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Positive and negative terrains on northern Shaanxi Loess Plateau 被引量:35
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作者 ZHOU Yi tang guo'an +3 位作者 YANG Xin XIAO Chenchao ZHANG Yuan LUO Mingliang 《Journal of Geographical Sciences》 SCIE CSCD 2010年第1期64-76,共13页
The Loess positive and negative terrains (P-N terrains), which are widely distributed on the Loess Plateau, are discussed for the first time by introducing its characteristic, demarcation as well as extraction metho... The Loess positive and negative terrains (P-N terrains), which are widely distributed on the Loess Plateau, are discussed for the first time by introducing its characteristic, demarcation as well as extraction method from high-resolution Digital Elevation Models. Using 5 m-resolution DEMs as original test data, P-N terrains of 48 geomorphological units in different parts of Shaanxi Loess Plateau are extracted accurately. Then six indicators for depicting the geomorphologic landscape and spatial configuration characteristic of P-N terrains are proposed. The spatial distribution rules of these indicators and the relationship between the P-N terrains and Loess relief are discussed for further understanding of Loess landforms. Finally, with the integration of P-N terrains and traditional terrain indices, a series of un-supervised classification methods are applied to make a proper landform classification in northern Shaanxi. Results show that P-N terrains are an effect clue to reveal energy and substance distribution rules on the Loess Plateau. A continuous change of P-N terrains from south to north in Shaanxi Loess Plateau shows an obvious spatial difference of Loess land-forms and the positive terrain area only accounted for 60.5% in this region. The P-N terrains participant landform classification method increases validity of the result, especially in the Loess tableland, Loess tableland-ridge and the Loess low-hill area. This research is significant on the study of Loess landforms with the Digital Terrains Analysis methods. 展开更多
关键词 Loess Plateau positive and negative terrains DEM shoulder-lines spatial differentiation
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Review of Digital Elevation Model (DEM) Based Research on China Loess Plateau 被引量:5
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作者 tang guo'an Ge Shanshan +1 位作者 Li Fayuan Zhou Jieyu 《Journal of Mountain Science》 SCIE CSCD 2005年第3期265-270,共6页
The Loess Plateau is one of the hot research areas for its specific geographical features. In resent years, with the establishment of national multi-scale DEMs and the perfection of DEM based digital terrain analysis ... The Loess Plateau is one of the hot research areas for its specific geographical features. In resent years, with the establishment of national multi-scale DEMs and the perfection of DEM based digital terrain analysis methods, new thoughts and methodologies have been constructed for the Loess Plateau research. This paper introduces the characteristics of DEM data, analyses the development stages of DEM applied in the Loess Plateau research, and discusses its further possible research direction. More discussions are focused on slope spectrum and its concept, as well as the significance in the Loess Plateau research. 展开更多
关键词 REVIEW DEM the Loess Plateau
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尿素热解制氨技术存在的问题分析及对策 被引量:4
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作者 喻小伟 匡萃杰 +1 位作者 唐郭安 朱跃 《清洗世界》 CAS 2018年第10期22-26,共5页
尿素热解制氨工艺因由于其在安全方面的优势,已经在国内越来越多的燃煤电厂SCR脱硝工程中得到应用,但该技术在运行过程中存在运行费用高,燃烧器运行不稳定,绝热分解室堵塞等问题,不利于机组经济与安全运行,通过分析,找出问题原因,提出... 尿素热解制氨工艺因由于其在安全方面的优势,已经在国内越来越多的燃煤电厂SCR脱硝工程中得到应用,但该技术在运行过程中存在运行费用高,燃烧器运行不稳定,绝热分解室堵塞等问题,不利于机组经济与安全运行,通过分析,找出问题原因,提出相应的解决对策。 展开更多
关键词 燃煤电厂 尿素热解 SCR 高温烟气加热器 炉内直喷
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