全文获取类型
收费全文 | 152篇 |
免费 | 2篇 |
专业分类
废物处理 | 5篇 |
环保管理 | 4篇 |
综合类 | 65篇 |
基础理论 | 39篇 |
污染及防治 | 29篇 |
评价与监测 | 3篇 |
社会与环境 | 8篇 |
灾害及防治 | 1篇 |
出版年
2020年 | 2篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2010年 | 4篇 |
2008年 | 4篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1992年 | 3篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1985年 | 4篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1973年 | 2篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 3篇 |
1963年 | 4篇 |
1961年 | 2篇 |
1960年 | 4篇 |
1958年 | 2篇 |
1957年 | 2篇 |
1956年 | 3篇 |
1955年 | 1篇 |
1954年 | 1篇 |
1952年 | 1篇 |
1951年 | 1篇 |
1950年 | 1篇 |
1934年 | 1篇 |
1933年 | 1篇 |
1931年 | 2篇 |
1927年 | 2篇 |
1925年 | 1篇 |
1924年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 250 毫秒
21.
Laser mass spectrometry has been applied for on-line monitoring of traces of aromatic compounds from flue gas of incineration plants. The experiments have been carried out at two sampling sites in an industrial hazardous-waste incinerator. With laser mass spectrometry resonance-enhanced multiphoton ionization (REMPI) with time-of-flight mass spectrometry (TOFMS) (REMPI-TOFMS), using the group selective multi-component monitoring approach, aromatic compounds are selectively ionized from the complex flue-gas matrix. In this case, the result of an REMPI-TOFMS on-line measurement is a distinct pattern of aromatic compounds. These patterns are dependent on: (i) the point of measurement, (ii) the incineration plant, (iii) the temperature, and (iv) the fuel. This contribution focuses on the fuel dependence of the pattern. The most transient behavior can be observed when containers filled with hazardous waste are burnt, leading to puffs. Real-time monitoring results of puffs are given. Furthermore, as an approach towards on-line monitoring of the TEQ (PCDD/F toxicity equivalent), REMPI-TOFMS on-line analysis results of chlorobenzene are presented. 相似文献
22.
23.
24.
25.
26.
C. Eyholzer P. Tingaut T. Zimmermann K. Oksman 《Journal of Polymers and the Environment》2012,20(4):1052-1062
Bionanocomposites of poly(lactic acid) (PLA) and chemically modified, nanofibrillated cellulose (NFC) powders were prepared by extrusion, followed by injection molding. The chemically modified NFC powders were prepared by carboxymethylation and mechanical disintegration of refined, bleached beech pulp (c-NFC), and subsequent esterification with 1-hexanol (c-NFC-hex). A solvent mix was then prepared by precipitating a suspension of c-NFC-hex and acetone-dissolved PLA in ice-cold isopropanol (c-NFC-hexsm), extruded with PLA into pellets at different polymer/fiber ratios, and finally injection molded. Dynamic mechanical analysis and tensile tests were performed to study the reinforcing potential of dried and chemically modified NFC powders for PLA composite applications. The results showed a faint increase in modulus of elasticity of 10?% for composites with a loading of 7.5?% w/w of fibrils, irrespective of the type of chemically modified NFC powder. The increase in stiffness was accompanied by a slight decrease in tensile strength for all samples, as compared with neat PLA. The viscoelastic properties of the composites were essentially identical to neat PLA. The absence of a clear reinforcement of the polymer matrix was attributed to poor interactions with PLA and insufficient dispersion of the chemically modified NFC powders in the composite, as observed from scanning electron microscope images. Further explanation was found in the decrease of the thermal stability and crystallinity of the cellulose upon carboxymethylation. 相似文献
27.
28.
29.
30.