Based on the WoS and CNKI databases,this paper provides statistical analysis of Chinese and international polar research from 2013-2018 in terms of the number of publications,citations,institutions,disciplinary distri...Based on the WoS and CNKI databases,this paper provides statistical analysis of Chinese and international polar research from 2013-2018 in terms of the number of publications,citations,institutions,disciplinary distribution,collaborations,source journals,and highly cited papers by bibliometric methods.Combining the differences of the traditional disciplinary advantages and natural geographical locations of China and the West,the current research hotspots in the polar field are summarized.(1)"Polar ice cap instability and sea level change","sensitivity and vulnerability of polar ecosystems","Arctic sea-ice-air interactions and climate effects"are the focus of research in the world.(2)Political environment research such as"National Strategy and Cooperation under the'Silk Road on Ice'Initiative"has become a unique polar strategic topic in China.At the same time,insights and suggestions are put forward from three aspects,such as increasing policy support,building cooperation system and optimizing strategic layout.展开更多
PEM （Proton Exchange Membrane） fuel cell is a promising renewable energy source to a wide range of applications for its clean products and high power density. However, controlling its humidity is a challenging probl...PEM （Proton Exchange Membrane） fuel cell is a promising renewable energy source to a wide range of applications for its clean products and high power density. However, controlling its humidity is a challenging problem due to the interdependence of several phenomena contributing in membrane＇s water content. This work deals with efficiency improvement of PEM fuel cells via humidity control. An innovative strategy of control based on the model of Ref. [1] is proposed. It consists on regulating gas humidification rates according to the power demand so that to minimize power losses. The proposed control takes into consideration constraints related to humidification in order to avoid dry out or flooding of the membrane. Simulations results show that time-phasing between hydrogen and oxygen humidification rates plays an important role in minimizing power losses. The proposed control shows significant improvement in the fuel cell＇s efficiency up to 20%.展开更多
This article expounds the action mechanism on correlation between stomach meridians points and stomach as well as its perspective from myriad ancient and modem literature.
Focusing on international relations from the perspective of geography, geopolitics exerts powerful influences on the course of economic and political development in the world. In the tide of globalization and informat...Focusing on international relations from the perspective of geography, geopolitics exerts powerful influences on the course of economic and political development in the world. In the tide of globalization and information technology, geopolitics has become an important subject for global pattern interpretation and policy making. It is essentially important to have a scientific and systematic review on international geopolitics to promote its development. Based on the bibliometric statistics, the paper reviews the research development of geopolitics on the Web of Science from 1996 to 2015. The history, journals, papers and key research areas of geopolitics have been revealed in the paper. By the analysis of bibliometric statistics, the number of papers recently published in the journals of political geography and related geography journals continues to increase. The key areas of geopolitical papers which are globally highly cited include geopolitical interpretation of the countries and borders, critical geopolitics, emotional geopolitics, feminist geopolitics and other topics. Before the year of 2000, the state and borders were hot topics of the geopolitical research. Yet since 2000, it has been the trend that the geopolitics is increasingly set in the context of geographical implications. At the same time, critical geopolitics appears to be the main area of geopolitical research, especially transitioning from traditional geopolitics towards the humanism-embeddedness(such as emotional geopolitics, feminist geopolitics). The paper then systematically reviews the branch trends of geopolitical research, including the borders and the territory, global geo-culture and geo-economics, Chinese models of geopolitics, resource conflicts and ecological politics, as well as emotional geopolitics. Finally, it puts forward the implication that Chinese geopolitical studies should reinforce the importance of geographical space and scale, use the process of description and multiple methods, as well as integrate humanistic thoughts, in order to further enrich the theories and practices of geopolitical research.展开更多
文摘Based on the WoS and CNKI databases,this paper provides statistical analysis of Chinese and international polar research from 2013-2018 in terms of the number of publications,citations,institutions,disciplinary distribution,collaborations,source journals,and highly cited papers by bibliometric methods.Combining the differences of the traditional disciplinary advantages and natural geographical locations of China and the West,the current research hotspots in the polar field are summarized.(1)"Polar ice cap instability and sea level change","sensitivity and vulnerability of polar ecosystems","Arctic sea-ice-air interactions and climate effects"are the focus of research in the world.(2)Political environment research such as"National Strategy and Cooperation under the'Silk Road on Ice'Initiative"has become a unique polar strategic topic in China.At the same time,insights and suggestions are put forward from three aspects,such as increasing policy support,building cooperation system and optimizing strategic layout.
文摘PEM （Proton Exchange Membrane） fuel cell is a promising renewable energy source to a wide range of applications for its clean products and high power density. However, controlling its humidity is a challenging problem due to the interdependence of several phenomena contributing in membrane＇s water content. This work deals with efficiency improvement of PEM fuel cells via humidity control. An innovative strategy of control based on the model of Ref. [1] is proposed. It consists on regulating gas humidification rates according to the power demand so that to minimize power losses. The proposed control takes into consideration constraints related to humidification in order to avoid dry out or flooding of the membrane. Simulations results show that time-phasing between hydrogen and oxygen humidification rates plays an important role in minimizing power losses. The proposed control shows significant improvement in the fuel cell＇s efficiency up to 20%.
文摘This article expounds the action mechanism on correlation between stomach meridians points and stomach as well as its perspective from myriad ancient and modem literature.
基金National Natural Science Foundation of China,No.41530634,No.41530751
文摘Focusing on international relations from the perspective of geography, geopolitics exerts powerful influences on the course of economic and political development in the world. In the tide of globalization and information technology, geopolitics has become an important subject for global pattern interpretation and policy making. It is essentially important to have a scientific and systematic review on international geopolitics to promote its development. Based on the bibliometric statistics, the paper reviews the research development of geopolitics on the Web of Science from 1996 to 2015. The history, journals, papers and key research areas of geopolitics have been revealed in the paper. By the analysis of bibliometric statistics, the number of papers recently published in the journals of political geography and related geography journals continues to increase. The key areas of geopolitical papers which are globally highly cited include geopolitical interpretation of the countries and borders, critical geopolitics, emotional geopolitics, feminist geopolitics and other topics. Before the year of 2000, the state and borders were hot topics of the geopolitical research. Yet since 2000, it has been the trend that the geopolitics is increasingly set in the context of geographical implications. At the same time, critical geopolitics appears to be the main area of geopolitical research, especially transitioning from traditional geopolitics towards the humanism-embeddedness(such as emotional geopolitics, feminist geopolitics). The paper then systematically reviews the branch trends of geopolitical research, including the borders and the territory, global geo-culture and geo-economics, Chinese models of geopolitics, resource conflicts and ecological politics, as well as emotional geopolitics. Finally, it puts forward the implication that Chinese geopolitical studies should reinforce the importance of geographical space and scale, use the process of description and multiple methods, as well as integrate humanistic thoughts, in order to further enrich the theories and practices of geopolitical research.
