全文获取类型
收费全文 | 146篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 1篇 |
环保管理 | 13篇 |
综合类 | 38篇 |
基础理论 | 35篇 |
污染及防治 | 38篇 |
评价与监测 | 10篇 |
社会与环境 | 10篇 |
灾害及防治 | 1篇 |
出版年
2022年 | 4篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 10篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 6篇 |
2012年 | 9篇 |
2011年 | 11篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 5篇 |
2007年 | 6篇 |
2006年 | 13篇 |
2005年 | 11篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1983年 | 2篇 |
1962年 | 1篇 |
1959年 | 1篇 |
1958年 | 2篇 |
1955年 | 1篇 |
排序方式: 共有149条查询结果,搜索用时 46 毫秒
91.
Gabriele Kröger Jürgen Pietsch Kay Ufermann 《Environmental science and pollution research international》1999,6(3):170-174
Starting from an ecological perspective of urban-industrial areas, environmental accounting is used to analyse and to evaluate which environmental impacts are the result of communal activities (e.g. the results of different kinds of water supply systems). Therefore, the anthropogenic fluxes, the changing quality of areas as well as the processes between the environmental fields are taken into account. The approach is based on methodical elements of te Life Cycle Analysis and the Environmental Impact Assessment. Looking at the ‘urban systems’ within the communal activities, ‘ecological modelling’ gives us a new and fuller picture of the spatial and temporal character of urban metabolism. The approach supports the perception of cumulative effects and the postponement of environmental problems and opens new horizons for process-oriented environmental planning within the community. Greater efficiency and a decrease in costs can be arrived at by leaving ‘end of the pipe’ strategies; opportunities for a better planning process and measures for different individuals and organisations can be drawn up. A data base which acts as a ‘support system’ implements the computer-aided approach to environmental accounting. 相似文献
92.
Floral colour patterns are contrasting colour patches on flowers, a part of the signalling apparatus that was considered to display shape and colour signals used by flower-visitors to detect flowers and locate the site of floral reward. Here, we show that flower-naïve bumblebees (Bombus terrestris) spontaneously direct their approach towards the outside margin of artificial flowers, which provides contrast between these dummy flowers and the background. If no floral guides are present, the bumblebees continue to approach the margin and finally touch the marginal area of the dummy flower with the tips of their antennae. Whilst approaching dummy flowers that also have a central floral guide, the bumblebees change their direction of flight: Initially, they approach the margin, later they switch to approaching the colour guide, and finally they precisely touch the floral guide with their antennae. Variation of the shape of equally sized dummy flowers did not alter the bumblebees’ preferential orientation towards the guide. Using reciprocal combinations of guide colour and surrounding colour, we showed that the approach from a distance towards the corolla and the antennal contact with the guide are elicited by the same colour parameter: spectral purity. As a consequence, the dummy flowers eliciting the greatest frequency of antennal reactions at the guide are those that combine a floral guide of high spectral purity with a corolla of less spectral purity. Our results support the hypothesis that floral guides direct bumblebees’ approaches to the site of first contact with the flower, which is achieved by the tips of the antennae.Electronic Supplementary Material Supplementary material is available for this article at 相似文献
93.
94.
95.
Antonio?Piersanti Fabio?MonfortiEmail author Gabriele?Zanini 《Environmental Modeling and Assessment》2005,10(4):291-301
Three state of the art traffic–emission–dispersion models dealing with particulate matter have been tested and validated over
the Bologna metropolitan area with 2001 data and a future scenario has been developed in order to estimate expected PM concentrations
in 2010. The modelling system is composed by a traffic model (VISUM) evaluating vehicle fluxes as a function of mobility demand
and road network in the area, an emission model (Trefic) estimating pollutants emitted in atmosphere as a function of vehicle
fluxes amount and composition and of environmental conditions and a dispersion model (ADMS) evaluating PM concentrations on
the area, given the meteorological variables. The three models compose a cascade sequence and results of the previous one
feed the next one. PM concentrations computed by the model suite for the town of Bologna, in northern Italy, for the reference
period (January 2001) have been compared with air quality stations measurements suggesting the modelling system being especially
suitable for evaluating traffic induced PM. Qualitative and quantitative changes in the circulating vehicle fleet have been
supposed in order to obtain a realistic scenario for year 2010. Forecasted concentrations have been then compared with limits
fixed by current EU legislation for particulate matter. 相似文献
96.
Gabriele Klumpp Andreas Klumpp Marisa Domingos Robert Guderian 《Environmental monitoring and assessment》1995,35(1):27-42
In the frame of an active monitoring study at the Serra do Mar near the industrial pool of Cubatão, Brazil,Hemerocallis was tested for its suitability as bioindicator of airborne fluoride pollution. In a screening experiment with various cultivars comparison of susceptibility, correlation of visible injury and foliar fluoride concentration as well as comparison with exposure ofGladiolus gave best results for theHemerocallis cultivar ‘Red Moon’. When exposed simultaneously foliar fluoride accumulation ofHemerocallis showed a highly significant linear correlation with fluoride content ofLolium multiflorum, the ‘standardized grass culture’ andGladiolus, well-known bioindicator species for fluoride impact. With respect to the extent of foliar injuryHemerocallis was less sensitive thanGladiolus, in terms of accumulation capacity it ranged betweenLolium andGladiolus. In general, the results of the biomonitoring study proved that the Atlantic Forest vegetation in a valley downwind from the Cubatão fertilizer industries is still suffering from severe fluoride pollution. 相似文献
97.
Alessandro K. Cerutti Marco Bagliani Gabriele L. BeccaroFabrizio Gioelli Paolo BalsariGiancarlo Bounous 《Journal of Cleaner Production》2011,19(4):318-324
Ecological Footprint Analysis (EFA) is an environmental accounting system, in physical unit, able to quantify the total amount of ecosystem resources required by a region or by a production process. This methodology is both scientifically robust and widely diffused for territorial and productive analysis. The application of EFA to agricultural systems are still uncommon and examples in the fruit sector rare.In this work a detailed application of EFA to an experimental trial in a commercial nectarine orchard in Piedmont (Italy) is presented. The field trial is focused on the evaluation of agronomical benefit of various kinds of swine manure for fertilizing orchards. Four productive systems were established from 2008: liquid slurry (LS), covered slurry (CS), solid fraction (SF), mineral nutrition (MN). All the environmental impacts of the four systems were quantified both directly on field and with extrapolations from farmer knowledge. As previous studies suggested, we considered not only the one-year field operations, but also the whole lifetime of the orchard. The environmental costs of each system are presented and related to each other on the basis of their relative footprint value.Results highlight almost the same ecological footprint for the three manure fertilized systems (LS, CS and SF) with average of 0.96 gha t−1) and the highest ecological footprint can be found in the MN system (1.14 gha t−1). Interesting remarks can be done comparing the contributions to the ecological footprint of the field operations related to fertilization in the four systems. In the manure fertilized systems the fertilizer contribution goes from 0.9% to 1.2% of the total ecological footprint; but in the MN system the fertilizer contribution is 6.6% of the total ecological footprint. Results support the hypothesis that internal recycle and connections among different systems increasingly resulted in high system benefit and sustainability. 相似文献
98.
Patrick Gautier Marco Barroca Sophie Bertrand Cyril Eraud Maria Gaillard Michael Hamman Sébastien Motreuil Gabriele Sorci Bruno Faivre 《Behavioral ecology and sociobiology》2008,62(7):1159-1166
Several environmental factors have been shown to shape the pattern of investment of carotenoids into the expression of sexual
signals. Surprisingly, the impact of the social environment has been neglected. If a carotenoid-based sexual trait is used
by females to choose a mate or by males to assess the quality of potential competitors for mates, males, in the presence of
females, should upregulate expression of the trait. We tested this hypothesis in male zebra finches that were housed either
with females or in a male-only social environment. Additionally, to investigate whether the social modulation of the expression
of a sexual trait depends on the physiological need of carotenoids, we challenged half of the males with Escherichia coli lipopolysaccharide (LPS). We found that the social environment modulated the expression of bill color, with males kept in
the presence of females harboring a redder bill at the end of the 3 weeks that the experiment lasted. Males injected with
LPS showed duller bill color regardless of the presence of females, and social interactions with females result in upregulated
bill color similarly for phosphate-buffered saline (PBS) and LPS males. Thus, social environment and immune activation had
an additive effect on the expression of bill color. The effect of social environment on plasma carotenoids was less clear.
Indeed, a first replicate of the entire experiment showed that both immune challenge and social context affected bill color,
with a negative effect of immune challenge and a positive effect of the presence of females on circulating carotenoids. However,
a second replicate of the experiment showed only a negative effect of the immune challenge. These results, therefore, suggest
that the social environment can affect the expression of carotenoid-based sexual traits under both benign and carotenoid-demanding
conditions. Whatever the signaling function of bill color (female mate choice or male–male competition for mates), the observed
flexibility may be adaptive because the expression of the signal can be modulated depending on the expected rewards or costs
associated with the presence or absence of females. Nevertheless, the mechanisms underlying such an effect are still unknown. 相似文献
99.
Using fatty acid analysis to elucidate the feeding habits of Southern Ocean mesopelagic fish 总被引:1,自引:0,他引:1
Fatty acid biomarkers were used to investigate the feeding ecology of 17 mesopelagic fish species occurring in the Southern
Ocean. Fatty acid signatures of species where little or no dietary information exists were compared to fatty acid signatures
of species of known diets in order to elucidate their trophic position. Principal component analysis grouped species of known
diets into two clusters with amphipods and copepods comprising the main prey species, respectively. Although the majority
of species of unknown diet were grouped with either of these feeding guilds, a third cluster comprising only Gymnoscopelus bolini was identified suggesting a significantly different diet for this species. Electrona antarctica also exhibited significant changes in fatty acid signatures with size. Furthermore, discriminant analysis of the four most
abundant species classified species with a 90% success rate thus validating the usefulness of fatty acid signatures when trying
to resolve the trophic position of species where no or little dietary information exists. 相似文献
100.
Mehmet Coelhan Gerda Fingerling Gabriele Christ und Harun Parlar 《Umweltwissenschaften und Schadstoff-Forschung》1998,10(1):59
Zusammenfassung Die Rückstandsanalytik des Insektizides Toxaphen galt früher als problematisch wegen der gro?en Anzahl an Komponenten mit
?hnlicher Struktur und unterschiedlichem Chlorgehalt. Erschwerend kam hinzu, da? die Zusamensetzung von Toxaphenrückst?nden
in Umweltproben sich von der des technischen Standards signifikant unterscheidet. Deshalb war die Quantifizierung einzelner
Komponenten früher nicht m?glich. Seit jedoch eine ganze Reihe von Toxaphenkomponenten in ausreichenden Mengen isoliert wurden,
von denen einige für Umweltproben repr?sentativ sind, besteht die M?glichkeit, Toxaphenrückst?nde in Umweltkompartimenten
zuverl?ssig zu bestimmen. In der letzten Zeit konzentriert sich die Entwicklung vor allem auf die Trennung der chiralen Bestandteile
des Gemisches, um anhand der Zusammensetzung der Rückst?nde Verteilungswege und Abbaumechanismen besser identifizieren zu
k?nnen.
Residue analysis of toxaphene has been difficult because of the complexicity of the technical mixture consisting of a high number of compounds with very similar structure and differing chloro content. Furthermore, the composition of toxaphene in environmental samples varies widely and is normally not like that of the technical mixture. Therefore, quantification of single components in environmental samples was impossible. After the isolation and identification of a great number of components during the last decade, enough standards are available for reliable quantification of toxaphene in all environmental compartments. Recently, most research has been done on the separation of chiral components of toxaphene with a view to identify degradation mechanisms and distribution pathways.相似文献