全文获取类型
收费全文 | 112篇 |
免费 | 5篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 5篇 |
环保管理 | 20篇 |
综合类 | 10篇 |
基础理论 | 29篇 |
环境理论 | 1篇 |
污染及防治 | 22篇 |
评价与监测 | 8篇 |
社会与环境 | 7篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 8篇 |
2009年 | 5篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 9篇 |
2005年 | 1篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 15 毫秒
61.
Wang D Atkinson S Hoover-Miller A Lee SE Li QX 《Environmental pollution (Barking, Essex : 1987)》2007,146(1):268-280
Polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and its metabolites, heptachlor and hexachlorocyclohexanes (HCHs) were analyzed in the harbor seal (Phoca vitulina) tissues collected from the Gulf of Alaska during 2000-2001. summation SigmaPCBs (16-728 ng/gl w) and summation SigmaDDTs (14-368 ng/gl w) were the predominant pollutants followed by summation operatorHCHs (0.56-93 ng/gl w) and heptachlor (相似文献
62.
This paper contains a critical exploration of the social dimensions of the science–humanitarian relationship. Drawing on literature on the social role of science and on the social dimensions of humanitarian practice, it analyses a science–humanitarian partnership for disaster risk reduction (DRR) in Padang, Sumatra, Indonesia, an area threatened by tsunamigenic earthquakes. The paper draws on findings from case study research that was conducted between 2010 and 2011. The case study illustrates the social processes that enabled and hindered collaboration between the two spheres, including the informal partnership of local people and scientists that led to the co‐production of earthquake and tsunami DRR and limited organisational capacity and support in relation to knowledge exchange. The paper reflects on the implications of these findings for science–humanitarian partnering in general, and it assesses the value of using a social dimensions approach to understand scientific and humanitarian dialogue. 相似文献
63.
Wang D Shannon MC Grieve CM Shouse PJ Suarez DL 《Journal of environmental quality》2002,31(5):1684-1693
Soil and water resources can be severely degraded by salinity when total salt input exceeds output in irrigated agriculture. This study was conducted to examine partitioning of Ca2+, Na+, and Cl- between soil and soybean [Glycine max (L.) Merr.] plants under different irrigation regimes with both field and modeling assessments. In drip and sprinkler treatments, the irrigation water was salinized with NaCl and CaCl2 salts to simulate a Cl- and Na+ dominant saline drainage water. In the furrow irrigation treatment, the soil was salinized, prior to planting, with NaCl and CaCl2 salts to simulate a Cl- and Na+ dominant saline soil. A total of 756 soil and 864 plant samples were collected and analyzed for the salt ions to obtain ion partitioning and mass balance assessments. Modeling of salt ion uptake by plants and distribution in the soil profile was performed with a two-dimensional solute transport model for the three irrigation regimes. Results indicated that about 20% of the applied Ca2+ was recovered in harvested soybean biomass in all treatments. Plant uptake of either Na+ or Cl- was less than 0.5% in the drip and furrow, and about 2% in the sprinkler irrigation treatment. Significant increases in soil salinity were found in the sprinkler plot that received the highest cumulative amount of salts. Simulated ion distributions in the soil were comparable with the measurements. Compared with the total seasonal salt input, mass balances between 65 and 108% were obtained. Most salt inputs accumulate in the soil, and need to be removed periodically to prevent soil salinization. 相似文献
64.
James S Clark Michael Wolosin Michael Dietze Inés Ibá?ez Shannon LaDeau Miranda Welsh Brian Kloeppel 《Ecological applications》2007,17(7):1942-1953
Estimation of tree growth is based on sparse observations of tree diameter, ring widths, or increments read from a dendrometer. From annual measurements on a few trees (e.g., increment cores) or sporadic measurements from many trees (e.g., diameter censuses on mapped plots), relationships with resources, tree size, and climate are extrapolated to whole stands. There has been no way to formally integrate different types of data and problems of estimation that result from (1) multiple sources of observation error, which frequently result in impossible estimates of negative growth, (2) the fact that data are typically sparse (a few trees or a few years), whereas inference is needed broadly (many trees over many years), (3) the fact that some unknown fraction of the variance is shared across the population, and (4) the fact that growth rates of trees within competing stands are not independent. We develop a hierarchical Bayes state space model for tree growth that addresses all of these challenges, allowing for formal inference that is consistent with the available data and the assumption that growth is nonnegative. Prediction follows directly, incorporating the full uncertainty from inference with scenarios for "filling the gaps" for past growth rates and for future conditions affecting growth. An example involving multiple species and multiple stands with tree-ring data and up to 14 years of tree census data illustrates how different levels of information at the tree and stand level contribute to inference and prediction. 相似文献
65.
Claire Richardson Shannon Rutherford 《Journal of the Air & Waste Management Association (1995)》2018,68(6):598-607
Given the significance of mining as a source of particulates, accurate characterization of emissions is important for the development of appropriate emission estimation techniques for use in modeling predictions and to inform regulatory decisions. The currently available emission estimation methods for Australian open-cut coal mines relate primarily to total suspended particulates and PM10 (particulate matter with an aerodynamic diameter <10 μm), and limited data are available relating to the PM2.5 (<2.5 μm) size fraction. To provide an initial analysis of the appropriateness of the currently available emission estimation techniques, this paper presents results of sampling completed at three open-cut coal mines in Australia. The monitoring data demonstrate that the particulate size fraction varies for different mining activities, and that the region in which the mine is located influences the characteristics of the particulates emitted to the atmosphere. The proportion of fine particulates in the sample increased with distance from the source, with the coarse fraction being a more significant proportion of total suspended particulates close to the source of emissions. In terms of particulate composition, the results demonstrate that the particulate emissions are predominantly sourced from naturally occurring geological material, and coal comprises less than 13% of the overall emissions. The size fractionation exhibited by the sampling data sets is similar to that adopted in current Australian emission estimation methods but differs from the size fractionation presented in the U.S. Environmental Protection Agency methodology. Development of region-specific emission estimation techniques for PM10 and PM2.5 from open-cut coal mines is necessary to allow accurate prediction of particulate emissions to inform regulatory decisions and for use in modeling predictions.
Implications: Development of region-specific emission estimation techniques for PM10 and PM2.5 from open-cut coal mines is necessary to allow accurate prediction of particulate emissions to inform regulatory decisions and for use in modeling predictions. Comprehensive air quality monitoring was undertaken, and corresponding recommendations were provided. 相似文献
66.
Effects of Forest Management Practices on Mid-Atlantic Streams 总被引:1,自引:0,他引:1
Kent W. Thornton Shannon P. Holbrook Kenneth L. Stolte Ronald B. Landy 《Environmental monitoring and assessment》2000,63(1):31-41
Agricultural and urban land use activities have affected stream ecosystems throughout the mid-Atlantic region. However, over 60% of the mid-Atlantic region is forested. A study was conducted to investigate the effects of management practices on forested stream ecosystems throughout the mid-Atlantic region. The study consisted of two phases: Phase 1 was a literature synthesis of information available on the effects of forest management practices on stream hydrology, erosion and sedimentation, riparian habitat alteration, chemical addition, and change in biotic diversity in the mid-Atlantic region. In Phase 2, data from mid-Atlantic streams were analyzed to assess the effects of forest land use on stream quality at the regional scale. Typically, it is the larger order streams in which monitoring and assessment occurs—3rd order or higher streams. The impacts of forest management practices, particularly hydrologic modifications and riparian buffer zone alteration, occur predominantly in first and second order streams with cumulative impacts translating to higher order streams. Based on the literature review and mid-Atlantic Highland streams analysis, there are short-term (e.g., 2 to 5 years) effects of forest management practices on stream quality at local scales. However, signatures of cumulative effects from forest management practices are not apparent at regional scales in the Highlands. In general, forested land use is associated with good stream quality in the region compared with other land use practices. 相似文献
67.
Conservation Implications of Dietary Dilution from Debris Ingestion: Sublethal Effects in Post-Hatchling Loggerhead Sea Turtles 总被引:1,自引:0,他引:1
Abstract: Ingestion of anthropogenic debris by marine species has been documented extensively; fewer studies have attempted to quantify the sublethal effects caused by debris ingestion. One potential sublethal effect is reduced nutrient gains from diets diluted by consumption of debris. Post-hatchling and juvenile loggerhead sea turtles ( Caretta caretta ) consume substantial quantities of debris. We evaluated the effects of dietary dilution on voluntary intake in post-hatchling loggerheads to assess their ability to compensate for the presence of inert diluents in their diet by increasing dry mass intakes to maintain nutrient gains. Mean daily intakes of dry mass did not increase significantly with dietary dilution, so intakes of energy and nitrogen on a 50% dilution diet were significantly lower than on a 10% dilution diet. Therefore, post-hatchling loggerheads have an extremely limited ability to compensate for dietary dilution and would experience sublethal effects from decreased energy and nitrogen gains on dilute diets. Decreased nutrient intakes have serious conservation implications because of possible decreased growth rates, longer developmental periods at sizes most vulnerable to predation, depleted energy reserves, reduced reproductive output, and decreased survivorship. 相似文献
68.
Linnea I. Laestadius Roni A. Neff Colleen L. Barry Shannon Frattaroli 《Environmental Communication: A Journal of Nature and Culture》2016,10(1):84-103
This paper examines the factors shaping non-governmental organization (NGO) messaging decisions on how meat consumption should be altered in light of climate change. In particular, we sought to understand the relative absence of messages promoting meat-free diets and the decision of some NGOs to pair meat reduction messages with messages encouraging consumers to switch to meat from ruminant grass-fed animals. Interviews were conducted with 27 staff members from environmental, food-focused, and animal protection NGOs from the USA, Canada, and Sweden. While strategic considerations consistently led to the use of modest messages for meat reduction, NGO missions were also key to shaping the specifics of messaging goals. The relatively low personal comfort levels that some NGO staffers held toward meat-free diets also led to the use of more modest requests for meat reduction. Findings highlight the complex nature of the factors underlying the environmental communication messages of NGOs. 相似文献
69.
70.
Strobl RO Robillard PD Shannon RD Day RL McDonnell AJ 《Environmental monitoring and assessment》2006,112(1-3):137-158
The principal instrument to temporally and spatially manage water resources is a water quality monitoring network. However,
to date in most cases, there is a clear absence of a concise strategy or methodology for designing monitoring networks, especially
when deciding upon the placement of sampling stations. Since water quality monitoring networks can be quite costly, it is
very important to properly design the monitoring network so that maximum information extraction can be accomplished, which
in turn is vital when informing decision-makers. This paper presents the development of a methodology for identifying the
critical sampling locations within a watershed. Hence, it embodies the spatial component in the design of a water quality
monitoring network by designating the critical stream locations that should ideally be sampled. For illustration purposes,
the methodology focuses on a single contaminant, namely total phosphorus, and is applicable to small, upland, predominantly
agricultural-forested watersheds. It takes a number of hydrologic, topographic, soils, vegetative, and land use factors into
account. In addition, it includes an economic as well as logistical component in order to approximate the number of sampling
points required for a given budget and to only consider the logistically accessible stream reaches in the analysis, respectively.
The methodology utilizes a geographic information system (GIS), hydrologic simulation model, and fuzzy logic. 相似文献