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您的检索式：作者名="Pengjun Fang"
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| 1 | High speed true random number generator with a new structure of coarse-tuning PDL in FPGA显示文摘A metastability-based TRNG(true random number generator) is presented in this paper, and implemented in FPGA. The metastable state of a D flip-flop is tunable through a two-stage PDL(programmable delay line).With the proposed coarse-tuning PDL structure, the TRNG core does not require extra placement and routing to ensure its entropy. Furthermore, the core needs fewer stages of coarse-tuning PDL at higher operating frequency,and thus saves more resources in FPGA. The designed TRNG achieves 25 Mbps @ 100 MHz throughput after proper post-processing, which is several times higher than other previous TRNGs based on FPGA. Moreover, the robustness of the system is enhanced with the adoption of a feedback system. The quality of the designed TRNG is verified by NIST(National Institute of Standards and Technology) and also accepted by class P1 of the AIS-20/31 test suite. | Hongzhen Fang Pengjun Wang Xu Cheng Keji Zhou | 2018 | Journal of Semiconductors2018，39，3： | 0 |
| 2 | Phase field simulation of dendrite growth in gas atomized binary Al-Ni droplets显示文摘Catalytic powders with fine microstructures can be produced from a rapidly solidified gas atomized Al-Ni alloy.The solidification microstructure of the droplets is closely linked with heat flow conditions.Thus,the heat transfer conditions between the gas and droplet are essential to microstructural evolution.In this study,a phase field model for simulating single and multiple dendrite growth in a binary Al-Ni alloy was constructed and the microstructural evolutions occurring during a gas atomization process were evaluated.Temporal variations in the heat transfer coefficient and the boundary heat flux were taken into account.The results revealed that the heat transfer coefficient of the atomized droplet in flight is correlated with the droplet size and the relative velocity between the droplet and the atomizing gas.During the simulation,the competition between boundary heat flux extraction and latent heat release from phase transition causes a recalescence process in thermal history,thereby affecting the gradient temperature distribution and,consequently,the dendrite morphology.Dendrite growth under the effects of the heat transfer coefficient is restrained continuously because of the decreasing amount of extraction.The computational results confirmed the fine homogeneous microstructure and low microsegregation levels of gas atomized powders. | Yuntao Cai Pengjun Fang Xinggang Li Yi Xu | 2020 | Particuology2020，18，3： | 0 |
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