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Activity > Lunch Talk

Lunch Talk (2017)

ASIAA Lunch Talk is an institute-wide event allowing ASIAA researchers from different fields to discuss astronomy in a very casual manner. The informal meeting is usually held at lunch time on every Monday. Occasionally visitors are also invited to the lunch talk to share their research and ideas with ASIAA researchers.

    Contact
  • Lunch Talk: Colloquium Committee (talks_replace2@_asiaa.sinica.edu.tw)
  • Tech Lunch Talk: Huang, Yen-Ru (yenruhuang_replace2@_asiaa.sinica.edu.tw)
NEXT Lunch Talk: 2017-07-10 Mon 12:00~13:00 [R1203]
Speaker:Alfonso Trejo-Cruz
Topic:ALMA ARC activity
No. Time/Place Speaker Topic (Abstract)
download PDF: dowaload talk PDF file
12017-09-18 Mon
12:00~13:00
R1203
Kai-yang Lin
[ASIAA]
Report on the intensity mapping workshop
22017-09-11 Mon
12:00~13:00
R1203
Chin-Fei Lee
[ASIAA]
32017-09-04 Mon
12:00~13:00
R1203
no lunch talk
[ASIAA]
42017-08-28 Mon
12:00~13:00
R1203
no lunch talk
[ASIAA]
52017-07-24 Mon
12:00~13:00
R1203
Shohei Aoyama
[ASIAA]
62017-07-17 Mon
12:00~13:00
R1203
Shoko Koyama
[ASIAA]
72017-07-10 Mon
12:00~13:00
R1203
Alfonso Trejo-Cruz
[ASIAA]
ALMA ARC activity
82017-06-26 Mon
12:00~13:00
R1203
Ui-Han Zhang
[NTU]
Magnetohydrodynamics with GAMER
Abstract

GAMER, a parallel Graphic-processing-unit-accerelated Adaptive-MEsh-Refinement hydrodynamic code, has been extended to support magnetohydrodynamics (MHD), where the solver for MHD features the corner-transport-upwind (CTU) scheme with the constraint transport (CT) technique. The divergent preserving operator for adaptive mesh refinement (AMR) has been applied to reinforce the divergence-free constraint on the magnetic field. GAMER-MHD has fully exploited concurrent executions of the MHD solver of GPU computation and others, including AMR, of CPU computation, and nearly 100% overlap in GPU and CPU computation is observed. Various standard tests of one-dimensional, two-dimensional and three-dimesional problems have been performed, and these tests show that GAMER-MHD is robust producing results either demosntrating the expected second-order accuracy of our numerical scheme or as good as those given by high-resolution uniform-grid runs. A new 3D MHD test problem has been explored, where the magnetic field assumes the Arnold- Beltrami-Childress (ABC) configuration that can be unstable, temporarily becomes turbulent with thin-tube reconnection and finally settles to a lowest-energy equilibrium state. This 3D problem is adopted for the performance test of GAMER-MHD in a supercomputer equipped with top-end GPU and CPU. The single-GPU performance can reach 2 × 10^7 cell-update/sec, and this code also shows high efficiency of parallelization and scalability up to O(10^3) nodes.

92017-06-19 Mon
12:00~13:00
R1203
Lapo Fanciullo
[ASIAA]
Determining the Systematic Errors in Fits of Dust Thermal Emission: The Role of Laboratory Data in Upcoming Models
102017-06-12 Mon
12:00~13:00
R1203
Yusuke Aso
[ASIAA]
ALMA observations of a very young protostar newly found in Serpens Main
112017-06-07 Wed
12:00~13:00
R1203
Lu, Wei-Chun
[ASIAA]
Introduction of Lapping and Polishing Machines for Terahertz Applications
122017-05-24 Wed
12:00~13:00
R1203
Yang, Ping-Hsueh
[ASIAA]
GBT-800 Antenna Simulation Using CST EM-tool
132017-05-15 Mon
12:00~13:00
R1203
Kuan-Chou Hou
[ASIAA]
Dust enrichment in galaxy and cosmology simulations
142017-05-10 Wed
12:00~13:00
R1203
Yen, Sheng-Feng
[ASIAA]
wSMA series: My Baker Life - The LDPE Anti-reflection Coating
Abstract

In this talk, I will mention why we need and quartz windows. And why using LDPE to reduce the reflection. How we coated the LDPE ( Low-density polyethylene ) at the quartz surface. And preliminary result.

152017-05-08 Mon
12:00~13:00
R1203
Satoki Matsushita
[ASIAA]
Working in Greenland in the Middle of Winter
162017-04-26 Wed
12:00~13:00
R1203
Chang, Yin-Chang
[ASIAA]
The TAOS 2 Camera Dewar Assembly
172017-04-24 Mon
12:00~13:00
R1203
Kota Naito
[ASIAA/NTU]
Statistical Study on Organic Inclusions in Meteorites
182017-04-17 Mon
12:00~13:00
R1203
Min-Kai Lin
[ASIAA]
Dusty disk-planet simulations
Abstract

I will present ongoing simulations to study the interaction between protoplanetary disks and embedded protoplanets using a modified version of the PLUTO code. I will show how dusty disk-planet torques can differ from that in pure gas disks, which is considered in most previous studies.

192017-04-12 Wed
12:00~13:00
R1203
Chiang, Po-Han
[ASIAA]
202017-03-29 Wed
12:00~13:00
R1203
Chiu, Chuang Ping
[ASIAA]
1.5THz Cartridge System
212017-03-27 Mon
12:00~13:00
R1203
Peter Scicluna
[ASIAA]
Observing mass-loss from evolved massive stars
222017-03-15 Wed
12:00~13:00
R1203
Chueh-Yi Chou
[ASIAA]
PFS fiber probe calibration unit
232017-03-01 Wed
12:00~13:00
R1203
Yen-Bin Chang
[ASIAA]
Fabrication of orthomode transducer for wSMA
242017-02-20 Mon
12:00~13:00
R1203
Kouichi Hirotani
[ASIAA]
Emission from the direct vicinity of black holes
Abstract

In a black hole magnetosphere, when the plasma accretion rate is much lower than the Eddington limit, a strong electric field inevitably appears along the magnetic field lines due to charge deficit. In such a charge-starved region (or a gap), the electric field accelerates migratory electrons and positrons into ultra relativistic energies. These relativistic leptons emit copious gamma-rays via curvature and inverse-Compton (IC) processes. Some of such gamma-rays collide with the submillimeter-IR photons emitted from the radiatively inefficient accretion flow (RIAF) to materialize as pairs. The created pairs polarize to partially screen the original acceleration electric field. By solving this pair-creation cascade self-consistently for the first time, we find that the gap emissions from the direct vicinity of stellar-mass, intermediate-mass, and super-massive black holes are detectable with Fermi/LAT and Imaging Atmospheric Cherenkov Telescopes (e.g., MAGIC, HESS, VERITAS, and CTA) when the accretion rate is in a certain range. Moreover, such HE/VHE gamma-ray fluxes are predicted to exhibit anti-correlation with the RIAF submillimeter fluxes, which enables us to discriminate the gap emission from the standard, shock-in-jet model, e.g., by using ALMA and CTA.

252017-02-15 Wed
12:00~13:00
R1203
Li Chao-Te
[ASIAA]
Millimeter Wave Grating Spectrometer for TIME
262017-02-13 Mon
12:00~13:00
R1203
Youichi Ohyama
[ASIAA]
Proposing to Subaru
272017-02-06 Mon
12:00~13:00
R1203
Ai-Lei Sun
[ASIAA]
Characterizing AGN [OIII] Extended Emission Line Regions with SDSS Images.
282017-01-18 Wed
12:00~13:00
R1203
Chen, Chung-Cheng
[ASIAA]
When Something is Broken...
292017-01-09 Mon
12:00~13:00
R1203
Shiang-Yu Wang
[ASIAA]
the Chinese large optical telescope projects
302017-01-04 Wed
12:00~13:00
R1203
Ling Hung-Hsu
[ASIAA]
Detector quality assurance for astronomy instrumentation
TEL: 886-2-3365-2200 FAX: 886-2-2367-7849
General: asiaa_replace2@_asiaa.sinica.edu.tw Media Request: epo_replace2@_asiaa.sinica.edu.tw
11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.