全文获取类型
收费全文 | 71篇 |
免费 | 3篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 12篇 |
环保管理 | 5篇 |
综合类 | 44篇 |
基础理论 | 7篇 |
污染及防治 | 15篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 1篇 |
2013年 | 6篇 |
2012年 | 8篇 |
2011年 | 5篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有92条查询结果,搜索用时 203 毫秒
51.
52.
活性炭纤维脱除二氧化碳的实验研究 总被引:2,自引:1,他引:1
采用活性炭纤维(ACF)作为吸附材料,研究了ACF对CO_2和N_2的吸、脱分离特性。结果表明,粘胶基活性炭纤维(V-ACF)和聚丙烯腈基活性炭纤维(PAN-ACF)对CO_2和N_2都表现出较好的吸附效果,其中V-ACF对CO_2和N_2的吸附系数高达9,说明ACF是很好的吸附分离材料。ACF对不同烟气浓度和温度下对CO_2吸附的结果说明,ACF对于高浓度CO_2更易于脱除;讨论了ACF在不同解析温度或时间对吸附的影响和ACF的热稳定性,结果表明,在较高解析温度或者较长解析时间下更加容易脱除CO_2,且再生时间短,最佳的解析时间为15 min。经过相同的多次实验,ACF的性能稳定,再生效率稳定在86%。 相似文献
53.
Preparation and application of efficient TiO2/ACFs photocatalyst 总被引:3,自引:0,他引:3
Activated carbon fibers (ACFs) supported titanium dioxide (TiO2) photocatalyst was developed by sol-gel method. The surface morphology and microstructure of the photocatalyst were characterized with scan electron microscope(SEM), X-ray diffraction patterns and specific surface area analysis. The prepared photocatalyst is specially helpful for the removal of low molecular weight organic pollutants in wastewater. Decomposition efficiency of methylene blue solution by TiO2/ACFs catalyst reached almost 100% under 60 min reaction, while the decomposition efficiency by pure TiO2 was only 25% under 3 h reaction. The mineralization of toluene aqueous solution was measured by total organic carbon instrument, and the evolution of intermediate species was detected by gas chromatograph instrument. The results indicated that the prepared photocatalyst not only enhanced the photoactivity of TiO2, but also suppressed the emergence of intermediate species, which may be more deleterious to human. The enhancement of photocatalysis was due to increased efficiency of adsorption and desorption, which were control steps in heterogeneous photocatalysis. 相似文献
54.
55.
玄武岩纤维片材和碳纤维片材高温后拉伸性能比较 总被引:1,自引:0,他引:1
对未经环氧树脂浸渍以及经环氧树脂充分浸渍的单向玄武岩纤维增强复合材料(BFRP)片材和碳纤维增强复合材料(CFRP)片材进行了高温后拉伸性能试验。试验结果表明,常温下和高温后BFRP片材的拉伸强度和拉伸模量均远远小于CFRP片材,但伸长率一般高于CFRP片材;常温下,环氧树脂的存在能够显著提高FRP片材的拉伸强度,但高温处理后,环氧树脂的作用不明显,尤其对于CFRP片材;浸渍环氧树脂的CFRP片材和BFRP片材的拉伸强度随温度的变化规律基本一致,均呈现出先降后升再降的趋势,并在150℃左右时取得最大;浸渍和未浸渍环氧树脂的FRP片材在经历300~400℃高温处理后强度均出现急剧下降;当处理温度大于200℃时,处理时间越长,FRP片材的拉伸强度和拉伸模量下降越多。 相似文献
56.
C. N. Ludvik G. M. Glenn A. P. Klamczynski D. F. Wood 《Journal of Polymers and the Environment》2007,15(4):251-257
Adding cellulose fiber reinforcement can improve mechanical properties of biodegradable plastics, but fiber must be well dispersed
to achieve any benefit. The approach to dispersing fiber in this study was to use aqueous gels of sodium bentonite clay. These
clay-fiber gels were combined with powdered compostable thermoplastics and calcium carbonate filler. The composite was dried,
twin-screw extruded, and injection molded to make thin parts for tensile testing. An experimental design was used to determine
the effect of fiber concentration, fiber length, and clay concentration. Polybutylene adipate/terephthalate copolymer (PBAT)
and 70/30 polylactic acid (PLA)/PBAT blend were the biodegradable plastics studied. The composite strength decreased compared
to the thermoplastics (13 vs. 19 MPa for PBAT, 27 vs. 38 MPa for the PLA/PBAT blend). The composite elongation to break decreased
compared to the thermoplastics (170% vs. 831% for PBAT, 4.9% vs. 8.7% for the PLA/PBAT blend). The modulus increased for the
composites compared to the thermoplastic standards (149 vs. 61 MPa for PBAT, 1328 vs. 965 MPa for the PLA/PBAT blend). All
composite samples had good water resistance. 相似文献
57.
58.
Peng Ye Lauren Reitz Chris Horan Richard Parnas 《Journal of Polymers and the Environment》2006,14(1):1-7
Wheat gluten is a naturally occurring protein polymer. It is biodegradable and very inexpensive (less than $1.00/kg). Nonfood
applications of wheat gluten have been explored to develop biodegradable polymers from renewable resources. In this work,
gluten was reinforced with unidirectional basalt fibers in a compression molding operation. Biodegradation behavior of wheat
gluten/basalt composites was examined by putting specimens into soil of prescribed moisture content. Specimens were removed
at various time intervals and tested for mass loss and change in mechanical properties. Both mass and mechanical properties
show a steady decline over a soil exposure time of 40 days. However, the basalt composite retained mechanical properties longer.
At the same time, the bacterial count on the specimen surfaces increased exponentially. Field emission scanning electron microscope
images show smooth fracture surfaces, indicating brittle failure of the wheat gluten. However, there are many small holes
in the protein matrix with diameter of order 100 nm. These small inclusions may contribute to the brittleness through stress
concentration. 相似文献
59.
《International Journal of Sustainable Engineering》2013,6(4):233-239
ABSTRACTThe high-performance carbon fibres can be recycled from waste carbon fibre/epoxy resin composites by supercritical n-butanol. Recycling experiment designed by response surface method was used to investigate quantitative relation between degradation rate of epoxy resin and process parameters. Thus, the optimum process parameters could be obtained, and effects of process parameters and layers on degradation rate and mechanical performance of the recycled carbon fibres were analysed. The tensile strength of the recycled carbon fibre under the optimum process parameters was 94.53% of that of the original carbon fibre, tensile modulus was 93.57% of that of the original carbon fibre and interfacial shear strength was 90% of that of the original carbon fibre. 相似文献
60.