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Archived threads in /sci/ - Science & Math - 1590. page

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Hi /sci/!

I am using an analytical balance for gravimetric analysis of samples.

At the beginning of the day, I weigh initial weights of my dust collectors, plus a field blank and "weighing scale blank." The "scale blank" is then left sealed beside the analytical balance.

Ideally, the "scale blank" should have no weight difference since it is sealed and equilibrated to the same conditions that the balance is subjected to.

However, when I measure the weight of the "scale blank" after 12 hours during post weighing of the samples, there is usually a weight difference between the initial and post weighing of the "scale blank."

My question is: how does this weight difference affect the post weights of all my samples? Is it reported as a precision issue or do I subtract/add the wight difference of the "scale blank" to the post weights of the samples?

Thanks in advance for your help.
28 posts and 3 images submitted.
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>>8156277
What kind of model do you use?
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>>8156287
It's pic related. Do you need a brand or any more info?
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>>8156296
Nah. Was just wondering if it was a Mettler.

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What's /sci/ think about neuroscience?
13 posts and 1 images submitted.
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>>8156208
Monkey torture kicks ass.
>>
neuroscience

more like

memeroscience

XD
>>
>>8156208
I think it's awesome. I just did brain surgery on a rat.

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What are your opinions on transhumanism /sci/? Are your for or against human animal hybrids?
28 posts and 7 images submitted.
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>>8156153

I support it and I guess I don't have a problem with hybrids
>>
I appreciate the /thread OP.
I'm a pretty memecore transhumanist so I've hopped on the cyborg bandwagon
Never heard about animal hybrid shit, but whatever keeps our consciousness going legitimately fucking do it.
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>>8156156
I'd say it would make our species less lonely in a way. Other intelligent life to fraternize with even if we created them.

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"Infant With Brain Growing Outside His Skull Saved By Pioneering Surgery"
http://gizmodo.com/infant-with-brain-growing-outside-his-skull-saved-by-pi-1782348507

Anyone else getting really pissed when they see something like this? Does ANYONE think about how life for this kid will be like when he grows up? It neither will be normal or good and I'm really tired of society pretending there is nothing worse than death, when it is obvious that euthanizing cases like this would be merciful and generous.
Just when will we overcome this shallow standard of morality we have at the moment? Or will this ever change at all?
Am I just being a dick here? Give me your opinion /sci/
32 posts and 5 images submitted.
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CHECK. YOUR. PRIVILEGE
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>>8156122
What? imagine how much more computational power it will have at it's disposal you small-minded fuck.
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>>8156135
Either way we simply need experiments like this.
And down's syndrome people? Maybe they'll be useful for fucking asteroid mining because of X. You seem to not know that mutation is fucking indispensable part of evolution. GFTO of my /sci/.

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What's the latest scientific or philisophical accomplishment /sci/?
Has a new branch been formed or has something revolutionary been created yet?
23 posts and 8 images submitted.
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As a Biofag, I'd say CRISPR/Cas. That shit has amazing potential. There is an absolute glut of papers getting published that use it.
>>
I proved Riemann hypothesis last Thursday.
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>>8155962
A bit late there.

riemann-hypothesis-unsolved/index.html

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Is this possible or is it a myth?
13 posts and 3 images submitted.
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>>8155890
Cows have 60 chromosomes, which is 4 short of a horse, so this mix will never be viable.

You would have better luck trying to cross a horse with a skunk, or a cow with a goat. The former is unlikely due to the genetic distance between the species, you might get lucky with certain cow/goat hybrids, but they are almost certain to be sterile if they do survive.
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>>8155897
Yeah, but
How come this animal has this weird face?

http://g1.globo.com/bahia/noticia/2016/06/animal-com-corpo-de-bovino-e-cabeca-de-equino-chama-atencao-na-bahia.html?utm_source=facebook&utm_medium=social&utm_campaign=g1
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>>8155900
doesnt look that wierd to me, are you aware of how many bovid subspecies exist on the planet?

Let's have a nice nuclear engineering thread.

Where's the nuclear industry going? Is studying nuclear engineering viable today? How does it compare with other types of engineering, such as electrical and mechanical, in terms of job prospects and reputation?
15 posts and 1 images submitted.
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oh I thought we were actually talking about engineering nuclear plants
>>
So do you want to talk about engineering? Or do you want to talk about college?
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>>8155375
>>8155381
Oh my bad, I didn't know I had to pick one and only one

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TLDR: retard needs help reading mathematically rigorous literature.

Explanation below.

I'm a math major and as awkward as it's going to sound I have difficulty understanding Mathematically rigorous texts/literature. This problem usually arises when reading older texts, as most new texts are a bit watered down and don't propose as many theorems or proofs as older texts do. Or if they do they're written in a clearer manner.

I have a few books on Modern Algebra and I can get through the first few chapters of the books that I own (it's not difficult by any means, I know.), but whenever I try to read a book like Shilov's Linear Algebra I get flustered because of how is written. Not that it's poorly written, I just can't understand it.

Is it supposed to be straightforward to read and understand like 1-3 re-reads or is it supposed to take me multiple (3+) attempts to read a theorem? (Linear Algebra level)

My professor last semester for ODE said it wasn't necessarily our fault, as we had never been expected or forced to learn how to read mathematically rigorous texts.

Do any math majors here have any tips to help me learn how to read mathematically rigorous material?
13 posts and 1 images submitted.
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It's always hard when you're starting out, and it gets better over time
>>
Keep practicing. Or just give up and kill yourself. Who cares
>>
>>8155321
I know the feeling, i had that exact problem as a first year.
ultimately i ended up using wikipedia or just google and basically rewriting all the theorems and proofs in more familiar terms.

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What is electrons? How do you convert them to light? Doesn't this make the flashlight lighter?
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>>8155239
Yeah, pretty much.
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>>8155239
No, they don't weigh less. The electrons flow through the battery, none are "eaten up" by the lightbulb. Energized electrons move into higher energy states. This is called an excited state. It is not stable, and the electrons will eventually move back down to their lowest energy states (except in some cases, such as phosphorescence). This move creates an electromagnetic disturbance we call "light". This light has energy equal to the energy released by the electron moving, which is equal to the energy it took to move the electron to an excited state. This energy comes from the potential difference on either side of the batteries, which causes electrons to move. When they move through a resistant filament in the bulb, they heat up the filament, causing the atoms to become excited. The voltage of the battery is created because of chemicals of opposite charge in each side of the battery. One of these chemicals has free electrons, the other can receive them. In rechargeable batteries, the chemical reaction between the battery fluid and the terminals attached to the wire can be reversed by adding energy to the system.

That's how flashlights work.

tl;dr no mass is displaced because there are the same amount of electrons in the flashlight at any given time, and light has no mass. The energy required to make light was already present in the battery.
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>>8155245
Hey man, he could be serious, give him a break.

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Theoretically speaking could we salvage any cells from Prophet Muhammad's hair and clone him?
33 posts and 2 images submitted.
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>>8154963
What a waste of time. Do we have any of Jesus' hair? Creating a modern baby Jesus would be enough of a sin to start a full-blown religious war. That would be amazing.
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>>8154963
good luck trying to rob his grave
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>>8154976
...
Clone both.
Raise them together.
Ensueing bants would be top tier m8.
Bonus points if you can find buddhas bones too.

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How difficult was ochem /sci/? I got to say after a whole year of organic it didn't really live up to it's reputation. After doing the readings plus lecture it seemed pretty straight forward to me.
25 posts and 2 images submitted.
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shameless bump
>>
>>8154910

It wasn't hard. Only premed biofags complained about it.
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>>8154910
Pretty sure it depends a lot on your school. Some places have super hard gen chem and easy ochem. Other schools it's the other way around.

Only going off of what friends said in undergrad and kids I tutor said later at different schools. I only took gen chem.

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"A car travels the first half of its journey at 60km/h. The driver wants the average speed over the whole trip to be 70km/h. What speed must he travel the second half of the journey at?" Is this solvable. I was given this question but I have no clue how to approach it or if I'm just getting trolled. Its not 80km/h btw..
16 posts and 1 images submitted.
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>>8154872
Trick question.

Before the car can reach the end of the journey it has to travel half the distance, before it reaches half the distance it has to travel half of half the distance and before it reaches that it has to travel half that distance again and so on an infinite number of times.

Hope this helps :^)
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>>8154872
back to high school kiddo. And yes it is solveable
>>
>>8154872
x/70 = x/120 + x/2y
or
1/70 = 1/120 + 1/2y
-1/2y = 1/120 - 1/70
y= 168 km/h

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I want to learn basic string theory. I don't even know what that means and have no understanding of the topic whatsoever, but I want to learn it because it just seems like the epitome of difficulty. I want a hard goal.

Background: I've always found math and science easy. I've mainly been held back by laziness not a lack of intellectual capacity all my life. Recently got a degree in Computer Science and will be working for a "Big 4" (think Google, Microsoft, Facebook, Amazon) making 6 figures but I feel intellectually unsatisfied because I found the degree stupidly easy, and fun not hard. So I guess I'm reasonably smart or non-retarded? Idk

Anyone willing to explain a roadmap on how to learn basic string theory via self study? My highest math is Calc 3, bit disappointed in myself at that but it's all that was required for my CS degree.

Thanks.
34 posts and 6 images submitted.
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I don't even know what bait pic to choose but I guess I'll just have to pick one
>>
Algebra, Geometry, Trig, Calculus (single variable), Calculus (Multivariable), Analytic geometry, Linear Algebra, Ordinary differential equations, Partial differential equations, Real analysis, Complex Analysis, Manifold Analysis, Abstract algebra, Multilinear Algebra, Differential Geometry, Lie groups, Differential forms, Topology, Algebraic topology, Noncommutative geometry and probably more, but that's just to get started.

Good luck, see you in 10 years OP
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>>8154938
As a mathematical physics grad student, I missed the chance to do alg topology and don't have pre req's for algebraic geometry what good intro books exist for these? I have studied all the other things in your list and also have a grounding in qft, qm, electrodynamics, SR basically all main physics groups apart from GR.

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>photons have mass
yes or no?
12 posts and 2 images submitted.
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>>8154727
The whole situation with Hodor is a time travel paradox. It can't happen.
>>
>>8154727
Rest mass, no.
Relativistic mass, yes.
This is almost definition.
>>
>>8154727
>photons have mass
>yes or no?
no.

>>8154739
It follows the self-consistency principle, so it's not a paradox.

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Did have any sort of preference, or was he rather indifferent to the whole concept?
21 posts and 9 images submitted.
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>>8154692
He died before all that bullshit came about.
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>>8154695
The Descent of Man though.
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>>8154692
Darwin's ideas are pretty much irrelevant nowadays.

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