Even though the slipperiness of ice is important both technologically and environmentally and often experienced in everyday life,the nanoscale processes determining ice friction are still unclear.We study the friction...Even though the slipperiness of ice is important both technologically and environmentally and often experienced in everyday life,the nanoscale processes determining ice friction are still unclear.We study the friction of a smooth ice-ice interface using atomistic simulations,and especially consider the effects of temperature,load,and sliding velocity.At this scale,frictional behavior is seen to be determined by the lubricating effect of a liquid premelt layer between the sliding ice sheets.In general,increasing temperature or load leads to a thicker lubricating layer and lower friction,while increasing the sliding velocity increases friction due to viscous shear.展开更多
GREENHOUSE gases such as CH<sub>4</sub> in the ancient atmospheric concentration can be reconstructed by extracting and analyzing the gases trapped in polar ice core bubbles. It is a new attempt to extract...GREENHOUSE gases such as CH<sub>4</sub> in the ancient atmospheric concentration can be reconstructed by extracting and analyzing the gases trapped in polar ice core bubbles. It is a new attempt to extract and analyze the CH<sub>4</sub> concentration in Dunde ice core for the study of mountain glacier. Samples were taken from the about 140-m ice core drilled in 1987 in Dunde ice cap in Qilian Mountain. The ice core has been well preserved in cold room. 12 samples were taken from the upper 95 m, and cut to 15 cm in length and 5cm in diameter. CH<sub>4</sub> concentrations were measured in CNRS Laboratory of Glaciology, Grenoble, France.展开更多
基金the Academy of Finland through its Centres of Excellence Program(project no.251748).
文摘Even though the slipperiness of ice is important both technologically and environmentally and often experienced in everyday life,the nanoscale processes determining ice friction are still unclear.We study the friction of a smooth ice-ice interface using atomistic simulations,and especially consider the effects of temperature,load,and sliding velocity.At this scale,frictional behavior is seen to be determined by the lubricating effect of a liquid premelt layer between the sliding ice sheets.In general,increasing temperature or load leads to a thicker lubricating layer and lower friction,while increasing the sliding velocity increases friction due to viscous shear.
文摘GREENHOUSE gases such as CH<sub>4</sub> in the ancient atmospheric concentration can be reconstructed by extracting and analyzing the gases trapped in polar ice core bubbles. It is a new attempt to extract and analyze the CH<sub>4</sub> concentration in Dunde ice core for the study of mountain glacier. Samples were taken from the about 140-m ice core drilled in 1987 in Dunde ice cap in Qilian Mountain. The ice core has been well preserved in cold room. 12 samples were taken from the upper 95 m, and cut to 15 cm in length and 5cm in diameter. CH<sub>4</sub> concentrations were measured in CNRS Laboratory of Glaciology, Grenoble, France.
