Events at Physics
Events During the Week of April 24th through May 1st, 2016
- Plasma Physics (Physics/ECE/NE 922) Seminar
- Simulation of energetic particle driven instabilities in 3D configurations
- Time: 12:00 pm - 1:00 pm
- Place: 1153 Mechanical Engineering
- Speaker: Dr. Donald Spong, Oak Ridge National Laboratory
- Host: UW Madison
- Chaos & Complex Systems Seminar
- Green flexible electronics and the potential impact to our society and environment
- Time: 12:05 pm - 1:00 pm
- Place: 4274 Chamberlin Hall (refreshments will be served)
- Speaker: Jack Zhenqiang, UW Department of Electrical and Computer Engineering
- Abstract: Electronics industry helps sustain the GDP growth in developed countries. However, consumer electronics, such as cell phones, tablets and other portable electronic devices, are made with the consumption of large amount of precious non-renewable natural resources, such as indium and gallium etc. These consumer electronics are frequently upgraded or discarded, leading to serious environmental contamination. Thus, electronic systems consuming the minimum amount of natural resource that could also naturally degrade over a period of time are desirable which can potentially reduce the accumulation of persistent electronic waste disposed of daily. We demonstrate high performance flexible microwave and digital electronics that consume the smallest amount of natural resources on a biobased, biodegradable and microwave compatible cellulose nanofibril (CNF) paper, along with degradation of these electronic systems. With rapid technological advances leading to significant decrease in the lifetime of consumer electronics, such green chip technology with high-performance would be ideal replacement for future electronic chips where nonrenewable resources are consumed.
- Host: Clint Sprott
- Theory Seminar (High Energy/Cosmology)
- Simulating the neutrino sky: Cosmological probes of neutrino mass
- Time: 3:30 pm
- Place: 5280 Chamberlin Hall
- Speaker: JD Emberson, Argonne National Laboratory
- Abstract: Neutrinos are second only to photons as the most abundant particle in the Universe, yet remain poorly understood due to their weak interaction with other matter. In particular, individual neutrino masses remain an elusive property for both particle physicists and cosmologists. Recently, it has been proposed that individual neutrino mass may be constrained from a unique dipole distortion in the matter density field induced by the relative flow between cold dark matter (CDM) and neutrinos. We study this effect by modifying the cosmology code CUBEP3M to evolve neutrino N-body particles alongside CDM. We have performed the world's largest cosmological N-body simulation, containing roughly 3 trillion neutrino plus CDM particles, completed using 86% of the Tianhe-2 supercomputer. In this talk, we discuss preliminary analysis of the simulation data in regards to the neutrino dipole distortion. We also present a new independent probe of neutrino mass that was numerically detected in our simulation data. This new effect is due to neutrino free streaming, which sources local variations in the relative abundance of neutrinos, creating a differential bias that may skew the luminosity function of galaxies.
- Host: Amol Upadhye
- Department Meeting
- Time: 12:15 pm
- Place: 5310 Chamberlin Hall
- Cosmology Journal Club
- An Informal discussion about a broad variety of arXiv papers related to Cosmology
- Time: 12:15 pm - 1:15 pm
- Place: 5242 Chamberlin Hall
- Abstract: Please visit the following link for more details:
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 Amol Upadhye (firstname.lastname@example.org).
- Host: Amol Upadhye
- Special Physics 208 Lecture
- SHINE and Medical Radioisotopes
- Time: 8:50 am - 9:40 am
- Place: 2103 Chamberlin Hall
- Speaker: Greg Piefer, SHINE Medical Technologies
- Abstract: Greg Piefer founded SHINE Medical Technologies in 2010 and currently serves as the CEO of the company, which seeks to become the world leader in producing medical isotopes for diagnostic imaging of various conditions, including heart disease and cancer. SHINE’s revolutionary accelerator-based process allows for low-cost, environmentally friendly production of medical isotopes without a nuclear reactor. Dr. Pfiefer previously founded Phoenix Nuclear Labs, a company that has developed a new generation of high-yield neutron generators.
- Host: Mark Rzchowski
- Physics Department Colloquium
- When Magnetic Field Lines Break
- Time: 3:30 pm - 4:30 pm
- Place: 2241 Chamberlin Hall (Coffee & Cookies at 3:15pm)
- Speaker: Paul Cassak, West Virginia University
- Abstract: Freshman physics tells us that magnetic field lines are not allowed to have free ends. However, counterintuitively, magnetic field lines are allowed to break! When this process occurs in high temperature plasmas, it is called magnetic reconnection. Rather than simply being a curiosity, it turns out to be a crucial phenomenon as it facilitates the conversion of magnetic energy into kinetic energy and heat of the surrounding plasmas. It is the mechanism behind the energy release in solar flares and coronal mass ejections, geomagnetic storms producing aurora, disruptive events in magnetically confined fusion plasmas, and in many astrophysical contexts. Consequently, understanding reconnection is a key aspect of both mitigating the harmful effects of space weather and the harnessing of essentially renewable energy through fusion. Studying reconnection was the motivation for the recently-launched NASA Magnetospheric Multiscale (MMS) mission. In this talk, results using theoretical techniques and a number of different supercomputer numerical simulations will be shown. Applications to the boundary of the region of influence of Earth’s magnetic field (the magnetosphere) and fusion will be discussed.
- Host: Jan Egedal