This article gives a brief introduction to the damage brought about by biotic invasion and its causes, and analyzes its impact on national development, ecological safety and the production of agriculture, forestry and...This article gives a brief introduction to the damage brought about by biotic invasion and its causes, and analyzes its impact on national development, ecological safety and the production of agriculture, forestry and animal husbandry. In addition, it expounds the necessity, urgency and cardinal significance in promoting related scientific research in this country. The authors stress that research work should be concentrated on the ecological effects of non-indigenous species in the light of the national demands, world research frontiers and high-tech application. That involves the process of an invasive organism's immigration and propagation, short-term evolution, latent buildup, ecological adaptation, competition and outbreak as well as the process in which the new ecosystem's original structure and functions unfold their role of rejection and assimilation.展开更多
By reviewing the general state of urban flood calamities of the past 40 years and more, this article tries to explore the causes of urban flood, especitlly the man-made factors. It puts forward the ideas of setting up...By reviewing the general state of urban flood calamities of the past 40 years and more, this article tries to explore the causes of urban flood, especitlly the man-made factors. It puts forward the ideas of setting up a comprehensive system for urban flood prevention. This comprehensive system consists of six sub-systems such as: 1) command system; 2) system of flood control and drainage works; 3) system of keeping away of flood and coping with flood; 4) system of flood forecast; 5) flood -fighting and rescue system; 6) flood-preventing legislative and insurance system. This article also puts forward the counter-measures to avert floods and reduce the calamities.I.The General State of Urban Flood Calamities for the Last Few Years in展开更多
Specialized optional courses serve the purpose of perfecting knowledge structure,improving students quality,promoting the development of individual character.This article discusses the embarassment of the specialized ...Specialized optional courses serve the purpose of perfecting knowledge structure,improving students quality,promoting the development of individual character.This article discusses the embarassment of the specialized optional courses from the point of view of understanding the courses,programing of the courses,students' pressure,teachers' background knowledge and examing system first,then offers some counter-measures from the point of view of strengthen attitude,necessary interference,teaching methods,flexible examing system and strict examing system.展开更多
文摘This article gives a brief introduction to the damage brought about by biotic invasion and its causes, and analyzes its impact on national development, ecological safety and the production of agriculture, forestry and animal husbandry. In addition, it expounds the necessity, urgency and cardinal significance in promoting related scientific research in this country. The authors stress that research work should be concentrated on the ecological effects of non-indigenous species in the light of the national demands, world research frontiers and high-tech application. That involves the process of an invasive organism's immigration and propagation, short-term evolution, latent buildup, ecological adaptation, competition and outbreak as well as the process in which the new ecosystem's original structure and functions unfold their role of rejection and assimilation.
文摘By reviewing the general state of urban flood calamities of the past 40 years and more, this article tries to explore the causes of urban flood, especitlly the man-made factors. It puts forward the ideas of setting up a comprehensive system for urban flood prevention. This comprehensive system consists of six sub-systems such as: 1) command system; 2) system of flood control and drainage works; 3) system of keeping away of flood and coping with flood; 4) system of flood forecast; 5) flood -fighting and rescue system; 6) flood-preventing legislative and insurance system. This article also puts forward the counter-measures to avert floods and reduce the calamities.I.The General State of Urban Flood Calamities for the Last Few Years in
文摘Specialized optional courses serve the purpose of perfecting knowledge structure,improving students quality,promoting the development of individual character.This article discusses the embarassment of the specialized optional courses from the point of view of understanding the courses,programing of the courses,students' pressure,teachers' background knowledge and examing system first,then offers some counter-measures from the point of view of strengthen attitude,necessary interference,teaching methods,flexible examing system and strict examing system.
