171001 Study and Application of Time-Delayed Feedback for Solid-State Photon Sources

Title:
Study and Application of Time-Delayed Feedback for Solid-State Photon Sources

Speaker: 
張鑑元 (Ted Chang)

Time: 
10/01 (Sun.) 9 pm PDT, 10 am MDT, 11 am CDT, 12 pm EDT, 10/02 (Mon.) 12 am Taiwan

Link: 
Join the talk on BlueJeans: https://bluejeans.com/6366170552/

Abstract: 
Time-delayed feedback introduces various dynamical behaviors when coupled with a solid-state photonic structure. The study of these dynamical properties is an essential step towards the development of novel applications involving measurement and manipulation of various types of solid-state systems. Specially, we examine the significant effect of time-delayed feedback with two different types of solid-state structures: the semiconductor lasers diode and single photon emitter. The first part of this proposal focuses on the e_ect of time-delayed feedback with an external cavity semiconductor laser (ECSL) since such a system provides an excellent test bed for the study of nonlinear delay-coupled systems. In the second part, we explore the time-delayed feedback of a single photon emitter. We focus on the theoretical study of the dynamics of a single quantum dot embedded in a micropillar cavity.

170916 Molecular Biology study of Hepatitis C Virus and Autophagy

Title:
Molecular Biology study of Hepatitis C Virus and Autophagy

Speaker:
Dr. 王琳雅 (Linya Wang, University of Southern California)


Time:
09/16 (Sat.) 3 pm PDT, 4 pm MDT, 5 pm CDT, 6 pm EDT
09/17 (Sun.) 6 am Taiwan


Link:
Join the talk on BlueJeans: https://bluejeans.com/6366170552/


Abstract:
Autophagy is a catabolic process by which cells remove protein aggregates and damaged organelles for recycling. It can also be used by cells to remove intracellular microbial pathogens including viruses in a process known as xenophagy. However, many viruses have developed mechanisms to subvert this intracellular antiviral response and even use this pathway to support their own replications. Hepatitis C virus (HCV) is one such virus. HCV is an important human pathogen that can cause severe liver diseases. Recent studies indicated that HCV could activate the autophagic pathway to support its replication. This talk summarizes the current knowledge on the interplay between HCV and autophagy and how this interplay affects HCV replication and host innate immune responses.

170909 Characterizing Faint Submillimeter Galaxies with Cluster Lensing

Title:
Characterizing Faint Submillimeter Galaxies with Cluster Lensing

Speaker:
徐立研 (Li-Yen Hsu)

Time: 
09/09 (Sat.) 3 pm PDT, 4 pm MDT, 5 pm CDT, 6 pm EDT 
09/10 (Sun.) 6 am Taiwan

Link:  

part 1
 

part 2
 
Join the talk on BlueJeans: https://bluejeans.com/6366170552/

Abstract:

Based on the measurements of the integrated background light from extragalactic sources, it is known that about half of the starlight is absorbed by dust and re-radiated into the far-infrared (FIR).  It is therefore important to study both the unobscured and dust-obscured populations of galaxies across cosmic time for a full picture of the star formation in our universe. At z > 1, the FIR emission from galaxies is redshifted to the submillimeter. However, surveys made with single-dish submillimeter telescopes are confusion limited at low fluxes (< 2 mJy at 850 micron) and can only detect ultra-luminous galaxies. Consequently, we have little information about fainter submillimeter galaxies (SMGs), which are actually the major contributors to the submillimeter background light and therefore the dominant star-formers in the dusty universe. Determining how much these faint SMGs overlap the optically selected samples is critical to fully account for the cosmic star formation history. Observations of massive cluster fields are the best way to study faint galaxies, thanks to gravitational lensing. To explore the faint submillimeter population, we have been observing nine galaxy clusters with the SCUBA-2 camera on the James Clerk Maxwell Telescope. We also used interferometric observations with the Karl G. Jansky Very Large Array and the Submillimeter Array to determine the accurate positions of our detected sources. Our observations have discovered a population of faint SMGs that are undetected in deep radio, optical, and near-infrared images. This suggests that a significant fraction of the population with infrared luminosities < 10^12 L_sun may be hidden from optical surveys and would not be included in the UV star formation history.