Search found 24 matches

by scienceandreason
Fri Feb 19, 2010 4:46 pm UTC
Forum: Science
Topic: Pick a number between 1 and 100
Replies: 74
Views: 7564

Re: Pick a number between 1 and 100

Possibly. I started doing this as a pseudoscience experiment which is put it in here. However, if the moderator wants to move it i wouldn't object.
by scienceandreason
Wed Feb 17, 2010 6:02 pm UTC
Forum: Science
Topic: Pick a number between 1 and 100
Replies: 74
Views: 7564

Re: Pick a number between 1 and 100

Damn you. But yes, this is kinda what I am going for. My office mate and I have a bet on how the numbers will cluster over the larger range.
by scienceandreason
Wed Feb 17, 2010 5:44 pm UTC
Forum: Science
Topic: Pick a number between 1 and 100
Replies: 74
Views: 7564

Re: Pick a number between 1 and 100

I am worried it will. It's mostly to settle a bet and to waste some of my time.
by scienceandreason
Wed Feb 17, 2010 4:32 pm UTC
Forum: Science
Topic: Pick a number between 1 and 100
Replies: 74
Views: 7564

Pick a number between 1 and 100

Hello everyone. I am procrastinating on school work and want to conduct a small experiment. If you don't mind, please give me an integer between 1 and 100 (1 and 100 are allowed) and post it here so I can tabulate the results. Please come up with it yourself (ie no random number generators like your...
by scienceandreason
Wed Dec 02, 2009 5:32 am UTC
Forum: Science
Topic: Photons: mass or -less?
Replies: 13
Views: 2121

Re: Photons: mass or -less?

^^^
Nothing. The main aspect of BCS theory is an effective attractive electron-electron interaction mediated by the exchange of phonons (quanta of lattice vibrations). This causes the electrons to pair off and form a new ground state.
by scienceandreason
Tue Dec 01, 2009 10:41 pm UTC
Forum: Science
Topic: Photons: mass or -less?
Replies: 13
Views: 2121

Re: Photons: mass or -less?

In the BCS theory of superconductivity, the photon does acquire a mass through spontaneous symmetry breaking (this works the same way as the Higgs mechanism), though I suppose it is debatable whether or not this is what you would usually think of as a mass. Yeah, I don't think you are correct there...
by scienceandreason
Fri Aug 21, 2009 10:40 pm UTC
Forum: Science
Topic: Superconductor
Replies: 3
Views: 913

Re: Superconductor

You can send me a PM on here. I do theoretical work on high-temperature superconducivity.
by scienceandreason
Thu Jul 09, 2009 10:29 pm UTC
Forum: Science
Topic: Does the width of a superconducting wire matter?
Replies: 15
Views: 2911

Re: Does the width of a superconducting wire matter?

Remember that all current in a superconductor runs on the surface, that may intuitively explain why flat ribbons are good. I thought it was because the most useful superconductors are made from brittle ceramics, and it's easier to grow them in layers than to mould them into wires... You are mostly ...
by scienceandreason
Thu Jul 09, 2009 10:27 pm UTC
Forum: Science
Topic: Does the width of a superconducting wire matter?
Replies: 15
Views: 2911

Re: Does the width of a superconducting wire matter?

It's actually a critical current density that matters. Once the wire has a current density beyond it's limit the superconducting state is no longer stable and it will collapse. Therefore, the thicker the wire the more current you can carry for a given supercurrent.
by scienceandreason
Fri Jun 26, 2009 3:13 pm UTC
Forum: Science
Topic: Quantum Physics: Wavefunctions
Replies: 11
Views: 1788

Re: Quantum Physics: Wavefunctions

Wow. Yes, that is wrong.

The modulus square of the wave function is the normalized quantity.
by scienceandreason
Fri May 29, 2009 9:26 pm UTC
Forum: Science
Topic: Insider Science Jokes/Lingo
Replies: 129
Views: 28798

Re: Insider Science Jokes/Lingo

There are two codes used to do computations for nuclear reactors called "Dungeon" and "Dragon".
by scienceandreason
Fri May 29, 2009 9:19 pm UTC
Forum: Science
Topic: The wave-particle nature of light
Replies: 18
Views: 2599

Re: The wave-particle nature of light

Well now I have questions about the particle being in this "non-allowed" region. There is no physical analogue to this is there? If the barrier was made out of matter the particle could just pass through it which I guess would allow the "Spazzy Model" as it could twist and turn ...
by scienceandreason
Fri Apr 24, 2009 7:45 pm UTC
Forum: Science
Topic: Variable force??
Replies: 4
Views: 963

Re: Variable force??

yeah, the
v = a*t + v_0
d = 0.5*at^2 + vt + d_0
equations assume a constant acceleration.
by scienceandreason
Fri Apr 24, 2009 7:34 pm UTC
Forum: Science
Topic: Looking for a particular scientific paper.
Replies: 3
Views: 716

Re: Looking for a particular scientific paper.

If the article has not been accepted for publication you are fine siting the arXiv article. We do it all the time in papers.
by scienceandreason
Fri Apr 24, 2009 7:31 pm UTC
Forum: Science
Topic: Favourite popular science magazine?
Replies: 20
Views: 1720

Re: Favourite popular science magazine?

I am a big fan of Seed magazine but sometimes it's hard to find on the news stands.
by scienceandreason
Sat Oct 04, 2008 11:54 pm UTC
Forum: Science
Topic: To Physics Majors - What did you do after graduating?
Replies: 18
Views: 2928

Re: To Physics Majors - What did you do after graduating?

depends on the institution but it should be pretty easy. of course 90% of the stuff you can do with the 1 degree you can do with the other anyway so don't sweat it, just do what you are interested in. I have to echo this statement. It really depends on what the engineering requirements are for your...
by scienceandreason
Sat Oct 04, 2008 11:52 pm UTC
Forum: Science
Topic: Wanted: People who know QM
Replies: 67
Views: 6482

Re: Wanted: People who know QM

BlackSails wrote:
In my pchem class, uncertainity is "caused" by the fact that the momentum and position operators dont commute, and based on that, you can derive the fact that the std dev of one times the std dev of the other is >= hbar.


This is essentially the same statement from another angle.
by scienceandreason
Sat Oct 04, 2008 3:43 am UTC
Forum: Science
Topic: To Physics Majors - What did you do after graduating?
Replies: 18
Views: 2928

Re: To Physics Majors - What did you do after graduating?

I graduated with an undergraduate degree in engineering physics. After that I went to work for a while as a safety analyst for a small nuclear consulting firm in Ontario helping to develop reactor modeling software. I did that for a while but ultimately decided to go back to school and am presently ...
by scienceandreason
Sat Oct 04, 2008 3:37 am UTC
Forum: Science
Topic: The Most Sciencey-Sounding Word/Phrase You've Heard
Replies: 176
Views: 34627

Re: The Most Sciencey-Sounding Word/Phrase You've Heard

I have always been a fan of "non-trivial collective excitation". My non-science friends all think i am referring to some sort of orgy.
by scienceandreason
Sat Oct 04, 2008 3:35 am UTC
Forum: Science
Topic: Wanted: People who know QM
Replies: 67
Views: 6482

Re: Wanted: People who know QM

Something I want to add. I don't agree with theories that work around the uncertainty principle by claiming it is a byproduct of our uncertainty in initial conditions. It is the necessary consequence of the fact that position and momentum (or time and energy) are conjugate variables related by Fouri...
by scienceandreason
Sat Oct 04, 2008 3:27 am UTC
Forum: Science
Topic: Wanted: People who know QM
Replies: 67
Views: 6482

Re: Wanted: People who know QM

Z, You are quite right, what constitutes a measurement has never really been well defined and this is the precise reason why I take the position I do. You also run into problems when you ask who can make such measurements. For example, can Schrodinger's cat observe himself and eliminate the paradox?...
by scienceandreason
Sat Oct 04, 2008 12:38 am UTC
Forum: Science
Topic: Wanted: People who know QM
Replies: 67
Views: 6482

Re: Wanted: People who know QM

Hi Z, I will try to answer your questions. (1) - What do you think about the fundamental role "measurement" or "observation" has to play in QM as it is usually construed? Isn't that totally wacky? Or do you eventually reach a point where you take stuff like that in stride? I am n...
by scienceandreason
Fri Oct 03, 2008 8:56 pm UTC
Forum: Science
Topic: Large Objects and Spin
Replies: 18
Views: 2422

Re: Large Objects and Spin

Have you ever seen the trick where somebody holds a cup and rotates it, while keeping it facing up? (If not, try it yourself. Hold your arm with the palm up. Begin rotating the palm counterclockwise, as viewed from the top, letting it go under your arm on one rotation and over your shoulder on the ...
by scienceandreason
Fri Oct 03, 2008 8:51 pm UTC
Forum: Science
Topic: Heisenberg Uncertainty Principle (merged threads)
Replies: 35
Views: 5109

Re: Uncertainty Principle

The short answer is no. The particles traveling though the field have an extended wavefunction with an envelope of velocities. As a result, they are deflected by varying amounts with a probability described by their wavefunction. When the electron reaches the detector you are performing a measuremen...

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