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Endy0816

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Posts posted by Endy0816

  1. Works via a cup with holes drilled on the bottom and a piece of tape acting as a simple valve on the top. If the tape is peeled back water/air can flow, otherwise if kept level the water will happily sit there.

    Partially based on thread here a few weeks ago, wanted to prove to myself that this concept would work in reality(beyond a simple straw or pipette).

    Have some thoughts that it might work for novelty applications(fish tanks, water spheres). A somewhat practical, bottom filling bucket could also be done, but haven't figured out a good valve design to minimize manual operation. Goes without saying applications would need to work around the obvious issue, but nothing strictly impossible to deal with. Water locks, pumps, etc.

    Left: Water filled, Tape in place

    Right: Rapidly draining, Tape peeled back

    20191031_163655.thumb.jpg.01b1d6ea3a7210a58ff35f78ce5c32f3.jpg20191031_164517.thumb.jpg.f65c0bb7783e03eebcc3c72361502d13.jpg

     

    Below: Simple model of what a clean version might look like.

    1495153101_BucketwithHolesv1.png.04692e84c9042388ad19e0742e1a0f61.png

  2. We use hexadecimal and especially sexagesimal regularly too. I actually think kids could really benefit from being better educated on the subject. Base 20 might not be my own first thought, but the different Mayan numerals could definitely aid in grasping the concept.

  3. 6 hours ago, Nedcim said:

    It's not an issue with memory. When the thousandths digit of the denominator is changed from 0 to 1, to approach sin40° the answer changes from the correct approximation of 6.14 to 5.13. 

    Memory can also required as the calculator is trying to solve the problem, though Swansont's suggestion is a good one to check.

  4. Probably due to the fact that the calculator has limited memory to handle an infinitely long repeating decimal with as long a period as 3.93/0.64 has. More memory would help in this case for a more accurate answer, but all calculators have a point where they reach the limits of available memory. Pi is another case where you logically know the number should keep going, but instead it stops and/or is rounded.

     

    3.93/0.641=

    6.131045241809672386895475819032761310452418096723868954758...

    6.13104524180967238689547581903276^_ (period 32)
     
  5. Yeah, it is really both more efficient in a world of digital content delivery and reduces material posessions.

    Evils of materialism aside there are practical problems with being weighed down by stuff. You may only use it once in a blue moon and is entirely possible for it to be lost or destroyed.

  6. Quote

    Since 1967, the second has been defined as exactly "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom" (at a temperature of 0 K). This length of a second was selected to correspond exactly to the length of the ephemeris second previously defined. Atomic clocks use such a frequency to measure seconds by counting cycles per second at that frequency.

    https://en.wikipedia.org/wiki/Second

    I believe it would look something like this in terms of the math.

    1 Hz = 1/s

     9,192,631,770 /  9,192,631,770 Hz = 1 / 1 Hz = 1s

    One of our members Swansont actually works on atomic clocks so hopefully he'll be along in a bit to provide more info and/or any corrections.

     

  7. 2 hours ago, studiot said:

    I couldn't agree more. +1

    Water is a prime example.
    We all to often see pictures of flooding on our UK screens, followed by bleats from the water industry that we are 'running out of water'.

    Yeah, from what I've seen many cities water systems are set up to push water out to sea. Retaining it and/or letting it naturally reach the water table are better routes.

    Think many areas in the UK would be perfect for the large scale underground flood tunnels and reservoirs. Dechannelization and ponds could work too, but underground projects would  probably be easier in terms of public support.

  8. 5 hours ago, MigL said:

    Don't have a problem with self-driving cars.

    As long as Boeing doesn't write the MCAS code for them...

    Definitely a better option than remote in most cases.  Possible that in some cases outsourcing the driving could work in a combined approach though.

    Obtain human input on how to handle an unusual situation, while otherwise remaining on autopilot. Be simpler just to have a person in the car takeover but they could lack a license or the car empty.

  9. 9 hours ago, Ken Fabian said:

    Off topic but ... that is not a story I could recommend to anyone - mostly for it's major inconsistencies between how the peculiar environment is described as working and how it didn't work like that at all within the storyline; eg how many times does (vs should) that "tree" orbit past Goldblatt's world before breaking up? I wanted very much for it to all hang together enough to set aside my disbelief, although clearly he managed with many readers - which is credit to Niven's ability to evoke a sense of wonder, I suppose.

    Partly agree about the trees themselves not making much sense, at least at the size suggested. Thought the adaptations and technologies employed were the most interesting parts.

    Moving towards more prehensile feet, perhaps even tails again, would definitely make sense though.

  10. 11 hours ago, Ken Fabian said:

    It seems to me that whilst feet and toes are not as dexterous or strong as hands they are still capable of gripping and holding - and that would be useful in zero gravity. Those with no choice but rely on feet show how versatile feet and toes can be with practice. Down here on Earth I will use my toes to pick things up off the floor and pass them to my hands when I am barefoot, usually without conscious thought.

    I think not using feet in space is a wasted opportunity. Should astronauts be training to use their feet and toes to maximise their body's versatility?

    They apparently wear socks for warmth and comfort, but if they didn't it could work for everyone with long enough toes. Maybe some kind of foot gloves could be done.

    Read about this idea as a low-G adaptation in scifi, in Integral Trees by Larry Niven. Good read if interested.

  11. 2 hours ago, Strange said:

    With CO2 at about 400 ppm, even a doubling of C02 would have an insignificant change on O2 levels. Even multiplying the CO2 by 10 would change the amount of O2 by less than 1% (looking just at the levels of those gases, ignoring other effects caused by increasing CO2).

    It's the areas that are already low that are the problem.

    La Paz, Bolivia has about 2.7 million living at 13.2% for instance. We can  reasonably expect Chronic Mountain Sickness numbers to climb.

    It's really the same situation as with low lying areas, ideally we keep everything as it has been.

     

  12. 2 hours ago, mistermack said:

    There really is not an issue with oxygen dropping. There is roughly 525 times as much oxygen in the atmosphere as CO2. To double the CO2, you only need to use about 0.2 % of available oxygen. As the current level of oxygen is about 21% there is no prospect at all of problematic levels of oxygen. It really would be the CO2 that was the problem, if that ever happened. 

    That's only outdoors at sea level unfortunately.

    They're normally linked, but even with just CO2 increasing and O2 held constant, you'll see the O2 percentage level drop.

  13. They're required to keep a fraction of their funds with the Federal Reserve, limiting the growth of money.

    It doesn't just appear.*

    Neither money nor debt is necessarily better, but at some point you have to pay the piper black magic or no. **

     

    * Government literally printing money aside.

    ** Sometimes. There's a greater magic called defaulting. In that case someone else is left holding the bag. They are generally not pleased by this.

  14. 12 hours ago, mistermack said:

    Yes of course. The actual surplus oxygen that has built up over millions of years is the result of organics that turned into coal, or oil or gas etc, and was kept away from the microbes that would break them down using up the available oxygen in the cycle. 

    If I remember rightly, there have been times when the oxygen levels were significantly higher, allowing giant insects like enormous dragonflies to exist. 

    But there's just the one involved in producing it. In significant quantities anyway.

    There's an issue in that we need oxygen roughly between 19.5% and 22%. As CO2 levels increase the oxygen percentage will naturally drop.

    More immediate concerns(vanishing land and food disruption), but low oxygen zones are a real possibility down the line.

    If we evolved to X we really need to try and keep things about the same as they were.

  15. 19 hours ago, random_soldier1337 said:

    I do recall a lot of discussion surrounding money. It's been a bit though. I think the issue is not only with crime but general incapability of handling money, especially if someone is in debt. I think it was something along the lines of they would be easy to manipulate because of their life style and how easy it would be to play them for their lust of currency. Just ask them for some private info while offering like a $100,000 and they'll let it all out.

    Not sure about the rest.

    Yeah they check credit history and they probably go more in-depth depending on the clearance level. Anything that can be used to possibly manipulate someone is of concern.

  16. 1 hour ago, random_soldier1337 said:

    From the discussions I have had with friends thus far, it sounds like there is nothing to lose. Can't (presumably) clear the check, can't apply for the job. Apply and let the authorities decide. If you don't get it, the situation remains the same as when you couldn't apply. The problem comes in the fact that if there is or isn't a time limit on someone being able to speak of said crime, assuming they are truthful. Even if they did their time, reformed and it was all at least a decade ago, would there still be some crime that is an obvious automatic blacklist regardless of time and reformations?

    I would think anything money related. Possibly for prostitution related offenses as well.

  17. On 9/10/2019 at 10:08 PM, Trurl said:

    Ok to show I don't just waste my time looking for patterns in factoring. I have also studied game theory. Not so much the rigorous math, but the protocols. With a little knowledge and possible outcomes you can make some good predictions.

    I don't know if my reference will be lost on those who don't follow American football but here it is.

    I predicted on January 10th 2019 that Antonio Brown would become a New England Patriot.

    I have proof in the YouTube video link following. But my simple approach to game theory does not end there. Simply put the Patriots are ruining football. What if we the fans could devise a game plan that would defeat the Patriots. We could use game theory and math. It would be a great challenge.

    As my girlfriend is a big Patriots fan, helping you would result in a negative payoff for myself.

    Seriously now you're talking more about strategizing than Game Theory. Game theory is more along the lines of the Prisoner's Dilemma or outcomes of different simple evolutionary strategies.

     

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