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Finite element analysis on the seismic behavior of side joint of Prefabricated Cage System in prefabricated concrete frame

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1095-1104页

作者： Yunlin LIU shitao ZHU School of Civil Engineering Anhui Jianzhu UniversityHefei 230601China

The Prefabricated Cage System (PCS) has the advantages of high bearing capacity and good ductility. Meanwhile, it is convenient for factory production and it is beneficial to the cost savings, construction period shortening. Side joint is the weak region of PCS concrete frame and has great influence on seismic behavior of the whole structure. Thus systematically study on the seismic behavior of PCS concrete side joint is necessary. This paper presents a finite element study on behavior of the side joint under seismic loading. In the finite element model, PCS concrete and the reinforced concrete (RC) is modeled by the solid element and fiber-beam element, respectively. The numerical results is compared with the experimental results and it is found that the results of model based on fiber-beam element is in better agreement with the experimental results than solid clement model. In addition, the overall seismic behavior of the side joints in PCS concrete is better than that of the RC with the same strength.

关键词： PCS concrete side joint numerical simulation fiber-beam element joint model solid element joint model seismic behavior

On Harmonic Approximation for Large Josephson Junction Coupling Charge Qubits

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Communications in Theoretical Physics 2005年第5期43卷 795-798页

作者： shitao CHENBing SONGZhi DepartmentofPhysics NankaiUniversityTianjin300071China

We revisit the harmonic approximation (HA) for a large Josephson junction interacting with some charge qubits through the variational approach for the quantum dynamics of the junction-qubit coupling system. By making use of numerical calculation and analytical treatment, the conditions under which HA works well can be precisely presented to control the parameters implementing the two-qubit quantum logical gate through the couplings to the large junction with harmonic oscillator Hamiltonian.

关键词： josephson junction charge qubits harmonic approximation

Displacement of shale gas confined in illite shale by flue gas: A molecular simulation study

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Chinese Journal of Chemical Engineering 2021年第1期34卷 295-303页

作者： Tong Tao shitao Wang Yixin Qu Dapeng Cao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The shale gas is an unconventional supplementary energy to traditional fossil energy,and is stored in layered rocks with low permeability and porosity,which leads to the difficulty for exploration of shale ***,using CO_(2) gas to displace shale gas has become an important *** this work,we use molecular simulations to study the displacement of shale gas by flue gas rather than CO_(2),in which flue gas is modeled as a binary mixture of CO_(2) and N_(2) and the shale model is represented by inorganic Illite and organic ***_(4) is used as a shale gas *** to the pure CO_(2),flue gas is easily available and the cost of displacement by flue gas would become *** indicate that the pore size of shale is an important factor in the process of displacing shale gas and simultaneously sequestrating flue gas,while the flue gas N_(2)-CO_(2) ratio shows a small effect on the process of CH_(4) displacement,because the high partial pressure of flue gas is the main driving force for displacement of shale ***,the geological condition also has a significant effect on the process of CH_(4) displacement by flue ***,we suggest that the burial depth of 1 km is suitable operation condition for shale gas *** is expected that this work provides a useful guidance for exploitation of shale gas and sequestration of greenhouse gas.

关键词： Displacement of shale gas Flue gas Illite shale Organic matter Molecular simulation

The Adjacency Codes of the First Yellow Graphs

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Journal of Systems Science & Complexity 2023年第4期36卷 1757-1768页

作者： SHI Minjia LI shitao KIM Jon-Lark SOLE Patrick Key Laboratory of Intelligent Computing and Signal Processing Ministry of EducationSchool of Mathematical SciencesAnhui UniversityHefei 230601China State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China School of Mathematical Sciences Anhui UniversityHefei 230026China Department of Math Sogang UniversitySeoulSouth Korea Aix Marseille Univ CNRSCentrale MarseilleI2MMarseilleFrance

The authors study the binary codes spanned by the adjacency matrices of the strongly regular graphs(SRGs)on at most two hundred vertices whose existence is *** authors show that in length less than one hundred they cannot be cyclic,except for the exceptions of the SRGs of parameters(85,42,20,21)and(96,60,38,36).In particular,the adjacency code of a(85,42,20,21)is the zero-sum *** the range[100,200]the authors find 29 SRGs that could possibly have a cyclic adjacency code.

关键词： Cyclic codes strongly regular graphs adjacency codes self-orthogonal codes

Dynamic hesitant fuzzy linguistic group decision-making from a reliability perspective

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Journal of Systems Engineering and Electronics 2018年第5期29卷 1009-1021页

作者： MA Zhenzhen PONNAMBALAM Kumaraswamy ZHU Jianjun ZHANG shitao College of Economics and Management Nanjing University of Aeronautics and Astronautics Department of Systems Design Engineering University of Waterloo School of Mathematics & Physics Science and Engineering Anhui University of Technology

A dynamic hesitant fuzzy linguistic group decisionmaking(DHFLGDM) problem is studied from the perspective of information reliability based on the theory of hesitant fuzzy linguistic term sets(HFLTSs). First, an approach is applied to transform the dynamic HFLTSs(DHFLTSs) into a set of proportional linguistic terms to eliminate the time dimension. Second, expert reliability is measured by considering both group similarity and degree of certainty, and an optimization method is employed to quantify the linguistic terms by maximizing the group similarity. Third, through computing the attribute stability as well as its reliability, a combination rule which considers both reliability and weight is proposed to aggregate the information, and then the aggregated grade values and degree of stability are used to make a selection. Finally,the application and feasibility of the proposed method are verified through a case study and method comparison.

关键词： dynamic decision-making hesitant fuzzy linguistic term sets(HFLTSs) proportional linguistic terms group similarity degree of certainty

Selective adsorption of SF_(6) in covalent-and metal-organic frameworks

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Chinese Journal of Chemical Engineering 2021年第11期34卷 88-95页

作者： Xianqiang Zheng Yanlong Shen shitao Wang Ke Huang Dapeng Cao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Laser Interaction with Matter Northwest Institute of Nuclear TechnologyXi’an 710024China

Sulfur hexafluoride(SF_(6))is an extremely severe greenhouse *** is an urgently important mission to find excellent candidates for selective adsorption of SF_(6),in order to reduce the emission of SF_(6) ***,we adopt the molecular simulation method to systematically explore the selective adsorption of SF_(6) in 22 kinds of representative covalent-and metal-organic *** indicate that COF-6 is a promising candidate for the SF_(6) adsorption at low pressure P<20 kPa because of its small pore size,while MOF-180 and PAF-302 are excellent candidates at high pressure P=2×10^(3) kPa due to their large Brunauer-Emmett-Teller specific surface area(BET SSA)and pore *** the two cases of the power industry(X_(SF_(6))=0.1)and the semiconductor industry(X_(SF_(6))=0.002)environments,COF-6 and ZIF-8 are fairly promising candidates for selective adsorption of SF_(6) from the SF_(6)/N_(2) mixtures,because they not only present the high selectivity,but also the large adsorption capacity at ambient environment,which can be considered as potential adsorbents for selective adsorption of SF_(6) at ambient conditions.

关键词： Sulfur hexafluoride(SF_(6)) Metal-organic frameworks Molecular simulation Covalent-organic frameworks Adsorption Separation

A Green and Efficient Trinitration System for Aromatic Compounds with Bi（NO3）3·5H2O/[HMIMICIO4 as Catalyst in HNO3/Ac2O

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Chemical Research in Chinese Universities 2015年第5期31卷 761-765页

作者： SUN Weizhi YU shitao XIAN Mo CAS Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China College of Chemical Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China

To investigate the green trinitration method of aromatic compounds, with Lewis acid/ionic liquid as catalyst and HNOJAc2O as nitration reagent, a Lewis acid/ionic liquid/HNO3/Ac2O system was established. In various combinations of Lewis acids and ionic liquids, Bi（NO3）3-5H2O/[HMIM]CIO4 proved to be a very efficient catalyst for the trinitration of activated aromatic compounds and reusable for 3 times. Reaction conditions for the trinitration were optimized and yields of the trinitro products were from mild to excellent. This sulfuric acid-free system has the advantages of strong trinitration ability, low environment pollution, low toxicity, low cost and high potential for industrial application.

关键词： Green trinitration Aromatic compound Lewis acid Ionic liquid Acetyl nitrate

A Certified Cubic B-Spline Interpolation Method with Tangential Direction Constraints

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Journal of Systems Science & Complexity 2024年第3期37卷 1271-1294页

作者： HE shitao SHEN Liyong WU Qin YUAN Chunming School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China KLMM Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

Curve interpolation with B-spline is widely used in various areas. This problem is classic and recently raised in application scenario with new requirements such as path planning following the tangential vector field under certified error in CNC machining. This paper proposes an algorithm framework to solve Hausdorff distance certified cubic B-spline interpolation problem with or without tangential direction constraints. The algorithm has two stages: The first stage is to find the initial cubic B-spine fitting curve which satisfies the Hausdorff distance constraint;the second stage is to set up and solve the optimization models with certain constraints. Especially, the sufficient conditions of the global Hausdorff distance control for any error bound are discussed, which can be expressed as a series of linear and quadratic constraints. A simple numerical algorithm to compute the Hausdorff distance between a polyline and its B-spline interpolation curve is proposed to reduce our *** results are presented to show the advantages of the proposed algorithms.

关键词： Cubic B-spline Hausdorff distance interpolation tangential direction

Transformation of plant young proembryos by electroporation

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Chinese Science Bulletin 2000年第13期45卷 1202-1206,1249页

作者： shitao Li Shenghua Wang Hongyuan Yang Wuhan Univ Res Ctr Dev Biol Wuhan 430072 Peoples R China

It is first reported that plant young proembryos expressed exogenous reporter genes by electroporation. Young proembryos with 8-32 cells and globular proembryos with 250-400 cells could be isolated by enzymatic maceration combined with microdissection. After electroporation with GUS or GFP genes, the proembryos were cultured for 1 -2 d in KM8p medium. At the field strength of electroporation 500-1 500 V/cm, blue reaction of GUS or green fluorescence of GFP could be observed in the proembryos. The highest transient expression frequency of young proembryos (2.2%) was obtained at the field strength of 750 V/cm, whereas the highest frequency of globular proembryos (5.9%) was obtained at the field strength of 1 250 V/cm. Taking the proportion of transformed cells in the whole cells of proembryos as efficient transformation frequency, the efficient transformation frequency of the young proembryos was 7 times that of the globular proembryos.

关键词： electroporation GUS GFP proembryo Nicotiana tabacum.