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Foro sobre Fisica Estadistica <[log in para visualizar]>
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Foro sobre Fisica Estadistica <[log in para visualizar]>
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From [log in para visualizar] Tue Jan  4 14:22:40 2000
Date: Tue, 04 Jan 2000 14:22:29 +0100
From: Peter Dimon <[log in para visualizar]>
Subject: postdoc opening
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Date: Mon, 03 Jan 2000 23:05:23 -0400
From: Jerry Gollub <[log in para visualizar]>
Subject: POSTDOCTORAL opportunity (expt.)-granular/fluid dynamics
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Dear Colleague,

        I anticipate filling a position for experimental research on
granular materials and/or fluid mixing  (pending a grant renewal) for the
summer of 2000.   The position requires an _experimental_ Ph.D. and
demonstrated interest in nonlinear physics or fluids.  Mentored teaching
opportunities are also available for a candidate who might like to
strengthen quanlfications in that area. Would one of your experimental
students possibly be interested in this position?

        A talented person wishing to explore the possibility of a faculty
job in an institution where BOTH research and teaching are valued would
have something unique to gain from working in this environment and
collaborating with undergraduates.  One of our talented undergraduate
students won the national APS Apker Award for his research on fluid mixing.

        Our program is also affiliated with The University of Pennsylvania,
where we often attend seminars and colloquia.  Penn is especially strong in
the area of soft condensed matter physics.  We are located in the
attractive western suburbs of Philadelphia, close to many universities,
cultural activities, and employment possibilities for spouses.

        If you know of a suitable  candidate, I would appreciate your
asking her or him to send me a letter describing background and interests,
and a CV.  A letter from you would also be needed.   E-mail is fine for
correspondence.  Haverford College is an equal opportunity / affirmative
action employer.

                        Jerry Gollub

Extensive studies are being made of the dynamics of granular materials, by
means of sensitive force measurements and rapid tracking of large numbers
of particles. We are addressing questions of fundamental and practical
importance that have been raised by recent theories, in which adaptive
inhomogeneous force networks are thought to be important in governing the
behavior of granular materials. This work includes the following:

A. We are investigating the dynamical behavior of granular matter that has
been simultaneously sheared by rotation and fluidized by a controlled
upward air flow. We are investigating the flow of these materials, and hope
to understand precisely how momentum, material, and energy are transported.

B. We are extending previous studies of frictional dynamics in planar
layers, by determining the influence of the size distribution and particle
properties on the static strength and motion, by approaching the colloidal
limit of small particle size, and by exploring the fracture-like phenomena
we have observed in these materials.

C. We are studying avalanching and flows in inclined layers, making careful
measurements of stability and creep, susceptibility to perturbations,
velocity profiles and fluctuations. Obstructed flows are investigated as an
illustrative case of practical interest.

We expect to compare this granular flow behavior with analogous
conventional solid and fluid phenomena, to elucidate the special properties
of particulates and to determine the usefulness of various theoretical
paradigms. Some of these experiments have geophysical motivations.

We are also studying fluid mixing phenomena in thin layers and films. We
recently discovered "persistent mixing patterns" in chaotic advection
(Nature, October 21, 1999), and documented dramatic differences between
chaotic and turbulent mixing. In this work, we use precise fluorescent
imaging methods to study the efficiency of mixing and transport.
Experimental studies of chaotic mixing using reactive components, and an
exploratory study of mixing in small-scale devices, are under

 For further information:

                        Jerry Gollub

Jerry P. Gollub (John and Barbara Bush Professor in the Natural Sciences)
Physics Department, Haverford College
370 Lancaster Avenue
Haverford, PA 19041 USA
Also Adjunct Professor of Physics at The University of Pennsylvania

PHONE: 610-896-1196;    Fax: 610-896-4904
E-mail: [log in para visualizar]