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A review on pavement distress and structural defects detection and quantification technologies using imaging approaches

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第2期9卷 135-150页

作者： chu chu Linbing Wang Haocheng Xiong National center for Materials service safety University of Science and Technology BeijingBeijing 100083China Department of civil&Environmental Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA school of civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

Pavement distress detection(PDD)plays a vital role in planning timely pavement maintenance that improves pavement service *** order to promote the development of PDD technologies and find out the insufficiencies in PDD field,this paper reviews the technical development history and characteristics of various PDD technologies,which contributes to the current state of research on ***,processes of PDD are briefly *** PDD technologies based on radar ranging,2D image,laser ranging and 3 D structured light are *** newest 3D PDD technology based on interference fringe,which has better accuracy,is in *** principles and implementation processes of these methods are ***,the shortcomings of these technologies in the field of PDD are *** for future development are *** research results show that various PDD technologies have been continuously improved,developed,over the past decade,and have achieved a series of ***,the measurements from existing PDD technologies can not be metrological traced to acquire the true dimensions of pavement *** lack of metrological traceability technology in the PDD field needs to be further *** order to achieve more accurate and efficient PDD,the metrological traceability technology of PDD systems has become the future development direction in this field.

关键词： Pavement service life Pavement distress detection Metrological traceability Development direction

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continuous high-efficient water-electricity cogeneration over a hybrid solar-driven water evaporation system and the working mechanism

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science china Materials 2024年第7期67卷 2371-2372页

作者： Dewei chu school of Materials science and Engineering University of New South WalesSydneyNSW 2052Australia

With the escalation of industrialization and population growth,energy and clean water shortages pose an unprecedented threat to sustainable ***,it is imperative to develop green and effective strategies to address these *** this context,solar-driven interfacial water evaporation(sIWE)has emerged as a highly promising low-carbon solution to the water-energy nexus[1].By locating the evaporator at airwater interfaces,heat localization can be achieved,leading to high-efficient water evaporation and freshwater *** significantly,taking advantage of the special conditions during sIWE has opened numerous opportunities for generation of extra electrical power[2,3].Throughout the processes of sIWE,various elements such as photons,waves,capillary flow,evaporation,vapor motions,condensation,and droplet sliding can all be harnessed to produce electricity through photovoltaic,thermoelectric,thermogalvanic,pyroelectric,piezoelectric,triboelectricity and hydrovoltaic effects[3].Extensive research efforts have provided valuable insights for the development of water-electricity cogeneration(WEG)hybrid systems.

关键词： mechanism evaporation piezoelectric

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south　china　sea　Warm　Pool　in　Boreal　spring

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Advances in Atmospheric sciences 1997年第2期14卷 72-83页

作者： Peter c. chu c. P. chang Naval Postgraduate school Monterey USA

During the boreal spring of 1966, a warm-core eddy is identified in the upper south china sea (scs) west of the Philippines through an analysis of the U.s. Navy′s Master Oceanographic Observation Data set. This eddy occurred before the development of the northern summer monsoon and disappeared afterward. We propose that this eddy is a result of the radiative warming during spring and the downwelling due to the anticyclonic forcing at the surface. Our hypothesis suggests an air-sea feedback scenario that may explain the development and withdrawal of the summer monsoon over the scs. The development phase of the warm-core eddy in this hypothesis is tested by using the Princeton Ocean model.

关键词： Warm-core eddy summer monsoon Downwelling south china sea

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A new biomimicry marine current turbine: study of hydrodynamic performance and wake using software OpenFOAM

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Journal of Hydrodynamics 2016年第1期28卷 125-141页

作者： Yung-Jeh chu Department of civil Engineering Faculty of Engineering University of Malaya

Inspired by Dryobalanops aromatica seed, a new biomimicry marine current turbine is proposed. Hydrodynamic performance and wake properties are two key factors determining whether a new marine current turbine design is practical or not. Thus, a study of hydrodynamic performance and wake of the proposed biomimicry turbine is conducted. The computational fluid dynamics（cFD） software, Open FOAM is used to generate the required results for the mentioned study. The hydrodynamic performance and wake properties of the proposed biomimicry turbine is compared to two conventional turbines of Bahaj et al. and Pinon et al. respectively. The simulation results showed that the proposed biomimicry marine current turbine gives optimum power output with its power coefficient, 0.376 Pc ≈ at the tip speed ratio（TsR） of 1.5. Under the same boundary conditions, the maximum torque produced by the proposed biomimicry turbine at zero rotational speed is 38.71 Nm which is 1110% greater than the torque generated by the turbine of Bahaj et al.. The recovery distance for the wake of the biomimicry turbine is predicted to be 10.6% shorter than that of IFREMER-LOMc turbine. The above-mentioned results confirm the potential application of the proposed biomimicry marine current turbine in the renewable energy industry.

关键词： marine current turbine wake biomimicry computational fluid dynamics(cFD) Open FOAM

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Argo floats revealing bimodality of large-scale mid-depth circulation in the North Atlantic

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Acta Oceanologica sinica 2008年第2期27卷 1-10页

作者： chu Peter c IVANOV Leonid M MELNIcHENKO Oleg V LI Rongfeng Department of Oceanography Naval Postgraduate School Monterey California USA International Pacific Research center University of Hawaii at Manoa Hawaii USA Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Analysis of Argo float trajectories at 1 000 m and temperature at 950 m in the North Atlantic between November 2003 and January 2005 demonstrates the existence of two different circulation modes with fast transition between them. Each mode has a pair of cyclonic - anticyclonic gyres. The difference is the location of the cyclonic gyre. The cyclonic gyre stretches from southeast to northwest in the first mode and from the southwest to the northeast in the second mode. The observed modes strongly affect the heat and salt transport in the North Atlantic. In particular, the second mode slows down the westward transport of the warm and saline water from the Mediterranean sea.

关键词： Argo trajectory data Atlantic Ocean biomodality mid-depth circulation optimal spectral decomposition

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POLYNOMIAL DYNAMIc PROGRAMMING ALGORITHMs FOR LOT sIZING MODELs WITH BOUNDED INVENTORY AND sTOcKOUT AND/OR BAcKLOGGING

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Journal of systems science and systems Engineering 2016年第3期25卷 370-397页

作者： Jinhong Zhong Feng chu chengbin chu shanlin Yang school of Management Hefei University of Technology Hefei 230009 China Laboratoire IBIsc Universite d'Evry-Val d'Essone France Laboratoire Genie Industriel Ecole Centrale Paris France Key Laboratory of Process Optimization and Intelligent Decision-making of Ministry of Education Hefei China

This paper addresses a dynamic lot sizing problem with bounded inventory and stockout where both no backlogging and backlogging allowed cases are considered. The stockout option means that there is outsourcing in a period only when the inventory level at that period is non-positive. The production capacity is unlimited and production cost functions are linear but with fixed charges. The problem is that of satisfying all demands in the planning horizon at minimal total cost. We show that the no backlogging case can be solved in O（T^2） time with general concave inventory holding and outsourcing cost functions where T is the length of the planning horizon. The complexity can be reduced to O（T） when the inventory holding cost functions are also linear and have some realistic properties, even if the outsourcing cost functions remain general concave functions. When the inventory holding and outsourcing cost functions are linear, the backlogging case can be solved in O（ T^3 logT） time whether the outsourcing level at each period is bounded by the sum of the demand of that period and backlogging level from previous periods, or only by the demand of that period.

关键词： Dynamic lot sizing problem bounded inventory outsourcing backlogging stockout,dynamic programming

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Efficient photocatalytic reduction of cO2 to formate by a molecular noble metal-free system

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science china chemistry 2025年第1期 152-156页

作者： Lihua Zhang Lingjing chen Huatian shi Yue Wei Gui chen Tai-chu Lau school of Environment and civil Engineering Research Center for Eco-environmental Engineering Dongguan University of Technology Department of chemistry and Institute of Molecular Functional Materials City University of Hong Kong

Reducing cO2to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting cO2to a specific product beyond cO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce cO2to formate （HcOO-）.Turnover number （TON） for HcOO-up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole （BIH） as sacrificial reductant in a cO2-saturated NMP/TEA （v/v,3:1） solution under visible light *** potential electrolysis at-1.41 V （***/Ag cl） in the presence of 12 m M Et3NHBF4also produced HcOO-with Faradaic efficiency of 39%.spectroscopic and electrochemical studies suggest that a[coI-H]species is the key intermediate for cO2reduction.

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Lifts of Non-compact convex sets and cone Factorizations

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Journal of systems science & complexity 2020年第5期33卷 1632-1655页

作者： WANG chu ZHI Lihong Beijing Jinghang computation and communication Research Institute Beijing 100074China KLMM Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China University of chinese Academy of sciences Beijing 100049China

This paper generalizes the factorization theorem of Gouveia,Parrilo and Thomas to a broader class of convex *** a general convex set,the authors define a slack operator associated to the set and its polar according to whether the convex set is full dimensional,whether it is a translated cone and whether it contains *** authors strengthen the condition of a cone lift by requiring not only the convex set is the image of an affine slice of a given closed convex cone,but also its recession cone is the image of the linear slice of the closed convex *** authors show that the generalized lift of a convex set can also be characterized by the cone factorization of a properly defined slack operator.

关键词： cone factorization convex set lift nonnegative rank polyhedron positive semidefinite rank recession cone

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Electrodes for Li-ion batteries: From high-voltage LicoO_(2) to coreduced /co-free layered oxides with potential anodes

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Nano Research 2023年第12期16卷 12983-13007页

作者： Luting song Weiguo chu Nanofabrication Laboratory National Center for Nanoscience and TechnologyBeijing 100190China center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Li-ion batteries(LIBs)are one type of more and more widely used devices for energy storage and power supply in which cathode materials are playing a relatively more decisive role at current *** this review,we start with pioneeringly commercialized R¯3mLicoO_(2)(LcO)with a layered rhombohedral structure(space group)to discuss novel sequentially emerging LcO-derived layered oxides from the perspectives of both cobalt content reduction and performance *** is placed on the improvement of high-voltage performance of LcO and co-reduced/free layered oxides,including co-reduced high-nickel layered oxides,co-free Li-rich layered oxides,and Ni-based layered oxides cathodes,and their underlying mechanisms via different ***,possibly matched carbon and silicon-based anode materials are briefly *** common issues and prospects of the layered oxides cathodes and their potential anodes are summarized and commented *** review can help understand the emergence logics of novel layered oxides with gradually vanishing cobalt involved,provide insights about the underlying mechanisms of performance enhancement pertaining to particular strategies,and even inspire the discovery of novel cathode materials with high performance and low cost.

关键词： Li-ion batteries cathodic materials anode materials high-voltage LicoO_(2) co-reduced/free layered oxides

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Validation of an improved two-fluid model with particle rotation for gas-solid fluidized bed

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Particuology 2023年第10期81卷 149-161页

作者： Lian Wang Xihua chu school of civil Engineering Wuhan UniversityWuhan430072HubeiChina

Gas-solid fluidized beds are widely applied in chemical and process *** is of significance to establish a reasonable and effective mathematical model to explore the hydrodynamics of gas-particle system for industrial *** a less computationally demanding alternative to the discrete descriptions,two-fluid model considering kinetic theory of granular flow is often adopted to describe the fluidized behaviors of particles,but it cannot characterize the rotation of particles and its influence on the fluidized *** this study,to address the rotation effect of the fluidized particles,a two-fluid model combining the classical fluid and micropolar fluid is established,namely *** the cMTFM,classical fluid is used to describe the motion of gas phase,while micropolar fluid is adopted to describe the motion of particle phase,and the rotation of particles and its influence on the hydrodynamics of the gas-particle system are characterized by the degree of freedom of microrotation and the improved drag force based on micropolar *** the calculation of the gas-solid bubbling fluidized bed,we investigated the influence of the microstructure parameters,particle-particle collision restitution coefficient and inlet velocity,and the results are compared to those from TFM model and *** the analysis,it manifests that pressure drop and expansion height of the fluidized bed under the consideration of the microrotation effect are closer to the experiments,which demonstrates the feasibility and advantage of the classical-micropolar two-fluid model.

关键词： Gas-solid fluidized bed Two-fluid model Micropolar fluid Microstructure parameter Fluidized behaviors

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