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Physics & Astronomy Grad Student Colloquium
Start Date: 11/9/2018Start Time: 4:00 PM
End Date: 11/9/2018End Time: 5:00 PM
Event Description:

Please join us this Friday for our Grad Student Colloquia:

Speaker 1: Cole Treyturik

Title: "Using X-Ray Spectroscopy to Determine the Progenitor of the supernova remnant 3C 397"

Abstract: " Supernovae number amongst the most energetic events in the known universe, and their remnants are of great importance to both the structure of galaxies and the propagation of most heavy elements in the universe. The supernova remnant (SNR) known as 3C 397 is a peculiar object, and the origin of its progenitor as either a Type IA or a core-collapse supernova has been the subject of some debate. Using data obtained by XMM-Newton – the European Space Agency’s space-based X-ray observatory – we perform an X-ray study of this supernova remnant, including both a spectroscopic analysis and a comparison to the latest models of stellar nucleosynthesis yields. By performing this analysis, we determine the relative abundances of a number of elements within the remnant, as well as their distribution throughout it. Finally, by comparing these abundances to models of stellar nucleosynthesis yields, we attempt to answer the question about this SNR’s origins, and determine whether it came about due to a Type Ia or a core-collapse supernova event. "

Speaker 2: Kyle Shiells

Title: "An Improved Calculation of the Vud CKM Matrix Element"

Abstract: The CKM matrix of the Standard Model (SM) is a unitary 3x3 matrix which holds information on how strongly the various quark flavours couple to each other. Consequently, nature’s adherence to the SM can be tested by the normalization condition of its rows. Vud = 0.97420(21) is a dominant term in the first row unitarity condition: |Vud|2 + |Vus|2 + |Vub|2 = 1, and as such, carries more weight than its 2 neighbours. The largest source of its uncertainty comes from a troublesome, model-dependent radiative correction: the γW box. I outline a new way to calculate this diagram using dispersion relations, which will decrease the final uncertainty of Vud.

Speaker 3: Darren Flynn

Title: "Mathematical Fields in Physics"

Abstract: Fields (in the mathematical sense) are the basic tools physicists use to describe the universe. But, conventional physics employs only the so-called Archimedean fields; that is the Real and Complex numbers. In this talk we will discuss what makes the Archimedean fields unique, what alternatives exist, and how these alternatives have been used in physics.

Speaker 4: Yaroslav Wroczynskyj


Title: Charging surfaces: using electroacoustic to quantify nanoparticle surface potentials


Abstract: The efficacy and final outcome of a nanoparticle system for biomedical application is ultimately determined by the nano-biological interface at the particle surface, typically probed only in ideal conditions (low concentrations and optically transparent media) that are not reflected in application. Recent research has shown that it is necessary to consider the effects that biological media (high electrolyte and protein concentrations) have on the dynamic charge equilibriation. The equilibriated charge distribution around a nanoparticle, or protein corona, is hysteretic; the corona depends on what environment the nanoparticle is exposed to. I have developed a model independent electroacoustic method that probes the protein corona through measurement of the pressure oscillations produced by nanoparticle suspensions in an AC electric field. Electroacoustic magnitudes are related directly to the equlibriated nanoparticle surface charge, known as the zeta-potential, while phase information provides insight into the dynamic processes, e.g. charge distribution polarization, that influence protein corona formation. Results will be presented for silica nanoparticles with varying suspension properties that fall into a regime not accessible by typical characterization techniques. 

Friday, November 9, 2018

4:00 pm, 330 Allen Building

Coffee will be served prior to the talk, at 3:30 pm, in 316 Allen Building (Coffee Room). There will discussion and snacks

after the talk also in the Coffee Room, hosted by the P&A Graduate Students

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