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... between point-like behaving elementary particles is just as fundamental as the invariant inverse square law of distance of electrostatic interaction between these same particles, it seemed appropriate to define such an experiment to irrefutably confirm the physical reality of this fundamental law. I ...
... between point-like behaving elementary particles is just as fundamental as the invariant inverse square law of distance of electrostatic interaction between these same particles, it seemed appropriate to define such an experiment to irrefutably confirm the physical reality of this fundamental law. I ...
Diapositive 1
... Can be characterized by the local magnetic field, BL ~ several Gauss and a precession period of a nuclear spin in this field, N ~10-4 s ...
... Can be characterized by the local magnetic field, BL ~ several Gauss and a precession period of a nuclear spin in this field, N ~10-4 s ...
Course Descriptions
... semiconductor optoelectronic devices: optical properties of semiconductors, optical gain and absorption, wave guiding, laser oscillation in semiconductors; LEDs, physics of detectors, applications. Prerequisite: EE 3310 or equivalent. (3-0) R MSEN 6321 (EEMF 6321) Active Semiconductor Devices (3 se ...
... semiconductor optoelectronic devices: optical properties of semiconductors, optical gain and absorption, wave guiding, laser oscillation in semiconductors; LEDs, physics of detectors, applications. Prerequisite: EE 3310 or equivalent. (3-0) R MSEN 6321 (EEMF 6321) Active Semiconductor Devices (3 se ...
... that orientation with respect to the geomagnetic field can be determined by synchronous detection of electrosensory signals at harmonics of the vestibular frequency. The sensitivity required for this compass-sense mechanism is shown to be less than that known from behavioral experiments. Recent atta ...
Superconductivity
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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.