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Chinese Journal of Chemical Engineering 2022年第1期35卷 441-448页

作者： yu Dong Tiantian Ping Shufeng shen School of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018China

Nonaqueous amine-based system is an attractive solution to overcome high-energy-intensive CO_(2) capture process using the conventional aqueous *** nonaqueous absorbent of 2-(butylamino)ethanol(BAE)with 2-butoxyethanol(2-BE)has been recently proposed for low-energyconsumption CO_(2) *** this work,Henry’s law constants of CO_(2) in the BAE/2-BE blend were obtained by N_(2)O/CO_(2) analogy,and correlated in the temperature range of(283–333)***-liquid equilibrium(VLE)data for the BAE+CO_(2)+2-BE system at 65.4%(mass)BAE were also determined in a stirred equilibrium cell at temperatures of(313–393)K and CO_(2) partial pressures up to 275 kPa.A single apparent equilibrium constant KCO_(2);app was proposed for this system and correlated as a function of temperature,carbonated degree of amine and CO_(2) *** data were well represented by the modified Kent-Eisenberg model with an average absolute relative deviation(AARD)of 13%.

关键词： Solubility CO_(2)capture Nonaqueous absorbent 2-(Butylamino)ethanol 2-Butoxyethanol Model

Strain-promoted S-arylation and alkenylation of sulfinamides using arynes and cyclic alkynes

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Science China Chemistry 2024年第3期67卷 928-935页

作者： Xi Zou Boming shen Gao-lin Li Qian liang Yanhua Ouyang Binghe Yang Peiyuan yu Bing Gao State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringInstitute of Chemical Biology and NanomedicineHunan UniversityChangsha 410082China Department of Chemistry and shenzhen Grubbs Institute Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhen 518055China

The conversion of commercially available chiral sulfinamides into pharmaceutically useful chiral sulfoximines via direct SIVfunctionalization is synthetically attractive but challenging due to the competitive reaction of N-functionalization. Herein, we disclose a novel strain-release strategy to access stereospecific and chemoselective SIV-arylation and alkenylation of sulfinamides using arynes and strained cyclic alkynes. This method tolerates an unprecedented chemical diversity of functional groups attached to the nitrogen center(N-R). The origin of the high SIV-selectivity is elucidated by density functional theory calculations, suggesting a stepwise mechanism for the aryne substrates and a concerted mechanism for the cyclic alkynes.

关键词： arylation alkenylation sulfoximines sulfinamides arynes

Highly Efficient and Thermal Robust Cobalt Complexes for 1,3-Butadiene Polymerization

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Chinese Journal of Polymer Science 2022年第11期40卷 1369-1379页

作者： liang Fang Wen-Peng Zhao Chun-yu Zhang Xue-Quan Zhang Xian-De shen Heng Liu Toyoji Kakuchi Research Center for Polymer Materials School of Materials Science and EngineeringChangchun University of Science and TechnologyJilin130022China Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science&TechnologyQingdao266061China Division of Applied Chemistry Faculty of EngineeringHokkaido UniversitySapporoHokkaido060-8628Japan

A family of highly bulky bis(salicylaldiminate)Co(Ⅱ)complexes bearing cavity-like conformations are disclosed *** to their unique bulky nature around the cobalt atoms that are reflected from space-filling models and the buried volume percentages,obviously longer bond distances of Co―N and Co―O are revealed from those ***,because of these well-protected active species,the cobalt complexes are able to catalyze 1,3-butadiene polymerization in high yields at extreme low catalyst concentrations,revealing a ultra high catalytic *** a ratio of 50000,all the complexes can afford polybutadiene with yields higher than 90%.Furthermore,the highly steric bulkiness of the ligand can also significantly enhance the thermostability of the active *** temperature of 80-120°C,the complexes are able to successfully maintain high activities,giving polymer yields up to 90%.

关键词： Butadiene polymerization Bis(salicylaldiminate)Co(Ⅱ)complexes Ultra high catalytic efficiency

An improved LuGre model for calculating static steering torque of rubber tracked chassis

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Defence Technology（防务技术） 2022年第5期18卷 797-810页

作者： Kang liang Qun-zhang Tu Xin-min shen Zhong-hang Fang Xuan Yang Yong Zhang Hui-yu Xiang College of Field Engineering Army Engineering University of PLANanjing210007China State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery Xuzhou Construction Machinery GroupXuzhou221004China

Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track,which can greatly improve the maneuverability of military construction ***,there is almost no effective calculation model for the real-time static steering *** the relative sliding speed is greater than 0.01 m/s,the influence of friction heating can not be *** improved LuGre model is established to calculate the static real-time steering torque of tire and rubber track interchangeable ***,the friction heating model between rubber and ground is *** with the influence of temperature on the dynamic performance of rubber material,the influence of friction heating on the stiffness and friction coefficient of rubber track is analyzed,and the improved LuGre friction model is *** steering torque of tire and rubber track interchangeable chassis is affected by rubber material properties,steering speed,pavement type,and ambient *** with the original Lu Gre model,the improved LuGre model captures the change in friction torque during multiple in-situ turns due to frictional *** error with the experimental data is small,which verifies the effectiveness of the improved LuGre model.

关键词： Rubber track Static steering torque Friction model Chassis Maneuverability Vehicle

Three-dimensional numerical solution and stress cage analysis of high conductive fractures pressure sealing

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Petroleum 2022年第1期8卷 128-137页

作者： Haibo liang Guobing Ding Xinpu shen School of Mechanical and Electrical Engineering Southwest Petroleum UniversityChengdu610500China School of Petroleum Engineering China University of PetroleumQingdao266580China

Aiming at the main problems in the design and analysis of well wall strengthening for fractured formations,a three-dimensional(3D)numerical simulation scheme is *** three-dimensional finite element software is used to analyze the mechanical behavior of fractures and the pressure sealing process,and evaluate the stress cage *** main features of the model are as follows:(1)The equivalent fractures in the analytical model represent the function sum of the mechanical behavior of all fractures on the well wall,which is a functionally equivalent crack.(2)When evaluating the stress cage effect,the shape of the crack wedge filled with the plugging agent particles is formed by simulating the fractures opening process under the injection pressure,not a given regular shape.(3)In the model of calculating bull heading of block agent,the liquid pressure on the well wall is the injection pressure,which is a variation increased with *** fluid pressure on the well wall in the stress cage calculation model is generated by the initial pore pressure.(4)The numerical evaluation of the stress cage effect is achieved by calculating the increase amplitude FX of the minimum hoop stress on the well *** this model,several sets of injection pressure design values can be used for pressure plugging numerical simulation and stress cage effect evaluation calculation,and then the optimal and accurate quantitative value of“injection pressure,block agent particle size,safe mud window upper bound”are found through ***,through an engineering example of horizontal well drilling pressure sealing in a shale gas reservoir developed by a fracture,we use the above theoretical tools to introduce the process and results of the numerical analysis of the extended mud window drilled in the shale gas fissure reservoir.

关键词： Well wall strengthening Pressure sealing Stress cage Extended mud window Numerical simulation Natural crack Quasi-brittle Damage mechanics

Bilayer Compounded Polytetrafluoroethylene Membrane for Enhanced Oil-Water Emulsion Separation

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Chinese Journal of Polymer Science 2024年第6期42卷 838-850页

作者： yu-liang Yang Tai-Ran Zhang Yan-Ting Han Shao-yun Guo Qin-Gong Rong Jia-Bin shen State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversitySichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyChengdu610065China West China Hospital/West China School of Nursing Sichuan UniversityChengdu610041China Shandong Senrong New Materials Co. Ltd.Zibo256401China

In order to achieve efficient and durable oil-water emulsion separation,the membranes possessing high separation efficiency and mechanical strength attract extensive attention and are in great *** present study,a kind of polytetrafluoroethylene(PTFE)-based bilayer membrane was fabricated by electrospinning fibrous PTFE(fPTFE)on an expanded PTFE(ePTFE)*** morphological observation revealed that the fibrous structure of the fPTFE layer could be tailored by controlling the formulation of spinning *** addition of appropriate polyoxyethylene(PEO)would make the fibers in the fPTFE layer finer and more *** a result,the compounded membrane exhibited a small pore size of approximately 1.25µm and a substantial porosity nearing 80%.This led to super-hydrophobicity,characterized by a high water contact angle(WCA)of 149.8°,and facilitated rapid oil *** water-in-oil emulsion separation experiment further confirmed that the compounded membrane not only had a high separation efficiency closing 100%,but such an outstanding separation capacity could be largely retained,either through multiple cycles of use or through strong acid(pH=1),strong alkali(pH=12),or high-temperature(100°C)***,the mechanical behavior of the bilayer membrane was basically contributed by that of each layer in terms of their volume *** significantly,the poor creep resistance of fPTFE layer was suppressed by compounding with ePTFE ***,this study has laid the groundwork for a novel approach to create PTFE-based compounded membranes with exceptional overall characteristics,showing promise for applications in the realm of emulsion separation.

关键词： ePTFE Electrospinning membrane Bilayer compounding Emulsion separation

Experiment on aluminum alloy members under axial compression

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Frontiers of Structural and Civil Engineering 2015年第1期9卷 48-64页

作者： Xiaonong GUO Shuiping liang Zuyan shen College of Civil Engineering Tongji University Shanghai 200092 China

To improve the design methods of Chinese aluminum alloy members, experiment of 63 profiled aluminum alloy members, made of Chinese aluminum alloy 6061-T6, under axial compression is conducted in this paper. Valuable experimental data are obtained. At the same time, in order to obtain the relevant data, a large number of other experimental data from published papers and technical reports are collected and sorted out. 167 valid experimental data points are obtained finally. Furthermore, for the purpose of creating column curves, the aluminum alloy members under the axial compression, used in experiments, are analyzed by means of FEM. Based on the numerical results, 2 column curves are created by means of the numerical fitting method. The column curves are compared with the calculated data according to the experimental results for verification, and also are verified with the curves in design codes of several relevant countries. The numerical results show that the column curves obtained in this paper are valid and reliable.

关键词： aluminum alloy column curve compression members overall stability coefficient

Effective Response of Nonlinear Composite under External AC and DC Electric Field

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Communications in Theoretical Physics 2005年第4X期44卷 731-734页

作者： LIU Ye liang Fang-Chu shen Hong-liang Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Department of Mathematics Ningbo University of Technology Ningbo 315016 China Hebei Province Tobacco Quality Testing Station of Hebei Tobacco Company Shijiazhuang 050051 China

A perturbation method is used to study effective response of nonlinear Kerr composites, which are subject to the constitutive relation of electric displacement and electric field, Dα=εαE＋xα｜E｜^2E. Under the external AG and DC electric field Eapp = Eα（1 ＋ sinωt）, the effective nonlinear responses and local potentials are induced by the cubic nonlinearity of Kerr materials at all harmonics. As an example in three dimensions, we have investigated this kind of nonlinear composites with spherical inclusions embedded in a host. At all harmonic frequencies, the potentials in inclusion and host regions are derived. Furthermore, the formulae of the effective linear and nonlinear responses are given in the dilute Iimit.

关键词： nonlinear composite dielectric response AC electric field

Periodic boundary value problem for the first order functional differential equations with impulses

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Applied Mathematics(A Journal of Chinese Universities) 2009年第1期24卷 27-35页

作者： liang Rui-xi shen Jian-hua Dept. of Math. Hunan Normal Univ. Hunan 410081 China Dept. of Math. Huaihua College Hunan 418008 China

This paper is concerned with the existence and approximation of solutions for a class of first order impulsive functional differential equations with periodic boundary value conditions. A new comparison result is pres... 详细信息

关键词： functional differential equation periodic boundary value problem lower and upper solution monotone iterative method

Numerical prediction of the flow property in round turbulent jet of fiber suspension

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 298-305页

作者： LIN JianZhong liang Xiaoyu shen SuHua Department of Mechanics Zhejiang University College of Metrology & Measurement Engineering China Jiliang University

The equation of probability distribution function for mean fiber orientation,and the equations of Reynolds averaged NavierStokes,turbulence kinetic energy and turbulence dissipation rate with the additional term of the fibers are derived and solved *** effects of fiber concentration and fiber aspect-ratio on the mean velocity profile,turbulent kinetic energy and turbulent viscosity are *** results show that the mean axial velocity gradient increases near the centerline and decreases near the outside,respectively,as the fiber concentration *** mean axial velocity decreases with increasing the fiber concentration at the same radial *** centerline mean axial velocity decreases with axial distance,and this phenomenon is more obvious as the fiber concentration *** turbulent kinetic energy and turbulent viscosity increase over the jet region with an increasing fiber *** variation tendency of mean axial velocity,turbulence kinetic energy and turbulence viscosity with fiber aspect-ratio is the same as that with fiber *** difference is that the variation with fiber concentration is more obvious than with fiber aspect-ratio.

关键词： turbulent fiber suspension round jet numerical simulation flow property