Recent content by BANG!

Ever heard of Power? BANG!

Superconductivity is not a bandstructure phenomenon. The principle is entirely different. Namely, a net positive attraction between electrons causes a gapped ground state to form. This has been proven to be generally true, and in the case of conventional superconductors, phonons mediate this...

Good point. I expect you meant recrystallized, not still melted. alxm covers this interpretation of the orginal post well so I won't add much, except to say that quite often crystal growers begin by forming a sintered powder then they melt and cool this powder back down so as to get a single...

Well, if it is in a melted form then this is clearly different than the crystalline form. However, at the macroscopic level most crystals are not one big repeating single crystal. Rather, it is made of millions of small microscopic domains of aligned repeating unit cells that are randomly...

As Bluesurge stated "When you push down on a table, the table doesn't move, and its energy stays the same" It is always important to keep in mind that work is a transfer of energy. It does not matter how LONG you push down on the table, if it doesn't move then its energy stays the same. That...

This stumped me until I thought to look on the back of a doritos bag: Maltodextrin Monosodium Glutamate Disodium Phosphate Sodium Caseinate Disodium Inosinate Disodium Guanylate Lactic Acid Artificial Color Natural and Artificial Flavor You could argue that these are not COMMON...

Ha ha, yea I am with you on that one.

Neutron scattering experiments on spin ice systems are now claiming to see monopoles. Though technically I think these are quasiparticle excitations with a monopole charge (but don't quote me on that). There was a paper in Nature Physics not that long ago, you should be able to google it.

You can always jump on the whole "Complexity Theory" bandwagon with Murray Gelman, the creator of Mathematica (I forget his name), et. al. There is a book by M. Mitchel Waldrop on the subject, actually there are a host of books now, but this was one of the first and provides a historical...

The current definition of life (at least the one given to me by a biologist prof. years ago) is one based on the following critereion: 1) Ability to Reproduce 2) Has a metabolism 3) Grows 4) Dies 5) Respiration However, the two problems with this are that fire meets all of the...

At absolute zero the fermi momentum is the highest momentum an electron can have in the system. Most electrons sit below this energy. As you increase the temperature you are able to thermally excite electrons close to the fermi surface to energies above Pf and Ef. The probablity of this...

Since you are attached to the Earth by your feet, this creates a torque that cancels the one you deliver to the wall. However, even if you were not attached by your feet you can consider the following thought experiment. You are floating in outer space, just you and a ball with a rod sticking...

you don't need to now the length or mass of the rope to solve this. Only gravity and the coefficient of friction are needed. To solve you need to set the force of friction equal to the force of gravity. Keep in mind only the portion of the rope on the table will contribute to the force of...

Ignoring turbulent flow this can be treated using Bernoulli's Eqn. and the Continuity Eqn. You can use the following link: http://www.engineeringtoolbox.com/bernouilli-equation-d_183.html to see how they are applied to your specific problem. The main result you need is (e4) from this...

I have a question concerning this. First, when talking about s-wave versus d-wave superconductivity, is this describing the symmetry of the order parameter. Also, some people insist that the "order parameter" is about the symmetry of the gap, while other people refer to it as the symmetry of the...