75 research outputs found
Dynamic Evolution of Regional Ecological Services Based on TM Remote Sensing
针对传统评估区域生态系统服务价值空间异质性的问题,本研究将TM遥感影像与价值评估法相结合,测算出针对研究区域的当量因子表,并建立了只需遥感影像数据即可快速并较为精准地动态计算区域生态系统服务价值的多元回归模型。文章以北京市永定河、厦门市和青海省不同尺度为例,对该方法评估区域生态系统服务价值的可行性和准确性进行了讨论,以期为生态综合管理提供定量化参考依据。This paper discussed the dynamic evaluating of regional ecological services with remote sensing technique,based on the comprehensive analysis the character of indexes method and currently equivalent method applying to regional ecological services.With the established method in the literature,it discussed the practical possibility for evaluation the temporal and special regional ecological services in Yongding River,Xiamen and Qinghai province.Compared with the traditional static indexes evaluation,our method discussed the possibility of dynamically evolutional evaluation,in order to provide reference of ecosystem management.北京市科学技术委员会“永定河生态修复目标体系研究”(D090409004009003);北京市生态学重点学科项
CeO2修饰SiO2担载Cu-Ir双金属催化剂的研究
制备了CeO2修饰SiO2担载型铜铱基双金属催化剂,添加CeO2使Cu—Ir/SiO2催化剂在甲醇裂解模型反应中的初始活性和稳定性明显提高,反应10 h后甲醇的转化率保持在96%以上,而Cu-Ir/SiO2催化剂反应10h后活性下降至39.1%.采用XPS,H2-TPR,XRD和TEM等手段对催化剂进行了结构分析,结果表明,铜和铱发生强相互作用,加入助剂CeO2可减少催化剂颗粒团聚
Partial oxidation of methane to syngas over NiO/γ-Al2O3 catalysts prepared by the Sol-Gel method
CO_2原位处理对Sm_(0.5)Sr_(0.5)CoO_(3-δ)电催化剂性能的影响
采用阴极轻度过烧工艺制备了Sm0.5Sr0.5CoO3-δ(SSC)阴极,并在单电池运行条件下利用25%CO2(体积比)对电池阴极进行了原位处理.XRD及TG分析表明,在600℃下,CO2的原位处理导致SSC阴极表面有少量SrCO3和Co3O4生成.空气吹扫下,SrCoO3-δ和Co3O4的存在都有效地改变了阴极材料的表面物理化学性质.阴极电催化剂上氧还原速率的加快显著地降低了阴极的极化电阻,从而导致电池的功率密度提高了约20%
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