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Aiming at the problem of retention time shift in chromatographic fingerprints of herbal medicine, a method for automatic identification peaks based on fuzzy matching was proposed, which extracted features according to relative retention factor, introduced the principles of “maximal matching degree” and “beyond threshold value”. The method was successfully applied in the experiment on the 28 chromatographic...
In this paper, a new type RV dispenser cathode is developed as it is capable of meeting the growing requirements concerning life and current density. This kind of RV dispenser cathode shows the higher emission current density and longer lifetime than that of convention dispenser cathodes. Temperature and current accelerated life test are used to evaluate the new type cathodes. At present, the results...
Why M-type cathode has higher emission performance? This is an undecided important problem for over 20 years. In this article, SRPES is used to study the chemical state of O on the surface of cathodes coated with Os or W film. It can be found that Ba/O and the content of low binding energy O species on the cathode surface coated with Os film are higher than that on W coated film remarkably. It is...
Since 2002, an accelerated life test has launched for a new long-life cathode at four different temperatures (1050°C, 1090°C, 1130°C and 1170°C) and fixed current density (2A/cm2) in IECAS. According to the relationship between the cathode life and operating temperatures, an accelerated equation has been set up. The cathode life at normal operating temperature is deducted based on results of the accelerated...
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