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具有隔离因素的流行病模型的免疫接种效率分析 被引量:1
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作者 魏巍 李蒙 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2013年第3期6-9,共4页
研究了脉冲接种形式下具有隔离因素的流行病模型,讨论了无病周期解的存在性,证明了该周期解的全局渐进稳定性,并给出了模型的基本再生数.最后对脉冲接种和常数接种的接种效率进行了比较.
关键词 隔离 SIQR流行病模型 常数接种 脉冲接种
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A New Fractal Model of Elastic,Elastoplastic and Plastic Normal Contact Stiffness for Slow Sliding Interface Considering Dynamic Friction and Strain Hardening 被引量:2
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作者 田红亮 陈保家 +4 位作者 何孔德 董元发 钟先友 王骁鹏 郤能 《Journal of Shanghai Jiaotong university(Science)》 EI 2017年第5期589-601,共13页
The deflection properties of elastic stage, elastoplastic stage and plastic stage of elastomer were analyzed. Taking account of the kinetic friction force in friction interface and strain hardening in slow sliding int... The deflection properties of elastic stage, elastoplastic stage and plastic stage of elastomer were analyzed. Taking account of the kinetic friction force in friction interface and strain hardening in slow sliding interface, the elastic, elastoplastic and plastic normal contact stiffness model for harsh surface was established, which revised the Majumdar-Bhushan fractal model and made it more perfect. In the combination of macro and micro perspective, the effects of coarse surface fractal variables, kinetic friction force in the friction interface, material characters of the friction couples on the contact status and contact property were discussed by the study of digital analysis. Results imply that the normal contact stiffness improves with the increasing real contact area and normal contact load, and reduces with the augment of kinetic friction coefficient. When the kinetic friction coefficient is smaller than 0.3, the normal contact stiffness comprises a linear decrease with the increment of kinetic friction coefficient. When the kinetic friction coefficient is bigger than 0.3, the normal contact stiffness has an exponential decrease with the increasing kinetic friction coefficient. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany. 展开更多
关键词 Elastoplasticity Fractals HARDENING Interfaces (materials) Kinetics STIFFNESS Strain hardening TRIBOLOGY
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