Electric current certain materials when cooled below a characteristic critical temperature. It was discovered by 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. In a semiconductor it is sometimes useful to think of the current as due to the flow
Heike ondo Heike ondo Heike ondo (平家音頭) is a Japanese folk song that originates from Shimonoseki, Yamaguchi Prefecture in Japan. The song is basically a narrative of the Battle of Dan-no-ura, which was a major sea battle of the Genpei War, occurring at Dan-no-ura, in the Shimonoseki Strait. It is played during the summer to accompany the Heike Odori, which is the bon dance of the area. Heike Ondo has a quick, up-beat tempo, and it is always performed with particular taiko ensembles including two taiko drums and a sake barrel, called a "taru", each. A single drummer alternates between the two