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Simple preparation of C(CS)/g-C_(3)N_(4)/Co carbon aerogel and its catalytic performance for ammonium perchlorate

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Defence Technology（防务技术） 2024年第3期33卷 186-196页

作者： Yujie Yan bo jin Rufang Peng State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Biomass chitosan(CS)was used as a template,graphitic phase carbon nitride(g-C_(3)N_(4))with high nitrogen content and certain catalytic activity was used as a dopant,and nano-transition metal cobalt(Co)was used as a catalytic center *** carbon aerogel(C(CS)/g-C_(3)N_(4)/Co)with a three-dimensional network-like structure was prepared by assembling the three materials through experimental operations such as freeze-drying and high-temperature *** was demonstrated by scanning and transmission characterization that the CS in the carbon aerogel could provide more active sites for the cobalt nanoparticles,and the doping of graphite-phase carbon nitride as a template dispersed the cobalt nanoparticles and changed the conductivity of the *** investigate the catalytic effect of carbon aerogel on ammonium perchlorate(AP),it was investigated by differential thermal analyzer and TG thermal *** carbon aerogel was very effective in catalyzing AP,and the 10 wt% content of the catalyst reduced the AP pyrolysis peak from 703.9 to 595.5 *** to further investigate the synergistic effect of the three materials,further carbon aerogels such as C(CS)/Co,g-C_(3)N_(4)/Co were prepared and applied to catalyze AP,and the same ratio reduced the AP pyrolysis peak by 98.1℃ and 97.7℃.This result indicates a synergistic effect of the assembly of the three materials.

关键词： g-C_(3)N_(4) Chitosan Co Ammonium perchlorate Pyrolysis kinetics

Dynamic response of a poroelastic stratum to moving oscillating load

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Science China(Physics,Mechanics & Astronomy) 2008年第7期51卷 883-893页

作者： CHEN YuanGuo jin bo School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

The dynamic response of a poroelastic stratum subjected to moving load is studied. The governing dynamic equations for poroelastic medium are solved by using Fourier transform. The general solutions for the stresses and displacements in the transformed domain are established. Based on the general solutions, with the consideration of boundary conditions, the final expressions of stresses and displacements in physical domain are put forward for the three-dimensional single-layer medium. Some numerical solutions for the stresses, displacements and pore fluid pressure are presented and reveal that the response of a poroelastic stratum varies obviously with the moving velocity.

关键词： poroelastic stratum Biot’s dynamic equation Fourier transform moving oscillating load

Finite element method for coupled diffusion-deformation theory in polymeric gel based on slip-link model

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Applied Mathematics and Mechanics(English Edition) 2018年第4期39卷 581-596页

作者： Hengdi SU Huixian YAN bo jin School of Aerospace Engineering and Applied Mechanics Tongji University School of Mechanical and Electrical Engineering Sanming University

A polymeric gel is an aggregate of polymers and solvent molecules, which can retain its shape after a large deformation. The deformation behavior of polymeric gels was often described based on the Flory-Rehner free energy function without considering the influence of chain entanglements on the mechanical behavior of gels. In this paper,a new hybrid free energy function for gels is formulated by combining the EdwardsVilgis slip-link model and the Flory-Huggins mixing model to quantify the time-dependent concurrent process of large deformation and mass transport. The finite element method is developed to analyze examples of swelling-induced deformation. Simulation results are compared with available experimental data and show good agreement. The influence of entanglements on the time-dependent deformation behavior of gels is also *** study of large deformation kinetics of polymeric gel is useful for diverse applications.

关键词： polymeric gel finite element method slip-link model large deformation mass transport kinetics

Yb^(3+)-and Er^(3+)-doped Y_(2)O_(3) microcrystals for upconversion photoluminescence and energy transfer with enhancements of near-ultraviolet emission

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Rare Metals 2021年第1期40卷 123-127页

作者： jin-bo Zhao Li-Li Wu School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Liquid-Solid Structural Evolution and Process of Materials(Ministry of Education) Shandong UniversityJinan 250061China School of Materials Science and Engineering Shandong UniversityJinan 250061China

Yb^(3+)and Er^(3+)were doped into Y_(2)O_(3) to form Y_(2)O_(3):Yb^(3+),Er^(3+)*** effect of doping concentration of Yb^(3+)was *** near-ultraviolet(UV)upconversion(UC)emission spectra of Y_(2)O_(3):Yb^(3+),Er^(3+)were studied under 1.55-μm *** near-UV UC emissions centered at 391 and 418 nm were enhanced by Yb^(3+)under 1.55-μm laser ***^(3+)generally acts as activator and is not used as sensitizer in the reference Er^(3+)-doped *** the present upconversion process under the 1.55-μm laser excitation,the energy transfer from Er^(3+)to Yb^(3+)and then Yb^(3+)to Er^(3+)was *** Er^(3+)acted as not only activator but also *** energy transfer between Er^(3+)and Yb^(3+)enhanced the near-UV UC emission of our materials.

关键词： Upconversion Photoluminescence Y_(2)O_(3):Yb^(3+)/Er^(3+) 1.55-μm excitation Optical materials and properties

Premature thermal decomposition behavior of 3,4-dinitrofurazanfuroxan with certain types of nitrogen-rich compounds

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Defence Technology（防务技术） 2023年第8期26卷 102-110页

作者： Jiao Huang Ru-fang Peng bo jin State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang621010SichuanPR China

3,4-Dinitrofurazanfuroxan(DNTF),as a high-energy-density material,features good thermal stability and wide *** study aimed to elucidate the thermal decomposition mechanism of DNTF combined with nitrogen-rich compounds containing *** thermal stabilities of DNTF and its hybrid systems were investigated using differential thermal analysis/thermogravimetry(TG),vacuum stability test,and accelerating rate calorimetry under isothermal,non-isothermal,and adiabatic conditions,*** showed that the thermal stability and thermal safety of DNTF significantly decreased after combining with nitrogen-rich compounds containing *** results showed that the activation energy of the DNTF hybrid systems was significantly lower than that of *** TGIR was used to monitor the generation of fugitive gases during the thermal decomposition of the DNTF/5-aminotetrazole(5-ATZ)***,the nitrogen-rich molecules containing N-H interacted extensively with DNTF,and this interaction accelerated the thermal degradation of DNTF.

关键词： DNTF NeH rich Nitrogen compounds Advanced thermal decomposition peak

Stability of Entropy Solution of Conservation Law Systems on Flow Function and Relaxation Function

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 747-757页

作者： jin-bo GENG Xu-dong WANG College of Mathematics and Computer Science Zhejiang Normal UniversityJinhua321004China School of Mathematical Sciences Fudan UniversityShanghai200433China

In this paper,using the fractional step Lax-Friedrichs difference scheme,we establish the stability of the entropy solution on flow function and relaxation function for a class of conservation law systems with a sourc... 详细信息

关键词： stability Lax-Friedrichs difference scheme conservation law entropy solution

Priestley Spaces,Quasi-hyperalgebraic Lattices and Smyth Powerdomains

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Acta Mathematica Sinica,English Series 2006年第3期22卷 951-958页

作者： jin bo YANG Mao Kang LUO Institute of Mathematics Sichuan University Yangtze Center of Mathematics Sichuan University

We introduce the concept of quasi-hyperalgebraic lattice and prove that a complete lattice is a Priestley space with respect to the interval topology if and only if it is quasi-hyperalgebraic. Some characterizations of quasi-hyperalgebraic lattices are presented. We also prove that the Smyth powerdomain of a quasi-hyperalgebraic lattice is hyperalgebraic.

关键词： Priestley space quasi-hyperalgebraic lattice hypercontinuous lattice hyperalgebraic lattice Smyth powerdomain

INTERACTION OF A DISLOCATION DIPOLE WITH A MODE III INTERFACE CRACK

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Acta Mechanica Solida Sinica 2007年第1期20卷 50-56页

作者： jin bo Fang Qihong Liu Youwen College of Civil Engineering Hunan University Changsha 410082 China College of Mechanics and Aerospace Hunan University Changsha 410082 China

Interaction between a screw dislocation dipole and a mode III interface crack is investigated. By using the complex variable method, the closed form solutions for complex potentials are obtained when a screw dislocation dipole lies inside a medium. The stress fields and the stress intensity factors at the tip of the interface crack produced by the screw dislocation dipole are given. The influence of the orientation, the dipole arm and the location of the screw dislocation dipole as well as the material mismatch on the stress intensity factors is discussed. The image force and the image torque acting on the screw dislocation dipole center are also calculated. The mechanical equilibrium position of the screw dislocation dipole is examined for various material property combinations and crack geometries. The results indicate that the shielding or anti-shielding effect on the stress intensity factor increases abruptly when the dislocation dipole approaches the tip of the crack. Additionally, the disturbation of the interface crack on the motion of the dislocation dipole is also significant.

关键词： dislocation dipole interface crack image force image torque

A Modified Landweber Iteration for General Sideways Parabolic Equations

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Acta Mathematicae Applicatae Sinica 2011年第4期27卷 727-738页

作者： jin-bo LIU You-jun DENG Department of Mathematics Changsha University of Science and Technology Changsha 410076 China School of Mathematical Sciences and Computing Technology Central South University Changsha Hunan 410075China

Abstract In this paper, we introduce a modified Landweber iteration to solve the sideways parabolic equation, which is an inverse heat conduction problem （IHCP） in the quarter plane and is severely ill-posed. We shall show that our method is of optimal order under both a priori and a posteriori stopping rule. Furthermore, if we use the discrepancy principle we can avoid the selection of the a priori bound. Numerical examples show that the computation effect is satisfactory.

关键词： inverse heat conduction problem sideways parabolic equation Landweber iteration,discrepancy principle