全文获取类型
收费全文 | 672篇 |
免费 | 10篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 26篇 |
废物处理 | 26篇 |
环保管理 | 61篇 |
综合类 | 89篇 |
基础理论 | 146篇 |
环境理论 | 4篇 |
污染及防治 | 107篇 |
评价与监测 | 51篇 |
社会与环境 | 175篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 8篇 |
2022年 | 33篇 |
2021年 | 22篇 |
2020年 | 10篇 |
2019年 | 18篇 |
2018年 | 37篇 |
2017年 | 28篇 |
2016年 | 64篇 |
2015年 | 22篇 |
2014年 | 61篇 |
2013年 | 79篇 |
2012年 | 42篇 |
2011年 | 43篇 |
2010年 | 47篇 |
2009年 | 47篇 |
2008年 | 23篇 |
2007年 | 29篇 |
2006年 | 17篇 |
2005年 | 23篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 6篇 |
2001年 | 2篇 |
2000年 | 9篇 |
1999年 | 2篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1993年 | 1篇 |
排序方式: 共有688条查询结果,搜索用时 15 毫秒
621.
Zoe O’Hara Claire Crossan John Craft Linda Scobie 《Food and environmental virology》2018,10(2):217-221
Shellfish samples (n = 310) purchased from local supermarkets were analysed for the presence of hepatitis E virus (HEV) by nested RT-PCR and real-time qRT-PCR. Overall, 2.9% of samples tested positive for the presence of HEV. Phylogenetic analysis of HEV sequences revealed all as being genotype 3 HEV. This is the first report of the detection of HEV in commercially sold shellfish in Scotland. These findings may encourage further research that will help address the gaps in the knowledge in respect to foodborne transmission of HEV in Scotland and the rest of the United Kingdom. 相似文献
622.
Farrell AE 《Environmental monitoring and assessment》2005,107(1-3):59-80
The Montreal Process was formed in 1994 to develop an internationally agreed upon set of criteria and indicators for the conservation and sustainable management of temperate and boreal forests. In response to this initiative, the Forest Inventory and Analysis (FIA) and Forest Health Monitoring (FHM) programs of the United States Department of Agriculture Forest Service have implemented soil measurements as part of a national monitoring program to address specific questions related to the conservation of soil and water resources. Integration of soil assessments into the national FIA program provides for systematic monitoring of soil properties across all forested regions of the U.S. using standardized collection, laboratory, and statistical procedures that are compatible with existing forest inventory data. The resulting information will provide quantitative benchmarks for regional, national, and international reporting on sustainable forest management and enhance our understanding of management effects on soil quality. This paper presents an overview of the FIA soil monitoring program, outlines the field and laboratory protocols as currently implemented, and provides examples of how these data may be used to assess indicators of sustainable management as defined by the Montreal Process. 相似文献
623.
Breffní Lennon Niall Dunphy Christine Gaffney Alexandra Revez Gerard Mullally Paul O’Connor 《Journal of Environmental Policy & Planning》2020,22(2):184-197
ABSTRACTThe transition to more sustainable energy systems has set about redefining the social roles and responsibilities of citizens. Implicit in this are expectations around participation, though the precise contours of what this might mean remain open. Debates around the energy transition have been skewed towards a normative construct of what it means to be a ‘good citizen’, the parameters for which are shaped by predetermined visions of statist and/or market-driven determinations of the energy systems of the future. This article argues that concepts such as ‘energy citizen’ are co-opted to reflect popular neoliberal discourses, and ignore crucial questions of unequal agency and access to resources. Paradoxically, official discourses that push responsibility for the energy transition onto the ‘citizen-as-consumer’ effectively remove agency from citizens, leaving them largely disconnected and disempowered. Consequently, energy citizenship needs to be reconceptualised to incorporate more collective and inclusive contexts for action. Considering how much energy consumption occurs in (traditionally female) domestic spheres, do conventional notions of citizenship (especially with regards to its associated rights and duties) need to be recalibrated in order for the concept to be usefully applied to the energy transition? 相似文献
624.
Mick Lennon Phoebe Duvall Eoin O’Neill 《Journal of Environmental Policy & Planning》2020,22(3):301-314
ABSTRACTWilderness is most often conceived as comprising large remote areas where evidence of human influence is slight. Little attention has been afforded to the study of wilderness ‘making’ in smaller landscapes that have been heavily modified by human activity. This paper addresses this knowledge deficit by employing the pragmatic sociology of Boltanski and Thévenot to analyse a case study of wilderness making in the west of Ireland. The application of this framework illustrates how contending positions on ‘why’ wilderness making should occur and ‘how’ it should be conducted reflect ethical frameworks rooted in different conceptions of the ‘common good’ presented by the idea of wilderness. The paper demonstrates the difficulties with developing such a new nature-based concept in the absence of conventional (received) ideas of wilderness by revealing how the diverging justifications used suggest incommensurability in the competing notions of wilderness that are formulated and advanced. 相似文献
626.
C. E. O’Connell-Rodwell J. D. Wood T. C. Rodwell S. Puria S. R. Partan R. Keefe D. Shriver B. T. Arnason L. A. Hart 《Behavioral ecology and sociobiology》2006,59(6):842-850
Seismic communication is known to be utilized in insects, amphibians, reptiles, and small mammals, but its use has not yet
been documented in large mammals. Elephants produce low-frequency vocalizations, and these vocalizations have seismic components
that propagate in the ground, but it has not yet been demonstrated that elephants can detect or interpret these seismic signals.
In this study, we played back seismic replicates of elephant alarm vocalizations to herds of wild African elephants in their
natural environment and observed significant behavioral changes indicating that they had detected these signals. Seismic communication
may provide an important complement to existing communication modes used by elephants. Seismic sensitivity may also provide
elephants with an additional modality for sensing important environmental cues such as changes in weather patterns or seismic
disturbances. 相似文献
627.
The reproductive behaviour of 248 specimens comprising four size classes of the infaunal bivalve Abra alba (Wood) was investigated between September 1994 and November 1995 in Kinsale Harbour. Small males returned a very small proportion of sexually mature and spawning animals. By contrast, no spawning females were found in this size class, suggesting that males develop and mature at a smaller size than females. Mean gonad maturity indices indicated that, except for the smallest size class, A. alba exhibits two spawning events in 1 year, i.e. a lesser spring and a major autumn spawning event. The spring event was well synchronised between males and females, while the autumn spawning was more broadly synchronised between the sexes. Only one spawning event was recorded for very large males and females, also occurring in spring. Spawning stages were recorded for both sexes over all size classes between February and November, indicating only a short period of sexual repose, if any. Oocyte diameters did not show a discrete size range from developing to spawning stages. All stages were seen to contain varying proportions of smaller, less mature oocytes, suggesting that large A. alba females do not develop and spawn en bloc, but release their gametes periodically. Maturity indices showed only a broad similarity with off-bottom temperatures.Communicated by O. Kinne, Oldendorf/Luhe 相似文献
628.
629.
Intra-specific interactions influence egg composition in the lesser black-backed gull (Larus fuscus)
Nanette Verboven Neil P. Evans Liliana D’Alba Ruedi G. Nager Jonathan D. Blount Peter F. Surai Pat Monaghan 《Behavioral ecology and sociobiology》2005,57(4):357-365
Egg composition, which is under maternal control, can have a profound effect on offspring fitness. The presence of maternal testosterone and carotenoids in avian egg yolk, for example, is thought to enhance the development and competitive ability of the offspring and protect the hatching and growing chick against oxidative stress. Egg quality often differs between females and such variation can be due to differences in maternal social environment, e.g. breeding density. However, this is confounded by the possibility that the quality of individuals breeding in high- or low-density areas may vary. We tested if maternal social environment influences egg composition in a colonial seabird, the lesser black-backed gull (Larus fuscus). To control for confounding effects of female quality, we experimentally manipulated maternal social environment during egg formation. We increased the frequency of intra-specific interactions (i.e. aggressive encounters with conspecifics other than nest mates) in which the females were involved, by placing an elevated platform in their territory. Females that took part in more intra-specific interactions produced a heavier last egg, but the yolk testosterone concentration in eggs laid by control and experimental females did not differ. Differences in yolk testosterone concentration in relation to embryo sex were found neither in the control nor in the experimental group. In contrast, within the control group, eggs with a male embryo contained more carotenoids than eggs with a female embryo. Moreover, experimental females that had been involved in more intra-specific interactions produced female eggs with higher carotenoid levels compared to female eggs of control birds. An experimental increase in carotenoid levels was not observed in eggs containing a male embryo. Our results suggest that intra-specific interactions experienced by female birds during egg formation can influence conditions for embryonic development.Communicated by J. Graves 相似文献
630.
Extra-pair paternity is common in socially monogamous passerines; however, despite considerable research attention, consistent
differences in fitness between within-pair offspring (WPO) and extra-pair offspring (EPO) have not been demonstrated. Recent
evidence indicates that differences between maternal half-siblings may depend on environmental conditions, but it is unclear
whether the influence of paternal genetic contribution should be most apparent under comparatively poor or favourable conditions.
We compared phenotypic characteristics of WPO and EPO in 30 mixed-paternity broods of the tree swallow (Tachycineta bicolor) in relation to experimentally increased nest temperature (n = 13 heated nests; 17 control nests) and natural abundance of haematophagous parasites (Protocalliphora spp.). This allowed us to test the hypothesis that genetic benefits of extra-pair mating are environment dependent. EPO grew
their ninth primary feathers faster than WPO regardless of nest temperature or parasite load and had significantly longer
ninth primary feathers at fledging when parasite abundance was low, and when they were positioned early in the hatching sequence
relative to WPO. In contrast, WPO under similar conditions did not differ from EPO in any phenotypic trait measured. These
results indicate that the fitness benefits of extra-pair mating are likely to be context dependent, and that genetic effects
on some phenotypic traits may be more apparent when conditions are relatively favourable. 相似文献