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RISS 인기검색어
- 검색키워드
- 저자 : Wang Qibiao (검색결과 4 건)
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Gamma-Ray Source Positioning Using Array NaI(Tl) Detectors in the Radiation Portal Monitors
Qibiao Wang,Chao Deng,Jian-Bo Yang,Rui Shi,Songbai Zhang,Xianguo Tuo 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.3
Radiation portal monitors (RPMs) are globally employed in ports to decrease the illicit trafficking of nuclear materials. Most RPMs are generally considered as threshold devices because they utilize large plastic scintillators, which have limited energy resolution and no position sensitivity, to count the gamma-rays and neutrons emitted by nuclear materials. Hence, we designed an RPM detector system with NaI(Tl) detectors inserted into the plastic scintillators to realize gamma-ray source identification and positioning. In this work, a 2D gamma-ray source positioning algorithm based on the attenuation law and solidangle variation was studied with the simulation results, and the variation of the positioning deviations with the real positions was spline interpolated to calibrate the calculated position. The testing experiment showed a small root mean square error (RMSE) for both x (0.86 cm) and y (1.52 cm) after calibration.
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Ultrashort pulse laser processing of ZrO2 ceramics
Qibiao Yang,Yunhan You,Bojin Cheng,Lie Chen,Jian Cheng,Deyuan Lou,Yutao Wang,Dun Liu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.2
It is crucial to investigate the mechanism of ultrashort pulse laser processing of ZrO2 ceramics to improve its processingaccuracy and efficiency. An ultrashort pulse laser was used to fabricate square grooves on the surface of ZrO2 ceramics. Thedepth, surface roughness, and surface topography of grooves were analyzed by the laser confocal microscope, optical profiler,and scanning electron microscope. The effects of different laser parameters on the material removal efficiency and processingquality of ZrO2 ceramics were studied. The results show that as the laser fluence increases, material removal efficiency firstincreases and then decreases, while the surface roughness first decreases and then increases. The heat accumulation effect issevere when using high repetition frequency, and the processed surface shows melt damage. As the pulse width increases from390fs to 6ps, the ablation threshold increases from 1.28 J/cm2 to 1.92 J/cm2. However, the material removal efficiency decreasesgradually. Furthermore, the material removal efficiency in burst mode significantly reduces due to the plasma shielding andredeposition of distinct granular deposits within the grooves. These findings can serve as a guide for controlling and optimizingthe process parameters of an ultrashort pulse laser processing of ZrO2 ceramics.
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Preparation and characterization of boron films used for boron-lined gaseous neutron detectors
Deng Chao,Wang Qibiao,Wu Yadong,Peng Shuming,Liu Fule,Li Huailiang,Cheng Jianfeng,Tuo Xianguo 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.7
Boron-lined gaseous neutron detectors are being widely used in neutron detection to replace 3He proportional counters, and the boron film’s parameters comprise the key factors influencing the performance of such detectors. However, the method of characterizing boron film is relatively simple at present. In this study, boron films stuck to ultrathin glass substrate with different mass proportions of epoxy to natural boron (MPENBs) were prepared. A variety of characterization methods, including scanning electron microscopy, energy-dispersive X-ray spectroscopy, white-light interferometry, and multiple tape tests, were used to test the boron films simultaneously, and the test results are discussed herein. Moreover, neutron imaging was conducted to analyze the uniformity of boron-10 atoms. These characterization results demonstrate that the optimized MPENB formulation is 0.16 with the boron atomic ratio of chemical elements (ARCE) at approximately 68.8% and surface roughness Sa = 1.457 μm and that the structure of boron film is uniform and fluffy, contributing to improving the boron-lined method.
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Coupling mechanism optimization to improve misalignment tolerance in UAV wireless charging systems
Cancan Rong,Jin Chang,Qibiao Lu,Wenlong Liu,Yongchao Zhao,Yujie Liu,Mengmeng Chen,Haoyang Wang,Yachao Liu 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.9
Wireless power transfer (WPT) technology has been extensively developed for unmanned aerial vehicle (UAV) application in recent years. However, misalignment tolerance has always been an unsolved problem for UAV wireless charging. In this paper, a coupling system attached to UAV landing gear is demonstrated. In the design process, a flexible curved coil has been designed for structure utilization. First, the magnetic induction strength of the arch bending coil is calculated. Then, an unequal turn spaced coil structure is proposed based on the genetic algorithm for parameter optimization. In addition, a 3D EM simulation is implemented for comparison before and after optimization. A resonance frequency of 75 kHz with an SS tuning topology is adopted in accordance with the Qi standard. Finally, the experimental setup is made and the results show that the UAV charging system has better misalignment tolerance.
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