全文获取类型
收费全文 | 4812篇 |
免费 | 201篇 |
国内免费 | 1681篇 |
专业分类
安全科学 | 326篇 |
废物处理 | 293篇 |
环保管理 | 354篇 |
综合类 | 2480篇 |
基础理论 | 812篇 |
污染及防治 | 1855篇 |
评价与监测 | 177篇 |
社会与环境 | 187篇 |
灾害及防治 | 210篇 |
出版年
2024年 | 1篇 |
2023年 | 81篇 |
2022年 | 237篇 |
2021年 | 177篇 |
2020年 | 128篇 |
2019年 | 129篇 |
2018年 | 187篇 |
2017年 | 217篇 |
2016年 | 234篇 |
2015年 | 261篇 |
2014年 | 378篇 |
2013年 | 508篇 |
2012年 | 388篇 |
2011年 | 447篇 |
2010年 | 322篇 |
2009年 | 292篇 |
2008年 | 305篇 |
2007年 | 256篇 |
2006年 | 264篇 |
2005年 | 190篇 |
2004年 | 153篇 |
2003年 | 157篇 |
2002年 | 165篇 |
2001年 | 152篇 |
2000年 | 161篇 |
1999年 | 144篇 |
1998年 | 153篇 |
1997年 | 116篇 |
1996年 | 107篇 |
1995年 | 81篇 |
1994年 | 65篇 |
1993年 | 58篇 |
1992年 | 54篇 |
1991年 | 26篇 |
1990年 | 35篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 12篇 |
1986年 | 9篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 6篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有6694条查询结果,搜索用时 109 毫秒
991.
我国削减并逐步替代全氟辛烷磺酸盐(PFOS)的策略与建议 总被引:1,自引:0,他引:1
全氟辛烷磺酸盐(PFOS)具有低表面张力、良好的热稳定性和化学稳定性等特性,作为含氟表面活性剂被广泛应用于卫生、消防与电镀等工业领域。但是,PFOS具有高持久稳定性,会在环境、人体与动物组织中富集,因此2009年《斯德哥尔摩公约》将PFOS列为新增POPs受控物质。目前,我国还在生产和使用PFOS,如何对其进行有效控制,削减并逐渐替代PFOS及其衍生物,是我国面临的巨大挑战。在介绍了PFOS的生产与应用现状基础上,结合其替代技术,提出了削减和逐步替代PFOS的策略。 相似文献
992.
手性氟虫腈对意大利蜜蜂和稻螟赤眼蜂的急性毒性及安全评价 总被引:1,自引:0,他引:1
手性农药多以外消旋体形式用于农业生产和卫生害虫防治中。但手性农药对映体通常具有不同的生物活性和毒性,这种现象在农药环境风险评价过程中往往被忽视。本研究以氟虫腈为例,首先用高效液相色谱-手性固定相(HPLC-CSP)技术拆分出氟虫腈的S型和R型2种对映体,分别采用点滴法和药膜法测定了氟虫腈对映体及外消旋体对意大利蜜蜂(Apis mellifera L.)和稻螟赤眼蜂(Trichogramma japonicum Ashmead)的急性毒性。结果显示,S(+)-氟虫腈、R(-)-氟虫腈和外消旋体对意大利蜜蜂的48h-LD50分别为0.00341、0.00396和0.00383μg·蜂-1,对稻螟赤眼蜂的24h-LR50分别为7.56×10-7、8.06×10-7和7.29×10-7mg·cm-2。研究表明,氟虫腈对意大利蜜蜂具有高毒性风险,对稻螟赤眼蜂有极高毒性风险,且氟虫腈对意大利蜜蜂和稻螟赤眼蜂的急性毒性无明显的对映体选择性。因此,使用氟虫腈单一对映体不会降低其对环境生物的毒害风险。 相似文献
993.
994.
臭氧-活性炭技术处理炼化企业RO浓水 总被引:3,自引:1,他引:2
采用臭氧-活性炭技术对炼化企业RO浓水进行实验研究。通过研究该废水在不同pH、臭氧投加量、臭氧接触时间、投加催化剂、活性碳吸附时间和活性碳投加量条件下RO浓水中COD的去除效果,确定臭氧-活性炭工艺处理炼化企业RO浓水的工艺参数。结果表明:在pH为8,臭氧投加量为75 mg/L,臭氧接触时间为5 min,催化剂KMnO4的投加量为35 mg,活性炭吸附时间为150 min,活性炭投加量为4 g/L时,臭氧-活性炭技术对RO浓水中COD处理效果达到最佳,总去除率为58%。 相似文献
995.
针对厌氧发酵液回流可提高厌氧系统性能,而不适的回流比例又会造成系统酸化的现象,采用单相连续反应器研究了发酵液回流及不同回流比对餐厨垃圾厌氧消化过程的影响。结果表明:在1 gVS/L的有机负荷下进行三种比例(10%、30%、50%)的发酵液回流使系统日平均产气量比不回流阶段分别提高0.7%、13.0%、4.9%,且对气体甲烷含量无显著影响。回流使VFA降解更充分,也使系统缓冲能力得到调节,但在较高的回流比(50%)下会造成Na+积累从而抑制系统产气性能。 相似文献
996.
997.
998.
Ruiqiang?YangEmail author Ting?Xie Handong?Yang Simon?Turner Guangjian?Wu 《Environmental geochemistry and health》2018,40(1):303-312
Sediment cores from four lakes across the Tibetan Plateau were used as natural archives to study the time trends of organochlorine pesticides (OCPs). The total concentrations of dichlorodiphenyltrichloroethane (ΣDDT) and hexachlorocyclohexane isomers (ΣHCH) were in the range of 0.04–1.61 and 0.08–1.88 ng/g based on dry weight (dw), while the input fluxes were in the range of 0.3–236 and 0.7–295 pg/cm2/y in the core sediments, respectively. The input fluxes of ΣDDT and ΣHCH generally peaked in sediment layers corresponding to the 1970s–1990s and peaked in top sediment layers. The ratio of α/γ-HCH decreased in the top layer sediments, implying that the contribution of lindane (pure γ-HCH) has been increasing in recent years. In addition, the ratio of o,p′-DDT/p,p′-DDT increased significantly over the last 15–20 years, suggesting that dicofol (characterized by high ratio of o,p′-DDT/p,p′-DDT about 7.0) has recently become a relatively more important source of DDT compared to technical DDT itself. The time trends of OCPs recorded in lake sediments examined the impact on such remote alpine regions by human activities. 相似文献
999.
A detailed nitrogen (N) budget has been developed for an urban ecosystem based on the method of material flow analysis. How increased human activity and urbanisation influences N cycling have also been analysed. Total N input and output in the urban ecosystem of Zhengzhou City (ZUE) was calculated at 304.8?Gg was 275.3?Gg year?1, resulting in an N accumulation of 29.5?Gg year?1. Industry and human life activities, which respectively accounted for 43.8% and 34.2% of total N inputs and 52.6% and 29.1% of total N outputs, were the core of N flow in the urban ecosystem. Humans activities mediated more than 98% N inputs into the ZUE, 73.2% of N was released into the atmosphere and 11.7% into hydrosphere. This very large volume of released N could contribute to regional problems. High energy consumption, insufficient wastewater treatment facility practices, and low N use efficiency are the primary causes of pollution. The major challenge ahead for the urban ecosystem is how to manage high-intensity N pollutant inputs to the urban ecosystems coupled with incomplete N cycling and removal. Based on the analysis of the N budget and loading, this study also proposes an N management strategy for the ZUE. 相似文献
1000.
Tang H.Yao Y.Zhang G.Li X.Ding H.Wu Y.Gao Y. 《应用与环境生物学报》2018,(2):335-341
BRI1-ASSOCIATED RECEPTORKINASE1(BAK1), a leucine-rich repeat (LRR) receptor protein kinase, plays a significant role in brassinosteroid (BR) signaling. Furthermore, it combines with other LRR-RLKs protein to initiate immune response in plants. The objective of this study was to (1) investigate the function of the Populus euphratica BAK1;1 gene in the resistance of transgenic tobacco to Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) and (2) discuss the regulation pathway of PeBAK1;1 involved in the resistance to plant pathogen. We cloned the cDNA sequence of the P. euphratica PeBAK1;1 gene, constructed the pBI121-35S::PeBAK1;1 over-expression vector, and then transformed it into wild-type tobacco by Agrobacterium-mediated transformation to obtain PeBA K 1;1-overexpressing transgenic tobacco plants. The bioinformatic analysis showed that the PeBAK1;1 protein contained all the structural features of the plant SERK family. The phylogenetic tree showed that PeBAK1;1 has the highest sequence homology with PtBAK1. The gene expression profile results indicated that the expression of PeBAK1;1 in the root was higher than that in the leaf and stem. The wild-type tobacco plants showed an obvious susceptibility to Pst DC3000, whereas the transgenic plants exhibited enhanced resistance to Pst DC3000. Compared with that of the wild-type (WT), the real-time PCR and quantitative real-time PCR analysis revealed that the expression of pathogenesis-related genes (including PR1, PR3, PR4, and PR5), BAK1-interacting receptor kinase 1 gene, and BONZAI1 gene was upregulated in 35S::PeBAK1;1 transgenic tobacco plants. In conclusion, the PeBAK1;1 gene plays a positive regulatory role in 35S::PeBAK1;1 transgenic tobacco against Pst DC3000, which can enhance the resistance of plants to pathogen. © 2018 Science Press. All rights reserved. 相似文献