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| 1 | Effect of photoionisation on initial discharge in air under nanosecond pulse voltage显示文摘Effects of photoionisation on the development and electron runaway of the initial discharge in atmospheric air under nanosecond pulse voltage were studied via twodimensional particle-in-cell/Monte Carlo collision simulations.It was found that photoionisation has little effect at the beginning of the initial discharge.However,as the discharge channel gradually develops towards the anode,photoionisation shows greater impacts on the morphology of discharge but has little influence on the velocity of discharge development.Photoionisation does not appear to have a decisive effect on the growth trend of the highest energy of runaway electrons,but it does affect the change rate of the highest energy and overall distribution of electron energy,resulting in a higher proportion of energetic electrons.The difference in the distributions of the electron energy between the two cases,with and without considering photoionisation,can be attributed to the impact of photoionisation on the discharge morphology,which in turn distorted the electric field.The spatial density distributions of the electrons produced by photoionisation further explained the differences.The authors’results explicitly demonstrate the influence of photoionisation on the development and the electron runaway of the initial discharge under nanosecond pulse voltage,which provides more comprehensive knowledge for the atmospheric air gap nanosecond pulse discharge physics. | Yutai Li Yangyang Fu Zhigang Liu Handong Li Peng Wang Haiyun Luo Xiaobing Zou Xinxin Wang | 2023 | High Voltage2023，8，2： | 2 |
| 2 | Downcutting and uplifting in the middle part of Qinling orogenic belt during the late Quaternary显示文摘Layered cave passages formed on the walls of the Qianyou River valley in the middle part of the Qinling Mountains since the Pleistocene due to the intermittent uplifts. 12 speleothem samples near ruins of palaeowater tables in 3 cave passages are dated by using the Th method. The results show that the 3 caves began to uplift (358±38) ka, (247±28) ka, (118±19) ka ago respectively. Given the differences of elevation between the caves, we could obtain the downcutting rates of the valley: (0.23±0.02) mm/a during 358 -247 ka, (0.19±0.03) mm/a during 247-118 ka, and (0.51(0.08) mm/a since 118 ka. This implies that more and more strong uplifting sustained in the middle part of Qinling since 358 | WANG Fei LI Hongchun ZHU Rixiang HU Yutai | 2002 | Chinese Science Bulletin2002，47，18： | 0 |
| 3 | Boosting C–C coupling to multicarbon products via high-pressure CO electroreduction显示文摘Electrochemical CO reduction reaction(CORR) provides a promising approach for producing valuable multicarbon products(C_(2+)), while the low solubility of CO in aqueous solution and high energy barrier of C–C coupling as well as the competing hydrogen evolution reaction(HER) largely limit the efficiency for C_(2+)production in CORR. Here we report an overturn on the Faradaic efficiency of CORR from being HER-dominant to C_(2+)formation-dominant over a wide potential window, accompanied by a significant activity enhancement over a Moss-like Cu catalyst via pressuring CO. With the CO pressure rising from 1 to 40 atm, the C_(2+)Faradaic efficiency and partial current density remarkably increase from 22.8%and 18.9 mA cm^(-2)to 89.7% and 116.7 mA cm^(-2), respectively. Experimental and theoretical investigations reveal that high pressure-induced high CO coverage on metallic Cu surface weakens the Cu–C bond via reducing electron transfer from Cu to adsorbed CO and restrains hydrogen adsorption, which significantly facilitates the C–C coupling while suppressing HER on the predominant Cu(111) surface, thereby boosting the CO electroreduction to C_(2+)activity. | Wenqiang Yang Huan Liu Yutai Qi Yifan Li Yi Cui Liang Yu Xiaoju Cui Dehui Deng | 2023 | Journal of Energy Chemistry2023，，10： | 0 |
| 4 | Range and similarity of hollow cathode discharge in argon显示文摘Hollow cathode discharge and micro-hollow cathode discharge have numerous applications in the fields of industry,medical treatment,environmental protection,and analytical chemistry.However,many of them lack the typical features of hollow cathode mode,especially the applications at atmospheric pressure.In order to investigate the underlying basic science of hollow cathode discharge,the hollow cathode discharge in argon was studied by experiments.The range for the operation of the hollow cathode mode in the argon-aluminum device was quantitatively determined to be from 0.8 to 4 Torr cm,no matter how small the cathode cavity is.The atmospheric pressure operation of the hollow cathode mode was realised with the aluminum cathode of a 50μm cavity.The hollow cathode discharges were consistent with Townsend similarity law when the anode was very close to the cathode and the value of p·D was chosen at the lower limit of the range for hollow cathode mode.In contrast,if the anode was moved a little bit far from the cathode and the value of p D was significantly increased,the results followed Allis-White scaling law.The reason for the deviation of Allis-White scaling law from Townsend similarity law was given. | Xinyu Hou Xiaobing Zou Yutai Li Lunwei Zhang Xinxin Wang | 2019 | High Voltage2019，4，3： | 0 |
| 5 | Leaky Cable Fixture Detection in Railway Tunnel Based on RW DCGAN and Compressed GS-YOLOv5显示文摘The communication system of high-speed trains in railway tunnels needs to be built with leaky cables fixed on the tunnel wall with special fixtures.To ensure safety,checking the regular leaky cable fixture is necessary to elimi-nate the potential danger.At present,the existing fixture detection algorithms are difficult to take into account detection accuracy and speed at the same time.The faulty fixture is also insufficient and difficult to obtain,seriously affecting the model detection effect.To solve these problems,an innovative detection method is proposed in this paper.Firstly,we presented the Res-Net and Wasserstein-Deep Convolution GAN(RW-DCGAN)to implement data augmentation,which can enable the faulty fixture to export more high-quality and irregular images.Secondly,we proposed the Ghost SENet-YOLOv5(GS-YOLOv5)to enhance the expression of fixture feature,and further improve the detection accuracy and speed.Finally,we adopted the model compression strategy to prune redundant channels,and visualized training details with Grad-CAM to verify the reliability of our model.Experimental results show that the algorithm model is 69.06%smaller than the original YOLOv5 model,with 70.07%fewer parameters,2.1%higher accuracy and 14.82 fps faster speed,meeting the needs of tunnel fixture detection. | Suhang Li Yunzuo Zhang Ruixue Liu Jiayu Zhang Zhouchen Song Yutai Wang | 2023 | Intelligent Automation & Soft Computing2023，，7： | 0 |
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