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Effect of pile-cap connection on behavior of torsionally loaded pile groups

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 303-312页

作者： Ling-gang kong Li-min ZHANG Key Laboratory of Soft Soils and Geoenvironmental Engineering Ministry of Education Zhejiang University Hangzhou 310027 China Department of Civil Engineering The Hong Kong University of Science and Technology Hong Kong China

To evaluate the responses of fixed and pinned pile groups under torsion, a method is presented to analyze the nonlinear behavior of free-standing pile groups with rigid pile caps. The method is capable of simulating the nonlinear soil response in the near field usingp-y and r-θ curves, the far-field interactions through Mindlin＇s and Randolph＇s elastic solutions, and the coupling effect of lateral resistance on torsional resistance of the individual piles using an empirical factor. Based on comparisons of the solutions for fixed- and pinned-head, 1×2, 2×2, and 3×3 pile groups subjected to torsion, it was found that pile-cap connection significantly influences the torsional capacity of pile groups and the assignment of applied torques in the pile groups. In this study, the applied torques for the pinned-head pile groups are only 44%-64% of those for the corresponding fixed-head pile groups at a twist angle of 2^o. Such a difference is mainly due to the change of the lateral resistances of individual piles in the groups.

关键词： Pile group Pile foundations Torsional response Pile-cap connection Nonlinear analysis

Aircraft parameter estimation using a stacked long short-term memory network and Levenberg-Marquardt method

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Chinese Journal of Aeronautics 2024年第2期37卷 123-136页

作者： Zhe HUI Yinan kong Weigang YAO gang CHEN School of Aerospace Science and Technology Xidian UniversityXi’an 710071China Computation Aerodynamics Institution China Aerodynamics Research and Development CenterMianyang 621000China Faculty of Computing Engineering and MediaDe Montfort UniversityLeicester LE19BHUnited Kingdom School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an 710049China

To effectively estimate the unknown aerodynamic parameters from the aircraft’s flight data,this paper proposes a novel aerodynamic parameter estimation method incorporating a stacked Long Short-Term Memory(LSTM)network model and the Levenberg-Marquardt(LM)*** stacked LSTM network model was designed to realize the aircraft dynamics modeling by utilizing a frame of nonlinear functional mapping based entirely on the measured input-output data of the aircraft system without requiring explicit postulation of the *** LM method combines the already-trained LSTM network model to optimize the unknown aerodynamic *** proposed method is applied by using the real flight data,generated by ATTAS aircraft and a bio-inspired morphing Unmanned Aerial Vehicle(UAV).The investigation reveals that for the two different flight data,the designed stacked LSTM network structure can maintain the efficacy of the network prediction capability only by appropriately adjusting the dropout rates of its hidden layers without changing other network parameters(i.e.,the initial weights,initial biases,number of hidden cells,time-steps,learning rate,and number of training iterations).Besides,the proposed method’s effectiveness and potential are demonstrated by comparing the estimated results of the ATTAS aircraft or the bio-inspired morphing UAV with the corresponding reference values or wind-tunnel results.

关键词： Parameter estimation LSTM network model LM method Aerodynamic parameters Flight data Aircraft dynamics modeling Network prediction capability Network parameters

Zeolite powder addition to improve the performance of submerged gravitation-filtration membrane bioreactor

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Journal of Environmental Sciences 2006年第2期18卷 242-247页

作者： HE Sheng-bing XUE gang kong Hai-nan School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 China School of Environmental Science and Engineering.Donghua University Shanghai 200051 China

In this study, the effect of zeolite powder addition on submerged membrane bioreactor （SMBR） on membrane permeability, and the removals for COD, NH3-N, TN were investigated. Through the parallel operation of control and test systems, it was found that the zeolite powder addition could alleviate the ultra-filtration membrane fouling and enhance the membrane permeability. On the basis of experimental investigations, a concept of ＂protection coating layer＂ was proposed to illustrate the phenomenon of UF membrane fouling. In addition, the removal for COD in test system was more stable, a little higher compared to the control system. Due to the combination of nitrification and ion exchange, a more excellent removal for NH3-N in test system was obtained regardless of influent NH3-N loading rate. It was also found that a mean 25% higher TN removal took place in the test system, and ion exchange and simultaneous nitrification and de-nitrification were analyzed to be main factors. During the stable operation period, the SOURs of test zeolite powder added sludge and control activated sludge were measured to be 75 mgO2/（gMLVSS, h） and 24 mgO2/（gMLVSS, h） respectively, it meant that the zeolite powder addition could enhance the microorganism activity significantly.

关键词： submerged gravitation-filtration membrane bioreactor performance zeolite powder membrane fouling microorganism activity

Role of silicon in steels on galvanized coatings

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Acta Metallurgica Sinica(English Letters) 2009年第2期22卷 138-145页

作者： Chunshan CHE Jintang LU gang kong Qiaoyu XU College of Materials Science and Engineering South China University of Technology Guangzhou 510640 China

In this article, five kinds of silicon-containing steel sheets have been electrodeposited, and then immersed in a pure molten zinc bath at 450℃ for various periods of time. The results by scanning electron microscopy （SEM） show that the coating of the sample （0.09 wt pct Si） with iron-electrodeposited pretreatment eliminates the reactive zones which are found in the coating without iron-electrodeposited pretreatment. The galvanized sample （0.28 wt pct Si） with iron-electrodeposited pretreatment exhibits a compact and coherent coating. The coating of the sample （0.37 wt pct Si） with the iron-electrodeposited pretreatment experiences a transition from a compact and coherent coating to a reactive one. The energy dispersive spectrum （EDS） results reveal that for the galvanized samples with iron-electrodeposited pretreatment, excessive silicon accumulates on the surface of the substrate due to the low solubility of silicon in the Г, after the iron layer is depleted by the increasing growth of the Fe-Zn intermetallics. With the movement of the substrate/Г interface toward the substrate, silicon-enriched α-Fe peels off from the substrate and breaks into the particles. The particles move toward the δ layer through the Г layer because silicon-enriched α-Fe cannot be absorbed in the F layer. When the particles reach the δ/Г interface, they are dissolved in the δ laver, making the F laver thin or even vanish.

关键词： Zn coating Intermetallics Steel Electrodeposition Iron

Adsorptive removal of nitrogen-containing compounds from fuel by metal-organic frameworks

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Journal of Energy Chemistry 2013年第6期22卷 869-875页

作者： Zhaoyang Wang zhiguo Sun Linghao kong gang Li State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology

The adsorptive denitrogenation from fuels over three metal-organic frameworks(MIL-96(Al),MIL-53(Al)and MIL-101(Cr))was studied by batch adsorption *** nitrogen-containing compounds(NCCs)pyridine,pyrrole,quinoline and indole were used as model NCCs in fuels to study the adsorption *** physicochemical properties of the adsorbents were characterized by XRD,N2physical adsorption,FT-IR spectrum and Hammett indicator *** metal-organic frameworks(MOFs),especially the MIL-101(Cr)containing Lewis acid sites as well as high specific surface area,can adsorb large quantities of NCCs from *** addition,the adsorptive capacity over MIL-101(Cr)will be different for NCCs with different *** stronger basicity of the NCC is,the more it can be absorbed over MIL-101(Cr).Furthermore,pore size and shape also affect the adsorption capacity for a given adsorbate,which can be proved by the adsorption over MIL-53(Al)and MIL-96(Al).The pseudo-second-order kinetic model and Langmuir equation can be used to describe kinetics and thermodynamics of the adsorption process,***,the regeneration of the used adsorbent has been conducted successfully by just washing it with ethanol.

关键词： metal-organic framework nitrogen-containing compound adsorptive denitrogenation denitrogenation kinetics denitrogenation thermodynamics

Target Controllability of Multi-Layer Networks With High-Dimensional Nodes

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 1999-2010页

作者： Lifu Wang Zhaofei Li Ge Guo zhi kong School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China

This paper studies the target controllability of multilayer complex networked systems,in which the nodes are highdimensional linear time invariant(LTI)dynamical systems,and the network topology is directed and *** influence of inter-layer couplings on the target controllability of multi-layer networks is *** is found that even if there exists a layer which is not target controllable,the entire multi-layer network can still be target controllable due to the inter-layer *** the multi-layer networks with general structure,a necessary and sufficient condition for target controllability is given by establishing the relationship between uncontrollable subspace and output *** the derived condition,it can be found that the system may be target controllable even if it is not state *** this basis,two corollaries are derived,which clarify the relationship between target controllability,state controllability and output *** the multi-layer networks where the inter-layer couplings are directed chains and directed stars,sufficient conditions for target controllability of networked systems are given,*** conditions are easier to verify than the classic criterion.

关键词： High-dimensional nodes inter-layer couplings multi-layer networks target controllability

Dynamics of rotator chain with dissipative boundary

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Frontiers of physics 2014年第4期9卷 511-518页

作者： Pu Ke zhi-gang Zheng Department of Physics and the Beijing Hong kong Singapore Joint Center for Nonlinear and Complex Systems (Beijing) Beijing Normal University Beijing 100875 China

We study the deternfinistic dynanfics of rotator chain with purely mechanical driving on the boundary by stability analysis and numerical sinmlation. Globally synchronous rotation, clustered synchronous rotation, and split synchronous rotation states are identified. In particular, we find that the single-peaked wariance distribution of angular momenta is the consequence of the deterministic dynamics. As a result, the operational definition of temperature used in the previous studies on rotator chain should be revisited.

关键词： rotator chain energy conduction

Choledochoscope manometry about different drugs on the Sphincter of Oddi

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World Journal of Gastroenterology 2008年第38期14卷 5907-5912页

作者： Jing kong Shuo-Dong Wu Xiao-Bo Zhang Zhen-Sheng Li gang Shi Wei Wang Jun-zhi Chen Department of General Surgery Shengjing Hospital of China Medical University Shenyang 110004 Liaoning Province China Department of Pediatric Surgery Shengjing Hospital of China Medical University Shenyang 110004 Liaoning Province China

AIM： To assess the effects of H2-receptor blocking pharmacon, protease inhibitor, and gastro kinetic agents on the human Sphincter of Oddi （SO） motility by choledochoscope manometry. METHODS： One hundred and seventy-five patients with T tube installed after cholecystectomy and choledochotomy were assessed by choledochoscope manometry. They were randomly assigned into groups of H2-receptor blocking pharmacon, protease inhibitor, and gastro kinetic agents. The Sphincter of Oddi basal pressure （SOBP）, amplitude （SOCA）, frequency of contractions （SOF）, duodenal pressure （DP）, and common bile duct pressure （CBDP） were scored and analyzed. RESULTS： SOBP and SOCA were significantly decreased after Cimetidine administration, and no statistical difference was seen in the Famotidine group. In the Gabexate mesilate group, SOBP had decreased significantly. In the Ulinastatin group, SOCA decreased when Ulinastatin was given at the rate of 2500 U/min; when Ulinastatin administration was raised to 5000 U/ rain, SOBP, SOF and SOCA all experienced a fall. SOBP and SOCA for Domperidone and SOCA for Mosapride groups all decreased distinctly after administration. CONCLUSION： The regular dosage of Cimetidine showed an inhibitory effect on the motility of SO, while Famotidine had no obvious effects otherwise. Gabnexata mesilate, Ulinastatin and gastro kinetic agents also showed inhibitory effects on the SO motility.

关键词： Sphincter of Oddi Medicamentum Choledochoscope manometry

Aging properties and aging mechanism of activated waste rubber powder modified asphalt binder based on rheological properties and micro-characterization

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Frontiers of Structural and Civil Engineering 2023年第4期17卷 625-636页

作者： Peipei kong gang XU Liuxu FU Xianhua CHEN Wei WEI School of Transportation Southeast UniversityNanjing 211189China School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189China

The research and development of high-performance pavement materials has been intensified owing to the demand for long-life *** study is performed to develop a novel pavement material using waste rubber powder,waste lubricating by-product(LBP),and ***,the aging properties and aging mechanism of activated waste rubber powder modified asphalt(ARMA)are investigated based on its rheological properties and *** rheological results show that,compared with waste rubber powder modified asphalt(RMA),ARMA offers a higher aging resistance and a longer fatigue life.A comparison and analysis of the rheological aging parameters of ARMA and RMA show that LBP activation diminishes the aging sensitivity of *** microcharacterization result shows that the aging of ARMA may be caused by the fact that LBP-activated waste rubber powder is more reactive and can form a dense colloidal structure with ***,the evaporation loss of asphalt light components by heat and the damage to the colloidal structure by oxygen during the aging process are impeded,and the thermal-oxidative aging resistance of ARMA is improved.

关键词： rubber powder modified asphalt aging mechanism rheological characterization