Fretting in the partial-slip and gross-slip regimes under a constant normal load is considered.The tangential force-displacement relations for the forward and backward motions are described based the generalized Catta...Fretting in the partial-slip and gross-slip regimes under a constant normal load is considered.The tangential force-displacement relations for the forward and backward motions are described based the generalized Cattaneo-Mindlin theory of tangential contact and Masing's hypothesis on modelling the force-displacement hysteretic loop.Besides the critical force and displacement parameters(characterizing the triggering of sliding),the model includes one dimensionless fitting parameter that tunes the tangential contact stiffness of the friction-contact interface.Explicit expressions are derived for the main tribological parameters of the fretting loop,including the slip index and the signal index.The presented phenomenological modelling approach has been applied to the analysis of two sets of experimental data taken from the literature.It has been shown that the experimentally observed simple relation of a rational type between the slip index and the slip ratio corresponds to the gross-slip asymptotics of the corresponding model-based predicted relation.The known quantitative criteria for the transition from the partial slip regime to the gross slip regime are expressed in terms of the stiffness parameter,and a novel geometric transition criterion is formulated.展开更多
目的比较进行改良ECT（Modified Electric Convulsive Therapy简称MECT）治疗时能量百分比的选择是否存在性别差异。方法对2004年3月至2005年3月我院ECT室接受治疗的88例、656人次男性患者和73例，453人次女性患者进行比较。能量百分比...目的比较进行改良ECT（Modified Electric Convulsive Therapy简称MECT）治疗时能量百分比的选择是否存在性别差异。方法对2004年3月至2005年3月我院ECT室接受治疗的88例、656人次男性患者和73例，453人次女性患者进行比较。能量百分比从10％～100％，以5％能量百分比为一个能量百分比增加值。在每一能量百分比下将患者分成男女两组。进而根据衡量一次改良ECT是否发作完全的3项指标（①EEG endpoint；②SEI；③PSI）之2或2项以上再将患者分为完全组和不完全组两组。结果男、女患者在进行改良ECT治疗时能量百分比选择无差异。结论改良ECT治疗时若患者年龄和体重指数无统计学差异时，治疗能量百分比的选择无性别差异。展开更多
基金supported by the 2021 Yeungnam University Research Grant.
文摘Fretting in the partial-slip and gross-slip regimes under a constant normal load is considered.The tangential force-displacement relations for the forward and backward motions are described based the generalized Cattaneo-Mindlin theory of tangential contact and Masing's hypothesis on modelling the force-displacement hysteretic loop.Besides the critical force and displacement parameters(characterizing the triggering of sliding),the model includes one dimensionless fitting parameter that tunes the tangential contact stiffness of the friction-contact interface.Explicit expressions are derived for the main tribological parameters of the fretting loop,including the slip index and the signal index.The presented phenomenological modelling approach has been applied to the analysis of two sets of experimental data taken from the literature.It has been shown that the experimentally observed simple relation of a rational type between the slip index and the slip ratio corresponds to the gross-slip asymptotics of the corresponding model-based predicted relation.The known quantitative criteria for the transition from the partial slip regime to the gross slip regime are expressed in terms of the stiffness parameter,and a novel geometric transition criterion is formulated.
文摘目的比较进行改良ECT（Modified Electric Convulsive Therapy简称MECT）治疗时能量百分比的选择是否存在性别差异。方法对2004年3月至2005年3月我院ECT室接受治疗的88例、656人次男性患者和73例，453人次女性患者进行比较。能量百分比从10％～100％，以5％能量百分比为一个能量百分比增加值。在每一能量百分比下将患者分成男女两组。进而根据衡量一次改良ECT是否发作完全的3项指标（①EEG endpoint；②SEI；③PSI）之2或2项以上再将患者分为完全组和不完全组两组。结果男、女患者在进行改良ECT治疗时能量百分比选择无差异。结论改良ECT治疗时若患者年龄和体重指数无统计学差异时，治疗能量百分比的选择无性别差异。
