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Few days remaining to our DjangoCon US 2025 Hackathon

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Few days remaining to our DjangoCon US 2025 Hackathon

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  • anarchiversitario@poliversity.itundefined

    I.A. BASTA!

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    anarchiversitario@poliversity.itundefined
    I.A. BASTA! Appello dei docenti contro l’Intelligenza Artificiale “centralizzata” nelle scuole@anarchia Riprendiamo da http://terraeliberta.noblogs.org Rilanciamo questo notevole appello della neonata rete di docenti “I.A. Basta!”. In fondo aggiungiamo una nostra nota critica. Da https://iabasta.ghost.io/primo-appello/ Primo appello alle comunità
  • cybersecurity@poliverso.orgundefined

    Step into my Particle Accelerator

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    cybersecurity@poliverso.orgundefined
    Step into my Particle AcceleratorIf you get a chance to visit a computer history museum and see some of the very old computers, you’ll think they took up a full room. But if you ask, you’ll often find that the power supply was in another room and the cooling system was in yet another. So when you get a computer that fit on, say, a large desk and maybe have a few tape drives all together in a normal-sized office, people thought of it as “small.” We’re seeing a similar evolution in particle accelerators, which, a new startup company says, can be room-sized according to a post by [Charles Q. Choi] over at IEEE Spectrum.Usually, when you think of a particle accelerator, you think of a giant housing like the 3.2-kilometer-long SLAC accelerator. That’s because these machines use magnets to accelerate the particles, and just like a car needs a certain distance to get to a particular speed, you have to have room for the particle to accelerate to the desired velocity.A relatively new technique, though, doesn’t use magnets. Instead, very powerful (but very short) laser pulses create plasma from gas. The plasma oscillates in the wake of the laser, accelerating electrons to relativistic speeds. These so-called wakefield accelerators can, in theory, produce very high-energy electrons and don’t need much space to do it.The startup company, TAU Systems, is about to roll out a commercial system that can generate 60 to 100 MeV at 100 Hz. They also intend to increase the output over time. For reference, SLAC generates 50,000 MeV. But, then again, it takes two miles of raceway to do it.The initial market is likely to be radiation testing for space electronics. Higher energies will open the door to next-generation X-ray lithography for IC production, and more. There are likely applications for accelerated electrons that we don’t see today because it isn’t feasible to generate them without a massive facility.On the other hand, don’t get your checkbook out yet. The units will cost about $10 million at the bottom end. Still a bargain compared to the alternatives.You can do some of this now on a chip. Particle accelerators have come a long way.Photo from Tau Systems.hackaday.com/2025/12/11/step-i…
  • cybersecurity@poliverso.orgundefined

    Designing a Simpler Cycloidal Drive

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    cybersecurity@poliverso.orgundefined
    Designing a Simpler Cycloidal DriveCycloidal drives have an entrancing motion, as well as a few other advantages – high torque and efficiency, low backlash, and compactness among them. However, much as [Sergei Mishin] likes them, it can be difficult to 3D-print high-torque drives, and it’s sometimes inconvenient to have the input and output shafts in-line. When, therefore, he came across a video of an industrial three-ring reducing drive, which works on a similar principle, he naturally designed his own 3D-printable drive.The main issue with 3D-printing a normal cycloidal drive is with the eccentrically-mounted cycloidal plate, since the pins which run through its holes need bearings to keep them from quickly wearing out the plastic plate at high torque. This puts some unfortunate constraints on the size of the drive. A three-ring drive also uses an eccentric drive shaft to cause cycloidal plates to oscillate around a set of pins, but the input and output shafts are offset so that the plates encompass both the pins and the eccentric driveshaft. This simplifies construction significantly, and also makes it possible to add more than one input or output shaft.As the name indicates, these drives use three plates 120 degrees out of phase with each other; [Sergei] tried a design with only two plates 180 degrees out of phase, but since there was a point at which the plates could rotate just as easily in either direction, it jammed easily. Unlike standard cycloidal gears, these plates use epicycloidal rather than hypocycloidal profiles, since they move around the outside of the pins. [Sergei] helpfully wrote a Python script that can generate profiles, animate them, and export to DXF. The final performance of these drives will depend on their design parameters and printing material, but [Sergei] tested a 20:1 drive and reached a respectable 9.8 Newton-meters before it started skipping.Even without this design’s advantages, it’s still possible to 3D-print a cycloidal drive, its cousin the harmonic drive, or even more exotic drive configurations.youtube.com/embed/WMgny-yDjvs?…hackaday.com/2025/12/11/design…
  • francina1909@mastodon.unoundefined

    Quante bugie ci autoraccontiamo ogni giorno, per sopravvivere.

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    teoguitar@mastodon.unoundefined
    @francina1909 ma la domanda corretta è?Perché ci facciamo mille menate quando la nostra esistenza è una briciola nell'universo ?Fra 10-20-30 anni non ci saremo più, fra 100 non saremo nemmeno ricordati, quindi godiamo del ora e adesso, siamo troppo piccoli per avere un impatto, pure minimo, su qualsiasi cosa. Tutto quello che ci fa stare bene è buono, quello che ci sta fare male è male, a prescindere.Il resto serve solo ad ingrassare le tasche dei psicoanalisti...