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This Week at Physics

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Events During the Week of September 15th through September 22nd, 2013

Monday, September 16th, 2013

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:30 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
    http://cmb.physics.wisc.edu/journal/index.html
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Le Zhang (lzhang263@wisc.edu)
Host: Peter Timbie
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Tuesday, September 17th, 2013

Chaos & Complex Systems Seminar
Scaling wireless network capacity with node density
Time: 12:05 pm
Place: 4274 Chamberlin
Speaker: Xinyu Zhang, Xinyu Zhang, UW Department of Electrical and Computer Engineering
Abstract: Wireless spectrum is limited, so packing more devices into limited spectrum is the key to improving network capacity. Yet the current infrastructure wireless networks are interference-limited. Their capacity does not scale with the density of infrastructure nodes (i.e., the access points, or APs). This lack of scalability clearly mismatches the wireless traffic demand that is growing with user density. In this talk, I will introduce a novel network architecture, NEMOx, that can scale wireless network capacity with AP density. NEMOx organizes a network into practical-size clusters, each containing multiple distributed APs (dAPs) that opportunistically synchronize and cooperate with each other. Inter-cluster interference is managed with a decentralized channel-access algorithm, which is designed to balance between the dAPs' cooperation gain and spatial reuse. Within each cluster, NEMOx optimizes the power budgeting among dAPs and the set of users to serve, ensuring fairness and effective cancellation of cross-talk interference. We have implemented and evaluated a prototype of NEMOx in a software radio testbed, demonstrating its throughput scalability and multiple folds of performance gain over current wireless LAN architecture.
Host: Clint Sprott
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Wednesday, September 18th, 2013

Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, September 19th, 2013

Astronomy Colloquium
"The Atomic to Molecular Gas Transition in Galaxies"
Time: 3:30 pm
Place: 4421 Sterling Hall
Speaker: Tony Wong, Univesity of IL- Urbana -Champaign
Abstract: Molecular gas is the direct fuel for star formation, yet in most galaxies the neutral ISM is predominantly atomic. The HI-H_2 balance is governed directly by photodissociation balance, which in turn is sensitive to the environmental conditions which determine gas density, pressure, and metal abundance. I review several recent models for how the HI-H_2 balance is set and present recent CARMA results that can be used to test them. I will finish by outlining a few projects underway for the LMC, which I will argue is the best laboratory to develop and test various approaches to measuring the gas content of galaxies and hopefully reduce the many systematic uncertainties that we still suffer from.<br>
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Prospective Undergraduate Majors in Physics
PUMP Meeting
Time: 4:30 pm
Place: 2241 Chamberlin Hall
Abstract: Are you interested in majoring in Physics? How about Astronomy? Wondering what can you do with a Physics Degree? Come to the Prospective Undergraduate Majors in Physics (PUMP) Meeting to learn more.<br>
<br>
Food and soda will be provided.<br>
<br>
Topics Include: Why Major in Physics and/or Astronomy; What Can You do with a Physics Degree; Major Requirements in both majors; Undergraduate Research Opportunities; and Tutoring and Mentoring Opportunities.
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Garage Physics
Kickoff Meeting
Time: 5:30 pm
Place: B651 Sterling Hall
Abstract: Do you have a project that doesn't seem to fit in? Do you want to collaborate with other STEM majors, but you don't know where to come together? Do you want to learn about &amp;quot;making&amp;quot; or 3D printing? Prof. Carlsmith has some room for you.&lt;br&gt;<br>
&lt;br&gt;<br>
The Garage Physics Kickoff meeting is an opportunity to hear more about this project development space for Physics students, faculty and staff. Prof. Carlsmith has resources to help Physics community members explore new ideas, experiments and possibilities in the field.&lt;br&gt;<br>
Host: Prof. Duncan Carlsmith
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Friday, September 20th, 2013

Theory Seminar (High Energy/Cosmology)
Yunified GUTS: MSSM at Large tanb
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Archana Anandakrishnan, Ohio State University
Abstract: I will talk about the consequences of gauge and third family Yukawa coupling unification for the LHC. In a recent work, we analyzed a Yukawa unified supersymmetric grand unified theory (GUT) with non-universal Higgs masses defined at the GUT scale. We performed a global fit using 11 observables, including the Higgs boson mass (arXiv:1212.0542). Gluinos should be visible at the LHC in the 14 TeV run but they cannot be described by the typical simplified models (arXiv1307.7723). I will also describe a complete three family model and discuss the quality of the global chi^2 fit to 35 observables. In addition, I will discuss work with a new set of boundary conditions that is consistent with Yukawa unification at the GUT scale (arXiv:1303.5125).
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Physics Department Colloquium
A Scientist’s View of Research for Sustainable Energy
Time: 3:30 pm
Place: Notice--different location: Room AB20, Dept. of Geoscience, Weeks Hall, 1215 W. Dayton Street
Speaker: Ellen Williams, BP, Chief Scientist
Abstract: We face one of the biggest challenges of the 21st century: providing more and more energy to meet rising demand, but keeping it affordable, secure, reliable and sustainable. But aEuro~sustainableaEuroTM means different things to different people aEuro&quot; from discovering and recovering more oil and gas to minimizing the impacts on natural resources used in energy. In this talk, Ellen Williams will outline the importance of scientific research to both finding new solutions and providing trusted data to underpin informed decisions about energy, water, land and minerals. Three examples of research addressing these topics will be presented from a perspective of the scientific challenges in delivering new value in the energy system. These will span the disciplinary space of geoscience, chemistry, biology and natural resource systems.<br>
<br>
Ellen Williams joined BP as Chief Scientist in January 2010. She is responsible for supporting the basic science that underpins the companyaEuroTMs technology programs, assessment and research in strategic technology issues and engagement with BPaEuroTMs university research programs around the world.<br>
Host: Himpsel
Poster: http://www.physics.wisc.edu/twap/posters/2013/2970.pdf
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"This Week at Physics" poster: http://www.physics.wisc.edu/twap/posters/2013/2013-09-16.pdf

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