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Catalytic wet air oxidation of phenol, nitrobenzene and aniline over the multi-walled carbon nanotubes （MWCNTs） as catalysts

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Frontiers of Environmental Science & Engineering 2015年第3期9卷 436-443页

作者： Shaoxia YANG Yu SUN Hongwei YANG Jiafeng WAN National Engineering Laboratory for Biomass Power Generation equipment School of Renewable Energy North China Electric Power University Beijing 102206 China School of Environment Tsinghua University Beijing 100084 China department of Environmental Science and Engineering Heilongjiang University Harbin 150080 China

Wet air oxidation （WAO） is one of effective technologies to eliminate hazardous, toxic and highly concentrated organic compounds in the wastewater. In the paper, multi-walled carbon nanotubes （MWCNTs）, functionalized by 03, were used as catalysts in the absence of any metals to investigate the catalytic activity in the catalytic wet air oxidation （CWAO） of phenol, nitrobenzene （NB） and aniline at the mild operating conditions （reaction temperature of 155℃ and total pressure of 2.5 MPa） in a batch reactor. The MWCNTs were characterized with scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, gas adsorption measurements （BET）, fourier transform infrared spectroscopy （FT-IR）, and X-ray photoelectron spectroscopy （XPS）. The functionalized MWCNTs showed good catalytic performance. In the CWAO of phenol over the functionalized MWCNTs, total phenol removal was obtained after 90 rain run, and the reaction apparent activation energy was ca. 40kJ · mol^-1. The NB was not removed in the CWAO of single NB, while ca. 97% NB removal was obtained and 40% NB removal was attributed to the catalytic activity after 180 min run in the presence of phenol. Ca. 49% aniline conversion was achieved after 120 min run in the CWAO of aniline.

关键词： catalytic wet nanotubes (CNTs) phenol air oxidation (CWAO) carbon nitrobenzene aniline

Editorial for the Special Issue on Intelligent Manufacturing

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Engineering 2021年第6期7卷 704-705页

作者： Peigen Li Andrew Kusiak Liang Gao Weiming Shen The State Key Laboratory of Digital Manufacturing equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China department of Industrial and Systems Engineering The University of IowaIowa CityIA 52242-1527USA

Intelligent manufacturing is the development trend of manufac-turing *** comprises the deep integration of new-genera-tion information and communication technologies(i.e.,fifth generation mobile networks(5G),artificial intelligence,the Indus-trial Internet,etc.)with advanced manufacturing technologies,covering the whole life cycle of a product,including design,pro-duction,logistics,services,and so *** it is largely based on automation and machine intelligence,humans play essential roles in intelligent manufacturing.

关键词： services Intelligent artificial

Pyrolysis of WEEE plastics using catalysts produced from fly ash of coal gasification

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Frontiers of Environmental Science & Engineering 2017年第5期11卷 113-123页

作者： Marika Benedetti Lorenzo Cafiero Doina De Angelis Alessandro Dell'Era Mauro Pasquali Stefano Stendardo Riceardo Tuffi Stefano Veechio Ciprioti department for Sustainability ENEA - Casaccia Research Center Via Anguillarese 301 S. Maria di Galeria Rome Italy department of SBAI Sapienza University of Rome Via del Castro Laurenziano 7 00161 Rome Italy department of Energy technologies ENEA Casaccia Research Center Via Anguillarese 301 S. Mafia di Galeria Rome Italy

Catalytic pyrolysis of thermoplastics extracted from waste electrical and electronic equipment （WEEE） was investigated using various fly ash-derived catalysts. The catalysts were prepared from fly ash by a simple method that basically includes a mechanical treatment followed by an acid or a basic activation. The synthesized catalysts were characterized using various analytical techniques. The results showed that not treated fly ash （FA） is characterized by good crystallinity, which in turn is lowered by mechanical and chemical treatment （fly ash after mechanical and acid activation, FAMA） and suppressed almost entirely down to let fly ash become completely amorphous （fly ash al^er mechanical and basic activation FAMB）. Simultaneously, the surface area resulted increased. Subsequently, FA, FAMB and FAMA were used in the pyrolysis of a WEEE plastic sample at 400~C and their performance were compared with thermal pyrolysis at the same temperature. The catalysts principally improve the light oil yield： from 59 wt.% with thermal pyrolysis to 83 wt.% using FAMB. The formation of styrene in the oil is also increased： from 243 mg/g with thermal pyrolysis to 453 mg/g using FAMB. As a result, FAMB proved to be the best catalyst, thus producing also the lowest and the highest amount of char and gas, respectively.

关键词： Waste electrical and electronic equipment(WEEE) plastic mixture Pyrolysis Catalyst Fly asla Oil

Virtual assembly framework for performance analysis of large optics

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Virtual Reality & Intelligent Hardware 2020年第1期2卷 28-42页

作者： Jinli ZHANG Hui WANG Bowu LIU Dongya CHU Xu XU Guoqing PEI Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China department of Mechanical Engineering State Key Laboratory of TribologyBeijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and ControlTsinghua UniversityBeijing 100084China

Background A longstanding technological challenge exists regarding the precise assembly design and performance optimization of large optics in high power laser facilities,comprising a combination of many complex problems involving mechanical,material,and laser beam *** In this study,an augmented virtual assembly framework based on a multiphysics analysis and digital simulation is presented for the assembly optimization of large *** framework focuses on the fundamental impact of the structural and assembly parameters of a product on its optical performance;three-dimensional simulation technologies improve the accuracy and measurability of the *** iterative computation algorithms have been developed to optimize the assembly plan of large optics,which are significantly affected by a series of constraints including dynamic loads and nonlinear ambient *** Finally,using a 410-mm-aperture frequency converter as the study case,we present a detailed illustration and discussion to validate the performance of the proposed system in large optics assembly and installation engineering.

关键词： Virtual assembly Multiphysics Simulation Large optics

Distance-controllable and direction-steerable opto-conveyor for targeting delivery

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Photonics Research 2020年第7期8卷 1124-1133页

作者： Zhen Che Wenguo Zhu Yaoming Huang Yu Zhang Linqing Zhuo Pengpeng Fan Zhibin Li Huadan Zheng Wenjin Long Wentao Qiu Yunhan Luo Jun Zhang Jinghua Ge Jianhui Yu Zhe Chen Key Laboratory of Optoelectronic Information and Sensing technologies of Guangdong Higher Education Institutes Guangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsJinan UniversityGuangzhou 510632China department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China department of Cell Biology Yale University School of MedicineNew HavenConnecticut 06510USA

Opto-conveyors have attracted widespread interest in various fields because of their non-invasive and non-contact delivery of micro/***,the flexible control of the delivery distance and the dynamic steering of the delivery direction,although very desirable in all-optical manipulation,have not yet been achieved by ***,using a simple and cost-effective scheme of an elliptically focused laser beam obliquely irradiated on a substrate,a direction-steerable and distance-controllable opto-conveyor for the targeting delivery of microparticles is ***,in the proposed scheme of the opto-conveyor,the transverse and longitudinal resultant forces of the optical gradient force and the optical scattering force result in the transverse confinement and the longitudinal transportation of microparticles,*** this study,it is experimentally shown that the proposed opto-conveyor is capable of realizing the targeting delivery for ***,the delivery distance of microparticles can be flexibly and precisely controlled by simply adjusting the irradiation *** simply rotating the cylindrical lens,the proposed opto-conveyor is capable of steering the delivery direction flexibly within a large range of azimuthal angles,from-75°to 75°.This study also successfully demonstrated the real-time dynamic steering of the delivery direction from-45°to 45°with the dynamical rotation of the cylindrical *** to its simplicity,flexibility,and controllability,the proposed method is capable of creating new opportunities in bioassays as well as in drug delivery.

关键词： simply cylindrical simplicity

HV isolated power supply system for complex multiple electrical potential equipment in 500􀯓kV hybrid DC breaker

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High Voltage 2020年第4期5卷 425-433页

作者： Xiangyu Zhang Zhanqing Yu Rong Zeng Meng Zhang Yuehuang Zhang Fengliang Xiao WeiLi department of Electrical Engineering Tsinghua UniversityBeijing 100084People's Republic of China Beijing Power equipment Group Co.Ltd. Beijing 102401People's Republic of China Shandong Taikai High Voltage Switchgear Co.Ltd. Tai'an 271000People's Republic of China

High-voltage direct current circuit breakers(HVDC CB)are one of the key technologies of multi-terminal DC systems and DC *** from other equipment that use a large number of power electronic devices,the HVDC CB cannot obtain its power from the primary system at high potential,making the power supply of the complex multiple electrical potential equipment in HVDC CB a *** this study,the authors propose an HV isolated power supply system based on the multi-output high-frequency isolated power supply unit and the cascaded isolation transformer *** power supply system can support the 500 kV CB to turn-off 25 kA current with 800 kV overvoltage.

关键词： power electrical system

Artificial intelligence-based predictive model of nanoscale friction using experimental data

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Friction 2021年第6期9卷 1726-1748页

作者： Marko PERČIĆ Saša ZELENIKA Igor MEZIĆ University of Rijeka Faculty of Engineering51000 RijekaCroatia University of Rijeka Centre for Micro-and Nanosciences and Technologies&Center for Artificial Intelligence and Cybersecurity51000 RijekaCroatia University of California Santa Barbara Department of Mechanical EngineeringSanta BarbaraCA 93105USA

A recent systematic experimental characterisation of technological thin films,based on elaborated design of experiments as well as probe calibration and correction procedures,allowed for the first time the determination of nanoscale friction under the concurrent influence of several process parameters,comprising normal forces,sliding velocities,and temperature,thus providing an indication of the intricate correlations induced by their interactions and mutual *** created the preconditions to undertake in this work an effort to model friction in the nanometric domain with the goal of overcoming the limitations of currently available models in ascertaining the effects of the physicochemical processes and phenomena involved in nanoscale *** to the stochastic nature of nanoscale friction and the relatively sparse available experimental data,meta-modelling tools fail,however,at predicting the factual *** on the acquired experimental data,data mining,incorporating various state-of-the-art machine learning(ML)numerical regression algorithms,is therefore *** results of the numerical analyses are assessed on an unseen test dataset via a comparative statistical *** is therefore shown that the black box ML methods provide effective predictions of the studied correlations with rather good accuracy levels,but the intrinsic nature of such algorithms prevents their usage in most practical *** programming-based artificial intelligence(AI)methods are consequently finally *** the marked complexity of the analysed phenomena and the inherent dispersion of the measurements,the developed AI-based symbolic regression models allow attaining an excellent predictive performance with the respective prediction accuracy,depending on the sample type,between 72%and 91%,allowing also to attain an extremely simple functional description of the multidimensional dependence of nanoscale friction on the studied variable process param

关键词： nanoscale friction thin films data mining machine learning(ML) predictive artificial intelligence(AI)-based model

Effect of die coating on surface crack depth of hot extruded 7075 aluminum alloy

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Friction 2023年第7期11卷 1212-1224页

作者： Tatsuya FUNAZUKA Kuniaki DOHDA Norio TAKATSUJI Chengliang HU Ngernbamrung SUKUNTHAKAN Faculty of Engineering University of ToyamaToyama 9308555Japan department of Mechanical Engineering Northwestern UniversityEvanston 60201USA Institute of Forming Technology&equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China Metal and Manufacturing Process Research Group National Metal and Materials Technology CenterPathumthani 12120Thailand

The aluminum alloys belonging to the 7000 series are high-strength alloys used in a wide variety of products for weight *** are primarily used in the field of transportation and *** these,the A7075 alloy has the highest strength and is expected to be applicable in a wide range of fields,such as aircraft components and sports ***,it has high deformation resistance and is prone to surface defects,which is called *** typically occurs at high temperatures and high ram speeds,and adversely affects *** localized melting of Zn and additive compounds,due to the heat generated during the process,is considered to cause *** this study,the effect of friction,heat,and tearing at the tool-metal interface was mitigated by improving the die surface *** reduced friction eliminated recrystallization by preventing the temperature from increasing to recrystallization *** addition,an AlCrN coating was adopted instead of nitriding to improve the die surface *** tearing size and heat generated when using the AlCrN coating were found to be ***,the grain size observed in the tearing region on the extruded surface was *** simulations using the shear friction coefficient m observed from friction tests indicate that the use of the AlCrN coating improved the material ***,the AlCrN coating is considered effective for reducing friction at the interface and preventing the recrystallization of the extruded *** the aforementioned results,it can be inferred that a die coating can reduce the tearing sensitivity and increase the productivity of the A7075 alloy.

关键词： hot extrusion 7075 aluminum alloy die coating tearing

Underwater minirobots actuated by hybrid driving method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第7期24卷 596-611页

作者： Xinghong YE Yang YANG Pengcheng JIAO Zhiguo HE Lingwei LI Institute of Port Coastal and Offshore EngineeringOcean CollegeZhejiang UniversityZhoushan 316021China Engineering Research Center of Oceanic Sensing Technology and equipment of Ministry of Education Zhejiang UniversityZhoushan 316021China department of Biomedical Engineering(BME) National University of SingaporeSingapore 119077Singapore Key Laboratory of Marine Geotechnical Engineering and Materials Zhoushan 316021China

Underwater minirobots have attracted significant interest due to their value in complex application *** underwater minirobots are driven mainly by a soft or rigid ***,soft actuation is currently facing challenges,including inadequate motional control accuracy and the lack of a continuous and steady driving force,while conventional rigid actuation has limited actuation efficiency,environmental adaptability,and motional flexibility,which severely limits the accomplishment of complicated underwater *** this study,we developed underwater minirobots actuated by a hybrid driving method(HDM)that combines combustion-based actuators and propeller thrusters to achieve accurate,fast,and flexible underwater locomotion *** experiments were conducted to investigate the kinematic performance of the minirobots with respect to the motion modes of rising,drifting,and *** models were used to investigate the kinematic characteristics of the minirobots,and theoretical models developed to unveil the mechanical principle that governs the driving *** agreement was obtained from comarisons of the experimental,numerical,and theoretical ***,the HDM was compared with selected hybrid driving technologies in terms of acceleration and response *** comparison showed that the minirobots based on HDM were generally superior in transient actuation ability and reliability.

关键词： Hybrid driving method(HDM) Underwater minirobots Operation reliability Transient actuation