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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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Suppressing Effects of Ag Wetting Layer on Surface Conduction of Er Silicide/Si(001) Nanocontacts

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Chinese Physics Letters 2018年第8期35卷 74-78页

作者： qing Han Qun cai State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093

Current-voltage electrical characteristics of Er silicide/Si（001） nanocontacts are measured in situ in a scanning tunneling microscopy system. Introduced as a new technique to suppress surface leakage conduction on Si（001）,a silver wetting layer is evaporated onto the substrate surface kept at room temperature with Er Si2 nanoislands already existing. The effects of the silver layer on the current-voltage characteristics of nanocontacts are *** experimental results reveal that the silver layer at coverage of 0.4–0.7 monolayer can suppress effectively the current contribution from the surface conduction path. After the surface leakage path of nanocontacts is obstructed, the ideality factor and the Schottky barrier height are determined using the thermionic emission theory, about 2 and 0.5 eV, respectively. The approach adopted here could shed light on the intrinsic transport properties of metal-semiconductor nanocontacts.

关键词： Ag Suppressing Effects of Ag Wetting Layer on Surface Conduction of Er Silicide/Si Nanocontacts

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Research progress in CALPHAD assisted metal additive manufacturing

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China Foundry 2024年第4期21卷 295-310页

作者： Ya-qing Hou Xiao-qun Li Wei-dong cai qing Chen Wei-ce Gao Du-peng He Xue-hui Chen Hang Su China Iron&Steel Research Institute Group Beijing 100081China Thermo-Calc Software AB SolnaSE-169Sweden KTH Royal Institute of Technology StockholmSE-100Sweden Central Iron and Steel Research Institute Beijing 100081China

Metal additive manufacturing(MAM)technology has experienced rapid development in recent *** both equipment and materials progress towards increased maturity and commercialization,material metallurgy technology based on high energy sources has become a key factor influencing the future development of *** calculation of phase diagrams(CALPHAD)is an essential method and tool for constructing multi-component phase diagrams by employing experimental phase diagrams and Gibbs free energy models of simple *** combining with the element mobility data and non-equilibrium phase transition model,it has been widely used in the analysis of traditional metal *** development of CALPHAD application technology for MAM is focused on the compositional design of printable materials,the reduction of metallurgical imperfections,and the control of microstructural *** endeavor carries considerable theoretical and practical *** paper summarizes the important achievements of CALPHAD in additive manufacturing(AM)technology in recent years,including material design,process parameter optimization,microstructure evolution simulation,and properties ***,the limitations of applying CALPHAD technology to MAM technology are discussed,along with prospective research directions.

关键词： metal additive manufacturing CALPHAD integrated computational material engineering powder bed fusion material design microstructure simulation

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A Generalization of Implicit Ore-condition for Hamiltonicity of k-connected Graphs

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Acta Mathematicae Applicatae Sinica 2020年第3期36卷 620-626页

作者： Jun-qing cai Lin WANG School of Management Qufu Normal UniversityRizhao 276826China

In 2005,Flandrin et *** that if G is a k-connected graph of order n and V(G)=X1∪X2∪···∪Xk such that d(x)+d(y)≥n for each pair of nonadjacent vertices x,y∈Xi and each i with i=1,2,···,k,then G is *** order to get more sufficient conditions for hamiltonicity of graphs,Zhu,Li and Deng proposed the definitions of two kinds of implicit degree of a vertex v,denoted by id1(v)and id2(v),*** this paper,we are going to prove that if G is a k-connected graph of order n and V(G)=X1∪X2∪···∪Xk such that id2(x)+id2(y)≥n for each pair of nonadjacent vertices x,y∈Xi and each i with i=1,2,···,k,then G is hamiltonian.

关键词： implicit degree Hamiltonian cycle cyclability

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薄板坯连铸凝固应力分析的有限元算法的研究

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系统仿真学报 2003年第3期15卷 393-396,425页

作者：陈登福廖琪白晨光刘清才董凌燕温良英冯科重庆大学材料科学与工程学院重庆400044

研究了薄板坯凝固过程坯壳中的二维热弹塑性蠕变应力模型有限元求解实现的方法。讨论了采用三角形单元的模型有限元求解理论,铸坯凝固前和凝固后使总刚度矩阵非零元素的半带宽最小的节点与单元自动剖分和编号的原则、顺序及方法。探讨... 详细信息

研究了薄板坯凝固过程坯壳中的二维热弹塑性蠕变应力模型有限元求解实现的方法。讨论了采用三角形单元的模型有限元求解理论,铸坯凝固前和凝固后使总刚度矩阵非零元素的半带宽最小的节点与单元自动剖分和编号的原则、顺序及方法。探讨了采用变带宽压缩存储技术实现半带宽内元素存储的方法,以及应用直接三角分解法求解平衡线性方程组的方法;给出了用初荷载法将铸坯热应力和高温蠕变应力问题转换为单元节点等效荷载的结果。该模型已成功应用于薄板坯、方坯等连铸凝固过程的应力分析中。

关键词：薄板坯连铸高温应力有限元算法

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A novel nanofluid of modified carbon black nanoparticles for enhanced oil recovery in low permeability reservoirs

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Petroleum Science 2023年第3期20卷 1598-1607页

作者： Guang Zhao Li-Hao Liang dong-Fang Lv Wen-Juan Ji qing You cai-Li Dai School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580Shandongthe People's Republic of China Research Institute of Petroleum Exploration&Development PetroChinaBejing100083the People's Republic of China School of Energy Resources China University of Geosciences(Beijing)Bejing100083the People's Republic of China

A novel nanofluid of modified carbon black(MCB)nanoparticles was initially developed for enhanced oil recovery(EOR)in low permeability *** MCB nanoparticles were obtained via a three-step reaction involving modification by oxidation,acyl chlorination,and activated *** nano-particles were spherically dispersed,with an average size of 72.3 *** with carbon black(CB)nanoparticles,dispersed MCB nanoparticles can effectively reduce the oil-water interfacial tension(IFT)to 10^(-2)mN/m and change the surface wettability of sand *** on the results of core flooding experiments,the MCB nanoparticles exhibited a better EOR capacity than surfactants and CB nano-particles,and the final oil recovery was significantly increased by 27.27%.The core scanning test showed that the MCB nanoparticles could plug high permeability channels by adsorbing onto the surfaces of sand particles and forming larger aggregates that bridge across pores or throats,resulting in a higher swept *** synergistic effects of improved swept volume and oil displacement efficiency were the EOR mechanisms of the MCB *** studies indicate that these MCB nanoparticles have excellent potential for EOR in low permeability reservoirs.

关键词： Modified carbon black nanoparticles Interfacial tension reduction Displacement efficiency Synergistic effects Enhanced oil recovery

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PAd-shRNA-PTN reduces pleiotrophin of pancreatic cancer cells and inhibits neurite outgrowth of DRG

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World Journal of Gastroenterology 2011年第21期17卷 2667-2673页

作者： Jun Yao Min Zhang qing-Yong Ma Zheng Wang Lian-cai Wang dong Zhang Department of Hepatobiliary Surgery First-Affiliated Hospital of Medical College Xi'an Jiaotong University Xi'an 710061 Shaanxi Province China Department of Oncology First Affiliated HospitalHenan University of Science and Technology Luoyang 471003 Henan Province China

AIM:To investigate the silencing effects of pAdshRNA-pleiotrophin(PTN) on PTN in pancreatic cancer cells,and to observe the inhibition of pAd-shRNA-PTN on neurite outgrowth from dorsal root ganglion(DRG) neurons in ***:PAd-shRNA-PTN was used to infect pancreatic cancer BxPC-3 cells;assays were conducted for knockdown of the PTN gene on the 0th,1st,3rd,5th,7th and 9th d after infection using immunocytochemistry,real-time quantitative polymerase chain reaction(PCR),and Western blotting *** morphologic changes of cultured DRG neurons were observed by mono-culture of DRG neurons and co-culture with BXPC-3 cells in ***:The real-time quantitative PCR showed that the inhibition rates of PTN mRNA expression in the BxPC-3 cells were 20%,80%,50% and 25% on the 1st,3rd,5th and 7th d after *** and Western blotting analysis also revealed the same *** contrast to the control,the DRG neurons co-cultured with the infected BxPC-3 cells shrunk;the number and length of neurites were significantly ***:Efficient and specific knockdown of PTN in pancreatic cancer cells and the reduction in PTN expression resulted in the inhibition of neurite outgrowth from DRG neurons.

关键词： Pancreatic cancer Pleiotrophin RNA interference Neurite outgrowth Dorsal root ganglion

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Effect of basic fibroblast growth factor and danshen on bcl-2 and p53 mRNA expression in the brain of rats exposed to repeated, high, positive acceleration (+Gz)

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Neural Regeneration Research 2008年第7期3卷 747-750页

作者： Hongjin Liu qing cai Military Researching Center of Aeropathy Air-force General Hospital of Chinese PLA Beijing 100036 China

BACKGROUND： Both animal experiments and clinical studies have shown that basic fibroblast growth factor （bFGF） and danshen （Salvia miltiorrhiza） can exhibit protective effects on ischemia-reperfusion cerebral injury. OBJECTIVE： To test whether bFGF and danshen can protect cerebral injury induced by exposure to repeated, high, positive acceleration （＋Gz） in an animal model and to analyze the possible mechanisms. DESIGN, TIME AND SETTING： Randomized controlled animal study. The experiment was performed at the Research Center for Molecular Biology, Air-force General Hospital of Chinese PLA from April to August 2000. MATERIALS： A total of 20 clean grade, healthy, Sprague Dawley rats of both genders, weighing （200 ± 15） g, were provided by our experimental animal center. Rats were randomly divided into 5 groups： the control group, ＋Gz exposure group, bFGF group, danshen group, and saline group, with 4 animals per group. bFGF （Beijing Bailuyuan Biotechnology Co. Ltd.） and danshen solution （Shanghai Zhongxi Pharmaceutical Co. Ltd.） were used. METHODS： All rats were fixed on a rotary arm of a centrifugal apparatus （2 m in radius） with their heads oriented towards the center of the apparatus. Except for rats in the control group, the value of ＋Gz exposure was ＋14 Gz with an acceleration rate of 1.5 G/s. The peak force lasted for 45 seconds. ＋Gz exposure was performed three times with intervals of 30 minutes. Rats in the control group received the same ＋Gz procedure, but the G value was ＋1 Gz. Rats in bFGF group and danshen group were intraperitoneally injected with 100 μg/kg bFGF or 15 g/kg danshen solution, respectively, at 30 minutes prior to centrifugation and immediately after centrifugation. Rats in saline group were injected with the same volume of saline. Six hours after exposure, rats were decapitated. One hemisphere was preserved in liquid nitrogen for RNA extraction and the other was processed for apoptosis detection. MAIN OUTCOME MEASURES： mRNA levels of

关键词： positive acceleration rats apoptosis bcl-2 p53 gene expression basic fibroblast growth factor danshen

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Collision risk assessment of reduced aircraft separation minima in procedural airspace using advanced communication and navigation

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Chinese Journal of Aeronautics 2023年第4期36卷 315-337页

作者： qing cai Hao Jie ANG Sameer ALAM Air Traffic Management Research Institute School of Mechanical&Aerospace EngineeringNanyang Technological University639798Singapore

With the advancement of Communication,Navigation and Surveillance(CNS)technolo-gies such as space-based Automatic Dependent Surveillance-Broadcast/Contract(ADS-B/C),large separation minima may be reduced in procedural *** is of great significance to know the upper limit of the Reduced Separation Minima(RSM)for a procedural airspace and the corre-sponding consequences on collision risk with specifics of the advanced ADS-B and control interven-tion *** this work,an interactive software is first developed for collision risk *** software integrates the International Civil Aviation Organization(ICAO)collision risk models for lateral and longitudinal collision risk calculation for the Singapore procedural *** demonstrate that the lateral and longitudinal collision risk of Singapore procedural airspace with respect to current control procedures meets the ICAO Target Level of Safety(TLS)***,the feasibility of reducing the horizontal separations implemented in the Singapore pro-cedural airspace with respect to advanced CNS techniques is *** is found that if advanced CNS technologies are applied,then the current 50-NM lateral and longitudinal separa-tion standards can be reduced to 22 NM(1 NM=1.825 km)and 20 NM,respectively,to meet the TLS standards based on current demand.A method is then devised to expand the traffic demand by p for p∈[10%,200%].It is found that the minimum lateral and longitudinal separa-tions can be reduced from 50 NM to be within the range of[23,31]NM,and 20 NM,respectively,for p∈[10%,200%],while the collision risk still meets the TLS standards.

关键词： Air transportation Collision risk Procedural airspace Separation minima Space-based Automatic Dependent Surveillance-Bro adcast/Contract(ADS-B/C)

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Collision-induced Rotational Energy Transfer in an Atom-Diatom System

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Chinese Journal of Chemical Physics 2008年第5期21卷 457-462页

作者： Yan-qing Ni Jian Li Feng-cai Ma Department of Physics Liaoning University Shenyang 110036 China Department of Science Shenyang Institute of Aeronautical Engineering Shengyang 110036 China

As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom-diatom system, based on the first-Born approximation of time-dependent perturbation theory, taking into account the anisotropic Lennard-Jones interaction potential and the long-range interaction potential, the differential interference angles in singlet-triplet mixed states of CO A^1Π（v=9）-e3∑-（v=1） system in collision with He, Ne, Ar, and other partners were calculated theoretically. The relationships of differential interference angle versus impact parameters, including collision parameter b and velocity, are obtained.

关键词： Rotational energy transfer Collision-induced quantum interference Interference angle

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