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Structural Durability & Health Monitoring 2025年第1期19卷 55-75页

作者： Zhenyu zhang Quan Jin haitao zhang Zhao Liu Yuyang Wu Longfei zhang Renzhang Yan CCCC Third Highway Engineering Co. Ltd.Beijing101300China School of Civil Engineering Chongqing Jiaotong UniversityChongqing400074China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-filled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during construction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction ***,the optimal construction plan of concrete placement first and then prestress-tensioning is proposed.

关键词： Concrete panels freeze-thaw damage compression-shear crack tension-shear crack

Research and implementation of a universal workflow model to evaluate the soil fertility based on OGC Web Service

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Geo-Spatial Information Science 2018年第4期21卷 346-357页

作者： Yan Ren Jiaying Chen Lankang Chen haitao zhang Ke zhang Land Surveying and Mapping Institute of Guangxi Zhuang Autonomous Region NanningChina College of Resources and Environment Huazhong Agricultural UniversityWuhanChina

A method based on workflow technology and Open Geospatial Consortium(OGC)specification is proposed to establish a universal workflow conceptual model in the network *** this paper,the soil fertility evaluation conceptual model was developed as an evaluation method of soil fertility by analyzing the GIS-based fertility evaluation method and extracting the dynamic variable to verify the feasibility *** validation process involves determining the instantiation of the conceptual *** proposed conceptual model achieved the following *** data acquisition and processing functions were packaged into an OGC-compliant service model;these service models were organized into a processing chain in a certain order on the workflow platform by Petri-Net;the fertility evaluation was realized on the workflow platform by calling the processing *** showed that processing functions and data can be shared in the network environment,and the network workflow model can be realized by the workflow *** successful implementation of fertility evaluation proved the feasibility of the network-based universal workflow conceptual *** addition,the flexibility of our modeling method is demonstrated by reconstructing the workflow model.

关键词： OGC Web Service conceptual model workflow fertility evaluation

Effect of the operation parameters on the Fischer-Tropsch synthesis in fluidized bed reactors

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Chinese Journal of Chemical Engineering 2018年第2期26卷 245-251页

作者： Xiaolai zhang Weixin Qian haitao zhang Qiwen Sun Weiyong Ying Engineering Research Center of Large Scale Reactor Engineering and Technology Ministry of EducationState Key Laboratory of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Coal Liquefaction and Coal Chemical Technology Shanghai 201203China

For the Fischer-Tropsch synthesis （FrS）, this paper presents a numerical investigation in a 3D fiuidized bed reactor. The effect of the operation parameters such as bed temperature, superficial gas velocities, particle size and bed heights is discussed. A 3D-CFD model coupled with FTS chemical kinetics was set up. The computational resuits are compared with experimental data in terms of the components production rates, etc. The analysis shows that the bed heights, the bed temperature, the superficial gas velocities and particle sizes affect the C5 ＋ selectivity and the reaction rates. Product yields are dependent on the operating conditions especially the temperature.

关键词： Fluidized bed Fischer-Tropsch synthesis CFD

Component-adaptive up-sampling for inter layer interpolation in scalable video coding

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Science in China(Series F) 2009年第4期52卷 704-711页

作者： WANG zhang zhang JiXian LI haitao Institute of Photogrammetry and Remote Sensing Chinese Academy of Surveying and Mapping Beijing 100039 China

Scalable video coding （SVC） is a newly emerging standard to be finalized as an extension of H.264/AVC. The most attractive characters in SVC are the inter layer prediction techniques, such as Intra_BL mode. But in current SVC scheme, a uniform up-sampling filter （UUSF） is employed to magnify all components of an image, which will be very inefficient and result in a lot of redundant computational complexity. To overcome this, we propose an efficient component-adaptive up-sampling filter （CAUSF） for inter layer interpolation. In CAUSF, one character of human vision system is considered, and different up- sampling filters are assigned to different components. In particular, the six-tap FIR filter used in UUSF is kept and assigned for luminance component. But for chrominance components, a new four-tap FIR filter is used. Experimental results show that CAUSF maintains the performances of coded bit-rate and PSNR-Y without any noticeable loss, and provides significant reduction in computational complexity.

关键词： scalable video coding spatial interpolation up-sampling filter human vision system

A new composite material produced by semi-continuous casting

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Acta Metallurgica Sinica(English Letters) 2010年第4期23卷 255-260页

作者： Huixue JIANG Ke QIN haitao zhang Jianzhong CUI Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China

A new composite material consisting of lxxx aluminum alloy and 7xxx aluminum alloy was produced by semi-continuous casting. Macrostructure, microstructure, composition distribution and hardness distribution of composite interface were analyzed. Macrostructure shows that composite interface is planar and clean with little evidence of porosity; microstructure shows that composite interface is a kind of metallurgical bonding; composition and hardness distributions have a good corresponding relationship. At the same time, the mechanical property of composite interface was measured, the tensile strength is 71 MPa, the shearing strength is 62 MPa and the bending strength is 142.5 MPa, which can also show that composite interface is a kind of metallurgical bonding. Temperature distribution of composite interface was obtained by measuring temperatures near composite interface in lxxx aluminum alloy.

关键词： Composite material lxxx aluminum alloy 7xxx aluminum alloy Semi-continuous casting

Online measurement of solids motion in fluidized bed reactor with different distributor for Fischer–Tropsch synthesis

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2003-2008页

作者： Xiaolai zhang Weixin Qian haitao zhang Qiwen Sun Weiyong Ying Engineering Research Centre of Large Scale Reactor Engineering and Technology Ministry of Education State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Coal Liquefaction and Coal Chemical Technology Shanghai 201203 China

In this paper, the distributions of particle velocity in a gas–solid fluidized bed with branched pipe distributor or circle distributor were measured by using a laser Doppler velocimetry. Our results show that, within a certain range of superficial gas velocity, when using circle distributor, the particle velocity is large and the distribution of the particle velocity is even more compared with the branched pipe distributor. On the basis of the amplitude of tangential movement statistics, the amplitude of tangential movement statistics(AVATMS) decreases with increasing the axial height under the appropriate superficial gas velocity.

关键词： Fischer–Tropsch synthesis Laser Doppler velocimetry Fluidized bed

Highly bonded T-Nb2O5/rGO nanohybrids for 4 V quasisolid state asymmetric supercapacitors with improved electrochemical performance

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Nano Research 2018年第9期11卷 4673-4685页

作者： Yuzhi Jiao haitao zhang Hailang zhang Ao Liu Yanxia Liu Suojiang zhang Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing I O0190 China School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China Department of Chemical and Material Engineering Hefei University Hefei 230601 China Zhengzhou Key Laboratory of Energy Storage Science and Technology Zhengzhou Institute of Emerging Industrial Technology Zhengzhou 450000 China

Orthorhombic niobium pentoxide （T-Nb2O5）/reduced graphene oxide nanohybrids were fabricated via the hydrothermal attachment of Nb2Os nanowires to dispersed graphene oxide nanosheets followed by a high-temperature phase transformation. Electrochemical measurements showed that the nanohybrid anodes possessed enhanced reversible capacity and superior cycling stability compared to those of a pristine T-Nb205 nanowire electrode. Owing to the strong bonds between graphene nanosheets and T-Nb2O5 nanowires, the nanohybrids achieved an initial capacity of 227 mAh·g^-1. Additionally, non-aqueous asymmetric supercapacitors （ASCs） were fabricated with the synthesized nanohybrids as the anode and activated carbon as the cathode. The 3 V Li-ion ASC with a LiPF6-based organic electrolyte achieved an energy density of 45.1 Wh·kg^-1 at 715.2 W·kg^-1. The working potential could be further enhanced to 4 V when a polymer ionogel separator （PVDF-HFP/LiTFSI/EMIMBF4） and formulated ionic liquid electrolyte were employed. Such a quasi-solid state ASC could operate at 60℃ and delivered a maximum energy density of 70 Wh·kg^-1 at 1 kW·kg^-1.

关键词： solid-state supercapacitor nanohybrid electrode ionogel polymer electrolyte electrochemicalperformance

Adaptive control method for nonlinear time-delay processes

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Journal of Systems Engineering and Electronics 2007年第3期18卷 566-576页

作者： Chen Zonghai zhang haitao Li Ming Xiang Wei Dept of Automation Univ of Science and Technology of China Hefei 230027 P R China

Two complex properties, varying time-delay and block-oriented nonlinearity, are very common in chemical engineering processes and not easy to be controlled by routine control methods. Aimed at these two complex properties, a novel adaptive control algorithm the basis of nonlinear OFS （orthonormal functional series） model is proposed. First, the hybrid model which combines OFS and Volterra series is introduced. Then, a stable state feedback strategy is used to construct a nonlinear adaptive control algorithm that can guarantee the closed-loop stability and can track the set point curve without steady-state errors. Finally, control simulations and experiments on a nonlinear process with varying time-delay are presented. A number of experimental results validate the efficiency and superiority of this algorithm.

关键词： adaptive control block-oriented nonlinearity varying time-delay OFS Volterra Series,

Product distributions of Fischer-Tropsch synthesis over Co/AC catalyst

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Journal of Natural Gas Chemistry 2011年第4期20卷 389-396页

作者： Weixin Qian haitao zhang Weiyong Ying Dingye Fang Engineering Research Center of Large Scale Reactor Engineering and Technology Ministry of EducationState Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

The product distributions of Fischer-Tropsch synthesis over Co/AC catalyst are investigated under different reaction conditions in an integral fixed bed *** is found that the product distributions deviate from the ASF *** deviation from ASF distribution is analyzed by taking the readsorption of alkenes and the following secondary reaction into *** is noted that the contents of alcohol,alkene and alkane decline with the increasing carbon number,showing a slighter declining tendency of alkanes than those of alkenes and *** is also found that high temperature,space velocity,H2/CO in feed gas and low pressure are preferential for light hydrocarbons and alcohols while against the chain *** effect of space velocity on the product distributions especially on the light products is not *** is noticed that low temperature,space velocity,H2/CO and high pressure lead to high contents of alcohols;high temperature,H2/CO and low space velocity lead to high contents of *** effect of pressure on the amounts of alkanes is not significant;high space velocity and low temperature,pressure,H2/CO are preferential for alkenes.

关键词： Fischer-Tropsch synthesis product distribution Co/AC catalyst

autoC: an efficient translator for model checking deterministic scheduler based OSEK/VDX applications

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Science China(Information Sciences) 2018年第5期61卷 141-155页

作者： haitao zhang Zhuo CHENG Guoqiang LI Shaoying LIU School of Information Science and Engineering Lanzhou University School of Information Science Japan Advanced Institute of Science and Technology School of Software Shanghai Jiao Tong University Faculty of Computer and Information Sciences Hosei University

The OSEK/VDX automotive OS standard has been widely adopted by many automobile manufacturers, such as BMW and TOYOTA, as the basis for designing and implementing a vehicle-mounted OS. With the increasing functionalities in vehicles, more and more multi-task applications are developed based on the OSEK/VDX OS. Currently, ensuring the reliability of the developed applications is becoming a challenge for developers. As to ensure the reliability of OSEK/VDX applications, model checking as a potential solution has attracted great attention in the automotive industry. However, existing model checkers are often unable to verify a large-scale OSEK/VDX application that consists of many tasks, since the corresponding application model too complex. To make existing model checkers more scalable in verifying large-scale OSEK/VDX applications, we describe a software tool named auto C to tackle this problem by automatically translating a multi-task OSEK/VDX application into an equivalent sequential model. We conducted a series of experiments to evaluate the efficiency of auto C. The experimental results show that auto C is not only capable of efficiently sequentializing OSEK/VDX applications, but also of improving the scalability and efficiency of existing model checkers in verifying large-scale OSEK/VDX applications.

关键词： OSEK/VDX application deterministic scheduler software formal method model checking sequentialization