全文获取类型
收费全文 | 236篇 |
免费 | 1篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 16篇 |
环保管理 | 22篇 |
综合类 | 32篇 |
基础理论 | 69篇 |
环境理论 | 2篇 |
污染及防治 | 59篇 |
评价与监测 | 12篇 |
社会与环境 | 19篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 10篇 |
2015年 | 3篇 |
2014年 | 13篇 |
2013年 | 12篇 |
2012年 | 13篇 |
2011年 | 11篇 |
2010年 | 11篇 |
2009年 | 19篇 |
2008年 | 17篇 |
2007年 | 20篇 |
2006年 | 13篇 |
2005年 | 14篇 |
2004年 | 6篇 |
2003年 | 13篇 |
2002年 | 10篇 |
2001年 | 5篇 |
1999年 | 4篇 |
1998年 | 7篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有242条查询结果,搜索用时 437 毫秒
191.
192.
Effects of Experimental Otter Trawling on Surficial Sediment Properties of a Sandy-Bottom Ecosystem on the Grand Banks of Newfoundland 总被引:3,自引:0,他引:3
193.
Migration of uranium(IV)/(VI) in the presence of humic acids in quartz sand: a laboratory column study 总被引:1,自引:0,他引:1
Mibus J Sachs S Pfingsten W Nebelung C Bernhard G 《Journal of contaminant hydrology》2007,89(3-4):199-217
The migration behavior of U(IV) and U(VI) in the presence of humic acid was studied in a quartz sand system. Laboratory column experiments were performed using humic acid, U(VI) in humic acid absence, U(IV) and U(VI) in humic acid presence, and for comparison a conservative tracer. In experiments using humic acid, both redox species of U migrate nearly as fast as the conservative tracer. Humic acid accelerates the U(VI) breakthrough compared to the humic acid-free system. There are strong indications for a similar effect on the U(IV) transport. At the same time, a part of U(IV) and U(VI) associated with the humic acid is immobilized in the quartz sand due to humic colloid filtration thus producing a delaying effect. Tailing at a low concentration level was observed upon tracer elution. The experimental breakthrough curves were described by reactive transport modeling using equations for equilibrium and kinetic reactions. The present study demonstrates that humic acids can play an important role in the migration of actinides. As natural organic matter is ubiquitous in aquifer systems, the humic colloid-borne transport of actinides is of high relevance in performance assessment. 相似文献
194.
Holtze MS Hansen HC Juhler RK Sørensen J Aamand J 《Environmental pollution (Barking, Essex : 1987)》2007,148(1):343-351
This is the first detailed study of metabolite production during degradation of the herbicide 2,6-dichlorobenzonitrile (dichlobenil). Degradation of dichlobenil and three potential metabolites: 2,6-dichlorobenzamide (BAM), 2,6-dichlorobenzoic acid (2,6-DCBA) and ortho-chlorobenzamide (OBAM) was studied in soils either previously exposed or not exposed to dichlobenil using a newly developed HPLC method. Dichlobenil was degraded in all four soils; BAM and 2,6-DCBA were only degraded in soils previously exposed to dichlobenil (100% within 35-56 days and 85-100% in 56 days, respectively), and OBAM in all four soils (25-33% removal in 48 days). BAM produced from dichlobenil was either hydrolyzed to 2,6-DCBA or dechlorinated to OBAM, which was further hydrolyzed to ortho-chlorobenzoic acid. BAM was rapidly mineralized in previously exposed soils only. All potential metabolites and the finding that BAM was a dead-end metabolite of dichlobenil in soils not previously exposed to dichlobenil needs to be included in risk assessments of the use of dichlobenil. 相似文献
195.
Jens K. Nielsen Mads L. Hansen Niels Agerbirk Bent L. Petersen Barbara A. Halkier 《Chemoecology》2001,11(2):75-83
Summary. Insects feeding on Cruciferae recognize their host plants at least partially by means of specific responses to glucosinolates. However, the effects of variations in glucosinolate levels on the acceptability of plants for specialized insects are not well understood. A survey of the literature demonstrated positive, no, as well as negative correlations between plant acceptability and glucosinolate levels. The present study took advantage of the presence of transgenic Arabidopsis thaliana plants with increased glucosinolate levels. Transgenic A. thaliana contain the CYP79A1 gene from Sorghum bicolor. This gene encodes an enzyme which converts L-tyrosine into p-hydroxyphenylacetaldoxime in the biosynthesis of cyanogenic glycosides in S. bicolor. In transgenic A. thaliana plants, endogenous enzymes convert p-hydroxyphenylacetaldoxime into p-hydroxybenzylglucosinolate (sinalbin), which is not found naturally in this plant. The introduction of CYP79A1 resulted in a four-fold increase in total glucosinolate levels in transgenic A. thaliana plants. Although these changes in glucosinolate levels were rather dramatic, they did not have any effects on the acceptability of A. thaliana for the two flea beetle species, Phyllotreta nemorum and P. cruciferae. The flea beetles did not discriminate between transgenic and wildtype plants. Furthermore, they did not discriminate between leaf discs of wildtype plants where different concentrations of p-hydroxybenzylglucosinolate had been applied topically on the leaf surface. Feeding in P. nemorum was stimulated by extremely high levels of allylglucosinolate while this compound had no effect on P. cruciferae. It is concluded that the effect of glucosinolates on adapted insects depends on the chemical or physical environment in which the glucosinolates are found. 相似文献
196.
197.
Jesper H. Andersen Henrik Fossing Jens W. Hansen Ole H. Manscher Ciarán Murray Ditte L. J. Petersen 《Ambio》2014,43(7):906-913
Nutrient enrichment of coastal marine waters caused by losses of nitrate (NO3−) from agriculture is an increasing global problem. In the European Union, the Nitrates Directive (ND) of 1991 was meant to be a cornerstone in reducing eutrophication effects in coastal waters downstream from intensively farmed catchments. Although reductions in losses of nitrate have been attained, very few Member States have yet been able to reduce eutrophication effects caused by inputs of NO3− from agriculture. We report trends in concentrations of NO3− and chlorophyll-a (Chl-a) in Danish coastal and open marine waters during the period from 1996 to 2011 together with an assessment of eutrophication status based on multiple indicators (e.g. nutrient concentrations, Chl-a, submerged aquatic vegetation and benthic macroinvertebrates). Despite decreasing concentrations of both NO3−and Chl-a, Danish coastal waters are not yet to be classified as ‘unaffected by eutrophication’. In order to improve future pan-European evaluations of the effectiveness of the ND, we argue for the added value of including indicators and assessment principles from other European Directives, i.e. the Water Framework Directive and the Marine Strategy Framework Directive.
Electronic supplementary material
The online version of this article (doi:10.1007/s13280-014-0514-y) contains supplementary material, which is available to authorized users. 相似文献198.
Tarmo Soomere Kristofer Döös Andreas Lehmann H. E. Markus Meier Jens Murawski Kai Myrberg Emil Stanev 《Ambio》2014,43(1):94-104
The ever increasing impact of the marine industry and transport on vulnerable sea areas puts the marine environment under exceptional pressure and calls for inspired methods for mitigating the impact of the related risks. We describe a method for preventive reduction of remote environmental risks caused by the shipping and maritime industry that are transported by surface currents and wind impact to the coasts. This method is based on characterizing systematically the damaging potential of the offshore areas in terms of potential transport to vulnerable regions of an oil spill or other pollution that has occurred in a particular area. The resulting maps of probabilities of pollution to be transported to the nearshore and the time it takes for the pollution to reach the nearshore are used to design environmentally optimized fairways for the Gulf of Finland, Baltic Proper, and south-western Baltic Sea. 相似文献
199.
Lyndon A. Jordan Carla Avolio James E. Herbert-Read Jens Krause Daniel I. Rubenstein Ashley J. W. Ward 《Behavioral ecology and sociobiology》2010,64(7):1099-1106
The benefits of grouping behaviour may not be equally distributed across all individuals within a group, leading to conflict
over group membership among established group members, and between residents and outsiders attempting to join a group. Although
the interaction between the preferences of joining individuals and existing group members may exert considerable pressure
on group structure, empirical work on group living to date has focussed on free entry groups, in which all individuals are
permitted entry. Using the humbug damselfish, Dascyllus aruanus, we examined a restricted entry grouping system, in which group residents control membership by aggressively rejecting potential
new members. We found that the preferences shown by joining members were not always aligned with strategies that incurred
the least harm from resident group members, suggesting a conflict between the preferences of residents and preferences of
group joiners. Solitary fish preferred to join familiar groups and groups of size-matched residents. Residents were less aggressive
towards familiar group joiners. However, resident aggression towards unfamiliar individuals depended on the size of the joining
individual, the size of the resident and the composition of the group. These results demonstrate that animal group structure
is mediated by both the preferences of joining individuals and the preferences of residents. 相似文献
200.
Psychological and physiological stress responses of 36 male and 29 female assembly workers were examined during and after work at a car engine factory. Two different ways of organizing assembly work were compared, (1) a more traditional assembly line with fixed work stations organized as a chain and involving short repetitive work cycles and, (2) a new and more flexible work organization with small autonomous groups having greater opportunities to influence the pace and content of their work. Each worker was examined during and after a normal day at work on 2 consecutive days and, in order to obtain endocrine baseline data, during a corresponding work‐free period at home. As expected, both female and male workers in the flexible organization reported significantly more variation, independence and abilities to learn new skills at work. Workers in both forms of work organization showed a significant increase in urinary epinephrine and norepinephrine during work compared to the work‐free day at home. Males had significantly higher epinephrine and systolic blood pressure levels than females. Successive self‐reports of tiredness increased significantly more at the assembly line compared to the flexible work organization. In keeping with this, systolic blood pressure, heart rate and epinephrine increased significantly during the work shift at the assembly line but not during work in the flexible organization. Catecholamine levels revealed that the subjects were able to unwind more rapidly after work in the flexible organization. This pattern was particularly pronounced for the female workers. In summary, the various stress indicators support the notion that the flexible work organization induces less stress than the assembly line and that the female workers were able to benefit most from this new form of work organization. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献