全文获取类型
收费全文 | 2527篇 |
免费 | 89篇 |
国内免费 | 712篇 |
专业分类
安全科学 | 146篇 |
废物处理 | 167篇 |
环保管理 | 196篇 |
综合类 | 1125篇 |
基础理论 | 438篇 |
环境理论 | 1篇 |
污染及防治 | 976篇 |
评价与监测 | 112篇 |
社会与环境 | 56篇 |
灾害及防治 | 111篇 |
出版年
2023年 | 35篇 |
2022年 | 108篇 |
2021年 | 105篇 |
2020年 | 62篇 |
2019年 | 69篇 |
2018年 | 74篇 |
2017年 | 111篇 |
2016年 | 133篇 |
2015年 | 123篇 |
2014年 | 212篇 |
2013年 | 255篇 |
2012年 | 227篇 |
2011年 | 234篇 |
2010年 | 173篇 |
2009年 | 165篇 |
2008年 | 167篇 |
2007年 | 145篇 |
2006年 | 148篇 |
2005年 | 100篇 |
2004年 | 70篇 |
2003年 | 83篇 |
2002年 | 70篇 |
2001年 | 51篇 |
2000年 | 49篇 |
1999年 | 57篇 |
1998年 | 50篇 |
1997年 | 52篇 |
1996年 | 31篇 |
1995年 | 33篇 |
1994年 | 27篇 |
1993年 | 19篇 |
1992年 | 23篇 |
1991年 | 12篇 |
1990年 | 18篇 |
1989年 | 13篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有3328条查询结果,搜索用时 283 毫秒
991.
Guangshui Na Wei Wei Shiyao Zhou Hui Gao Xindong Ma Lina Qiu Linke Ge Chenguang Bao Ziwei Yao 《环境科学学报(英文版)》2015,(2):8-13
In recent years, Dechloranes have been widely detected in the environment around the world.However, understanding and knowledge of Dechloranes in remote regions, such as the Arctic,remain lacking. Therefore, the concentrations of 5 Dechloranes in surface seawater, sediment,soil, moss, and dung collected from Ny-lesund in the Arctic were measured with the concentrations 93 pg/L, 342, 325, 1.4, and 258 pg/g, respectively, which were much lower than those in Asian and European regions. The mean ratios of anti-Dechlorane Plus(DP) to total DP(fanti) in seawater, sediment, soil, moss, dung, and atmospheric samples were 0.36, 0.21, 0.18,0.27, 0.66, and 0.43, respectively. Results suggested that the main source of DP in seawater,sediment, soil, and moss was long-range atmospheric transport. However, the ratio identified in dung was different, for which the migration behavior of the organism is probably the main source of DP. 相似文献
992.
从冬季时污水处理厂曝气池的活性污泥中分离出高生物活性的耐冷细菌和耐冷酵母菌,以低温生活污水为处理对象,分别测定单株菌及混合耐冷菌群有机污染物降解能力.结果表明,共分离出从属于黄杆菌属、假单胞菌属、芽胞杆菌属等的耐冷细菌6株;从属于毕赤酵母菌属、假丝酵母菌属、红酵母菌属等的耐冷酵母菌4株.耐冷菌在5℃条件下具有相对较短的世代时间:9.04~13.11 h.单株耐冷细菌F和耐冷酵母菌AH在5℃条件下的COD去除率分别为64%和83%.混合耐冷菌群经驯化后可较高地去除低温生活污水中的有机污染物,COD去除率可保持在83%~87%. 相似文献
993.
994.
995.
Sas-Nowosielska A Galimska-Stypa R Kucharski R Zielonka U Małkowski E Gray L 《Environmental monitoring and assessment》2008,137(1-3):101-109
Phytoremediation, an approach that uses plants to remediate contaminated soil through degradation, stabilization or accumulation,
may provide an efficient solution to some mercury contamination problems. This paper presents growth chamber experiments that
tested the ability of plant species to stabilize mercury in soil. Several indigenous herbaceous species and Salix viminalis were grown in soil collected from a mercury-contaminated site in southern Poland. The uptake and distribution of mercury
by these plants were investigated, and the growth and vitality of the plants through a part of one vegetative cycle were assessed.
The highest concentrations of mercury were found at the roots, but translocation to the aerial part also occurred. Most of
the plant species tested displayed good growth on mercury contaminated soil and sustained a rich microbial population in the
rhizosphere. The microbial populations of root-free soil and rhizosphere soil from all species were also examined. An inverse
correlation between the number of sulfur amino acid decomposing bacteria and root mercury content was observed. These results
indicate the potential for using some species of plants to treat mercury contaminated soil through stabilization rather than
extraction. The present investigation proposes a practical cost-effective temporary solution for phytostabilization of soil
with moderate mercury contamination as well as the basis for plant selection. 相似文献
996.
常温下IC反应器启动过程中的颗粒污泥性能研究 总被引:6,自引:1,他引:5
在常温下用自配葡萄糖废水启动IC反应器,研究了厌氧颗粒污泥的形成过程和特性。IC反应器进水浓度为3 000 mg COD/L,水温为14.5~26℃,25 d内形成了颗粒污泥。结果表明,随着运行时间和容积负荷的增加,颗粒污泥粒径逐渐增大。反应器启动完成后,反应器中2 mm的颗粒污泥增加到6.6%,0.3 mm的颗粒从57.7%减少到39.4%;VSS浓度从24.7 g/L上升到48.2 g/L;VSS/SS从34.4%增加到72.8%。颗粒污泥的沉降速度与颗粒粒径成正比,0.3~3 mm的颗粒污泥的沉降速度介于34.05~109.75 m/h之间,具有良好的沉降性能。初始接种污泥几乎没有产甲烷活性,与第30 d的初期颗粒污泥相比,成熟的颗粒污泥的产甲烷活性提高了46.7%。 相似文献
997.
沈阳商业城火灾及灾后修复 总被引:1,自引:0,他引:1
介绍了发生在沈阳商业城的火灾及灾后调查、检测和加固情况,从中得到一些有意义的看法。 相似文献
998.
ABSTRACT: Stable isotopes of deuterium and oxygen-18 of surface and ground water, together with anion concentrations and hydraulic gradients, were used to interpret mixing and flow in ground water impacted by artificial recharge. The surface water fraction (SWF), the percentage of surface water in the aquifer impacted via recharge, was estimated at different locations and depths using measured deuterium/hydrogen (DIH) ratios during the 1992, 1993, and 1994 recharge seasons. Recharged surface water completely displaced the ground water beneath the recharge basins from the regional water table at 7.60 m to 12.16 m below the land surface. Mixing occurred beneath the recharge structures in the lower portions of the aquifer (>12.16 m). Approximately 12 m down-gradient from the recharge basin, the deeper zone (19.15 m depth) of the primary aquifer was displaced completely by recharged surface water within 193, 45, and 55 days in 1992, 1993, and 1994, respectively. At the end of the third recharge season, recharged surface water represented ~50 percent of the water in the deeper zone of the primary aquifer ~1000 m downgradient from the recharge basin. A classic asymmetrical distribution of recharged surface water resulted from the recharge induced horizontal and vertical hydraulic gradients. The distribution and breakthrough times of recharged surface water obtained with stable isotopes concurred with those of major anions and bromide in a tracer test conducted during the 1995 recharge season. This stable isotope procedure effectively quantified mixing between surface and ground water. 相似文献
999.
Entangling the Complexity of Protected Area Management: The Case of Wolong Biosphere Reserve,Southwestern China 总被引:6,自引:1,他引:5
Protected Area (PA) management is a complex issue that requires the consideration of many factors and relationships. A conceptual framework for the analysis of biodiversity change, local human communities, and PA management was put forward, accordingly. Under the framework, we investigated the economic status, livelihood activities, biodiversity use and perceptions of local communities, and the land use history in Wolong Biosphere Reserve, southwestern China through household survey and document review in order to gain a better understanding of the complexity of PA management. According to the land use history, the preservation of agro-biodiversity, and the raising of productivity, ecological rehabilitation and the regulation of the human pressures are indispensable in the management of the reserve. Livelihood activities and the perceptions of local communities were largely determined by the socioeconomic background, which has important implications in solving the conflicts or incompatibilities in the reserve. In Wolong Biosphere Reserve, it is beneficial to support local farmers in solving their socioeconomic problems such as the overabundance of labor force and the lack of livelihood alternatives. Without this, there will be scarcely any effective biodiversity conservation and successful reserve management in the long term. 相似文献
1000.
沿空窄煤柱锚网带支护的巷道稳定性研究 总被引:1,自引:1,他引:0
锚杆支护是煤矿采准巷道的重要支护方式 ,沿空留巷技术是回采巷道支护技术改革的主要方面。笔者将两种技术相结合 ,用于保证回采巷道的稳定。在现场矿压观测的基础上 ,讨论了支承压力分布规律和窄煤柱护巷机理 ,运用极限平衡理论计算出护巷煤柱宽度 ,同时结合数值分析和现场巷道变形以观测结果 ,实践证明 ,只要设计参数合理 ,施工质量满足要求 ,沿空窄煤柱锚网带支护技术就可以保证回采巷道的稳定 相似文献