Events at Physics
Events on Tuesday, April 26th, 2016
- Chaos & Complex Systems Seminar
- Green flexible electronics and the potential impact to our society and environment
- Time: 12:05 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