全文获取类型
收费全文 | 261篇 |
免费 | 7篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 54篇 |
环保管理 | 36篇 |
综合类 | 43篇 |
基础理论 | 31篇 |
污染及防治 | 80篇 |
评价与监测 | 18篇 |
社会与环境 | 6篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2017年 | 10篇 |
2016年 | 6篇 |
2015年 | 6篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 17篇 |
2011年 | 30篇 |
2010年 | 20篇 |
2009年 | 19篇 |
2008年 | 12篇 |
2007年 | 17篇 |
2006年 | 13篇 |
2005年 | 8篇 |
2004年 | 25篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1989年 | 1篇 |
1985年 | 2篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有271条查询结果,搜索用时 15 毫秒
121.
Peter Wells Gill Bristow Paul Nieuwenhuis Thomas Budde Christensen 《Journal of Cleaner Production》2009,17(12):1116-1122
This paper demonstrates the relative non-engagement of universities in regional sustainability initiatives through a case study of Cardiff University in Wales. It is argued that the turbulent and often complicated political and administrative context along with divergent goals and performance targets means that synergies are less readily achieved. A case study of automotive industry alternative technology new cluster development is given to illustrate the arguments. In so doing, the paper presents the view that we need to move beyond mere optimism in order to address fundamental underlying issues. 相似文献
122.
123.
V. C. Hammen J. C. Biesmeijer R. Bommarco E. Budrys T. R. Christensen S. Fronzek R. Grabaum P. Jaksic S. Klotz P. Kramarz G. Kröel-Dulay I. Kühn M. Mirtl M. Moora T. Petanidou J. Pino S. G. Potts A. Rortais C. H. Schulze I. Steffan-Dewenter J. Stout H. Szentgyörgyi M. Vighi A. Vujic C. Westphal T. Wolf G. Zavala M. Zobel J. Settele W. E. Kunin 《Environmental monitoring and assessment》2010,164(1-4):337-348
The field site network (FSN) plays a central role in conducting joint research within all Assessing Large-scale Risks for biodiversity with tested Methods (ALARM) modules and provides a mechanism for integrating research on different topics in ALARM on the same site for measuring multiple impacts on biodiversity. The network covers most European climates and biogeographic regions, from Mediterranean through central European and boreal to subarctic. The project links databases with the European-wide field site network FSN, including geographic information system (GIS)-based information to characterise the test location for ALARM researchers for joint on-site research. Maps are provided in a standardised way and merged with other site-specific information. The application of GIS for these field sites and the information management promotes the use of the FSN for research and to disseminate the results. We conclude that ALARM FSN sites together with other research sites in Europe jointly could be used as a future backbone for research proposals. 相似文献
124.
ABSTRACTThis study examines a community garden in Copenhagen, Denmark, "The Urban Integration Gardens" that endeavours to strengthen social integration in the local multicultural neighbourhood. The "community" in the gardens is explored, with a focus on how they foster social capital, particularly opportunities for "bridging" social capital. A mixed-methods approach is used, by employing a qualitative analysis of gardeners’ perceptions of "community", diversity and inclusivity, through the lens of "cognitive" social capital, and the meanings the gardeners assign to their experiences, and how they understand their involvement in the gardens. We also examine "structural" dimensions of social capital, involving quantitative data from a questionnaire and data from Statistics Denmark, comparing data concerning socio-demographic backgrounds from gardeners and residents in the local neighbourhood and Copenhagen. Major findings include that the garden generates both bonding and bridging "cognitive" social capital, and the gardeners consistently agreed that the garden has a strong community, and is permeated by diversity and inclusivity. Nonetheless, data from Denmark’s Statistics Office reveal that the garden does not "represent" the diversity in the neighbourhood regarding the distribution of members with a Western/non-Western background, as well as social class. This suggests that endeavours to involve co-citizens with non-Western backgrounds and gardeners with lower social status are restrained by potential structural barriers, which limits the "width" of bridging social capital in the garden. 相似文献
125.
Waste incineration bottom ash and treated flue gas cleaning products mixed with 2.5% of cement (50 kg/m3) were tested in the laboratory in terms of compressive strength and tank leaching tests over a 64-day period. Although the material displayed lower mechanical strength than a reference concrete, the strength still was sufficient for use as a base layer for roads. The metal content in the incineration-residue-based specimens was up to 100 times higher than in the reference concrete, suggesting that the mixed waste incineration residue should be used only for dedicated purposes. The leaching of Cl and Na was increased by a factor of 20-100 from the incineration-residue-based specimens as compared to the reference, while the leaching of K, Ca and SO4 was increased by a factor of 2-10. The leaching of heavy metals was also higher from the incineration-residue-based specimens than from the reference with respect to Cu (50 times), Cd, Pb and Zn (5 times), but not with respect to Cr and Ni. The leaching curves did only allow for a closer evaluation of the leaching process in a few cases. The physical retention of the constituents seemed to be the same in the reference as in the incineration-residue-based specimens. Heavy metal leaching was limited by enhanced chemical retention in the incineration-residue-specimens as compared to the reference. Since no quality criteria in terms of leaching from a monolithic material are currently available, the leaching issue must be evaluated case by case. 相似文献
126.
Gewurtz SB Laposa R Gandhi N Christensen GN Evenset A Gregor D Diamond ML 《Chemosphere》2006,63(8):1328-1341
In order to compare the abilities of arctic and temperate fish to accumulate PCBs we conduct a metabolic analysis to determine how process rates in a mathematical fish contaminant model change with temperature. We evaluate the model by applying the original and adapted models to estimate PCB concentrations in lake trout (Salvelinus namaycush) in Trout Lake, Ontario, Canada, and in arctic char (Salvelinus alphinus) in Lake ?yangen, in the Norwegian high arctic. Modeled concentrations are, for the most part, within 50% of mean measured values and are comparable to the error associated with the fish data. In order to evaluate differences in fish bioaccumulation processes, the model is applied to hypothetical arctic and temperate systems, assuming the same contaminant input values in water and diet. The model predicts that temperate salmonids are able to biomagnify PCBs 6-60% more than arctic salmonids. For all congeners, the lower BMF(MAX) of arctic fish contribute to their lower concentrations. For congeners with log K(ow) < 6.0, the lower concentrations in arctic fish are also attributed to faster loss due to gill ventilation. Faster growth rates for temperate fish reduce the difference in bioaccumulation for congeners with log K(ow) > 7.0. These processes are controlled by the influence of lipid in the fish and their diet as well as the dependence of growth on temperature. We suggest that fish models originally calibrated for temperate systems may be directly applied to arctic lakes after accounting for the lipid content of the fish and their diet as well as water temperature. 相似文献
127.
Christian Riber Gry S Fredriksen Thomas H Christensen 《Waste management & research》2005,23(2):126-132
Data on the heavy metal composition of outlets from Danish incinerators was used to estimate the concentration of Zn, Cu, Pb, Cr, Ni, Cd, As and Hg in combustible waste (wet as received) at 14 Danish incinerators, representing about 80% of the waste incinerated in Denmark. Zn (1020 mg kg(-1)), Cu (620 mg kg(-1)) and Pb (370 mg kg(-1)) showed the highest concentration, whereas Hg (0.6 mg kg(-1)) showed the lowest concentration. The variation among the incinerators was in most cases within a factor of two to three, except for Cr that in two cases showed unexplained high concentrations. The fact that the data represent many incinerators and, in several cases, observations from a period of 4 to 5 years provides a good statistical basis for evaluating the content of heavy metals in combustible Danish waste. Such data may be used for identifying incinerators receiving waste with high concentrations of heavy metals suggesting the introduction of source control, or, if repeated in time, the data must also be used for monitoring the impacts of national regulation controlling heavy metals. It is recommended that future investigations consider the use of sample digestion methods that ensure complete digestion in order to use the data for determining the total heavy metal content of waste. 相似文献
128.
Long-Term Benthic Macroinvertebrate Community Monitoring to Assess Pollution Abatement Effectiveness
The benthic macroinvertebrate community of East Fork Poplar Creek (EFPC) in East Tennessee was monitored for 18 years to evaluate
the effectiveness of a water pollution control program implemented at a major United States (U.S.) Department of Energy facility.
Several actions were implemented to reduce and control releases of pollutants into the headwaters of the stream. Four of the
most significant actions were implemented during different time periods, which allowed assessment of each action. Macroinvertebrate
samples were collected annually in April from three locations in EFPC (EFK24, EFK23, and EFK14) and two nearby reference streams
from 1986 through 2003. Significant improvements occurred in the macroinvertebrate community at the headwater sites (EFK24
and EFK23) after implementation of each action, while changes detected 9 km further downstream (EFK14) could not be clearly
attributed to any of the actions. Because the stream was impacted at its origin, invertebrate recolonization was primarily
limited to aerial immigration, thus, recovery has been slow. As recovery progressed, abundances of small pollution-tolerant
taxa (e.g., Orthocladiinae chironomids) decreased and longer lived taxa colonized (e.g., hydropsychid caddisflies, riffle
beetles, Baetis). While assessments lasting three to four years may be long enough to detect a response to new pollution controls at highly
impacted locations, more time may be needed to understand the full effects. Studies on the effectiveness of pollution controls
can be improved if impacted and reference sites are selected to maximize spatial and temporal trending, and if a multidisciplinary
approach is used to broadly assess environmental responses (e.g., water quality trends, invertebrate and fish community assessments,
toxicity testing, etc.). 相似文献
129.
Simone ManfrediDavide Tonini Thomas H. Christensen 《Resources, Conservation and Recycling》2011,55(11):995-1004
Several alternatives exist for handling of individual waste fractions, including recycling, incineration and landfilling. From an environmental point of view, the latter is commonly considered as the least desirable option. Many studies based on life-cycle assessment (LCA) highlight the environmental benefits offered by incineration and especially by recycling. However, the landfilling option is often approached unjustly in these studies, maybe disregarding the remarkable technological improvements that landfills have undergone in the last decades in many parts of the world.This study, by means of LCA-modelling, aims at comparing the environmental performance of three major management options (landfilling, recycling and incineration or composting) for a number of individual waste fractions. The landfilling option is here approached comprehensively, accounting for all technical and environmental factors involved, including energy generation from landfill gas and storage of biogenic carbon. Leachate and gas emissions associated to each individual waste fraction have been estimated by means of a mathematical modelling. This approach towards landfilling emissions allows for a more precise quantification of the landfill impacts when comparing management options for selected waste fractions.Results from the life-cycle impact assessment (LCIA) show that the environmental performance estimated for landfilling with energy recovery of the fractions “organics” and “recyclable paper” is comparable with composting (for “organics”) and incineration (for “recyclable paper”). This however requires high degree of control over gas and leachate emissions, high gas collection efficiency and extensive gas utilization at the landfill. For the other waste fractions, recycling and incineration are favourable, although specific emissions of a variety of toxic compounds (VOCs, PAHs, NOx, heavy metals, etc.) may significantly worsen their environmental performance. 相似文献
130.
A combined ecosystem and value chain modeling approach for evaluating societal cost and benefit of fishing 总被引:1,自引:0,他引:1
We describe a combined ecological and economic approach aimed at giving more equal emphasis to both disciplines, while being integrated so that design, analysis, data entry and storage, and result capabilities are developed with emphasis on deriving a user-friendly, easily accessible tool. We have thus developed the approach as an integrated module of the freely available Ecopath with Ecosim scientific software; the world's most widely applied ecological modeling tool. We link the trophic ecosystem model to a value-chain approach where we explicitly and in considerable detail keep track of the flow (amounts, revenue, and costs) of fish products from sea through to the end consumer. We also describe the social aspects of the fish production and trade, by evaluating employment and income diagnostics. This is done with emphasis on distribution income while accounting for social aspects of the fishing sector. From a management perspective, one of the interesting aspects of the approach we introduce here, is that it opens for direct evaluation of what impact management interventions, e.g., quota settings, effort regulation, or area closures, may have on the ecosystem, the economy and the social setting, as well as on food availability for the consumer. 相似文献