From: calendar@ALMADEN.IBM.COM (IBM Almaden Research Center Calendar)
Newsgroups: ba.seminars
Subject: IBM ARC seminars 14 - 18 SEP 92
Date: 11 Sep 92 22:26:54 GMT


                     IBM Almaden Research Center
                           650 Harry Road
                       San Jose, CA 95120-6099

                              CALENDAR
                        September 14-18, 1992


09/14 - LITHOGRAPHY USING SELF-ASSEMBLED MONOLAYERS AND CHEMICAL ETCHING
Dr. A. Kumar, Harvard University, Department of Chemistry

Phys. Sci. Sem.     Monday, September 14    9:00 a.m.   Room: D3-450

Convenient, non-photolithographic techniques are described for the
fabrication of gold, copper, and silver, supported as thin films on
silicon wafers (with a native oxide coat) and on glass.  These
techniques are based on the ability of self-assembled monolayers (SAMs)
on gold, copper, or silver to protect the metal from an etching solution
comprising of an O2-saturated solution of 1 M KOH, 0.001 M KCN.
Patterns of HS(CH2)15-17.  CH3 were formed by several techniques:
microwriting, rubber stamping, masking, micromachining, and electron
beam lithography.  The fabricated microstructures are spatially
continuous, electronically conductive, and, in the best cases exhibit
only a small number of defects (fewer than 5 pits of approximately 1
mu m diameter/mm2).  Features having lateral dimensions as small as 0.1
mu m and as large as several mm have been produced.  Several different
etch formulations have also been developed that exhibit selective
etching.  These techniques provide a repertoire of methods for the rapid
microfabrication and macrofabrication of metallic structures.
Host:  J. Gordon


09/14 - VIBRATIONAL ENERGY TRANSFER OF HIGHLY VIBRATIONALLY EXCITED NO
USING THE STIMULATED EMISSON PUMPING TECHNIQUE
Prof. A. Wodtke, Department of Chemistry, UCSB

Phys. Sci. Sem.    Monday, September 14    10:00 a.m.    Room: J2-609

The stimulated emission pumping (SEP) technique has made the study of
highly vibrationally excited molecules increasingly appealing, enabling
sophisticated spectroscopic probes to be converted to preparation
techniques.  With such an approach even relatively improbable processes,
such as vibrational energy transfer and chemical reactivity, may be
studied.  This talk will describe studies of the vibrational quantum
number dependence of the vibrational relaxation of highly vibrationally
excited Nitric Oxide, which is one of the first data sets on bimolecular
energy transfer for molecules with several hundreds of kJ/mol of
internal energy.  Information is obtained showing to what extent energy
transfer theories designed for low vibrational energy can be applied in
this case.  Strong evidence is also obtained suggesting that
qualitatively different mechanisms such as "transient chemical bond
formation" can influence the rate of vibrational energy transfer at high
vibrational energy.
Host:  D. Auerbach


09/14 - A THEORY OF WORMHOLE ROUTING IN PARALLEL COMPUTERS
E. Upfal, Mathematics and Related Computer Science

Comp. Sci. Sem.    Monday, September 14    3:00 p.m.    Room: Aud A

Virtually all theoretical work on message routing in parallel computers
has dwelt on packet routing:  messages that are conveyed as packets.  An
entire packet can reside at a node of the network and a packet is sent
from the queue of one node to the queue of another node until it reaches
its destination.  The current trend in multicomputer architecture,
however, is to use wormhole routing.  In wormhole routing a message is
transmitted as a continuous stream of bits, physically occupying a
sequence of nodes/edges in the network.  Thus, a message resembles a
worm burrowing through the network.

In this paper we give theoretical analyses of simple wormhole routing
algorithms, showing them to be nearly optimal for butterfly and mesh
connected networks.  (Joint work with Prabhakar Raghavan, IBM Watson
Research Center.)
Host:  R. Fagin


09/17 - LARGE PHASE TRANSITIONS AT LIQUID SOLID INTERFACES:  A SIMPLE
MODEL
Prof. L. Blum, Physics Department University of Puerto Rico

Phys. Sci. Sem.    Thursday, September 17    9:30 a.m.    Room: J2-601

A statistical mechanical theory for the electrodeposition of metals on
crystalline electrodes is discussed. In this theory the vertical and
longitudinal structures are coupled through mean field parameters.  A
model for the electrodeposition  of Cu on Au(111) in the presence of
sulphuric acid is proposed.
Host:  K. Kanazawa


09/17 - A SIMPLE CONTINUOUS-TIME EQUALIZER FOR USE IN MAGNETIC STORAGE
READ CHANNELS
P. Pai, School of Engineering, UCLA

Stor. Syst. & Tech. Sem.  Thursday, September 17  2:00 p.m.  Room: C2-440

A four-pole continuous-time equalizer has been developed to minimize the
error rate in rigid-disk magnetic storage channels employing
peak-detection at high recording densities. The equalizer outperforms
more complex structures proposed for this task, and is well suited for
implementation as an analog CMOS active filter with low power
dissipation.  The filter has been designed using measured waveforms of
signal and noise in different types of disk-drives, and its
constellation of four poles and a zero appears to be useful for several
types of magnetic media.  Signal processing and physical implementation
issues will both be discussed in this presentation.
Host:  M. Hassner

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For further information on individual talks, please contact the host
listed above.

Visitors, please arrive 15 minutes early.  IBM's Almaden Research
Center (ARC) is located adjacent to Santa Teresa County Park, between
Almaden Expressway and U.S. 101, about 10 miles south of Interstate
280.  From U.S. 101, exit at Bernal Road, and follow Bernal Road west
past Santa Teresa Blvd. into the hills (ignoring the left turn for
Santa Teresa Park).  Alternatively, follow Almaden Expressway to its
southern terminus, turn left onto Harry Road, then go right at the ARC
entrance (about a quarter of a mile later) and go up the hill.  For
more detailed directions, please phone the ARC receptionist at (408)
927-1080.

IBM Almaden Research Center electronically distributes both its
complete calendar of seminars and a subset of Computer Science
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