全文获取类型
收费全文 | 1481篇 |
免费 | 190篇 |
国内免费 | 1047篇 |
专业分类
安全科学 | 147篇 |
废物处理 | 207篇 |
环保管理 | 100篇 |
综合类 | 1523篇 |
基础理论 | 304篇 |
污染及防治 | 392篇 |
评价与监测 | 32篇 |
社会与环境 | 11篇 |
灾害及防治 | 2篇 |
出版年
2024年 | 5篇 |
2023年 | 33篇 |
2022年 | 89篇 |
2021年 | 97篇 |
2020年 | 88篇 |
2019年 | 111篇 |
2018年 | 120篇 |
2017年 | 109篇 |
2016年 | 117篇 |
2015年 | 145篇 |
2014年 | 175篇 |
2013年 | 178篇 |
2012年 | 188篇 |
2011年 | 162篇 |
2010年 | 117篇 |
2009年 | 154篇 |
2008年 | 83篇 |
2007年 | 143篇 |
2006年 | 109篇 |
2005年 | 82篇 |
2004年 | 55篇 |
2003年 | 61篇 |
2002年 | 60篇 |
2001年 | 46篇 |
2000年 | 30篇 |
1999年 | 42篇 |
1998年 | 22篇 |
1997年 | 18篇 |
1996年 | 20篇 |
1995年 | 12篇 |
1994年 | 15篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
排序方式: 共有2718条查询结果,搜索用时 15 毫秒
41.
《环境科学学报(英文版)》2023,35(4):396-407
Based on the experimental and theoretical methods, the NO selective catalytic oxidation process was proposed. The experimental results indicated that lattice oxygen was the active site for NO oxide over the -MnO2(110) surface. In the theoretical study, DFT (density functional theory) and periodic slab modeling were performed on an -MnO2(110) surface, and two possible NO oxidation mechanisms over the surface were proposed. The non-defect -MnO2(110) surface showed the highest stability, and the surface Os (the second layer oxygen atoms) position was the most active and stable site. O2 molecule enhanced the joint adsorption process of two NO molecules. The reaction process, including O2 dissociation and O=N-O-O-N=O formation, was calculated to carry out the NO catalytic oxidation mechanism over -MnO2(110). The results showed that NO oxidation over the -MnO2(110) surface exhibited the greatest possibility following the route of O=N-O-O-N=O formation. Meanwhile, the formation of O=N-O-O-N=O was the rate-determining step. 相似文献
42.
43.
IntroductionChlorinatedorganiccompoundshavebeenusedonalargescaleinthechemical,petrochemical,andelectronicindustries.Inrecentyears ,worldwideattentionhasbeengiventotheenvironmentalandhealthimpactofthemasaclassofcontaminants .Severalareknowntocauseozonedepletion ,whileothersproduceadverseeffectsonthehumancentralnervoussystemandhavebeenlinkedtodiseasessuchascancer.Almostallofthechlorinatedaromaticcompoundsaretoxicandthermallystable .Oncereleasedintoenvironment,theywillaccumulateinthesurroundings… 相似文献
44.
利用硫铁矿渣(灰)制取海绵铁 总被引:2,自引:0,他引:2
结合硫酸生产的特点,充分利用废热的方法,提出一种采用流态化技术,还原回收硫铁矿渣(灰)中铁元素的工艺流程,并对流程中的流态化还原炉进行了初步的物料,热理衡算,同时对该工艺流程技术经济比较作了小结。认为此工艺流程技术可靠,有直接经济效益,对综合利用硫铁矿渣(灰)中的铁元素,消除渣(灰)对环境的污染,有着深远的意义。 相似文献
45.
利用XPS研究复合氧化物催化剂在汽车尾气净化中硫中毒及抗硫中毒机理 总被引:1,自引:0,他引:1
运用XPS分析方法研究一系列复合氧化物催化剂中毒前后硫在其表面的各种形态及催化剂活性组分中毒前后的组成,价态,化学机理及其变化。结果表明,SO2在催化剂活性中心进行化学吸附,然后一部分SO2与活性组分生成相应的亚硫酸盐和硫酸盐,从而使催化剂失活。 相似文献
46.
Yan Xu Danyi Zhang Qingju Xue Chibin Bu Yajun Wang Benchi Zhang Ying Wang Qingdong Qin 《环境科学学报(英文版)》2023,35(4):1-16
To understand the long-term performance of bioretention systems under sulfamethoxazole (SMX) stress, an unplanted bioretention system (BRS) and two modified BRSs with coconut-shell activated carbon (CAC) and CAC/zero-valent-iron (Fe0) granules (CAC-BRS and Fe/CAC-BRS) were established. Both CAC-BRS and Fe/CAC-BRS significantly outperformed BRS in removing total nitrogen (TN)(CAC-BRS:82.48%; Fe/CAC-BRS:78.08%; BRS:47.51%), total phosphorous (TP)(CAC-BRS:79.36%; Fe/CAC-BRS:98.26%; BRS:41.99%),and... 相似文献
47.
《环境科学学报(英文版)》2023,35(4):263-274
The cryptomelane-type manganese oxide (OMS-2)-supported Co (xCo/OMS-2; x = 5, 10, and 15 wt.%) catalysts were prepared via a pre-incorporation route. The as-prepared materials were used as catalysts for catalytic oxidation of toluene (2000 ppmV). Physical and chemical properties of the catalysts were measured using the X-ray diffraction (XRD), Fourier transform infrared spectroscopic (FT-IR), scanning electron microscopic (SEM), X-ray photoelectron spectroscopy (XPS), and hydrogen temperature-programmed reduction (H2-TPR) techniques. Among all of the catalysts, 10Co/OMS-2 performed the best, with the T90%, specific reaction rate at 245°C, and turnover frequency at 245°C (TOFCo) being 245°C, 1.23 × 10−3 moltoluene/(gcat·sec), and 11.58 × 10−3 sec−1 for toluene oxidation at a space velocity of 60,000 mL/(g·hr), respectively. The excellent catalytic performance of 10Co/OMS-2 were due to more oxygen vacancies, enhanced redox ability and oxygen mobility, and strong synergistic effect between Co species and OMS-2 support. Moreover, in the presence of poisoning gases CO2, SO2 or NH3, the activity of 10Co/OMS-2 decreased for the carbonate, sulfate and ammonia species covered the active sites and oxygen vacancies, respectively. After the activation treatment, the catalytic activity was partly recovered. The good low-temperature reducibility of 10Co/OMS-2 could also facilitate the redox process accompanied by the consecutive electron transfer between the adsorbed O2 and the cobalt or manganese ions. In the oxidation process of toluene, the benzoic and aldehydic intermediates were first generated, which were further oxidized to the benzoate intermediate that were eventually converted into H2O and CO2. 相似文献
48.
49.
The Finnish anthropogenic CH4 emissions in 1990 are estimated to be about 250 Gg, with an uncertainty range extending from 160 to 440 Gg. The most important sources are landfills and animal husbandry. The N2O emissions, which come mainly from agriculture and the nitric acid industry are about 20 Gg in 1990 (uncertainty range 10–30 Gg). The development of the emissions to the year 2010 is reviewed in two scenarios: the base and the reduction scenarios.According to the base scenario, the Finnish CH4 emissions will decrease in the near future. Emissions from landfills, energy production, and transportation will decrease because of already decided and partly realized volume and technical changes in these sectors. The average reduction potential of 50%, as assumed in the reduction scenario, is considered achievable.N2O emissions, on the other hand, are expected to increase as emissions from energy production and transportation will grow due to an increasing use of fluidized bed boilers and catalytic converters in cars. The average reduction potential of 50%, as assumed in the reduction scenario, is optimistic.Anthropogenic CH4 and N2O emissions presently cause about 30% of the direct radiative forcing due to Finnish anthropogenic greenhouse gas emissions. This share would be even larger if the indirect impacts of CH4 were included. The contribution of CH4 can be controlled due to its relatively short atmospheric lifetime and due to the existing emission reduction potential. Nitrous oxide has a long atmospheric lifetime and its emission control possiblities are limited consequently, the greenhouse impact of N2O seems to be increasing even if the emissions were limited somehow. 相似文献
50.