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251.
The disappearance and modeling of the ozonation of 2,4,6-trichlorophenol (TCP) was studied under different initial TCP concentrations and initial pH levels. The ozonation of TCP was found to follow a pseudo-first-order reaction. The degradation rates increased with the initial pH, and decreased with initial TCP concentration. 2,6-Dichlorohydroquinone was identified as the major intermediate, indicating that dechlorination and hydroxylation co-occurred during TCP ozonation. A model was proposed to quantitatively predict the pseudo-first-order rate constants under different initial TCP concentration and different initial pH levels. The proposed model can successfully describe the reaction; therefore another practical equation was proposed to predict the TCP removal rate at any detention time, which has high potential for practical applications and reactor design. 相似文献
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The determination of alkanolamines and glycols in groundwater and subsurface environments is essential for environmental assessment, remediation and monitoring for selected industrial sites. Monoethanolamine (MEA), ammonium, sodium, magnesium and calcium detection was performed using cation exchange chromatography (IC) with suppressed conductivity detection. Acetate, chloride, nitrite, nitrate, phosphate, sulfate and oxalate were monitored employing anion exchange chromatography with suppressed conductivity. Detection of ethylene glycol (MEG) and triethylene glycol (TEG) and ethanol was carried out using ion exclusion chromatography with pulsed amperometric detection. Effective determination of MEA, MEG and TEG in complex groundwater matrices without compound transformation offered improved monitoring capabilities. This study presents robust analytical tools for MEA, MEG and TEG determination in biodegradation studies. Using ion chromatography offered significant advantages for the analyses of groundwater samples and laboratory bioreactor monitoring. 相似文献
256.
为了研究南京市PM2.5的污染特征及来源贡献,于2018年3月至2019年2月在南京仙林地区进行PM2.5组分的在线监测,运用PMF和CMB受体模型,开展PM2.5的来源解析.结果表明,观测期间南京市PM2.5平均质量浓度为54.3μg/m3,其中冬季平均浓度76.4μg/m3.PM2.5的主要组分为NO3-(21.3%~30.8%)、SO42-(18.9%~23.5%)、NH4+(14.3%~16.2%).从全年平均来看,PMF模型得到的PM2.5解析结果为:二次无机气溶胶(54.9%)、燃煤源(17.4%)、二次有机气溶胶(7.4%)、机动车排放源(7.1%)、工业源(4.9%)、扬尘源(4.8%)、其他源(3.4%);CMB模型得到的PM2.5解析结果为:硝酸盐(33.0%)、硫酸盐(24.0%)、燃煤源(16.4%)、机动车排放源(8.4%)、二次有机气溶胶(7.1%)、扬尘源(5.7%)、其他源(2.9%)、工业源(2.4%).不同季节PM2.5来源有所差异,夏冬季二次无机气溶胶占比大于春秋季,春冬季燃煤占比最大,二次有机气溶胶在秋季占比最大.结合2017年南京市大气污染源排放清单,对二次气溶胶贡献进行再解析,得到南京仙林地区PM2.5主要贡献来自燃煤源(PMF:34.14%,CMB:33.82%),机动车排放源(PMF:27.33%,CMB:29.33%)以及工业源(PMF:26.76%,CMB:24.77%).可见,影响南京仙林地区PM2.5的污染源主要来自燃煤源、机动车排放源和工业源,基于在线组分监测、利用PMF和CMB模型得到的PM2.5源解析结果具有较好的一致性. 相似文献
257.
淄博深层灰岩裂隙含水层遭受石油污染已有30年,含水层中微生物降解对污染物的去除起到重要的作用,目前有关深层灰岩裂隙含水层中微生物群落结构和多样性的相关研究较少。本文采用高通量测序技术对研究区灰岩岩溶裂隙介质表面及地下水中的微生物种群结构进行了研究,对石油降解菌的种群特征及多样性进行了探讨,并利用RDA对典型石油降解菌与理化因子的相关性进行了分析。结果表明,含水层中的菌群主要属于变形菌门(Proteobacteria)和子囊菌门(Ascomycota),且地下水比灰岩岩溶裂隙介质表面呈现出更高的生物多样性;含水层中石油降解细菌主要属于脱硫弧菌属(Desulfovibrio)、类诺卡氏菌属(Nocardioides)、假黄色单胞菌属(Pseudoxanthomonas)等,石油降解真菌主要来自煤炱目(Capnodiales)、座囊菌目(Dothideales)、银耳目(Tremellales)中的菌种;地下水中的石油降解细菌、真菌与总石油烃(TPH)、全磷(TP)和全氮(TN)的相关性比灰岩岩溶裂隙介质更高。 相似文献
258.
Kazemi Mehdi Bozorg-Haddad Omid Fallah-Mehdipour Elahe Chu Xuefeng 《Environment, Development and Sustainability》2022,24(1):1188-1206
Environment, Development and Sustainability - Water resources allocation policies can create cooperation or tension among different stakeholders in a large basin. Thus, integrated water resources... 相似文献
259.
Biwu Chu Yongchun Liu Qingxin M Jinzhu M Hong He Gang Wang Shuiyuan Cheng Xinming Wang 《环境科学学报(英文版)》2016,28(1):52-61
In order to evaluate the secondary aerosol formation potential at a suburban site of Beijing,in situ perturbation experiments in a potential aerosol mass(PAM) reactor were carried out in the winter of 2014.The variations of secondary aerosol formation as a function of time,OH exposure,and the concentrations of gas phase pollutants and particles were reported in this study.Two periods with distinct secondary aerosol formation potentials,marked as Period Ⅰ and Period Ⅱ,were identified during the observation.In Period Ⅰ,the secondary aerosol formation potential was high,and correlated well to the air pollutants,i.e.,SO_2,NO_2,and CO.The maximal secondary aerosol formation was observed with an aging time equivalent to about 3 days of atmospheric oxidation.In period Ⅱ,the secondary aerosol formation potential was low,with no obvious correlation with the air pollutants.Meanwhile,the aerosol mass decreased,instead of showing a peak,with increasing aging time.Backward trajectory analysis during the two periods confirmed that the air mass in Period Ⅰwas mainly from local sources,while it was attributed mostly to long distance transport in Period Ⅱ.The air lost its reactivity during the long transport and the particles became highly aged,resulting in a low secondary aerosol formation potential.Our experimental results indicated that the in situ measurement of the secondary aerosol formation potential could provide important information for evaluating the contributions of local emission and long distance transport to the aerosol pollution. 相似文献
260.