检索结果-南通市图书馆

开拓航空航天动力装置的新领域——评介《超音速燃烧与超音速燃烧冲压发动机》

引用

中国图书评论 1995年第8期18卷 36-37页

作者：张近乐

超音速燃烧冲压发动机是一种新型的吸气式发动机，装置了这种发动机的飞行器将大大突破现有的速度和高度极限，使飞行马赫数（运动速度与音速之比)达到6～25．从而实现人类航空航天史上一个新的突破。

关键词：突破高度极限冲压发动机评介运动速度开拓吸气航空航天飞行

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Altitudinal Levels and Altitudinal Limits in High Mountains

引用

Journal of Mountain Science 2007年第1期4卷 24-33页

作者： Matthias Kuhle Geographie/Hochgebirgsgeomorphologie Geographisches Institut der Universitt Goldschmidtstr.5 37077 Gttingen Germany

In lowlands climate-specific processes due to weathering and erosion are dominant, whilst the geomorphology of mountains is dependent on the geologic-tectonic structure, i.e., the energy of erosion that increases according to the vertical. The expression "extremely high mountains" has been established as the extreme of a continuous mountain classification. It has to be understood in terms of geomorphology, glaciology and vegetation. Correspondence of the planetary and hypsometric change of forms is of great value as synthetic explanation. It is confirmed with regard to vegetation, periglacial geomorphology and glaciology. Due to the world-wide reconstruction of the snowline its paleoclimatic importance increases, too. Apart from lower limits the periglacial and glacial altitudinal levels also show zones of optimum development and climatic upper limits in the highest mountains of the earth. According to the proportion of the altitudinal levels a classification as to arid, temperate and humid high mountains has been carried out.

关键词：高山地貌海拔高度高度极限侵蚀能冰川

来源：

维普期刊数据库

同方期刊数据库评论