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Wear behavior of Zn-38Al-3.5Cu-1.2Mg/SiC_(p) composite under different stabilization treatments

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1270-1279页

作者： Sheng Liu Qing Yuan Yutong Sima chenxi Liu Fang han Wenwei Qiao The State Key Laboratory of Refractories and Metallurgy Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China Wuhan Heavy Industry Casting&Forging Co.Ltd. China State Shipbuilding Corporation LimitedWuhan 430080China Jiangsu Huaneng Cable Company Limited Gaoyou 225613China

A Zn-38Al-3.5Cu-1.2Mg composite reinforced with nano-SiC_(p) was fabricated via stirring-assisted ultrasonic *** improve the abrasive resistance of the Zn-38Al-3.5Cu-1.2Mg/SiC_(p) composite,several stabilization treatments with distinct solid solutions and aging temperatures were *** results indicated that the optimal stabilization treatment for the Zn-38Al-3.5Cu-1.2Mg/SiC_(p) composite comprised solution treatment at 380℃for 6 h and aging at 170℃for 48 *** stabilization treatment led to the formation of dispersive and homogeneous nano-SiC_(p).During the friction wear condition,the nano-SiC_(p) limited the microstructure evolution from the hardα(Al,Zn)phase to the softβ(Al,Zn)***,the increased amount of nano-SiC_(p) improved the grain dimension and contributed to the composite abrasive ***,the stabilization treatment suppressed the crack initiation and propagation in the friction wear process,thereby improving the abrasive resistance of the Zn-38Al-3.5Cu-1.2Mg/SiC_(p) composite.

关键词： composite ultrasonic vibration stabilization abrasive resistance microstructure evolution

Surface oxidation of carbon dots enables highly selective and sensitive chemiluminescence detection of hydroxyl radical

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Nano Research 2024年第11期17卷 9275-9283页

作者： Chan Wang Yuan Fang Dongrun Zhou chenxi Wu han Zhu Qijun Song Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China

The rapid quantification of hydroxyl radical (·OH) in real samples is a great challenge due to its highly reactive nature and the potential interferences from other coexisting reactive oxygen species (ROS). Herein, a chemiluminescence (CL) probe (ox-CDs) was rationally developed for the detection of ·OH through controlled oxidation treatment of original CDs (o-CDs) with H_(2)O_(2). Post-oxidation of CDs can reduce the surface defects or functional groups on the CDs, exposing reactive sites capable of effectively reacting with ·OH. The chemical energy generated from redox reaction between ·OH and the ox-CDs can be efficiently utilized to generate strong and selective CL responses to ·OH without interferences from other ROS. Thus, a highly selective and sensitive CL method with a linear range from 0.01 to 150 μM and a detection limit of 3 nM was developed, which was successfully applied for monitoring the ·OH production from cigarette and mosquito coil smoke.

关键词： carbon dots post-oxidation chemiluminescence probe detection of·OH cigarette and mosquito coil smoke

Visual servoing-based pneumatic hair transplantation mechanism for robotic FUE surgery

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Biomimetic Intelligence & Robotics 2023年第4期3卷 47-55页

作者： Fulin Jia Shenghao Yang chenxi han Junye Li Xuanru han Chao Zhang Jiaole Wang School of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Hair transplantation surgery is an effective solution for hair loss problems,among which follicle unit extraction(FUE)surgery is more widely used and *** present,most hair transplantation surgeries still rely heavily on manual operation by doctors and very few hair transplantation robots with complex structures have been *** paper proposes a pneumatic hair transplantation mechanism for FUE surgery,equipped with a camera,capable of automatically performing both hair implantation and extraction with *** pneumatic method eliminates the complex needle structure,has the function of temporarily storing the follicles inside the needle,thus facilitating the automation of transferring follicles from extraction to *** a visual feedback system is proposed to accurately position the follicles during the *** experimental results show that average distance deviation between the actual and target positions is 0.6128 mm and the average deviation of hair implantation depth is 1.7176 mm,which verify the feasibility of the proposed system.

关键词： Robotic hair transplantation Follicle unit extraction(FUE) Image-based visual servoing(IBVS)

Grouting-induced ground heave and building damage in tunnel construction:A case study of Shenzhen metro

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Underground Space 2022年第6期7卷 1175-1191页

作者： Zonglei Dong Xuemin Zhang chenxi Tong Xinlei Chen han Feng Sheng Zhang School of Civil Engineering Central South UniversityChangsha 410075China

This paper presents a case study of the grouting-induced ground heave and building damage in the tunnel construction of Shenzhen Metro Line 10,which passes through a crowded urban area with water-rich strata in Shenzhen,the province of Guangdong,*** was reported that the ground surface heave of up to approximately 500 mm was observed,and the customs building above the tunnels was seriously damaged because of a 200 mm *** a significant heave was closely associated with the advanced curtain grouting adopted in the tunnel *** this end,the heave of the ground surface and the displacement and deformation of the customs building were *** discrete element method(DEM)was then used to qualitatively analyze the relations between the grouting parameters and the ground *** results demonstrated that the poor dewatering work in the early stages increased the difficulty of *** grouting materials with high viscosity and large grouting pressure were required for water blocking because of the large amount of confined water in the tunnel,resulting in fracture *** ground was then uplifted due to the large inflow of the slurry and the excess pore water ***,the lessons learned from this incident were *** presented case study provides a reference for tunnel construction in urban areas with water-rich strata.

关键词： Grouting Ground heave Building damage Field test Numerical simulation

Shaking table test study on performance and functionality of a typical telecommunication room after earthquakes

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 455-474页

作者： Li Bo Guo Endong Sun Guoliang Ji Shuqiang Mao chenxi Wang Tao han Di Li Xiaofei Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China China Academy of Information and Communications Technology Beijing 100191China School of Architecture Engineering Binzhou UniversityBinzhou 256600China

Large numbers of basic transceiver stations,where the telecommunication room is one of the main components,comprise an important part of the telecommunication *** earthquakes,considerable economic loss from telecommunication systems is often associated with seismic damage and functional loss of the telecommunication ***,research related to this has been *** this study,shaking table tests were conducted for a full-scale typical telecommunication room,including a light-steel house and the necessary communication and power supply *** tests not only focused on the seismic damage to all the structures but also considered the functions of the communication and power supply of the *** interactions between these facilities and their effects on communication function were also *** with the damage to structures,the interruption of the power supply due to earthquakes is a weak ***,the damage indexes,together with their threshold values of different damage states for the communication and power supply equipment,were derived from the test *** results of this research can contribute to the literature gaps regarding seismic performance studies of telecommunication rooms,and can serve as a valuable reference for future research on its seismic fragility and economic losses evaluation.

关键词： telecommunication light-steel house communication equipment power supply equipment seismic performance functionality

Multi-model ensemble forecasting of 10-m wind speed over eastern China based on machine learning optimization

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Atmospheric and Oceanic Science Letters 2023年第5期16卷 95-101页

作者： Ting Lei Jingjing Min Chao han Chen Qi chenxi Jin Shuanglin Li Beijing Meteorological Service Center BejingChina Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBejingChin Department of Atmospheric Science China University of GeosciencesWuhanChina

风对人类活动和电力运行有重大影响,准确预报短期风速具有深远的社会和经济意义.基于中国东部100个站点,本研究首先评估了5个业务模式对10米风速的预报能力,日本气象厅JMA模式在减少预报误差方面表现最好.进一步,利用5种数值模式和多种... 详细信息

风对人类活动和电力运行有重大影响,准确预报短期风速具有深远的社会和经济意义.基于中国东部100个站点,本研究首先评估了5个业务模式对10米风速的预报能力,日本气象厅JMA模式在减少预报误差方面表现最好.进一步,利用5种数值模式和多种机器学习方法,将动力和统计相结合,对每个站点分别进行了特征工程和机器学习算法优选,建立了10米风速多模式集成预报模型。针对24至96小时预报时长,将该方法的预报性能与基于岭回归的多模式集成和JMA单模式进行比较.结果表明,基于机器学习优选的多模型集成方法可以将JMA模式的预报误差降低39%以上,预报效果的提升在11月最明显.此外,该方法优于基于岭回归的多模式集成方法.

关键词：风速机器学习优选集成预报岭回归

A 56 Gb/s DAC-DSP-based transmitter with adaptive retiming clock optimization using inverse-PR-based PD achieving 8-UI converge time in 28-nm CMOS

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Science China(Information Sciences) 2024年第8期67卷 347-348页

作者： Shubin LIU chenxi han Xiaoteng ZHAO Yuhao ZhanG Shixin LI Hongzhi LIANG Lihong YANG Zhangming ZHU Key Laboratory of Analog Integrated Circuits and Systems (Ministry of Education) School of Integrated CircuitsXidian University

With the growing demand for communication bandwidth,transmitters(TXs) are operating at higher rates, compressing the timing margin for the last 4:1 or 2:1 multiplexer(MUX). To alleviate the timing constraints, the retimer is introduced before the last-stage MUX. However, owing to process, voltage, and temperature(PVT) variations, the phase relationship between the retiming clock and the input data is uncertain, leading to insufficient setup and hold time for the successive retimer.

关键词： CMOS integrated circuits

Single-fundamental-mode cryogenic(3.6 K)850-nm oxideconfined VCSEL

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Journal of Semiconductors 2024年第10期45卷 69-73页

作者： Anjin Liu chenxi Hao Jingyu Huo Hailong han Minglu Wang Bao Tang Lingyun Li Lixing You Wanhua Zheng Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Key Laboratory of Superconductor Integrated Circuit Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Accelink technologies co. LtdWuhan 430205China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Cryogenic oxide-confined vertical-cavity surface-emitting laser(VCSEL)has promising application in cryogenic optical interconnect for cryogenic *** this paper,we demonstrate a cryogenic 850-nm oxide-confined VCSEL at around 4 *** cryogenic VCSEL with an optical oxide aperture of 6.5μm in diameter can operate in single fundamental mode with a side-mode suppression-ratio of 36 dB at 3.6 K,and the fiber-coupled output power reaches 1 mW at 5 *** small signal modulation measurements at 298 and 292 K show the fabricated VCSEL has the potential to achieve a high modulation bandwidth at cryogenic temperature.

关键词： VCSEL cryogenic temperature cryogenic computing optical interconnect

Preparation of carbon nanotube-reinforced polyethylene nanocomposites with better antiscaling and corrosion-resistant properties

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Industrial Chemistry & Materials

Industrial Chemistry & Materials 2024年第1期2卷 154-164页

作者： Binbin Sun Qian Liu Yuxin Gao Liang han Rui Zhang chenxi Zhang Xilai Jia Daqing Petrochemical Research Center DaqingHeilongjiang 163714China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Anti-scaling technology for pipelines has always been a focus of oilfield industrial *** with traditional metal pipes,polyethylene(PE)pipes have unique advantages in terms of corrosion resistance,surface friction resistance,and service *** this paper,aiming at an enhancement of antiscaling and corrosion-resistant properties,as well as increased mechanical properties,PE nanocomposites have been prepared by the introduction of modified carbon nanotubes(m-CNTs)into the PE *** improve the interface compatibility of the composites,the CNTs were treated with reactive tetrabutyl titanate after nitric acid oxidation,which brings about uniform dispersion of the CNTs and intimate interface *** the m-CNT fraction increases,the PE crystallinity displays a slight *** microscopy shows that the scaling on the surface of the composite material is obviously reduced compared with pure PE,because the surface free energy of the composite material ***,due to the good dispersion,the composites show enhanced mechanical *** is,by adding 1.10 wt%CNTs,the tensile stress and impact toughness of the composites are 20.76 MPa and 37.89 kJ m^(-2),respectively,increases of 15.0% and 11.9% compared with pure *** paper supports the idea that the crystallinity of the PE matrix can be improved by adding CNTs,thereby increasing the corrosion resistance and anti-scaling *** work can provide inspiration for using the methods of scale inhibition and corrosion resistance in polymer nanocomposites.

关键词： Carbon nanotube Nanocomposite Polyethylene Anti-scaling Corrosion-resistant