THE BOSTON AREA PHYSICS CALENDAR
Week of April 14-April 20, 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 ENTRIES RECEIVED AFTER THE DEADLINE WILL NOT 
BE PUBLISHED.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 15, 1996
Patriot's Day
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Monday, April 15, 1996, 4:30 p.m. 
 
Harvard University 
Colloquium  
Jefferson Building, Room 250 
``The Stork Brings Them: Where Partons Really Come From'' 
PROFESSOR HEIDI SCHELLMAN 
Northeastern University  
Tea will be served in Jefferson 461 at 4:00 p.m. 
 
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Tuesday, April 16, 1996
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Tuesday, April 16, 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) 
``Atoms in Intense Light Fields: Beyond Fermi's Golden Rule'' 
KLAASJAN van DRUTEN 
Massachusetts Institute of Technology  
Refreshments will be served following the Seminar. 
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Tuesday, April 16, 1996,2:30 p.m. 
 
Brandeis University 
Joint Theoretical Physics/Math Seminar  
Physics Building, Room 229 
``Conformal Compactifications of Asymptotically Flat Metrics'' 
PROFESSOR J.P. BOURGUIGNON 
Institut des Hautes Etudes Scientifiques 
Bures sur Yvette, France 
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Tuesday, April 16, 1996,2:30 p.m. 
 
Tufts University 
Joint Tufts-M.I.T.-CfA Cosmology Seminar  
Anderson Hall, Room 211 
 ``Recent Developments in String Dualities'' 
PROFESSOR CUMRUN VAFA 
Harvard University 
Refreshments will be served in the Knipp Physics Library at
2:00 p.m. 
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Tuesday, April 16, 1996,3:30 p.m. 
 
Boston University 
Colloquium  
Room SCI-107 
``Chaotic Evolution of the Solar System'' 
PROFESSOR J. WISDOM 
Massachusetts Institute of Technology 
Refreshments will be served immediately following the talk. 
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Tuesday, April 16, 1996,4:00 p.m. 
 
Brandeis University 
Martin Weiner Lecture Series 
Physics Colloquium  
Physics Building, Abelson 131 
``Extreme Models of Growth, Evolution and Depinning'' 
DR. SERGEI MASLOV 
Brookhaven National Laboratory 
Refreshments will be served in Room 333 at 3:30 p.m.  
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Tuesday, April 16, 1996,4:00 p.m. 
 
Massachusetts Institute of Technology 
Special Seminar  
Center for Theoretical Physics Seminar Room 
Building 6, Third Floor 
``Variational Calculations in SU(N) Yang-Mills 
Theory and Gauge Invariance'' 
CECILE MARTIN 
IPN Orsay 
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Tuesday, April 16, 1996,4:00 p.m. 
 
Northeastern University
Center for Interdisciplinary
Research on Complex Systems (CIRCS) 
CIRCS Seminars  
Room 114 Dana Building 
``Using Chaos Theory to Understand Transport Phenomena'' 
ROBERT DORFMAN 
University of Maryland 
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Wednesday, April 17, 1996
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Wednesday, April 17, 1996,11:45 a.m. 
 
Northeastern University 
 
***** Diamond Anniversary Lectures ***** 
 
A series of ten pedigogical lectures 
Lecture VI 
 
114 Dana (Physics Department) 
``Exactly Solvable Models in Statistical Mechanics'' 
DR. RODNEY J. BAXTER 
Australian National University 
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Wednesday, April 17, 1996,4:00 p.m. 
 
University of Massachusetts at Lowell 
Spring Colloquia 1996  
Olney Room 428 
 ``Neutron Physics at Los Alamos'' 
DR. PARRISH STAPLES 
Los Alamos National Laboratory 
Refreshments will be served at 3:30 p.m.  
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Wednesday, April 17, 1996,4:15 p.m. 
 
Boston College 
Colloquium  
Higgins Hall, Room 354 
 ``Exploring the Physics of Low Dimensional Metals'' 
PROFESSOR KEVIN E. SMITH 
Boston University 
Tea will be served at 3:30 p.m.  
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Wednesday, April 17, 1996,4:30 p.m. 
 
Boston University 
Joint Theory Seminar  
Physics Research Building 
(3 Cummington Street) Room 593 
 ``On Gauge-invariant Variables and 
Mass Gap for Yang-Mills Theory in (2+1) Dimensions'' 
PROFESSOR PARAMESWARAN NAIR 
City College of the 
City University of New York 
Refreshments will be served at 4:00 p.m.  
 
Please call (353-2600) one day in advance for parking. 
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Wednesday, April 17, 1996,5:00 p.m. 
 
Harvard University/Center for Astrophysics 
Joint Atomic Physics Seminar 
Physics in Industry Series  
Jefferson Hall - Room 356 
``Plasma Processing and Dusty Plasmas'' 
DR. SATOSHI HAMAGUCHI 
IBM Thomas J. Watson Research Center 
Tea will be served at 4:30 p.m.  
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Thursday, April 18, 1996
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Thursday, April 18, 1996,12:00 noon 
 
Harvard University 
Condensed Matter Theory Seminar  
Aiken 241 (please note room change) 
``Elasticity and Thermal Fluctuation of DNA in the test tube 
and in the cell'' 
PROFESSOR JOHN MARKO 
Center for Studies in Physics and Biology 
The Rockefeller University  
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Thursday, April 18, 1996,1:30 p.m. 
 
Harvard University Division of Applied Sciences 
Materials Science Seminar  
David Turnbull Room 402 
Gordon McKay Laboratory 
``Nanosecond Investigations of Laser Ablation Plume in Vacuum
and Background Gases'' 
DR. DAVID B. GEOHEGAN 
Oak Ridge National Laboratory 
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Thursday, April 18, 1996,4:00 p.m. 
 
Harvard-Smithsonian Center for Astrophysics  
Scientific Colloquium  
60 Garden Street (Phillips Auditorium) 
``ISO - Initial In-Orbit Results'' 
DR. MARTIN F. KESSLER 
ISO Science Operations Centre 
ESA, Villafranca, Madrid, Spain  
 
Abstract: 
 
ESA's Infrared Space Observatory (ISO) satellite was launched
successfully by Ariane flight 80 in November 1995 into the planned
highly-elliptical 24-hour orbit.  The satellite essentially consists
of a large cryostat - which contained over 2000 litres of superfluid
helium at launch - to maintain the Ritchey-Chretien telescope, the
scientific instruments and the optical baffles at temperatures between
2K and 8K.  The telescope has a 60-cm diameter primary mirror and is
diffraction-limited at a wavelength of around 5 mu-m.  A pointing
accuracy at the arc second level is provided by a three-axis-
stabilisation system.  The in-orbit lifetime - limited by the supply
of liquid helium - is expected to be 24 months.

ISO's instrument complement consists of four instruments, namely: an
imaging photopolarimeter (2.5-240 mu-m), a camera (2.5-17 mu-m) a
short wavelength spectrometer (3-45 mu-m) and a long wavelength
spectrometer (43-196 mu-m).  Between them, these instruments provide a
variety of spatial and spectral resolutions with high sensitivity
across more than 6 octaves of the infrared spectrum.  ISO's Mission
Operations Centre is located at Villafranca, Spain and ISO is used
scientifically for the nearly 17 hours a day that it spends outside
the Earth's radiation belts.  Following completion, thish February, of
a highly successful commissioning and performance verification phase,
ISO is now in its routine operation phase, making an average of about
50 observations per day. 

The colloquium will cover: an overview of the scientific mission and
satellite; details of the in-orbit performance of the spacecraft and
instruments; and some early scientific results from the performance
verification phase. 

Tea will be served at 3:30 p.m. 
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Thursday, April 18, 1996,4:00 p.m. 
 
Tufts University 
Joint Music & Physics Department Colloquium  
Alumnae Lounge 
Aidekman Arts Center 
 ``3 Million Dollars for a Strad! What's Going On?'' 
PROFESSOR W.F. FRY 
University of Wisconsin  
Refreshments will be served following the talk.  
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Thursday, April 18, 1996,4:15 p.m. 
 
Massachusetts Institute of Technology 
Colloquium  
MIT 10-250 
``Optical Lattices:  Atomic Physics Meets Solid State'' 
DR. WILLIAM PHILLIPS 
NIST  
Refreshments will be served in Room 26-110 at 3:45 p.m.  
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Thursday, April 18, 1996,4:30 p.m. 
 
Brown University 
Condensed Matter Seminar  
Barus & Holley 751 
 ``Diffusion of adatoms on stepped surfaces'' 
DR. JUHA MERIKOSKY 
Brown University  
 
Abstract: 
 
The effect of surface steps and kinks on adatom diffusion on metal
surfaces is considered.  The talk will focus on two aspects:  the
microscopic diffusion mechanisms near step edges and the effect of an
array of steps on macroscopic diffusion constants.  Results obtained
by using molecular dynamics simulations, lattice-gas Monte Carlo
techniques and analytical theory are presented, and implications on
surface growth and experimental determination of diffusion constants
are discussed. 
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Thursday, April 18, 1996,4:30 p.m. 
 
Harvard University 
Special Theoretical Physics Seminar  
Jefferson Laboratory, Room 256 
 ``The Power of Duality: Exact Results in Four Dimensional
Field Theory'' 
PROFESSOR NATHAN SEIBERG 
Rutgers University  
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Friday, April 19, 1996
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Friday, April 19, 1996,12:00 noon 
 
Massachusetts Institute of Technology 
Condensed Matter Physics: NFL Seminar  
Room 12-132 
 ``A Large-spin Phase for a Random Quantum Spin-half Chain'' 
DR. ERIK WESTERBERG 
Massachusetts Institute of Technology 
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Friday, April 19, 1996,12:30 p.m. 
 
Harvard University 
Biophysics/Condensed Matter Seminar  
SCI 352,  590 Commonwealth Avenue 
 ``Fluctuations and Supercoiling of DNA'' 
PROFESSOR JOHN F. MARKO 
Center for Studies in Physics and Biology 
The Rockefeller University 
 
Abstract: 
 
When you twist a stiff string like a shoelace and bring the
ends together, the string coils on itself to form a `supercoil'.
The same phenomenon has long been known to occur for loops of DNA.
In fact, there exist specific enzymes in organisms which serve
to change the degree of supercoiling of DNA loops.
The difference between DNA and a shoelace is that DNA does
not collapse into a thin supercoil - thermal fluctuations cause
it to be `swollen'.  Also, the transition from a random
coil to a supercoil occurs for a finite amount of twisting.
There are dramatic consequences of this picture of supercoiling
for measurements of (a) the fluctuation dynamics of DNA supercoils,
and (b) the force required to extend a piece of twisted DNA. 
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Friday, April 19, 1996,2:30 p.m. 
 
University of Massachusetts - Boston 
Chemical Engineering Seminar  
Physics Laboratory 
3rd Floor Science Building (S-3-126) 
 ``In Vitro Protein Folding:
A Fundamental and a Practical Problem'' 
ELIANA De BERNARDEZ CLARK 
Tufts University 
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Friday, April 19, 1996,4:00 p.m. 
  
Harvard University 
Division of Applied Sciences: Condensed Matter Seminar  
Pierce Hall, Room 209 
 ``Two Dimensional Melting: Large Scale Molecular
Dynamics Studies'' 
DR. TED KAPLAN 
Oak Ridge National Laboratory 
Refreshments will be served following the seminar in the Brooks
Room.  
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A Friendly Reminder:

The Deadline for the April 21 - April 27, 1996 Issue is: 
MONDAY, April 15, 1996 at 11:00 a.m.
 
End of Document.