- Atom Indonesia
... investigated operating parameters are the puller voltage, the magnetic field, the hydrogen gas flow rate and the cathode current. The results showed that the puller voltage is the most sensitive parameter to change ion beam current, and at a voltage of 8 kV an ion beam current of 35 µA was obtained, ...
... investigated operating parameters are the puller voltage, the magnetic field, the hydrogen gas flow rate and the cathode current. The results showed that the puller voltage is the most sensitive parameter to change ion beam current, and at a voltage of 8 kV an ion beam current of 35 µA was obtained, ...
Simple Analytical Expressions for the Force and Torque of Axial
... 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results. Index Terms— Torque transmission, axial magnetic coupling, analytical model, axial force. ...
... 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results. Index Terms— Torque transmission, axial magnetic coupling, analytical model, axial force. ...
Name
... b) Roughly at the center of a sheet of white paper draw a point, then a vertical line through it. Using the protractor draw the perpendicular to the line at that same point. Using the protractor draw the 45 degree lines through the same center point. c) Place this paper on a wooden surface (table), ...
... b) Roughly at the center of a sheet of white paper draw a point, then a vertical line through it. Using the protractor draw the perpendicular to the line at that same point. Using the protractor draw the 45 degree lines through the same center point. c) Place this paper on a wooden surface (table), ...
Mitigation of Power-Frequency Magnetic Fields
... harmful influence to our health. In addition, interferences caused by power frequency magnetic fields (PFMFs) on electron beam based electronic equipment (e.g. cathode ray tubes found in TV screens and computer monitors, electron microscopes) become evident at levels over 1 microtesla. These issues ...
... harmful influence to our health. In addition, interferences caused by power frequency magnetic fields (PFMFs) on electron beam based electronic equipment (e.g. cathode ray tubes found in TV screens and computer monitors, electron microscopes) become evident at levels over 1 microtesla. These issues ...
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.