Archived threads in /sci/ - Science & Math - 646. page
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Correct me if im wrong. A Photon is like a single partical of light.
My question is what shape is is ?
A wave ?
A string ?
A sphere ?
Are particles are assumed to be points
>>7640630
String->Sphere->Wave->Sphere->String
Rinse repeat, though Wave and String are interchangeable then comparable on the bounds of the Fourier transformation
>>7640630
A wave packet
Learn about Fourier Transforms
What does /sci/ think about John B. Calhoun's mouse utopia experiment and how do you think it will reflect on humans?
>>7640541
It's already happening in Tokyo and Sweden
I think that all the people who don't know what John B. Calhoun's mouse utopia experiment actually is about should look it up on google. Because I am just a lonesome retard who cannot imagine that people do not know John B. Calhoun's mouse utopia experiment. After all John B. Calhoun's mouse utopia experiment is so important that it received its own thread on /sci/.
https://www.youtube.com/watch?v=0Z760XNy4VM
This is an idea for a closed-system propulsion device using a theoretical EM-pulse-emitting antenna fixed inside a closed rectangular prism floating in space.
I AM NOT SUGGESTING THAT I THINK THIS WILL WORK.
However, I don't know enough about physics to know why it won't work. I am asking you guys why this won't do what the image shows:
>antenna emits a pulse of energy, system should not move because it causes an equal and opposite force on all sides of the antenna
>pulse hits the...
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>>7640499
I've been thinking something similar actually so i'll give you a bump for answers. Originally i was under the impression that sending this pulse of microwaves or whatever it has to be (some energy) wouldn't cause a force on the box, but if it does why wouldn't this work, along with the EM?
it's already a thing senpai
>>7640525
It would indeed impart a miniscule force. See solar sails.
>>7640530
I can understand why this device shouldn't work given current model of physics. Because the microwave energy is constantly emitted, the force on both sides of the device is constantly the same, if you consider the forces on the inside of the cone part pushing it back in the direction of the small end. My idea is different because the energy comes in one single pulse at a time, which will...
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>2015
>there's still no effective cure to baldness
What the hell is taking so long, /sci/? My hairline is starting to recede and I'm not ready to go bald.
there's a reason why cavemen had more hair and aliens have no hair m8. its evolution getting rid of the excess hair
>>7640501
I don't want to be bald, anon. ;_;
>>7640507
unless your have good looking long hair, being bald is pretty attractive to many females. Just lift some weights and you'll grow to love it.
I just realized that if we lost all of our technology we would have to start over by lighting a fire first.
just think about the process from making a fire to building a space shuttle
amazing
ebin thread
needs more le black science man
ALL of our technology? That includes shit like matches and lighters, anon.
Is this worth publishing? It's the only series for the golden ratio that I've ever seen apart from the Fibbonaci definition and the super obvious Taylor expansion of the square root of five.
>>7640434
I've seen you post this 3 times now. At this point if you don't publish it I will.
>>7640434
ask your math prof
>>7640437
You can't publish it without a proof. Also you spend way too much time on such a shitty board.
>>7640443
I have no math prof, dropout
>>7640437
You know what do publish it, I'm not in the maths loop anymore nor do I want to be. I won't give you the proof because if you can come up with it yourself then you deserve credit irregardless of being second. All I will say is trigonometry, binomial theorem...
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Could one man build a spaceship and fly it into outer space on a one-way trip?
you're retarded for asking this.
Anyway. There's not a single man that can build a spaceship on their own. Even so he couldnt build the rocket to get him to space.
Unless he had a big deal of money and bought stuff/hire people to construct it. Even so.. even if he got to space he d run out of food supply sometime. Or he d go crazy from loneliness before that.
>>7640439
Build yourself a gigantic canon and launch your body into space.
Seed other planets with your sacrifice.
Cluck entire galaxies.
>>7640430
ELON MUSK
Cool trio of vids using Galois Theory to solve an example cubic equation, hope you enjoy:
https://www.youtube.com/watch?v=Sg97_Azxvjo
He also has a playlist deriving the Abel-Ruffini theorem which is great but pretty long.
>>7640421
Pretty cool. Thanks OP.
Really fucking nice.
Thank you for the share, OP.
Watched 10 minutes from the first one already.
Why just a cubic?
Why not a more interesting, say quintic or above, with solvable Galois group?
Every cubic is solvable so I don't see how this is that interesting.
It is kinda interesting, but could have been better.
Is it better to encrypt a entire file as a string. with AES 128bit or to encrypt every line individually??
AES is a block cipher, in the 128-bit case it only takes 16 bytes at a time. To encrypt more than 16 bytes, you might need a way of chaining the blocks together. You can choose not to do that, and equal input blocks will result in equal output blocks (ECB mode), which gives hints about the data . Look at https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation , look for the penguin in ECB mode, that's your problem. You can also decide to XOR each input block with the previous cipher block (CBC mode) before encrypting. You can also keep a counter and think of a number...
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>>7640393
for encrypting I am doing the following
import java.security.Key;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class EncryptDecrypt {
public String EnCrypt(String text, String key)
{
String r = "";
try
{
//Pad Key
byte[] keyB = (key).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
keyB = sha.digest(keyB);
...
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>>7640406
*Note* Ill be feeding files into a single string, than encrypting the single string... I do not plan on doing huge files currently.. so this should work fine.
20 initial Θ-data into the construction of Θ^+/-ell NF-Hodge theaters and he gives you this look
>>7640362
>that guy's face
Gets me every time.
>>7640362
respond with
>“You don’t get to say you’ve proved something if you haven’t explained it. A proof is a social construct. If the community doesn’t understand it, you haven’t done your job.”
>>7640362
in every single picture of him he looks visibly disgusted he has to be around other human beings
I just started to read Basic Mathematics by Serge Lang because I feel that my mathematics foundations are not strong and solid and frequently I get sloppy at reasoning while solving some problem.
This book is terrible. Find something else OP
>>7640386
From what I've read so far it seems pretty good, I'm not sure you know what you are talking about desu
op, start with this for a strong foundation (preferably in order):
-pre-algebra
-algebra
-euclidean geometry
-trigonometry
-logic/model theory
-precal and calculus
plenty of pdf's online
to not get off on a rocky start, search for pdf lecture notes
Is mathematics the purest science?
>>7640282
define pure and then you'll see
physics is the most pure. mathematics is not a science, it's in a category of its own. its just mathematics.
>glorified sudoku puzzle solving for unemployed and developmentally regressed neckbeards
>mental masturbation without basis in reality
NOT SCIENCE
Hi /sci/
/pol/ here.
What is the theoretical feasibility of micro-nuclear reactors? the same principle (pauli's exclusion) applies regardless the amount of U or Pu, eh? even 2 atoms with sufficient energy and angle combined together could trigger a cascading reaction, but they need not be that small. say, the size of the chip on your debit card? or the one in your phone? that size? scientifically possible?
>>7640247
For practical purposes, truly "micro"-nuclear reactors are impossible.
In order for a nuclear fission reactor to work, you have to be able to sustain a chain reaction. That means that every fission event needs to trigger, on average, at least one other fission event. Because the ability of materials to absorb neutrons is limited - neutron radiation is fairly penetrating, especially at the high energies emitted by fission events - this means you need a big enough chunk of uranium or plutonium that...
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>>7640275
The smallest reactors I've ever seen actually designed were for potential spaceflight applications; the smallest was the HOMER-15, a reactor producing 15 kW of thermal output (and 3 kW of electrical) that weighed just 214 kg and was 41 cm in diameter and 2.4 m tall.
A reactor designed for Earth usage could be made smaller, since you can use convection and conduction of heat to cool the reactor more efficiently, instead of having to radiate everything. However, you're not getting it too much smaller...
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I wonder how small you could build a Farnsworth Fusor, but you're not gonna get any energy from that.
Let's see who is smart.
Hint: Pic not related
FBFXD YOBSH TDHSX DKLXD HSVFZ YQFSO ZYRZC ULVVF XXCDC UFSLC OZYFX XDHSV FXFFT XCDPD QBYLT FDKSF ZVUXA DJCDS SHXXZ LYZYC FSVFI CXXHP PFXCU LXQFF YXFFY ZYMZV ZYZCB DKHXF TQLXX BYDCV OFLSU DRCDT LJFAZ SFVCV DYCLV CLOXD YDCVO FLSRU BDHSH XKSZF YAXLS FJFFI ZYPCU ZXCDC UFTXF OMFXA FCLZO FAZYK DLQDH CSLCZ OZYFX ULSAC DDQCL ZYQHC UZPUM LOHFV DHOAO FLACD LSSFX CDKTL EDSCL SPFCX DKYHS FTQFS PZYMF XCZPL CZDYX MZCLO RFSFL VUSFZ VUXAD JCDSL CFLSO ZFXCD IIDSC HYZCB AZXVS FFCFY NHZSZ FXZYK SFYVU LYAHX XFVCD SXDYO BSFNH FXCKH YAXKD...
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"What the fuck did you just fucking say about me, you little bitch? I’ll have you know I graduated top of my class in the Navy Seals, and I’ve been involved in numerous secret raids on Al-Quaeda, and I have over 300 confirmed kills. I am trained in gorilla warfare and I’m the top sniper in the entire US armed forces. You are nothing to me but just another target. I will wipe you the fuck out with precision the likes of which has never been seen before on this Earth, mark my fucking words. You think you can get away with saying that shit to me over the Internet? Think...
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>>7640249
Close but no cigar
>>7640244
Vigenère style, use correlation index shit to find language. Then try to guess key size with smart padding for a starter.
You realize no one INVENTED the goddamn wheel, right? Round flat objects occur everywhere in nature. A wheel is useless without an axle. Someone had to actually INVENT the goddamn axle, that took some actual ingenuity.
>>7640095
You realize no one INVENTED the goddamn axle, right? Long, cylindrical objects occur everywhere in nature. An axle is useless without a wheel. Someone had to actually INVENT the goddamn wheel, that took some actual ingenuity.
>>7640108
I just want you to know that everything you are saying right now is factually wrong.
>>7640108
also, thats not the axle. The axle is the entire assembly, including the hooks on the bottom that attach it to the cylinder.
