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| 1 | Capacitive Imaging Technique for the Inspection of Composite Sucker Rod显示文摘Composite sucker rod has been extensively used due to its high strength, light weight and corrosion resistive nature. However, such composite sucker rod is diffcult for conventional non-destructive evaluation(NDE) techniques to inspect because of its complex material and/or structure. It is thus useful to embark research on developing novel NDE technique to comply the inspection requirement. This work demonstrates the feasibility of using the capacitive imaging(CI) technique for the inspection of composite sucker rod. Finite element(FE) models were constructed in COMSOL to simulate the detection of defects in the glass-fiber layer and on the carbon core surface. An FE Model based inversion method is proposed to obtain the profile of the carbon core. Preliminary CI experimental results are then presented, including the detection of surface wearing defect in the glass-fiber layer, and obtaining the profile of the carbon core. A set of accelerated aging experiments were also carried out and the results indicate that the CI technique is potentially useful in evaluating the ageing status of such composite sucker rod. The CI technique described in this work shows great potential to target some challenging tasks faced in the non-destructive evaluation of composite sucker rod, including quality control, defect detection and ageing assessment. | Kefan Wang Xiaokang Yin Chen Li Wei Li Guoming Chen | 2019 | Chinese Journal of Mechanical Engineering2019，32，6： | 2 |
| 2 | Group decision-making in an unconventional emergency situation using agile Delphi approach显示文摘 | Kefan Xie Jia Liu Gang Chen Pan Wang Sohail S. Chaudhry | 2012 | Information Technology and Management2012，，4： | 1 |
| 3 | High mass loading Ni_(4)Co_(1)-OH@CuO core-shell nanowire arrays obtained by electrochemical reconstruction for alkaline energy storage显示文摘The design of three-dimensional(30)core-shell hetercistructures is an efficient method to achieve high mass specific capacity of electroactive materials under high mass loading.In this work,porous Ni_(4)Co1-0H nanosheets with a mass loading of 7.7 mg·cm^(-2) are obtained by using Ni_(4)Cor(NO_(3))_(2)(0H)_(4) supported on the CuO nanowires as precursors via an unavoidable electrochemically induced phase reconstruction.During the electrochemical reconstruction process,the N03-anions in Ni_(4)Cor(N0_(3))_(2)(0H)_(4) are easily replaced by OH-anions in the electrolyte.The phase reconstruction is accompanied by the decrease of ionic diffusion.:resistance and the increase of pore volume,and the shift of binding energy.The obtained Ni4Co1-0H nanosheets show a high:mass specific capacity of 363.6 mAh·g^(-1) at 5 mA·cm^(-2).The as-fabricated alkaline hybrid supercapacitor and Ni-Zn battery deliver high energy density of 293.1 and 604.9 Wh·kg^(-1),respectively,indicating.excellent alkaline energy storage performance. | Yawei Yu Xiulan Hu Shuai Wang Handan Qiao Zeyu Liu Kefan Song Xiaodong Shen | 2022 | Nano Research2022，15，1： | 1 |
| 4 | Effects of Organic Fertilizers Made from Distiller's Grains on the Growth and Development of Flue-cured Tobacco显示文摘Pot experiments were conducted to study the effects of different organic fertilizers made from distiller's grains on the physiological characteristics and growth of flue-cured tobacco. The results showed that the agronomic traits and biomass of flue-cured tobacco in the three treatments were higher than that of the control group,and the mixed application of different organic fertilizers made from distiller's grains and compound fertilizer could promote the growth and development of flue-cured tobacco significantly. | Sheng JIANG Miao YANG Fei XIONG Yonghui ZHANG Chun XIA Jiao GUAN Kefan CAI Juntao HE Yuangai ZHANG Fei WANG Fuzhao NIAN | 2018 | Agricultural Biotechnology2018，7，3： | 1 |
| 5 | Valorizing carbon dioxide via electrochemical reduction on gas-diffusion electrodes显示文摘The electrochemical carbon dioxide(CO_(2))reduction provides a means to upgrade CO_(2)into value-added chemicals.When powered by renewable electric-ity,CO_(2)electroreduction holds the promise of chemical manufacturing with carbon neutrality.A commercially relevant CO_(2)electroreduction process should be highly selective and productive toward desired products,energetically efficient for power conversion,and stable for long-term operation.To achieve these goals,designing gas-diffusion catalytic electrodes and prototyping reactors built upon in-depth understandings of the reaction mechanisms are of para-mount importance.In this review,the fundamentals of gas-diffusion electrodes are briefly presented.Then,the most recent advances in developing high-performance CO_(2)reduction using gas-diffusion electrodes are overviewed.Reactor engineering aiming at enhancing productivity,energy efficiency,CO_(2)single-pass utilization,and operating lifetime is further discussed.Challenges in developing CO_(2)electroreduction systems are included.The prospects for advancing CO_(2)electroreduction toward practical applications are also narrated. | Yuqing Luo Kefan Zhang Yanguang Li Yuhang Wang | 2021 | InfoMat2021，3，12： | 1 |
| 6 | An Early Warning Model of Telecommunication Network Fraud Based on User Portrait显示文摘With the frequent occurrence of telecommunications and networkfraud crimes in recent years, new frauds have emerged one after another whichhas caused huge losses to the people. However, due to the lack of an effectivepreventive mechanism, the police are often in a passive position. Usingtechnologies such as web crawlers, feature engineering, deep learning, andartificial intelligence, this paper proposes a user portrait fraudwarning schemebased on Weibo public data. First, we perform preliminary screening andcleaning based on the keyword “defrauded” to obtain valid fraudulent userIdentity Documents (IDs). The basic information and account information ofthese users is user-labeled to achieve the purpose of distinguishing the typesof fraud. Secondly, through feature engineering technologies such as avatarrecognition, Artificial Intelligence (AI) sentiment analysis, data screening,and follower blogger type analysis, these pictures and texts will be abstractedinto user preferences and personality characteristics which integrate multidimensionalinformation to build user portraits. Third, deep neural networktraining is performed on the cube. 80% percent of the data is predicted basedon the N-way K-shot problem and used to train the model, and the remaining20% is used for model accuracy evaluation. Experiments have shown thatFew-short learning has higher accuracy compared with Long Short TermMemory (LSTM), Recurrent Neural Networks (RNN) and ConvolutionalNeural Network (CNN). On this basis, this paper develops a WeChat smallprogram for early warning of telecommunications network fraud based onuser portraits. When the user enters some personal information on the frontend, the back-end database can perform correlation analysis by itself, so as tomatch the most likely fraud types and give relevant early warning information.The fraud warning model is highly scaleable. The data of other Applications(APPs) can be extended to further improve the efficiency of anti-fraud whichhas extremely high public welfare value. | Wen Deng Guangjun Liang Chenfei Yu Kefan Yao Chengrui Wang Xuan Zhang | 2023 | Computers, Materials & Continua2023，，4： | 0 |
| 7 | Influence and mechanism of solar radiation intensity on the interdecadal variability of strong Meiyu events during historical periods显示文摘Most recent studies on Meiyu over the middle and lower reaches of the Yangtze River(MLRYR)have focused on its interannual variability or the mechanism of certain abnormal events.The influence and physical mechanism of solar radiation intensity on the interdecadal frequency of strong Meiyu events over the MLRYR during historical periods were investigated using reconstructed precipitation data,reconstructed solar radiation data,and model simulation data.First,according to the solar radiation intensity,the Ming and Qing Dynasties(1470-1850)were divided into three periods of strong solar radiation and three periods of weak solar radiation.It was found that during the periods of strong solar radiation,the frequency of strong Meiyu events was significantly higher than that during the periods of weak solar radiation in the reconstructed precipitation data and model simulations.Mechanism analyses show that during the periods of strong solar radiation,the Western Pacific Subtropical High(WPSH)is stronger,and the blocking highs over the middle-high-latitudes are also stronger,which is conducive to the continuous convergence of the southward cold air and the northward warm and humid air flow at the MLRYR.Therefore,a circulation spatial pattern conducive to the occurrence of strong Meiyu events is then induced.The probability distributions of precipitation also show that,during periods of strong solar radiation,changes in circulation patterns cause the probability distribution of precipitation to shift significantly to the right,increasing the probability of strong Meiyu events occurring on the right side of the probability distribution. | Liulin WANG Liang NING Kefan CHEN Mi YAN Jian LIU Zhengyu LIU Yanmin QIN Jiao XUE Chuxin LI | 2023 | Science China Earth Sciences2023，66，2： | 0 |
| 8 | Construction and experimental verification research of a magnetic detection system for submarine pipelines based on a two-part towed platform显示文摘With the acceleration of the investigation and development of marine resources,the detection and location of submarine pipelines have become a necessary part of modern marine engineering.Submarine pipelines are a typical weak magnetic anomaly target,and their magnetic anomaly detection can only be realized within a certain distance.At present,a towfish or an autonomous underwater vehicle(AUV)is mainly used as the platform to equip magnetometers close to the submarine pipelines for magnetic anomaly detection.However,the mother ship directly affects the towfish,thus causing control interference.The AUV cannot detect in real time,which affects the magnetic anomaly detection and creates problems regarding detection efficiency.Meanwhile,a two-part towed platform has convenient control,thus reducing the interference of the towed mother ship and real-time detection.If the platform can maintain constant altitude sailing through the controller,the data accuracy in the actual magnetic anomaly detection can be guaranteed.On the basis of a two-part towed platform,a magnetic detection system with constant altitude sailing ability for submarine pipelines was constructed in this study.In addition,experimental verification was conducted.The experimental verification research shows that the constant altitude sailing experiment of the two-part towed platform verifies that the platform has good constant altitude sailing ability in both a hydrostatic environment and the actual marine environment.Meanwhile,the offshore magnetic anomaly detection experiment of submarine pipelines verifies the stable measurement function of the magnetic field and the function of the system to detect magnetic anomaly of submarine pipelines. | Mianjin Wang Shikun Pang Kefan Jin Xiaofeng Liang Hongdong Wang Hong Yi | 2023 | Journal of Ocean Engineering and Science2023，8，2： | 0 |
| 9 | Improved Design of a Hydraulically Expanded Overhead Cylinder for an Automotive Torsion Beam显示文摘The design of hydro-bulge molds,able to provide hollow parts with special-shaped cross-sections,is still a pretty complicated task(especially for what concerns the design of the related hydraulic system and its“synchronization”).In the present work,this task is addressed through the introduction of a new type of overhead cylinder hydraulic synchronization system,able to correct automatically any deviation from the optimal process.Using the AMESim software,the displacement synchronization curve of the piston rods of the two cylinders is obtained and it is verified that the system is able to implement an automatic deviation correction function by adjusting the bidirectional servo valve.A mathematical model for the synchronization system is presented,and the transfer function of the closed-loop control system is determined accordingly.The results show that the system response is generated at about 0.1∼0.2 s with the system reaching an equilibrium state at about 0.2 s. | Kefan Yang Youmin Wang Kexun Fu Jiaqi Chen | 2023 | Fluid Dynamics & Materials Processing2023，19，5： | 0 |
| 10 | 北暖温带地区油松人工林天然发育恢复过程中的植被群落动态显示文摘本研究旨在揭示人工林在天然发育的恢复过程中其植物群落结构、多样性、种间关系和稳定性的变化特征。这种人工林的恢复过程依靠其与天然树种的交互作用实现,而不依赖于人为管理措施。在本研究中,依据油松(Pinus tabulaeformis)种群盖度占样方内乔木层盖度的比例,将八仙山国家级自然保护区的人工林天然发育序列划分为油松林、混交林和近自然3个典型阶段,并选择地域性天然次生林作为对照。以乔木层每木检尺数据为依据,重点关注群落的动态变化,包括群落结构、多样性、稳定性等方面。研究结果表明,在油松人工林天然发育的恢复过程中:(i)从混交林阶段开始形成稳定的优势种群组成,α多样性提高。(ii)乔木层径级结构由钟型向倒‘J’型转变,表明种群更新、发育状态良好。(iii)优势种群中胡桃楸(Juglans mandshurica)、蒙古栎(Quercus mongolica)、栓皮栎(Quercus variabilis)及紫椴(Tilia amurensis)的生态位宽度增加,但槲树(Quercus dentata)种群的生态位宽度在其发挥了先锋树种的作用之后下降。(iv)负关联和高生态位重叠(Levins生态位重叠指数>0.5)种群对比例下降。总之,保护区内的油松人工林在与天然树种交互作用的群落发育过程中促进了种群的更新和发育以及人工林群落的健康恢复,同时群落内的种间关系也在积极调整。本研究结论可以为揭示人工林群落天然发育过程中的动态变化特征提供有价值的参考。 | Zhenlu Qiu Mei Zhang Kefan Wang Fuchen Shi | 2023 | Journal of Plant Ecology2023，16，4： | 0 |
| 11 | Reduced-search guessing random additive noise decoding of polar codes显示文摘Guessing random additive noise decoding(GRAND) has attracted researchers since its introduction in [1]. For an additive noise channel with hard decision output, the algorithm checks all error patterns, and it schedules its search in descending likelihood order. | Kefan WANG Yuejun WEI Zhenyuan CHEN Huarui YIN Liping LI Wenyi ZHANG | 2023 | Science China(Information Sciences)2023，66，2： | 0 |
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