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The effect of low fluoride concentrations on microdamage accumulation in mouse tibias under impact loading
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作者 Qing Luo Nan Chen +1 位作者 Yan-Heng Zhou Qi-Guo Rong 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2015年第6期944-951,共8页
Microdamage accumulation in bone is one of the mechanisms for energy dissipation during the fracture process. Changes in the ultrastructure and composition of bone constituents due to aging or diseases could affect mi... Microdamage accumulation in bone is one of the mechanisms for energy dissipation during the fracture process. Changes in the ultrastructure and composition of bone constituents due to aging or diseases could affect microdamage accumulation. Low concentration (1 mM) of sodium fluoride (NaF) has been used in this study to investigate the effect of ultrastructural changes on microdamage accumu- lation in mouse tibias following free-fall impact loadings. Twenty-two tibias were divided randomly into control and NaF-treated groups. Free-fall impact loading was conducted twice on each tibia to produce microdamage. The elas- tic modulus of NaF-treated tibias decreased significantly after the impact loadings, while there was no significant difference in the modulus of untreated samples between pre- and post-damage loadings. Microdamage morphology analysis showed that less and shorter microcracks existed in NaF-treated tibias compared with control bones. Meanwhile, more and longer microcracks were observed in tensile regions in untreated samples compared with that in compressive regions, whereas no significant difference was observed between tensile and compressive regions in NaF-treated bones. The results of this study indicate that more energy is required to generate microcracks in NaF-treated bone than in normal bone. A low concentration of fluoride treatment may increase the toughness of bone under impact loading. 展开更多
关键词 Microdamage accumulation · Fluoridetreatment · Ultrastructural changes · Free-fall impact
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Gravity anomaly before the Leshan M5.0 earthquake? 被引量:1
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作者 Wei Jin Liu Ziwei +3 位作者 Sun Shaoan Kang Kaixuan Shen Chongyang Li Hui 《Geodesy and Geodynamics》 2015年第2期101-105,共5页
The North-South Seismic Belt was analyzed using gravity observation data from 2011 to 2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations ... The North-South Seismic Belt was analyzed using gravity observation data from 2011 to 2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations one month before the Leshan M5.0 earthquake. 展开更多
关键词 Gravity gradient Continuous gravity observations Nonlinear gravity change Leshan M5.0 earthquake Mobile gravity observation network accumulation gravity change Different gravity change North-South Seismic Belt
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