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Revered_Beard

@ Revered_Beard @lemmy.world

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2 yr. ago

  • Researchers discover how to dampen electronic noise in materials with potential for quantum technologies

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  • That would have a tremendous impact on the quality of future microphones. One of the biggest limiters is "self-noise" - like a quiet background of ocean roar when the gain (volume) is raised all the way up, caused by the noise of the circuitry.

  • Pixel 10. Is it possible to force an App notification sound to play via phone speakers while connected to Bluetooth for music?

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  • I'm pretty sure Tasker could handle it. You could probably also limit it to just playing notifications for a single app, or only when connected to one specific BT device, if that's what you're after.

  • New quantum breakthrough could transform teleportation and computing

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  • My understanding is that "the speed of light in a vacuum" isn't really about light itself, but rather about the speed limit of cause and effect, or "information", in our universe. Light just happens to move at that maximum speed.

    In quantum mechanics, even if you can have an entangled pair (separated by long distance) collapse instantaneously, that system still couldn't be used for instantaneous communication that exceeds the speed of light in a vacuum. (At least, that is what I have previously understood.)

    I read all three articles, and didn't find an answer to this question:

    When they say "quantum teleportation of information" - The speed of that teleportation itself is still limited to C, right?

  • Putting HDDs to sleep

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  • Peacock feathers can be lasers

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  • To be clear, it's not that they shoot laser beams from their feathers as some sort of mating ritual or defense mechanism (which, honestly, is probably how I would have used my own laser feathers, if I had them), but that there are strikingly identical nano structures that can reflect back a little bit of laser light, under laboratory conditions:

    After staining the feathers with a common dye and pumping them with soft pulses of light, they used laboratory instruments to detect beams of yellow-green laser light that were too faint to see with the naked eye. They emerged from the feathers’ eyespots, at two distinct wavelengths.

  • The biggest black hole smashup ever detected challenges physics theories

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  • From what I understood of the article, it's not just the size (which you can get from merging previous black holes), but the combination of size, speed, and angle that are raising eyebrows.

    Smash two random black holes together, and the odds are, they're spinning at different random angles. Do that a bunch of times, and unless their angles all happened to be lined up just right, the the resulting spin will be a lot slower than the maximum speed a black hole of that size can spin. But these were spinning at 80% and 90% of their max speed.

    Okay, so maybe they were both "normal sized" black holes that gobbled up a lot of matter around a galactic nucleus? That might work, except then you'd expect them to both be spinning in the same direction - but they weren't.

    So, none of the scientists' predictions are really matching what they actually observed. Maybe it was one of those things, maybe those models are off a bit, or maybe there's another model to explain these kinds of black holes that we just haven't thought of yet.

  • Is there anything like a self-hosted version of medium of substack ?

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  • Video-based AI memory library. Store millions of text chunks in MP4 files with lightning-fast semantic search.

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  • Thank you for taking the time to look into it!

    Um... Yeah.... Using 3 gigs to store 19 megs of text is... suboptimal.

    Maybe something neat will come out of this down the road, but right now it doesn't seem very practical.

  • Video-based AI memory library. Store millions of text chunks in MP4 files with lightning-fast semantic search.

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  • tl;dr - By using this very strange file format, you can functionally have access to the vast power of a vector database, but with the local simplicity of sqlite.

    If I'm understanding this correctly: if you wanted to do a simple search for exact text strings, and that was all that you needed, then yes, you should probably use something like an sqlite database to index and query from.

    However, if you are working with massively large data sets, and you need a vector database (for contextual or semantic searches) - well, that's a next level tier of complexity. At that point, you need a vector database server.

    What this thing does, however, is format your data into what they call "video" (but realistically would probably look like static if you were to actually play it in VLC). Then...

    ... I think it's hooking into some similarities between vector databases and video processing, and then using the mature video processing technology to process the "video" at lightning-fast speeds. And you get all of that contextual power without relying on a cloud-based vector database server.

    (To be clear, I'm doing a lot of hand-waving over the "similarities between vector databases and video processing" here - perhaps somebody with a computer science degree, or an autistic savant, can explain why this works the way that it does.)

  • Biologists Engineer Spiders to Spin Glowing Red Silk

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  • From the research paper:

    a) Comparison of wt and mRFP-modified major ampullate silk fibers rolled on a capillary glass (scale bars: 550 µm).

    b) Strong red fluorescence can also be seen in the major ampullate gland (scale bar: 277 µm).

    c i) The genomic implementation of mRFP into the major ampullate silk was confirmed by amplifying the mRFP DNA sequence extracted from the spider's leg. Only those spiders with red fluorescent silk (scale bar: 138 µm) showed the mRFP sequence-derived signal in the agarose gel.

    C ii) Total-RNA was extracted from the glands, reverse-transcribed, and subjected to R-TqPCR and a melting curve analysis showing a peak at 83°C and 87°C based on a small and a large, amplified fragment.

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  • I think you actually nailed the point perfectly. Part of the social contract is that an employer will provide enough money to meet the basic needs of the employees. When the employer fails to do that, employees can feel like "wage slaves", or prisoners, who are being mistreated.

    "We've had to limit our food anyway," said Valdivia. "So basically you are kind of starving us, Kaiser."

  • The US may be reversing course on child labour | Acute strain on the jobs market has encouraged some states to consider reducing restrictions on employing minors

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  • Rethinking repression − why memory researchers reject the idea of recovered memories of trauma

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  • I think it's more accurate to say that a brain refusing to bring up a certain memory, is what makes it a repressed memory. "Recovering" a repressed memory can happen as part of trauma therapy, or it might happen by itself years later.

    Trauma itself causes incredible changes in the brain, in some very non-intuitive ways. The brain has a number of different strategies for protecting the person, the "self", from unnecessary suffering, and it doesn't let go of those defense mechanisms until "it" feels safe to do so.

    Honestly, out of all of the ways that the brain can respond to trauma, repressed memories is one of the simplest and easiest things to understand.

    The fact that false memories can also be demonstrably created... Well, that muddies the waters a bit, it makes things more complicated to sort through, but it's entirely reasonable to assume that there is a mechanism for memory repression, and there's also a mechanism for creating false memories.

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  • Ooohhh! You know what, I learned something new today! Thank you so much for taking the time to explain it in a way that made sense to me.

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  • What I'm saying is those medical device companies just need to upgrade hardware. Not the user.

    That is a valid perspective, but it doesn't take into account the burden on end users. Would you still feel that same way if you were the user, and the "update" required literal surgery on your body - not because the device failed, or expired, but simply because network standards have changed?

    Because it's the cellphone equivalent of creating a pirate radio station, to put it in terms better understood.

    Why not use the analogy of a Wi-Fi repeater or extender that can handle multiple Wi-Fi standards simultaneously?

    For that matter, it should be rather simple to limit it to only "listen" for connections from known medical devices (though it's not like there are a bunch of 2G phones running around these days).

    I'm listening, but so far, I haven't seen anything that explains why this would actually be a bad idea, or how it could cause any harm.

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  • ...you don't see the advantage in avoiding open heart surgery to replace an embedded medical device?

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  • While I agree with you in principle, that's a hard sell to somebody with an embedded 2G medical device.

    You don't want random companies making cell signal transceivers.

    Setting "companies" aside, I don't see why it couldn't be some sort of DIY project. Like, a small computer with a both a 2G and 5G modem, a set of antennas for each, and some middleware...

    In fact, there are some phones that support both networks... So why couldn't a spare phone be used? They technically already have all the hardware to make it work.

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  • It sounds like there's a really big market opportunity for somebody to make a portable transceiver that converts 2G and 3G signals into 5G...

  • GravyScanner : a FOSS Android app that reveals installed apps involved in Gravy Analytics data breach

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  • Additional info for the lazy: the name of the company is "Gravy Analytics", hence the name "Gravy Scanner" for this app. It's a large data broker, and they don't bother with pesky little details like "informed consent".

    Anyway, they got hacked a month ago, and the hackers threatened to publicly release all the data.

    https://slrpnk.net/post/17048112