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Everything posted by Sensei
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Because of screwed up voting system.. 3 mln votes wasted/ignored...
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I want to learn a software that can allow me to be productive
Sensei replied to netopatineto's topic in Computer Science
Very wise move. Then download demo versions of 3D package, 2D gfx software, music software, and try working with them, learning tools until expiration of test period. (Google for: LightWave 3D, Cinema 4D, 3D Studio Max, Maya, Blender (it's free but tragic GUI), Houdini) Then download Visual Studio Express/Community, it's for free to download from Microsoft website f.e.: https://www.microsoft.com/en-us/download/details.aspx?id=48146 (I recommend ISO version, to burn on DVD) Earning and living from it, would be nearly impossible, without fully finished education. And even then quite limited possibilities to get a job IMHO.. Anyone can learn making 3D objects by himself/herself. It is (or could be) more engineering type of job, than art. 3D "artists" do not have to make textures by himself/herself. You can cooperate with the real 2D artist (or photographer), or buy ready packages with them on net. 3D "artists" do not have to render 3D. They can make 3D objects, and sell them online. Additionally experience in 3D modeling will be useful for 3D printing (there is no normal art in it at all). f.e. get catalogue with houses where you have blueprints and photos with ready houses (estate developers/construction companies are giving such catalogues for free here for potential customers) Then scan/photograph blueprint with one of houses, put as backdrop/background image in 3D application, and try recreate their house in 3D package. (YouTube search for "house blueprint 3d" or so, and watch videos) Make 10 such houses from catalogue (it'll be your 3D CV portfolio), and you can get a job in the most of estate construction companies. They need 3D "artists" to make visualizations of buildings they sell. (It's called archviz interior and archviz exterior) Such house portfolio could be also useful to get a job in computer game making IT company. They need people for creating environment where players are walking. No. OpenCL is for programming GPU, processors that you have on gfx card. Okay. I would suggest starting from downloading Visual Studio Community. And try following videos: Simply pause often video (every 10-15 seconds) and repeat what he is doing by yourself in Visual Studio. -
Revolutionary Physics Experiments That Changed The world
Sensei replied to AvneetKaur's topic in Homework Help
7. Cloud Chamber.. It allowed visualization of radioactive decays, cosmic rays, and detection of plentiful of new charged particles, positron, muon, pion, kaon, etc. On this video you can see Rutherford's Gold Foil experiment performed inside of Cloud Chamber. -
Let's consider more realistic scenario. There are lonely stars ejected by f.e. black holes https://en.wikipedia.org/wiki/Intergalactic_star Such star with significant velocity (perhaps even higher than galaxy escape velocity), is flying through our Solar system. If speed of gravity would be higher than speed of light (or instantaneous), we would notice arriving of rogue star (as mangling of planets orbits), prior light from it arrived..
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Oil is not soluble in water, and (typically) has lower density than water, so it gathers on the surface of water. If you would have them in significant amount, you could simply put them to larger container with even more water, and wait (days+) until oil gathers on the surface, and collect it. When there is leakage of fuel from boat, It's surrounded by buoys (with attached to them material to couple cm below surface of water) to disallow oil/fuel to spread and contaminate surrounding water.
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Imagine how would you do it with the Sun: place stick with known length f.e. 1 meter in the flat ground. It'll be casting shadow on the ground. Then every hour, every day of year, record position of tip of shadow on the ground. Do you remember Pythagorean theorem.. ? Length of shadow is line AB, length of stick is line BC, and distance between AC = sqrt(AB^2+BC^2) sin(angle)=BC/AC A is shadow tip point. It's changing position minute by minute, hour by hour, day by day. B is point where stick is put in the ground. Center of the whole "device". Constant. C is top of stick (it's casting shadow). Also constant. Additionally you have yet another angle between B, and A, on the ground. Used by ancients as Sun clock. Stick's method would also work with Moon. For other planets more advanced variation of this method is needed, as they don't emit/reflect a lot of light.
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I found that his Python code fails with f.e. num=30.. My .NET Framework version of it, is showing "30*1=44". after using 64 bit integers I got: 30 * 143165578 = 4294967340 2^32 = 4294967296 4294967340 - 4294967296 = 44... The most significant bit set, is truncated, because of overflow of 32 bit integer.. After using long long everywhere in code ends up in infinite loop (2^64 numbers to check). Divisibility test for 11 is the answer you're searching for? According to https://en.wikipedia.org/wiki/Palindromic_prime "Except for 11, all palindromic primes have an odd number of digits, because the divisibility test for 11 tells us that every palindromic number with an even number of digits is a multiple of 11." https://www.google.com/?#q=palindromic+number+divisible+by+11 Modified version of project. Instead of incrementing k by 1, it increments by 11. Palindrome.zip
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Well, writing my post, I was not thinking about allowing leading zeros at all. But 0 alone is palindrome as well. His code was excluding 0 from palindromes. See the list of numbers on website https://en.wikipedia.org/wiki/Palindromic_number Quote "The first 30 palindromic numbers (in decimal) are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202," If leading zeros would be allowed, there would be also 10 (010), 20 (020), and so on, on the list.. So, isPalindrome() function code, used by OP, should looks like: if ( ( num != 0 ) && ( num % 10 == 0 ) ) : return False; instead of if (num % 10 == 0): return False; to exclude leading zeros, but treating 0 as palindrome. New version of project: Palindrome.zip
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Let's be honest, we don't actually know if particles exist.
Sensei replied to metacogitans's topic in Speculations
Highly accelerated, charged particles, such as electron, positron, proton, muon, pion+-, kaon+-, are leaving traces in Cloud Chamber, and it can be seen by naked eye. It's possible to even see electrons and alpha particles bouncing from other more heavier particles, as f.e. Gold foil like in this experiment (called Gold foil experiment): Whether some particle is stable/unstable, whether it's elementary or composite, is completely different story, and it's exactly under study of quantum physics. -
In the recent years, I am the most annoyed when politician is doing exactly reverse what is good for humankind...
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Absolutely. Not to trashcan, but permanently, because Google and other search bots will find it there, analyze content and find link.. And then in Google/Bing etc. database there will be entry f.e. "domain www.scienceforums.net has link to website http:// earth is flat . com", or whatever is there... Google/other bots are faster than any moderator, in recording new posts and present links in them. And even if mod delete/remove post permanently, search bots already have them in db..
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Detecting Alien Artifacts in the Solar System
Sensei replied to Argent's topic in Evolution, Morphology and Exobiology
Fossil/remain, with DNA/RNA (or alternative), using completely different compounds as building blocks than life on Earth.. During Miller–Urey experiment https://en.wikipedia.org/wiki/Miller–Urey_experiment there has been created amino acids which don't exist naturally on Earth. "This experiment inspired many others. In 1961, Joan Oró found that the nucleotide base adenine could be made from hydrogen cyanide (HCN) and ammonia in a water solution. His experiment produced a large amount of adenine, the molecules of which were formed from 5 molecules of HCN.[15] Also, many amino acids are formed from HCN and ammonia under these conditions.[16] Experiments conducted later showed that the other RNA and DNA nucleobases could be obtained through simulated prebiotic chemistry with a reducing atmosphere.[17]" -
I've been summoned for a roundtable discussion for my municipality.
Sensei replied to Elite Engineer's topic in Politics
I don't recall you ever talking about opiates on forum... So, if you don't know anything, pretending that you know (from forum answers), would be lie.. Or even worser, you could become city expert in the subject.. *) ps. Have you been in Afghanistan, Pakistan, f.e. as soldier on mission, bodyguard, pilot, "tourist", etc.. ? Do you know such people.. ? ps2. You could always read f.e. https://en.wikipedia.org/wiki/Opium_production_in_Afghanistan how to produce, how to process, how to transport, what is compound formula and structure, etc. etc. https://en.wikipedia.org/wiki/Heroin Print them, present and talk for hours.. *) get ball-n-stick enough to build heroin compound model to show.... If you're interested in such job.. -
I am with hypervalent_iodine on this. It's pretty weird question for chemistry lesson, as CO2 is just disallowing access to Oxygen present in air. Doesn't react with fuel nor Oxygen to be able calculate moles (L/mL, or so) of reactant(s) (as there is no reaction). One CO2 molecule could be "reused" multiple times... as long as is needed.. it just blocks access.. Maybe: what is size of flame? Then what is its volume + some tolerance around it? Then calculate number of moles of CO2 inside...
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Get rich on ads from Google, $1 per every +-1000 views, would be my bet. The more catchy/controversial subject, the better for view counter..
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I converted this function from Python to .NET Framework C++, and tried it in my code.. private: System::Boolean isPalindrome( int num ) { if (num % 10 == 0) return false; int r = 0; while (r < num) { r = 10 * r + num % 10; num /= 10; } return (num == r) || (num == r / 10); } And it's returning true for num between 1...9 but it's returning false for num 0. In this article https://en.wikipedia.org/wiki/Palindromic_number the all numbers from 0...9 (decimal) are considered as palindromic numbers I attached entire source code (.NET Framework C++) with compiled .exe Palindrome.zip
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That's pity, in binary system when you multiply [math](2^n+1)*(2^n-1)[/math] You will always end up with the all digits 1, which is binary system palindrome. [math](2^n-1)[/math] is also palindrome.
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You should explicitly specify which numeral system you have in mind, f.e. "examples only in decimal system are allowed". If we have f.e. binary number %11011 it's palindrome in binary system, while the same number but in decimal system, 27, is not anymore.
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Creation, releasing, and advertising of such video, is promotion of stupidity. Resurrection, renaissance of the middle ages..
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Measurement of age of bones and sculls is done using Carbon C-14, with half-life 5730 years, with +- 40 years difference.. If you measure one piece to be 45k, the other one could be 30k, as people move from one place to another in time... They didn't die simultaneously at the same time.. If you die today, 30k years later somebody could find your skull, or somebody else 45k years later could find your skull... Sounds like gibberish since the beginning.. Incomplete skulls still have enough Carbon inside to perform Carbon C-14 radioactive isotope dating to measure when these people died..
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Only imbeciles, will find it entertaining..
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Another question regarding evolution.
Sensei replied to Yossi's topic in Evolution, Morphology and Exobiology
Substantial part of DNA molecule is Carbon. 10^-12 of Carbon is Carbon C-14. Which is unstable isotope and decays via: [math]^{14}_6C \rightarrow ^{14}_7N + e^- + \bar{v}_e + 156.5 keV[/math] with half-life 5730 years +- 40y. If C-14 used to be part of DNA molecule, and decayed to Nitrogen, obviously DNA is damaged. Not severely damaged cell will be able to rebuild. Now, imagine what will happen, if this happens in the middle of cell division.. -
Anti-matter is created in pair production, or decay of unstable particles, unstable isotopes. Anti-matter is created even by your body. Carbon-14 decays to anti-matter anti-neutrino. So the same Potassium-40. If your weight is 80 kg, approximately 2900 decays of C-14, and approximately 10000 decays of P-40 happens per second, in your body. Therefor you're making over 1 billions new anti-matter particles daily.
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Lol. Nonsense. Two eyes are needed to being able to see 3 dimensions. One eye system cannot measure distance. Robots made by human also must have two cameras (if they use visual spectrum of light, not radio waves to detect distance, which simply rely on reflection of photons from environment (different delay t=2d/c) ). Computer analyze point in 1st camera image, and try to find it on 2nd camera image, and use Pythagorean triangle to calculate depth (distance between eyes/cameras is known/constant parameter)