全文获取类型
收费全文 | 6359篇 |
免费 | 817篇 |
国内免费 | 2048篇 |
专业分类
安全科学 | 1005篇 |
废物处理 | 186篇 |
环保管理 | 598篇 |
综合类 | 4618篇 |
基础理论 | 912篇 |
污染及防治 | 752篇 |
评价与监测 | 423篇 |
社会与环境 | 402篇 |
灾害及防治 | 328篇 |
出版年
2024年 | 51篇 |
2023年 | 132篇 |
2022年 | 378篇 |
2021年 | 335篇 |
2020年 | 442篇 |
2019年 | 300篇 |
2018年 | 296篇 |
2017年 | 343篇 |
2016年 | 316篇 |
2015年 | 388篇 |
2014年 | 418篇 |
2013年 | 542篇 |
2012年 | 566篇 |
2011年 | 615篇 |
2010年 | 556篇 |
2009年 | 532篇 |
2008年 | 488篇 |
2007年 | 535篇 |
2006年 | 448篇 |
2005年 | 331篇 |
2004年 | 250篇 |
2003年 | 172篇 |
2002年 | 179篇 |
2001年 | 167篇 |
2000年 | 134篇 |
1999年 | 72篇 |
1998年 | 49篇 |
1997年 | 39篇 |
1996年 | 40篇 |
1995年 | 31篇 |
1994年 | 25篇 |
1993年 | 19篇 |
1992年 | 19篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有9224条查询结果,搜索用时 453 毫秒
911.
农场供水是一种特殊给水,供水管道中的“结垢”现象是处理的难题,本文在调查分析的基础上,比较几种处理方法,提出药剂软化法,并施以相应的工程,使其达标排放。 相似文献
912.
913.
海岸带是一个在地理意义上和社会经济意义上独具特征的区域。这种条带状的区域,包含着巨大的环境价值和经济价值,因而受到沿海国家的重视,并已形成一种“海岸带”的社会意识。随着生产和科学技术的发展,海岸带的研究领域愈来愈广阔,自然资源综合研究与日俱增。近年来,美国海岸带的研究,在环境、社会经济和海岸工程的基础上,特别强调资源、生态系统、计划和管理法规等方面,出版了有关海岸带技术、环境、社会 相似文献
914.
生命周期评价在工程分析中的运用 总被引:2,自引:0,他引:2
工程分析是建设项目环境影响评价的关键所在。就目前工程分析存在的问题进行讨论,介绍生命周期评价的基本过程,提出将生命周期评价引入工程分析,以提高工程分析的科学性,为项目决策提供科学依据。‘’ 相似文献
915.
916.
917.
颗粒活性炭对UASB处理垃圾渗滤液促进作用的研究 总被引:1,自引:0,他引:1
通过对比研究,考查了用UASB处理垃圾渗滤液时,投加颗粒活性炭对加速UASB反应器中污泥颗粒化进程、缩短启动时间、提高处理效果的影响。结果显示:启动时间缩短了近1/3,最大有机负荷提高近40%且出现了更大颗粒污泥,但COD去除效率没有明显提高。 相似文献
918.
剩余污泥的处理与处置是个世界性的难题。目前的处置方法中,土地利用逐渐被各国所广泛采用。通过对秦皇岛第三、第四污水处理厂的剩余污泥的基本性质进行测试,以此为基础对污泥的农用价值及其应用前景进行分析和展望。 相似文献
919.
Effects of four chlorobenzenes on serum sex steroids and hepatic microsome enzyme activities in crucian carp, Carassius auratus 总被引:1,自引:0,他引:1
Four chlorobenzenes (chlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, p-chloro-methylbenzene) were administrated to the crucian carps (Carassius auratus) by peritoneal injections in the laboratory for 30 days. Serum testosterone and 17 beta-estradiol concentrations were detected using radioimmunology assay (RIA), and the activities of two hepatic microsome enzymes, glutathione s-transferase (GST) and UDP-glucuronosyltransferase (UDPGT), were measured using the modified methods as described by Habig and Owens. Results showed that the four chlorobenzenes caused significant increases in serum testosterone concentration in the crucian carps (P < 0.05) compared to the controls, but they caused no significant effect on 17 beta-estradiol level. All test chemicals caused a change in hepatic GST activity in crucian carps, with significant increases in enzyme activity (P < 0.05). Chlorobenzene, 1,3-dichlorobenzene and p-chloro-methylbenzene resulted in a marked inhibition to UDPGT activity in crucian carp (P < 0.05) except 1,4-dichlorobenzene. The changes in hepatic microsome enzyme activities may have resulted in the alterations of serum sex steroids levels in the crucian carps. The results indicated that these four chlorobenzenes may result in the changes of endocrine functions and may affect the reproductive success of this and other species. 相似文献
920.
Effect of citric, malic, tartaric and acetic acids on adsorption of La, Ce, Pr and Nd by and desorption from four typical Chinese soils was studied. Generally, adsorption capacities of rare earth elements (REEs) were significantly correlated with the cation exchange capacity (CEC) of soils. In the presence of acetic acids adsorption of REEs was similar to that in the presence of Ca(NO3)2. However, in the presence of citric, malic and tartaric acids adsorption of REEs by Heilongjiang, Zhejiang and Guangdong soils decreased to varying extents if compared with that in the presence of nitrate and acetic acid. The significance of suppression followed the order of citric acid > malic acid > tartaric acid > acetic acid, which was consistent with the order of stability of complexes of REEs with these organic acids. However, the adsorption increased with increasing equilibrium solution pH. For Jiangxi soil with low soil pH, CEC and organic matter these organic acids exerted an even more serious suppression effect on the adsorption of REEs. Another feature of the relationship between the adsorption of REEs and equilibrium solution pH was that the adsorption of REEs decreased with increase of pH from 2 to 4.5 and then slightly increased with further increase of pH. Desorption of REEs varied with soils and with organic acids as well. REEs were released easily from Heilongjiang, Zhejiang and Guangdong soils in the presence of organic acid. Generally, desorption of REEs decreased with increasing equilibrium solution pH. Effect of organic acids on desorption of REEs from Jiangxi soil was more complicated. In the presence of citric and malic acids no decrement and/or slight increase in desorption of REEs were observed over the equilibrium solution pH from 3 to 6.5. The reasons for this were ascribed to the strong complexing capacity of citric and malic acids and low soil pH, CEC and organic matter of Jiangxi soil. 相似文献