jarvist

5 ms·

1.
by jarvist 13d ago
These approaches always measure the wrong thing though - the average carbon cost of electricity. What you need to know is the marginal carbon cost, which will be much less variable as almost all dispatchable generation is fossil. So yes, yo
2.
by jarvist 2mo ago
The statement that electric pressure cookers measure pressure absolutely (i.e. not relative to local pressure) was news to me, and definitely a good hack to know if you're living at altitude.
3.
by jarvist 2mo ago
For my textbooks, I use little record cards. I write the book reference on the top line, then whatever notes or quotations etc. If it's a heavily referred to book, I sometimes use different colour cards to mean different things. When I
4.
by jarvist 7mo ago
I've always had watch history off, but my searches now return a couple of pages of short form nonsense, before my actual results.
5.
by jarvist 1y ago
Absolutely. Key for me was to invite children's friends (and family) along, host it in our house and make it a recurring weekly thing. The books (presumably you also have these from the MSRI's 'Mathematical Circles Library&#x
6.
by jarvist 2y ago
It's been really rewarding. I definitely recommend jumping in. I started with my reception-age child (+ school friends), and have just extended it to their younger sibling (+ friends from nursery). Your 3.5 year old will have started t
7.
by jarvist 2y ago
Practically speaking (running a little maths circle in the UK for my children, and some of their friends from nursery and primary school), I have found the Nrich website to be the single best source of resources: https://nrich.m
8.
by jarvist 2y ago
What do you not like about Feynman's "little arrows" / rotating clock hands in the QED book? I can't think of a more simple metaphor for the exponential of a complex phase, exp(i omega t). I suppose you could try an
9.
by jarvist 2y ago
That's great! Their motivation & updates seem very sensible. Calculus Made Easy is a very nice compact book for university students who have started to forgot their high school training, and I will certainly point people in the dir
10.
by jarvist 2y ago
Water is incredibly efficient at transmitting sound.
11.
by jarvist 2y ago
The mug will attenuate almost all the signal. Maybe try with a disposable plastic cup?
12.
by jarvist 2y ago
This is super useful to know about! The sprite designer & waveform editor / tracker is a really good creative introduction to computers for small children. And you can jump straight in to doing this with the above web link. (For t
13.
by jarvist 2y ago
But it is theatre. A single £0.01 Zener diode can generate vastly more guaranteed (by quantum mechanics!) randomness, without all the possibility of failure, entropy leaking etc.
14.
by jarvist 3y ago
Yes, but what you are missing is that behaviour has changed! We have that level of net road deaths today, given that kids are being driven everywhere. So you can't state from your data that it has got safer: you need the child deaths&#
15.
by jarvist 3y ago
The speed of sound does not depend on pressure, only temperature. I suspect this is occurring because the (sonic) flow through the nozzle cools as it expands, therefore the speed of sound drops, making the same flow now supersonic in the co
16.
by jarvist 3y ago
There's also a fantastic Youtube video in a neutron beam facility of a Moka pot, in which you can see the full process of brewing. The water and plastic handle appear 'black' as hydrogen scatters neutrons so strongly. https:
17.
by jarvist 3y ago
A key quality of life improvement for me was to realise that you can eject the grounds from the filter funnel by putting the tube to your lips and blowing gently, ejecting the coffee puck into the food waste / compost bin. The Moka pot
18.
by jarvist 3y ago
I'm certain all the reactors will SCRAM (shut down the nuclear chain reaction), but then every large (i.e. all) power reactors need active cooling to remove the decay heat and prevent a core meltdown. (This is what happened at Fukushi
19.
by jarvist 3y ago
Strangely this piece doesn't mention nuclear power plants: with 400 or so operational nuclear power plants worldwide, that's a lot of core meltdowns. Similarly I would imagine there would be a lot of oil in the sea, if suddenly al
20.
by jarvist 3y ago
My experience is a first implementation / novice programmer will write Julia code of a similar speed to python. But then an intermediate Julia programmer can adapt that same code to be of order C / Fortran performance, without sto
21.
by jarvist 3y ago
Why would you want control? That means more bureaucracy you need to do yourself. In the UK (and I believe everywhere with a well functioning research culture), the 'Haldane principle' means that research funding is decided by rese
22.
by jarvist 3y ago
https://github.com/whitead/paper-qa >This is a minimal package for doing question and answering from PDFs or text files (which can be raw HTML). It strives to give very good answers, with no hallucinations, by groun
23.
by jarvist 3y ago
Interestingly, in the UK I get this: Me: As a part of Google, do you have my personal info? Bard: I do not have your personal information. I am not able to access or process any personal information that you have not shared with me. GDPR le
24.
by jarvist 4y ago
It's certainly not perfect (still a bit coarse, doesn't state what % of the work is done, doesn't state which parts of the paper the author worked on), but CRediT statements are gaining increasing traction in the published li
25.
by jarvist 4y ago
I don't think this is true, at least in the UK. The BBC computer literacy project meant that there were BBC Model Bs in every UK school, with tie-in educational materials. In the early 90s my entire class at a run of the mill state pri
26.
by jarvist 4y ago
Well write it up and put it on the ArXiV / send it to the author for version 2!
27.
by jarvist 5y ago
The web plugin actually falls back to 'web page with snapshot' if it can't detect a journal paper, which in many ways is better than trying to drag around big PDF binaries.
28.
by jarvist 5y ago
You're also missing 'soon' and 'imminent' (along with 'later' have a very specific and important meaning). And no 'sea states'? Currently there's 'Very rough or high, occasionally very
29.
by jarvist 5y ago
Physics is really a working knowledge, like computer programming. You have to be able to solve problems. All the 'practical' and 'intuitive' aspects of theoretical physics are built by working on problem sheets. A lot of
30.
by jarvist 5y ago
Could you point me in the direction of a single YouTube channel that goes into more depth than a Masters program? Other than occasional captured lectures, everything 'educational' on YouTube seems to me to be optimising for that T

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