全文获取类型
收费全文 | 278篇 |
免费 | 1篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 16篇 |
环保管理 | 23篇 |
综合类 | 37篇 |
基础理论 | 59篇 |
污染及防治 | 95篇 |
评价与监测 | 34篇 |
社会与环境 | 14篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 8篇 |
2022年 | 21篇 |
2021年 | 14篇 |
2020年 | 17篇 |
2019年 | 5篇 |
2018年 | 13篇 |
2017年 | 24篇 |
2016年 | 19篇 |
2015年 | 10篇 |
2014年 | 26篇 |
2013年 | 25篇 |
2012年 | 8篇 |
2011年 | 14篇 |
2010年 | 8篇 |
2009年 | 11篇 |
2008年 | 14篇 |
2007年 | 10篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1988年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有285条查询结果,搜索用时 31 毫秒
41.
Structural change and sustainable development 总被引:3,自引:0,他引:3
Ramn E. Lpez Gustavo Anríquez Sumeet Gulati 《Journal of Environmental Economics and Management》2007,53(3):307-322
In this paper, we show that the commonly observed decline in primary (natural resource using) sector output and employment shares, often termed structural change, can be explained as an endogenous response to the presence of nature's constraint. Structural change takes place even if consumer preferences are homothetic, and technological progress does not discriminate against the primary sector. Under certain conditions, structural change allows an open economy to grow with natural resource sustainability. Sustained and environmentally sustainable economic growth is possible even if the natural resource is exploited under open access. Well-defined property rights are neither necessary, nor sufficient for sustainable growth. We show that there is no unique relationship between natural resource endowment and the rate of economic growth over the long run. Resource-rich economies may grow faster or slower than resource-poor ones. 相似文献
42.
Euglena gracilis as a model for the study of Cu and Zn toxicity and accumulation in eukaryotic cells
Marcelo Einicker-Lamas Gustavo Antunes Mezian Thiago Benevides Fernandes Fabio Leandro S. Silva Flvio Guerra Kildare Miranda Marcia Attias Mecia M. Oliveira 《Environmental pollution (Barking, Essex : 1987)》2002,120(3)
We have observed the effect of copper and zinc on the biology of Euglena gracilis. The cells displayed different sensitivities to these metals, as the apparent LC50 for Cu2+ was 0.22 mM, and for Zn2+ it was 0.88 mM. While Zn2+ was able to increase cell proliferation even at 0.1 mM, the minimal CuCl2 concentration tested (0.02 mM) was sufficient to impair cell division. Higher concentrations of these metals not only inhibited cell division in a concentration-dependent manner, but also interfered with the metabolism of E. gracilis. A higher accumulation of proteins and lipids per cell was observed at the DI50 concentration for metal-treated cells. These results suggest that the test concentration of both metals leads to a failure in completing cell division. Ultrastructural analysis indicated a chloroplast disorganization in copper-treated cells, as well as the presence of electron dense granules with different shapes and sizes inside vacuoles. Microanalysis of these granules indicated an accumulation of copper, thus suggesting a detoxification role played by the vacuoles. These results indicate that E. gracilis is an efficient biological model for the study of metal poisoning in eukaryotic cells. They also indicate that copper and zinc (copper being more poisonous) had an overall toxic effect on E. gracilis and that part of the effect can be ascribed to defects in the structure of chloroplast membranes. 相似文献
43.
44.
Conservation practitioners, natural resource managers, and environmental stewards often seek out scientific contributions to inform decision-making. This body of science only becomes actionable when motivated by decision makers considering alternative courses of action. Many in the science community equate addressing stakeholder science needs with delivering actionable science. However, not all efforts to address science needs deliver actionable science, suggesting that the synonymous use of these two constructs (delivering actionable science and addressing science needs) is not trivial. This can be the case when such needs are conveyed by people who neglect decision makers responsible for articulating a priority management concern and for specifying how the anticipated scientific information will aid the decision-making process. We argue that the actors responsible for articulating these science needs and the process used to identify them are decisive factors in the ability to deliver actionable science, stressing the importance of examining the provenance and the determination of science needs. Guided by a desire to enhance communication and cross-literacy between scientists and decision makers, we identified categories of actors who may inappropriately declare science needs (e.g., applied scientists with and without regulatory affiliation, external influencers, reluctant decision makers, agents in place of decision makers, and boundary organization representatives). We also emphasize the importance of, and general approach to, undertaking needs assessments or gap analyses as a means to identify priority science needs. We conclude that basic stipulations to legitimize actionable science, such as the declaration of decisions of interest that motivate science needs and using a robust process to identify priority information gaps, are not always satisfied and require verification. To alleviate these shortcomings, we formulated practical suggestions for consideration by applied scientists, decision makers, research funding entities, and boundary organizations to help foster conditions that lead to science output being truly actionable. 相似文献
45.
46.
L.A. Sarubbo R.B. Rocha Jr J.M. Luna R.D. Rufino V.A. Santos I.M. Banat 《Chemistry and Ecology》2013,29(8):707-723
Contamination by heavy metals is the result of different industrial activities. The presence of heavy metals in soil and water causes serious problems, as these materials are not biodegradable and do contaminate both biological systems and the subsoil. Biological surface-active compounds otherwise known as biosurfactants in general and rhamnolipids biosurfactants in particular have been successfully employed in the remediation of environments contaminated with heavy metal ions. The aim of the present review is to highlight potential applications of these tensioactive compounds for use in environmental heavy metals removal and bioremediation and processes involved. 相似文献
47.
The most recent intervention on the coastline of Espinho, located on the Portuguese West Atlantic coast, was part of the General
Plan for Coastal Protection in 1980/81. As a result, two unusually large groins/headlands were built which were reinforced
and enlarged in 1997, slightly changing their geometry and orientation. However, due to the decreased sediment supply from
the north and the impact of energetic sea conditions common to the northwest coast of Portugal the coastal evolution has not
developed as desired, although in general terms the initial expectations were fulfilled. The numerical modelling of the Espinho
coastline using SMC software focused on both hydrodynamic and hydromorphological aspects. The purpose of this study is to
analyse the most vulnerable areas of the Espinho seafront for current velocities and littoral drift, as well as to confirm
the effectiveness of the two groins in terms of coastal protection. To achieve this, various simulations were performed, taking
into account diverse sea conditions. 相似文献
48.
The management of small-scale freshwater fisheries in Amazon has been based usually on surveys of urban markets, while fisheries
of rural villages have gone unnoticed. We compared the fishing characteristics (catch, effort and selectivity) between an
urban market and five small villages in the Lower Tocantins River (Brazilian Amazon), downstream from a large reservoir. We
recorded 86 and 601 fish landings in the urban market and villages, respectively, using the same methodology. The urban fishers
showed higher catch per unit of effort, higher amount of ice (related to a higher fishing effort, as ice is used to store
fish catches) and larger crew size per fishing trip, but village fishers had a higher estimated annual fish production. Conversely,
urban and village fishers used similar fishing gear (gillnets) and the main fish species caught were the same. However, village
fishers showed more diverse strategies regarding gear, habitats and fish caught. Therefore, although it underestimated the
total amount of fish caught in the Lower Tocantins River region, the data from the urban market could be a reliable indicator
of main fish species exploited and fishing gear used by village fishers. Monitoring and management should consider the differences
and similarities between urban and rural fisheries, in Amazon and in other tropical regions. 相似文献
49.
Certified management systems have increasingly been applied by firms in recent decades and now cover the management of health and safety, principally through the OHSAS 18001 standard. In order to become certified, firms must not only observe the relevant legislation, but also improve performance and raise goals within health and safety on a continuous basis. The article examines how certified occupational and health management systems influence this process to evaluate how far they hinder or support learning. It presents a model with which it is possible to identify and analyse improvement processes. The model is applied to five cases from a qualitative study of Danish manufacturers with certified health and safety management systems. The cases illustrate the wide variation in health and safety management among certified firms.Certification is found to support lower levels of continuous improvement performance in handling health and safety issues. However, more advanced improvement practices are shown to be connected to the integration of health and safety in other managerial areas, as well as to the employment of similar advanced improvement processes within firms. The article argues that certified health and safety management does not obstruct learning, and can support advanced learning. Improvement practices with regard to health and safety are mainly dependent upon the firm’s overall organisational processes and do not automatically arise from the standard alone. 相似文献
50.