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961.
Particle-associated polycyclic aromatic hydrocarbon (PAH) concentrations were investigated at eight sampling sites during cold periods where heating is used (heating period) (February to March, 2005) and warm periods where heating is not required (non-heating periods) (August to September 2006) in the urban area of Anshan, an iron and steel city in northeastern China. Eleven PAH species were measured using GC-MS. The total average concentrations of PAHs ranged from 46.14 to 385.60 ng m(-3) in the heating period and from 5.28 to 146.40 ng m(-3) in the non-heating period. The lowest concentration of ∑PAHs was observed at Qianshan, a monitoring site far from the city and industrial area, and the highest concentration occurred in the site located at the factory area of Anshan Iron and Steel Incorporation. Moreover, ambient PAH profiles were studied and high molecular weight PAH (including 4-6 rings) species occurred in the high fractions. Toxic equivalent factors analysis gave the potential carcinogenic risks in Anshan. For the heating sampling period, BaP equivalent concentration is in the range of 41.98 to 220.83 ng m(-3), and 9.23 to 126.00 ng m(-3) for the non-heating sampling period. By diagnostic ratio analysis, traffic emission and combustion (coal or biomass) were potential sources for PAHs in Anshan. Finally, PCA results indicated the major sources were vehicle emission, steel industry emission, and coal combustion for both heating and non-heating seasons, which agreed with the results from the diagnostic ratio analysis. 相似文献
962.
Tracing sources of coal combustion using stable sulfur isotope ratios in epilithic mosses and coals from China 总被引:1,自引:0,他引:1
Xiao HY Tang CG Zhu RG Wang YL Xiao HW Liu CQ 《Journal of environmental monitoring : JEM》2011,13(8):2243-2249
In China, coal combustion is the most important source of atmospheric sulfur pollution. Moss sulfur isotopic signatures have been believed to hold source-specific information that can serve as a fingerprint to identify atmospheric sulfur sources. In cities where only local coals were combusted, we observed a good correspondence of average sulfur isotope ratios in urban mosses (Haplocladium microphyllum) to the values of local coals (δ(coals) = 1.455δ(mosses)- 3.945, R(2) = 0.975, p = 0.01). But if different types of coals were combusted, we did not know whether moss sulfur isotope ratios can indicate mixed coals. To confirm this, using a mixing model we estimated the ratios of imported coal to local coals at cities where both coals were used. We found that the estimated ratios at large cities (>1 million people) where both coals were used were similar to the reported ratios in their respective provinces. For small cities (<0.5 million people) in Jiangxi Province and other provinces, the estimated ratios were higher than the reported ratios because the relatively cheaper local coals were less used in all the small cities except in cities where local coal deposits were found nearby. The comparison results showed that moss sulfur isotope is a useful tool for indicating coal-derived sulfur even in cities where mixed coals were combusted. 相似文献
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GIS技术在土地资源估价中的应用分析 总被引:1,自引:0,他引:1
本文主要分析了GIS技术的功能、概念、发展及基于该技术的土地估价信息系统的组成、功能和优越性。为土地估价提供了强有力的技术支持和科学依据 相似文献
967.
IntroductionHealthhazardsfrommercuryintheenvironmenthavecausedrestrictionsintheuseofmercuryandastrictercontrolofthereleaseofmercuryfromindustrialandotheruses.Butatthesametimethesesourcesofmercuryhavebeensubjectedtoregulation ,twonewsourceshaveappeared … 相似文献
968.
对地质矿产部门1991年初至1992年底开展的工业卫生普查工作资料进行分析,简述了职业危害人群分布、现场监测、职业病的现状及危害原因,提出了防护措施和改进意见。 相似文献
969.
区际生态补偿机制是区域间协调发展的关键 总被引:41,自引:0,他引:41
环境问题和环境资源关系已成为重要的区际社会关系和社会矛盾,极大的影响和抑制区域协调发展,首先探讨区际环境问题和环境关系的成因、类型、数量动态、时空演变格局;独创性的剖析区际环境关系、区际环境问题难以解决的深刻根原。深入研究区际生态补偿作用和影响,指明缺乏补偿是江河上游与下游地区间矛盾产生的重要原因,也是环境问题难以解决的重要原因。指出区际生态补偿体系应由政策法律制订机构、补偿计算机构、补偿征收管理机构等组成;同时着重研究计算策略思路、计算方法、计算过程、计算结果表达等生态补偿计算有关问题;分析建立区际生态补偿机制在环境资源管理体制、绿色国民经济核算体系(转移支付制度)、环境影响数量技术、环境问题争端协调等面临的诸多困难。 相似文献
970.
SBR法处理城市生活污水的研究 总被引:12,自引:0,他引:12
介绍了SBR法处理城市生活污水的小试。结果表明:SBR法能获取较好的出水水质。总BOD、溶解性BOD、总COD、溶解性COD、氨氮和悬浮物去除率分别为94.4/~96.6%,92.6%~96.2%,84.1%~87.3%,61%~69%,78.1%~84.3%和91.9%~95.1%。为了适应农业灌溉的需要,还应采取深层石英砂过滤进一步降低浊度。 相似文献