全文获取类型
收费全文 | 1213篇 |
免费 | 76篇 |
国内免费 | 497篇 |
专业分类
安全科学 | 87篇 |
废物处理 | 57篇 |
环保管理 | 126篇 |
综合类 | 700篇 |
基础理论 | 230篇 |
污染及防治 | 404篇 |
评价与监测 | 70篇 |
社会与环境 | 51篇 |
灾害及防治 | 61篇 |
出版年
2024年 | 2篇 |
2023年 | 27篇 |
2022年 | 82篇 |
2021年 | 58篇 |
2020年 | 60篇 |
2019年 | 48篇 |
2018年 | 56篇 |
2017年 | 75篇 |
2016年 | 53篇 |
2015年 | 60篇 |
2014年 | 90篇 |
2013年 | 119篇 |
2012年 | 100篇 |
2011年 | 127篇 |
2010年 | 83篇 |
2009年 | 84篇 |
2008年 | 78篇 |
2007年 | 67篇 |
2006年 | 78篇 |
2005年 | 56篇 |
2004年 | 38篇 |
2003年 | 30篇 |
2002年 | 48篇 |
2001年 | 36篇 |
2000年 | 46篇 |
1999年 | 36篇 |
1998年 | 21篇 |
1997年 | 25篇 |
1996年 | 16篇 |
1995年 | 17篇 |
1994年 | 11篇 |
1993年 | 20篇 |
1992年 | 10篇 |
1991年 | 10篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有1786条查询结果,搜索用时 15 毫秒
951.
Ceburnis D Yin J Allen AG Jennings SG Harrison RM Wright E Fitzpatrick M Healy T Barry E 《Journal of environmental monitoring : JEM》2006,8(4):479-487
An intensive two month measurement campaign has been performed during a two year study of major component composition of urban PM10 and PM2.5 in Ireland (J. Yin, A. G. Allen, R. M. Harrison, S. G. Jennings, E. Wright, M. Fitzpatrick, T. Healy, E. Barry, D. Ceburnis and D. McCusker, Atmos. Res., 2005, 78(3-4), 149-165). Measurements included size-segregated mass, soluble ions, elemental carbon (EC) distributions, fine and coarse fraction organic carbon (OC) and major gases along with standard meteorological measurements. The study revealed that urban emissions in Ireland had mainly a local character and therefore were confined within a limited area of 20-30 km radius, without significantly affecting regional air quality. Gaseous measurements have shown that urban emissions in Ireland had clear, but fairly limited influence on the regional air quality due to favorable mixing conditions at higher wind speeds, in particular from the western sector. Size-segregated mass and chemical measurements revealed a clear demarcation size between accumulation and coarse modes at about 0.8 microm which was constant at all sites. Carbonaceous compounds at the urban site accounted for up to 90% of the particle mass in a size range of 0.066-0.61 microm. Nss SO4(2-) concentrations in PM2.5 were only slightly higher at the urban site compared to the rural or coastal sites, while NO3- and NH4+ concentrations were similar at the urban and coastal sites, but were a factor of 2 to 3 higher than at the rural site. OC was highly variable between the sites and revealed clear seasonal differences. Natural or biogenic OC component accounted for <10% in winter and up to 30% in summer of the PM2.5 OC at urban sites. A contribution of biogenic OC component to PM2.5 OC mass at rural site was dominant. 相似文献
952.
953.
射阳河底泥重金属沿程变化分析及污染评价 总被引:2,自引:0,他引:2
分析了射阳河流域沿程20个底泥样品中6种重金属(Cr、Pb、Ni、Zn、Cu、As)的含量,并应用地累积指数法对其进行了污染评价。研究结果表明:除As在近一半的采样点没有污染,其他重金属污染均普遍存在,但多数属于轻度污染。Zn污染最为严重,几乎全程都是偏中等或中等以上的污染。纵观射阳河全程样品FN04,SY07污染最为严重,前者与其支流西塘河的污染有关,后者可能与河闸上侧的死水状态有关;黄沙河污染最轻,与河流沉积物粒径比较粗而导致的对重金属吸附能力减弱有关。 相似文献
954.
955.
956.
从含油废水中筛选分离到1株原油降解菌XD-1,鉴定为假单胞菌(Pseuomonas sp.).初步实验表明菌XD-1具有较强的产表面活性剂乳化原油的作用,对该菌的产表面活性剂性能进行了研究.实验证明,菌XD-1所产表面活性剂为脂肽类物质,菌在生长对数期产表面活性剂,表面活性剂的产生为生长相关型;充足的碳源是产表面活性剂的必需条件,菌利用原油为碳源时能持续大量地产表面活性剂;原油和尿素为产表面活性剂的最适碳源和氮源,菌XD-1产表面活性剂的最佳营养培养基组成为葡萄糖10 g,尿素4 g,磷酸二氢钾1 g,微量元素液4 mL,水1 L,pH 8.0. 相似文献
957.
958.
Degradation of rhodamine B by Fe(0)-based Fenton process with H2O2 was investigated. The effects of H2O2 dose, Fe(0) dose, initial concentration of rhodamine B and initial pH value on the degradation of rhodamine B were examined. The results showed that the degradation and mineralization of rhodamine B occurred with low dose of H2O2 and Fe(0). The intermediates of rhodamine B were analyzed with UV-Vis spectrophotometry and ion chromatography and the mechanism of oxidative degradation of rhodamine B was also discussed. The reactive oxygen species (·OH) produced in Fe(0)-based Fenton process with H2O2 is the key to the degradation of rhodamine B by ways of N-de-ethylation, chromophore cleavage, ring-opening and mineralization. 相似文献
959.
960.