Physics and Astronomy Colloquium Schedule

(If you want on the Colloquium announcements email list, please send Joe Carson a note)

FALL 2019 Colloquium Schedule

(Usually Thursdays at 1:45 in RITA 387)

September 12th   
Will Ceva (CofC)
Title: Investigating the Impact of Episodic Stellar Activity on Planet Formation and Evolution

Austin Purtell (CofC)
Title: Direct Imaging of Exoplanets Using Hubble Archival Data

September 19th
Bridget Ierace (CofC)
Title: Magneto-Rotational Instability in Magnetically Polarized Disks

Ashley Dowd (CofC)
Title: Long-term Evolution of Classical Novae

September 26th   
Erika Hamilton (CofC)
Title: Quasi-Periodic Oscillations from a precessing Hot, Thick Torus-like flow

Blake Mino (CofC)
Title: Utilizing Image Processing Techniques In Search Of Directly Imaged Exoplanets

October 3rd
Aidan Blankenship (CofC)
Title: Interactions of Type I X-ray Bursts with Thin Accretion Disks

Lucy Williamson (CofC)
Title: Investigating the Impace of Episodic Stellar Activity on Planet Formation and Evolution

October 10th
Deepika Bollimpalli
Nicolaus Copernicus Astronomical Center
Title: Variability in accretion flows: Comparison of numerical simulations with observations

Abstract: Long term observations of black-hole X-ray binaries show that these systems exhibit extreme, aperiodic variability on time scales of few milliseconds to seconds. The observed light-curve displays various characteristic features like log-normal distribution and linear rms-flux relation, which indicates that the underlying variability process is stochastic in nature and is thought to be intrinsic to the accretion process. A general idea is that the variability is driven by the inward propagating fluctuations of mass accretion rate on viscous timescales, although much remains puzzling about the physical process driving the fluctuations. Numerical simulations of magnetized accretion flows in general relativity could perhaps provide a better understanding of the underlying variability process. Using a set of different GRMHD simulations as test-beds, we look for hints of propagating fluctuations of accretion rate in the simulation data. I will discuss the findings from our timing analysis of data obtained from numerical simulations, focusing on how our results compare with the model and observations.

Dr. Yingxin Deng
KPPB law firm
Title: Bioelectronics: protonic transistors and disposable breathalyzers

Abstract: Modern electronics and materials science are bringing revolutionary advances to biointerface design, and are pushing the limits in the areas of biomedical sensing and diagnostics. I will share my research journey in bioelectronics seeking to explore the interfaces between electronics, materials science and biochemistry. I will first talk about the dynamics of palladium hydride (PdHx) as H+ injecting contacts and its use in protonic conducting devices. With PdHx as contacts, a polysaccharide integrated field effect transistor measures and modulates the flow of H+. Secondly, I will delve into small molecule sensing with transistors. Coupled with enzymatic reactions, an organic electrochemical transistor (OECT) detects Blood Alcohol Concentration (BAC) at a clinically relevant value in vitro and with human volunteers. The OECT is inkjet printed on paper and modified with alcohol dehydrogenase (ADH) as a proof-of-concept disposable breathalyzer.

November 7th
Dr. Maciek Wielgus
Black Hole Initiative, Harvard/Smithsonian
Title: TBA

November 21st
Christian Boutan
Radiation Detection and Nuclear Sciences Group, NATIONAL SECURITY DIRECTORATE, Pacific Northwest National Laboratory
Title: TBA