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Source: NYT > U.S.
Republicans had asked the court to strike down restrictions on how much political parties can spend in coordination with candidates.
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Source: The Register
Researchers affiliated with ETH Zurich have devised a multifunction picture element, or pixel, that can both emit and measure light. Traditional pixels generally do one or the other – illuminating a display screen or capturing light in a camera sensor. A team led by David Norris, professor at ETH Zurich's Optical Materials Engineering Laboratory, has found a way to combine the two functions. The research raises the possibility of two-way screens that take and present pictures, holographic displays, optical communication systems, and quantum information processing. As described in the Nature article "Fourier pixels for bidirectional light control," the ETH Zurich boffins developed a technique that involves measuring light wave interference patterns over a metallic surface. By doing so, they're able to generate "Fourier pixels" that can create and detect the amplitude, phase and polarization of optical fields. The Fourier transform is a mathematical technique that takes a function like a sound wave and returns a function representing the specific frequencies present in that sound. A Fourier pixel represents the spatial frequency of light rather than the specific brightness at a given point in an image. "Thanks to the fact that the relevant surface profiles of the pixels can be determined using Fourier analysis, we can combine the control and analysis of amplitude, phase and polarisation on a single pixel," said post-doc Sander Vonk in an ETH Zurich press release. In the near term, Norris expects to put Fourier pixels into a matrix that can be used to construct more sophisticated camera displays. The other authors included Yannik M. Glauser, David B. Seda, Hannah Niese, Boris de Jong, Matthieu F. Bidaut, Daniel Petter, Erwan Bossavit, Gabriel Nagamine, and Nolan Lassaline. ®
I decided it was time for a 3D printer upgrade recently. I did some playing with my old Kossel, adding braces and changing some tuning since it runs Klipper, and while it continues to be a fine machine for small PLA parts, and a fun project, I wanted more volume, more speed, and an enclosure so I can run a wider range of materials.
Instead of doing something reasonable and spending O($500) on one of the various commercial options that meets the “Enclosed, Larger, Faster 3D printer that I can run a wider range of materials on” prompt (the Qidi Q2 was a close contender) I decided I wanted to build a Voron Trident.
I did “some” reading so I had opinions on mods I wanted out of the gate… and ended up buying one of the ‘roided out Siboor Voron Trident “June ’24” 300mm CNC/AWD kits for (once import duties were paid and such) about $1500. That includes their “Booster Pack 1” option, so it has steel backers on Y, aluminum gantry corner braces (this was the feature I cared about – triangles are good), and TMC5160Ts on the X/Y motors, in addition to the kit standard CNC gantry with double-shear mounts and AWD (they nicely include the 2WD idlers as well, but don’t document the belt path using them), 9mm belts, inverted electronics, clickyclack door, fume pack, and (frankly kind of questionable) side booster fan. I thought I was getting a CB2 for the computer, but it came with a Pi CM4 (CM4102032), which I’m pleased about.
I went for Siboor’s kit despite the Trident R2 already being partially announced because I wanted several of the nonstandard features they bundle, and I wanted to be sure I had it while I had time to spend the several-tens-of-hours to build and tune it before I had academic year obligations.
I ordered the kit via Siboor’s Aliexpress storefront May 14, it was delivered June 10, and printing June 20. It’s currently built essentially to kit instructions, and I’m very pleased with the build process and result. Since so much knowledge about these things is disappearing into search-proof proprietary silos (lookin’ at you, Discord), too much detail below.
Continue readingSource: Hacker News
Source: Hacker News
Source: Hacker News
Source: Hacker News
