
``Origins of Baryons in the Universe''
PROFESSOR HAIM GOLDBERG
Northeastern University
Refreshments will be served at 3:30 p.m. 
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Wednesday, April 24, 1996,  4:30 p.m.

Massachusetts Institute of Technology
Joint Theory Seminar 
Center for Theoretical Physics Seminar Room
Building 6, Third Floor
``Top Color-Assisted Technicolor''
KEN LANE
Boston University
Refreshments will be served at 4:00 p.m. 
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Wednesday, April 24, 1996,  5:00 p.m.

Harvard University/Center for Astrophysics
Joint Atomic Physics Seminar
Jefferson Laboratory, Room 356
``What's Half-Cycle Pulse, Anyway?''
DR. PHILIP BUCKSBAUM
University of Michigan
Tea will be served at 4:30 p.m.
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Thursday, April 25, 1996
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Thursday, April 25, 1996,  10:30 a.m.

Harvard-Smithsonian Center for Astrophysics
Informal Seminar at Atomic and Molecular Physics Division 
Pratt Conference Room
``Parity and Time Invariance Violation in Atoms''
PROFESSOR NORVAL FORTSON
University of Washington-Seattle 
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Thursday, April 25, 1996,  12:00 noon

Boston University
Boston University Particles and Fields Seminar 
Physics Research Building
(3 Cummington St.), Room 593
``Recent Results on Top From D0''
DR. WILLIAM COBAU
University of Maryland
Please call 353-2600 one day in advance for parking.

The complete schedule is available at:
http://calvin.bu.edu/seminar.html 
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Thursday, April 25, 1996,  12:00 noon

Harvard University
Condensed Matter Theory Seminar 
Pierce 100F
``Phase Transitions, Metastability, and Nucleation in 
Earthquake Faults''
WILLIAM KLEIN
Boston University
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Thursday, April 25, 1996,  1:30 p.m.

Harvard University Division of Applied Sciences
Materials Science Seminar 
Gordon McKay Laboratory
David Turnbull Room 402
``Pulsed Laser Deposition: Energetic Rydberg State Atoms
and Their Impact on Film Growth''
PROFESSOR ROBERT LEUCHTNER
University of New Hampshire, Durham
 
Abstract:
 
        Pulsed laser deposited films often grow epitaxially on poorly
lattice-matched substrates and at low temperatures.  This mode of film
growth is not expected for condensation from a thermalized vapor; however,
laser ablation plumes are typically comprised of particles with large
kinetic energies as well as significant electronic excitation.  This
research focuses on long-lived excited state (Rydberg) atoms and ions
created by the laser ablation process and examines their role in film
growth, especially as it pertains to low temperature epitaxy.
 
        In this study, the kinetic and electronic properties of atoms and
ions in a laser-produced plasma from either Zn or ZnO targets were analyzed
using a time-of-flight quadrupole mass spectrometer (TOFQMS).  The TOFQMS
was also used to probe the ion-electron recombination process that leads to
the production of Rydberg state atoms.
 
        Deposition conditions were then chosen to help elucidate the
specific effects of electronic versus kinetic impact of the depositing
vapor.  ZnO films were prepared in an oxygen ambient from either the Zn
metal or the oxide target.  Comparisons of the resultant film morphology
and crystallinity will be presented in light of the differences in
electronic excitation within the plume from each target type.  The results
of this research suggest that long-lived Rydberg state atoms and ions in
the laser ablated vapor play an important role in low temperature epitaxial
film growth. 
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Thursday, April 25, 1996,  2:30 p.m.

Brown University
Theoretical Seminar 
Barus & Holley Building
Room 555
``Supersymmetric Gauge Dynamics and Singularities of 
4d  N=1 String Vacua''
PROFESSOR SHAMIT KACHRU
Harvard University
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Thursday, April 25, 1996,  3:00 p.m.

Harvard University
Special Seminars of the String Theory Group 
Jefferson Laboratory, Room 256
``Title: To Be Announced''
PROFESSOR SHELDON KATZ
Oklahoma University
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Thursday, April 25, 1996,  4:00 p.m.

Harvard-Smithsonian Center for Astrophysics
Scientific Colloquium 
60 Garden Street (Phillips Auditorium)
``Quasar Absorption Lines in a CDM Universe''
DR. LARS HERNQUIST
Lick Observatory
Univ. of California, Santa Cruz
 
Abstract:
 
Absorption lines in quasar spectra are believed to originate in
intervening gas at cosmological distances.  While the existence of a
Lyman-alpha "forest" of hydrogen absorbers has been recognized for 25
years, there is still no consensus about the detailed physical
properties of the absorbing material.  However, numerical simulations
made feasible by advances in computer technology have made it possible
to predict the nature of the absorbing gas by evolving representative
volumes of the Universe, including both dark and baryonic matter.
 
The simulations indicate that the traditional interpretation of the
origin of the lines--absorption by a smooth intergalactic medium
punctuated by discrete "clouds"--is incomplete in the context of a
model in which structure forms by gravitational instability.  Studies
of the properties of the absorbing gas in well-known cosmological
scenarios show that it is arranged in diverse states that are often
not in equilibrium, and whose geometrical configurations are
reminiscent of the large-scale structure seen in the distribution of
galaxies.  This new paradigm, in which the absorbing material is
arranged in "small-scale" structures, appears capable of reproducing
most observational characteristics of quasar spectra. 
 
Tea will be served at 3:30 p.m.
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Thursday, April 25, 1996,  4:15 p.m.

Massachusetts Institute of Technology
Colloquium 
MIT 10-250
``Visual Networks in the Brain''
PROFESSOR MRIGANKA SUR
Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology
 
Abstract:
 
What does it mean, to see?  What we do effortlessly involves an
array of brain processes, including transduction of light into electrical
activity in the retina, transmission of coded impulses from the retina to
visual centers of the brain, and analysis of stimulus features by a large
number of visual areas in the cerebral cortex.  Visual processing relies on
precise patterns of connections between neurons in each of these areas.  
These connections come about to a large extent by self-organization 
during brain development, but are continuously modified in the 
mature brain as well. 
 
Refreshments will be served in Room 26-110 at 3:45 p.m.
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Thursday, April 25, 1996,  4:30 p.m.
 
Brown University
Condensed Matter Seminar 
Barus & Holley Building
Room 751
``Lattice instabilities, anharmonicity and phase transitions in
perovskites''
PROFESSOR KARIN RABE
Yale University
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Friday, April 26, 1996
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Friday, April 26, 1996,  1:30 p.m.

Harvard University
Mathematical Physics Festival at 1:30, 3:00, 
and 4:30 p.m. 
Jefferson Laboratory, Room 462
``Negativity of the Wigner Distribution Function and
the Size of a Peculiar Quantum Effect''
PROFESSOR A. J. BRACKEN
University of Queensland, Australia
Tea will be served following the talk.
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Friday, April 26, 1996,  3:00 p.m.

Harvard University
Mathematical Physics Festival at 3:00 and 4:30 p.m. 
Jefferson Laboratory, Room 462
``Renormalization and Homogenization in Statistical Mechanics''
PROFESSOR T. SPENCER
School of Mathematics
Institute for Advanced Study
Princeton University
Tea will be served following the talk.
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Friday, April 26, 1996,  3:30 p.m.

Tufts University
Colloquium 
The Science & Technology Center
Room 136
4 Colby Street, Medford
``Theory and Experiment on Macroscopic Quantum Tunneling 
in Magnetic Systems''
PROFESSOR EUGENE CHUDNOVSKY
CUNY - Lehman College
Refreshments will be served at 3:15 p.m.
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Friday, April 26, 1996,  4:00 p.m.

Harvard University, Division of Applied Sciences
Condensed Matter Seminar 
Pierce Hall, Room 209
``Video Imaging of Fluid-Glass Transition in Binary
Colloidal Suspensions''
DR. CHERRY MURRAY
AT & T Bell Labs
Refreshments will be served following the seminar in the 
Brooks Room.
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Friday, April 26, 1996,  4:30 p.m.

Harvard University
Mathematical Physics Festival 
Jefferson Laboratory, Room 356
``Macroscopic versus Microscopic Reversibility in 
Thermodynamic Fluctuations''
PROFESSOR G. JONA-LASINIO
Universita di Roma
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 A Friendly Reminder: 

The Deadline for the April 28-May 4, 1996 Issue is: 

MONDAY, April 29, 1996 at 11:00 a.m.

End of Document