Tootfinder

Tilbage på Wasa station for juleaftensdag -
Jeg skal snakke med @andreasnyholm.bsky.social på TV2 news cirka kl12.15 om vores #iQ2300 projekt og hvad det er jeg egentlig gŸre i Antarktis lige nu, hvis i er ikke ellers optaget og synes det lyder interessant..

it is funny to me that the metaphor for "installing software" is still unboxing an optical disc, despite nobody in the last 15 years actually shipping software that way

Time to investigate my dad's turntable; a Pioneer PL-15R; so at 33.33RPM, and with a disk with 64 edges, that should be 33.33/60*64=35.6Hz - so seeing 35.7Hz off my hacky photodiode sensor makes me very happy; although it's varying a little, but my scopes frequency counter is based off it's display, so hmm. And it's FFT won't go down that low really.

Olisiko klassinen off-by-one bugi?
https://www.traficom.fi/fi/ajankohtaista/opetuslupahakemuksen-jattaminen-sahkoisessa-palvelussa-ei-onnistu-syntymapaivana

Opetuslupahakemuksen jättäminen sähköisessä palvelussa ei onnistu syntymäpäivänä | Traficom
Opetuslupahakemusta ei tällä hetkellä voi tehdä sähköisessä asioinnissa samana päivänä kuin oppilas täyttää vaadittavan iän.

#Zhongmou wins U.S. #FDA clearance for China's first optogenetic human trials https://www.linkedin.com/p…

Zhongmou Wins U.S. FDA Clearance for China’s First Optogenetic Human Trials
ZM-02 becomes the first China-origin optogenetic therapy authorized for U.S.

How Nokia has reinvented itself for the AI revolution by expanding into cloud services, data centers, and optical networks, and by partnering with Nvidia (Kieran Smith/Financial Times)

For optics large enough there is an amazing #comet in the - southern - sky right now, C/2024 E1 (Wierzchos): an image taken by Gerald Rhemann and Michael Jäger remotely in Namibia, https://www.facebook.com/photo/?fbid=25304451112588622
Date: 26 01 2026 UT 18:47
Location: Farm Tivoli, Namibia
Telescope: ASA Astrograph 12" f3.6
Camera: ZWO ASI 6200 MM Pro
Mount: ASA DDM 85
Exp.Time: LRGB 7.8/5/5/5 min.

High-precision luminescence cryothermometry strategy by using hyperfine structure
Marina N. Popova, Mosab Diab, Boris Z. Malkin
https://arxiv.org/abs/2511.19088 https://arxiv.org/pdf/2511.19088 https://arxiv.org/html/2511.19088
arXiv:2511.19088v1 Announce Type: new
Abstract: A novel, to the best of our knowledge, ultralow-temperature luminescence thermometry strategy is proposed, based on a measurement of relative intensities of hyperfine components in the spectra of Ho$^{3 }$ ions doped into a crystal. A $^{7}$LiYF$_4$:Ho$^{3 }$ crystal is chosen as an example. First, we show that temperatures in the range 10-35 K can be measured using the Boltzmann behavior of the populations of crystal-field levels separated by an energy interval of 23 cm$^{-1}$. Then we select the 6089 cm$^{-1}$ line of the holmium $^5I_5 \rightarrow ^5I_7$ transition, which has a well-resolved hyperfine structure and falls within the transparency window of optical fibers (telecommunication S band), to demonstrate the possibility of measuring temperatures below 3 K. The temperature $T$ is determined by a least-squares fit to the measured intensities of all eight hyperfine components using the dependence $I(\nu) = I_1 \exp(-b\nu)$, where $I_1$ and $b = a\nu \frac{\nu}{kT}$ are fitting parameters and a accounts for intensity variations due to mixing of wave functions of different crystal-field levels by the hyperfine interaction. In this method, the absolute and relative thermal sensitivities grow at $T$ approaching zero as $\frac{1}{T^2}$.and $\frac{1}{T}$, respectively. We theoretically considered the intensity distributions within hyperfine manifolds and compared the results with experimental data. Application of the method to experimentally measured relative intensities of hyperfine components of the 6089 cm$^{-1}$ PL line yielded $T = 3.7 \pm 0.2$ K. For a temperature of 1 K, an order of magnitude better accuracy is expected.
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