Search

In this paper, a novel method for fabricating a static induction thyristor has been put forward, using silicon direct bonding instead of traditional epitaxy during the construction of a cathode. Thus, an obvious improvement of the breakdown value of gate–cathode junction has been observed and consequently the gate controllability on anode voltage has been enhanced. The bonded interface has been studied. Some adjustments in technology have been adopted to enhance the bonding quality. A way to guarantee the consistency of the breakdown voltage of gate junction with respect to the cathode has been advanced. Some measurements of I–V characteristic of SDB–SITH have been carried out and the practical result is also listed. A comparison between the SDB–SITH and epitaxial SITH has been made, mainly on I–V and the switching time.

2D barcode identification is a hot topic in the field of image processing. This paper shows the analysis of 2D barcode structure and the development at home and abroad. A 2D barcode recognition system based on image processing was proposed. The segmentation and denoising algorithm were improved. The identification and decoding of 2D barcode was realized in VC + + programming environment. The recognition efficiency of the barcode was successfully increased. It pushes the promotion and development of 2D barcode.

One of the key technologies for optical fiber vibration pre-warning system (OFVWS) refers to identifying the vibration source accurately from the detected vibration signals. Because of many kinds of vibration sources and complex geological structures, the implement of identifying vibration sources presents some interesting challenges which need to be overcome in order to achieve acceptable performance. This paper mainly conducts on the time domain and frequency domain analysis of the vibration signals detected by the OFVWS and establishes attribute feature models including an energy information entropy model to identify raindrop vibration source and a fundamental frequency model to distinguish the construction machine and train or car passing by. Test results show that the design and selection of the feature model are reasonable, and the rate of identification is good.