全文获取类型
收费全文 | 5900篇 |
免费 | 48篇 |
国内免费 | 68篇 |
专业分类
安全科学 | 186篇 |
废物处理 | 319篇 |
环保管理 | 575篇 |
综合类 | 872篇 |
基础理论 | 1158篇 |
环境理论 | 5篇 |
污染及防治 | 1927篇 |
评价与监测 | 548篇 |
社会与环境 | 388篇 |
灾害及防治 | 38篇 |
出版年
2023年 | 63篇 |
2022年 | 171篇 |
2021年 | 199篇 |
2020年 | 95篇 |
2019年 | 90篇 |
2018年 | 185篇 |
2017年 | 199篇 |
2016年 | 283篇 |
2015年 | 178篇 |
2014年 | 276篇 |
2013年 | 473篇 |
2012年 | 358篇 |
2011年 | 406篇 |
2010年 | 266篇 |
2009年 | 255篇 |
2008年 | 337篇 |
2007年 | 286篇 |
2006年 | 259篇 |
2005年 | 255篇 |
2004年 | 267篇 |
2003年 | 229篇 |
2002年 | 192篇 |
2001年 | 113篇 |
2000年 | 56篇 |
1999年 | 53篇 |
1998年 | 31篇 |
1997年 | 38篇 |
1996年 | 33篇 |
1995年 | 39篇 |
1994年 | 35篇 |
1993年 | 15篇 |
1992年 | 16篇 |
1991年 | 24篇 |
1990年 | 18篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 13篇 |
1985年 | 14篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 7篇 |
1981年 | 11篇 |
1979年 | 10篇 |
1975年 | 5篇 |
1966年 | 6篇 |
1965年 | 5篇 |
1964年 | 6篇 |
1961年 | 5篇 |
1958年 | 5篇 |
排序方式: 共有6016条查询结果,搜索用时 546 毫秒
951.
Efficiency of white lupin in the removal of mercury from contaminated soils: Soil and hydroponic experiments 总被引:1,自引:0,他引:1
Pilar Zornoz Roc′?o Mill′an M. Jos′e Sierr Almudena Seco Elvira Esteban 《环境科学学报(英文版)》2010,22(3):421-427
This study examined the ability of the white lupin to remove mercury (Hg) from a hydroponic system (Hg concentrations 0, 1.25, 2.5, 5 and 10 μmol/L) and from soil in pots and lysimeters (total Hg concentration (19.2 ± 1.9) mg/kg availability 0.07%, and (28.9 ± 0.4) mg/kg availability 0.09%, respectively), and investigated the accumulation and distribution of Hg in different parts of the plant. White lupin roots efficiently took up Hg, but its translocation to the harvestable parts of the plant was low. The Hg concentration in the seeds posed no risk to human health according to the recommendations of the World Health Organization, but the shoots should not be used as fodder for livestock, at least when unmixed with other fodder crops. The accumulation of Hg in the hydroponically-grown plants was linear over the concentration range tested. The amount of Hg retained in the roots, relative to the shoots, was almost constant irrespective of Hg dose (90%). In the soil experiments, Hg accumulation increased with exposure time and was the greater in the lysimeter than in the pot experiments. Although Hg removal was the greater in the hydroponic system, revealing the potential of the white lupin to extract Hg, bioaccumulation was the greatest in the lysimeter-grown plants; the latter system more likely reflects the true behaviour of white lupin in the field when Hg availability is a factor that limits Hg removal. The present results suggest that the white lupin could be used in long-term soil reclamation strategies that include the goal of profitable land use in Hg-polluted areas. 相似文献
952.
Caroline S. Chaboo Michael S. Engel Maria Lourdes Chamorro-Lacayo 《Die Naturwissenschaften》2009,96(9):1121-1126
Complex ethological adaptations and intraspecific interactions leave few fossil traces. We document three Dominican (20 million
years old [myo]) and Baltic (45 myo) amber fossils that exhibit firm evidence of highly integrated interactions between mothers
and offspring in the diverse camptosomate lineage of beetles (Chrysomelidae, leaf beetles). As in contemporary species, these
hard cases were initially constructed by mothers, then inherited and retained by offspring, which then elaborate this protective
domicile with an unusual but economical building material, their feces. The three fossils are classified in the Subfamily
Cryptocephalinae; two are classified in the tribe Chlamisini based on morphological evidence—the flattened head lacking a
sharp keel and long legs with simple recurved untoothed claws. These diagnostic features are not clearly visible in the third
specimen to permit more refined identification. These fossils provide more precise paleontological dating of tribal nodes
within the cryptocephaline radiation of leaf beetles. These fossils are the first and earliest evidence of mother–offspring
interaction, building behavior, and fecal recycling in Camptosomata beetles and of inheritance of architectural structures
in beetles. 相似文献
953.
Alexander Golub Jos Cozijnsen Annie Petsonk 《Mitigation and Adaptation Strategies for Global Change》2009,14(5):433-453
This article examines possibilities for linkage between the European Union Emissions Trading System (EU ETS) and Russia, with
a view to enhancing cooperation on a broader scale than the project-based approaches that have been tested thus far. Three
paths for possible EU-Russia linkage are presented by which the Russian Assigned Amount under the Kyoto Protocol can be greened
in order to stimulate emissions trading: 1. Joint implementation—reductions earned via individual projects in Russia; 2. Greened
allowances or green investment schemes; and 3. Linked cap-and-trade systems, in which a Russian domestic emissions trading
system would link with the European Union Emissions Trading System. The authors conclude that the third option, emissions
trading through linked domestic emissions trading systems, offers the best opportunities at the lowest transaction costs.
The authors discuss useful innovative instruments like call options and slip level arrangements on government-to-government
and business-to-business levels.
相似文献
Annie PetsonkEmail: |
954.
Making index insurance attractive to farmers 总被引:1,自引:0,他引:1
Anthony Patt Nicole Peterson Michael Carter Maria Velez Ulrich Hess Pablo Suarez 《Mitigation and Adaptation Strategies for Global Change》2009,14(8):737-753
There are several factors that influence whether people will want to participate in index insurance programs. A number of
these influence their attractiveness on economic grounds, including both the size and timing of the premium and potential
payouts, and the degree of risk aversion of the potential customers. Other factors make programs attractive for reasons that
are not economic, but no less valid. These have to do with the trust that people have in the insurance product and the organizations
involved in selling and managing it. Indeed, data from India, Africa, and South America show that these factors may be more
important than the economic ones in influencing demand. Index insurance pilot projects, in order to estimate demand for alternative
products, have typically involved a great deal of interaction with potential customers. It is important to recognize that
such interaction is crucial not just as a research tool, but also as a means to build understanding and trust in the products.
When scaling up from isolated pilots to operational programs, it is vital to recognize this trust building function by replicating
participation efforts in every community. In this paper, we examine the role of field games in establishing and building trust
in three important aspects of these projects for participants: trust in the insurance product, trust in the participating
organizations, and trust in their own ability to make good decisions. While games have previously been used as a way to gauge
interest in the product and to identify design features, we argue that these games are also valuable tools for constructing
these kinds of trust. 相似文献
955.
956.
957.
Vanessa Ecla de Oliveira Ana Paula Vanin Ani Carla Concato Wagner A. Tamagno Helen Treichel Rosilene R. Kaizer 《环境质量管理》2019,29(1):147-154
This study examined behavioral and enzymatic changes of C. elegans from its exposure to aluminum, and the resulting relationship with Alzheimer's disease. After chronic and acute exposure to aluminum, the results indicated that it alters the cholinergic status and behavior parameters of the nematode, suggesting a relationship between exposure to aluminum and the etiology of AD. 相似文献
958.
Sidney Aluani Maria Cristina F. Spilborghs Rebecca H. H. Kim 《补救:环境净化治理成本、技术与工艺杂志》2016,26(4):117-125
Polychlorinated biphenyls (PCBs) are a persistent environmental issue worldwide. This study summarizes the results obtained from a bench‐scale test of remediating PCB‐impacted soil. The research aimed to evaluate the effectiveness of extracting the PCB Aroclor 1260 from soil, transferring it to a liquid matrix, and then treating the PCB‐containing liquid using an Activated Metal Treatment System, a technology developed by NASA based on zero valent magnesium (ZVMg). The soil was from a former electrical plant area impacted by PCBs. The initial concentration of untreated soil contained an average of 4.7 ± 0.15 mg/kg of Aroclor 1260. The results showed that the mass transfer phenomena is possible using ethanol as a liquid matrix, reaching transfer results up to 93 percent. The ZVMg enabled the destruction of the Aroclor 1260, which reached 20 percent without any buildup of undesirable by‐products, such as less chlorinated PCBs. ©2016 Wiley Periodicals, Inc. 相似文献
959.
960.