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/sci/ Science & Math

Threads added between 2014/01/29 16:00 and 2014/01/29 22:00

Cryptography

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Hey guys so I have this cryptography thing to do, was wondering if anyone can give me a hand. A small-time crook wishes to set up an illegal horse racing betting shop online. He intends to do this by setting up an email address and getting his customers to email their bets to him using standard SMTP emails. However, he understands that email per se is not secure and emails may be faked. He decides that all his customers should have pseudonyms and messages should be encrypted using the ADFGVX cipher. Messages will be of the following form: Message 1: Betting BET <DD/MM/YY> <Location> <Time> <Horse> <Amount> <Pseudonym> Once he receives this message he will return a message ACCEPTED <Pseudonym> <DD/MM/YY> <Location> <Time> <Horse> <BET_ID> Message 2: Cancel Bet CANCEL <BET_ID> <Pseudonym> Once he receives this message he will return a message CANCELLED <BET_ID> The task: Assuming that there are different cipher keys for each gambler, critically evaluate this protocol for betting, paying particular attention to the attacks that both law enforcement and other criminals could make on the protocol.

Totally Useless College Majors

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So I always enjoy a good college major pissing contest. We all know STEM is god-tier if we are on /sci/....lets name some really horrible majors itt and explain why they suck I'll go first: ______ Studies This includes gender, racial, and general. It sucks because you spend four years doing something I could've learned in a summer with a library card

Stem Cell Magic

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Why aren't you guys discussing the most significant advancement in the medical field since Penicillin? Scientists have found that it's possible to turn Mouse cells into stem cells by giving them an acid bath, if this also works with human cells we could have much cheaper, completely ethical source of stem cells. http://www.bbc.co.uk/news/health-25917270 http://www.nytimes.com/2014/01/30/business/study-says-new-method-could-be-a-quicker-source-of-stem-cells.html?_r=0
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1/9998 = 0.0001 0002 0004 0008 0016 0032 0064 0128 0256 0512 1024 2048 4096 … WTF? Why???
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Hye guys, quick question. I got into a bit of an argument with my economics professor and I'm looking to get some proof for my point. His statement was that on a PPF model, any point to the left of the curve is considered inefficient, but this does not include the axis. I said that it does, because if you produce 30 million computers in a given year and you have the capability to produce 40 million, you are producing inefficiently. He said I was incorrect because that point would be a point on the curve of a different year, but we were only discussing a single year beforehand. The reason I'm here is because I'd like to have an equation or inequality that shows that the point on the axis (30m) would still be a valid solution (IE would be considered "inside" the curve.) But I'm not sure how to represent this kind of line on a graph. Could one of you show me an inequality that would fit the kind of graph pictured? I thought of x^2+y^2 < 40,000,000 but I need it to be limited to the first quadrant, which I am unsure how to represent mathematically.
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Any fellow Cambridge master-race lurking /sci/? If so, post your college and what your studying. if anyone attends the same college you have to meet - no exceptions.

stuff

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is thee an alternative to khan university that will work on psvita + phone
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>implying science can explain the immense power of the psychedelic >implying multidimensional machine elves are a figment of imagination >implying we're not all dreaming a dream and the world is not made of stories rather than atoms >implying the world makes sense, or we can make sense of it >implying our ego is not blinding us from the real truth which is beyond words >implying we didn't all grow up from a psychedelic trip called being a toddler
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Woke up yesterday and decided I'm really not into this whole "you die, you lose" stuff. Untill that day I would certainly become a physicist, but now I know the only goal in my life is to prevent death. Where I live, I can attend to biomedical science and biomedical engineering. Sentimentalisms apart, tell me the exact fields of study I should look after to fulfill my new dream

Global warming

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How do I explain global warming to people? A bunch of idiots I know think that a cold front disprooves climate change, and I want to know how to explain to them how that's not how it works.
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What /sci/ related things do you do in your free time, if anything, that are productive or gives you useful skills? I mean stuff that you could eventually put on a CV or make money from. Literally the only thing I can think of is learning programming. >be a chemical engineer >recently gave up on the idea of starting either of the below 2 coursera courses since they won't help me on a day to day basis, or probably won't build up to anything https://www.coursera.org/course/compmethods https://www.coursera.org/course/functionalanalysis Is the below course practical? https://www.coursera.org/course/algs4partI
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Can /sci/ help me understand calculus and integrals/derivates/limits?I mean on a more intuitive way...

Doing science

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I reckon I'm not the only one theoretical physicist wannabe planning on acquiring a job in some institute. Provide some kind of review of American/European countries in aspect of the research-job prospects. Specifically I'm interested in the QFT area. Pic hopefully unrelated.
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Halp, /sci/, I'm in despair and need the help of Anonses. In 6 hours I have to asses biology project, in which I have to check whether music affects one's heart beat rate. All u would have to do is to measure your pulse while sitting, and then listen to four songs of different genres (with measuring pulse after each song). Would be awesome if you verified whether you're manon or femanon. Songs: 1) http://www.youtube.com/watch?v=8Qx2lMaMsl8 2) http://www.youtube.com/watch?v=FHp2KgyQUFk 3) http://www.youtube.com/watch?v=ab9176Srb5Y 4) http://www.youtube.com/watch?v=St6ZzLMMVe4 It won't even take 20 minutes of yours, and you will make a /sci/ bro extremely happy (and let him pass this year...) Awaiting your answer, Anon P.S. I already posted this on /b/ (which I think was not the best move) but I thought that /sci/ is more suitable for this
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I need to learn about Fourier series and transformations; recommend me a textbook. I study chem if that's relevant in any way. picture unrelated
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I need a 820 ohm resistor and a 470 ohm resistor. I currently have 10 100ohm resistors and 2 1k resistors. Here is the circuit I am wanting to complete. Would it be ok to substitute the 820 ohm with 8x100ohm in series. And substitute the 470ohm resistor with 2 1k resistors in parallel? This is to write/read data to a PS2 memory card. I have completed circuits here and there in the past but have never substituted different value resistors. Thanks in advance!
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#rexolution animooted

Ever wondered what it's like to actually study physics?

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https://www.youtube.com/watch?v=nVZuIMXsfjA

riddle

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Q: You stand blindfolded in front of a table. you are told that there are 32 cards with the number up and an unknown amount of cards (so it's not sure it's 52) with the number down. Is there a possibility that you can divide the cards in two groups so that both groups have the same amount of cards with the number upwards. Note: there is a chance that the answer is no, but that would be really stupid. It's a question from my gf school for 15 to 16 year olds
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Someone who is good with math Please calculate how many times you can play Napalm Death's "You Suffer" (0:01,3 seconds long) in a thousand years which is the longest song ever called Longplayer Or rather, will be the longest song ever Thanks.
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>Chronic kidney disease globally resulted in 735,000 deaths in 2010 up from 400,000 deaths in 1990 -http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(12)61728-0/fulltext

Planetary say what

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Planetary (and moon) pronunciation questions... How do you say it? Uranus: >yer-ah-niss >your anus Io >eye-oh >EEE-o
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>Apparently 1 in 5 people over the age of 12 have herpes >The fraction is even larger for those who are older >Herpes can be very easily contracted >Can be contracted via oral sex So.... I just shouldn't worry and should use a condom by preference. It seems completely inevitable without abstinence. What is the average perception on this, do people even care?

Discussion

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Hello. I am wondering if anyone here would be up for a debate on empirisism and post rationalization. I know this is alot philosophical but also very important for science in general and without scientists this debate is not possible. I myself finished study in law and plan on starting philosophy now. I think (and also learned) that with scientists you have the highest chance of getting a good debate, because they are more likely to be open minded (atleast the brilliant ones) and mosten calm and resistent to rage (most i've met). Hope this hasn't changed. Also would be interesting if you would include your subject of study (hasnt to be on college, private studies work aswell)
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Hey /sci/ I got a question for you. Im reading a textbook on digital design and Ive ran into a strange boolean equation that has the same output for the function and the complement. The function is W•X + Y•Z and its inverse would be W`+ X` • Y` + Z`. For the input WXYZ = 1110 they both give 1. Whats going on here?

Wings

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hi /sci/ I was watching a video of insect flight in slow motion https://www.youtube.com/watch?v=TfJ-Rinx6-0 and noticed that the wings dont flap up and down but move in a circular pattern so that at the upstroke moment only a small amount of surface area is perpendicular to the ground can this work at a scale to lift one or two people?
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What is known about the mother of our Sun? We only exist because a star before our sun died and paved the way for gas clouds to accumulate and coalesce to form our Sun. I think the system before ours is very underrated.

Geological Engineering

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Is studying geological engineering economically viable? Have any stories of somebody who took it in uni?
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History of maths. I got a project on it and I don't know what to include. I chose modern maths as a subject, so I think Abel and Galois would be nice, but I want your suggestions.






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