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Scandate cathode is the most promising cathode type which can be utilized in THz devices. There is a wide transition region in the I-V characteristics of scandate cathode. The low slope and dual slope in the I-V characteristics according with Child-Langmuir law will be discussed in this paper.
Different average diameter matrix powders are used in the preparation of the scandate dispenser cathode. Based on a series of techniques such as pressing, sintering and impregnating, the scandate dispenser cathode samples are gained. The results show that: the cathodes made of the different average diameter powders which D(5,0) are 0.45μm, 1.3μm, 2.2μm exhibit excellent performance. The pulse emission...
A high secondary yield of 18.3 at 1KeV primary beam energy was found, with the B-doped diamond sample left in air for weeks and subject to no treatment prior to the measurement. Oxidation treatment destroys negative electron affinity (NEA) whereas heating in vacuum substantially regains NEA.
Lamivudine (LVD) is one of the popular drugs to be used for anti-hepatitis B virus infection therapy. About 39% HBeAg-positive chronic hepatitis B (CHB) patients can achieve serum hepatitis B virus (HBV) DNAs below the low limit of test after one years' treatment. However the antiviral-resistance HBV mutation to LVD treatment is near 60% after three year's therapy. Combination treatment is one method...
Summary form only given. In this paper, the research on the emission performance and the nonuniform emission of M-type cathode, impregnated scandate cathode, oxide cathode, and novel scandia-doped dispenser cathode are mentioned, the factors affecting the emission uniformity are discussed. The cathode's normal and abnormal "Schottky" phenomena in the case of high current density are also...
We measured SDDCs emission property and made comparison with impregnated scandate (I-Sc). A reasonable explanation on abnormal Schottky effect of SDDCs is given. The authors proposed a "semiconductor-monolayer superposition" model to explain emission mechanism of all kinds of thermionic cathodes, including oxide cathodes, M-type cathodes and scandate cathodes. Finally, from the view of engineering...
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