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fiveworlds

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Posts posted by fiveworlds

  1. A cone creates constructive interference by concentrating the sound waves in a smaller area. In the opposite direction the sound waves are forced to follow a specific direction and cause constructive interference in one direction only.

  2. Applied courses teach through real world learning. You could for instance be an apprentice electrician/chef etc and learn through on the job learning etc. Normal courses are more theoretical. Whichever is best is really what suits you everybody is different. I like learning stuff on my own so a research masters would probably suit me.

  3. Subsaharan Africa is about the size of Europe and North America however it had less than a tenth of the population up until the 1950s. Also here we measure wealth by how much land you have therefore I consider subsaharan african as extremely wealthy.

  4. It seems easy to me that we can make use of quantum entanglement for broadcast however is it possible to make use of quantum entanglement for multicast?? Lets say that we could use the broadcast for dns how would dns tell the computer how to entangle with the server?? It is basically entangling particles at a distance so do the particles we entangle have to be right beside each other when we entangle them??

  5. How would you change windows explorer so that you can have a file in two different locations without the file being copied?

     

    You can use symbolic links, hard links, junctions and libraries. For a single file you would use a hard link which basically makes the computer think the file exists at a specific path but it actually exists elsewhere (it even works with different hard drives). You probably won't need to use it properly but basically you may only add so much to environment variables so programmers add symbolic links to system32 to have access to all their build tools.

  6. Emailed Cv should be PDF so people can open the file easily on their phone.

    Printed CV should be Black and White so that it is cheap for you to print.

     

    What is most relevant to you now should be first if that is education put that first. If you have been working for the past ten years then your work is the most relevant. Tailor the CV for the job you are applying for if you are applying for a job as a chef they don't need to know you worked in a hospital and vice versa.

     

    Emailed Cv - color is OK but there should be a black and white print version for the employer to print if they want.

  7. I've thought at times about learning French (which I had two years of in high school but didn't retain enough of to do me any real good) or German,​

     

     

    I had six years of french and german in high school and I can still barely speak the basics despite having gone to France and Germany and I'm always watching subtitled japanese anime and I can't speak japanese at all.

  8. Hypothetically speaking, if you could replace all division operations on large numbers with a multiplication operation on the same numbers instead, while assuming it achieved the same goals of course. What factor increase in efficiency do you think we would gain?

     

    None the fastest way is called the Sieve of Eratosthenes it involves using an array. It still involves trial division but less off it. First you add two to an array. Then you work through your array testing divisibility. If you get to the end of your array then the number is prime and is pushed to the end of the array. This is a parralelisable operation for instance you can test for the divisibility of all numbers in an array up to the computer resources you have available and then the runtime becomes a polynomial multiple of the resources you have. There is the problem that after a certain point the primes take too much hard drive space so the Sieve of Eratosthenes won't work anymore and you are back to using trial division. The Sieve of Eratosthenes can be used to show that Primes are in P on a turing machine (theoretical computer with infinite resources) P=NP but most computers don't have infinite resources. If you just use multiplication the range of numbers you can possibly calculate on a normal computer decreases by a lot because you are even more limited by hard drive space. There is also a limit on using trial division which is basically if something takes longer than 20 years to calculate your computer will break. There is also the idea that today's limitations may not be limitations in the future new methods of data storage could become available which make just using the sieve the more viable option.

  9. I don't understand what you mean, can you clarify?

    It has been happening slowly over time but we have only now detected it.

     

     

     

    Looking into space is an enormous amount of data. We can't process all the data we make I will assume aliens can but the change has been small changes over the course of years to be noticed they would literally have to be looking for us like we noticed that weird star and are looking at it all the time otherwise AI algorithms probably won't pick up on the small changes or will attribute it to natural phenomena. How do they distinguish between our atmosphere getting hit by rocks when they are not looking and a man-made change.

  10. Ok, but what it sounds like you're talking about developing is "the internet." I don't yet see how it brings something that's not already there.

     

     

    That is basically it only all open source scientific data isn't on the internet really. The problem with it is the sheer scale of the data. Astronomers alone make exabytes of data a day that could be shared so anybody could access them. However global internet traffic worldwide is only 90 - 100 exabytes a month just putting the data from the square kilometer telescope https://en.wikipedia.org/wiki/Square_Kilometre_Array online and making it so anybody could access the data would involve being able to transfer 10 times the current global internet traffic.

  11. Nothing is impossible my friend xD

     

     

    A petabyte retails at about $500,000 a single exabyte would cost over a thousand times that amount. Plus cabling, staff, electricity costs etc. Maybe if you had 2 or 3 trillion dollars. I never said it was impossible I could get it done for an insane amount of money.

     

    It would be much easier to make something like wikipedia and get rid of duplicate data. But that takes either an unbelievable amount of staff or the expectation that users will correct mistakes themselves.

     

    It seems like an enormous amount of hard drives but all data should be stored in triplicate and even if you only had 1 data center for every 3 countries you would only be working with about 40 petabytes after you factor in the space the os etc will take. To put it in perspective the US library of congress has more than 10 petabytes of data alone.

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