生态补偿是落实我国生态文明体制改革的重要抓手,是实践“绿水青山就是金山银山”的重要保障。基于Web of Science和CNKI数据库,采用文献计量方法对国内外生态补偿研究领域进行数据挖掘及可视化分析。研究结果表明:(1)生态补偿的研究起...生态补偿是落实我国生态文明体制改革的重要抓手,是实践“绿水青山就是金山银山”的重要保障。基于Web of Science和CNKI数据库,采用文献计量方法对国内外生态补偿研究领域进行数据挖掘及可视化分析。研究结果表明:(1)生态补偿的研究起始于上世纪末,近年来成果产出量有显著增长。(2)发达国家研究影响力较强,国际合作不断加强。(3)该领域的国际研究热点分别是保护管理、生态补偿效应、政策与项目制定、经济学相关方法的应用、生态补偿机制、生物多样性、生态影响及气候变化、土地利用及景观;国内相关研究则更关注生态补偿机制、生态环境保护、可持续发展、对策及政策、生态环境等主题。(4)国内生态补偿研究快速发展,在生态补偿理论、生态补偿机制和政策推广的实证研究、国际合作等方面有待加强和提升。展开更多
The objective of this work was to study the properties of bamboo charcoal and cement-based composite materials and their microstructure. The pastes with various bamboo charcoals were prepared and the relative properti...The objective of this work was to study the properties of bamboo charcoal and cement-based composite materials and their microstructure. The pastes with various bamboo charcoals were prepared and the relative properties such as setting times and strength were tested and the microstructures and pore characteristics of pastes with various bamboos were also studied. The experimental results indicated that bamboo charcoal affects the setting times of cement paste, but the introduction of water reducer relieves this condition. Bamboo charcoal also poses an impact on the hardened paste strength. The prominent strength decrease is found when more and larger size bamboo charcoal is mixed into the cement paste. Bamboo charcoal alters the paste microstructure and increases the porosity and pore volume, but it increases the pores with the diameter of less than 50 μm. The pastes with various bamboo charcoals are given with the good functions such as adjusting humidity and adsorption.展开更多
To evaluate the property and degradation characteristics of concrete prepared with aggregate contained montmorillonite, concretes were prepared with aggregates contained montmorillonite, and then concrete slump loss, ...To evaluate the property and degradation characteristics of concrete prepared with aggregate contained montmorillonite, concretes were prepared with aggregates contained montmorillonite, and then concrete slump loss, compressive strength, electric flux, the resistance to carbonization, freezing-thawing and sulfate attack were evaluated. The results show that montmorillonite appearance alters concrete slump loss and compressive strength. But montmorillonite increases electric flux and compactness. The carbonization, freezingthawing and sulfate attack results indicate that montmorillonite enhances carbonization depth, increases mass loss after 300 cycle freezing-thawing, as well as mass loss after sulfate attack. Overall, it is adverse to the concrete resistance to the carbonization, freezing-thawing and sulfate attack.展开更多
文摘生态补偿是落实我国生态文明体制改革的重要抓手,是实践“绿水青山就是金山银山”的重要保障。基于Web of Science和CNKI数据库,采用文献计量方法对国内外生态补偿研究领域进行数据挖掘及可视化分析。研究结果表明:(1)生态补偿的研究起始于上世纪末,近年来成果产出量有显著增长。(2)发达国家研究影响力较强,国际合作不断加强。(3)该领域的国际研究热点分别是保护管理、生态补偿效应、政策与项目制定、经济学相关方法的应用、生态补偿机制、生物多样性、生态影响及气候变化、土地利用及景观;国内相关研究则更关注生态补偿机制、生态环境保护、可持续发展、对策及政策、生态环境等主题。(4)国内生态补偿研究快速发展,在生态补偿理论、生态补偿机制和政策推广的实证研究、国际合作等方面有待加强和提升。
基金Funded by the National Natural Science Foundation of China(Nos.51678442,51578412,51478348,and 51508404)the National High-speed Train Union Fund(U1534207)+1 种基金the Key Project of the Shanghai Committee of Science and Technology(No.15DZ1205003)the Fundamental Research Funds for the Central Universities
文摘The objective of this work was to study the properties of bamboo charcoal and cement-based composite materials and their microstructure. The pastes with various bamboo charcoals were prepared and the relative properties such as setting times and strength were tested and the microstructures and pore characteristics of pastes with various bamboos were also studied. The experimental results indicated that bamboo charcoal affects the setting times of cement paste, but the introduction of water reducer relieves this condition. Bamboo charcoal also poses an impact on the hardened paste strength. The prominent strength decrease is found when more and larger size bamboo charcoal is mixed into the cement paste. Bamboo charcoal alters the paste microstructure and increases the porosity and pore volume, but it increases the pores with the diameter of less than 50 μm. The pastes with various bamboo charcoals are given with the good functions such as adjusting humidity and adsorption.
基金Funded by the National Natural Science Foundation of China(Nos.51578412 and 51878479)the Fundamental Research Funds for the Central Universities
文摘To evaluate the property and degradation characteristics of concrete prepared with aggregate contained montmorillonite, concretes were prepared with aggregates contained montmorillonite, and then concrete slump loss, compressive strength, electric flux, the resistance to carbonization, freezing-thawing and sulfate attack were evaluated. The results show that montmorillonite appearance alters concrete slump loss and compressive strength. But montmorillonite increases electric flux and compactness. The carbonization, freezingthawing and sulfate attack results indicate that montmorillonite enhances carbonization depth, increases mass loss after 300 cycle freezing-thawing, as well as mass loss after sulfate attack. Overall, it is adverse to the concrete resistance to the carbonization, freezing-thawing and sulfate attack.
