[Physics-grads-open] (Topic changed!) Physics & Astronomy Student Seminar (PASS), June 6th at 4 pm, Phys 3027

[Ming-Feng Ho]

Happening in 5 mins.

Ming-Feng

On Mon, Jun 6, 2022 at 11:19 AM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> Hi all,
>
> *The original speaker couldn't make it for today.* Alternatively, I will
> give a short talk on my research to finish this quarter's PASS seminar
> series.
>
> After the talk, we will have a short organizing meeting to discuss how to
> improve future PASS. We will also discuss how to carry out the summer PASS
> session.
>
> *Title: Bayesian models for finding DLAs and measuring quasar redshifts
> using Gaussian processes*
>
> Ming-Feng Ho (University of California, Riverside)
>
> *Abstract:* Part I: We present a machine learning model for automating
> the detection of damped Lyman alpha absorbers (DLAs) in quasar spectra. Our
> model is based on Gaussian processes with a tailored covariance function
> learned from data. We train our model on SDSS DR9 and validate it on SDSS
> DR12 with ~96% accuracy. The same model is re-trained on SDSS DR12 and
> provides a DLA catalog for SDSS DR16 with posterior samples for each
> spectrum.
>
> Part II: We demonstrate a probabilistic framework for finding DLAs with
> unknown quasar redshifts. Our redshift model is an extension of our
> previous DLA model with known quasar redshifts. We show that the extended
> model can simultaneously marginalize DLA detection and quasar estimation
> with a small decrease in accuracy. The extended model can also be used as a
> quasar redshift estimator.
>
> Monday, June 6, 2022 at 4 pm
> Physics 3027 (Nebula Room)
>
> To submit abstracts for Summer Quarter: [Abstract Submission
> <https://jibancat.github.io/ucr-student-seminars/registration/index.html>
> ].
>
> Best,
> Ming-Feng
>
>
> On Fri, Jun 3, 2022 at 4:30 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
> wrote:
>
>> Hi all,
>>
>> We are going to have our final PASS seminar talk this quarter. We are
>> very happy to have our first condensed matter theory talk in PASS, given by
>> Pak Kau Lim (from Michael Mulligan's group). He will be reviewing the
>> renormalization group approach in condensed matter theory.
>>
>> *Title: Review on the Renormalization Group Approach*
>>
>> Pak Kau Lim (University of California, Riverside)
>>
>> *Abstract:* Before shifting my focus to my works, I'd like to review a
>> series of background materials until mid-summer. These are broader topics
>> that are either related to my research or materials that I found
>> interesting but have yet to encounter. In my upcoming PASS talk on Monday,
>> I will discuss the renormalization group approach in lower dimension
>> condensed matter theories.
>>
>> Monday, June 6, 2022 at 4 pm
>> Physics 3027 (Nebula Room)
>>
>> Details of the PASS program, please find here [Program
>> <https://jibancat.github.io/ucr-student-seminars/program/index.html>].
>>
>> We have three presenters (Mahdi Qezlou, Reza Monadi, and Elizabeth
>> Finney) queued in the Summer Quarter. We will send another email in the
>> first week of the summer to determine the date/time for the summer PASS
>> series since people's availability might change.
>>
>> To submit abstracts for Summer Quarter: [Abstract Submission
>> <https://jibancat.github.io/ucr-student-seminars/registration/index.html>
>> ].
>>
>> Hope to see you there!
>> Ming-Feng Ho
>>
>>
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