全文获取类型
收费全文 | 1255篇 |
免费 | 175篇 |
国内免费 | 438篇 |
专业分类
安全科学 | 88篇 |
废物处理 | 75篇 |
环保管理 | 188篇 |
综合类 | 998篇 |
基础理论 | 139篇 |
污染及防治 | 169篇 |
评价与监测 | 119篇 |
社会与环境 | 46篇 |
灾害及防治 | 46篇 |
出版年
2024年 | 6篇 |
2023年 | 21篇 |
2022年 | 29篇 |
2021年 | 48篇 |
2020年 | 46篇 |
2019年 | 48篇 |
2018年 | 61篇 |
2017年 | 64篇 |
2016年 | 56篇 |
2015年 | 64篇 |
2014年 | 78篇 |
2013年 | 108篇 |
2012年 | 108篇 |
2011年 | 94篇 |
2010年 | 91篇 |
2009年 | 101篇 |
2008年 | 64篇 |
2007年 | 98篇 |
2006年 | 95篇 |
2005年 | 59篇 |
2004年 | 83篇 |
2003年 | 73篇 |
2002年 | 60篇 |
2001年 | 40篇 |
2000年 | 52篇 |
1999年 | 35篇 |
1998年 | 38篇 |
1997年 | 32篇 |
1996年 | 20篇 |
1995年 | 23篇 |
1994年 | 10篇 |
1993年 | 15篇 |
1992年 | 15篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 8篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有1868条查询结果,搜索用时 375 毫秒
141.
超临界水氧化法处理有机污染物 总被引:13,自引:1,他引:13
介绍了超临界水氧化法处理有机污染物的基本原理,工艺流程和应用实例及使用范围,对比分析了超临界水氧化法与焚烧法处理有机污染物的技术特点,经济实用性,指明了超临界水氧化法作为一种有效的有机污染物处理方法,在化工环保等领域将具有广阔的应用前景。 相似文献
142.
解读《建设项目环境保护管理条例》修订的要点,剖析当前石油化工建设项目环境保护管理体系的核心由“环评制度”逐步向“排污许可证制度”转变的现实情况,及与此相应的环保行政主管部门对建设单位和设计咨询单位的环保工作提出的新要求。从实际工作出发,总结了中国石化系统和民营企业石油化工建设项目在新形势下环保管理工作的特点、遇到的问题及解决方案。 相似文献
143.
着重论述了株洲化工集团有限责任公司废水污染物排放总量控制指标的确定方法,并简述了排放总量控制对策。 相似文献
144.
Siman RR Borges AC Ratusznei SM Rodrigues JA Zaiat M Foresti E Borzani W 《Journal of environmental management》2004,72(4):1324-247
The effect of organic loading on the performance of a mechanically stirred anaerobic sequencing biofilm batch reactor (ASBBR) has been investigated, by varying influent concentration and cycle period. For microbial immobilization 1-cm polyurethane foam cubes were used. An agitation rate of 500 rpm and temperature of 30+/-2 degrees C were employed. Organic loading rates (OLR) of 1.5-6.0gCODl(-1)d(-1) were applied to the 6.3-l reactor treating 2.0 l synthetic wastewater in 8 and 12-h batches and at concentrations of 500-2000mgCODl(-1), making it possible to analyze the effect of these two operation variables for the same organic loading range. Microbial immobilization on inert support maintained approximately 60 gTVS in the reactor. Filtered sample organic COD removal efficiencies ranged from 73 to 88% for organic loading up to 5.4gCODl(-1)d(-1). For higher organic loading (influent concentration of 2000mgCODl(-1) and 8-h cycle) the system presented total volatile acids accumulation, which reduced organics removal efficiency down to 55%. In this way, ASBBR with immobilized biomass was shown to be efficient for organic removal at organic loading rates of up to 5.4gCODl(-1)d(-1) and to be more stable to organic loading variations for 12-h cycles. This reactor might be an alternative to intermittent systems as it possesses greater operational flexibility. It might also be an alternative to batch systems suspended with microorganisms since it eliminates both the uncertainties regarding granulation and the time necessary for biomass sedimentation, hence reducing the total cycle period. 相似文献
145.
根据加卸载响应比理论,通过对1991~1996年江苏省部分井孔观测资料固体潮加卸载响应比的计算发现,在中强地震前一年左右的时间震中区附近的井孔出现了响应比高值异常。通过空间图像扫描可以看出:在苍山地震前一年左右,徐州、宿迁地区出现了加卸载响应比的高值集中区;在南黄海地震前一年左右,在镇江、苏州地区出现了高值集中区,之后高值集中区有自西向东迁移即有向震中区迁移的迹象。 相似文献
146.
147.
E. B. Welch J. P. Michaud M. A. Perkins 《Journal of the American Water Resources Association》1982,18(6):929-936
ABSTRACT: Alum treatment of a shallow lake, with mean depth 2 m and area 137 ha, curtailed internal loading of P for at least one ear. Mean summer total P and chl a decreased from 76 and 27μg l?1, respectively, in 1978 before treatment. to 29 and 14 μ l?1, while mean summer Sed transparency increased from 1.6 to 2.2 m and blue green algae were no longer dominant. Macrophyte biomass and distribution retuned during the post-alum year, 1980-1981, to previous levels after a 1979 four-month lake level drawdown had reduced biomass by 84 percent The improved transparency, resulting from the decrease in chl a following treatment, could encourage greater biomass of macrophytes in the deeper area of the lake. Recovery of macrophyte biomass to predrawdown levels may restore internal loading of P through enrichment of deep water sediments during winter dieback and decomposition. 相似文献
148.
Ashok N. Shahane 《Journal of the American Water Resources Association》1982,18(2):231-237
ABSTRACT: A simple procedure for estimating pre- and post-development water quality loadings from residential communities is discussed. The procedure deals with: (a) gathering basic water quality loading numbers observed by others at several watersheds with various land uses; (b) obtaining the breakdown of proposed land uses at various phases of the community development; and (c) estimating pre- and post-development water quality loading numbers by taking the weighted average of the basic loading numbers in terms of areal coverages of different land uses at various phases of development. Results of this simplified procedure have been verified indirectly by comparing them with the estimates derived independently through a more fundamental but time-consuming approach. The procedure was used to evaluate the anticipated water quality impact of two future residential communities in South Florida by analyzing four water quality parameters: Suspended Soils (SS), Total Nitrogen (TN), Total Phosphorus (TP), and Biochemical Oxygen Demand (BOD5). Although computation of loading numbers with mixed land uses is not an exact science at the present time, the recommended approach appears to be the best available technique to analyze quantitatively the water quality-quantity-land use interactions. 相似文献
149.
企业环境监测工作有其自身特点,本文从监测对象、监测项目、监测职能、监测手段、监测信息处理等方面论述了强化企业环境监测的途径和方法。 相似文献
150.
通过隧道排污量和排污效果的简单分析,指出了其排污治理过程中应注意的有关事项,如进 行人口控制,改善居民的生活方式,提高环境保护意识和治理技术等,所述分析方法可供其它类似 工程参考。 相似文献