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A CdTe detector equipped with Timepix can work in both counting mode and time over threshold (TOT) mode. When it works in TOT mode, the count recorded in each pixel represents the amount of collected charge. TOT mode provides an easy and direct way to measure the spectra of sources. A pixelated detector in TOT mode also makes it possible to observe and analyze charge sharing between pixels. The energy...
A high precision and high resolution time-to-digital converter (TDC) implemented in a 40 nm fabrication process Virtex-6 FPGA is presented in this paper. The multi-chain measurements averaging architecture is used to overcome the resolution limitation determined by intrinsic cell delay of the plain single tapped-delay chain. The resolution and precision are both improved with this architecture. In...
Since the 1990s, there has been a dramatic interest in quantum communication. Quantum communication has become the hotspot of future information technology research because of its unique advantages in improving the security, capability and efficiency of information transmission. Free space quantum communication is being developed to ultra-long-distance satelliteto- ground quantum experiment, which...
The sociological background of particle swarm optimization is analyzed, and for preventing from premature convergence, a modified approach to enhance organizational management mechanism in group is proposed. Two sub-swarms evolutionary particle swarm optimization based on team progress learning is proposed by borrowing ideas from social division and progress learning ideas in management team. The...
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