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Analytical model for predicting time-dependent lateral deformation of geosynthetics-reinforced soil walls with modular block facing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 711-725页

作者： Luqiang ding Chengzhi xiao Feilong Cui School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China

To date,few models are available in the literature to consider the creep behavior of geosynthetics when predicting the lateral deformation(d)of geosynthetics-reinforced soil(GRS)retaining *** this study,a general hyperbolic creep model was first introduced to describe the long-term deformation of geosynthetics,which is a function of elapsed time and two empirical parameters a and *** conventional creep tests with three different tensile loads(Pr)were conducted on two uniaxial geogrids to determine their creep behavior,as well as the a-Pr and b-Pr *** test results show that increasing Pr accelerates the development of creep deformation for both ***,a and b respectively show exponential and negatively linear relationships with Pr,which were confirmed by abundant experimental data available in other *** on the above creep model and relationships,an accurate and reliable analytical model was then proposed for predicting the time-dependent d of GRS walls with modular block facing,which was further validated using a relevant numerical investigation from the previous *** evaluation and comparison of the proposed model with six available prediction models were *** a parametric study was carried out to evaluate the effects of wall height,vertical spacing of geogrids,unit weight and internal friction angle of backfills,and factor of safety against pullout on d at the end of construction and 5 years *** findings show that the creep effect not only promotes d but also raises the elevation of the maximum d along the wall ***,the limitations and application prospects of the proposed model were discussed and analyzed.

关键词： Geosynthetics Creep behavior Geosynthetics-reinforced soil(GRS)walls Lateral deformation Analytical model

Ternary organic solar cells offer 14% power conversion efficiency

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Science Bulletin 2017年第23期62卷 1562-1564页

作者： Zuo xiao Xue Jia Liming ding Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and TechnologyBeijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Organic solar cells （OSCs） have advantages like light-weight, flexibility, colorfulness and solution processability [1 ]. The active layer of OSCs generally contains two organic semiconductors： an electron donor and an electron acceptor. The donor and acceptor make nanoscale phase separation to allow efficient exciton dissociation and also form a three-dimensional （3D） passage to rapidly transfer free charge carriers to respective electrodes.

关键词： Ternary organic solar cells power conversion efficiency

Hypothesis of Intracellular Signaling Based on the Cytoskeleton Network

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Chinese Physics Letters 1998年第11期15卷 849-850页

作者： TANG xiao-wei ding Ming-xiao Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 Department of Cell Biology and Genetics Peking UniversityBeijing 100871

In order to explain the direction,speed and specificity of cell signaling a dual pathway hypothesis is *** this hypothesis the physical pathway is coupled to the biochemical *** an example,the propagation of a mechani... 详细信息

关键词： hypothesis skeleton specificity

Accelerating Optimization Design of Bio-inspired Interlocking Structures with Machine Learning

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Acta Mechanica Solida Sinica 2023年第6期36卷 783-793页

作者： Zhongqiu ding Hong xiao Yugang Duan Ben Wang School of Mechanical Engineering State Key Lab for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710049China

Structural connections between components are often weak areas in engineering *** nature,many biological materials with remarkablemechanical performance possess flexible and creative *** this work,we propose a novel bioinspired interlocking tab considering both the geometry of the tab head and neck,and demonstrate a new approach to optimize the bio-inspired interlocking structures based on machine *** neural networks for different optimization objectives are developed and trained using a database of thousands of interlocking structures generated through finite element *** show that the proposed method is able to achieve accurate prediction of the mechanical response of any given interlocking *** optimized designs with different optimization objectives,such as strength,stiffness,and toughness,are obtained efficiently and *** optimum design predicted by machine learning is approximately 7.98 times stronger and 2.98 times tougher than the best design in the training set,which are validated through additive manufacturing and experimental *** machine learning-based optimization approach developed here can aid in the exploration of the intricate mechanism behind biological materials and the discovery of new material designs boasting orders of magnitude increase in computational efficacy over conventional methods.

关键词： Interlocking structure Performance prediction Additive manufacturing Artificial neural network Finite element analysis

A Quantum Tanimoto Coefficient Fidelity for Entanglement Measurement

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 439-450页

作者： Yangyang Zhao Fuyuan xiao Masayoshi Aritsugi Weiping ding the School of Big Data and Software Engineering Chongqing UniversityChongqing 401331China IEEE the Faculty of Advanced Science and Technology Kumamoto UniversityKumamoto 860-8555Japan the School of Information and Technology Nantong UniversityNantong 223019China

Fidelity plays an important role in quantum information processing,which provides a basic scale for comparing two quantum *** present,one of the most commonly used fidelities is Uhlmann-Jozsa(U-J)***,U-J fidelity needs to calculate the square root of the matrix,which is not trivial in the case of large or infinite density ***,U-J fidelity is a measure of overlap,which has limitations in some cases and cannot reflect the similarity between quantum states ***,a novel quantum fidelity measure called quantum Tanimoto coefficient(QTC)fidelity is proposed in this *** other existing fidelities,QTC fidelity not only considers the overlap between quantum states,but also takes into account the separation between quantum states for the first time,which leads to a better performance of ***,we discuss the properties of the proposed QTC *** fidelity is compared with some existing fidelities through specific examples,which reflects the effectiveness and advantages of QTC *** addition,based on the QTC fidelity,three discrimination coefficients d_(1)^(QTC),d_(2)^(QTC),and d_^(3)^(QTC)are defined to measure the difference between quantum *** is proved that the discrimination coefficient d_(3)^(QTC)is a true ***,we apply the proposed QTC fidelity-based discrimination coefficients to measure the entanglement of quantum states to show their practicability.

关键词： Distance measure entanglement measurement fidelity measure quantum Tanimoto coefficient(QTC) similarity measure uncertainty

Advances in photothermal conversion of carbon dioxide to solar fuels

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Journal of Energy Chemistry 2023年第8期83卷 62-78,I0004页

作者： Wa Gao Yinwen Li Dequan xiao ding Ma College of Bioscience and Resources Environment Beijing University of AgricultureBeijing 102206China College of Chemistry and Molecular Engineering and College of Engineering Peking UniversityBeijing 100871China Center for Integrative Materials Discovery Department of Chemistry and Chemical and Biomedical EngineeringUniversity of New HavenWest HavenCT 06516USA

Converting carbon dioxide(CO_(2)) into useful fuels or chemical feedstocks is important for achieving peak carbon emission and carbon ***,photothermal catalysis has been extensively studied and applied due to its advantages over traditional heat-driven *** this review,we focus on photothermal catalysis of thermodynamically uphill reactions that convert CO_(2)into value-added *** first introduce the fundamentals of photothermal catalysis for CO_(2)reduction,including the definition and classification of photothermal catalysis,followed by their photothermal conversion *** structure design of different types of photothermal catalysts is *** superior performance of photothermal catalytic conversion of CO_(2)is illustrated and discussed,including improved CO_(2)activation,tunable selectivity towards different solar fuel products,and resistance to sintering and ***,the perspectives and challenges in this cutting-edge field are presented with the aim of advancing understanding of the underlying mechanisms and inspiring rational design of photothermal catalysts for highly efficient solar-to-fuel conversion.

关键词： Solarenergy Photothermal catalysis CO_(2)reduction Catalyst design Performance improvement

Monitoring the spontaneous wetting process of hydrophobic microporous membrane assisted by alternating current impedance spectroscopy

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Chinese Journal of Chemical Engineering 2021年第11期34卷 96-102页

作者： Juntian xiao Qian Sun Liying Liu Zhongwei ding Beijing Key Laboratory of Membrane Science and Technology College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029China

In the process of membrane absorption,spontaneous wetting of hydrophobic microporous membrane causes membrane modification and increases membrane phase mass transfer resistance,which have attracted wide ***,due to the limitations of previous testing methods,the study of the spontaneous membrane wetting process is ***,we present a method for monitoring spontaneous membrane wetting by measuring its alternating current(AC)*** impedance tests of the PVDF flat membranes and hollow fiber membranes were conducted in a two-electrode *** results of equivalent circuit fitting indicate that the impedance value of the unwetted membrane is about 1.02×10^(10)Ω,which is close to the theoretical value of 1.4×10^(10)Ω,and this method can quantify the electrochemical impedance value of membranes with different degrees of spontaneous *** addition,a method of impedance test for real-time monitoring of spontaneous wetting was *** the experiment,the timeliness and continuity of this method are confirmed with exact judgment under different *** future work,the impedance data will be used to build model to predict the percentage of membrane wetting degree.

关键词： Alternating current impedance Spontaneous membrane wetting Hydrophobic membrane Dynamic monitoring

Data-driven optimal cooperative adaptive cruise control of heterogeneous vehicle platoons with unknown dynamics

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Science China(Information Sciences) 2020年第9期63卷 109-120页

作者： Xiulan SONG Feng ding Feng xiao Defeng HE College of Information Engineering Zhejiang University of Technology

This paper considers the cooperative adaptive cruise control(CACC) problem of heterogeneous vehicle platoons and proposes a data-driven optimal CACC approach for the heterogeneous platoon with unknown dynamics. To cope with the unknown dynamics of the vehicle CACC platoon system, the adaptive dynamic programming is used to design an online iteration policy for optimal CACC of the platoon. Using the predecessor-following topology, the CACC controllers are computed by employing the desired spacing errors, relative velocities, and accelerations of the vehicles. The stability of the closed-loop CACC system and the iteration algorithm are presented. Furthermore, the string stability of the platoon with the CACC system is established in terms of the acceleration transfer function between adjacent vehicles in frequent domain. Finally, the effectiveness of the proposed method is verified in two complex scenarios of varying speed cruise.

关键词： vehicle platoons cooperative adaptive cruise control optimal control data-driven control string stability

Theoretical Studies on Electronic Structures and Spectroscopy of Fluorescent Arylamino Fumaronitrile

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Chinese Journal of Chemical Physics 2008年第2期21卷 105-110页

作者： xiao-peng Chen Yu-qi ding Qi-wen Teng Department of Chemistry Zhejiang University Hangzhou 310027 China

A new series of fluorescent arylamino fumarinitrile derivatives was designed and optimized using density function theory at the B3LYP/6-31G^＊ level. Based on the optimized geometries, the electronic, fluorescent and 13C NMR spectra are calculated with INDO/CIS, CIS-ZINDO TD, and B3LYP/6-31G^＊ methods, respectively. Starting with the first of the series, the LUMO-HOMO energy gaps of the derivatives become wider and the fluorescent wavelengths and the main peaks in the electronic spectra are blue-shifted owing to the large steric effect of naphthyl rings. On the contrary, the energy gaps of the derivatives turn narrow, and the fluorescent wavelengths and the main peaks in the electronic spectra are red-shifted since hydroxyl groups improve the symmetry and extend the conjugation system. The chemical shifts of sp^2-C on the phenyl rings are moved upfield, while chemical shifts of carbon atoms on the cyano groups and those connected with the cyano groups are changed downfield in the presence of hydroxyl groups.

关键词： Arylamino fumaronitrile Fluorescence Energy gap B3LYP/6-31G^*