Recurring Slope Lineae(RSL)are seasonally observed dark streaks on the Martian surface that exhibit distinct spatial and temporal distribution characteristics.Exploring their formation mechanisms can deepen our unders...Recurring Slope Lineae(RSL)are seasonally observed dark streaks on the Martian surface that exhibit distinct spatial and temporal distribution characteristics.Exploring their formation mechanisms can deepen our understanding of surface activity on Mars and provide scientific basis for future Mars exploration.This study aims to gain a comprehensive understanding of the spatial and temporal distribution characteristics and formation mechanisms of RSL by reviewing relevant literature and synthesizing various viewpoints and experimental results.RSL typically appear during warm seasons,disappear during cold seasons,and repeat over multiple Martian years.The formation mechanisms can be broadly categorized into three types:dry mode,wet mode,and mixed mode.However,a definitive explanation for the formation of RSL is still lacking,and both the dry and wet models have their respective limitations.It is likely that the formation of RSL is the result of the combined action of multiple mechanisms.The next step should be to search for terrestrial analogs of RSL and conduct research at high spatial and temporal resolutions to understand the forming processes of RSL.展开更多
Recent attention has been put into recurring slope lineae (RSL), after the discovery that water is present in them. It is assumed that RSL are due to flowing water. However, even though that might be the case, the gen...Recent attention has been put into recurring slope lineae (RSL), after the discovery that water is present in them. It is assumed that RSL are due to flowing water. However, even though that might be the case, the general characteristics of RSL as well as their seasonal and spatial distribution in Mars, and their occurrence within craters, suggest that RSL correspond to the weathering of frozen aquifers, which coincides with slope stability processes occurring in impact craters and scree slopes from Earth. In this study, we associated RSL with similar weathering processes occurring on impact craters and hydrogeological processes occurring on Earth (including ice, water, and wind erosion and natural aquifer recharge processes). We were able to create a conceptual model on how RSL develop, why are they found mostly in mid latitudes around craters, why are they present in more frequency in one side of crates in high latitudes, and why are there more RSL in the Martian southern hemisphere. Considering the whole hydrogeological processes occurring in craters that experience RSL, we were able to predict where large quantities of liquid water are most likely to be present in the red planet.展开更多
Great changes have brought about the shrinkage of the Earth in effect,it became a global village. In this situation,it will be better if we could know something about our business partner or someone else with a differ...Great changes have brought about the shrinkage of the Earth in effect,it became a global village. In this situation,it will be better if we could know something about our business partner or someone else with a different cultural background. By the processing of learning,we could see the deep reason,appreciate the diversity of cultures,respect the differences,anticipate the potential problems in intercultural communicates and improve the ability to deal with them.展开更多
Automorphisms of 2-dimensional linear groups over the skew-field (or field)have already been given by Hua Lnogeng and Wan Zhixian. Reiner, Landin, Dull et al. have made researches on the automorphisms of the 2-dimensi...Automorphisms of 2-dimensional linear groups over the skew-field (or field)have already been given by Hua Lnogeng and Wan Zhixian. Reiner, Landin, Dull et al. have made researches on the automorphisms of the 2-dimensional linear groups over some Euclidean rings and general integral domains. Not long ago, Wang Renfa worked out the automorphisms of 2-dimensional linear groups over local rings. On this basis, we tried to give the automor-展开更多
The statistical significance of positive result observed in searching discrete gamma-ray source or gamma-ray line has so far been overestimated in many reports, because the statistical factors in an observation result...The statistical significance of positive result observed in searching discrete gamma-ray source or gamma-ray line has so far been overestimated in many reports, because the statistical factors in an observation result are not thoroughly considered. Hearn suggested a relative likelihoed method for analysing observation in gamma-ray astronomy in 1969. Since then some astronomers have taken this approach as a standard method of展开更多
基金Supported by the National Natural Science Foundation(No.42272340).
文摘Recurring Slope Lineae(RSL)are seasonally observed dark streaks on the Martian surface that exhibit distinct spatial and temporal distribution characteristics.Exploring their formation mechanisms can deepen our understanding of surface activity on Mars and provide scientific basis for future Mars exploration.This study aims to gain a comprehensive understanding of the spatial and temporal distribution characteristics and formation mechanisms of RSL by reviewing relevant literature and synthesizing various viewpoints and experimental results.RSL typically appear during warm seasons,disappear during cold seasons,and repeat over multiple Martian years.The formation mechanisms can be broadly categorized into three types:dry mode,wet mode,and mixed mode.However,a definitive explanation for the formation of RSL is still lacking,and both the dry and wet models have their respective limitations.It is likely that the formation of RSL is the result of the combined action of multiple mechanisms.The next step should be to search for terrestrial analogs of RSL and conduct research at high spatial and temporal resolutions to understand the forming processes of RSL.
文摘Recent attention has been put into recurring slope lineae (RSL), after the discovery that water is present in them. It is assumed that RSL are due to flowing water. However, even though that might be the case, the general characteristics of RSL as well as their seasonal and spatial distribution in Mars, and their occurrence within craters, suggest that RSL correspond to the weathering of frozen aquifers, which coincides with slope stability processes occurring in impact craters and scree slopes from Earth. In this study, we associated RSL with similar weathering processes occurring on impact craters and hydrogeological processes occurring on Earth (including ice, water, and wind erosion and natural aquifer recharge processes). We were able to create a conceptual model on how RSL develop, why are they found mostly in mid latitudes around craters, why are they present in more frequency in one side of crates in high latitudes, and why are there more RSL in the Martian southern hemisphere. Considering the whole hydrogeological processes occurring in craters that experience RSL, we were able to predict where large quantities of liquid water are most likely to be present in the red planet.
文摘Great changes have brought about the shrinkage of the Earth in effect,it became a global village. In this situation,it will be better if we could know something about our business partner or someone else with a different cultural background. By the processing of learning,we could see the deep reason,appreciate the diversity of cultures,respect the differences,anticipate the potential problems in intercultural communicates and improve the ability to deal with them.
文摘Automorphisms of 2-dimensional linear groups over the skew-field (or field)have already been given by Hua Lnogeng and Wan Zhixian. Reiner, Landin, Dull et al. have made researches on the automorphisms of the 2-dimensional linear groups over some Euclidean rings and general integral domains. Not long ago, Wang Renfa worked out the automorphisms of 2-dimensional linear groups over local rings. On this basis, we tried to give the automor-
文摘The statistical significance of positive result observed in searching discrete gamma-ray source or gamma-ray line has so far been overestimated in many reports, because the statistical factors in an observation result are not thoroughly considered. Hearn suggested a relative likelihoed method for analysing observation in gamma-ray astronomy in 1969. Since then some astronomers have taken this approach as a standard method of
