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In order to study the characteristics of barium tungsten cathodes coated with Os film during activation, a photoelectron spectroscopy using synchrotron radiation (SPRES) at Beijing Synchrotron Radiation Laboratory is utilized. SPRES is a far more sensitive tool to determine surface composition than either XPS or AES. The cathode, manufactured by ourselves, has a stated impregnant composition of 6BaO/CaO/2Al...
In order to study the electron emission phenomenon of evaporator of an impregnated cathode, a special device is designed, which includes barium tungsten cathode, tungsten receiver, vacuum system, data acquisition unit, etc. The characteristics of the impregnated cathode are as follows: Φ 8.0 mm x 2.5 mm, 25% porosity of porous tungsten matrix, 6BaO/CaO/2Al2O3 impregnant. While the tungsten receiver...
Based on unascertained theory, the paper introduced the modeling process of unascertained measure evaluation. Unascertained measure model can achieve ordered division on evaluation space and improve the discernibility degree, which produces reliable evaluation results. Applying the unascertained measure model to analyze and evaluate the community informatization level may provide new ways and means...
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