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Chinese Journal of Structural Chemistry 2006年第9期25卷 1090-1094页

作者： WEI Yi-jun WANG feng-wu ZHU Qi-Yong Department of Chemistry. Huainan Normal College Huainan 232001 China

The title mononuclear cobalt（Ⅱ） complex [Co（DENP）2（MeOH）2].2NO3 （DENP = 2-[2-（diethylamino）ethyliminomethyl]-4-nitrophenolate） was prepared and characterized by elemental analysis, 1R and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 8.297（1）, b = 11.075（2）, c = 11.134（2） ,A,α = 69.69（1）, β = 70.97（2）, γ = 84.02（2）°, Z = 1, V = 907.0（4） ,A^3, Dc= 1.424 g/cm^3, Mr = 777.66, λ（MoKα） = 0.71073 A,μ= 0.548 mm^-1, F（000） = 409, R = 0.0628 and wR = 0.1734. The complex consists of a [Co（DENP）2- （MeOH）2]^2＋ cation and two disordered nitrate anions. The Co atom, lying at the inversion centre, is six-coordinated by two DENP ligands and two MeOH molecules in an octahedral geometry. The molecules in the crystal are linked through intermolecular O-H...O, O-H...N and N-H...O hydrogen bonds, forming chains parallel to the b axis.

关键词： Schiff base cobalt crystal structure

Phase Effects of Long-Wavelength Rayleigh–Taylor Instability on the Thin Shell

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Chinese Physics Letters 2020年第2期37卷 35-38页

作者： Zhi-Yuan Li Li-feng Wang jun-feng wu Wen-Hua Ye Institute of Applied Physics and Computational Mathematics Beijing 100094 Center for Applied Physics and Technology HEDPSand College of EngineeringPeking UniversityBeijing 100871

Taking the long-wavelength Rayleigh-Taylor instability(RTI) on the thin shell of inertial confinement fusion as the research object,a linear analytical model is presented to study the phase effects that are caused by the phase difference of single-mode perturbations on the two *** accuracy is tested by numerical *** analyzing the characteristic of this model,it is found that the phase difference does not change the basic RTI structure(only one spike and one bubble in a period).However,the symmetry of the spike and bubble is destroyed,which has non-expected influences on the convergent motion of ICF ***,the phenomenon that the distance between spikes and bubbles along the vertical direction of acceleration differs by π is *** is also shown that when the phase difference is large,the temporal evolution of the RTI is more serious and the thin target is easier to tend to break.

关键词： Effects bubble Rayleigh

Coupling between velocity and interface perturbations in cylindrical Rayleigh–Taylor instability

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Chinese Physics B 2018年第5期27卷 378-384页

作者： Hong-Yu Guo Li-feng Wang Wen-Hua Ye jun-feng wu Wei-Yan Zhang Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China

Rayleigh–Taylor instability(RTI)in cylindrical geometry initiated by velocity and interface perturbations is investigated analytically through a third-order weakly nonlinear(WN)*** the initial velocity perturbation is comparable to the interface perturbation,the coupling between them plays a significant *** difference between the RTI growth initiated only by a velocity perturbation and that only by an interface perturbation in the WN stage is negligibly *** effects of the mode number on the first three harmonics are discussed *** low-mode number perturbation leads to large amplitudes of RTI *** Atwood number and initial perturbation dependencies of the nonlinear saturation amplitude of the fundamental mode are analyzed *** the mode number of the perturbation is large enough,the WN results in planar geometry are recovered.

关键词： Rayleigh-Taylor instability weakly nonlinear cylindrical geometry

Weakly Nonlinear Rayleigh-Taylor Instability in Incompressible Fluids with Surface Tension

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Chinese Physics Letters 2017年第4期34卷 60-63页

作者： Hong-Yu Guo Li-feng Wang Wen-Hua Ye jun-feng wu Wei-Yan Zhang Graduate School China Academy of Engineering Physics Beijing 100088 Institute of Applied Physics and Computational Mathematics Beijing 100094 HEDPS Center for Applied Physics and Technology Peking University Beijing 100871

A weakly nonlinear model is established for incompressible Rayleigh-Taylor instability with surface tension. The temporal evolution of a perturbed interface is explored analytically via the third-order solution. The dependence of the first three harmonics on the surface tension is discussed. The amplitudes of bubble and spike are greatly affected by surface tension. The saturation amplitude of the fundamental mode versus the Atwood number A is investigated with surface tension into consideration. The saturation amplitude decreases with increasing A. Surface tension exhibits a stabilizing phenomenon. It is shown that the asymmetrical development of the perturbed interface occurs much later for large surface tension effect.

关键词： RAYLEIGH-Taylor instability NONLINEAR systems INCOMPRESSIBLE flow (Fluid mechanics) FLUIDS SURFACE tension

Weakly Nonlinear Rayleigh–Taylor Instability in Cylindrically Convergent Geometry

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Chinese Physics Letters 2018年第5期35卷 65-68页

The Rayleigh–Taylor instability（RTI） in cylindrical geometry is investigated analytically through a second-order weakly nonlinear（WN） theory considering the Bell–Plesset（BP） effect. The governing equations for the combined perturbation growth are derived. The WN solutions for an exponentially convergent cylinder are obtained. It is found that the BP and RTI growths are strongly coupled, which results in the bubble-spike asymmetric structure in the WN stage. The large Atwood number leads to the large deformation of the convergent interface. The amplitude of the spike grows faster than that of the bubble especially for large mode number m and large Atwood number A. The averaged interface radius is small for large mode number perturbation due to the mode-coupling effect.

关键词： RT In Taylor Instability in Cylindrically Convergent Geometry Weakly Nonlinear Rayleigh

Transition of Growth Mode in Homoepitaxy on Metal Surface

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Communications in Theoretical Physics 2007年第7期48卷 175-178页

作者： wu Li-Li LU Hang-jun wu feng-Min College of Mathematics and Physics,Information Engineering,Zhejiang Normal University,Jinhua 321004,China College of Mathematics and Physics Information Engineering Zhejiang Normal University

The process of the multilayer growth of Pt on Pt(111)is studied by using a Monte Carlo model with realisticphysical *** effects of the substrate temperature,the ES barrier,and the deposition rate on the growthmode have been *** transitions of the surface roughness from oscillatory to non-oscillatory behaviorand then back to oscillatory behavior are observed while increasing the substrate temperature from 270 K to 620 *** found that the growth mode depends strongly on ES barrier over the whole temperatures and the deposition rate ofatoms effectively affects the growth *** simulation results are consistent with many experimental observationsfor homoexpitaxy on a Pt(111)substrate.

关键词： growth mode transition Monte Carlo simulation surface roughness oscillation

Shear-thinning Catechol-modified Chitosan Hydrogel Loaded with Silver Nanoparticles for Endoscopic Submucosal Dissection

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Chinese Journal of Polymer Science 2024年第8期42卷 1147-1155页

作者： Wen-jun feng Yan-He wu Xiao-Yang Liu Zheng-Ke Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

Shear-thinning hydrogels have emerged for endoscopic submucosal dissection,while wound intervention after surgery has rarely been ***,a catechol-modified chitosa n hydrogel with shear-thinning property was developed for simultaneously facilitating endoscopic submucosal dissection and postoperative wound *** from the shear-thinning and self-healing characteristics,the asprepared hydrogel showed easily endoscopic *** also performed very well as submucosal cushion,which could remain above 70%after injection for 120 min in ex vivo porcine large intestine *** fact,the cushion height of normal saline dramatically decreased to 46%of the initial height at 30 *** nanoparticles encapsulated into the network endowed the hydrogel with almost reached 100%antibacterial effect against *** and *** hemolysis ratio of the hydrogel was calculated to be as low as 0.8%.Combined with good hemocompatibility and cytocompatibility,the as-prepared hydrogel displayed much higher in vivo wound closu re and healing efficacy than normal *** results demonstrated the superiority of the shear-thinning chitosan hydrogel in facilitating clinical endoscopic submucosal dissection surgery.

关键词： Shear-thinning hydrogel Endoscopic mucosal dissection Wound healing Catechol-modified chitosan Silver nanoparticles

Unveiling the Re,Cr,and I diffusion in saturated compacted bentonite using machine-learning methods

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Nuclear Science and Techniques 2024年第6期35卷 65-77页

作者： Zheng-Ye feng jun-Lei Tian Tao wu Guo-jun Wei Zhi-Long Li Xiao-Qiong Shi Yong-Jia Wang Qing-feng Li Department of Engineering Huzhou UniversityHuzhou 313000China Institute of Theoretical Physics Shanxi UniversityTaiyuan 030006China College of Physics Science and Technology Shenyang Normal UniversityShenyang 110034China

The safety assessment of high-level radioactive waste repositories requires a high predictive accuracy for radionuclide diffusion and a comprehensive understanding of the diffusion *** this study,a through-diffusion method and six machine-learning methods were employed to investigate the diffusion of ReO_(4)^(−),HCrO_(4)^(−),and I−in saturated compacted bentonite under different salinities and compacted dry *** machine-learning models were trained using two *** dataset contained six input features and 293 instances obtained from the diffusion database system of the Japan Atomic Energy Agency(JAEA-DDB)and 15 *** other dataset,comprising 15,000 pseudo-instances,was produced using a multi-porosity model and contained eight input *** results indicate that the former dataset yielded a higher predictive accuracy than the *** gradient-boosting exhibited a higher prediction accuracy(R2=0.92)and lower error(MSE=0.01)than the other machine-learning *** addition,Shapley Additive Explanations,Feature Importance,and Partial Dependence Plot analysis results indicate that the rock capacity factor and compacted dry density had the two most significant effects on predicting the effective diffusion coefficient,thereby offering valuable insights.

关键词： Machine learning Effective diffusion coefficient Through-diffusion experiment Multi-porosity model Global analysis

Simulation of the Weakly Nonlinear Rayleigh–Taylor Instability in Spherical Geometry

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Chinese Physics Letters 2020年第5期37卷 73-76页

作者： Yun-Peng Yang Jing Zhang Zhi-Yuan Li Li-feng Wang jun-feng wu Wen-Hua Ye Xian-Tu He School of Physics Peking UniversityBeijing 100871 Center for Applied Physics and Technology HEDPSPeking UniversityBeijing 100871 Institute of Applied Physics and Computational Mathematics Bejing 100094

The Rayleigh-Taylor instability at the weakly nonlinear(WN)stage in spherical geometry is studied by numerical *** mode coupling processes are *** results are consistent with the WN model based on parameter expansion,while higher order effects are found to be *** Legendre mode perturbation Pn(cos B),the nonlinear saturation amplitude(NSA)of the fundamental mode decreases with the mode number *** n is large,the spherical NSA is lower than the corresponding planar ***,for large n,the planar NSA can be recovered by applying Fourier transformation to the bubble/spike near the equator and calculating the NSA of the converted trigonometric harmonic.

关键词： planar spherical negligible

Interface Width Effect on the Weakly Nonlinear Rayleigh–Taylor Instability in Spherical Geometry

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Chinese Physics Letters 2020年第7期37卷 43-46页

作者： Yun-Peng Yang Jing Zhang Zhi-Yuan Li Li-feng Wang jun-feng wu wun-Hua Ye Xian-Tu He School of Physics Peking UniversityBeijing 100871China Center for Applied Physics and Technology HEDPSand College of EngineeringPeking UniversityBeijing 100871China Institute of Applied Physics and Computational Mathematics Beijing 100094China

Interface width effect on the spherical Rayleigh–Taylor instability in the weakly nonlinear regime is studied by numerical *** Legendre perturbation mode Pn with wave number Kn and interface half-width L,the commonly adopted empirical linear growth rate formulaγnem(L)=γn/√1+KnL is found to be sufficient in spherical *** the weakly nonlinear stage,the interface width affects the mode coupling *** development of the mode P2n is substantially influenced by the interface ***,the nonlinear saturation amplitude increases with the interface width.

关键词： interface nonlinear weakly