The inductive current far exceeds critical current density
of the superconductor, thus causing rapid, within several milliseconds, and uniform transition of the device from zero-resistance to high-resistance state, effectively limiting the fault current to no more than 20% of the nominal current.
The US patent titled 'Enhancing Critical Current Density
of Cuprate Superconductors' reveals a method for improving the critical current density
in superconductors by restricting the movement of Abrikosov (A) vortices, Josephson (J) vortices, or Abrikosov-Josephson (A-J) vortices using the half integer vortices associated with the d-wave symmetry present in the grain boundary.
In comparison to low-temperature superconducting wire, which is already being used for MRI, NMR, linear motorcars and more, high-temperature superconducting wire has a higher critical current density
(size of electric current), lowers costs by using liquid nitrogen for cooling, and reduces susceptibility to the effects of external magnetic fields, so the development of high-temperature superconducting wire is currently being promoted.
The 32 papers consider such topics as possibilities of graphene application in textronic devices, the elucidation of metal diffusion mechanisms in conducting-bridge random access memory using first-principle calculations, doped hafnium oxide as an enabler for ferroelectric field effect transistors, and critical current density
and pinning energy of a partially melted samarium-based superconductor.
Sediqeh Dadras, the faculty member of Alzahra University in Tehran, et al increased the critical current density
of high temperature superconductor YBCO up to 10 times by using CNT.
One major obstacle to this is the degradation of the critical current density
Other topics include thermal transients in MgB2 conductors, theories of peak effect and anomalous Hall effect, doping effects on the superconducting properties of bulk and PIT MgB2, optimizing critical current density
, and microwave response of ceramic samples.
These models allow us to predict the current path through a geometrically complex and non-homogenous system, and to determine what percentage of the heart has reached the critical current density
level for defibrillation," said Lindeman.
Removing the top nickel substrate restores the critical current density
to its original value.
At present, the maximum amount of current per cross-sectional area, or critical current density
, of BSCCO--roughly 70,000 amperes per square centimeter (A/[cm.
Most important for motor coils, though, the material retains 90 percent of its critical current density
under stresses reaching 11,500 psi.
Soon after that, when preliminary test results showed very low critical current density
for some early HTS samples, the other extreme prediction emerged, and the title of a report about high [T.