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#matrix

48 posts45 participants1 post today
Public
bob

Sehr angeregte Diskussion zu #Matrix, #Element und Co. im @eigenbaukombinat beim #HaGeWe

Beispielsweise:

* Unsichere Komponenten werden nicht gepatcht
* Sicherheitsfeatures fraglich
* Unternehmen arbeitet nicht mit der OpenSource Community zusammen
* Features werden immer wieder kurzfristig abgeschaltet / geändert
* Kommunikation zwischen Community Matrix Servern immer wieder durch unterschiedliche Versionsstände unmöglich
* Usabilty Probleme

Hab ich noch etwas vergessen?

#Eigenbaukombinat
Public
Niklas Korz

As a headsup, I'll likely stop any engagement in the #Matrix ecosystem, seeing the troubling development of #Synapse alternatives and the massive shortcomings of the protocol in regards to community moderation / defense against spam waves. In particular, I'm planning to shutdown my selfhosted conduwuit instance, and continue using my matrix.org account only for communities where Matrix is pretty much required. I briefly considered migrating to Grapevine, but I don't have the energy.

Public
Jake Hamilton

🚨WARNING🚨

Apparently some #Nix / #NixOS matrix room(s) have gotten csam spam. I have not verified this claim myself, but honestly, we can all probably just not check matrix for a few days until hopefully things are back to normal.

I do *not* know what utilities #Matrix provides to prevent the proliferation of this information. If you joined the room from a different home server then your server may have synchronized the material to your infrastructure.

I think the safest course of action is not opening a matrix client for a few days...

Public
Sven Slootweg

Checked in on my Spaces access control MSC for Matrix. The one that I was told "looks good", and for which an issue was created on Synapse to "implement a prototype" because "it looks compelling".

The issue was created in 2021 and has received zero comments since.

In case you were wondering what the experience is of actually trying to contribute a spec change to #Matrix.

Public
Andrey DarkCat09

This repository was archived by the owner on Apr 11, 2025. It is now read-only.
-- сегодня на гитхабе в репозитории conduwuit

https://girlboss.ceo/~strawberry/conduwuit.txt

всё, что я получила в течение последних 12 месяцев от самых разных людей из коммьюнити матрикса, — постоянные оскорбления, месть, токсичность в общении

не думаю, что вообще вернусь: матрица — плохой, объективно плохой протокол, но не из-за протокола самого, а из-за коммьюнити, людей, пользовательской базы

Итак, осталось две реализации матрикс-сервера.

#matrix #conduwuit #foss #конец @rf

EN: https://gts.dc09.ru/@darkcat09/statuses/01JRK28S7VPH9X85B9VKA7Z4AV

Public
Rxiv mechanobio

📰 "Data-driven performance optimization of gamma spectrometers with many channels"
arxiv.org/abs/2504.07166 #Physics.Ins-Det #Matrix #Force

arXiv logo
arXiv.orgData-driven performance optimization of gamma spectrometers with many channelsIn gamma spectrometers with variable spectroscopic performance across many channels (e.g., many pixels or voxels), a tradeoff exists between including data from successively worse-performing readout channels and increasing efficiency. Brute-force calculation of the optimal set of included channels is exponentially infeasible as the number of channels grows, and approximate methods are required. In this work, we present a data-driven framework for attempting to find near-optimal sets of included detector channels. The framework leverages non-negative matrix factorization (NMF) to learn the behavior of gamma spectra across the detector, and clusters similarly-performing detector channels together. Performance comparisons are then made between spectra with channel clusters removed, which is more feasible than brute force. The framework is general and can be applied to arbitrary, user-defined performance metrics depending on the application. We apply this framework to optimizing gamma spectra measured by H3D M400 CdZnTe spectrometers, which exhibit variable performance across their crystal volumes. In particular, we show several examples optimizing various performance metrics for uranium and plutonium gamma spectra in nondestructive assay for nuclear safeguards, and explore trends in performance vs.\ parameters such as clustering algorithm type. We also compare the NMF+clustering pipeline to several non-machine-learning algorithms, including several greedy algorithms. Overall, we find that the NMF+clustering pipeline tends to find the best-performing set of detector voxels, significantly improving over the un-optimized spectra, but that a greedy accumulation of spectra segmented by detector depth can in some cases give similar performance improvements in much less computation time.
Public
Rxiv mechanobio

📰 "Assembly, testing, and installation of mPMT photosensor for the Water Cherenkov Test Experiment"
arxiv.org/abs/2504.07216 #Physics.Ins-Det #Mechanical #Matrix

arXiv logo
arXiv.orgAssembly, testing, and installation of mPMT photosensor for the Water Cherenkov Test ExperimentThe multi-Photomultiplier Tube (mPMT) photosensors will be used in the Water Cherenkov Test Experiment (WCTE) to efficiently detect the photons produced in the whole detector. One of the aims behind the development of WCTE is to test the technology and implement it in future water Cherenkov experiments such as the Hyper-Kamiokande experiment and its Intermediate Water Cherenkov Detector. Each mPMT is built using nineteen 3-inch PMTs arranged on a semi-spherical support matrix. In this paper, we describe the design and manufacture of the mechanical components, the procedures for casting an optical gel between PMTs and acrylic cover, and the overall assembly procedure of the mPMTs. We also report on the R&D performed on the selection of the optical gel ratio along with transmittance measurements and the reflectance measurements performed on the aluminium reflector. We also present the optical tests performed on the mPMT module using a 405 nm LED and the resulting increase in the effective photosensitive area by surrounding the PMTs with a reflector. A summary of the production and installation of the mPMTs for the WCTE is also presented in this paper.
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