The JOURNAL OF ANCIENT CIVILIZATIONS(JAC)is published annually in two fascicles by the Institute for the History of Ancient Civilizations(IHAC,Northeast Normal University,Changchun,Jilin Province,People’s Republic of...The JOURNAL OF ANCIENT CIVILIZATIONS(JAC)is published annually in two fascicles by the Institute for the History of Ancient Civilizations(IHAC,Northeast Normal University,Changchun,Jilin Province,People’s Republic of China).The aim of JAC is to provide a forum for the discussion of various aspects of the cultural and historical processes in the Ancient Near Eastern and Mediterranean world,encompassing studies of individual civilizations as well as common elements,contacts,and interactions among them(e.g.,in such traditional fields as Assyriology,Egyptology,Hittitology,Classics,Byzantine Studies,and Sinology,among others).展开更多
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
文摘The JOURNAL OF ANCIENT CIVILIZATIONS(JAC)is published annually in two fascicles by the Institute for the History of Ancient Civilizations(IHAC,Northeast Normal University,Changchun,Jilin Province,People’s Republic of China).The aim of JAC is to provide a forum for the discussion of various aspects of the cultural and historical processes in the Ancient Near Eastern and Mediterranean world,encompassing studies of individual civilizations as well as common elements,contacts,and interactions among them(e.g.,in such traditional fields as Assyriology,Egyptology,Hittitology,Classics,Byzantine Studies,and Sinology,among others).
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＂：
