wycx
Joined 14 years ago
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875
Submissions
353
Member since
Jan 29
Recent submissions
Comment · 2 months ago
MAXS? As far as I can tell, it is broken by newer versions of Android.
Comment · 8 months ago
I have been having a good time getting Claude to code in the unfashionable choice of Object Pascal/Lazarus. Fast compile times, native cross-platform support, and small statically-linked binaries that should work for years to come in our RAM-constrained future.
Comment · 8 months ago
I have been getting claude to us free pascal/lazarus to write cross-platform (linux qt & gtk, windows and cocoa) apps as well as porting 30-year old abandoned Windows Delphi apps to all three platforms using precisely because I can end up with a small, single binary for distribution after static linking.
I hope that prevalence of AI coding agents might lead to a bit of a revival of RAD tools like lazarus, which seem to me to have a good model for creating cross-platform apps.
Comment · 8 months ago
I have settled on a way to do append only notes by having a "journal" user on my xmpp server, and I take notes by sending them asciidoc formatted messages. I have been too lazy to do it so far, but I could extract the messages from the server and compile them into something more easily browsed.
Comment · 9 months ago
I had a very convenient setup using linked files stored in Dropbox that worked very well for 15 years. The Zotero 6 to 7 upgrade completely broke this, and modified the database so that rollback is not possible. There was no warning that this workflow would be completely broken on upgrade.
Comment · 1 year ago
https://en.wikipedia.org/wiki/Huf_Haus
Construction of a Huf Haus in the UK featured in the 2004 series of Grand Designs.
Comment · 1 year ago
In this context energy=wavelength=frequency, and hard x-rays means x-ray with energies > approx. 5 keV. I am assuming properties they are after in their particular context are <i>tunable</i> hard x-rays with with relatively narrow bandwidth, such that they can tune the energy/frequency/wavelength of their beam to be above the absorption edge of particular elements in the pigments in paintings and compare the x-ray fluorescence maps above and below the absorption so they can see where particular pigments are and thus paintings hidden below the visible painting.
One big advantage synchrotrons have is flux over a broad spectrum. When you want monochromatic x-rays you can start with broad spectrum x-rays from a synchrotron source and throw almost all of the photons away, and still have orders of magnitude more x-rays in your 1 eV bandpass beam than the flux of a laboratory source, (even if it has a peak in its spectrum at the energy you want). The plots on slides 4-6 linked in the first comment [1] demonstrate this clearly.
However, the energy range where inverse compton scattering sources seem most attractive are at energies >100 keV where it appears there is the potential for inverse compton sources to approach and even outperform synchrotron bend-magnet sources (slides 31 to 35), particularly in comparison to bend-magnets/wigglers at synchrotrons with lower storage ring energy than facilities like ESRF (6 GeV). High flux at higher energies (>100 keV) is difficult to generate at the more common 2.0-3.0 GeV storage rings.
[1] https://indico.cern.ch/event/1088510/contributions/4577523/a...
Comment · 2 years ago
Lots of interesting experiments with solar collection here: https://www.youtube.com/@sergiyyurko8668/videos
Comment · 3 years ago
Including one of the hardest of them all: https://en.wikipedia.org/wiki/Allocasuarina_luehmannii
Comment · 4 years ago
McMaster-Carr seems to have done it OK
Comment · 4 years ago
I have progressed from Dokuwiki -> Tiddlywiki -> Gollum.
I can now write everything in asciidoc.
Comment · 5 years ago
The core itself (Xtensa) is from a US company, Tensilica.
Comment · 6 years ago
I have also found this useful:
http://brettbeauregard.com/blog/2011/04/improving-the-beginn...
Comment · 7 years ago
Radioactivity of rocks is caused by only a few elements so is useful to consider the minerals in which those elements are hosted. i.e. the radioactivity is not evenly distributed among the minerals that comprise granite. The elements that contribute most to the radioactivity of granite are U, Th and K. The K is mostly contained in alkali feldspar and mica. The U and Th are contained in accessory minerals, such as monazite and zircon. Monazite and zircon are dense, robust minerals, which means they persist after weathering and go on to accumulate in detrital sediments, and we call the sediments in which they are concentrated heavy mineral sands. Alkali feldspar is much less robust and rarely survives in mature sediments (i.e. quartz-rich sands), instead all the K ends up in clays.
When heavy mineral sands are processed to extract the Ti and Zr ( from rutile, illmenite, zircon), the residual concentrate is rich in monazite. This material comprises the bulk of our easily accessible Th reserves. However, you can't just leave this monazite-rich material lying around heaps, as it creates a windborne radioactive dust hazard, so it gets mixed back in with the other light material. This is a bit of a shame. All that energy and effort is expended to extract the heavy minerals, but as there is no immediate market for the monazite, and it is a liability to keep it in the extracted state, all that work hard work is undone to mitigate the dust hazard and it gets mixed back with the quartz etc.
So it is perhaps somewhat ironic that we mine beaches to get the minerals that are the source of the bulk of the radioactivity of granites.