A technique applying voltage across the tunnel junction for wnting permanent features on graphite with lines about 10nm wiidth using our home-built scanning tunneling microscope has been presented.Multiple-tip effects...A technique applying voltage across the tunnel junction for wnting permanent features on graphite with lines about 10nm wiidth using our home-built scanning tunneling microscope has been presented.Multiple-tip effects while modifying the surface are often met.The phenomciifi are explained in terms of the strong electric field existing at the junction between the tip an<7 the surface.In addition,the shape of the structure indented by the tip is in agreement with that of the tip.展开更多
Two unit cells to 200Åthick ultrathin YBa_(2)Cu_(3)O_(7)-δfilms have been synthesized and their growth mechanism and physical properties have been studied.Atomic force microscopy showed that the films grow with ...Two unit cells to 200Åthick ultrathin YBa_(2)Cu_(3)O_(7)-δfilms have been synthesized and their growth mechanism and physical properties have been studied.Atomic force microscopy showed that the films grow with both spiral and layer by layer modes and the screw dislocations appeared even in the 6 unit cells thick films.In the initial growth stages of the films,the strong dependence of T_(c)on the film thickness is discussed.展开更多
The world has witnessed rapid and significiant progress in economy and society in the past 30 years.Yet,one must acknowledge that these progress has been rather uneven and insufficient.We are still at a time to meet i...The world has witnessed rapid and significiant progress in economy and society in the past 30 years.Yet,one must acknowledge that these progress has been rather uneven and insufficient.We are still at a time to meet immense challenges for shared and sustainable development.展开更多
THE 19th Central Committee of the Communist Part of China(CPC)made proposals for the formulation of the 14th Five-Year Plan(2021-2025)for National Economic and Social Development and the Long-Range Objectives Through ...THE 19th Central Committee of the Communist Part of China(CPC)made proposals for the formulation of the 14th Five-Year Plan(2021-2025)for National Economic and Social Development and the Long-Range Objectives Through the Year 2035 at its fifth plenary session.The proposals took into consideration the current changing trends at home and abroad,and China’s urgent need for highquality science and technology achievements in economic and social development in the new era.展开更多
Dramatic changes have taken place in global environment and sustainable development patterns since 1992, when the United Nations Conference on Environment and Development
This year sees the 100th anniversary of the founding of the International Association of Chemical Societies （IACS）, the predecessor to today＇s International Union of Pure and Applied Chemistry （IUPAC）. It also co...This year sees the 100th anniversary of the founding of the International Association of Chemical Societies （IACS）, the predecessor to today＇s International Union of Pure and Applied Chemistry （IUPAC）. It also coincides with the 100th anniversary of a Nobel Prize being awarded to Marie Curie. To celebrate the achievements of chemical science and its contributions to human wellbeing, on December 30, 2008, the 63rd General Assembly of the United Nations adopted a resolution proclaiming 2011 the International Year of Chemistry, with the theme, Chemistry： Our Life, Our Future.展开更多
Four decades ago, the Chinese Academy of Sciences and the Max Planck Society established their scientific cooperation. Since then, these collaborative ties have been continuously strengthened. The Presidents of both r...Four decades ago, the Chinese Academy of Sciences and the Max Planck Society established their scientific cooperation. Since then, these collaborative ties have been continuously strengthened. The Presidents of both research organisations, Professor Bai Chunli and Professor Peter Gruss, look back on the development of earlier decades, highlight past success and future challenges – and underline the importance of cooperation in the new times of globalisation of science.展开更多
Drastic changes are taking place worldwide in productivity,growth modes,lifestyles and socioeconomic development patterns.With the strong demands of modernization and globalization,a new round of S&T revolution is...Drastic changes are taking place worldwide in productivity,growth modes,lifestyles and socioeconomic development patterns.With the strong demands of modernization and globalization,a new round of S&T revolution is gaining momentum and is expected to give birth to signifi cant breakthroughs.S&T innovation,the most active and revolutionary factor in today’s world,clearly characterizes our times and makes it different from any other times in the past.It has become a strategic option for various countries to cultivate new economic growth points and compete to take favorite positions for S&T advancement.In the wake of the international fi展开更多
This article draws inspiration from the development of chemical science over the past 100 years,as well as its contributions to the advancement of other scientific disciplines and human civilization. It also highlight...This article draws inspiration from the development of chemical science over the past 100 years,as well as its contributions to the advancement of other scientific disciplines and human civilization. It also highlights the rapid growth of chemistry in China and makes suggestions on its future development in the new era facing the challenges of energy,resources,materials and the environment.展开更多
文摘A technique applying voltage across the tunnel junction for wnting permanent features on graphite with lines about 10nm wiidth using our home-built scanning tunneling microscope has been presented.Multiple-tip effects while modifying the surface are often met.The phenomciifi are explained in terms of the strong electric field existing at the junction between the tip an<7 the surface.In addition,the shape of the structure indented by the tip is in agreement with that of the tip.
基金Supported by the Chinese National Center for Research and Development on Superconductivity.
文摘Two unit cells to 200Åthick ultrathin YBa_(2)Cu_(3)O_(7)-δfilms have been synthesized and their growth mechanism and physical properties have been studied.Atomic force microscopy showed that the films grow with both spiral and layer by layer modes and the screw dislocations appeared even in the 6 unit cells thick films.In the initial growth stages of the films,the strong dependence of T_(c)on the film thickness is discussed.
文摘The world has witnessed rapid and significiant progress in economy and society in the past 30 years.Yet,one must acknowledge that these progress has been rather uneven and insufficient.We are still at a time to meet immense challenges for shared and sustainable development.
文摘THE 19th Central Committee of the Communist Part of China(CPC)made proposals for the formulation of the 14th Five-Year Plan(2021-2025)for National Economic and Social Development and the Long-Range Objectives Through the Year 2035 at its fifth plenary session.The proposals took into consideration the current changing trends at home and abroad,and China’s urgent need for highquality science and technology achievements in economic and social development in the new era.
文摘Dramatic changes have taken place in global environment and sustainable development patterns since 1992, when the United Nations Conference on Environment and Development
文摘This year sees the 100th anniversary of the founding of the International Association of Chemical Societies （IACS）, the predecessor to today＇s International Union of Pure and Applied Chemistry （IUPAC）. It also coincides with the 100th anniversary of a Nobel Prize being awarded to Marie Curie. To celebrate the achievements of chemical science and its contributions to human wellbeing, on December 30, 2008, the 63rd General Assembly of the United Nations adopted a resolution proclaiming 2011 the International Year of Chemistry, with the theme, Chemistry： Our Life, Our Future.
文摘Four decades ago, the Chinese Academy of Sciences and the Max Planck Society established their scientific cooperation. Since then, these collaborative ties have been continuously strengthened. The Presidents of both research organisations, Professor Bai Chunli and Professor Peter Gruss, look back on the development of earlier decades, highlight past success and future challenges – and underline the importance of cooperation in the new times of globalisation of science.
文摘Drastic changes are taking place worldwide in productivity,growth modes,lifestyles and socioeconomic development patterns.With the strong demands of modernization and globalization,a new round of S&T revolution is gaining momentum and is expected to give birth to signifi cant breakthroughs.S&T innovation,the most active and revolutionary factor in today’s world,clearly characterizes our times and makes it different from any other times in the past.It has become a strategic option for various countries to cultivate new economic growth points and compete to take favorite positions for S&T advancement.In the wake of the international fi
文摘This article draws inspiration from the development of chemical science over the past 100 years,as well as its contributions to the advancement of other scientific disciplines and human civilization. It also highlights the rapid growth of chemistry in China and makes suggestions on its future development in the new era facing the challenges of energy,resources,materials and the environment.
