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A high di/dt MOS-controlled thyristor with cathode-short structure (CS-MCT) is developed for pulse power applications. Compared with conventional MCT (con-MCT), the cathode short in the proposed CS-MCT greatly improves the dV/dt robustness. To achieve simultaneously high di/dt capability, special design of device characteristics parameter and consideration of 2-D transient carrier transport are carried...
Airport Traffic Control Tower (ATCT) ergonomics determines the humanization design effect of Human Machine Interface (HMI), and the inconsistence of HMI is a leading cause of air traffic controller errors. In this paper, an evaluation index system of ATCT ergonomics is given and applied in China. This survey is useful and helpful for the formulation of unified ATCT ergonomics standards and improving...
A highly stable non-cyanide electroplating bath which can maintain clear at least one month was developed based on Au(III)-Sn(II) using 5,5-dimetheyl-hydantoin (DMH) and pyrophosphate as complexes. The combination of DMH and pyrophosphate can effectively minimize the difference of the deposition potentials between Au and Sn, making the codeposition of Au-Sn alloys possible. The cyclic voltammetry...
Au-30at.%Sn bumps play a very important role in high-power LED chip packaging. The Au-30at.%Sn bumps are usually fabricated by electron-beam evaporation and sputtering. These techniques are either costly or difficult in operation. Moreover, it is difficult to fabricate solder bumps with the continuously downsizing. Co-electroplating is a promising alternative. In the present work, Au-Sn films were...
A high efficiency power combining demonstration is presented in this paper of 2 X-band TWTAs based on magic-T corporate combiner. A low loss, amplitude and phase balanced, high isolation and power waveguide magic-T combiner is designed. Power combining efficiencies of greater than 90% and output power of more than 85W over a 0.7GHz frequency band are successfully demonstrated by introducing phase...
In this paper, an omni-directional cylindrical patch array antenna using liquid crystal polymer (LCP) technology is designed, the proposed antenna is composed of 8 linear sub-arrays fed by three-stage T-junction power divider network, and each sub-array contains 5 series-fed rectangular microstrip patches. Comparisons between measured and simulated results verify that the cylindrical patch array antenna...
This paper surveys the swimming robot. At first, the paper introduces the current issues and challenges on micro robot and swimming robot. Then, it describes two different types of swimming robot respectively, including the snake-like swimming robot and the microorganism microrobot. As for each type of swimming robot, the corresponding propel mechanism, basic theory and current research are discussed...
A new method is proposed based on fractional differential, which can enhance the remote sensing image, especially the texture details. First, the properties of fractional differential are discussed, and some important conclusions are drawn. Then, the numerical algorithm of fractional differential is studied, and an operator is constructed, by which the operation of fractional differential can be implemented...
Detection of local feature covariant region is a new technology of image contents and image semantic representations, and it has become an important foundation of the image recognition, learning and understanding. First, a Laplace of Gaussian corner detection method is proposed based on edge contour curves, in the meantime, a new local feature descriptor, named covariant support region, is introduced...
The paper proposed a novel ant colony optimization (ACO) and quantum particle swarm optimization (QPSO) method for spatial clustering with obstacles constraints (SCOC). We first developed AQPGSOD using ACO and QPSO based on grid model to obtain obstructed distance, and then we presented a new QPKSCOC based on QPSO and K-Medoids to cluster spatial data with obstacles. The experimental results show...
Spatial Clustering with Obstacles Constraints (SCOC) has been a new topic in Spatial Data Mining (SDM). Spatial Obstructed Distance (SOD) is the key to SCOC. The obstacles constraint is generally ignored in computing distance between two points, and it leads to the clustering result which is of no value, so obstructed distance has a great effect upon clustering result. In this paper, we propose a...
Spatial clustering has been an active research area in the data mining community. Spatial clustering is not only an important effective method but also a prelude of other task for spatial data mining (SDM). In this paper, we propose an improved ant colony optimization (IACO) and quantum particle swarm optimization (QPSO) method for spatial clustering with obstacles constraints (SCOC). In the process...
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