全文获取类型
收费全文 | 85篇 |
免费 | 0篇 |
国内免费 | 9篇 |
专业分类
安全科学 | 17篇 |
废物处理 | 24篇 |
环保管理 | 10篇 |
综合类 | 22篇 |
基础理论 | 8篇 |
污染及防治 | 12篇 |
评价与监测 | 1篇 |
出版年
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 6篇 |
2014年 | 15篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 8篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有94条查询结果,搜索用时 15 毫秒
41.
42.
43.
Xiaoxiao Yin Junyu Tao Guanyi Chen Xilei Yao Pengpeng Luan Zhanjun Cheng Ning Li Zhongyue Zhou Beibei Yan 《Frontiers of Environmental Science & Engineering》2023,17(1):6
44.
45.
46.
47.
Deposition of combustible dust on a hot surface is a hidden danger of fire. In this work, polymethylmethacrylate (PMMA) dust was selected to analyse the influence of dust layer diameter, dust particle size and dust layer thickness on the ignition characteristics of PMMA dust layer. Critical heating temperatures and ignition time had been measured. The STA-GC/MS-FTIR analysis was used to determine that the main products of PMMA pyrolysis were MMA, CO, CO2, and C2H4, of which CO and C2H4 were transported to the ambient to cause gas phase combustion on the surface of the dust layer. For 10 mm thick dust layer, the critical heating temperatures of 5 μm PMMA, 100 nm PMMA, and 30 μm PMMA were 300 °C, 330 °C, and 320 °C. As the thickness of the dust layer increased, the gas transport path became longer, the critical heating temperature and ignition time increased. The characteristic particle size (D [3,2]) was utilized to represent the true particle size, and the ignition time increased with the increase of the characteristic particle size. The increase in the diameter of the dust layer had a slight effect on the temperature history and ignition time of the dust layer. 相似文献
48.
Ionic liquid, an organic molten salt, has efficient flame-retardant performance. Few researchers have attempted to study its flame-retardant mechanism. Moreover, thermal stability and pyrolysis products have a great impact on the flame retardancy. Therefore, this paper focused on the phosphate ionic liquid of 1-butyl-3-methylimidazolium dibutyl phosphate ([Bmim][DBP]) and analyzed its thermal decomposition products and characteristics. The major bond energies of [Bmim][DBP] were calculated using B3LYP/6–311++G(d,p)//M06–2X/6–311++G(d,p) level. The experimental results show that the pyrolysis products were as followed: alkane or alkene with a carbon chain length of 1–4; imidazole and its derivatives; esters. Furthermore, Gas chromatography-mass spectrometer and Fourier transform infrared spectrometer were utilized to measure the gaseous products and solid phase products of [Bmim][DBP], which were obtained during thermogravimetric analysis. The results of theoretical and experimental analysis were highly consistent. Finally, the possible flame-retardant mechanism of [Bmim][DBP] was proposed. 相似文献
49.
Pyrolysis is considered as possible technique to thermally convert waste plastics into chemicals and energy. Literature on experimental findings is extensive, although experiments are mostly performed in a dynamic heating mode, using thermogravimetric analysis (TGA) and at low values of the heating rate (mostly below 30 K/min). The present research differs from literature through the application of far higher heating rates, up to 120 K/min. The use of these dynamic results to define the reaction kinetics necessitates the selection of an appropriate reaction mechanism, and 21 models have been proposed in literature considering the rate limiting step being diffusion, nucleation or the reaction itself.The current research studied the cracking of PET and PS by TGA at different heating rates (temperature ramps). Results were used to check the validity of the proposed mechanisms. Several conclusions are drawn: (i) to obtain fair results, the heating ramp should exceed a minimum value, calculated at 30 K/min for PET and 80 K/min for PS; (ii) application of the majority of the models to experimental findings demonstrated that they do not meet fundamental kinetic considerations and are questionable in their use; and (iii) simple models, with reaction order 1 or 2, provide similar results of the reaction activation energy.A further comparison with literature data for dynamic and isothermal experiments confirms the validity of these selected models. Since TGA results are obtained on a limited amount of sample, with results being a strong function of the applied heating rate, the authors believe that isothermal experiments, preferably on a large scale both towards equipment and/or sample size, are to be preferred. 相似文献
50.
Krzysztof German Kamil Kulesza Miriam Florack 《Journal of Material Cycles and Waste Management》2006,8(2):116-121
Recycling of poly(vinyl chloride) (PVC) waste is a serious problem because of its high chlorine content. Dehydrochlorination
of PVC-containing polymer waste produces solid residue char, for which conversion to pyrolysis oil in a petrochemical plant
seems to be an attractive way of recycling PVC waste. Unfortunately, some polymer admixtures react with HCl and cause formation
of chloroorganic compounds in a char. This article describes the influence of polycarbonates and poly(ethylene terephthalate)
on thermal feedstock recycling of PVC wastes using a two-stage method. It was found that the presence of polycarbonate causes
the formation of small amounts of benzyl chloride and other chloroaryl or chloroalkylaryl compounds. Poly(ethylene terephthalate)
interacts with HCl forming significant amounts of various chlorocompounds – mainly chloroethyl esters of terephthalic and
benzoic acids, but derivatives possessing chlorine directly connected to the aromatic ring are also formed. 相似文献