Hackaday Links: August 13, 2023

August 13, 2023 by Dan Maloney 14 Comments

Remember that time when the entire physics community dropped what it was doing to replicate the extraordinary claim that a room-temperature semiconductor had been discovered? We sure do, and if it seems like it was just yesterday, it’s probably because it pretty much was. The news of LK-99, a copper-modified lead apatite compound, hit at the end of July; now, barely three weeks later, comes news that not only is LK-99 not a superconductor, but that its resistivity at room temperature is about a billion times higher than copper. For anyone who rode the “cold fusion” hype train back in the late 1980s, LK-99 had a bit of code smell on it from the start. We figured we’d sit back and let science do what science does, and sure enough, the extraordinary claim seems not to be able to muster the kind of extraordinary evidence it needs to support it — with the significant caveat that a lot of the debunking papers –and indeed the original paper on LK-99 — seem still to be just preprints, and have not been peer-reviewed yet.

So what does all this mean? Sadly, probably not much. Despite the overwrought popular media coverage, a true room-temperature and pressure superconductor was probably not going to save the world, at least not right away. The indispensable Asianometry channel on YouTube did a great video on this. As always, his focus is on the semiconductor industry, so his analysis has to be viewed through that lens. He argues that room-temperature superconductors wouldn’t make much difference in semiconductors because the place where they’d most likely be employed, the interconnects on chips, will still have inductance and capacitance even if their resistance is zero. That doesn’t mean room-temperature superconductors wouldn’t be a great thing to have, of course; seems like they’d be revolutionary for power transmission if nothing else. But not so much for semiconductors, and certainly not today.

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Russian Anti-Satellite Weapon Test Draws Widespread Condemnation

November 17, 2021 by Lewin Day 44 Comments

On the morning of November 15, a Russian missile destroyed a satellite in orbit above Earth. The successful test of the anti-satellite weapon has infuriated many in the space industry, put astronauts and cosmonauts alike at risk, and caught the attention of virtually every public and private space organisation on the planet.

It’s yet another chapter in the controversial history of military anti-satellite operations, and one with important implications for future space missions. Let’s examine what happened, and explore the greater context of the operation.

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How Does A Sail Drone Bring Home Hurricane Footage In Record Time?

October 5, 2021 by Ryan Flowers 11 Comments

It is unlikely that as a young lad [Richard Jenkins] would had have visions of sailing into the eye of a Category-4 hurricane. Yet that’s exactly what he’s done with the Explorer 1045, an uncrewed sailing vehicle built by his company, Saildrone. If that weren’t enough, footage from the vessel enduring greater than 120 MPH (almost 200 km/h) winds and 50 foot (15 M) waves was posted online the very next day, and you can see it below the break. We’re going to take a quick look at just two of the technologies that made this possible: Advanced sails and satellite communication. Both are visible on Explorer 1045’s sibling 1048 as seen below:

Saildrone Explorer 1048, a sibling of Explorer 1045, each one of five vessels equipped with a "hurricane wing" — Saildrone Explorer 1048, a sibling of Explorer 1045, each one of five vessels equipped with a “hurricane wing”

The most prominent feature of course is the lack of a traditional sail. You see, from 1999-2009, [Richard Jenkins] was focused on setting the land world speed record for a wind powered vehicle. He set that record at 126.1 mph by maturing existing sail wing technology. [Richard] did away with conventional rigging and added a boom with a control surface on it, much like the fuselage and empennage of a sailplane.

Instead of adjusting rigging, the control surface could be utilized to fly the wing into its optimal position while using very little energy. [Richard] has been able to apply this technology at his company, Saildrone. The 23 foot Explorer vessel and its big brothers are the result.

How is it that the world was treated to the view from inside the eye of a hurricane only a day after the video was recorded? If you look at the stern of the vessel, you can see a domed white cylinder. It is a satellite communication base station called the Thales VesseLINK. Thales is one of the partner companies that built the satellites for the Iridium NEXT fleet, which has 66 operational satellites in Low Earth Orbit. The Iridium Certus service uses its L-Band (1.6 GHz) signal to provide up to 352 kbps of upload speed and 704 kbps down. While not blazing fast, the service is available anywhere in the world and is reliable because it is not prone to rain fade and other weather based interference.

With just these two recent innovations, the Explorer 1045 was able to sail to the eye of a hurricane, record footage and gather data, and then ship it home just hours later. And we’re hardly exploring the tip of the iceberg. More than just sailboat based cameras, these scientific instruments are designed to survive some of the harshest environments on the planet for over a year at a time. They are a marvel of applied engineering, and we’re positive that there are some brilliant hacks hiding under that bright orange exterior.

If uncrewed sailing vessels float your boat, you might also enjoy this autonomous solar powered tugboat, or that time a submarine ran out of fuel and sailed home on bed sheets.

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Hackaday Links: November 15, 2020

November 15, 2020 by Dan Maloney 13 Comments

Now that we drive around cars that are more like mobile data centers than simple transportation, there’s a wealth of data to be harvested when the inevitable crashes occur. After a recent Tesla crash on a California highway, a security researcher got a hold of the car’s “black box” and extracted some terrifying insights into just how bad a car crash can be. The interesting bit is the view of the crash from the Tesla’s forward-facing cameras with object detection overlays. Putting aside the fact that the driver of this car was accelerating up to the moment it rear-ended the hapless Honda with a closing speed of 63 MPH (101 km/h), the update speeds on the bounding boxes and lane sensing are incredible. The author of the article uses this as an object lesson in why Level 2 self-driving is a bad idea, and while I agree with that premise, the fact that self-driving had been disabled 40 seconds before the driver plowed into the Honda seems to make that argument moot. Tech or not, someone this unskilled or impaired was going to have an accident eventually, and it was just bad luck for the other driver.

Last week I shared a link to Scan the World, an effort to 3D-scan and preserve culturally significant artifacts and create a virtual museum. Shortly after the article ran we got an email from Elisa at Scan the World announcing their “Unlocking Lockdown” competition, which encourages people to scan cultural artifacts and treasures directly from their home. You may not have a Ming Dynasty vase or a Grecian urn on display in your parlor, but you’ve probably got family heirlooms, knick-knacks, and other tchotchkes that should be preserved. Take a look around and scan something for posterity. And I want to thank Elisa for the link to the Pompeiian bread that I mentioned.

The Defense Advanced Research Projects Agency (DARPA)has been running an interesting challenge for the last couple of years: The Subterranean (SubT) Challenge. The goal is to discover new ways to operate autonomously below the surface of the Earth, whether for mining, search and rescue, or warfare applications. They’ve been running different circuits to simulate various underground environments, with the most recent circuit being a cave course back in October. On Tuesday November 17, DARPA will webcast the competition, which features 16 teams and their autonomous search for artifacts in a virtual cave. It could make for interesting viewing.

If underground adventures don’t do it for you, how about going upstairs? LeoLabs, a California-based company that specializes in providing information about satellites, has a fascinating visualization of the planet’s satellite constellation. It’s sort of Google Earth but with the details focused on low-earth orbit. You can fly around the planet and watch the satellites whiz by or even pick out the hundreds of spent upper-stage rockets still up there. You can lock onto a specific satellite, watch for near-misses, or even turn on a layer for space debris, which honestly just turns the display into a purple miasma of orbiting junk. The best bit, though, is the easily discerned samba-lines of newly launched Starlink satellites.

A doorbell used to be a pretty simple device, but like many things, they’ve taken on added complexity. And danger, it appears, as Amazon Ring doorbell users are reporting their new gadgets going up in flame upon installation. The problem stems from installers confusing the screws supplied with the unit. The longer wood screws are intended to mount the device to the wall, while a shorter security screw secures the battery cover. Mix the two up for whatever reason, and the sharp point of the mounting screw can find the LiPo battery within, with predictable results.

And finally, it may be the shittiest of shitty robots: a monstrous robotic wolf intended to scare away wild bears. It seems the Japanese town of Takikawa has been having a problem with bears lately, so they deployed a pair of these improbable looking creatures to protect themselves. It’s hard to say what’s the best feature: the flashing LED eyes, the strobe light tail, the fact that the whole thing floats in the air atop a pole. Whatever it is, it seems to work on bears, which is probably good enough. Take a look in the video below the break.

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