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101.
102.
Peter Dauvergne 《环境政策》2018,27(4):579-597
Emerging environmental norms gain strength and diffuse more quickly when scientific evidence of harm is consolidating, when activism is intensifying, and when political and corporate resistance is relatively weak. The anti-microbead norm – that plastic microbeads should be removed from personal care products – has been gaining global influence since 2012; witness the upsurge in anti-microbead activism, public concern, voluntary corporate phasedowns and governmental bans. By 2018, the world was on track to eliminate microbeads from ‘rinse-off’ products within a decade, reducing microplastics flowing into oceans by 1–2%. This confirms the power of environmental norms, but how and why this phaseout is occurring – unequally across jurisdictions, with firms creating loopholes, missing deadlines and limiting the scope of reforms – also reveals innate weaknesses of bottom-up, ad hoc norm diffusion as a way of improving marine governance. These weaknesses are heightened when economic stakes are high, solutions are complex and costly, authority is fragmented across jurisdictions and corporate resistance is strong. 相似文献
103.
在分析废旧塑料再生利用工艺过程的基础上,确定了废塑料综合利用工艺的产污节点,并通过物流平衡和水平衡计算,得出了总的产排污量,为环境保护措施提供重要依据,以实现保护环境和资源合理再生利用。 相似文献
104.
Masaaki Fukushima Misao Shioya Keiji Wakai Hidetoshi Ibe 《Journal of Material Cycles and Waste Management》2009,11(1):11-18
Sapporo Plastics Recycling Co., Ltd., (SPR) started its commercial operation of waste plastics liquefaction in 2000. At first
only hydrocarbon oil was reclaimed, this being derived from the waste plastics liquefaction process under the Japanese Containers
and Packaging Recycling Law. Presently, thermal degradation residue and hydrochloric acid are being produced as by-products
in addition to the hydrocarbon oil. As a result, the SPR plastics liquefaction plant has achieved a high reclamation rate
of 96%, and 93% of the recycled products have been reused in Hokkaido, where SPR is located. The technical problems caused
by corrosion and clogging have been solved.
Chemical Feedstock Recycling & Other Innovative Recycling Techniques 6 相似文献
105.
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107.
生物接触氧化法处理选矿废水的影响因素 总被引:1,自引:0,他引:1
选矿废水主要来源于有色金属矿山,具有水量大、悬浮物浓度高、重金属浓度高、有机浮选药剂浓度高等明显特征。选矿废水若直接排放,对环境的危害相当大。采用生物接触氧化法对模拟选矿废水进行了处理实验研究,考察了不同工艺条件对苯胺黑药、黄药及乙硫氮等浮选药剂去除效果的影响,结果表明:接触氧化反应器的最佳停留时间为8 h,进水最佳pH为6~7,葡萄糖投加量为0.1 mg/L时,降解效果达到最佳;此外,接触氧化反应器中微生物承受硫化物的浓度可达到120 mg/L。 相似文献
108.
109.
废纸浆造纸废水处理工程实践 总被引:1,自引:0,他引:1
针对造纸废水中CODCr,SS等浓度较高的特征,以某年产5万t包装纸厂为例,采用水解酸化-CASS-气浮联合工艺处理某废纸纸浆造瓦楞纸项目废水,一年多的运行结果表明:整个废水处理系统的CODCr去除率大于97%,出水中CODCr,BOD5和SS质量浓度分别为60-80mg/L,10-20mg/L和60-80mg/L。整个废水系统投资和运行费用低,投资规模在0.05-0.06万元/(m^3·d),运行费用≤0.6元/m^3。 相似文献
110.
The possibility of transforming waste plastics into valuable hydrocarbons via catalytic cracking and reforming is attracting
increasing interest. Pyrolysis coupled with Gas Chromatographic separation and Mass Spectrometry detection (Py-GC/MS) has
been used in this work to study the product selectivity of various catalysts in the conversion of pure and residual polyethylene
samples into hydrocarbon products. Five acid solids of comparable aluminium contents but different textural and acid properties
were tested as catalysts, including three zeolites (standard ZSM-5, nanocrystalline n-ZSM-5 and Beta) and two mesostructured
solids (Al-MCM-41 and Al-SBA-15). Thermal cracking of the pure and residual polymers generated a similar range of products
to each other, with a high proportion of linear paraffins and olefins of varying lengths. The presence of zeolitic materials
resulted in complete elimination of heavy linear products, an increase in the light hydrocarbon fraction and a marked selectivity
towards the formation of single-ring aromatic species, particularly benzene, toluene and xylene. Aromatic formation was particularly
notable with the small crystal size n-ZSM-5 (aromatic selectivity up to 53.9%) and less marked in the case of standard ZSM-5
(up to 36.4%) and Beta zeolite (up to 35.0%). Mesostructured catalysts like Al-MCM-41 and Al-SBA-15 favoured the production
of light C2–C5 hydrocarbons (up to 57.9%) while the formation of aromatic products was significantly lower than with zeolitic materials.
The paper examines the extent and the causes for this product selectivity and discusses its connection with the acid and textural
properties of each catalyst. It was also observed that, under the experimental conditions employed, the products generated
were not significantly affected by the nature and origin of the polymers employed. 相似文献