[ home / board list / faq / random / create / bans / search / manage / irc ] [ ]

/sci/ - Science and Mathematics

Spending thousands of dollars on useless labs since 2014.

Catalog

8chan Bitcoin address: 1NpQaXqmCBji6gfX8UgaQEmEstvVY7U32C
The next generation of Infinity is here (discussion) (contribute)
Name
Email
Subject
Comment *
File
* = required field[▶ Show post options & limits]
Confused? See the FAQ.
Embed
(replaces files and can be used instead)
Options
dicesidesmodifier
Password (For file and post deletion.)

Allowed file types:jpg, jpeg, gif, png, webm, mp4, swf, pdf
Max filesize is 8 MB.
Max image dimensions are 10000 x 10000.
You may upload 5 per post.

Oh, hey. We're actually having old posts pruned now.

File: 1426380336998.jpg (31.35 KB, 250x250, 1:1, bigstock--D-Pi-Symbol-1043….jpg)

 No.1965[Reply]

Today is 3/14/15. Let's do something special today. Something like… uh, eating pie!
3 posts omitted. Click reply to view.

 No.1998

File: 1426972794234.png (4.54 KB, 173x225, 173:225, Tau_blog.png)

fuck pi, this isn't halfchan

 No.2229

>>1966

Engineer here, we just round it up to 4.


 No.2235

>>2229

I personally prefer rounding down to 3.


 No.2288

>τ

>http://tauday.com


 No.2292

>>2229

That doesn't make any sense, pretty sure it's bait



File: 1431200701195.jpg (114.48 KB, 605x1023, 55:93, 605px-Accipiter_striatusDO….JPG)

 No.2284[Reply]

How would things be different if Humans had 1 million photoreceptor cells like hawks did instead of the 200,000 that we actually have?

 No.2285

They wouldn't be any different. Humans can see far enough into a distance to do the sort of hunting that they need to. Birds of prey need more acute vision because of flight.



File: 1430763218193.gif (815.17 KB, 167x167, 1:1, maining archer.gif)

 No.2244[Reply]

help /sci/. i'm too partial on the idea of being a significant contributer to science and math, but i can't decide if i want to focus on applications in technology, or to focus on theoretical frameworks that would lead to applications in the distant future.

what do i do? i am heavily inspired by the likes of dirac,fermi,planck, einstein, newton, and so forth, but others that have made advancements by applying themselves, like alan turing, have also motivated me. from this, i can't decide on engineering or theoretical physics/athematics as an undergraduate program.

 No.2281

>>2244

Well depending on what you do there can be some overlap.

There are some scientists and engineers that have a both a theoretical and technical aspect to them depending on what you do.

Industry scientists make small theoretical advancements while working with engineers to solve technical problems, so a PhD physicist or chemist would probably have a mix of both , depending on your field of study. Assuming that you aren't fine with choosing all technical or all theoretical.


 No.2282

File: 1431130576635.gif (394.72 KB, 1260x809, 1260:809, 1428792836181.gif)

>>2281

i see. i like that notion. i think that learning the implementations of nonlinear partial differential equations would be a key thing of my studies, so perhaps i would try to do various papers on the matter while seeking both an analytical and numerical method for generalizing them in a rigorous fashion. i say this because of the poincaire conjecture that was proven was done with nonlinear PDE, but also due to the fact that a stoachistic version of it was also devised.

out of all of the progenitors of modern science and math, von neumman is my favorite for his ability to be influentail in three major mathematical frameowrks, in operator, ergodic, and quantum, all while tailoring them for implementations of the other. and still he found a way to attatch himself in nuclear engineering via lenses.

i'll look into doing gradwork in both physics and math. is this viable if i were to a double major in math and physics initially?



File: 1430525965343.pdf (168.36 KB, Mercury Madre De Dios.pdf)

 No.2203[Reply]

'''The levels of total mercury in hair was significantly (a = 0.05)

higher in mining zones, than Puerto Maldonado. In both areas men had significantly higher levels than women, likely due to

a difference in metabolism or varying levels of direct involvement in gold mining- a male predominated industry. This is the

first study to show the health threat that mercury poses to this region, however further research needs to be done to gain a

more refined understanding of the predominant routes of exposure in this population.'''

Just thought it would be fun to share studies about mercury. Considering it's kind of related to vaccinations I guess.

 No.2207

>>2203

>mining zones

mercury is involved in mining , this shouldn't be surprising.

> vaccinations

There's more mercury in a can of tuna than there is for a vaccine.

The important thing is the dosage. Sure you can revive medical conditions from eating enough fish but you'd have to eat it every day.

http://link.springer.com/article/10.1007/s00401-002-0571-3#page-1

Even if you get a flu shot , the amount of mercury you get is measured in micorgrams.

http://www.fda.gov/BiologicsBloodVaccines/SafetyAvailability/VaccineSafety/UCM096228#tox

>3 mg/kg to several hundred mg/kg

You have to have at least hundreds or thousands of times the ammount in the same timescale for you to start to see the effects of poisoning.

For a corollary, you're not going to die by having 24 shots vodka equally distributed over a year. But if you have them all in a few hours you'll have a one way trip to the morgue.


 No.2274

they say its a preservative

real perservatives are honey salt oil

preservative in the mirror is roughly evilaversy if you nix the top of the p, 666

people who used to breath the stuff during gold purification "went mad as a hatter", known since greece and rome or before…

its actually a super conductor, and could create new paths by connecting two non connected parts of the brain, and would create short circuits if touching two nerves (the nerve signal would never arrive at the destination point b/c of a literal short circuit, it would arrive at a different spot in the brain)… oh well you cant have an opera without a conductor, nor a phantom of the opera without some mirrors

cats the got too much mercury in japan went bat shit crazy and wouldnt stop "dancing" / spazzing, creating a new disease called "dancing cat disease" or "minamata disease"

https://www.youtube.com/watch?v=ihFkyPv1jtU

fwiw how to get rich in 2015: slap some poison shit in a box and sell it, moonsanta gmo, cigarettes, whatever

all the creators of agent orange, sweet n low, aspertame, whatever are hella rich

probably the thorns in jesus crown

i have more but ill stop i guess, its either a possession weapon or an anti possession weapon, im not sure

http://boards.4chan.org/sci/thread/7243416



File: 1430948641297.jpg (182.43 KB, 1280x982, 640:491, 1428399568915.jpg)

 No.2267[Reply]

http://www.integrityresearchinstitute.org/ZPEnergy/ZPEToolkit.htm

, an aim of this study is to provide a clear understanding of the basic principles of the only

known candidate for a limitless, fueless source of power: zero-point energy. Another purpose is to look

at the feasibility of various energy conversion methods that are realistically available to modern

engineering, including emerging nanotechnology, for the possible use of zero-point energy.

anybody willing to extrapolate the information of this article? this sounds like nonsense given the conservation of energy.


File: 1412843470525.jpg (112.42 KB, 800x595, 160:119, image.jpg)

 No.286[Reply]

So I was watching some of the Black Science Man Cosmos episodes, and there's something weird I can't figure out:

In Herschel's discovery of infrared light, why did the infrared thermometer become hotter than the ones in the visible part of the spectrum, when visible light from the sun has higher intensity (pic related)?

Also dumb science questions general, I suppose.
5 posts and 1 image reply omitted. Click reply to view.

 No.1727

>>1722
>>1725
I will be checking out this here:

http://stattrek.com/descriptive-statistics/variables.aspx?tutorial=ap

It seems like it is a good place to start.

 No.1744

File: 1424400880922.png (309.68 KB, 994x583, 994:583, Screenshots_2015-02-20-02-….png)

>>1722
>>1722
Make a triangle and take a ratio ?

 No.1765

>>1722
I'm sorry but I'm not sure what the fuck you're on about. But maybe integration would be helpful here.

 No.1774

>>1722
Least squares method?

 No.2230

How did the Nature know how to put T, H and C together and make the plant? There's like a billion combinations of those letters but she chose that? How does that work



File: 1422547684421.jpg (256.71 KB, 1280x1714, 640:857, Bloodhound.jpg)

 No.1497[Reply]

http://www.imeche.org/news/institution/bloodhound-urgently-needs-best-engineering-minds?hq_e=el&hq_m=686785&hq_l=4&hq_v=0420a9d527


>Ron Ayers MBE, Chief of Aerodynamics on Bloodhound SSC, needs Institution members’ expertise to help find the best solution to measure the velocity of the supersonic car.

>As Chief Aerodynamicist on Bloodhound SSC, Ron outlines some of the challenges of measuring velocity on the car. He is calling on engineers who have specialist knowledge in this field to put forward their suggestions to the team.

>“On most cars, determining the velocity of the vehicle is carried out simply by measuring the wheel rotation. At high velocities, this is not possible for Bloodhound. At velocities above about 600 mph the shockwaves and vibration fluidise the desert so there is no solid surface for the wheels to grip, and experience with Thrust SSC showed that they under-speed by some 5% to 10%.

Can you solve their problem?
7 posts omitted. Click reply to view.

 No.1508

>>1506

Because they need to lock on and track the car at 1000mph (1 mile in 3.6 seconds). They could ask the military for some tracking equipment but they're probably not allowed.

Lasers have errors at 60mph at distances that aren't several miles away.


>unrelated
http://home.bt.com/lifestyle/motoring/motoring-features/spectacular-land-speed-record-test-pits-car-against-plane-at-650mph-11363957952871#article_video

 No.1516

>>1502
>>1503
>>1504
I think doppler is the way to go. A broadcasting tower in-line with the run at either the start or end would do the job nicely. Broadcast a steady frequency and record what the car receives.

 No.1741

>>1497

My name is on the fin of that thing I donated ages and ages ago.

 No.1742

>>1516

Curvature of earth says no

 No.2223

>>1742

What? How so?

I don't think the curvature of the earth would affect a doppler shift.



File: 1430442981221.jpg (37.14 KB, 289x256, 289:256, 06_00_76.jpg)

 No.2192[Reply]

what equation does the graph of the systems of equations solve?

x2 − 2x + 3 = 2x2 − 4x − 3

x2 − 2x + 3 = 2x2 − 4x + 3

−x2 + 2x + 3 = x2 − 4x + 3

−x2 − 2x + 3 = x2 − 4x + 3

 No.2209

-x^2 + 2x +3 = x^2 -4x +3


 No.2211

>>2192

you're telling me that you couldn't plug in 3 and 0 into those equations and see if they're 0 and 3 on both sides?


 No.2214

>>2211

I'm 16 and I just started taking Algebra II

I'm actually good at math and it's one of my best subjects, I just didn't feel like doing any work yesterday, and I still don't, and I didn't bother to learn any of the concepts for our online test


 No.2215

>>2211

but ty for explaining it to me


 No.2216

>>2215

>>2214

>started taking algebra II

Okay that makes sense.

Hopefully your algebra II teacher is more competent than mine was.



File: 1422457104936.png (302.2 KB, 363x321, 121:107, 1382543483165.png)

 No.1491[Reply]

What are the most pointless scientific studies?

 No.1492

File: 1422492238904.jpg (23.08 KB, 460x288, 115:72, penguin_1487813c.jpg)

Large prime numbers, fucking assholes devoting enormous super computers to finding a large prime number for no fucking reason at all. No it is not of any use to encryption either shut your face. Basically scientists with no purpose have fooled the government and many universities to sinking tens of millions of dollars into what amounts to an enormous project to check their dubs.

That being said even useless knowledge tends to become useful at some point in the future. Who knows.

 No.2197

It is like Fallen London. All junk is treasure, in the future



File: 1429365098642.jpg (78.27 KB, 1589x500, 1589:500, 1402002862229.jpg)

 No.2125[Reply]

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

Something interesting happens in this video, instead of the gas tube being the point of failure on this ar15 what happens instead is that the barrel becomes warped and bursts from the stress of continuous fire.

I have a hypothesis as to why this happened but I'm not sure about the math required to investigate it

In short, my guess is that the ratio between the gas tube's surface area and its volume means that while it heats up faster it also cools faster when compared to the barrel and so due to the pauses when the shooter reloads the gas tube is allowed to cool while the heat in the barrel cannot dissipate as quickly, thus the thermal stresses eventually build up faster in the barrel.

Anyone able to help me out in testing this hypothesis?

 No.2158

r u gonna shoot me for the test


 No.2196

the barrel material is a good variable for the test, also ammunition.



 No.2195[Reply]

if im lying between between a piece of metal and an electromagnet

what happens to my cells? is this entanglement? no? what is it?


File: 1428887639711.jpg (8.75 KB, 175x215, 35:43, Gilbert_Ling_(Younger).jpg)

 No.2091[Reply]

The membrane-pump model has been scientifically disproven over 50 years ago. Why do so many biologists still use it? Dr. Gilbert Ling's association-induction hypothesis is an alternative grand unified theory of cell physiology without any metaphysical pumps or lipid layers. Dr. Raymond Damadian adopted the AI hypothesis and used it to invent MRI. Even more real innovation could happen if scientists stopped clinging to this dogma.

I've posted something like this several times, and I have yet to get a convincing response. 90% of the responses are:
>You're so stupid
>Go read a book
>You must be a troll

Occasionally someone actually provides an intelligent response, but I have yet to see one that was convincing. People have claimed that freeze fracturing and osmium tetroxide prove the existence of the lipid membrane, but I researched each and found that neither of them do.

It just seems like the lipid membrane was suggested, then everyone just assumed it was true and never bothered to verify it. Now everything is interpreted in that context. Meanwhile, evidence that appears to contradict the lipid membrane model (like Gilbert Ling's entire life's work) is just ignored.

Responses like "There are literally thousands of published articles that deal with this subject" don't really prove anything. 100 years ago, you could have said the same thing about the luminiferous ether, which turned out to be false.
1 post and 1 image reply omitted. Click reply to view.

 No.2095

>>2094
For over a century, people have suggested that cells are enclosed in an oily membrane, because there are higher or lower concentrations of many water-soluble substances inside cells, than in the blood, lymph, and other extracellular fluids, and the idea of a membrane was invoked (W. Pfeffer, 1877; E. Overton, 1895, 1902) to explain how that difference can persist. (By 1904, the idea of a membrane largely made of lecithin was made ludicrous by A. Nathansohn's observation that water-soaked lecithin loses its oily property, and becomes very hydrophilic; the membrane was supposed to exclude water-soluble molecules while admitting oil-soluble molecules.)

Inside the cell membrane, the cell substance was seen as a watery solution. Biochemistry, as a profession, was strongly based on the assumption that, when a tissue is ground up in water, the dilute extract closely reflects the conditions that existed in the living cell. Around 1970, when I tried to talk to biochemists about ways to study the chemistry of cells that would more closely reflected the living state, a typical response was that the idea was ridiculous, because it questioned the existence of biochemistry itself as a meaningful science.. But since then, there has been a progressive recognition that organization is more important in the life of a cell than had been recognized by traditional biochemistry. Still, many biochemists thoughtlessly identify the chemistry of the living cell with their study of the water-soluble enzymes, and relegate the insoluble residue of the cell to "membrane-associated proteins" or, less traditionally, to "structural proteins." It has been several decades since the structural/contractile protein of muscle was found to be an enzyme, an ATPase, but the idea that the cell itself is a sort of watery solution, in which the water-soluble enzymes float, randomly mingling with dissolved salts, sugars, etc., persists, and makes the idea of a semipermeable membrane seem necessary, to separate a "watery internal phase" from the watery external phase. Physical chemists have no trouble with the fact that a moist protein can absorb oil as well as water, and the concept that even water-soluble enzymes have oil-loving interiors is well established. If that physical-chemical information had existed in Overton's time, there would have been no urge to postulate an oily membrane around cellPost too long. Click here to view the full text.

 No.2181

bump


 No.2182

>90% of the responses are:

>have their commitments:

Maybe if you didn't just copy paste unholy walls of text people would actually listen to you.

I'm not going to read a wall of text copy pasta from yet another niggerfaggot who thinks he's smart by doing so.


 No.2183

>>2181

>bumping in /sci/

>>2095

and?


 No.2193

What exactly are you trying to say? That the lipid bilayer literally does not exist? Then what keeps the cytoplasm from just leaking out?

Are you trying to say that the boundary is protein, and oil just happens to be attracted to it? How does that matter? Why does trypsin not lyse cells?

What about labeling the membrane with oily dyes and doing microscopy? What about cell fusion?

I like the idea of disproving such a central concept but you have to propose some alternative explanation first.



 No.2115[Reply]

/sci/ what is it with evolution? I'm studying law so I'm no expert at all. But is man a descendant of apes? I've read articles a plenty about humans sharing a common ancestor with apes some sort of proto-hominid (not sure if that's how it's spelt), and were neanderthals human or "protohumans"?.
pic unrelated

 No.2116

I forgot to add pic, but I've got nothing on the subject

 No.2120

Evolution is simply the change in frequency of alleles in a population (population being a group of organisms that are the same species) over generations. There are many mechanisms in which evolution can occur, such as natural slection, genetic drift, gene flow, etc.

>Is man a descendant of apes
No, but man does share a common ancestor with modern day apes before separate populations of said common ancestors evolved into different species entirely.

Neanderthals belong to the Genus Homo and are very close to us (0.12% DNA difference), but most consider them to be barely a different species. Fun fact, all modern day humans with the exception of the Southern half of Africa have 1-4% Neanderthal DNA due to breeding between them and early migrating humans.

 No.2123

http://en.wikipedia.org/wiki/Ape#Historical_and_modern_terminology

Humans are apes. No doubt about it.

Evolution is a process through which certain genes become more prevalent in a population. If the population is separated from other populations of the same species in some way, the differences between genetic content of the populations builds up over time until it becomes impossible to have fertile offspring with members of the different population. At that point, the separation between the populations is permanent and there is no natural way for them to recombine into one, and the populations are declared different species. These species can split again, and again, and again, but never grow back into one.

This means that, if you map out these populations in time and genetic distance, the result looks like a tree: branches break off, but never come back together.

This means that the most convenient way to classify groups is by the last common ancestor (population). Having that last common ancestor as your ancestor is a *sufficient* criterion for making a clear consistent group in any animal tree of life.

Humans have a common ancestor. Apes have a common ancestor. The common ancestor of humans has the common ancestor of apes as an ancestor. Therefore humans are a subgroup of apes.

The human common ancestor also has the common ancestor of primates, mammals, tetrapods, vertebrates, chordates, and animals as an ancestor, and therefore humans belong to each of those groups.

 No.2137

>>2115

It's worth noting that humans have killed off all of the closest species on the evolutionary tree; the more similar the species, the more likely we are to compete.

Also some close species were assimilated through interbreeding, which is why we have Neanderthal DNA. The pure Neanderthals were wiped out however.

Humans are also special since we have a great ability to rapidly spread around the world, which is why we are so similar world wide.


 No.2170

>>2120 op here, what about Australoid peoples do they not have Neanderthal blood? would miscegenation thwart human races from becoming different species?



File: 1426547464304.jpg (483.44 KB, 883x541, 883:541, Env Science.jpg)

 No.1977[Reply]

So, I'm studying environmental & Analytical science.

How fucked am I when I graduate?
Any countries I could feasibly find a decent job?

 No.1978

File: 1426554711844.jpg (37.18 KB, 471x251, 471:251, barrier.jpg)

I don't know, m8.

I did however once got a task to measure the environmental acoustics of a certain location, so I guess there's job for you. Then again, I'm living in a minorities country.

 No.2166

>>1977

I was studying what you were, then half-way through decided to drop it and just finish with an associate's degree, as my prospects would be the same. My colleagues were all deluded fools thinking they could stop global warming or save the dolphins, top kek. Sorry we both fell for the same trick, m80.



File: 1429985153697.jpg (290.45 KB, 840x556, 210:139, hwk sticky.jpg)

 No.2153[Reply]

Hey /sci/. I hate to advertise but I created a new board with an emphasis for people to post their homework problems and get help and to receive advice

>>/hwk/

I was hoping to include another sticky with links to helpful sites and to make the board grow. If you're willing to >do it for free and help some people out of boredom or interest, then come by the board. I hope to start a community where everyone can help each other with their studies.

 No.2154

>>2153

>>>/hwk/

Shit, the link was wrong


 No.2160

>>2154

/sci/mod here, and while I don't particularly enjoy shilling, I figured that this board might be a decent addition to the rules so any homeworkfags (which there actually haven't been many, probably because this thing's dead) go there instead. Y/N?


 No.2165

>>2160

Yes. You can link the board on sci's sticky if you want.



Delete Post [ ]
[]
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]
| Catalog
[ home / board list / faq / random / create / bans / search / manage / irc ] [ ]