全文获取类型
收费全文 | 221篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 8篇 |
废物处理 | 9篇 |
环保管理 | 39篇 |
综合类 | 25篇 |
基础理论 | 44篇 |
污染及防治 | 72篇 |
评价与监测 | 20篇 |
社会与环境 | 11篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 13篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 17篇 |
2016年 | 7篇 |
2015年 | 12篇 |
2014年 | 11篇 |
2013年 | 20篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 7篇 |
2009年 | 11篇 |
2008年 | 14篇 |
2007年 | 12篇 |
2006年 | 15篇 |
2005年 | 3篇 |
2004年 | 10篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1995年 | 5篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1983年 | 2篇 |
1958年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有230条查询结果,搜索用时 15 毫秒
61.
62.
Accuracy Assessment of NOAA Gridded Daily Reference Evapotranspiration for the Texas High Plains 下载免费PDF全文
Jerry Moorhead Prasanna Gowda Mike Hobbins Gabriel Senay George Paul Thomas Marek Dana Porter 《Journal of the American Water Resources Association》2015,51(5):1262-1271
The National Oceanic and Atmospheric Administration (NOAA) provides daily reference evapotranspiration (ETref) maps for the contiguous United States using climatic data from North American Land Data Assimilation System (NLDAS). This data provides large‐scale spatial representation of ETref, which is essential for regional scale water resources management. Data used in the development of NOAA daily ETref maps are derived from observations over surfaces that are different from short (grass — ETos) or tall (alfalfa — ETrs) reference crops, often in nonagricultural settings, which carries an unknown discrepancy between assumed and actual conditions. In this study, NOAA daily ETos and ETrs maps were evaluated for accuracy, using observed data from the Texas High Plains Evapotranspiration (TXHPET) network. Daily ETos, ETrs and the climatic data (air temperature, wind speed, and solar radiation) used for calculating ETref were extracted from the NOAA maps for TXHPET locations and compared against ground measurements on reference grass surfaces. NOAA ETref maps generally overestimated the TXHPET observations (1.4 and 2.2 mm/day ETos and ETrs, respectively), which may be attributed to errors in the NLDAS modeled air temperature and wind speed, to which reference ETref is most sensitive. Therefore, a bias correction to NLDAS modeled air temperature and wind speed data, or adjustment to the resulting NOAA ETref, may be needed to improve the accuracy of NOAA ETref maps. 相似文献
63.
Yang K Xu Q Townsend TG Chadik P Bitton G Booth M 《Journal of the Air & Waste Management Association (1995)》2006,56(8):1130-1138
Hydrogen sulfide (H2S) generation in construction and demolition (C&D) debris landfills has been associated with the biodegradation of gypsum drywall. Laboratory research was conducted to observe H2S generation when drywall was codisposed with different C&D debris constituents. Two experiments were conducted using simulated landfill columns. Experiment 1 consisted of various combinations of drywall, wood, and concrete to determine the impact of different waste constituents and combinations on H2S generation. Experiment 2 was designed to examine the effect of concrete on H2S generation and migration. The results indicate that decaying drywall, even alone, leached enough sulfate ions and organic matter for sulfate-reducing bacteria (SRB) to generate large H2S concentrations as high as 63,000 ppmv. The codisposed wastes show some effect on H2S generation. At the end of experiment 1, the wood/drywall and drywall alone columns possessed H2S concentrations > 40,000 ppmv. Conversely, H2S concentrations were < 1 ppmv in those columns containing concrete. Concrete plays a role in decreasing H2S by increasing pH out of the range for SRB growth and by reacting with H2S. This study also showed that wood lowered H2S concentrations initially by decreasing leachate pH values. Based on the results, two possible control mechanisms to mitigate H2S generation in C&D debris landfills are suggested. 相似文献
64.
65.
The effects of environmental overload and noise on helping behavior is assessed through a 2 × 3 experimental design including two levels of environmental overload and three conditions on each site: without roadworks, roadworks without noise, and noisy roadworks.Results are analysed in terms of the cognitive appraisal of the situation and the narrowing of attention. The subject's behavior when confronted with explicit and implicit helping requests shows that noise appears to be the most important component of overload, affecting both the subjects' attentiveness in implicit helping demands, as well as the refusal to engage in verbal interaction. 相似文献
66.
Lee S Xu Q Booth M Townsend TG Chadik P Bitton G 《Waste management (New York, N.Y.)》2006,26(5):526-533
The biological conversion of sulfate from disposed gypsum drywall to hydrogen sulfide (H(2)S) in the anaerobic environment of a landfill results in odor problems and possible health concerns at many disposal facilities. To examine the extent and magnitude of such emissions, landfill gas samples from wells, soil vapor samples from the interface of the waste and cover soil, and ambient air samples, were collected from 10 construction and demolition (C&D) debris landfills in Florida and analyzed for H(2)S and other reduced sulfur compounds (RSC). H(2)S was detected in the well gas and soil vapor at all 10 sites. The concentrations in the ambient air above the surface of the landfill were much lower than those observed in the soil vapor, and no direct correlation was observed between the two sampling locations. Methyl mercaptan and carbonyl sulfide were the most frequently observed other RSC, though they occurred at smaller concentrations than H(2)S. This research confirmed the presence of H(2)S at C&D debris landfills. High concentrations of H(2)S may be a concern for employees working on the landfill site. These results indicate that workers should use proper personal protection at C&D debris landfills when involved in excavation, landfill gas collection, or confined spaces. The results indicate that H(2)S is sufficiently diluted in the atmosphere to not commonly pose acute health impacts for these landfill workers in normal working conditions. H(2)S concentrations were extremely variable with measurements occurring over a very large range (from less than 3 ppbv to 12,000 ppmv in the soil vapor and from less than 3 ppbv to 50 ppmv in ambient air). Possible reasons for the large intra- and inter-site variability observed include waste and soil heterogeneities, impact of weather conditions, and different site management practices. 相似文献
67.
Gabriel Jácome Carla Valarezo Changkyoo Yoo 《Environmental monitoring and assessment》2018,190(4):259
Pollution and the eutrophication process are increasing in lake Yahuarcocha and constant water quality monitoring is essential for a better understanding of the patterns occurring in this ecosystem. In this study, key sensor locations were determined using spatial and temporal analyses combined with geographical information systems (GIS) to assess the influence of weather features, anthropogenic activities, and other non-point pollution sources. A water quality monitoring network was established to obtain data on 14 physicochemical and microbiological parameters at each of seven sample sites over a period of 13 months. A spatial and temporal statistical approach using pattern recognition techniques, such as cluster analysis (CA) and discriminant analysis (DA), was employed to classify and identify the most important water quality parameters in the lake. The original monitoring network was reduced to four optimal sensor locations based on a fuzzy overlay of the interpolations of concentration variations of the most important parameters. 相似文献
68.
Gavin McDonald Molly Wilson Diogo Veríssimo Rebecca Twohey Michaela Clemence Dean Apistar Stephen Box Paul Butler Fel Cesar Cadiz Stuart J. Campbell Courtney Cox Micah Effron Steve Gaines Raymond Jakub Roquelito H. Mancao Pablo T. Rojas Rocky Sanchez Tirona Gabriel Vianna 《Conservation biology》2020,34(5):1176-1189
Small-scale fisheries are an important livelihood and primary protein source for coastal communities in many of the poorest regions in the world, yet many are overfished and thus require effective and scalable management solutions. Positive ecological and socioeconomic responses to management typically lag behind immediate costs borne by fishers from fishing pressure reductions necessary for fisheries recovery. These short-term costs challenge the long-term success of these interventions. However, social marketing may increase perceptions of management benefits before ecological and socioeconomic benefits are fully realized, driving new social norms and ultimately long-term sustainable behavior change. By conducting underwater visual surveys to quantify ecological conditions and by conducting household surveys with community members to quantify their perceptions of management support and socioeconomic conditions, we assessed the impact of a standardized small-scale fisheries management intervention that was implemented across 41 sites in Brazil, Indonesia, and the Philippines. The intervention combines TURF reserves (community-based territorial use rights for fishing coupled with no-take marine reserves) with locally tailored social-marketing behavior change campaigns. Leveraging data across 22 indicators and 4 survey types, along with data from 3 control sites, we found that ecological and socioeconomic impacts varied and that communities supported the intervention and were already changing their fishing practices. These results suggest that communities were developing new social norms and fishing more sustainably before long-term ecological and socioeconomic benefits of fisheries management materialized. 相似文献
69.
Bycatch of turtles in passive inland fyke net fisheries has been poorly studied, yet bycatch is an important conservation issue given the decline in many freshwater turtle populations. Delayed maturity and low natural adult mortality make turtles particularly susceptible to population declines when faced with additional anthropogenic adult mortality such as bycatch. When turtles are captured in fyke nets, the prolonged submergence can lead to stress and subsequent drowning. Fish die within infrequently checked passive fishing nets and dead fish are a potential food source for many freshwater turtles. Dead fish could thus act as attractants and increase turtle captures in fishing nets. We investigated the attraction of turtles to decomposing fish within fyke nets in eastern Ontario. We set fyke nets with either 1 kg of one-day or five-day decomposed fish, or no decomposed fish in the cod-end of the net. Decomposing fish did not alter the capture rate of turtles or fish, nor did it alter the species composition of the catch. Thus, reducing fish mortality in nets using shorter soak times is unlikely to alter turtle bycatch rates since turtles were not attracted by the dead fish. Interestingly, turtle bycatch rates increased as water temperatures did. Water temperature also influences turtle mortality by affecting the duration turtles can remain submerged. We thus suggest that submerged nets to either not be set or have reduced soak times in warm water conditions (e.g., >20 °C) as turtles tend to be captured more frequently and cannot withstand prolonged submergence. 相似文献
70.
Several studies have identified a significant relationship between trust in regulatory institutions and the extent of a hazard’s acceptability. Many, however, have overlooked the potential impact perceived risk and perceived benefit may have on the relationship. Our principal goal is to assess empirically the link between social trust in regulatory entities and the degree of public acceptability of hazards in view of interactions among social trust, perceived risk, perceived benefit and public acceptability. A survey was conducted in 2006 in three cities representative of central Mexico. A total of 356 participants answered the survey. Each participant assessed 30 hazards for perceived risk, perceived benefit, acceptability, social trust in regulatory entities, and personal knowledge. Our main finding was that social trust retained a direct as well as an indirect causal link with the degree of a hazard’s public acceptability, independent of hazard, the extent of knowledge, and the magnitude of the hazard’s perceived risk and benefit. The relationship encountered between perceived risk and acceptability was unexpected, as numerous studies have demonstrated empirically the influence perceived risk on how acceptable an activity or technology is. In our results the statistical significance of the perceived risk-acceptability relationship practically disappeared when controlled for institutional trust and perceived benefit. In other words, the net linear relationship between perceived risk and acceptability is mediated by the extent of social trust and the benefit perceived. Comparisons with several prior studies are conducted, and implications for regulatory entities are discussed. 相似文献