jarvist

13 ms·

91.
by jarvist 11y ago
Here is a genuinely live, but two dimensional map: http://traintimes.org.uk/map/tube/ You can click on the trains to get ETAs.
92.
by jarvist 11y ago
Scientific computing requires a lot of memory, and a lot of computer time. I think it's fair to say that the underlying libraries (LAPACK,ScaLAPACK, Intel's MKL) are the most intensively optimised code in the world. Most of the no
93.
by jarvist 11y ago
OK; here's a well cited study from 2010 on electric cars: http://pubs.acs.org/doi/abs/10.1021/es903729a "The share of the total environmental impact of E-mobility caused by the battery (measured in
94.
by jarvist 12y ago
I think this is probably true - in the UK (and EU) our kettles are 3 kW, maxing out our 230 V / 13 A plug/sockets. American plugs always seemed relatively anaemic (and scary dangerous - where are the switches? where is the Earth?
95.
by jarvist 12y ago
Landau/Lifshitz are freely available on the Internet archive: https://archive.org/search.php?query=creator%3A%22L.D.+Landa...
96.
by jarvist 12y ago
A xenon tube is not a spark gap, in terms of the early radio receiver 'spark gaps' which were a primitive tuned circuit used to then feed an antenna (it wasn't the spark itself that was used for the transmission). Sparks prod
97.
by jarvist 12y ago
Epoxy resins are pretty transparent by themselves, opaque ones have additional materials or dyes added. Most dyes (also aromatic organics) are not active (i.e. transparent) in the near-IR.
98.
by jarvist 12y ago
I think it's more likely to be the other way round, a lot of plastics are semi-transparent to IR, all block UV extremely strongly (as you start ionising electrons). For instance, black PVC electrician's tape is entirely transparen
99.
by jarvist 12y ago
Lasers generate coherent radiation, the frequency of the light is much more monochromatic (set by the optical cavity) than a bare LED (set by the thermally smeared band gap of the material). Even a very cheap laser diode can have the output
100.
by jarvist 12y ago
Yes, it's what I do when I submit to a journal that accepts submissions as RTF/DOC. It even has acceptable recoding for the maths. http://latex2rtf.sourceforge.net/
101.
by jarvist 12y ago
Closely related is a prior HN discussion[1] on Simon Peyton Jones' talk on "How to write a great research paper"[2]. [1] https://news.ycombinator.com/item?id=6989806 [2] https://www.youtube.com&#x2
102.
by jarvist 12y ago
More or less, you start with a quantum chemical DFT calculation, the Raman frequencies are associated with the vibrations of the molecule (second derivatives of the energy, once you're at the relaxed potential energy state). Raman freq
103.
by jarvist 12y ago
Mixing in the genuine scientific concern about neonicotinoid systematic pesticides with completely off-the-wall worries about cell phone towers and GM crops is just trying to spread uncertainty and doubt. I can't understand why a journ
104.
by jarvist 12y ago
After the big bang and the expansion, and the condensation of energy into matter, the universe was almost entirely hydrogen and helium (i.e. extremely boring). The heavier elements were fused together in the solar furnances (stars). The ea
105.
by jarvist 12y ago
A feature-length special is coming this Christmas: http://www.theguardian.com/tv-and-radio/2014/aug/21/charlie-...
106.
by jarvist 12y ago
Well, the Cochrane review actually found that they possible caused harm: http://www.theguardian.com/commentisfree/2008/apr/26/medical... And then more recently there is evidence that taking vitamin supp
107.
by jarvist 12y ago
The Scholars extension has potential for a shared note-collection / brief summary of research papers. TW5-Scholars direct link: http://tw5.scholars.tiddlyspot.com/
108.
by jarvist 12y ago
I do the same; only with vimwiki (so today's diary is just two key strokes away). https://github.com/vimwiki/vimwiki I recently found a blogpost describing a way to add 'commit hooks' to vimwiki so that
109.
by jarvist 12y ago
The main thing I learnt from playing this game is that we should have given up on High Energy Physics after discovering the Tau-lepton, and gone on to do something more productive with our time, money & human resources...
110.
by jarvist 12y ago
Slides are on GitHub: https://github.com/JuliaCon/presentations I believe the video is heading for their YouTube channel: https://www.youtube.com/user/JuliaLanguage/featured
111.
by jarvist 12y ago
Both the blog post and the grandfather comment refer to gender non-speciic 'people' whereas the paper abstract is clear that the only data collected is on woman. The figure in the blog post is completely spurious: the study does n
112.
by jarvist 12y ago
No it doesn't. It's a crazy bigoted rant with an undercurrent of misogyny. Just the fact that the original 'scientific' study only looked at women implies that something is a bit dodge.
113.
by jarvist 12y ago
Not just this, but the forecasters themselves are (of course!) interested in their own accuracy & predictive power: http://www.metoffice.gov.uk/about-us/who/accuracy/forecasts
114.
by jarvist 12y ago
Large industrial users don't vary their demand much, and actually change when they use it to fit the demand curves (i.e. Aluminium smelters). Peak in the UK is early evening, when people are still working late & also people returni
115.
by jarvist 12y ago
No, it's a reflow battery - meaning you can make the capacity arbitrarily large (literally you have a tank of one redox, a tank of another). Hopefully this will make it much cheaper for large capacities. Yes, it's heavy for the ca
116.
by jarvist 12y ago
A lighter weight approach to latexmk I've recently found is via a Makefile: https://github.com/ransford/pdflatex-makefile There's issues - for instance figure updates don't cause a recompile.