fidzu : geek

Concrete accounts for about 8% of the world's greenhouse gas emissions, notes CNN. But a research team at the University of Pennsylvania just used a robotic 3D printer to construct a bridge with "complex, lattice-like patterns" that are just as strong and durable - but with materials that absorb more carbon dioxide. Check out the photos of the "Diamanti" projects "post-tensioned concrete canopy". And CNN's report includes an animated photo showing the 3D printer in action: While most regular concrete absorbs carbon dioxide (up to 30% of its production emissions over its entire life cycle, according to some research), Diamanti's enhanced concrete mixture absorbs 142% more carbon dioxide than conventional concrete mixes. Its first design, a pedestrian bridge, uses 60% less material while retaining mechanical strength, says Masoud Akbarzadeh, an associate professor of architecture at the University of Pennsylvania and director of the lab that spearheaded the project. "Through millions of years of evolution, nature has learned that you don't need material everywhere," says Akbarzadeh. "If you take a cross section of a bone, you realize that bone is quite porous, but there are certain patterns within which the load (or weight) is transferred." By mimicking the structures in certain porous bones - known as triply periodic minimal surface (TPMS) structures - âDiamanti also increased the surface area of the bridge, increasing the concrete mixture's carbon absorption potential by another 30%... According to Akbarzadeh, 3D printing reduces construction time, material, and energy use by 25%, and its structural system reduces the need for steel by 80%, minimizing use of another emissions-heavy material. He added that using the technique with Diamanti's concrete significantly cuts greenhouse gas emissions compared to regular construction techniques, and reduces construction costs by 25% to 30%. "Even without the material innovation, the higher surface itself allows higher CO2 absorption," one engineering lecturer tells CNN. The project was a collaboration with chemical company Sika, funded with grants from the U.S. Energy Department, and is now preparing its first full-size prototype in France. The team has published their findings in the journal Advanced Functional Materials earlier this year.

Read more of this story at Slashdot.

18 Oct 2025 5:34pm GMT

The James Webb Space Telescope gets its highest resolution with the aperture masking interferometer (or AMI), "a tiny piece of precisely machined metal that slots into one of the telescope's cameras," according to a new article by Benjamin Pope, an associated math professor at Macquarie University. "We can finally present its first successful observations of stars, planets, moons and even black hole jets." [AMI] was put on Webb to diagnose and measure any blur in its images. Even nanometres of distortion in Webb's 18 hexagonal primary mirrors and many internal surfaces will blur the images enough to hinder the study of planets or black holes, where sensitivity and resolution are key. AMI filters the light with a carefully structured pattern of holes in a simple metal plate, to make it much easier to tell if there are any optical misalignments. We wanted to use this mode to observe the birth places of planets, as well as material being sucked into black holes. But before any of this, AMI showed Webb wasn't working entirely as hoped. At very fine resolution - at the level of individual pixels - all the images were slightly blurry due to an electronic effect: brighter pixels leaking into their darker neighbours. This is not a mistake or flaw, but a fundamental feature of infrared cameras that turned out to be unexpectedly serious for Webb. This was a dealbreaker for seeing distant planets many thousands of times fainter than their stars a few pixels away: my colleagues quickly showed that its limits were more than ten times worse than hoped. So, we set out to correct it... We built a computer model to simulate AMI's optical physics, with flexibility about the shapes of the mirrors and apertures and about the colours of the stars. We connected this to a machine learning model to represent the electronics with an "effective detector model" - where we only care about how well it can reproduce the data, not about why. After training and validation on some test stars, this setup allowed us to calculate and undo the blur in other data, restoring AMI to full function. It doesn't change what Webb does in space, but rather corrects the data during processing. It worked beautifully - the star HD 206893 hosts a faint planet and the reddest-known brown dwarf (an object between a star and a planet). They were known but out of reach with Webb before applying this correction. Now, both little dots popped out clearly in our new maps of the system... With the new correction, we brought Jupiter's moon Io into focus, clearly tracking its volcanoes as it rotates over an hour-long timelapse. "This correction has opened the door to using AMI to prospect for unknown planets at previously impossible resolutions and sensitivities..." the article points out. "Our results on painstakingly testing and enhancing AMI are now released on the open-access archive arXiv in a pair of papers." Thanks to long-time Slashdot reader schwit1 for sharing the article.

Read more of this story at Slashdot.

18 Oct 2025 4:34pm GMT

Canada's Prime Minister "paused an electric-vehicle sales mandate that was set to take effect next year," reports the Wall Street Journal, which argues a kind of retreat from electric-vehicle ambitions "is spreading around the globe." Even the U.K.'s Prime Minister "has allowed for a more flexible timetable to hit the country's EV targets." And demand is expected to drop in the U.S., where global consulting firm AlixPartners now predicts EVs will make up 18% of new-vehicle sales by 2030 - just half of what they'd predicted two years ago: j U.S. automaker GM will take a $1.6 billion charge "because of sinking EV sales," reports the Wall Street Journal, "a shift it blamed on recent moves by the U.S. government to end EV subsidies and regulatory mandates... That might just be the beginning of a financial reckoning from automakers that poured billions into new electric models - from sports cars and sedans to big pickups and sport-utility vehicles - to try to get ready for the government-backed EV mandates. Automakers have been saying that consumers aren't adopting EVs as quickly as expected, and government efforts to proliferate the technology are hammering their bottom lines. GM, in announcing its charge, said it is reassessing EV capacity and warned that more losses are possible...Carmakers argue the EV business model is an unprofitable proposition given still-high battery costs, spotty car-charging networks and dwindling government subsidies. Incentive programs have ended or have been pared back across Europe and in the U.S. and Canada. Volkswagen, burdened with massive electrification costs, helped spur the reckoning in Europe when it said it would cut 35,000 jobs as part of a deal with its union. The move sent shock waves through the region's political establishment. Weeks later, the EU launched a "strategic dialogue" with the automotive industry that led to a more flexible timetable for automakers to meet its emissions rules for 2025.

Read more of this story at Slashdot.

18 Oct 2025 3:34pm GMT

What if point-and-click games weren't about the puzzles?

18 Oct 2025 12:15pm GMT

But Trump is pressuring the other five.

17 Oct 2025 10:14pm GMT

For bacterial vaginosis, partners are part of the problem-and the solution.

17 Oct 2025 10:02pm GMT

Microsoft has posted a blog post about detailing its latest round of additions to Windows 11, and as will surely not surprise you, it's "AI", all the time, whether you like it or not. I'm not even going to detail most of these "features", as I'm sure most of them will just become yet another series of checkboxes on whatever debloating tool you prefer. Still, there's one recurring theme running throughout Microsoft's recent "AI" marketing that really stands out, and this blog post is no different: Until now, the power of AI has often been gated behind your skill at prompting. The more context you provide and detail you share, the richer response you receive in return. But typing it out can be tedious and time consuming, especially if it takes multiple tries to get it right. With 68% of consumers reporting using AI to support their decision making, voice is making this easier. ↫ Yusuf Mehdi at the Windows Blogs "You're holding it wrong" has become a recurring meme whenever someone places the blame for a shit product on its users, but we're really starting to see this line of thinking explode with "AI" tools now. If you're getting bad, wrong, or downright made up results out of your text generator - which happens all the time - the problem isn't that the text generator is shit; no, the problem is that the user is shit at manipulating and coercing it into generating the right string of words. This is a major problem for "AI" companies, as the obtuseness of input and the inevitable shoddiness of results is most likely putting users off using them, and if there's one thing these companies needs, it's users. All of them are hemorrhaging money without any realistic paths towards profitability, so there's a mad scramble to convince and trick people into using "AI" tools, and every single recent effort by Microsoft regarding Windows and Office is 100% geared towards this goal. That's why nothing is sacred, and everything from Notepad to Paint, from the the Windows Start menu to context menus, from the Explorer file manager to your Windows command line is getting Copilot buttons and sparkly icons: Microsoft has to be able to brag about "AI" user numbers to keep the scam going. As the bubble gets bigger and bigger, and as we come closer and closer to that satisfying pop, you can expect ever more places in Windows to get "AI" features. I can't wait for the sparkle icon to show up when formatting a disk, installing a driver through Device Manager, or during a kernel panic. I can't wait for the blue screen of death to open a Copilot chat that advises you to do something utterly unrelated. You can do it, Microsoft.

17 Oct 2025 9:32pm GMT

This beautiful purple slab is the Silicon Graphics Indigo² (though, unlike its earlier namesake, not actually indigo coloured) with the upper-tier MIPS R10000 CPU and IMPACT graphics. My recollection was that it worked at the time, but I couldn't remember if it booted, and of course that was no guarantee that it could still power on. If this machine is to stay working and in the collection, we're gonna need a Refurb Weekend. ↫ Cameron Kaiser at Old Vintage Computing Research Out of all the retro UNIX workstations of old, the machines from SGI are both the most popular, the most well-known, and thus, also some of the most expensive. Yet, at the same time, everything up until the very last generation or two of MIPS IRIX workstations, generally do not seem to be particularly rare either. The community around SGI's machines and IRIX is also quite thriving still, much more so than the communities of the other commercial UNIX variants. Still, the odds of me completing my collection of final-generation commercial UNIX workstations are low, exactly because of just how rare and stupidly expensive the SGI Tezro is. As always, Cameron Kaiser goes into a level of detail few other people in the world do when it comes to rare or special computers, and this article about the Silicon Graphics Indigo² is no exception. Detailed photographs, an in-depth history of the machine, detailed descriptions of the hardware, the various fixes that needed to be performed, getting it back up and running, and everything else. There's really nobody else writing these kinds of articles. The weekend's here, so sit back, relax, and have fun.

17 Oct 2025 7:57pm GMT

The NLnet foundation has sponsored a project to add WPA3 support to OpenBSD, support which in turn can be used by other operating systems. This project delivers the second open-source implementation of WPA3, the current industry standard for Wi-Fi encryption, specifically for the OpenBSD operating system. Its code can also be integrated by other operating systems to enable modern Wi-Fi encryption, thereby enhancing the diversity and resilience of the global IT ecosystem. ↫ NLnet foundation announcement WPA3 support in Linux seems to be the only other open source implementation of WPA3, so this is great news not only for OpenBSD, but also for other operating systems who rely on BSD network drivers through compatibility layers, like Haiku. FreeBSD, meanwhile, is planning to build its own WPA3 implementation, so they, too, might benefit form the work that's going to be done through OpenBSD. October is listed as the start of this project, so work is probably already underway.

17 Oct 2025 2:17pm GMT

I said when I made the announcement that there wasn't any drama, and there still isn't.

17 Oct 2025 12:00am GMT

rebuilderd v0.25.0 was recently released, this version has improved in-toto support for cryptographic attestations that this blog post briefly outlines. 😺 As a quick recap, rebuilderd is an automatic build scheduler that emerged in 2019/2020 from the Reproducible Builds project doing the following:

1. Track binary packages available in a Linux distribution
2. Attempt to compile the official binary packages from their (alleged) source code
3. Check if the package we compiled is bit-for-bit identical
   1. If so, mark it GOOD, issue an attestation
   2. In every other case, mark it BAD, generate a diffoscope

…

25 Sep 2025 12:00am GMT

We want to provide an update on the recent service outages affecting our infrastructure. The Arch Linux Project is currently experiencing an ongoing denial of service attack that primarily impacts our main webpage, the Arch User Repository (AUR), and the Forums. We are aware of the problems that this creates for our end users and will continue to actively work with our hosting provider to mitigate the attack. We are also evaluating DDoS protection providers while carefully considering factors including cost, security, and ethical standards. To improve the communication around this issue we will provide regular updates on our service …

21 Aug 2025 12:00am GMT