This paper provides a detailed introduction to and analysis of the course of China's technological innovation in liquid hydrogen/liquid oxygen(LH2/LOX)rocket engines from a historical point of view.It starts with ...This paper provides a detailed introduction to and analysis of the course of China's technological innovation in liquid hydrogen/liquid oxygen(LH2/LOX)rocket engines from a historical point of view.It starts with the investigation of LH2/LOX rocket engines by relevant departments of the Chinese Academy of Sciences in the 1960s and their preliminary achievements.Then,the policy decision concerning LH2/LOX engine development,the project approval of the Long March-3(Chang Zheng-3,CZ-3)rocket,and the process of developing LH2/LOX engines are analyzed in detail,followed by an introduction to and summary of the development situation and technical innovation characteristics of China's LH2/LOX engines as they grew from 4 tons to 8 tons,and finally to 50 tons.Finally,the paper briefly analyzes the innovation experience connected with China's LH2/LOX engines.展开更多
Songnen Sandy Land lies in the eastern fringe of huge sandy belt of middle latitude inEurasia Continent Here is also the eastern fringe of desertification-prone land in China. Its specialconditions such as biology and...Songnen Sandy Land lies in the eastern fringe of huge sandy belt of middle latitude inEurasia Continent Here is also the eastern fringe of desertification-prone land in China. Its specialconditions such as biology and climate, the history of evolution of sandy land and its location make itpossess features differing from other sandy lands in the country. This article systematitaly discussesthe regional featured such as the historical process, modern process, environmental factors ondesertification and the sandy land landscape and the degree of desertification, and raises some advicesfor rehabilitation and development in this area.展开更多
The ruins of Chingwa Taktse are located in the Chogye Valley in Lhoka of Tibet.It faces the famous Valley of the Kings across a distance.According to Tibetan historical records,Chingwa Taktse was the earliest Tubo pal...The ruins of Chingwa Taktse are located in the Chogye Valley in Lhoka of Tibet.It faces the famous Valley of the Kings across a distance.According to Tibetan historical records,Chingwa Taktse was the earliest Tubo palace complex.Six notable palaces were built successively on the rolling hills here.Local folklore has it that it is a＂princess＇s tomb＂：展开更多
China’s opening up since 1978 has been a historical process of continuous expansion and deepening.In the course of this process,Chinese policymakers and the mass of the people have gradually deepened their understand...China’s opening up since 1978 has been a historical process of continuous expansion and deepening.In the course of this process,Chinese policymakers and the mass of the people have gradually deepened their understanding of reform and opening up,and China’s relations with the world,especially its role in the world,have been constantly adjusted.At the beginning of reform and opening up,China adapted to and was integrated into the international economic system;it then became engaged in participating in and improving that system,and then became an advocate and leader in the reform of the international system.Moreover,in practice,an incremental series of coherent open economic policies and theories with Chinese characteristics that facilitate an open economy have come into being.Under the guidance of Deng Xiaoping Theory of reform and opening up,China’s practice of opening up to the outside world is not only a good fit with China’s traditional trade theory,the Huainanzi/Sima Qian Theorem,under which people benefit by exchanging their surplus goods for those that they lack,but is also explicable in terms of modern economic trade theories.With the entry of socialism with Chinese characteristics into the new era and profound changes in the international environment,China still needs to open further to lead and promote mutual and shared openness for all countries in the world,so as to create good international conditions for promoting the construction of a shared future for mankind and building a world of lasting peace,universal security,common prosperity,openness,inclusiveness,cleanliness and beauty.展开更多
基金Projects funded by the National Social Science Fund (19BDJ064)
文摘This paper provides a detailed introduction to and analysis of the course of China's technological innovation in liquid hydrogen/liquid oxygen(LH2/LOX)rocket engines from a historical point of view.It starts with the investigation of LH2/LOX rocket engines by relevant departments of the Chinese Academy of Sciences in the 1960s and their preliminary achievements.Then,the policy decision concerning LH2/LOX engine development,the project approval of the Long March-3(Chang Zheng-3,CZ-3)rocket,and the process of developing LH2/LOX engines are analyzed in detail,followed by an introduction to and summary of the development situation and technical innovation characteristics of China's LH2/LOX engines as they grew from 4 tons to 8 tons,and finally to 50 tons.Finally,the paper briefly analyzes the innovation experience connected with China's LH2/LOX engines.
文摘Songnen Sandy Land lies in the eastern fringe of huge sandy belt of middle latitude inEurasia Continent Here is also the eastern fringe of desertification-prone land in China. Its specialconditions such as biology and climate, the history of evolution of sandy land and its location make itpossess features differing from other sandy lands in the country. This article systematitaly discussesthe regional featured such as the historical process, modern process, environmental factors ondesertification and the sandy land landscape and the degree of desertification, and raises some advicesfor rehabilitation and development in this area.
文摘The ruins of Chingwa Taktse are located in the Chogye Valley in Lhoka of Tibet.It faces the famous Valley of the Kings across a distance.According to Tibetan historical records,Chingwa Taktse was the earliest Tubo palace complex.Six notable palaces were built successively on the rolling hills here.Local folklore has it that it is a＂princess＇s tomb＂：
文摘China’s opening up since 1978 has been a historical process of continuous expansion and deepening.In the course of this process,Chinese policymakers and the mass of the people have gradually deepened their understanding of reform and opening up,and China’s relations with the world,especially its role in the world,have been constantly adjusted.At the beginning of reform and opening up,China adapted to and was integrated into the international economic system;it then became engaged in participating in and improving that system,and then became an advocate and leader in the reform of the international system.Moreover,in practice,an incremental series of coherent open economic policies and theories with Chinese characteristics that facilitate an open economy have come into being.Under the guidance of Deng Xiaoping Theory of reform and opening up,China’s practice of opening up to the outside world is not only a good fit with China’s traditional trade theory,the Huainanzi/Sima Qian Theorem,under which people benefit by exchanging their surplus goods for those that they lack,but is also explicable in terms of modern economic trade theories.With the entry of socialism with Chinese characteristics into the new era and profound changes in the international environment,China still needs to open further to lead and promote mutual and shared openness for all countries in the world,so as to create good international conditions for promoting the construction of a shared future for mankind and building a world of lasting peace,universal security,common prosperity,openness,inclusiveness,cleanliness and beauty.
