![Statistical analysis of storm-time near](http://s1.studyres.com/store/data/003619252_1-bd41b699f59d4d00ef666a900638a463-300x300.png)
AC loss in superconducting tapes and cables
... Figure 1.2 Critical magnetic fields of a type-II superconducting material versus temperature. The high critical-current density of superconductors permits a large decrease in the volume, weight and cost of devices that have to carry a high current. The absence of resistive energy dissipation greatly ...
... Figure 1.2 Critical magnetic fields of a type-II superconducting material versus temperature. The high critical-current density of superconductors permits a large decrease in the volume, weight and cost of devices that have to carry a high current. The absence of resistive energy dissipation greatly ...
Advanced Concepts of Electromagnetic Generation, Confinement
... impulse combined with continuous thrust. This implies that even though the thrust is orders of magnitude lower than for chemical thrusters, the continuous acceleration gained by a spacecraft propelled by such engines allows accomplishing very ambitious missions, whilst requiring relatively higher tr ...
... impulse combined with continuous thrust. This implies that even though the thrust is orders of magnitude lower than for chemical thrusters, the continuous acceleration gained by a spacecraft propelled by such engines allows accomplishing very ambitious missions, whilst requiring relatively higher tr ...
Lecture Notes 12: Microscopic Theory of Dielectrics, Clausius-Mossotti Eqn, Langevin and DeBye Eqns; Ferro-, Piezo- and Pyro-Electric Materials
... In a gaseous or liquid dielectric, the thermal energy of the medium (due to it being at finite temperature) causes collisions between the molecules, which tend to destroy / randomize any net alignment of the polar molecules with the local field Eloc (i.e. thermal energy / thermal agitation depolariz ...
... In a gaseous or liquid dielectric, the thermal energy of the medium (due to it being at finite temperature) causes collisions between the molecules, which tend to destroy / randomize any net alignment of the polar molecules with the local field Eloc (i.e. thermal energy / thermal agitation depolariz ...
Defining and resolving current systems in geospace
... example, consider the feedback on the electric fields within the magnetosphere–ionosphere system. Of the various currents flowing on or near the magnetopause, the region 1 current system connects to the ionosphere and influences the convection pattern. Similarly, in the inner magnetosphere, only the ...
... example, consider the feedback on the electric fields within the magnetosphere–ionosphere system. Of the various currents flowing on or near the magnetopause, the region 1 current system connects to the ionosphere and influences the convection pattern. Similarly, in the inner magnetosphere, only the ...
testing a generalized domain model of photodegradation and self
... α0 . (a) General geometry for diverging rays incident on the detector, (b) spherical geometry of the angles α0 , α, and ρ. A0 connects the interferometer to center of the detector, with the angle between the optical axis, 0, and A0 being α0 , A connects the interferometer to any point on the detecto ...
... α0 . (a) General geometry for diverging rays incident on the detector, (b) spherical geometry of the angles α0 , α, and ρ. A0 connects the interferometer to center of the detector, with the angle between the optical axis, 0, and A0 being α0 , A connects the interferometer to any point on the detecto ...
ABSTRACT Title of Document:
... in coexisting phases. Therefore, we have investigated the behavior of a PB-b-PEO diblock copolymer of narrow polydispersity (1.04) and roughly equivalent block lengths (54.7 wt% PEO) in the methanol/cyclohexane binary solvent system, which is partially miscible at room temperature and exhibits an am ...
... in coexisting phases. Therefore, we have investigated the behavior of a PB-b-PEO diblock copolymer of narrow polydispersity (1.04) and roughly equivalent block lengths (54.7 wt% PEO) in the methanol/cyclohexane binary solvent system, which is partially miscible at room temperature and exhibits an am ...
Superconductivity
![](https://commons.wikimedia.org/wiki/Special:FilePath/Meissner_effect_p1390048.jpg?width=300)
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.