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- 저자 : Zhiyong Duan (검색결과 4 건)
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Xiong Zhiyong,Wen Zhuoqi,Cui Zhongjie,Mei Shiliang,He Haiyang,Duan Zhongtao,Zhang Wanlu,Xie Fengxian,Guo Ruiqian 한국물리학회 2023 Current Applied Physics Vol.45 No.-
Hysteresis effects in self-luminous devices like organic light-emitting diodes (OLEDs) and perovskite light-emitting diodes (PeLEDs) have been discovered recently, besides emerging in thin film transistors (TFTs). However, the influences of lateral leakage caused by next-door devices on hysteresis effects in flexible OLEDs array have rarely been demonstrated. To mitigate the impact of lateral leakage and figure out the detailed relationship with hysteresis effects, a series of experiments for OLEDs array involving p-doping in holes transport layer (HTL) were employed. It is found that the lateral leakage and hysteresis effects have a trade-off exhibition, which means stronger lateral leakage has induced weaker hysteresis effects. In order to get rid of the role of lateral leakage, the experiments with mono blue devices were also performed to substantiate the intrinsic hysteresis effects existence. The research opens the possibility of considering more internal relationships between different performances on self-luminous arrays for their actual application.
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Wenjuan Lou,Hang Bai,Mingfeng Huang,Zhiyong Duan,Rong Bian 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.31 No.2
The first step of performance-based design for transmission lines is the determination of wind fields as well as wind loads, which are largely depending on local wind climate and the surrounding terrain. Wind fields in a mountainous area are very different with that in a flat terrain. This paper firstly investigated both mean and fluctuating wind characteristics of a typical mountainous wind field by wind tunnel tests and computational fluid dynamics (CFD). The speedup effects of mean wind and specific turbulence properties, i.e., turbulence intensity, power spectral density (PSD) and coherence function, are highlighted. Then a hybrid simulation framework for generating three dimensional (3D) wind velocity field in the mountainous area was proposed by combining the CFD and proper orthogonal decomposition (POD) method given the properties of the target turbulence field. Finally, a practical 220 kV transmission line was employed to demonstrate the effectiveness of the proposed wind field generation framework and its role in the performance-based design. It was found that the terrain-induce turbulence effects dominate the performance-based structural design of transmission lines running through the mountainous area.
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Power control of CiADS core with the intensity of the proton beam
Kai Yin,Wenjing Ma,Wenjuan Cui,Zhiyong He,Xinxin Li,Shiwu Dang,Feng Yang,Yuhui Guo,Limin Duan,Meng Li,Yikai Hou 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
This paper reports the control method for the core power of the China initiative Accelerator DrivenSystem (CiADS) facility. In the CiADS facility, an intense external neutron source provided by a protonaccelerator coupled to a spallation target is used to drive a sub-critical reactor. Without any control rodinside the sub-critical reactor, the core power is controlled by adjusting the proton beam intensity. Inorder to continuously change the beam intensity, an adjustable aperture is considered to be used at theLow Energy Beam Transport (LEBT) line of the accelerator. The aperture size is adjusted based on theProportional Integral Derivative (PID) controllers, by comparing either the setting beam intensity or thesetting core power with the measured value. To evaluate the proposed control method, a CiADS coremodel is built based on the point reactor kinetics model with six delayed neutron groups. The simulations based on the CiADS core model have indicated that the core power can be controlled stably byadjusting the aperture size. The response time in the adjustment of the core power depends mainly onthe adjustment time of the beam intensity
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Measurement of TOF of fast neutrons with <sup>238</sup>U target
Li, Meng,Guan, Yuanfan,Lu, Chengui,Zhang, Junwei,Yuan, Xiaohua,Duan, Limin,Yang, Herun,Hu, Rongjiang,He, Zhiyong,Wei, Xianglun,Ma, Peng,Gan, Zaiguo,Yang, Chunli,Zhang, Hongbin,Chen, Liang,Qiu, Tianli Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
We developed a Dual-PPACs detector for fast neutron measurements that consists of two sets of PPAC: conventional PPAC and fission PPAC. A<sup>238</sup>U(U<sub>3</sub>O<sub>8</sub>) coating is placed in the fission PPAC's anode, which is used as the neutrons conversion layer. An experiment was performed to measure neutron time-of-flight (TOF) in which <sup>252</sup>Cf spontaneous fission source was used. An excellent time resolution of 164ps has been observed at 6 mbar in isobutene gas. With the excellent time resolution of Dual-PPACs detector, exact neutron energy can be extracted from the timing measurement. The experimental detection efficiency was 1.9 × 10<sup>-7</sup>, consistent with the efficiency of 2.5 × 10<sup>-7</sup> given by a Geant4 simulation. Ultimately, the results show that the Dual-PPACs detector is a suitable candidate for measuring fast neutrons in the future CiADS system.
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