全文获取类型
收费全文 | 8412篇 |
免费 | 700篇 |
国内免费 | 2558篇 |
专业分类
安全科学 | 529篇 |
废物处理 | 762篇 |
环保管理 | 1576篇 |
综合类 | 5477篇 |
基础理论 | 1018篇 |
环境理论 | 2篇 |
污染及防治 | 1389篇 |
评价与监测 | 530篇 |
社会与环境 | 328篇 |
灾害及防治 | 59篇 |
出版年
2024年 | 15篇 |
2023年 | 127篇 |
2022年 | 232篇 |
2021年 | 269篇 |
2020年 | 272篇 |
2019年 | 261篇 |
2018年 | 281篇 |
2017年 | 323篇 |
2016年 | 442篇 |
2015年 | 423篇 |
2014年 | 665篇 |
2013年 | 725篇 |
2012年 | 745篇 |
2011年 | 762篇 |
2010年 | 569篇 |
2009年 | 687篇 |
2008年 | 484篇 |
2007年 | 568篇 |
2006年 | 604篇 |
2005年 | 497篇 |
2004年 | 366篇 |
2003年 | 380篇 |
2002年 | 323篇 |
2001年 | 268篇 |
2000年 | 257篇 |
1999年 | 210篇 |
1998年 | 166篇 |
1997年 | 134篇 |
1996年 | 124篇 |
1995年 | 124篇 |
1994年 | 87篇 |
1993年 | 67篇 |
1992年 | 56篇 |
1991年 | 27篇 |
1990年 | 27篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 12篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1979年 | 5篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1973年 | 4篇 |
1971年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
31.
Wong MY Sauser KR Chung KT Wong TY Liu JK 《Environmental monitoring and assessment》2001,67(3):361-378
The green alga Selenastrum capricornutum expresses a uniqueascorbate peroxidase, that responds to copper and lead. Attemptswere made to test if this peroxidase could be used to monitor thelevels of copper and lead in natural waters. When S.capricornutum was exposed to a stormwater sample, the specificactivity of the peroxidase in the cell extract was commensuratewith the combined copper and lead contents in the sample. Theperoxidase responses were also correlated with the 96 hr biomasstoxicity assay of S. capricornutum. However, unlike thebiomass toxicity assay, the peroxidase activity was not affectedby the anions in the samples. The use of this peroxidase can beused as a marker for testing heavy metal toxicity in the water. 相似文献
32.
王瑞慧 《环境监测管理与技术》2007,19(3):56-57
分析了COD在线分析仪和实验室比对结果人为差异的原因是样品不均匀,在线分析仪取样装置滤过,取样层面和采样方式以及沉淀消除的方法不同造成的.提出应在相同的地点、层面和同一容器取样,用相同沉淀消除方法去除样品中氯离子干扰,保证两方法比对中使用水样的一致均匀,使测试结果正确可信. 相似文献
33.
Environmental Impact Assessment of the Mining and Concentration Activities in the Kola Peninsula, Russia by Multidate Remote Sensing 总被引:4,自引:0,他引:4
Rigina O 《Environmental monitoring and assessment》2002,75(1):13-33
On the Kola Peninsula, the mining and concentration industry exerts anthropogenic impact on the environment. Tailing dumps cause airborne pollution through dusting, and waterborne pollution due to direct dumping and accidental releases. The objectives were: (1) to analyse multidate satellite imagesfor 1964–1996 to assess the environmental pollution from themining and concentration activity in the Kola in temporal perspective; (2) to evaluate remote sensing methods for integrated environmental impact assessment. The area of mining and industrial sites steadily expands and amounted to 94 km2 in 1996. The polluted water surface amounted to at least 150 km2 through dumping in 1978 and to 106 km2 in1986 due to dusting. Thus, the impact from the mining and concentration activity should be reconsidered as more significant than it was officially anticipated. In the past the main mechanism of pollution wasdirect dumping into the lakes. Currently and in future, airborne pollution after dusting storms will dominate. The effective recultivation of the tailing dumps will be a long-term process. For effective assessment of impacts from the mining and concentration industry, remote sensing methods should be complemented by in-situ measurements, fieldwork, and mathematical modelling. 相似文献
34.
Mulberry-silkworm food chain--a templet to assess heavy metal mobility in terrestrial ecosystems 总被引:1,自引:0,他引:1
Assessment of the food chain mobility of heavy metals inthe natural ecosystem receives more attention nowadays. Inthe present study, mulberry-silkworm food chain has beenfocused as a templet to assess the biomobility of heavymetals in soil-higher plant-insect hierarchy. Both in thecase of Cd and Cu treatments, higher mobility wasobserved in the level-1 (soil–root) followed by level-3(leaf–larva), level-4 (larvae–faecal) and level-2(root–leaf). Consequently, roots accumulated more amountsof Cd and Cu, with a limited transport to the leaves.Among the two metals (Cd and Cu) tested, in the plant,the transfer potential of Cd exceeds that of Cu. Whereasin the case of leaf–larval transfer, Cu precedes overCd. Accumulation of Cd and Cu in all the levels (1–4)tested showed a concentration dependent increase, except inthe level 4 (larva–faecal) of Cd treatment where adeclining trend was noticed. 相似文献
35.
36.
37.
小型废电池填埋焚烧处置的健康风险分析 总被引:3,自引:0,他引:3
对废电池采取填埋、焚烧处置所引起的健康风险进行了分析,采用3种模型,分别研究了废电池随城市固体废物一起完全填埋处置,一起完全焚烧处置,一起部分填埋处置和部分焚烧处理时,可能引起的健康风险,由分析可知,镉镍电池焚烧过程将引起不可接受的致癌风险,填埋废电池也会引起重金属非致癌风险,提出在现阶段没有单独收集分类管理的条件下,对于小型废电池应采取填埋焚烧联合处置的办法,但应避免镉镍电池的焚烧,在建立了收集体系后,应该分类进行资源化和无害化管理。 相似文献
38.
国际海事组织目前正在对《MARPOL73/78公约》附则Ⅱ-控制散装液体有毒物质污染规则作重大修改,内容包手胡毒液体物质和化学品,这很可能对主管机关、船公司和化工界造成严重的冲击。 相似文献
39.
The landfill of municipal solid waste(MSW) could be regarded as denitrification reactor and involved in ammonia nitrogen biological removal process. In this research, the process was applied to municipal solid waste collected in Shanghai, China, which was characterized by high food waste content. The NH4^ removal efficiency in the system of SBR nitrifying reactor followed by fresh and matured landfilled waste layer in series was studied. In the nitrifying reactor, above 90% of NH4^ in leachate was oxidized to NO2^- and NO3^- . Then high concentrated NO2^- and NO3^- were removed in the way of denitrification process in fresh landfilled waste layer. At the same time, degradation of fresh landfilled waste was accelerated. Up to the day 120, 136.5 gC/(kg dry waste) and 17.9 gN/(kg dry waste) were converted from waste layer. It accounted for 50.15 % and 86.89 % of the total carbon and nitrogen content of preliminary fresh waste, which was 4.42 times and 5.17 times higher than that of reference column respectively. After filtering through matured landfilled waste, BOD5 concentration in leachate dropped to below 100 mg/L, which would not affect following nitrification adversely. Because the matured landfilled waste acted as a well methanogenic reactor, 23% of carbon produced accumulatively from fresh landfilled waste degradation was converted into CH4. 相似文献
40.