DrDu's latest activity
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DDrDu replied to the thread Some finds of fossil Devonian fungus "Prototaxites".In case there is still anybody interested in this kind of Prototaxites fossils. There is a renowned shop in Germany, Krantz , who sell...
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DDrDu replied to the thread Molecular-level explanation of macroscopic phenomena: dissolving.Try to have a closer look at sugar crystals. They are anything but cubic!
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.I think that a wealth of this kind of experiments has been performed and published as the understanding of the breakdown of...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.I had a look at your draft. In steady state, there will be an influx of Cooper pairs into the non-SC chamber and a reflux of electrons...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.The pairs are in a condensate and the whole condensate has to be accelerated. The acceleration of the condensate is due to the electric...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.This is a thermodynamical argument, not an argument about violation of conservation of momentum. So I think we can agree on that there...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.This is a thermodynamical argument, not an argument about violation of conservation of momentum. So I think we can agree on that there...
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DDrDu replied to the thread Undergrad Instantaneous dipole moment and orbitals.When talking about London forces, you always need at least two atoms. Their dipole dipole interaction involves the product of the dipole...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.The collision of the normal conducting electrons with the lattice preserves (angular) momentum. It is first carried by the electrons...
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DDrDu replied to the thread Graduate Stability of persistent currents in superconductors regardless of temperature.Of course the normal conducting electrons will slow down due to collisions with the lattice atoms. Normal resistivity. Where is the...