brunohaid

That one‘s gold too, but for me it was the other way round - needed Hartley to fully grasp Alpha Phoenix.

Understanding waves feels a bit like the bell curve meme for me: you start with the mental water model, and eventually end up with it again.

Or Feynman: you hear him helpfully talk about bouncy rubber balls, then learn a bunch of stuff over the next decade, and randomly listen to the same lecture again, and suddenly all sorts of „aaaah, that’s what he meant“ lightbulbs go off.

Got it - haven't read it yet but, also thanks to your pointer, very much looking forward to!

Much appreciated! Maybe the impedance added some colorful garnish to your memory... :-)

Sibling thread?

<3 awesome - this one https://boulderschool.yale.edu/sites/default/files/files/Day... ?

Not a religious person, but there's something deeply spiritual about Katalin Karikó type characters, who throughout the ages stuck with their curiosities and craft for the craft's sake.

Tried skimming the page but couldn't find the answer: do we know if the neural connection impedance is perfectly matched? It looks quite organic in shape, with teardrop connections and so on, but curious how nature did that job?

Excellent post!

Controlled impedance took me a long time to wrap my head around when starting PCB design, the moment when it finally clicked was watching this excellent AlphaPhoenix video https://www.youtube.com/watch?v=2AXv49dDQJw& asking and practically demonstrating the simple question:

When you flip on a switch, to turn on anything, send data, morse something etc, how does the circuit know how much current the load at the other end needs?

Spoiler: Given that information can't travel faster than light, the simple answer is: it doesn't. So it just guesses and adjusts, which you don't want as it gives you exactly the ringing etc Heaviside identified. The video is a nice complement, as it perfectly visualizes the issues at play.

It's a pretty wild bit of understanding to have, even in simple situations like flipping on a light switch.

Wow, that is indeed quite strange - that’s a very high speed for having scraped along a 9000 foot runway.

They either landed extremely long or it rhymes a bit with the Pakistani Airlines accident of an attempted gear-up landing go around a couple of years back, both not implausible in the context of already dealing with a bird strike. There are also edge cases where the plane won’t yell Landing Gear at you, and it‘s really really hard to get a 737 to a point where you can’t lower the gear anymore (multiple hydraulic systems failing, gravity pins and pulleys as well, Stig Aviation did a great video on that.)

Pretty sure there was no EMAS, as the plane dips down into the dirt at the end of the runway right away, ie not that much lift, and EMAS would do orders of magnitude more arresting.

That’s what got me excited about the movie in the first place - but leaving the theatre I felt like Graeber would be spinning in his grave.

A Randian California Ideology hero is the exact opposite of what he spent his life arguing and fighting for.

And it reminded me of the Adam Curtis line: “we now all live in the mind of a dying hippie”. It seems like Coppola fits that bill perfectly.

Steven Colbert and Anderson Cooper once had a wonderful, deeply human conversation about grief and loss, which also touches briefly upon Colbert’s mom losing two sons and her husband in a plane crash:

https://www.youtube.com/watch?v=YB46h1koicQ

May you find similar comfort, one day.

~ weekly, globally.

Still fascinating how presciently Matt Stoller nailed the issue 5 years ago:

Let’s start by admiring the company that was Boeing, so we can know what has been lost. As one journalist put it in 2000, “Boeing has always been less a business than an association of engineers devoted to building amazing flying machines.”

https://www.thebignewsletter.com/p/the-coming-boeing-bailout

Solidworks and Altium (mostly Git based by now) output, as well as Google Docs / Sheets documentation, which then all gets pulled into prettified Indesign pdf Books automatically for users / rest of the team.

http://emsoftware.com/products/docsflow/ for GSuite to Indesign.

Absolutely right!

Point was that if the taxi clearance didn't include "hold (short of 34R)" it might be seen as contributing factor in line with ICAO[1] or FAA recommendations.

Also quite terrifying that, given all the equipment at Haneda and according to https://www.youtube.com/watch?v=6NbVdIoJsHY, around 2:45, with taxi lights fully visible at 2:53, the DH8 was lined up on the runway for more than a minute before being run over by the A350.

But as you say, preliminary report should already have a clear timeline of the tower tapes.

1: https://www.icao.int/safety/runwaysafety/documents%20and%20t...

Re clearance/cause: VASA https://www.youtube.com/watch?v=fItu5qM7QfE also couldn't make it out, but it sounds like the Coast Guard Dash 8 got a not really perfect taxi instruction (neither "hold short" nor "line up and wait") to one of the other C* intersections leading onto 34R while a Delta flight occupied C1, but entered the runway anyway. The A350 got a proper clearance it read back correctly.

Also looks like all C hold short lines have embedded guard lights - ie the stop "bar" on the way to the runway should have been flashing brightly.

* https://www.anaas.ana-g.com/img/business/general_aviation/pd...

Definitely better links than Daily Mirror out there, avherald.com unfortunately overwhelmed, but in terms of discussion:

- Crazy how well the carbon fiber A350 held up given that it seems to have landed pretty much directly on a Dash 8 (RIP Coast Guard team). Looks like trading long term flammability for initial rigidity lived up to the design intent.

- Excellent evacuation job, especially as it looks like on some videos that the crew was unable to shut down the right engine, rendering the entire right side unusable (severed lines given the severe belly damage?) UPDATE: they actually did use the front right exit nevertheless https://x.com/tanakamaru1999/status/1742132422005981578

- Don’t have headphones with me and in a public space, but landing / takeoff clearances should be somewhere in https://archive.liveatc.net/rjtt/RJTT-Twr-TCA-Jan-02-2024-08... if someone wants to try and find them (timestamps towards end of url come in 30 minute increments).

> Maybe Nordic Semiconductors will make some nice risk-v chips and dev-boards soon.

They are, not as CPU necessarily but for exactly those auxiliary functions: https://blog.nordicsemi.com/getconnected/why-nordic-is-getti...

Broadcast is messaging only, localStorage can elegantly handle messaging and state data.

For anyone who cares enough to watch a 2 hour video on it and hasn’t seen it yet, this Rick Hartley video is the recent gold standard of explaining the issues at play:

https://www.youtube.com/live/ySuUZEjARPY

The mindblowing thing to internalize is that you don’t route energy as electrons through copper traces (they move incredibly slow) but merely use the copper to guide a bunch of waves traveling outside of them, where they are up to all kinds of shenanigans like coupling, reflecting etc.