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Investigation on Effects of Mooring Line Fractures and Connector Failures for A Hybrid Modular Floating Structure System

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China Ocean Engineering 2022年第6期36卷 880-893页

作者： LIU Ya-qiong REN Nian-xin OU jin-ping School of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China College of Civil Engineering and Architecture Hainan UniversityHaikou 570228China

The present work reports a Hybrid Modular Floating Structure(HMFS)system with typical malfunction *** effects of both fractured mooring lines and failed connectors on main hydrodynamic responses(mooring line tensions,module motions,connector loads and wave power production)of the HMFS system under typical sea con-ditions are comparatively *** results indicate that the mooring tension distribution,certain module motions(surge,sway and yaw)and connector loads(Mz)are significantly influenced by mooring line *** adjacent mooring line of the fractured line on the upstream side suffers the largest tension among the remaining mooring lines,and the case with two fractured mooring lines in the same group on the upstream side is the most dangerous among all cases of two-line failures in view of mooring line tensions,module motions and connector ***-fore,one emergency strategy with appropriate relaxation of a proper mooring line has been proposed and proved effective to reduce the risk of more progressive mooring line *** addition,connector failures substantially affect certain module motions(heave and pitch),certain connector loads(Fz and My)and wave power *** present work can be helpful and instructive for studies on malfunction conditions of modular floating structure(MFS)systems.

关键词： Hybrid Modular Floating Structure(HMFS)system mooring line fractures connector failures hydrodynamic responses emergency strategy

Regulation of the photogenerated carrier transfer process during photoelectrochemical water splitting:A review

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Green Energy & Environment 2021年第4期6卷 479-495页

作者： Yaping Zhang Yuyu Bu Lin Wang jin-ping Ao Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi'an710071China

Photoelectrochemical(PEC)water splitting is considered as an ideal technology to produce *** carrier migration is one of the most important roles in the whole process of PEC water *** includes bulk transfer inside of the photoelectrode and the exchange at the solid-liquid *** energy barriers during the migration process lead to the dramatic recombination of photogenerated hot carrier and the reducing of their redox ***,an applied bias voltage should be provided to overcome these energy barriers,which brings the additional loss of *** researches indicate that some methods for the regulation of photogenerated hot carrier,such as p-n junction,unique transfer nanochannel,tandem nanostructure and Z-Scheme transfer structure et al.,show great potential to achieve high-efficient PEC water overall splitting without any applied bias *** to now,many reviews have summarized and analyzed the methods to enhance the PEC or photocatalysis water splitting from the perspectives of materials,nanostructures and surface modification ***,few of them focus on the topic of photogenerated carrier transfer regulation,which is an important and urgent developing *** this reason,this review focuses on the regulation of photogenerated carriers generated by the photoelectrodes and summarizes different advanced methods for photogenerated carrier regulation developed in recent *** comments and outlooks are also provided at the end of this review.

关键词： PEC water Splitting Photogenerated carrier migration Charge transfer regulation Energy band engineering Solid-liquid interface modification

Germanium/silica ratio and trace element composition of Early Cambrian siliceous rocks in Keping:implications for the siliceous rocks'formation and paleoenvironment interpretations

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Acta Geochimica 2020年第6期39卷 797-810页

作者： Zixuan guan Shibiao Deng Peixian Liu Yiqiu jin Xingchun Cao MOE Key Laboratory od Orogenic Belts and Crustal Evolution School of Earth and Space SciencePeking UniversityBeijing 100871China Research Institute of Petroleum Exploration and Development CNPCBeijing 100083China

This study used the germanium/silica(Ge/Si)ratios,together with rare earth elements and other trace elements to infer the siliceous source and sedimentary environment of the siliceous rocks located at the bottom of Yuertusi Formation in Northwestern Tarim Basin,Keping,*** studies have shown that this siliceous rock stratum formed at the edge of the carbonate platform on the continental *** suggest that these siliceous rocks were formed by hydrothermal activity,but some still draw different *** the silicon source and depositional environment of these siliceous rocks would help us learn the processes of environmental changes and the causes of biological explosions during this *** value of germanium/silica ratios of these siliceous rocks is from 0.15 to 0.37 pmol/mol and much lower than above 10|imol/mol values in siliceous rocks that are known formed by hydrothermal *** samples are rich in HREE,which differ from hydrothermal siliceous rocks that are rich in *** samples lack hydrothermal related *** these features show that the source of these siliceous rocks'siliceous is not hydrothermal flu *** samples'Ce/Ce*range from 0.88 to 1,and Th/U ratios range from 0.01 to *** features suggest these siliceous rocks were formed in an anoxic *** all the evidence,we conclude that the siliceous rock stratum at the bottom of the Lower Cambrian Yuertusi Formation in northwest Tarim ***,was formed in anoxic seawater at the edge of the carbonate platform on the continental *** silicon source is seawater instead of hydrothermal fluid.

关键词： Siliceous rocks Trace elements Ge/Si ratio Tarim Basin

A batch microfabrication of a self-cleaning,ultradurable electrochemical sensor employing a BDD film for the online monitoring of free chlorine in tap water

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Microsystems & Nanoengineering 2022年第2期8卷 85-96页

作者： Jiawen Yin Wanlei Gao Weijian Yu Yihua guan Zhenyu Wang Qinghui jin Faculty of Electrical Engineering and Computer Science Ningbo University315211 NingboP.R.China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences200050 ShanghaiP.R.China

Free chlorine is one of the key water quality parameters in tap ***,a free chlorine sensor with the characteristics of batch processing,durability,antibiofouling/antiorganic passivation and in situ monitoring of free chlorine in tap water continues to be a challenging *** this paper,a novel silicon-based electrochemical sensor for free chlorine that can self-clean and be mass produced via microfabrication technique/MEMS(Micro-Electro-Mechanical System)is proposed.A liquid-conjugated Ag/AgCI reference electrode is fabricated,and electrochemically stable BDD/Pt is employed as the working/counter electrode to verify the effectiveness of the as-fabricated sensor for free chlorine *** sensor demonstrates an acceptable limit of detection(0.056 mg/L)and desirable linearity(R^(2)=0.998).Particularly,at a potential of+2.5 V,hydroxyl radicals are generated on the BBD electrode by electrolyzing water,which then remove the organic matter attached to the surface of the sensor though an electrochemical digestion *** performance of the fouled sensor recovers from 50.2 to 94.1%compared with the initial state after self-cleaning for 30 *** addition,by employing the MEMS technique,favorable response consistency and high reproducibility(RSDping a competitive device for the online monitoring of free chlorine in tap water.

关键词： chlorine batch electrode

Global identification of chemical constituents and rat metabolites of Si-Miao-Wan by liquid chromatography-electrospray ionization/ quadrupole time-of-flight mass spectrometry

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Chinese Journal of Natural Medicines 2017年第7期15卷 550-560页

作者： LU jin-jin HU Xue-Wen LI ping CHEN Jun State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China

Si-Miao-Wan(SMW), a tradiational Chinese medicinal formula consisting of Atractylodis Rhizoma, Phellodendri Chinensis Cortex, Coicis Semen, and Achyranthis Bidentatae Radix, has been used for the treatment of gout and gouty arthritis for many years. In the present study, a liquid chromatography quadrupole-time-of-flight mass spectrometry(LC-Q-TOF/MS) method was established to identify the multiple constituents of SMW and its metabolites in rat biological samples after oral administration. A total of 48 compounds in SMW, including 21 alkaloids, 12 organic acids, 2 terpenes, 3 lactones, 2 phytosterols, and 8 other compounds, were tentatively characterized with the diagnostic-ion filtering strategy. Based on the diagnostic ions applied to identify compounds in SMW, 28 prototype compounds and 10 metabolic compounds were detected in the biological samples. This was the first comprehensive drug metabolism investigation of SMW in rats. The developed method could be a useful means for identifying the multi-components in SMW and the metabolic components. The results may help explore the possible metabolic processes and mechanism of action for SMW in vivo.

关键词： Si-Miao-Wan LC-Q-TOF/MS Chemical constituents Metabolites

Adaptive Fuzzy Dynamic Surface Control for Uncertain Nonlinear Systems

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International Journal of Automation and computing 2009年第4期6卷 385-390页

作者： Xiao-Yuan Luo Zhi-Hao Zhu Xin-ping guan Institute of Electrical Engineering Yanshan University Qinhuangdao 066004 PRC

In this paper, a robust adaptive fuzzy dynamic surface control for a class of uncertain nonlinear systems is proposed. A novel adaptive fuzzy dynamic surface model is built to approximate the uncertain nonlinear functions by only one fuzzy logic system. The approximation capability of this model is proved and the model is implemented to solve the problem that too many approximators are used in the controller design of uncertain nonlinear systems. The shortage of ＂explosion of complexity＂ in backstepping design procedure is overcome by using the proposed dynamic surface control method. It is proved by constructing appropriate Lyapunov candidates that all signals of closed-loop systems are semi-globally uniformly ultimate bounded. Also, this novel controller stabilizes the states of uncertain nonlinear systems faster than the adaptive sliding mode controller （SMC）. Two simulation examples are provided to illustrate the effectiveness of the control approach proposed in this paper.

关键词： Uncertain nonlinear systems fuzzy logic system dynamic surface control backstepping design

Numerical study on ignition start-up process of an underwater solid rocket motor across a wide depth range

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Chinese Journal of Aeronautics 2024年第10期37卷 136-157页

作者： Deyou WANG Shipeng LI Ge jin Ruyao WANG Dian guan Ningfei WANG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Beijing System Design Institute of Electro-mechanic Engineering Beijing 100854China

Solid rocket motors have important applications in the propulsion of trans-media vehicles and underwater launched *** this paper,the ignition start-up process of an underwater solid rocket motor across a wide depth range has been numerically studied.A novel multi-domain integrated model has been developed by combining the solid propellant ignition and combustion model with the volume of fluid multiphase *** integrated model enables the coupled simulation of the propellant combustion and gas flow inside the motor,along with the gas jet evolution in the external water *** detailed flow field developments in the combustion chamber,nozzle,and wake field are carefully *** variation rules of the internal ballistics and thrust performance are also *** effects of environmental medium and operating depth on the ignition start-up process are systematically *** results show that the influence of the operating environment on the internal ballistic characteristics is primarily reflected in the initial period after the nozzle closure *** development of the gas jet in water lags significantly compared with that in *** the water depth increases,the ignition delay time of the motor is shortened,and the morphology evolution of the gas jet is significantly compressed and ***,the necking and bulging of the jet boundary near the nozzle outlet and the consequent shock oscillations are intensified,resulting in stronger fluctuations in the wake pressure field and motor thrust.

关键词： Underwater propulsion Solid rocket motor Ignition start-up process Underwater gas jet Thrust oscillation

New Inverse Method for Determining Uniaxial Flow Properties by Spherical Indentation Test

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 138-146页

作者： Guoyao Chen Xiaocheng Zhang Jiru Zhong jin Shi Qiongqi Wang Kaishu guan School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China

The spherical indentation test has been successfully applied to inversely derive the tensile properties of small regions in a non-destructive *** inverse methods mainly rely on extensive iterative calculations,which yield a considerable computational *** this paper,a database method is proposed to determine tensile flow properties from a single indentation force-depth curves to avoid iterative ***,a database that contain numerous indentation force-depth curves is established by inputting varied Ludwic material parameters into the indentation finite elements ***,for a given experimental indentation curve,a mean square error(MSE)is designated to evaluate the deviation between the experimental curve and each curve in the ***,the true stresses at a series of plastic strain can be acquired by analyzing these *** validate this new method,three different steels,i.e.A508,2.25Cr1 Mo and 316L are *** simulated indentation curves and experimental indentation curves are used as inputs of the database to inversely acquire the flow *** result indicates that the pro-posed approach provides impressive accuracy when simulated indentation curves are used,but is less accurate when experimental curves are *** new method can derive tensile properties in a much higher efficiency compared with traditional inverse method and are therefore more adaptive to engineering application.

关键词： Spherical indentation test Database method Uniaxial stress-strain relationship

One dimensional carbon-based composites as cathodes for lithium-sulfur battery

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Journal of Materials Science & Technology 2022年第27期122卷 101-120页

作者： jin Luo Keke guan Wen Lei Shaowei Zhang Quanli Jia Haijun Zhang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeter EX44QFUnited Kingdom Henan Key Laboratory of High Temperature Functional Ceramics Zhengzhou UniversityZhengzhou 450052China

Lithium-sulfur batteries(LSBs),owing to their much higher energy density compared to the traditional lithium-ion battery,are deemed as one of the most promising candidates for the energy storage ***,several issues including shuttle effect,lithium dendrites,and volumetric expansion seriously impede the commercial applications of ***-dimensional carbon materials(1DCMs)have been widely used as the matrix material for LSBs due to their high surface area,superior conductivity,good flexibility,excellent mechanical stability,and functional *** this review,the recent progress in 1D carbon-based composites as cathode including metal compounds/1DCMs,MOFs/1DCMs,MXenes/1DCMs,and polymers/1DCMs were *** strategies for polysulfide confinement and analysis of the functions of various components in the composites were summarized *** the end,the current challenges of LSBs were systematically summarized,and the future outlooks were proposed,aiming at providing a comprehensive insight into the design of new host materials for nextgeneration LSBs.

关键词： One-dimensional carbon materials Composites Lithium-sulfur batteries Cathode Suttle effect