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About October 2010

This page contains all entries posted to Physics Announcements in October 2010. They are listed from oldest to newest.

September 2010 is the previous archive.

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October 2010 Archives

October 6, 2010

Seminar: Wednesday, October 6, 2010 at 3:30 p.m. Coffee 3:15 p.m.

New results on high energy cosmic ray electrons observed with Fermi LAT and their implications on the origin of cosmic rays
Dr. Alexis Moiseev
CRESST/UMCP
The Large Area Telescope on-board the Fermi Gamma-Ray Space Telescope has collected more than 10 million cosmic ray electrons with energy above 7 GeV since its science operation on orbit. High energy electrons rapidly lose their energy by synchrotron radiation on Galactic magnetic fields and by inverse Compton scattering on the interstellar radiation field. The typical distance over which a 1 TeV electron loses half its total energy is estimated to be 300-400 pc.This makes them a unique tool for probing nearby Galactic space. Observed spectrum has a harder spectral index than was previously reported and suggests the presence of nearby sources of high energy electrons. One of viable candidates are nearby pulsars, possibly some of recently discovered by Fermi. At the same time the dark matter origin of such sources cannot be ruled out. I will also report our current upper limits on cosmic ray electrons anisotropy which helps to set constraints on their local sources.

October 13, 2010

Seminar: Wednesday, October 13, 2010 at 3:30 p.m. Coffee 3:15 p.m.

Compact Silica Microcavities for Sensing, Communications, and Information Processing
Dr. Lee Oesterling
Battelle
Dr. Lee Oesterling is the leader of a research team at Battelle that has been working on the development of high Q, small mode volume optical microcavities that can be produced in large arrays on silicon chips to support a wide variety of defense and commercial applications. Applications for this technology include filters, multiplexers, low threshold lasers, all optically controlled switches, buffers, chem/bio sensors, and optical microphones. In this seminar, Dr. Oesterling will discuss (1) the fabrication techniques to create high Q microcavities, (2) the integration of these microcavities into optical circuits to create sensors, lasers, and photon routers, and (3) research and developmental work that is currently being performed in this field at Battelle and leading universities.

Brief Bio: Dr. Lee Oesterling has 10 years of experience with the development of optical and photonic technologies, which includes work at JDS Uniphase and Battelle. He received his Ph.D. in Chemical Physics from The Ohio State University in 2009.

October 20, 2010

Seminar: Wednesday, October 20, 2010 at 3:30 p.m. Coffee 3:15 p.m.

Parallel Computing for Long-Time Simulations of Calcium Waves in a Heart Cell
Dr. Matthias Gobbert
UMBC/Math
Parallel computing can fascilitate both solving larger problems and solving them faster than possible on a serial computer. This has the potential for new discoveries in many subject areas and highlights the opportunities arising from using state-of-the-art computational hardware and software. The numerical simulation for a model of calcium waves in a heart cell serves as example for the power of parallel computing to enable the faster solution of larger problems. Using this prototypical example, I will explain the ideas and considerations in the creation of the UMBC High Performance Computing Facility (www.umbc.edu/hpcf), the community-based, interdisciplinary core facility for scientific computing and research on parallel algorithms at UMBC. There will be plenty of time throughout the talk to discuss with the audience the hardware, software, structure, and user support in HPCF, and how researchers at UMBC can participate.

October 27, 2010

Seminar: Wednesday, October 27, 2010 at 3:30 p.m. Coffee 3:15 p.m.

"Hunting for Gamma-ray Binaries"
Dr. Robin Corbet
UMBC/CRESST
The X-ray sky (beyond the Sun) is dominated by emission from luminous binary star systems containing neutron stars and black holes. However, at higher gamma-ray energies (GeV to TeV) very few of these binaries are so far known to be sources.

The Fermi satellite, launched two years ago, carries the LAT, a much more sensitive detector than any previous gamma-ray astronomy spacecraft. I will present the results of LAT observations of the exotic binary systems that do produce gamma-ray emission, and discuss what we can learn from these sources. I will also describe our hunt for new members of this class, including the techniques we are developing to maximize our signal-to-noise in this search.

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