Tootfinder

Dringende oproep om ‘onzinnige’ regels rond nieuwbouw te schrappen: ‘We slaan door’ | Wonen | #gelderlander
https://www.gelderlander.nl/wo…

Some statistics about all robotic #LunarLanding attempts so far from 1965 to 2025 compiled from https://en.wikipedia.org/wiki/List_of_missions_to_the_Moon and https://scicomm.xyz/@AkaSci@fosstodon.org/114636519291241321 in which I only count those for which descent to the surface had been initiated, not missions lost at launch or on the way - in a nutshell ~70% of all landings by government agencies went well (essentially the same rate 60 years ago and now!) but only ~30% by private companies. Here goes ...
There have been two separate periods of soft lunar landing attempts of ca. a dozen years each, from 1965 to 1976 and 2013 to 2025 (ongoing) with a huge gap between them.
In the first interval there were 20 attempts with 13 successes (Luna 9, 13, 16, 17, 19, 20, 21 and 24 and Surveyor 1, 3, 5, 6 and 7), one partial success (Luna 23, counting as 50%) and 6 failures (Luna 5, 7, 8, 15 and 18 and Surveyor 4), so the success rate was 13.5/20 = 68 %. All missions were by - the Soviet and U.S. - governments.
In the second interval there were so far 14 attempts with 6 full successes (Chang'e-3, 4, 5 and 6, Vikram 2 and Blue Ghost), three partial successes (SLIM, IM-1 and 2, counting as 75%, 50% and 25%, respectively) and 5 failures (Beresheet, Vikram 1, Hakuto-R 1 and 2 and Luna 25) so the success rate was 7.5 / 14 = 54%.
But looking only at the government missions it was 72%, slighly up from 50 years ago. While for the commercial attempts it was only 29%. In total the success rate was 19 (18 government-run) missions out of 34 (28) attempts or 62% but 69% for governments only. And if you throw in the 6 Apollo landings, the total success rate rises to 68% and the government-only rate goes even up to 75%.

“This considers how two modern cameras handle a difficult color challenge, illustrated by photos of a perfect rose and a piano.” https://www.tbray.org/ongoing/When/202x/2025/05/31/Colors

Perfectly Different Colors

9 Jahre alt - #Skoda #Yeti beim #TÜV ohne Mängel.
Vielleicht behalte ich das Auto doch noch ein bisschen.

9 Jahre alt – Skoda Yeti ohne Mängel
Mitte 2016 wurde unser Auto zum ersten Mal zugelassen. Ein Dreivierteljahr später, habe ich es aus Filderstadt nach Bad Oeynhausen geholt. Seitdem sind wir damit knapp 60 TKM gefahren und insgesamt hat er 73 TKM auf dem Zähler. Größere Reparaturen …

9 Jahre alt – Skoda Yeti ohne Mängel Weiterlesen »

Localised and Delocalised Charge Distribution in a Diamine Cation and Rydberg Excited State: A Challenging Test for Density Functionals
Benedikt O. Birgisson, Marta Ga{\l}y\'nska, Hemanadhan Myneni, Elvar \"O. J\'onsson, Ragnar Bjornsson, Hannes J\'onsson
https://arxiv.org/abs/2506.05077

Localised and Delocalised Charge Distribution in a Diamine Cation and Rydberg Excited State: A Challenging Test for Density Functionals
The balance between localised and delocalised electron distribution in the N,N'-dimethylpiperazine (DMP) molecule in the 3s Rydberg excited state and in the fully ionised DMP$^+$ provides a valuable test of density functionals, in particular the weight of Fock exchange (FE) in hybrid functionals and the scaling of explicit orbital-based self-interaction correction (SIC) applied to less elaborate functionals. We present results of calculations using density functionals of all rungs of Jacob's la…

This https://arxiv.org/abs/2410.22882 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^+ e^-$ collisions
We present the results of Phase I of an ongoing review of Monte Carlo tools relevant for low-energy hadronic cross sections. This includes a detailed comparison of Monte Carlo codes for electron-positron scattering into a muon pair, pion pair, and electron pair, for scan and radiative-return experiments. After discussing the various approaches that are used and effects that are included, we show differential cross sections obtained with AfkQed, BabaYaga@NLO, KKMC, MCGPJ, McMule, Phokhara, and S…

This https://arxiv.org/abs/2411.07077 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A stable one-synchronization variant of reorthogonalized block classical Gram--Schmidt
The block classical Gram--Schmidt (BCGS) algorithm and its reorthogonalized variant are widely-used methods for computing the economic QR factorization of block columns $X$ due to their lower communication cost compared to other approaches such as modified Gram--Schmidt and Householder QR. To further reduce communication, i.e., synchronization, there has been a long ongoing search for a variant of reorthogonalized BCGS variant that achieves $O(u)$ loss of orthogonality while requiring only \emp…

This https://arxiv.org/abs/2505.11292 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Status of the International Linear Collider
This paper is not a proposal for a CERN future project but provides information on the International Linear Collider (ILC) considered for Japan in order to facilitate the European Strategy discussion in a global context. It describes progress to date, ongoing engineering studies, updated cost estimate for the machine at $\sqrt{s}=250~\rm GeV$ and the situation in Japan. The physics of the ILC is not presented here, but jointly for all Linear Collider projects in a separate document ``A Linear C…

It’s language pedantry! No, it’s math pedantry! Anyhow, “Comparing Numbers Badly” gripes about the mis-use of “order(s) of magnitude” and percentages in comparing numbers: https://www.tbray.org/ongoing/When/202x/2025/05/30/Number-Comparison-Representa…

Comparing Numbers Badly

Here are a couple of springtime pictures with small associated stories. It’s a thrill to find something positive to write about: https://www.tbray.org/ongoing/When/202x/2025/05/27/Happy-Colors

CL XLVI: Happy Colors