matthiasl

4 ms·

1.
by matthiasl 6mo ago
"What is the mechanism that increases risk for MOV-sourced fires in this arrangement?" I wondered the same thing, and failed to find a satisfying explanation. I can find plenty of reports of MOV fires, especially in situations whe
2.
by matthiasl 7mo ago
It took me a while to realise that you were responding to the article, not a comment here. You're right in correcting the article, but I'd like to add that for probably around a decade, Erlang had 'sender punishment', wh
3.
by matthiasl 11mo ago
Right, it's TX-only. The article says so explicitly halfway through: "As before, this is a transmit-only proof of concept" I didn't notice that on my first reading.
4.
by matthiasl 1y ago
> All the designs I know of have a pumped (active) cooling loop for the reactor, then a secondary loop where the coolant (typically water) evaporates and drives a turbine, [...] You don't want potentially radioactive water to intera
5.
by matthiasl 2y ago
Assuming you're refering to Hövding, the recall was overturned on appeal, back in 2023, but the company went bankrupt anyway: https://discerningcyclist.com/hovding-bankruptcy/ In some types of crashes, the Hövding
6.
by matthiasl 2y ago
I looked at a London telephone book from 1979, when I think the record was released. Most of the phone numbers were something like 01 361 1234, i.e. seven digits after the 01 area code. The _361_ part was bold, so I think that was an exchan
7.
by matthiasl 2y ago
(Author here) No contradiction. I think what happened is 1. The recording engineer dialled the operator. Could have been pulse dialling, could have been DTMF, doesn't matter. 2. Operator answered and the engineer said "I'd li
8.
by matthiasl 2y ago
659 8890 That one's just ordinary DTMF. I recorded the audio, trimmed it manually and then made a spectrogram like this: sox gun1.wav -n rate 4k spectrogram -m -y 500 The 'rate' switch is to cut down on how much of t
9.
by matthiasl 2y ago
You're right; I think CCITT5 is just another name for SS5, because different groups were writing standards. Bell called it one thing, CCITT (an international standards group) called it another thing. And then in the 1990s, the CCITT re
10.
by matthiasl 2y ago
The discussion is new to me. I started analysing the audio because someone sent me a link to the film (The Wall) on youtube and asked me about the signalling. Once I'd decoded the telephone number, I tried googling it, to see if someon
11.
by matthiasl 2y ago
Interesting. Normally, films use deliberately fictious numbers, e.g. in the US it's always xxx555xxxxxx. Wikipedia says the UK uses various area codes for the same thing, including 011x and 01x1. The Pink Floyd number is a bit unusual-
12.
by matthiasl 2y ago
Author here. Yep, 44 is the UK country code. The problem I got stuck on is that the rest of the number, 1831, didn't make sense. I assumed the number was complete, since it had the right start and stop signalling (KP1/KF). It&#x27
13.
Decoding the telephony signals in Pink Floyd's 'The Wall'(corelatus.com)
417 points by matthiasl 2y ago|131 comments
14.
by matthiasl 3y ago
There's no smoke coming out. Best guess: you're confused by the word "smokestack". Smokestack is a synonym for chimney. The power station is closed. The chimneys are still there, but there's no smoke coming out of t
15.
by matthiasl 3y ago
ATM cells have 48 byte payloads. Supposedly that was because different groups involved in the standardisation process wanted either 32 or 64 byte payloads.
16.
by matthiasl 4y ago
Not important to the conclusion or reasoning... but Stevena's post says: "the whole team working on Erlang quit and started their own company." The same event as described in "A history of Erlang": "
17.
by matthiasl 4y ago
To put some numbers on "much worse" versus "not much worse": The best window I can find from the major Danish manufacturer Velfac has a total U-value of 0.82 W/°K/m² [1]. It's a triple-glazed window with a
18.
by matthiasl 4y ago
Schroedingersat> ...albedo increase... You mean _decrease_, right?
19.
by matthiasl 4y ago
> Electric heat pumps actually don't work in very cold weather. I think that statement needs to be qualified and quantified. Qualified: your claim is probably only intended to apply to air-source heat pumps, not ground-source heat p
20.
by matthiasl 4y ago
Do you have some numbers to back your "strong" doubts? One widely cited source is the 'Lazard' report: https://www.lazard.com/perspective/levelized-cost-of-energy-... it puts onshore wind at between
21.
by matthiasl 6y ago
Rurban wrote: "the very best (Formula 1) at 10 KHz". how much of the above is a typo and how much is real? I'm pretty sure 'KHz' is a typo which maybe should be kHz as in the start of the sentence. But even then, wh
22.
by matthiasl 6y ago
> you can't just throw around numbers without explaining exactly what they mean or where they come from. In the interview, Gieseke says influenza kills 1000 to 2000 people per year in Sweden, it's part of the exchange starting
23.
by matthiasl 6y ago
That difference seems to arise because the report you cite uses a broad definition of influenza deaths. Page 2 says they're counting patients who "have influenza as a contributing or underlying cause of death, plus patients who re
24.
by matthiasl 6y ago
I also share your concern about claims made by Gieseke. The article quotes Gieseke as saying "The real death toll, he suggested, will be in the region of a severe influenza season — maybe double that at most". Sweden's offici
25.
by matthiasl 6y ago
"ICU admissions [...] have very little lag." Sweden's ICU admissions number for a particular day usually takes a week or two to settle down. For instance, here's how the numbers were updated each following day for the nu
26.
by matthiasl 7y ago
One way to classify heat pumps is by the source and destination of the heat. - air/air - air/water (i.e. an "air pump that heats a liquid in pipes") - ground/water are all commercially available, at wid
27.
by matthiasl 7y ago
I think you misunderstood the parent. In this context, 'behind' means less visible, as in a person working in the background. Example: 'Behind every “big break” is a lot of blood sweat and tears.' Example: Giorgio Morode
28.
by matthiasl 7y ago
At least 2 times and as much as 5 times seems surprisingly bad. Do you have a source or a concrete example for that? The most plausible explanation I can think of for what you're saying is that you're comparing an evaporative cool
29.
by matthiasl 7y ago
"The lack of a tax is not a subsidy." -- dsfyu404ed Do you have a reference for that claim? Other sources explicitly count tax breaks as a type of subsidy, for instance "In countries with well-developed tax systems, subsidies
30.
by matthiasl 7y ago
"Remelting glass to make more glass is more energy intensive than making new glass."---hdfbdtbcdg The first source I found on this subject directly contradicts your claim: "The primary energy consumption totals are 17.0 x 10^

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