This paper is concerned with the transient deformation of functionally graded （FG） shallow spherical shells subjected to time-dependent thermomechanical load. Based on Timoshenko- Mindlin hypothesis and yon Karman n...This paper is concerned with the transient deformation of functionally graded （FG） shallow spherical shells subjected to time-dependent thermomechanical load. Based on Timoshenko- Mindlin hypothesis and yon Karman nonlinear theory, a set of nonlinear governing equations of motion for FG shallow spherical shells in regard to transverse shear deformation and all the inertia terms are established using Hamilton＇s principle. The collocation point method and Newmark- beta scheme in conjunction with the finite difference method are adopted to solve the governing equations of motion and the unsteady heat conduction equation numerically. In the numerical examples, the transient deflection and stresses of FG shallow spherical shells with various material properties under different loading conditions are presented.展开更多
Growing evidence links atmospheric PM2.5 pollution to the onset and progression of allergic diseases,yet this connection remains underexplored.This study examines how various sources and components of PM2.5 contribute...Growing evidence links atmospheric PM2.5 pollution to the onset and progression of allergic diseases,yet this connection remains underexplored.This study examines how various sources and components of PM2.5 contribute to allergic disease mechanisms.Integrating findings from epidemiological studies,animal and cellular experiments,and clinical research,we elucidate potential mechanisms underlying PM2.5-induced and exacerbated allergic responses.Additionally,we review current treatment approaches for PM2.5-related allergic conditions,encompassing both traditional Chinese and modern medical practices.This study aims to deepen understanding of PM2.5-induced allergic disease mechanisms and provide a foundation for future targeted therapies.展开更多
基金supported by the National Natural Science Foundation of China(No.11072076)
文摘This paper is concerned with the transient deformation of functionally graded （FG） shallow spherical shells subjected to time-dependent thermomechanical load. Based on Timoshenko- Mindlin hypothesis and yon Karman nonlinear theory, a set of nonlinear governing equations of motion for FG shallow spherical shells in regard to transverse shear deformation and all the inertia terms are established using Hamilton＇s principle. The collocation point method and Newmark- beta scheme in conjunction with the finite difference method are adopted to solve the governing equations of motion and the unsteady heat conduction equation numerically. In the numerical examples, the transient deflection and stresses of FG shallow spherical shells with various material properties under different loading conditions are presented.
基金supported by the National Natural Science Foundation of China(12105313,12435020)Fundamental Research Funds for the Central Universities(2023-JYB-XJSJJ-004).
文摘Growing evidence links atmospheric PM2.5 pollution to the onset and progression of allergic diseases,yet this connection remains underexplored.This study examines how various sources and components of PM2.5 contribute to allergic disease mechanisms.Integrating findings from epidemiological studies,animal and cellular experiments,and clinical research,we elucidate potential mechanisms underlying PM2.5-induced and exacerbated allergic responses.Additionally,we review current treatment approaches for PM2.5-related allergic conditions,encompassing both traditional Chinese and modern medical practices.This study aims to deepen understanding of PM2.5-induced allergic disease mechanisms and provide a foundation for future targeted therapies.
