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How do Cats Resist Landing Injury:Insights into the Multi-level Buffering Mechanism

Journal of Bionic Engineering 2020年第3期17卷 600-610页

作者： Xueqing Wu Baoqing Pei Yuyang Pei Wei Wang Yan Hao Kaiyuan Zhou School of Biological Science and Medical Engineering Beihang UniversityBeijing 100083China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100083China School of Public Health Nanjing Medical UniversityNanjing 211166China

When humans jump down from a high position,there is a risk of serious injury to the lower ***,cats can jump down from the same heights without any injury because of their excellent ability to attenuate impact *** present study aims to investigate the macro/micro biomechanical features of paw pads and limb bones of cats,and the coordination control of joints during landing,providing insights into how cats protect themselves from landing ***,histological analysis,radiological analysis,finite element method,and mechanical testing were performed to investigate the mechanical properties,microstructure,and biomechanical response of the pads and limb *** addition,using a motion capture system,the kinematic/kinetic data during landing were analysed based on inverse *** results show that the pads and limb bones are major contributors to non-impact-injuries,and cats actively couple their joints to adjust the parameters of movement to dissipate the higher ***,the paw pads,limb bones,and coordinated joints complement each other and constitute a multi-level buffering mechanism,providing the cat with the sophisticated shock absorption *** biomechanical analysis can accordingly provide biological inspiration for new approaches to prevent human lower limb injuries.

关键词： cat multi-level buffering paw pads limb bones coordinated joints

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Energetic Evolution of Single-Crystalline ZnO Nanowires and Nanotubes

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Chinese Physics Letters 2010年第8期27卷 139-142页

作者：李丽娟赵明文季燕菊李峰刘向东 School of Engineering Shandong Institute of Commerce and Technology Jinan 250103 School of Physics Shandong University Jinan 250100 School of Science Shandong Jianzhu University ginan 250101 School of Physics and Electronic Engineering Taishan University Taian 271021

We report the formation energies of wurtzite zinc oxide （w-ZnO） nanowires （NWs） and nanotubes （NTs） with faceted morphologies, and show that hexagonal NWs （h-NWs） are energetically advantageous over the NWs with rhombic （r-）, squared （s-）, and triangular （t-） cross sections. The formation energies of h-NWs are proportional to the inverse of wire radius, whereas those of single-crystalline NTs are proportional to the inverse of wall thickness, irrespectively to tube radius. A simple model is presented to interpret these features.

关键词： Energy limb bones ZnO

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