全文获取类型
收费全文 | 454篇 |
免费 | 8篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 11篇 |
环保管理 | 92篇 |
综合类 | 57篇 |
基础理论 | 132篇 |
污染及防治 | 103篇 |
评价与监测 | 20篇 |
社会与环境 | 15篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 12篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 7篇 |
2016年 | 10篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 38篇 |
2012年 | 13篇 |
2011年 | 16篇 |
2010年 | 17篇 |
2009年 | 12篇 |
2008年 | 13篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 17篇 |
2004年 | 9篇 |
2003年 | 13篇 |
2002年 | 12篇 |
2001年 | 27篇 |
2000年 | 12篇 |
1999年 | 14篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 7篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1974年 | 2篇 |
1973年 | 4篇 |
1967年 | 2篇 |
排序方式: 共有466条查询结果,搜索用时 15 毫秒
181.
In the UK, all local authorities have been set statutory performance standards for the recycling and composting of household waste. As part of their strategy for achieving these standards, Lancashire County Council (LCC) has made a number of alterations to the layout and facilities available at civic amenity sites (renamed Household Waste Recycling Centres (HWRCs)) in the county and tried to create a more positive image of the sites for members of the public. This study consisted of two surveys carried out in order to establish how to maximise household waste recycling at the 26 HWRCs in Lancashire. A telephone survey was carried out amongst all Lancashire's HWRC attendants in order to establish the effects of recent site improvements and to provide an indication of overall customer satisfaction. An on-site questionnaire survey was conducted amongst HWRC customers on five selected sites, over three separate seasons, incorporating comparative weekend and weekday surveys at each site. This survey investigated public opinion of HWRCs in Lancashire, as well as exploring effective methods that would assist customers in maximising the amount of recycling at HWRCs. The attendants' survey revealed that site attendants were actively encouraging customers to segregate waste more efficiently at the HWRCs, and that a recycling-related bonus scheme had provided an incentive towards this effort. Site attendants have a key role in educating the public about waste segregation and the effective use of HWRCs. Lancashire HWRC users were mostly male, used private cars to transport waste and showed high levels of customer satisfaction. Practical changes to encourage more recycling at HWRCs were clearly identified in the customers' survey; these include longer opening hours and the provision of boxes to enable pre-separation of waste. The study has clearly shown how the results of user surveys can provide practical assistance in the development of improved sustainable waste management strategies. 相似文献
182.
183.
The J-value technique allows an objective determination to be made of the resources that should be applied cost effectively to improve heath and safety. This is essential if capabilities are to be employed optimally and risks reduced in a way that reflects their severity. Although other considerations such as good practice and socio-political influences may affect a final decision on the resources to be sanctioned, the incorporation of these additional factors should be made transparent if the decision is no longer to be based on cost effectiveness. The J-value provides an objective criterion by which to judge when “reasonable practicability” has been achieved in committing resources for safety improvement, which is the legal requirement under health and safety law in the UK.Moreover, the J-value methodology also allows other related issues to be addressed objectively. Regulatory bodies apply different limits for workers and the general public, with higher risks being permitted for workers. Although a factor of about 10 has been used in several contexts, no objective rationale has been developed for this particular figure until now. However, it is shown that application of the J-value analysis can provide a justification for a ratio of workers’ risk to public risk of approximately this size if certain reasonable assumptions are made. Thus the paper provides the first quantitative explanation for the different levels of protection demanded by regulators nationally and internationally for workers and public. 相似文献
184.
Self‐awareness represents an important aspect of leadership. However, past research on leader self‐awareness has focused on one component of self‐awareness, self versus others' ratings, leaving the second component, the ability to anticipate the views of others, largely neglected. We examined this second component of self‐awareness by focusing on women leaders who have been found to under‐predict how others rate them. In two studies, we measured how women leaders anticipate the views of their bosses in regard to their leadership. In Study 1, 194 leaders rated their leadership, were rated by their bosses, and then predicted how their bosses rated their leadership. While we found that women under‐predict their boss ratings compared with men, we did not find that boss gender or feedback played a role in this under‐prediction. In Study 2, 76 female leaders identified (via open‐ended questions) possible reasons and consequences of under‐prediction for women in organizations. Results from Study 2 reveal the following: (1) the reasons for women's under‐prediction include a lack of self‐confidence, differences in feedback needs, learned gender roles, and self‐sexism; and (2) the perceived consequences of under‐prediction are negative for both women and the organization. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
185.
Hassan FM Taylor WD Al-Taee MM Al-Fatlawi HJ 《Journal of environmental biology / Academy of Environmental Biology, India》2010,31(3):343-350
Seasonal variations in phytoplankton abundance and their composition were studied at five stations in the middle region (between Al-Hindiya barrage to Kifil City) of the Euphrates River in Iraq between March, 2004, and February, 2005. A total 151 taxa of phytoplankton were identified, belonging to Bacillariophyceae (98), Chlorophyceae (33), Cyanophyceae (14), Euglenophyceae (2), Xanthophyceae (2), and Dinophyceae (2). The total abundance of phytoplankton cells varied from 136 to 5312 cells l(-1) with maxima in spring and fall. Bacillariophyceae were the most abundant group at all stations. Some species of phytoplankton occurred continuously during the study period (Cyclotella ocellata, C. meneghiana, Cocconeis placentula, Nitzchia spp, Meringosphaera spinosa). The study recorded four species as new records for Iraqi. The phytoplankton was indicative of oligotrophic conditions although it showed some signs of organic pollution near cities. 相似文献
186.
The breeding performance of higher predators has often been used to monitor fluctuations in the abundance of important prey
stocks in marine ecosystems. The development of electronic data-loggers in recent years has also provided the opportunity
of using wide-ranging marine animals to measure physical oceanographic conditions. In this study, time–depth recorders (TDRs)
programmed to record temperature were deployed on female Antarctic fur seals (Arctocephalus gazella) at Bird Island, South Georgia (54°00′S; 38°02′W) during the breeding seasons 1994 to 1998. Temperature sensors had relatively
slow response times, and thermal radiation errors occurred during the day when seals spent a large proportion of their time
at the surface. Nevertheless, measurements provided temperature–depth profiles which were typical of the vertical stratification
of the ocean. During the early stages of a foraging trip temperature increased, suggesting that fur seals travelled northwards
from South Georgia towards the warmer waters of the Polar Front. In addition, higher temperatures were recorded by females
that remained at sea for longer, implying that these individuals also travelled further. Mean sea-surface temperature (SST)
increased from ∼1 to 4 °C from December to March and agreed with SSTs from ship, buoy and satellite. Future studies on marine
mammals which combine satellite tracking with oceanographic measurements are likely to provide valuable information on biophysical
aspects of the ocean.
Received: 16 June 1998 / Accepted: 13 February 1999 相似文献
187.
Predicting changes in the Antarctic krill, Euphausia superba, population at South Georgia 总被引:1,自引:0,他引:1
Variability in the Southern Ocean is frequently reflected in changes in the abundance of Antarctic krill Euphausia superba and subsequent effects on dependent predators. However, the nature and consequences of changes in krill population dynamics
that accompany fluctuations in its abundance are essentially unknown. A conceptual model, developed from quantitative measures
of krill length in the diet of predators at South Georgia from 1991 to 1997, allowed predictions to be made about the abundance
and population structure of krill in 1998 and the consequences for predators. Consistent with model predictions, in 1998 there
was a serial change in krill population structure, low krill biomass and low reproductive performance of predators. The change
in the modal size of krill, from 56 mm in December to 42 mm in March, was apparently a result of the transport of krill into
the region. This is the first occasion when the future status and structure of the krill population at South Georgia has been
successfully predicted. By representing local krill population dynamics, which may also reflect large-scale physical and biological
processes, predators have a potential key role as indicators of environmental variation in the Southern Ocean at a range of
spatial scales.
Received: 6 March 1999 / Accepted: 3 September 1999 相似文献
188.
A Framework for Evaluating the Effects of Human Factors on Wildlife Habitat: the Case of Giant Pandas 总被引:10,自引:0,他引:10
Jianguo Liu ‡ Zhiyun Ouyang † William W. Taylor Richard Groop § Yingchun Tan and Heming Zhang 《Conservation biology》1999,13(6):1360-1370
Abstract: To address the complex interactions between humans and wildlife habitat, we developed a conceptual framework that links human factors with forested landscapes and wildlife habitat. All the components in the framework are integrated into systems models that analyze the effects of human factors and project how wildlife habitat would change under different policy scenarios. As a case study, we applied this framework to the Wolong Nature Reserve in Sichuan Province (southwestern China), the largest home of the giant panda ( Ailuropoda melanoleuca ). We collected ecological and socioeconomic data with a combination of various methods ( field observations, aerial photographs, government documents and statistics, interviews, and household surveys) and employed geographic information systems and systems modeling to analyze and integrate the data sources. Human population size has increased by 66% and the number of households in the reserve has increased by 115% since 1975, when the reserve was established. During the same period, the quality and quantity of the giant panda habitat dramatically decreased because of increasing human activities such as fuelwood collection. Systems modeling predicted that under the status quo, human population in the reserve would continue to grow and cause more destruction of the remaining panda habitat, whereas reducing human birth rates and increasing human emigration rates would lower human population size and alleviate human impacts on the panda habitat. Furthermore, our simulations and surveys suggested that policies encouraging the emigration of young people would be more effective and feasible than relocating older people in reducing human population size and conserving giant panda habitat in the reserve. 相似文献
189.
Global Perspectives on Pollination Disruptions 总被引:2,自引:0,他引:2
190.
O C Taylor 《Journal of the Air Pollution Control Association》1969,19(5):347-351