@Slereah My gravatar is, for a while. I changed it after the Charlie Hebdo shootings to "Je suis Charlie", and I figured I might as well change it again.
@0celo7 I was in Times Square less than 30 minutes before the failed bombing there in 2010. My aunt was working in a building down the street from the WTC on 9/11. She was covered in dust afterword. Things like this put me on edge.
France-case. It will be war in few years. Here's clearly explained why. youtube.com/watch?v=F-QA2rkpBSY the "table of options" is shown on Part 2 at 5:40-> The Energy or oil is not a problem. Uncontrolled population growth made by idiots is.
@alarge Yes thanks, I have programmed dynamical temperatures from the following protocol, so far it generates a much better set of temperatures than l had previously, I have not yet tried it in the full programme yet, will be testing that on Monday to see if it gives a better overall result :) journals.aps.org/prl/abstract/10.1103/PhysRevLett.101.130603
Here is the MOST IMPORTANT STATEMENT you will ever hear: Things that have to tell you they are the most important thing ever are not the most important things.
@Slereah A much better example of a civil engineer from that era was Michelangelo who was the architect and construction supervisor for significant fortifications (including one in a marsh, built on driven piles) when he wasn't engaged in those pointless painting and sculpting hobbies of his. I'd have tagged da Vinci as an ME. And one stymied by lack of the proper materials and prime movers. Again, when he wasn't puttering around creating artistic masterpieces for the ages.
@Danu Well, the list at the video include also other options. War is just to most probable of them. The other options simply can't be scaled to the needed levels cause there is so much helping hands to prevent the natural selection.
@JokelaTurbine Malthusian catastrophe is hardly a new concept. And it's not like human population grows exponentially either. Plenty of mathematical models for it (mentioning this as this is after all a physics chat room).
@AngusTheMan While not necessarily the wrong way to go, that sounds a bit dangerous. Without knowing anything about your code, it seems like a sign that refactoring is in order.
"Sometimes people say quantum mechanics is all wrong. When the particle arrived from the left, its vertical momentum was zero. And now that it has gone through the slit, its position is known. Both position and momentum seem to be known with arbitrary accuracy. It is quite true that we can receive a particle, and on reception determine what its position is and what its momentum would have had to have been to have gotten there. That is true, but that is not what the uncertainty relation (2.3) refers to. Equation (2.3) refers to the p…
From what I understand, bullying happens when someone is harmed through an online system that puts them in contact with other users, sometimes masking their identities.
From Wikipedia:
Cyberbullying is defined in legal glossaries as
actions that use information and communication tech...
@user685252 Followup question: Can the email system be considered cyberbullying because I can use it to send people anonymous emails telling them they suck?
I can understand that if an astronaut attack an other astronaut inside a spaceship he/she will have to answer to the law of the country which owns the ship but what if the attack happened on the moon?
When international friends hear me talking German, they always think I must be really angry and having an argument with somebody.
What are the phonetical explanations for making the German language sound so harsh or rude?
Everyone needs lasers. Alright, I don't want to interrupt this, but I have a question...
I've been working on a project involving solenoids, and I've been assuming the overall field strength of a solenoid (on the z-axis) is the sum of the fields of each turn in the solenoid. I use python to do this calculation, because it's pretty complex (and I don't know calculus currently). Recently, I revisited the site where I found the equation I've been using, and it seems to suggest a much simpler approach.
My two questions, 1) Would their approach be accurate? (I'd assume so, but I'm not really sure.) and 2) would this question be more appropriate as an actual question on P.SE? I'll link the page if it's appropriate to ask it here.
@CoilKid The exact calculation of a finite solenoid's field along the Z axis isn't too bad, yeah, so a simple approach is fine. Why don't you compare your numerical method to the exact result?
@NeuroFuzzy That's a good idea. I should do that...
@HDE226868 hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html#c2 It's the comment "The current used in the calculation above is the total current, so for a coil of N turns, the current used is Ni where i is the current supplied to the coil."
Seems to imply that I can just use the one calculation with a much higher current.
@CoilKid except instead of $N$ loops you have a "continuum" of loops (an infinite number), which simplifies the algebra a lot. (That's the point of calculus here)
Awesome. Well, nice to know my logic isn't broken.
Anyway, do you know what they meant by the comment "The current used in the calculation above is the total current, so for a coil of N turns, the current used is Ni where i is the current supplied to the coil."?
@CoilKid but instead of $Z$, $Z+1N$, \cdots $Z+kN$, the formula in the linked document adds the field at $Z$ (times an infinitesimal), then at $Z+dx$ (for some really small $dx$), etc. an infinite number of times
@CoilKid So that just means that if you wired up an ammeter outside the solenoid, and it read a current $i$, the number in the formula is $Ni$, where $N$ is the number of turns of the coil.
@CoilKid if $i$ is the reading on the ammeter and you have $K$ coils (different letter), the thing to use in the field of a single loop is just the current $i$.
Alright. I think that answers my question then. To confirm, that's basically "Because you're calculating the field one loop at a time, you need to use the current for a single loop" right?
Any thoughts on the following simple example: There is no algebraic invariant associated to $F(x,y) = ax + by$, by which I mean there is no single-valued function of $(a,b)$ left invariant after applying linear transformations of $(x,y)$ to $F$, however if we restrict to linear transformations using integers there is an 'arithmetical invariant' $G(a,b) = \sum_{m,n} \frac{1}{(am+bn)^k},2<k,(m,n)\neq (0,0)$. This arithmetical invariant to $ax+by$ is what a Weierstrass function is to an elliptic curve.
Water waves also aren't, in general, directionless, just look at the waves rolling towards shores, for instance, so why should EM waves be? — ACuriousMind27 mins ago
They are spreading in all directions, it's just that they're very far from the (idealized) "source point", that's at least how I interpret Huygens' principle
It's supposed to motivate how you set up elliptic curves and modular forms and link to theta functions in a nice way, indicating how you generalize theta functions too, all from this simple idea of an arithmetical invariant
From what I understand, bullying happens when someone is harmed through an online system that puts them in contact with other users, sometimes masking their identities.
From Wikipedia:
Cyberbullying is defined in legal glossaries as
actions that use information and communication tech...
I can understand that if an astronaut attack an other astronaut inside a spaceship he/she will have to answer to the law of the country which owns the ship but what if the attack happened on the moon?
When international friends hear me talking German, they always think I must be really angry and having an argument with somebody.
What are the phonetical explanations for making the German language sound so harsh or rude?
