Archive for June, 2022

A summer solstice remote presentation for TLS Tautenburg

Posted June 21, 2022 By grigoris

In March I got invited to give a talk for the Thüringer Landessternwarte Tautenburg group. Back then June 21 looked like a far date in a relative relaxed time period. I was so wrong… they are so hectic days!

Nevertheless, I managed to prepare a talk entitled: “The ASSESS classifier: a machine-learning tool to uncover populations of evolved massive stars in nearby galaxies”. I tried to prepare a more general introduction to the massive stars and their evolution, along with the issues we are facing as far as mass loss. I highlighted the importance of the ASSESS project and the provide a short description of what is ASSESS all about. Then I described the machine-learning classifier we developed and our first results from this.

Although pressing, at the end I really enjoyed this talk!

Filed in Astronomy | Tagged: ,

Lenovo X-1 not charging … frustration solved!

Posted June 20, 2022 By grigoris

Last night I was working on the laptop when naturally it asked for some power. Typically, when you plug in the power is should charge the battery, right? Well… no, it didn’t do that at all!

And then dread start developing! What is wrong? Is it the plug, the connector or even worse the port? As it was late I called it a day and went to bed. Today, I started by trying another power cable and finally another charger … in vain! Then, Tassos K. told me the obvious “Why you don’t look it up, somebody should have written about it“.

And I did, to find out this post by Steven Allen “Fix For Lenovo X1 Carbon Not Charging“. The solution is to reset the batter, and as described:

  1. Unplug from any power sources (this won’t work if you don’t do this).
  2. Reboot into the BIOS setup (F1 on boot).
  3. Navigate to the Power menu.
  4. Select the “Disable built-in battery” option.
  5. Wait for the laptop to power off and then wait 30 seconds.
  6. Connect the power and start the laptop.

This will temporarily disable the battery which seems to reset any “bad charger” bits. And this works in Gen 6 also!

Hopefully, this will save others some time and frustration.

Steven Allen

You bet! Only the idea that I would have to return the laptop for inspection and the time lost is simply put … terrifying !

And there is light !

Filed in Astronomy | Tagged: , ,

In-person participation at IAUS 361

Posted June 1, 2022 By grigoris

Finally after two years of pandemic and two postponements of the IAU Symposium 361: “Massive Stars Near and Far” it was held in Ballyconnell, Ireland in the week of 8-13 May 2022.

It was really a great opportunity. Not only I managed to meet in-person people and collaborators that I met through zoom meetings but actually it was the first time (since 2020) to meet also my colleagues working in the ASSESS project (while some of them for the first time!).

The event was of course a great place to present our latest results. I got the privilege to have a talk about our latest results from the machine-learning classifier we have developed (see this post).

  • Talk: “Introducing the ASSESS project: Episodic Mass Loss in Evolved Massive Stars – Key to Understanding the Explosive Early Universe” – Alceste Bonanos
  • Talk: “Using machine-learning to investigate the populations of dusty evolved stars in various metallicities” – Grigoris Maravelias
  • Poster: “Progenitors and companions of stripped-envelope supernovae” – Manos Zapartas
  • Poster: “Properties of dusty Red Supergiant stars in the Magellanic Clouds” – Stephan de Wit
  • Poster: “ASSESSing evolved massive stars in NGC 6822 and IC 10” – Gonzalo Munoz Sanchez
From left: Grigoris Maravelias, Stephan de Wit, Konstantinos Antoniadis, Frank Tramper, Alceste Bonanos, Manos Zapartas, Gonzalo Munoz Sanchez, Evangelia Christodoulou
Filed in Astronomy | Tagged: , ,