Hoo boy, I have six documents to produce in the span of a month. Documenting everything from requirements and interface stuff to handling procedures and critical points

Hard mode: talking to my laser physicist friend about his work without going pew pew

Had some mysterious biasing trouble with the instrument today. Turned out to just be an addressing problem 😌

Finally got a website up for the project I've been employed in at the math department: fmigo.net/

To quote myself:
"FMIGo! is a set of Free Software tools aimed at the Functional Mockup Interface (FMI) standard. FMI is a standard for packaging simulations into .zip files called Functional Mockup Units (FMUs). Each FMU contains an XML file describing the system contained within, and a set of binaries, data and possibly source code"

Messing around with formally proving that a simple RLE compressor/decompressor in -c can't crash. No problem there.
Proving that the output from compression+decompression is identical to the input on the other hand.. not so easy!

thardin boosted

Did you know that you don't need to use link shorteners (bit.ly, etc.) on Mastodon? All links, no matter how long, only count for 23 characters against your 500 limit!

(And since link shorteners are bad for user experience and break the web, there's almost no good reason to use 'em! 😄)

@eredondo Question for you as a battery person: what do you think of the carbon batteries being developed by Robert Murray-Smith? I find it interesting, but it's hard for me to tell how much of it is "real" since he handwaves aspects of it and I'm not a chemist

LaTeX woes: got a long word with underscores in my text, and pdflatex seems to think it should go off the side of the page instead of putting in a line break...

Is there some way to always expand posts? Having to click the thing is a bit of a nuisance

A shot from after one of today's test. To the left is our fieldmill instrument, to the right the grid cube we use to apply various electric fields to it. So far our new rotor grounding method looks promising

Updating our instrument manual with detailed "first run" instructions

Crisis averted, kinda: turns out it's just that I'm running the boards too fast for 3.3V. Downside is I'm limited to 9.216 MHz at most

So we got new CPU bords today as well. I solder one up, connect it, program it, everything works fine. Then after a while I see garbage on the serial port, unstable current draw. I disconnect everything and measure a semi-short on the 3.3V bus. It. Just. Never. Ends! 😣

I forgot to add, this and all other PCBs in our projects have been drawn using , a libre EDA CAD tool: kicad-pcb.org/
KiCAD has improved substantially in recent years, thanks to efforts by CERN. An excellent example of how public funds put toward free software benefits everyone :)

New PCBs arrived this week, silver plated and a beastly 3.7 mm thick. Pliers won't cut it when it comes to removing the frames, this is clearly a job for a dremel :]

Spent some time this week implementing my own solver for Laplace's equation in GNU Octave, for FEM:ing electrostatics, and for my own sanity. Attached pic shows computed voltages for a setup in the lab. I even managed to speed the solver up considerably using BiCGSTAB :]

Then today a friend of mine tipped me about , a libre set of FEM tools. Is anyone on here familiar with it? It seems suitable for my needs, and having something mature other than COMSOL would be nice

Incidentally, does anyone know what "centimeters of capacity" means circa 1932? I feel like there should be a straightforward conversion to picofarads but I can't find anything

I suppose an is in order:

Hello! My name is Tomas. I am a research engineer at Umeå University, MSc in Computer Science. Currently working in the field of lunar ⚡. If all goes well we'll be sending a set of field mills to the lunar surface some time in 2019!

I'm also involved in the scene under the callsign SA2TMS.

I have some other accounts elsewhere in the fediverse, but this feels like a good place for seriousposting..

Scholar Social

A Mastodon instance for academics

Scholar Social is a microblogging platform for researchers, grad students, librarians, archivists, undergrads, academically inclined high schoolers, educators of all levels, journal editors, research assistants, professors, administrators—anyone involved in academia who is willing to engage with others respectfully.

We strive to be a safe space for queer people and other minorities, recognizing that there can only be academic freedom where the existence and validity of interlocutors' identities is taken as axiomatic.

"A Mastodon profile you can be proud to put on the last slide of a presentation at a conference"

"Official" monthly journal club!

(Participation is, of course, optional)

Scholar Social features a monthly "official" journal club, in which we try to read and comment on a paper of interest.

Any user of Scholar Social can suggest an article by sending the DOI by direct message to @socrates@scholar.social and one will be chosen by random lottery on the last day of the month. We ask that you only submit articles that are from *outside* your own field of study to try to ensure that the papers we read are accessible and interesting to non-experts.

Read more ...