Traditionally,patch-based analysis at the landscape scale fragmentation has been used in the study of landscape ecology while the study of boundary and node has not been considered as much detail until recently.This s...Traditionally,patch-based analysis at the landscape scale fragmentation has been used in the study of landscape ecology while the study of boundary and node has not been considered as much detail until recently.This study investigated the possibility of applying boundary-and node-based methods in landscape pattern analysis to the upper reaches of the Minjiang River in the southwestern China.Boundary-based and node-based landscape indices were selected to be used in analyzing changes in landscape patterns,and the results were compared with analysis using traditional pattern indices.We compared the responses of patch-area-based,boundary-length-based and node-number-based indices,and concluded that boundary-based and node-based indices are more sensitive to disturbance than patch-based indices with various patterns,and node-based indices are even more sensitive than boundary-based ones.Thus,the results suggest that boundary-based and node-based pattern analysis methods provide helpful supplementary information to traditional patch-based pattern analysis methods.The results about pattern dynamics of landscapes in the upper reaches of the Minjiang River based on boundaries and nodes showed that with human disturbance,the dominance of forest landscape was weakened by other landscape types;thus the landscape pattern of the study area became more homogeneous and the boundary network became more complex.These changes further augmented disturbance interfaces in the landscape and increased the possibilities of further landscape fragmentation.展开更多
THE Double Ninth Festival falls on the ninth day of the ninth lunar month.Chinese ancients believed that nine was the largest number.According to the yin/yang dichotomy that forms the basis of the Chinese view of the ...THE Double Ninth Festival falls on the ninth day of the ninth lunar month.Chinese ancients believed that nine was the largest number.According to the yin/yang dichotomy that forms the basis of the Chinese view of the world,yin represents the elements of darkness and yang represents life and brightness.The number nine is regarded as yang.展开更多
This review presents some of the latest achievements in sea fog research,including fog climatology,fog structure in the marine atmospheric boundary layer,and numerical simulations and forecasting of fog.With the devel...This review presents some of the latest achievements in sea fog research,including fog climatology,fog structure in the marine atmospheric boundary layer,and numerical simulations and forecasting of fog.With the development of atmospheric observational techniques and equipments,new facts about sea fog are revealed.The mechanisms involved in the formation,development and dissipation of sea fog are further explored with the help of advanced atmospheric models.展开更多
Remote sensing, which came into being at the first International Symposium on Remote Sensing of Environment (ISRSE) 50 years ago, has enabled people to obtain objecive and realistic spatial and temporal information th...Remote sensing, which came into being at the first International Symposium on Remote Sensing of Environment (ISRSE) 50 years ago, has enabled people to obtain objecive and realistic spatial and temporal information through the application of Earth observation technologies and analyze and understand the macro-level changes of the Earth system from a spaial view. The technology of Earth observaion from space has incomparable advantages in the study of the Earth. This aricle introduces the 50-year development of Earth observaion in the world and the 30-year development of Earth observaion in China and reflects on the building of China's Earth observaion system.展开更多
Marx probed into the laws of the evolution of world history and the international system from the perspective of grand history,incisively revealing the inherent historical dynamics and evolutionary secrets of the laws...Marx probed into the laws of the evolution of world history and the international system from the perspective of grand history,incisively revealing the inherent historical dynamics and evolutionary secrets of the laws of this development and thus providing a new analytical framework for our understanding of the nature of international relations and the characteristics of the era.Compared with related international relations theories of the same period,Marx’s international outlook had a unique class standpoint and methodological principles and adopted rigorous speculative logic and lofty values.Marx conducted scientific research and dialectical analysis of the laws of evolution and the intrinsic nature of international society,especially the historical mission of the proletariat.These ideas,unique in the intellectual and theoretical spectrum of international relations,provide an intellectual guide for the innovation of Chinese diplomatic theory in the new era.展开更多
University students from China and the United States meet in New York to find common ground and share ideas What will the world look like in 2020？According to many international relations observers,in four years’tim...University students from China and the United States meet in New York to find common ground and share ideas What will the world look like in 2020？According to many international relations observers,in four years’time,China will be world’s leading economy,展开更多
基金Under the auspices of Major State Basic Research Development Program of China(No.2006CB403201)
文摘Traditionally,patch-based analysis at the landscape scale fragmentation has been used in the study of landscape ecology while the study of boundary and node has not been considered as much detail until recently.This study investigated the possibility of applying boundary-and node-based methods in landscape pattern analysis to the upper reaches of the Minjiang River in the southwestern China.Boundary-based and node-based landscape indices were selected to be used in analyzing changes in landscape patterns,and the results were compared with analysis using traditional pattern indices.We compared the responses of patch-area-based,boundary-length-based and node-number-based indices,and concluded that boundary-based and node-based indices are more sensitive to disturbance than patch-based indices with various patterns,and node-based indices are even more sensitive than boundary-based ones.Thus,the results suggest that boundary-based and node-based pattern analysis methods provide helpful supplementary information to traditional patch-based pattern analysis methods.The results about pattern dynamics of landscapes in the upper reaches of the Minjiang River based on boundaries and nodes showed that with human disturbance,the dominance of forest landscape was weakened by other landscape types;thus the landscape pattern of the study area became more homogeneous and the boundary network became more complex.These changes further augmented disturbance interfaces in the landscape and increased the possibilities of further landscape fragmentation.
文摘THE Double Ninth Festival falls on the ninth day of the ninth lunar month.Chinese ancients believed that nine was the largest number.According to the yin/yang dichotomy that forms the basis of the Chinese view of the world,yin represents the elements of darkness and yang represents life and brightness.The number nine is regarded as yang.
基金supported by the National Natural Science Foundation of China (NSFC) (41175006)‘973 Program’(2012CB955602) and the Ministry of Education (MOE)(20090132110008)
文摘This review presents some of the latest achievements in sea fog research,including fog climatology,fog structure in the marine atmospheric boundary layer,and numerical simulations and forecasting of fog.With the development of atmospheric observational techniques and equipments,new facts about sea fog are revealed.The mechanisms involved in the formation,development and dissipation of sea fog are further explored with the help of advanced atmospheric models.
文摘Remote sensing, which came into being at the first International Symposium on Remote Sensing of Environment (ISRSE) 50 years ago, has enabled people to obtain objecive and realistic spatial and temporal information through the application of Earth observation technologies and analyze and understand the macro-level changes of the Earth system from a spaial view. The technology of Earth observaion from space has incomparable advantages in the study of the Earth. This aricle introduces the 50-year development of Earth observaion in the world and the 30-year development of Earth observaion in China and reflects on the building of China's Earth observaion system.
文摘Marx probed into the laws of the evolution of world history and the international system from the perspective of grand history,incisively revealing the inherent historical dynamics and evolutionary secrets of the laws of this development and thus providing a new analytical framework for our understanding of the nature of international relations and the characteristics of the era.Compared with related international relations theories of the same period,Marx’s international outlook had a unique class standpoint and methodological principles and adopted rigorous speculative logic and lofty values.Marx conducted scientific research and dialectical analysis of the laws of evolution and the intrinsic nature of international society,especially the historical mission of the proletariat.These ideas,unique in the intellectual and theoretical spectrum of international relations,provide an intellectual guide for the innovation of Chinese diplomatic theory in the new era.
文摘University students from China and the United States meet in New York to find common ground and share ideas What will the world look like in 2020？According to many international relations observers,in four years’time,China will be world’s leading economy,
