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Stroke extraction plays an important role in the analysis of handwritten Chinese character. Ambiguous zones like intersections and junctions of strokes always bring difficulties for the extraction. The skeleton obtained by thinning algorithm is easy to be distorted in these areas. To solve this problem, an effective method to extract strokes using ambiguous zone information is proposed in this paper...
Triggered vacuum switch (TVS) synthesizes the merits of spark gap and vacuum technology. A TVS sample with multi-gap is described in this paper, in which the main electrode is made up of spatially interleaved rods of opposite polarity on a ring. Three pairs of rods are adopted, which can form six main gaps, promoting the high current carrying ability evidently. Due to hundreds of high current pulses,...
Triggered vacuum switch (TVS) shows good performances when used in the field of pulsed power system. The time delay and lifetime are the important features of TVS. Massive experiments are carried out to measure and analyze the time delay and lifetime characteristic of TVS with multi-rod system. The results show that the time delay is strongly influenced by the polarity effect. The lifetime experiments...
A three-electrode spark gap, with trigger electrode inside the lower electrode, is discussed in this paper. Some characteristics have been determined experimentally such as the influence of the air pressure on spark gap operation and the influence of the working undervoltage ratio on spark gap operation. Delay times were measured, and the statistical analysis of the obtained results is presented in...
Triggered vacuum switch (TVS) is one of the important switch apparatuses in the fields of pulsed power system, due to its quick switch, rapid dielectric recovery, small volume, convenient trigger system, and simple structure, etc. A sample of field-breakdown TVS was fabricated and its turning-on experiments were done. Initial plasmas played an important role in the turning-on process of TVS, so the...
Triggered vacuum switch (TVS) has found fast growing applications in the fields of pulse power system. However, its popularization is still limited due to the trigger stability and accuracy. Research on the trigger process of TVS is one of valid ways to enhance the TVS performances. A sample of TVS was fabricated in this paper. A test circuit was set up with an inductance of 46.4 muH and a group of...
Triggered vacuum switch (TVS) is one of the important switch apparatuses in the fields of high-pulsed power system. Its working lifetime is due to trigger failure of the trigger pin, so the parameters of trigger source become the key of lifetime dilatation. A sample of field-breakdown TVS coated with nothing is fabricated, which has much longer lifetime than the TVS coated with trigger materials,...
The reconnection electromagnetic launcher utilizes the interaction between the projectile eddy current and the coil magnetic field to accelerate the projectile. A reconnection launch experimental system using the box-shaped helical coils and the flat-plate projectile has been fabricated. Capacitor banks are used as the power supplies. The inductance gradient curve-fitting is performed on the basis...
Vacuum arc, as the key element of vacuum circuit breakers, is one of the important subjects in the field of high voltage apparatus. The forms of vacuum arc have great influence on the breaking capacity and reliability of vacuum circuit breakers. In this paper an experimental set-up of vacuum arc was designed for getting dynamic images of vacuum arc in short gap. At the same time a vacuum arc mode...
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