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Joined 1 year ago
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Cake day: June 12th, 2023

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  • Sorry, but this is completely wrong.

    Windows has ACLs and they are an important part of Windows administration, and used extensively for managing file permissions.

    Windows has supported ACLs on NTFS since Windows NT & NTFS were released in 1993 (possibly partly influenced by AIX ACLs in the late 80s influenced by VMS ACLs introduced the early 80s).

    ACLs were not introduced to standard POSIX until c.1998, and NFS and Linux filesystems didn’t get them until 2003. In fact, the design of the NFSv4 ACL standard was heavily influenced by the design of NTFS/Windows ACL model – a specific decision by the designers to model it more like NTFS rather than AIX/POSIX.

    Technically, at the filesystem level, exFAT also provides support for ACLs, but I am not sure if any implementation actually makes use of this feature (not even Windows AFAIK, certainly not any desktop version).


  • zero_iq@lemm.eetoLinux@lemmy.mlCircles do not exist
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    10 months ago

    Damn, so what’s the name of the shape that’s a flat donut with an inner and outer circular perimeters? i.e. a filled circle with another smaller radius circular area subtracted from it. Or 2D cross section of a torus seen perpendicularly to the plane that intersects the widest part of the torus. A squished donut, or chubby circle, if you like.


  • zero_iq@lemm.eetoLinux@lemmy.mlCircles do not exist
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    10 months ago

    And many “circles” aren’t circles either, but 2D torus approximations. The edge of a true circle is made of infinitesimally small points so would be invisible when drawn. And even if you consider a filled circle, how could you be sure you aren’t looking at a 1-torus with an infinitessimally small hole? Or an approximation of all the set of all points within a circle?

    Clearly, circles are a scam.


  • Unfortunately, it’s not as simple as that. Theoretically, if everyone was using state-of-the-art designs of fast-breeder reactors, we could have up to 300,000 years of fuel. However, those designs are complicated and extremely expensive to build and operate. The finances just don’t make it viable with current technology; they would have to run at a huge financial loss.

    As for Uranium for sea-water – this too is possible, but has rapidly diminishing returns that make it financially unviable quite rapidly. As Uranium is extracted and removed from the oceans, exponentially more sea-water must be processed to continue extracting Uranium at the same rate. This gets infeasible pretty quickly. Estimates are that it would become economically unviable within 30 years.

    Realistically, with current technology we have about 80-100 years of viable nuclear fuel at current consumption rates. If everyone was using nuclear right now, we would fully deplete all viable uranium reserves in about 5 years. A huge amount of research and development will be required to extend this further, and to make new more efficient reactor designs economically viable. (Or ditch capitalism and do it anyway – good luck with that!)

    Personally, I would rather this investment (or at least a large chunk of it) be spent on renewables, energy storage and distribution, before fusion, with fission nuclear as a stop-gap until other cleaner, safer technologies can take over. (Current energy usage would require running about 15000 reactors globally, and with historical accident rates, that’s about one major nuclear disaster every month). Renewables are simpler, safer, and proven ,and the technology is more-or-less already here. Solving the storage and distribution problem is simpler than building safe and economical fast-breeder reactors, or viable fusion power. We have almost all the technology we need to make this work right now, we mostly just lack infrastructure and the will to do it.

    I’m not anti-nuclear, nor am I saying there’s no place for nuclear, and I think there should be more funding for nuclear research, but the boring obvious solution is to invest heavily in renewables, with nuclear as a backup and/or future option. Maybe one day nuclear will progress to the point where it makes more sound sense to go all in on, say fusion, or super-efficient fast-breeders, etc. but at the moment, it’s basically science fiction. I don’t think it’s a sound strategy to bank on nuclear right now, although we should definitely continue to develop it. Maybe if we had continued investing in it at the same rate for the last 50 years it might be more viable – but we didn’t.

    Source for estimates: “Is Nuclear Power Globally Scalable?”, Prof. D. Abbott, Proceedings of the IEEE. It’s an older article, but nuclear technology has been pretty much stagnant since it was published.



  • In the latest version of the emergency broadcast specification (WEA 3.0), a smart phone’s GPS capabilities (and other location features) may be used to provide “enhanced geotargeting” so precise boundaries can be set for local alerts. However, the system is backwards compatible – if you do not have GPS, you will still receive an alert, but whether it is displayed depends on the accuracy of the location features that are enabled. If the phone determines it is within the target boundary, the alert will be displayed. If the phone determines it is not within the boundary, it will be stored and may be displayed later if you enter the boundary.

    If the phone is unable to geolocate itself, the emergency message will be displayed regardless. (Better to display the alert unnecessarily than to not display it at all).

    The relevant technical standard is WEA. Only the latest WEA 3.0 standard uses phone-based geolocation. Older versions just broadcast from cell towers within the region, and all phones that are connected to the towers will receive and display the alerts. You can read about it in more detail here.


  • Ah, OK. So it seems it’s a case of the spirit of the text not matching the precise technical wording used. IMO, the legislation clearly intends to exclude freely-distributable open-source software, but the issue lies with what constitutes a commercial activity. (I’ve not yet checked the rest of the document to see if it clearly defines “commercial activity” in relation to the legislation.)

    TBH, it seems that what is needed here is a clarification and tightening up of definitions, not wholesale rejection of the legislation.


  • Why is everyone up in arms about this?

    The legislation specifically excludes open source software. Has nobody in this discussion actually read the proposed legislation?

    From the current proposal legislation text:

    In order not to hamper innovation or research, free and open-source software developed or supplied outside the course of a commercial activity should not be covered by this Regulation. This is in particular the case for software, including its source code and modified versions, that is openly shared and freely accessible, usable, modifiable and redistributable.

    There is also a clause that states those using open source software in commercial products must report any vulnerabilities found to the maintainer.