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Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

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Structural durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-Jun Zhang Wen-Wei Wang Jing-Shui Zhen Bo-Cheng Li De-Cheng Cai yang-yang du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model

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Conditions for void formation in friction stir welding from machine learning

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npj Computational Materials 2019年第1期5卷 554-561页

作者： yang du Tuhin Mukherjee Tarasankar DebRoy Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China

Friction stir welded joints often contain voids that are detrimental to their mechanical *** we investigate the conditions for void formation using a decision tree and a Bayesian neural *** types of input data sets including unprocessed welding parameters and computed variables using an analytical and a numerical model of friction stir welding were *** hundred and eight sets of independent experimental data on void formation for the friction stir welding of three aluminum alloys,AA2024,AA2219,and AA6061,were *** neural network-based analysis with welding parameters,specimen and tool geometries,and material properties as input predicted void formation with 83.3% *** the potential causative variables,i.e.,temperature,strain rate,torque,and maximum shear stress on the tool pin were computed from an approximate analytical model of friction stir welding,90 and 93.3%accuracies of prediction were obtained using the decision tree and the neural network,*** the same causative variables were computed from a rigorous numerical model,both the neural network and the decision tree predicted void formation with 96.6% *** these four causative variables,the temperature and maximum shear stress showed the maximum influence on void formation.

关键词： welding friction welded

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Improved Lossless Data Hiding for JPEG Images Based on Histogram Modification

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Computers, Materials & Continua 2018年第6期55卷 495-507页

作者： yang du Zhaoxia Yin Xinpeng Zhang Key Laboratory of Intelligent Computing&Signal Processing Ministry of EducationAnhui UniversityHefei230601P.R.China Department of Computer Science Purdue UniversityWest lafayette47906USA School of Communication and Information Engineering Shanghai UniversityShanghai 200072P.R.China

This paper proposes a lossless and high payload data hiding scheme for JPEG images by histogram *** most in JPEG bitstream consists of a sequence of VLCs(variable length codes)and the appended *** VLC has a corresponding RLV(run/length value)to record the AC/DC *** achieve lossless data hiding with high payload,we shift the histogram of VLCs and modify the DHT segment to embed *** we sort the histogram of VLCs in descending order,the filesize expansion is *** paper’s key contribution includes:Lossless data hiding,less filesize expansion in identical pay-load and higher embedding efficiency.

关键词： Lossless data hiding histogram VLC JPEG.

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Superior printed parts using history and augmented machine learning

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npj Computational Materials 2022年第1期8卷 1736-1745页

作者： Meng Jiang Tuhin Mukherjee yang du Tarasankar DebRoy State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Machine learning algorithms are a natural fit for printing fully dense superior metallic parts since 3D printing embodies digital technology like no other manufacturing *** traditional machine learning needs a large volume of reliable historical data to optimize many printing variables,the algorithm is augmented with human intelligence derived from the rich knowledge base of metallurgy and physics-based *** augmentation improves the computational efficiency and makes the problem tractable by enabling the algorithm to use a small set of *** provide a verifiable quantitative index for achieving fully dense superior parts,facilitate material selection,uncover the hierarchy of important variables that affect the density,and present easy-to-use visual process *** findings can improve the quality consistency of 3D printed parts that now limit their greater industrial *** approach used here can be applied to solve other problems of 3D printing and beyond.

关键词： printing augmented consistency

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Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第8期8卷 1191-1198页

作者： ZUO Dong-hong du Xu yang Zong-kai Department of Electronics and Information Engineering Huazhong Univerisity of Science and Technology Wuhan 430074 China

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.

关键词： Ad hoc networks Media streaming distribution Search algorithms Peer to peer (P2P)

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Do the Recent Labor Market Changes Negatively Affect Schooling?

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China & World Economy 2013年第2期21卷 38-55页

作者： yang du Institute of Population and Labor Economics Chinese Academy of Social Sciences

The Chinese labor market has transitioned from a dual labor market to a neoclassical labor market. With wages increasing for skilled workers, the impact on schooling must be considered by policy-makers. Taking advantage of national representative data for 2005 and 2010, the present paper examines the hypothesis that increasing opportunity costs reduce children＇s schooling. The empirical result is of particular relevance to poor areas, where people tend to have high discount rates and place more value on real time income. Although the total public investment in education has been increasing, our findings suggest that targeting relevant regions and compensating opportunity costs will improve the efficiency of education investments.

关键词： human capital labor market changes schooling decision

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Novel method for ambiguity elimination in the LFMCW radar

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Journal of Systems Engineering and Electronics 2006年第1期17卷 91-95页

作者： du Yuming yang Jianyu Xiong Jintao Coll. of Electronic Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

Aimed at solving the distance and vetocity decoupling problems of a moving target in LFMCW radar signal processing, a multiple repetition frequency waveform is adopted and a Doppler frequency duster algorithm is proposed, which is capable of recovering true velocity form the coupled velocity estimation directly. For the resolution of multiple targets, a match algorithm based on mean square error is also proposed. The combination of the above two methods realizes distance and velocity decoupling of multiple moving targets. The result of simulation verifies the effectiveness of the methods, the velocity estimation performance of DFS algorithm is improved by 2.5 dB compared with Chinese remiander theorem.

关键词： LFMCW radar Doppler frequency cluster resolution of multiple targets

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Zero Extension Problem for the Heat Equation

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Acta Mathematica Sinica,English Series 2022年第11期38卷 1981-1997页

作者： Ge yang du Qiang XU Shu Lin ZHOU School of Mathematical Sciences Peking UniversityBeijing 100871P.R.China School of Mathematics and Statistics Lanzhou UniversityLanzhou 730000P.R.China LMAM School of Mathematical SciencesPeking UniversityBeijing 100871P.R.China

In this paper we present a necessary and sufficient condition to guarantee that the zeroextended function of the solution for the heat equation in a smaller cylinder is still the solution of the corresponding extension problem in a larger *** prove the results under the frameworks of classical solutions,strong solutions and weak ***,we generalize these results to uniformly parabolic equations of divergence form.

关键词： Heat equation zero extension initial-boundary value problem

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Effects of lithium chloride on outward potassium currents in acutely isolated hippocam-pal CA1 pyramidal neurons

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Chinese Science Bulletin 2006年第16期51卷 1961-1966页

作者： ZHANG Chaofeng du Huizhi yang Pin Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan 030006 China

Although lithium possesses neuropro- tective functions, the molecular mechanism underly- ing its actions has not been fully elucidated. In the present paper, the effects of lithium chloride on volt- age-dependent potassium currents in the CA1 py- ramidal neurons acutely isolated from rat hippocam- pus were studied using the whole-cell patch-clamp technique. Depolarizing test pulses activated two components of outward potassium currents: a rapidly activating and inactivating component, IA and a de- layed component, IK. Results showed that lithium chloride increased the amplitude of IA in a concentra- tion-dependent manner. Half enhancement concen- tration (EC50) was 22.80±5.45 μmol?L?1. Lithium chloride of 25 μmol?L?1 shifted the steady-state acti- vation curve and inactivation curve of IA to more negative potentials, but mainly affected the activation kinetics. The amplitude and the activation processes of IK were not affected by lithium chloride. The effects of lithium chloride on potassium channel appear to possess neuroprotective properties by Ca2+-lowing effects modulate neuronal excitability by activating IA in rat hippocampal neurons.

关键词：氯化锂 CA1神经原钾电流 patch-clamp技术海马

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Study on the Thermal Ignition of Gasoline-air Mixture in Underground Oil Depots based on Experiment and Numerical Simulation

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Journal of Thermal Science 2010年第2期19卷 173-181页

作者： Ou Yihong du yang Jiang Xingsheng Wang dong Liang Jianjun Department of Petroleum Supply Engineering in Logistic Engineering University Chongqing 401311China Logistic Engineering University of PLA.

The study on the special phenomenon,occurrence process and control mechanism of gasoline-air mixture thermal ignition in underground oil depots is of important academic and applied value for enriching scientific theories of explosion safety,developing protective technology against fire and decreasing the number of fire *** this paper,the research on thermal ignition process of gasoline-air mixture in model underground oil depots tunnel has been carried out by using experiment and numerical simulation *** calculation result has been demonstrated by the experiment *** five stages of thermal ignition course,which are slow oxidation stage,rapid oxidation stage,fire stage,flameout stage and quench stage,have been firstly defined and accurately *** to the magnitude order of concentration,the species have been divided into six categories,which lay the foundation for explosion-proof design based on the role of different *** influence of space scale on thermal ignition in small-scale space has been found,and the mechanism for not easy to fire is that the wall reflection causes the reflux of fluids and changes the distribution of heat and mass,so that the progress of chemical reactions in the whole space are also *** novel mathematical model on the basis of unification chemical kinetics and thermodynamics established in this paper provides supplementary means for the analysis of process and mechanism of thermal ignition.

关键词： underground oil depots gasoline-air mixture thermal ignition experiment numerical simulation

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