Magnetic Trapping Apparatus and Frequency Stabilization of a Ring
... Construction schematics of ceramic rings supporting PZT stack of optical cavity. . . . . . . . . . . . . . . . . . . . . . . . . . . 115 ...
... Construction schematics of ceramic rings supporting PZT stack of optical cavity. . . . . . . . . . . . . . . . . . . . . . . . . . . 115 ...
Direct comparison of experimental and theoretical results on the
... parts of the plasma load impedance, Zp = Rp − iLp , calculated using relation (5). Note that Rp = Ra , as long as vacuum (without plasma) load resistance is neglected in theory. One can see from figure 2 that plasma resistance is not very sensitive to the electron temperature, and thus to the electr ...
... parts of the plasma load impedance, Zp = Rp − iLp , calculated using relation (5). Note that Rp = Ra , as long as vacuum (without plasma) load resistance is neglected in theory. One can see from figure 2 that plasma resistance is not very sensitive to the electron temperature, and thus to the electr ...
Simulations of Magnetic Reversal Properties in Granular Recording
... With increasing demand for high density magnetic recording devices a paradigm shift is required to overcome the super-paramagnetic limit. By using a high anisotropy material, such as L10 FePt, and heat assisted magnetic recording the areal density can be taken well beyond 1 Tbit/in2 . For FePt the g ...
... With increasing demand for high density magnetic recording devices a paradigm shift is required to overcome the super-paramagnetic limit. By using a high anisotropy material, such as L10 FePt, and heat assisted magnetic recording the areal density can be taken well beyond 1 Tbit/in2 . For FePt the g ...
Propriétés structurales et dynamiques des sulfates d`alcalins
... 1.1.5 Quadrupolar Hamiltonian in the laboratory system .................................... 27 1.1.6 The first- and the second-order quadrupolar interactions ............................ 28 1.2 Quadrupolar relaxation in solids ........................................................................ ...
... 1.1.5 Quadrupolar Hamiltonian in the laboratory system .................................... 27 1.1.6 The first- and the second-order quadrupolar interactions ............................ 28 1.2 Quadrupolar relaxation in solids ........................................................................ ...
Superconductivity
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.