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Sensei

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Everything posted by Sensei

  1. I just gave the most typical annihilation modes (the highest probability of happening). Theoretically there is even 13 pions plausible (above it, is not possible, because there is not enough mass-energy. [math] 2 m_p / m_{\pi} [/math] )
  2. The image above is incorrect. Proton-antiproton annihilation does not produce two gamma photons. The most typical result of annihilation of proton-antiproton is: [math]p^+ + p^- \rightarrow \pi^+ + \pi^- + \pi^+ + \pi^- + \pi^0[/math] other paths: [math]p^+ + p^- \rightarrow \pi^+ + \pi^- + \pi^0 + \pi^0 + \pi^0[/math] [math]p^+ + p^- \rightarrow \pi^0 + \pi^0 + \pi^0 + \pi^0 + \pi^0[/math] (and dozen more) Later: [math]\pi^0 \rightarrow \gamma + \gamma[/math] [math]\pi^0 \rightarrow \gamma + e^+ + e^- [/math] [math]\pi^+ \rightarrow \mu^+ + v_{\mu}[/math] [math]\pi^- \rightarrow \mu^- + \bar{v}_{\mu}[/math]
  3. While talking with non-native English speaker there is need of reinterpretation (if somebody is knowledgeable in some area) to not have to constantly asking "WTF are you talking about".. It's kinda funny that non-English-native-speaker will communicate with another non-English-native-speaker (especially both Europeans) better using their own "version of English", than with native English-speaker (UK/US)..
  4. I would not say it's literally opposite.. I just think pavel misspelled what he wanted to know in the first place.. I interpreted it as "how much price of share has to grow, that combined costs of buy and sell, paid to broker, sacrifice the whole transaction".. Every broker takes different percent.. and cost depends on whether investor uses Internet web app, custom made app, or call by phone.. Your interpretation of what he wanted to know makes no sense: If it's day-trading with 0.2%.. then there is needed 100% / 0.2% = 500 transactions, either buy/sell. If it's not day-trading with 0.35% per transaction..there is needed 100% / 0.35% = 286 transactions.. What for somebody would like to know it.. ? The more important is after what grow of price of share, investor is even... and can set up stop-loss.. everything above is income.. (-tax in some cases, but that's after sell).
  5. Being "political correct" has (almost) nothing to do with "politics"..... (it would have in nazis country..) It means f.e. you don't insult f.e. "Afroamericans" by calling them "Nigers", "Black" etc. People started to use normal words, which started to be considered as insulting, and after using them in wrong moment, in wrong place, you could be beaten/shot/killed. So new, alternative words for the same, were created, to replace them. It can be repeated over and over again. In couple years "Afroamericans" could also be considered as insulting... (as almost everybody lost mind on this planet) Being "apolitical correct", would suggest you're against political correctness.. Are you against political correctness.. ? Are you supporting using words which started to be insulting to some people (minorities).. ? I would suggest to treat people, like you would like to be treated (am I not repeating myself, again.. ? )
  6. Apparently you're not stock market investor (especially not day-trader)... He was asking how much shares price has to grow up to have return zero from investment, including broker costs.. (after that he can set up stop-loss without any risk of losing money) f.e. if you have day-trading costs 0.2%, 1000 shares, with morning initial price 100.0 per share: 100.0 * 1000 * 1.002 = 100,200.0 You will be even, if it will grow up from initial 100.0 to 100.401 (by 0.401%). 100.401 * 1000 / 1.002 = 100200.599 100200.599 - 100,200.0 = ~ 0.6
  7. If you would take my above advice, google for "scrabble english dictionary download" + "raw text", you would get this: https://raw.githubusercontent.com/jonbcard/scrabble-bot/master/src/dictionary.txt Then you could run it in a loop in script, and open website (using dozen proxy servers) like http://www.wordreference.com/definition/[word] or http://www.dictionary.com/browse/[word] where [word] is single row from dictionary.txt Parse received page to find whether it's noun, verb, etc.
  8. In your model you will have problems explaining beta decay plus (aka "positron emission") in proton-rich isotopes.. https://en.wikipedia.org/wiki/Positron_emission
  9. Google for "scrabble english dictionary download" or so..
  10. Selling or buying shares is the most expensive when investor has to call broker by phone. It can cost even 1-3%, IIRC. It's the cheapest when selling or buying is done through Internet using special website (investor can log in from anywhere) or special application (investor has to bother installing plugin for browser, only some are supported, 3rd option is completely separate trading app). Broker cost is 0.2%-0.35% here. 0.2% is day-trading cost (buy and sell the same day). There is small threshold price ("0.35% but not less than 2", the last time I checked). Beware! It can get tricky if single transaction will be split to hundred or thousands of transactions! Some scum brokers not once used it to steal money from individual investors (bots are putting small amounts 1 to couple shares, hundred of them, in queue, and somebody who wants to sell/buy but has such "scum broker" won't be able to do transaction, because everything will be wiped out by broker costs). Price depends on broker/stock market (broker pays stock market little percent of what investor paid them). Imagine shares are for 100, and you want to buy 1000. It's 100,000.0. Total cost is 100,000.0 * 1.0035 = 100,350.0 (for 0.35%) or 100,000.0 * 1.002 = 100,200.0 (for 0.2%) If you will buy shares at morning, and it will grow up by 1%, and sell the same day: 100,000.0 * 1.002 = 100,200.0 (morning total cost) 100 * 1.01 = 101 per share 101 * 1000 = 101,000.0 / 1.002 = 100,798.4 (evening total received back) 100,798.4 - 100,200.0 = 598.4 total earned during day of day-trading.
  11. If you wanted serious discussion about subject, you should answer questions like Strange wrote above..
  12. Electrons can be ejected from atom (ionization), or they can absorb energy and jump to higher energy level than ground state.
  13. You can see particles decays, unstable isotopes decays, by your naked eyes, in Cloud Chamber.. Like this: Strong force theory, and weak force theory, are trying to explain why they're stable, and why sometimes they're unstable.. to just explain what you can see in the above video..
  14. It's described on Wikipedia page about Irene Curie.. https://en.wikipedia.org/wiki/Irène_Joliot-Curie Basically each stable isotope (and unstable too) have "missing mass-energy" (aka "binding energy"). After supplying it from external source (in Irene Curie experiment it's alpha particle with enough kinetic energy) nucleus has enough mass-energy, and can decay to smaller or bigger elements/isotopes.
  15. Free neutron has half-life approximately 10 minutes, and mean-life 15 minutes. That's pretty long in the modern quantum physics standards. Free neutrons are made all the time from regular matter.. You can do it at home. Irene Curie got Nobel prize for this.
  16. Do you disagree with some quantum theory? Did you see Cloud Chamber? This is how quantum physicists were/are analyzing quantum particles.. you can see traces leaved by quantum particles on your own eyes..
  17. There was no AI in your idea since the beginning..
  18. Fred, you should check your implementation of algorithm with literally 2, 3 words.. to be sure algorithm has no errors introduced during writing.. Then on 4, then on 5, then further.. Manually check output in text editor. Your implementation looks slightly different than #2 post in the link that you provided. ps. You should not hardcode path to file, instead take it from command-line as argument. If it's not specified, use hardcoded path (if you have to).
  19. OMG, your computer knowledge is near zero... If each of them is unsigned byte what will be range.. ? 0 ... 2^8-1 = 0....255 0.0.0.0 .... 255.255.255.255 (NOT 256.256.256.256 !) How about starting from reading Wikipedia pages about IP v4 addresses for example.. ? You will learn which IP addresses must be skipped because they have special meaning.. Scanning the all IP v4 from the start is silly idea. It's ~4.3 billions IPs. Visiting one per second would take 136 years.. The majority of them contain no servers nor computers, so you will be just wasting time. One IP can be hundred or thousands of computers. Connecting to port 80,443,8080 won't give you much. Virtual servers are configured typically that they REQUIRE host name to reveal their content.. (Did you ever configure Virtual Server in Apache? https://httpd.apache.org/docs/current/vhosts/examples.html ) You should start from collecting host names.. That's why web crawlers are analyzing web pages, to find A HREF HTML tags.. Google made special technique for web admins for revealing what are pages that should be visited or not visited by their bot. But it can be used to examine what are pages hosted on server, if you will pretend Google bot.. If you ever set up website with optimization for Google, using their panel, it should be there in instructions how to optimize and how to fight with 404 errors..
  20. Imagine you have metallic sphere with photo sensors around it from inside of sphere. Suck the all air from it, to have pretty good vacuum. Then use electron gun, and some source of positrons (electron's antiparticle). Electron will annihilate with positron, in the center of sphere, creating two gamma photons. These two photons will be detected by two photo sensors . First detection on one side of sphere, second detection exactly on the opposite side of sphere.
  21. People don't born with final levels of testosterone, estrogen or other sex steroids. They're produced during lifetime by f.e. gonad. Malfunction/mutation of gonad cells could result in misproduction of sex steroids. Reading wikipedia pages about sex steroids should help understanding how they work: https://en.wikipedia.org/wiki/Estradiol https://en.wikipedia.org/wiki/Estetrol https://en.wikipedia.org/wiki/Estriol https://en.wikipedia.org/wiki/Estrone https://en.wikipedia.org/wiki/Progesterone https://en.wikipedia.org/wiki/Androstenediol https://en.wikipedia.org/wiki/Androstenedione https://en.wikipedia.org/wiki/Dehydroepiandrosterone https://en.wikipedia.org/wiki/Dihydrotestosterone https://en.wikipedia.org/wiki/Testosterone https://en.wikipedia.org/wiki/Progestogen https://en.wikipedia.org/wiki/Androgen
  22. Sensei

    Light and qm

    Atom (nucleus + electrons) is normally in ground state. When other particle hits it (photon, electron, proton, alpha etc.), atom's electrons are absorbing part or the all energy of incoming particle, we say atom is in excited state. After a while excited atom, releases energy in form of photons, and goes back to ground state. Photon is emitted. https://en.wikipedia.org/wiki/Ground_state https://en.wikipedia.org/wiki/Excited_state When there is enough energy to ionize atom, electron is ejected. In photoelectric effect incoming particle is photon, and electron (called photoelectron) is ejected. Photon disappears (it's absorbed). Kinetic energy of free electron corresponds to energy of incoming photon minus energy needed to eject it (Work function). https://en.wikipedia.org/wiki/Photoelectric_effect Different elements have slightly different energies of ionization, for each electron. Ionization energies of the elements, per electron (shell/sub-shell): https://en.wikipedia.org/wiki/Ionization_energies_of_the_elements_(data_page) (the table is not final)
  23. Can you translate it to English, please? Do you meant that you have twin brother/sister who is not sharing your political views? Twin brother/sister means that you have (or had, at the beginning) the same (or similar) DNA, because you were made from the same cell.. After separation of organisms, DNA could mutate differently in separated organisms.. WTF, it has anything to do with politics.. ??
  24. I could not believe my own eyes... ps. "How To Piss Me Off" v2.0.. ps2. Ignore this crap..
  25. I am not asking questions, rather teaching you.. and providing reference materials so you can learn even more by your self.. If you don't even bother reading reference materials, I am just wasting my time.. (what a surprise on this planet!)
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