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Effect of Support Calcination Temperature on Ag Structure and Catalytic Activity for CO Oxidation

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Chemical Research in Chinese Universities 2016年第3期32卷 455-460页

作者： ZHANG Xiaodong DONG Han ZHAO Di wang Yin wang yangang CUI Lifeng Environment and Low-carbon Research Center School of Environment and Architecture University of Shanghai for Science and Technology Shanghai 200093 P. R. China

SiO2 with different nanostructures, namely hexagonal mesoporous silica（HMS）, and three unordered commercial silica, were used as supports to fabricate silver catalysts using an incipient wetness impregnation method. It was found that Ag/HMS catalyst showed a high catalytic activity. Next, the HMS support was calcined at different temperatures before impregnation of AgNO3. The effect of calcination temperature of HMS support was investigated in terms of structure and catalytic activity of Ag catalysts. The support and catalysts were characterized by N2 ad- sorption-desorption isotherms, Thermogravimetric-differential thermal analyzer, X-ray diffraction, Hz-temperature program reduction and transmission electron microscopy. The results showed that calcination of HMS at an appropriate temperature（750 ℃） before catalyst preparation would benefit the formation of highly dispersive small sized Ag particles on the HMS support and markedly enhance the catalytic activity of Ag/HMS catalyst toward CO oxidation.

关键词： Ag catalyst CO oxidation SiO2 Calcination Support

AIGC challenges and opportunities related to public safety:A case study of ChatGPT

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Journal of Safety Science and Resilience 2023年第4期4卷 329-339页

作者： Danhuai Guo Huixuan Chen Ruoling Wu yangang wang Spatial Intelligent Research Lab College of Information Science and TechnologyBeijing University of Chemical TechnologyBeijing100029China Computer Network Information Center Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Artificial intelligence generated content(AIGC)is a production method based on artificial intelligence(AI)technology that finds rules through data and automatically generates *** contrast to computational intelligence,generative AI,as exemplified by ChatGPT,exhibits characteristics that increasingly resemble human-level comprehension and creation *** paper provides a detailed technical framework and history of ChatGPT,followed by an examination of the challenges posed to political security,military security,economic security,cultural security,social security,ethical security,legal security,machine escape problems,and information ***,this paper discusses the potential opportunities that AIGC presents in the realms of politics,military,cybersecurity,society,and public safety education.

关键词： Generative artificial intelligence Artificial intelligence generated content ChatGPT Public safety Strong artificial intelligence

A new parallel framework of distributed SWAT calibration

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Journal of Arid Land 2015年第1期7卷 122-131页

作者： Qiang LI Xi CHEN Yi LUO ZhongHua LU yangang wang Supercomputing Center Chinese Academy of Sciences Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences University of Chinese Academy of Sciences

With the development of large-scale hydrologic modeling, computational efficiency is becoming more and more important. Rapid modeling and analysis are needed to deal with emergency environmental disasters. The Soil and Water Assessment Tool （SWAT） is a popular hydrologic model, which is less applied in large-scale watershed simulation because of its sequential characteristics. For improving the computational efficiency of the SWAT model, we present a new parallel processing solution for hydrologic cycle and calibration based on MPI （Message Passing Interface）. We partitioned sub-basins during the processes based on a load balancing method Then the calibration was parallelized using a master-slave scheme, in which different input parameters were allocated to different processes to run the hydrologic cycle and compute the function value. Because of the slow convergence and local optimization of the SCE-UA （Shuffled Complex Evolution-developed by University of Arizona） algorithm in SWAT calibration, a genetic algorithm （GA） is developed to optimize the calibration step. Then by dividing the default communicator into several sub-communicators, all the hydrologic cycles were par- allelized in their own sub-communicators to achieve further acceleration. In this paper the results show speedups for the hydrologic cycle calculations, as well as in the optimized calibration step. In the case study, we tested the parallel hydrologic cycle by four processes, and got a speedup of 3.06. In the calibration section, after applying the GA optimization, with 10 cores, we got a speed increase of 8.0 in our GA parallel framework compared with the GA sequential calibration, which is much better than the original SWAT calibration. After the sub-communicators added, this process was speeded up even further. The study demonstrated that the GA parallel framework with multi-sub-communicators is an effective and efficient solution for the hydrologists in large scale hydrology simulations.

关键词： parallel computing hydrologic model SWAT parameter optimization calibration

Design and numerical investigation of swirl recovery vanes for the Fokker 29 propeller

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Chinese Journal of Aeronautics 2014年第5期27卷 1128-1136页

作者： wang yangang Li Qingxi G.Eitelberg L.L.M.Veldhuis M.Kotsonis School of Power and Energy Northwestern Polytechnical University School of Aerospace Engineer Delft University of Technology German-Dutch Wind Tunnels

Swirl recovery vanes（SRVs） are a set of stationary vanes located downstream from a propeller, which may recover some of the residual swirl from the propeller, hoping for an improvement in both thrust and efficiency. The SRV concept design for a scaled version representing the Fokker 29 propeller is performed in this paper, which may give rise to a promotion in propulsive performance of this traditional propeller. Firstly the numerical strategy is validated from two aspects of global quantities and the local flow field of the propeller compared with experimental data, and then the exit flow together with the development of propeller wake is analyzed in *** kinds of SRV are designed with multiple circular airfoils. The numerical results show that the swirl behind the propeller is recovered significantly with Model V3, which is characterized by the highest solidity along spanwise, for various working conditions, and the combination of rotor and vane produced 5.76% extra thrust at the design point. However, a lower efficiency is observed asking for a better vane design and the choice of a working point. The vane position is studied which shows that there is an optimum range for higher thrust and efficiency.

关键词： Multiple circular airfoil Propellers Propulsion efficiency Swirl recovery vane Turboprop engine

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储气库井水泥环密封性失效试验研究

石油机械 2024年第6期52卷 78-85页

作者：赵春贺梦琦陈显学汪衍刚刘长环冯永存李晓蓉辽河油田(盘锦)储气库有限公司辽宁省盘锦市124000 中国石油大学(北京)油气资源与探测国家重点实验室

循环注采气会对储气库井水泥环产生周期性载荷作用,易导致水泥环密封失效。以H储气库井水泥环密封失效为背景,开展了水泥石循环加卸载及水泥石力学、孔渗测试,获得了水泥石循环加载后的微观结构CT形态,进行了全尺寸水泥环密封失效试验... 详细信息

循环注采气会对储气库井水泥环产生周期性载荷作用,易导致水泥环密封失效。以H储气库井水泥环密封失效为背景,开展了水泥石循环加卸载及水泥石力学、孔渗测试,获得了水泥石循环加载后的微观结构CT形态,进行了全尺寸水泥环密封失效试验。试验结果表明:经过30轮次循环加载后水泥石力学性能降低、气体渗透能力增加,但依然能有效阻止气体从水泥基质泄漏;循环加卸载会造成水泥石微观结构损伤进而产生累积塑性应变,循环轮次越多累积塑性应变越大;循环加卸载后,水泥石CT扫描形态显示,水泥石中出现微观结构损伤,水泥石微观损伤程度由两端至中心逐步减弱;全尺寸试验证实水泥环一界面脱粘形成微环隙,底部气体沿着微环隙上窜导致上部B环空带压,水泥环本体及二界面在各组测试压力下均未出现破坏,不建议现场在现有基础上继续提高储气压力。研究结果可指导H储气库注采参数优化设计,并为国内外类似储气库运行制度的合理制定提供参考。

关键词：储气库井水泥环循环载荷密封失效全尺寸试验

First Record and Redefinition of the Qingdao Population of Marine Ciliate Cardiostomatella vermiformis (Kahl, 1928) Corliss, 1960 (Protozoa, Ciliophora)

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Journal of Ocean University of China 2007年第4期6卷 387-392页

作者： wang yangang HU Xiaozhong LONG Hongan SONG Weibo Laboratory of Protozoology Ocean University of China Qingdao 266003 P. R. China

The living morphology and infraciliature of a marine ciliate, Cardiostomatella vermiformis isolated from a sand beach of the Jiaozhou Bay near Qingdao, China, were investigated by live observation, protargol and silver carbonate impregnation methods. Both the morphological and morphometric data largely agree with former records. Based on the data obtained, an improved diagnosis for Cardiostomatella vermiformis is supplied: Large marine Cardiostomatella with cylindrical body shape and several prolonged caudal cilia; cells in vivo about (90–500) μm×(30–120) μm; macronucleus beaded; single contractile vacuole caudally positioned; buccal apparatus conspicuously small, genus typical; three to six postoral kineties; 96-130 somatic kineties. This species is recorded for the first time in China.

关键词： morphology infraciliature Cardiostomatella vermiformis

Rational design of a bifunctional fluorescent probe for distinguishing Hcy/Cys from GSH with ideal properties

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Chinese Chemical Letters 2021年第3期32卷 1061-1065页

作者： Xiaojie Ren Lide Liao Zhaoguang Yang Haipu Li Xi Li yangang wang Yong Ye Xiangzhi Song College of Chemistry&Chemical Engineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Changsha 410083China College of Biological Chemical Science and Engineering Jiaxing UniversityJiaxing 314001China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

By pairing two fluoropho res according to their optical prope rties such as absorption spectral overlap and absorptivity,fluorescent quantum yield and emission spectral separation,a bifunctional fluorescent probe,TQBF-NBD,was rationally designed and synthesized to discriminatively sense Hcy/Cys and GSH with good selectivity and *** is noted that this probe could work under a single-wave length excitation and displayed a mega-large Stokes ***-NBD reacted with Hcy/Cys to give a mixed green-red fluorescence and displayed a red fluorescence upon the treatment with *** imaging of intracellular Hcy/Cys from GSH with the help of TQBF-NBD was realized in living cells and zebrafish.

关键词： Borate complex Red-emitting Mega-large stokes shift Fluorescent probe

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles

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Automotive Innovation 2020年第4期3卷 299-316页

作者： Bo Li Huang Kuo Xuehui wang Yiyi Chen yangang wang David Gerada Sean Worall Ian Stone Yuying Yan Faculty of Engineering University of NottinghamNottingham NG72RDUK Dynex Semiconductor Limited Doddington RoadLincoln LN63LFUK GKN Driveline Ltd Pentagon SAbingdon OX143PZUK

An overview of current thermal challenges in transport electrification is introduced in order to underpin the research developments and trends of recent thermal management ***,explorations of intelligent thermal management and control strategies prevail among car manufacturers in the context of climate change and global warming ***,major cutting-edge systematic approaches in electrified powertrain are summarized in the first *** particular,the important role of heating,ventilation and air-condition system(HVAC)is *** trends in developing efficient HVAC system for future electrified powertrain are *** electric machine efficiency is under spotlight which could be improved by introducing new thermal management techniques and strengthening the efforts of driveline *** demanded integration efforts are expected to provide better value per volume,or more power output/torque per unit with smaller form *** by demands,major thermal issues of high-power density machines are raised including the comprehensive understanding of thermal path,and multiphysics challenges are addressed whilst embedding power electronic semiconductors,non-isotropic electromagnetic materials and thermal insulation *** but not least,the present review has listed several typical cooling techniques such as liquid cooling jacket,impingement/spray cooling and immersion cooling that could be applied to facilitate the development of integrated electric machine,and a mechanic-electric-thermal holistic approach is suggested at early design ***,a brief summary of the emerging new cooling techniques is presented and the keys to a successful integration are concluded.

关键词： Thermal management Electrified powertrain Efficient cooling and heating Electric machine and control High power electronics

Cascaded Multilevel Inverter Based Power and Signal Multiplex Transmission for Electric Vehicles

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CES Transactions on Electrical Machines and Systems 2020年第2期4卷 123-129页

作者： Yixuan Zhang Guipeng Chen Yihua Hu Chao Gong yangang wang Department of Electronic Engineering University of YorkYork YO105DDU.K School of Aerospace Engineering Xiamen UniversityXiamen 361005China Dynex Semiconductor Ltd Lincoln LN63LFU.K

Power&signal multiplex transmission(P&SMT)is a technique that uses power electronic circuits for communication signal *** this paper,a three-phase cascaded multilevel inverter-based P&S MT system is *** proposed method can transmit communication signals without using a Controller Area Network bus,thereby reducing the wiring cost of the conventional electric vehicle(EV)communication *** designed system can achieve motor speed regulation and battery balance discharging for *** the combined pulse width modulation scheme and frequency shift keying method,both power and communication signals are transmitted successfully in a simulation model implemented in Matlab/*** evaluating the bit error rate of the transmitted signal,the maximum signal rate of the proposed system is determined as 600 bit/s.

关键词： Battery state of charge controller area network frequency shift keying motor speed control pulse width modulation three-phase DC-AC converter