全文获取类型
收费全文 | 140篇 |
免费 | 5篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 26篇 |
环保管理 | 42篇 |
综合类 | 39篇 |
基础理论 | 16篇 |
污染及防治 | 7篇 |
评价与监测 | 9篇 |
社会与环境 | 5篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 2篇 |
2021年 | 3篇 |
2020年 | 5篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 5篇 |
2013年 | 10篇 |
2012年 | 3篇 |
2011年 | 8篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 8篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 10篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 1篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1980年 | 1篇 |
排序方式: 共有148条查询结果,搜索用时 0 毫秒
41.
分析了节流降压小孔喷注复合消声器的消声原理和设计方法,并结合瓦斯排放设计了复合消声器,进行了工业应用,经测试取得了理想的降噪效果。 相似文献
42.
43.
44.
Pitkänen T Karinen P Miettinen IT Lettojärvi H Heikkilä A Maunula R Aula V Kuronen H Vepsäläinen A Nousiainen LL Pelkonen S Heinonen-Tanski H 《Ambio》2011,40(4):377-390
The raw water quality and associations between the factors considered as threats to water safety were studied in 20 groundwater supplies in central Finland in 2002-2004. Faecal contaminations indicated by the appearance of Escherichia coli or intestinal enterococci were present in five small community water supplies, all these managed by local water cooperatives. Elevated concentrations of nutrients in raw water were linked with the presence of faecal bacteria. The presence of on-site technical hazards to water safety, such as inadequate well construction and maintenance enabling surface water to enter into the well and the insufficient depth of protective soil layers above the groundwater table, showed the vulnerability of the quality of groundwater used for drinking purposes. To minimize the risk of waterborne illnesses, the vulnerable water supplies need to be identified and appropriate prevention measures such as disinfection should be applied. 相似文献
45.
Introduction: This study addressed relative injury risk among Norwegian farmers, who are mostly self-employed and run small farm enterprises. The aim was to explore the relative importance of individual, enterprise, and work environment risks for occupational injury and to discuss the latent conditions for injuries using sociotechnical system theory. Method: Injury report and risk factors were collected through a survey among Norwegian farm owners in November 2012. The response rate was 40% (n = 2,967). Annual work hours were used to calculate injury rates within groups. Poisson regression using the log of hours worked as the offset variable allowed for the modeling of adjusted rate ratios for variables predictive of injury risk. Finally, safety climate measures were introduced to assess potential moderating effects on risk. Results: Results showed that the most important risk factors for injuries were the design of the workplace, type of production, and off-farm work hours. The main results remained unchanged when adding safety climate measures, but the measures moderated the injury risk for categories of predominant production and increased the risk for farmers working with family members and/or employees. An overall finding is how the risk factors were interrelated. Conclusions: The study identified large structural diversities within and between groups of farmers. The study drew attention to operating conditions rather than individual characteristics. The farmer’s role (managerial responsibility) versus regulation and safety climate is important for discussions of injury risk. Practical Applications: We need to study sub-groups to understand how regulation and structural changes affect work conditions and management within different work systems, conditioned by production. It is important to encourage actors in the political-economic system to become involved in issues that were found to affect the safety of farmers. 相似文献
46.
47.
In this case study of a degraded tropical landscape, we examine how the protected area system in Hong Kong, China, should be modified to improve its efficiency in protecting the surprisingly rich biota. The challenge lies in the fine scale of site selection, and the absence of a core area with high species richness and rarity. Site selection was first conducted in 1 km grid units by selecting hotspots and irreplaceable sites using field records for eight groups of species (amphibians, reptiles, mammals, breeding birds, ants, butterflies, dragonflies and rare vascular plants). The habitats of conservation value within the selected grid units were then delineated on the basis of expert knowledge. Recommendations for increasing the total existing protected area by 6% (i.e. an additional 2% of Hong Kong's total land area) were submitted to the Government in August 2000. To test the robustness of the results, site selection was repeated in 2001 using updated data and different selection methods. The numbers of squares selected by complementarity-based algorithms were similar to those by the hotspots and irreplaceable site method. Sites selected for rare species were very sensitive to data completeness, implying that the application of complementarity-based algorithms at fine scales might be limited. 相似文献
48.
Environmental Vulnerability Indicators for Environmental Planning and Decision-Making: Guidelines and Applications 总被引:6,自引:0,他引:6
Environmental decision-making and policy-making at all levels refers necessarily to synthetic, approximate quantification
of environmental properties such as vulnerability, conservation status, and ability to recover after perturbation. Knowledge
of such properties is essential to informed decision-making, but their definition is controversial and their precise characterization
requires investments in research, modeling, and data collection that are only possible in the most developed countries. Environmental
agencies and governments worldwide have increasingly requested numerical quantification or semiquantitative ranking of such
attributes at the ecosystem, landscape, and country level. We do not have a theory to guide their calculation, in general
or specific contexts, particularly with the amount of resources usually available in such cases. As a result, these measures
are often calculated with little scientific justification and high subjectivity, and such doubtful approximations are used
for critical decision-making. This problem applies particularly to countries with weak economies, such as small island states,
where the most precious environmental resources are often concentrated.
This paper discusses frameworks for a “least disappointing,” approximate quantification of environmental vulnerability. After
a review of recent research and recent attempts to quantify environmental vulnerability, we discuss models and theoretical
frameworks for obtaining an approximate, standardizable vulnerability indicator of minimal subjectivity and maximum generality.
We also discuss issues of empirical testing and comparability between indicators developed for different environments. To
assess the state of the art, we describe an independent ongoing project developed in the South Pacific area and aimed to the
comparative evaluation of the vulnerability of arbitrary countries. 相似文献
49.
B. Patti A. Bonanno G. Basilone S. Goncharov S. Mazzola G. Buscaino A. Cuttitta J. Garcí a Lafuente A. Garcí a V. Palumbo G. Cosimi 《Chemistry and Ecology》2004,20(5):365-375
The main results of research work carried out since 1998 with regard to the application of hydro-acoustic technologies for the evaluation of biomass and distribution of small pelagic fish species off the southern coast of Sicily are presented, taking into account information from hydrology and from ecology of the fish populations targeted. The biomass estimates and the population-density charts presented concern the two main species, i.e. sardine Sardina pilchardus (Walbaum, 1792) and anchovy Engraulis encrasicolus (Linnaeus, 1758). Both the sardine and anchovy populations experienced large inter-annual fluctuations, with biomass estimates ranging from 6000 to over 36,000 tonnes (t) (sardine) and from about 7000 to 23,000 t (anchovy). Acoustic estimates are largely consistent with landings recorded in Sciacca (the main fishing port for small pelagic species in the study area) during the year following the evaluation surveys. In addition, trends in sardine and anchovy biomass estimates appears to be negatively correlated with the mean sea surface temperature calculated over the time intervals January-September (sardine) and June-November (anchovy) of the preceding year, which correspond to larval and juvenile growth periods of target species. Observed patterns would suggest the importance of enrichment processes relevant to the survival of early stages, so determining recruitment success and finally higher population sizes. 相似文献
50.
This paper proposes a novel approach to measuring the progress of small island developing states (SIDS) towards sustainable development (SD) as set by the UN Sustainable Development Goals 2030. Currently, these goals do not provide adequate guidance on how countries might measure their progress towards sustainability. We use these goals and a subset of their targets to develop an index with concrete targets, through the use of pertinent sustainability indicators, that SIDS should aim to achieve a sustainable society. In addition to the three categorical pillars of SD (social, economic and environmental), we included the category Climate Change and Disaster Management (incorporating Disaster Risk Reduction). The basis of our decision is that the UN and the Intergovernmental Panel on Climate Change have both recognized the vulnerability of SIDS to both environmental hazards. Our index scores a total 70 individual indicators for the four categories to track the progress of a SIDS towards a sustainable society. Using the Caribbean nation, Republic of Trinidad and Tobago, as our SIDS case study, we report the average of the scores for each category to illustrate its progress towards sustainability. Overall Trinidad and Tobago is slowly progressing towards a more sustainably developed society. Our results show that the nation is only moderately successful regarding progress in three traditional pillars of SD, social, economic and environmental. However, Trinidad and Tobago scores poorly in the Climate Change and Disaster Management category and needs to improve in this area especially due to its vulnerability. 相似文献