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71.
In order to explore the biodegradation behavior of nonylphenolic compounds during wastewater treatment processing, two full-scale wastewater treatment plants were investigated and batch biodegradation experiments were conducted. The biodegradation pathways under the various operational conditions were identified from batch experiments: shortening of ethoxy-chains dominated under the anaerobic condition, whereas oxidizing of the terminal alcoholic group prevailed over the other routes under the aerobic condition. Results showed that the anoxic condition could accelerate the biodegradation rates of nonylphenolic compounds, but had no influence on the biodegradation pathway. The biodegradation rates of nonylphenol (NP) and short-chain nonylphenol polyethoxylates (NPnEOs, n: number of ethoxy units) increased from the anaerobic condition, then the anoxic, finally to the aerobic condition, while those of long-chain NPnEOs and nonylphenoxy carboxylates (NPECs) seemed similar under the various conditions. Under every operational condition, long-chain NPnEOs showed the highest biodegradation activity, followed by NPECs and short-chain NPnEOs, whereas NP showed relatively recalcitrant characteristics especially under the anaerobic condition. In addition, introducing sulfate and nitrate to the anaerobic condition could enhance the biodegradation of NP and short-chain NPnEOs by supplying more positive redox potentials. 相似文献
72.
VOCs污染场地挖掘过程的环境健康风险评价 总被引:1,自引:0,他引:1
开展了在典型污染场地修复过程中VOCs散逸浓度检测实验,并且建立了3条暴露途径对修复过程进行健康风险评价.结果表明,单污染物多途径累计非致癌指数最高的是四氯化碳,高达8.86E+01,其对综合非致癌影响贡献率为74.45%.多污染物质同一暴露途径危害指数最高的是呼吸暴露途径:1.01E+02,占综合危害指数的84.87%,非致癌综合危害指数为1.19E+02.单污染物多途径累计致癌指数最高的是1,2-二氯乙烷:3.08E-02,其对综合致癌影响贡献率为69.53%.多污染物质同一暴露途径危害指数最高的是呼吸暴露途径:3.96E-02,占综合致癌指数的89.39%,总致癌危害指数达到4.43E-02. 相似文献
73.
以珠江三角洲5市(广州、深圳、佛山、惠州和肇庆)生活垃圾为研究对象,分析了55个生活垃圾样品的干基组分及典型重金属(As、Cd、Hg、Cr和Pb)的含量,采用主成分因子分析探论重金属的主要影响因素及可能来源,并结合人体健康风险评价模型,用蒙特卡洛模拟定量评价生活垃圾收运、分类及处理各环节环卫工人的健康风险.结果表明,珠江三角洲5市生活垃圾中As、Cd、Hg、Cr和Pb的浓度分别为(4.49±1.18),(1.95±1.96),(0.41±0.60),(147.28±160.48)和(121.59±199.42) mg/kg;生活垃圾中Hg和Pb可能主要来源于金属制品和镀金材料;Cd和Cr可能主要来源于金属制品、镀金材料、快餐垃圾和包装垃圾;As可能主要来源于生活垃圾中的沙土和草木组分.生活垃圾的收运、分类及处理环节,街道清扫保洁工人、分类收运工人和填埋处理工人的非致癌风险基本不用考虑,但致癌风险很高,致癌风险指数最高可达安全阈值的6倍,主要风险暴露途径为手-口摄入(非食物途径);垃圾焚烧处理工人的非致癌风险和致癌风险均很高,非致癌风险和致癌风险指数最高值分别约为安全阈值的11倍和90倍,主要风险暴露途径为手-口摄入和呼吸吸入;相同暴露环境下,女环卫工人的非致癌风险和致癌风险概率均略高于男环卫工人.因此,生活垃圾收运、分类及处理环节需做好安全防范措施,对重金属人体暴露途径进行阻隔. 相似文献
74.
Wenming Dong Jiamin Wan Tetsu K. Tokunag Benjamin Gilbert Kenneth H. Williams 《环境科学学报(英文版)》2017,29(7):24-32
In order to understand the transport and humification processes of dissolved organic matter(DOM) within sediments of a semi-arid floodplain at Rifle,Colorado,fluorescence excitation–emission matrix(EEM) spectroscopy,humification index(HIX) and specific UV absorbance(SUVA) at 254 nm were applied for characterizing depth and seasonal variations of DOM composition.Results revealed that late spring snowmelt leached relatively fresh DOM from plant residue and soil organic matter down into the deeper vadose zone(VZ).More humified DOM is preferentially adsorbed by upper VZ sediments,while non-or lesshumified DOM was transported into the deeper VZ.Interestingly,DOM at all depths undergoes rapid biological humification process evidenced by the products of microbial by-product-like(i.e.,tyrosine-like and tryptophan-like) matter in late spring and early summer,particularly in the deeper VZ,resulting in more humified DOM(e.g.,fulvic-acid-like and humic-acid-like substances) at the end of year.This indicates that DOM transport is dominated by spring snowmelt,and DOM humification is controlled by microbial degradation,with seasonal variations.It is expected that these relatively simple spectroscopic measurements(e.g.,EEM spectroscopy,HIX and SUVA) applied to depth-and temporally-distributed pore-water samples can provide useful insights into transport and humification of DOM in other subsurface environments as well. 相似文献
75.
Solid-state 15N NMR was applied to the aqueous extracts of a 13C-enriched plant slurry (Lolium perenne), anaerobically incubated with 15N3-trinitrotoluene (TNT). Almost all 15N3-TNT transformation products became covalently bound to the plant-derived organic material extractable with water. DCPMAS
15N 13C NMR revealed a three-step reaction scheme. After reduction of TNT, the aryl amines are acetylated. Subsequent alkylation
of the resulting amides strengthens the incorporation of TNT-transformation products into humic material. Comparable results
have been recently obtained under aerobic conditions, which indicates that this pathway is a common process during biological
TNT transformation. 相似文献
76.
Carmen Difiglio Dolf Gielen 《Mitigation and Adaptation Strategies for Global Change》2007,12(3):387-405
If hydrogen (H2) is to significantly reduce greenhouse gas emissions and oil use, it needs to displace conventional transport fuels and be
produced in ways that do not generate significant greenhouse gas emissions. This paper analyses alternative ways H2 can be produced, transported and used to achieve these goals. Several H2 scenarios are developed and compared to each other. In addition, other technology options to achieve these goals are analyzed.
A full fuel cycle analysis is used to compare the energy use and carbon (C) emissions of different fuel and vehicle strategies.
Fuel and vehicle costs are presented as well as cost-effectiveness estimates. Lowest hydrogen fuel costs are achieved using
fossil fuels with carbon capture and storage. The fuel supply cost for a H2 fuel cell car would be close to those for an advanced gasoline car, once a large-scale supply system has been established.
Biomass, wind, nuclear and solar sources are estimated to be considerably more expensive. However fuel cells cost much more
than combustion engines. When vehicle costs are considered, climate policy incentives are probably insufficient to achieve
a switch to H2. The carbon dioxide (CO2) mitigation cost would amount to several hundred US$ per ton of CO2. Energy security goals and the eventual need to stabilize greenhouse gas concentrations could be sufficient. Nonetheless,
substantial development of related technologies, such as C capture and storage will be needed. Significant H2 use will also require substantial market intervention during a transition period when there are too few vehicles to motivate
widely available H2 refueling.
相似文献
Dolf GielenEmail: |
77.
78.
Mahsa Kheirandish Chunjiang An Zhi Chen Xiaolong Geng Michel Boufadel 《Frontiers of Environmental Science & Engineering》2022,16(5):61
79.
2015—2020年成渝地区各城市PM2.5浓度(国控点监测数据)下降显著,但重庆市、川东北城市群及川南城市群PM2.5污染问题依然存在,且存在一定的传输影响关系.以重庆市为例,使用HYSPLIT模型计算了2015—2020年秋冬季PM2.5污染期间气流后向轨迹,利用轨迹聚类和潜在源贡献算法,分析了不同年份的PM2.5输送特征.结果表明:重庆市PM2.5污染主要受西偏南方向(约占58%,长距离为主)、北偏西方向(约占26%,中距离为主)和南略偏西方向(约占16%,短距离为主)传输影响;川东北城市群和川南城市群对重庆市PM2.5污染传输贡献较为显著,6年平均贡献率分别为23%和15%;不同年份的污染传输贡献差异明显,2015—2017年以川南城市群污染传输为主(平均贡献24%),2018—2020年以川东北城市群污染传输为主(平均贡献37%),川渝以外污染传输影响逐年减弱(平均贡献由33%降至5%).在“成渝双城经济圈”背景下,重庆市与周边川东北城市群及川南... 相似文献
80.
Andrea Cucco Georg Umgiesser Cristian Ferrarin Angelo Perilli Donata Melaku Canu Cosimo Solidoro 《Ecological modelling》2009
In this work the flushing features of a tidal active coastal basin, the Venice lagoon, have been investigated. The water transport time scale (TTS) has been computed by means of both an eulerian and a lagrangian approach. The obtained results have been compared in order to identify the main differences between the two methods. 相似文献