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 15 毫秒
111.
Agrawal Pankaj Araújo Aylanna P. M. Brito Gustavo F. Cavalcanti Shirley N. Alves Amanda M. Freitas Daniel M. G. Mélo Tomás J. A. 《Journal of Polymers and the Environment》2021,29(6):1777-1788
Journal of Polymers and the Environment - This work aims to investigate the effect of organically modified montmorillonite (OMMT) and vermiculite (OVT) clays on the properties of poly(lactic acid)... 相似文献
112.
Armando Jaramillo‐Legorreta Gustavo Cardenas‐Hinojosa Edwyna Nieto‐Garcia Lorenzo Rojas‐Bracho Jay Ver Hoef Jeffrey Moore Nicholas Tregenza Jay Barlow Tim Gerrodette Len Thomas Barbara Taylor 《Conservation biology》2017,31(1):183-191
The vaquita (Phocoena sinus) is the world's most endangered marine mammal with approximately 245 individuals remaining in 2008. This species of porpoise is endemic to the northern Gulf of California, Mexico, and historically the population has declined because of unsustainable bycatch in gillnets. An illegal gillnet fishery for an endangered fish, the totoaba (Totoaba macdonaldi), has recently resurged throughout the vaquita's range. The secretive but lucrative wildlife trade with China for totoaba swim bladders has probably increased vaquita bycatch mortality by an unknown amount. Precise population monitoring by visual surveys is difficult because vaquitas are inherently hard to see and have now become so rare that sighting rates are very low. However, their echolocation clicks can be identified readily on specialized acoustic detectors. Acoustic detections on an array of 46 moored detectors indicated vaquita acoustic activity declined by 80% between 2011 and 2015 in the central part of the species’ range. Statistical models estimated an annual rate of decline of 34% (95% Bayesian credible interval –48% to –21%). Based on results from 2011 to 2014, the government of Mexico enacted and is enforcing an emergency 2‐year ban on gillnets throughout the species’ range to prevent extinction, at a cost of US$74 million to compensate fishers. Developing precise acoustic monitoring methods proved critical to exposing the severity of vaquitas’ decline and emphasizes the need for continual monitoring to effectively manage critically endangered species. 相似文献
113.
114.
115.
Débora Toledo Ramos Leila Teresinha Maranho Ana Flávia Locateli Godoi Marco Aurélio da Silva Carvalho Filho Luiz Gustavo Lacerda Eliane Carvalho de Vasconcelos 《Water, Air, & Soil Pollution: Focus》2009,9(3-4):293-302
Petroliferous activities in Brazil have an accelerated development in the last years. As a consequence, the incidence of environmental accidents such as oil spills and contamination of soils has increased significantly. Therefore, it is extremely necessary to develop remediation techniques with lower costs, decontamination efficiency and impact minimisation. The aim of this work was to evaluate Sebastiania commersoniana phytoremediation potential in soil contaminated by petroleum. This species, which is a native tree, was selected due to its proven capacity for surviving in areas contaminated by petroleum. Experiments were carried out with soils that were vegetated but non-contaminated, soils that were freshly contaminated (25, 50 and 75 g kg?1) but non-vegetated, and soils that were vegetated and contaminated, samples were collected 60 and 424 days after contamination with the purpose of evaluating the percentage of petroleum degradation in relation to the time. The results obtained in the present study allow us to state that S. commersoniana proves to be tolerant to petroleum contamination with respect to plant’s growth. The degradation of petroleum hydrocarbons was evaluated by gas chromatography with a flame ionisation detector (GC-FID) equipped with a capillary column HP-5 (5% phenyl-methylpolysiloxane, 30 m; 0.25 mm; 0.25 μm). According to chromatographic analysis, samples in contact with S. commersoniana showed a significant area reduction of the hydrocarbon peaks. Analysis of the 60-day samples showed a reduction of petroleum hydrocarbons area higher than 60% and the 424-day samples showed a reduction higher than 94%, which demonstrates that a petroleum degradation process is occurring. 相似文献
116.
Glenda Morais Rocha Bra?a Ana Luisa Miranda-Vilela Cesar Koppe Grisolia 《Journal of Agricultural and Environmental Ethics》2012,25(5):675-685
The introduction of genetically modified plants into the environment has been marked by different positions, either in favor of or against their release. However, the problem goes well beyond such contradictory positions; it is necessary to take into account the legislation, ethics, biosafety, and the environment in the considerations related to the release of genetically modified organisms (GMOs). To this end, the Brazilian Committee of Biosafety (CTNBio), a consultative and deliberative multidisciplinary collegiate, provides technical and advisory support to the Brazilian Federal Government. This committee consists of scientists and non-scientists who participate in evaluating the dossiers of companies that are requesting approval by the Brazilian Government; consequently, the aim of this study was to investigate whether commercial approvals of GMOs were associated with the profile of the CTNBio members. Research was based on the minutes taken at CTNBio meetings carried out from 2006 up to 2009, considering law 11.105/2005 and the Constitution of 1988 as legal frameworks, to determine the number of voters in favor of or against releasing genetically modified Bt-maize, Bt-cotton, and herbicide resistant soybeans to be used in Brazilian agriculture. Via the internet, we had access to the curriculum vitae of the CTNBio members through the Plataforma Lattes database of the National Council for Scientific and Technological Development (CNPq), where we found their area of expertise. CTNBio members were divided into expert-for, expert-against, non-expert-for, and non-expert-against. Results showed that CTNBio decisions could be based on technical criteria as well as on the policy of the institution that expert-members were representing. 相似文献
117.
Environmental and Ecological Statistics - This paper presents an extension of the Geostatistical model under preferential sampling in order to accommodate possible local repulsion effects. This... 相似文献
118.
Understanding the climate and its variability, in particular with regard to their socioeconomic impact, requires specific
measurements of precipitation and temperature and their circulations. This becomes more important in applications to diverse
systems. In order to improve knowledge about temporal changes and trends in temperature, we analyzed series of maximum and
minimum daily surface temperatures at eight reference stations in southeastern South America during variable periods, with
the longest periods of around 100 years. To study the evolution of the temperature series and to reduce the number of parameters,
a nonhierarchical cluster analysis was performed. The algorithm assigns each day to one of four groups: warm, wet, cold and
dry. Low frequency variations were found in these groups and their association with circulation structure, circulation patterns
and precipitation. We concluded that the set of wet days is one of the main factors driving secular variations of maximum
and minimum temperature and variations in precipitation. We also inferred that after 1920 till 1930, a low frequency oscillation
is observed in the form of linear trends (increase of warm days and decrease of cold days). 相似文献
119.
Gustavo Horacio Nadal Gonzalo Bravo Leonidas Osvaldo Girardin Sebastián Gortari 《Environment, Development and Sustainability》2013,15(4):1079-1097
This work addresses increasing concerns about water management for rural productive activities in the vast dry regions of Latin America by assessing renewable energy technologies (RETs) that could be suitable for localized needs. Forecasted trends in climate change and variability make this analysis very relevant, in an area where very little published work exists. While Argentina is widely known for its fertile pampas, around 75 % of the country consists of dry lands. In addition, erosion is increasing by up to 650,000 hectares each year. The coordinated adoption of a set of actions, including land use planning and strengthening productive activities that guarantee access to water and improve water and soil management is needed. Renewable energies could help towards achieving these aims, if water is made available at affordable costs and with suitable technologies. This paper evaluates experiences with three RETs—photovoltaic pumping from deep wells, small wind turbine pumping, and high-power wind turbines, and discusses a potential role for use in rural Argentina. Although cheaper and more reliable renewable alternatives to energy sources such as diesel could be used for pumping from groundwater resources in isolated locations, limitations arise when pumping head and/or water volume requirements are large or highly seasonal. The cost increases and technical challenges of accessing this deeper water, as indicated by case studies, emphasize the importance of planning and support schemes development. 相似文献
120.
Pagsuyoin Sheree A. Salcedo Gustavo Santos Joost R. Skinner Christopher B. 《The Environmentalist》2022,42(3):350-361
Environment Systems and Decisions - In this paper, we analyzed the association among trends in COVID-19 cases, climate, air quality, and mobility changes during the first and second waves of the... 相似文献