经颅直流电刺激(transcranial direct current stimulation,tDCS)是一种能够改变人体运动能力的无创伤脑刺激技术,以往有研究表明,在初级运动皮质区施加tDCS刺激能够提高健康人群和临床患者复杂的运动水平。尽管效果显著,但一般情况下,...经颅直流电刺激(transcranial direct current stimulation,tDCS)是一种能够改变人体运动能力的无创伤脑刺激技术,以往有研究表明,在初级运动皮质区施加tDCS刺激能够提高健康人群和临床患者复杂的运动水平。尽管效果显著,但一般情况下,常规的tDCS技术还处于实验室水平,不利于运动员运动训练的实际应用。目前,美国Halo Neuroscience公司基于tDCS技术原理研发了一款便携式神经电刺激运动耳机HaloSport。国外已有人将其应用到竞赛场地之中,但国内关于Halo Sport增强运动表现的研究甚少。展开更多
Based on laboratory results of time-dependent mechanical behavior tests,we investigated short-term and mechanical creep behavior of sandstone,observed in conventional triaxial compression experiments at room temperatu...Based on laboratory results of time-dependent mechanical behavior tests,we investigated short-term and mechanical creep behavior of sandstone,observed in conventional triaxial compression experiments at room temperature,using a servo-controlled rheology testing machine.Given our short-term experimental test results,we confirmed deviatoric creep stress levels of sandstone.Multiple deviatoric stress levels were applied in steps to each sample.Each deviatoric stress level before the final failed deviatoric stress was maintained for 48 h or longer.Time-dependent variations of axial strains of sandstone samples are discussed and evaluated.During the creep tests,complete tertiary creep curves of sandstone were observed under failed deviatoric stress levels with different confining pressures.Slices of coal in sandstone samples can lead to distinct tertiary creep deformation failure.展开更多
文摘经颅直流电刺激(transcranial direct current stimulation,tDCS)是一种能够改变人体运动能力的无创伤脑刺激技术,以往有研究表明,在初级运动皮质区施加tDCS刺激能够提高健康人群和临床患者复杂的运动水平。尽管效果显著,但一般情况下,常规的tDCS技术还处于实验室水平,不利于运动员运动训练的实际应用。目前,美国Halo Neuroscience公司基于tDCS技术原理研发了一款便携式神经电刺激运动耳机HaloSport。国外已有人将其应用到竞赛场地之中,但国内关于Halo Sport增强运动表现的研究甚少。
基金Projects 50709008 and 50539110 are supported by the National Natural Science Foundation of China.
文摘Based on laboratory results of time-dependent mechanical behavior tests,we investigated short-term and mechanical creep behavior of sandstone,observed in conventional triaxial compression experiments at room temperature,using a servo-controlled rheology testing machine.Given our short-term experimental test results,we confirmed deviatoric creep stress levels of sandstone.Multiple deviatoric stress levels were applied in steps to each sample.Each deviatoric stress level before the final failed deviatoric stress was maintained for 48 h or longer.Time-dependent variations of axial strains of sandstone samples are discussed and evaluated.During the creep tests,complete tertiary creep curves of sandstone were observed under failed deviatoric stress levels with different confining pressures.Slices of coal in sandstone samples can lead to distinct tertiary creep deformation failure.
