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排序方式: 共有127条查询结果,搜索用时 619 毫秒
112.
研究了Na2S2O8(0.1-2 mmol·L-1)、Cu2+/Zn2+(0.1-0.9 mg·L-1)单独对于水中的总细菌杀灭的效果,以及Cu2+/Na2S2O8、Zn2+/Na2S2O8和Cu2+/Zn2+与Na2S2O8协同杀灭总细菌效果.在CU2+/Na2S2O8体系中,Cu2+/Na2S2O8杀菌率随Cu2+... 相似文献
113.
采用零价铁(ZVI)活化过硫酸钠(PS)产生·SO_4~-,以·SO_4~-为氧化剂深度处理电镀添加剂生产废水。考察了废水p H、n(ZVI)∶n(PS)、c(S_2O_8~(2-))和反应温度对废水COD去除率的影响。实验得出废水处理的最佳工艺条件:废水p H为5.0,n(ZVI)∶n(PS)=1.00,c(S_2O_8~(2-))=15 mmol/L,反应温度为50℃。在此最佳工艺条件下反应60 min,COD去除率达到76.8%,出水COD约为42 mg/L,满足GB 18918—2002《城镇污水处理厂污染物排放标准》的一级标准要求。 相似文献
114.
With economic development, the Chinese steel industry has rapidly expanded over the past three decades. However, this expansion has resulted in many problems, such as increasing energy consumption and excessive environmental pollution. Therefore, it is important to analyze the future steel demand in China. This study presents changes in steel production and apparent steel consumption in the years 1998–2010. Steel is mainly consumed by construction, machinery, automobiles, shipbuilding, railways, petroleum, household appliances and containers, and these nine industries are analyzed separately using stock based models. The study suggests steel demand in China will rise from 600 million t in 2010 to a peak of 753 million t in 2025, and then gradually decrease to 510 million t in 2050. The construction industry is the largest steel consumer, although its share of total steel demand will decrease in the future. Steel demand in automobile manufacturing, by contrast, will increase rapidly before 2035, and its share will increase from 6.0% in 2010 to 19.0% in 2050. Sensitivity analysis on the four major impact factors such as saturation levels, lifetime distributions, GDP and urbanization rate shows that saturation levels of different products greatly affect long-term and short-term steel demands, while GDP and lifetime distributions, especially the lifetime distribution of buildings, mainly affect the short-term and long-term steel demands, respectively. 相似文献
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Trace metal (Cr, Ni, Cu, Zn, Cd and Pb) exposures, distribution and bioaccumulation were investigated in marine organisms from Guangdong coastal regions, South China. The results showed that all of the selected metals were observed in marine organisms with a predomination of Cu and Zn. The metal exposure levels exhibited obvious variations between species with the decreasing order of crab>shellfish>shrimp>fish. The higher metals enrichment seen in shellfish and crab species primarily attributed to their living habits and the higher sediment background values of trace metals. Endpoint bioaccumulation factor (BAFfd) was used to characterize the bioaccumulation potentials of marine organisms to trace metals, of which Cu and Zn were the most accumulated elements. The exposure of trace metals in the cultured organisms was far lower than those in wild marine organisms, which is probably due to the effect of growth dilution. Comparisons with previous studies demonstrated that the concentration profiles of most trace metals declined over the last one to two decades, except Cu, that increased indistinctively. 相似文献
117.
Yun Chen Da Ouyang Wenying Zhang Jingchun Yan Linbo Qian Lu Han Mengfang Chen 《环境科学学报(英文版)》2020,32(4):87-97
A novel insight on the role of interactions between target pollutants and the catalyst in the copper-containing layered double oxide(LDO)-catalyzed persulfate(PS) system was elucidated in the present study.4-Chlorophenol(4-CP),as a representative benzene derivative with a hydroxyl group,was completely removed within 5 min,which was much faster than the reaction of monochlorobenzene(MCB) without a hydroxyl group,with the degradation efficiency of 31.7% in 240 min.Through the use of radical quenching and surface inhibition experiments,it could be concluded that the interaction between 4-CP and CuMgFe-LDO,rather than free radicals,played a key role in the decomposition of 4-CP,while only the free radicals participated in the MCB degradation process.According to electron paramagnetic resonance and Xray photoelectron spectroscopy data,the formation of a Cu(II)-complex between phenolic hydroxyl groups and surface Cu(II) was primarily responsible for the degradation of phenolic compounds,in which PS accepted one electron from the complex and generated sulfate radicals and chelated radical cations.The chelated radical cations transferred one electron to Cu(Ⅱ) followed by Cu(I) generation and pollutant degradation successively. 相似文献
118.
Lining Wang Wenying Chen XunZhang Pan Nan Li Huan Wang Danyang Li Han Chen 《Mitigation and Adaptation Strategies for Global Change》2018,23(8):1207-1223
Global climate change mitigation needs all countries’ efforts under the United Nations Framework Convention on Climate Change’s guideline of equity and common but differentiated responsibilities and respective capabilities. The medium-to-long term regional emissions pathways simulated by integrated assessment models with global mitigation costs minimized to achieve the 2 °C goal might be very different from the regional emissions allowances allocated based on effort-sharing principles. Global carbon trading is a cost-effective mechanism to bridge the gap. Insight of previous papers has mainly focused on the impact of a single effort-sharing scheme on global carbon market, while this study attempts to explore the scale and benefit of global carbon market under different effort-sharing principles to achieve the 2 °C goal, with the application of a consistent modeling framework, consisting of an integrated assessment model and an effort-sharing platform. The results indicate that scale of global carbon market would be highly related with the effort-sharing principles. The global trading volumes would change from 1.8 Gigatons (Gt) carbon dioxide (CO2) to over 12 GtCO2 per year and largely peak between 2030 and 2040 under different kinds of effort-sharing principles. Correspondingly, annual global finance flows in the carbon market would increase gradually and reach the scale of hundreds of billions United States (US) dollars since 2020. Global carbon market would lower the abatement costs of developed countries, and the overall global abatement costs would drop by 0.4–2.6% during 2011–2050. The developing countries would not only acquire revenues from global carbon trading but also be provided with an opportunity to accelerate their domestic low-carbon energy transformation, local environmental improvement, job creation, and economic development. Linking national and regional carbon markets to develop global carbon market will be critical to maximize the utility of the market mechanism. 相似文献
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巴西提案是巴西代表团在联合团气候变化谈判中,提出的一套系统的全新的对中国家有利的理论体系,文章在对巴西提案中的有效排放量、简单气候模式、斐和限额分配方法、消沽发展基金等,进行深入睥评价的基础上,提出应将有效排放量与人均排放量与有机结合, 交圾效人均排放量曙室气体限排目标的指标。 相似文献