全文获取类型
收费全文 | 151篇 |
免费 | 0篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 8篇 |
环保管理 | 14篇 |
综合类 | 25篇 |
基础理论 | 44篇 |
污染及防治 | 54篇 |
评价与监测 | 8篇 |
社会与环境 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 11篇 |
2012年 | 8篇 |
2011年 | 22篇 |
2010年 | 7篇 |
2009年 | 9篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 13篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
排序方式: 共有155条查询结果,搜索用时 15 毫秒
71.
72.
Evaluation of Fenton and ozone-based advanced oxidation processes as mature landfill leachate pre-treatments 总被引:1,自引:0,他引:1
Fenton treatment (Fe2+/H2O2) and different ozone-based Advanced Oxidation Processes (AOPs) (O3, O3/OH− and O3/H2O2) were evaluated as pre-treatment of a mature landfill leachate, in order to improve the biodegradability of its recalcitrant organic matter for subsequent biological treatment. With a two-fold diluted leachate, at optimised experimental conditions (initial pH 3, H2O2 to Fe2+ molar ratio of 3, Fe2+ dosage of 4 mmol L−1, and reaction time of 40 min) Fenton treatment removed about 46% of chemical oxygen demand (COD) and increased the five-day biochemical oxygen demand (BOD5) to COD ratio (BOD5/COD) from 0.01 to 0.15. The highest removal efficiency and biodegradability was achieved by ozone at higher pH values, solely or combined with H2O2. These results confirm the enhanced production of hydroxyl radical under such conditions. After the application for 60 min of ozone at 5.6 g O3 h−1, initial pH 7, and 400 mg L−1 of hydrogen peroxide, COD removal efficiency was 72% and BOD5/COD increased from 0.01 to 0.24. An estimation of the operating costs of the AOPs processes investigated revealed that Fe2+/H2O2 was the most economical system (8.2 € m−3 g−1 of COD removed) to treat the landfill leachate. This economic study, however, should be treated with caution since it does not consider the initial investment, prices at plant scale, maintenance and labour costs. 相似文献
73.
Garrido Isabel Fenoll José Flores Pilar Hellín Pilar Pérez-Lucas Gabriel Navarro Simón 《Environmental science and pollution research international》2021,28(19):23647-23656
Environmental Science and Pollution Research - One of the consequences of phytosanitary treatments applied to crops is the generation of a great volume of agro-wastewater having pesticide residues.... 相似文献
74.
García-Cambero Jesús Pablo Corpa Cristina Lucena Miguel Angel Méndez Paloma Sierra Pilar Galán-Madruga David Aguayo Sonia 《Environmental science and pollution research international》2021,28(36):49921-49935
Environmental Science and Pollution Research - Diclofenac (DCF), 17-β-estradiol (E2), and 17-α-ethinylestradiol (EE2) are emerging pollutants included in the first watch list agreed by... 相似文献
75.
76.
Development of a framework for fire risk assessment using remote sensing and geographic information system technologies 总被引:10,自引:0,他引:10
Emilio Chuvieco Inmaculada Aguado Héctor Nieto M. Pilar Martín Lara Vilar Susana Martín Juan de la Riva Francisco Rodríguez Miguel A. Herrera 《Ecological modelling》2010,221(1):46-58
Forest fires play a critical role in landscape transformation, vegetation succession, soil degradation and air quality. Improvements in fire risk estimation are vital to reduce the negative impacts of fire, either by lessen burn severity or intensity through fuel management, or by aiding the natural vegetation recovery using post-fire treatments. This paper presents the methods to generate the input variables and the risk integration developed within the Firemap project (funded under the Spanish Ministry of Science and Technology) to map wildland fire risk for several regions of Spain. After defining the conceptual scheme for fire risk assessment, the paper describes the methods used to generate the risk parameters, and presents proposals for their integration into synthetic risk indices. The generation of the input variables was based on an extensive use of geographic information system and remote sensing technologies, since the project was intended to provide a spatial and temporal assessment of risk conditions. All variables were mapped at 1 km2 spatial resolution, and were integrated into a web-mapping service system. This service was active in the summer of 2007 for semi-operational testing of end-users. The paper also presents the first validation results of the danger index, by comparing temporal trends of different danger components and fire occurrence in the different study regions. 相似文献
77.
Chemical signals are important for mate and species recognition. If variation in chemical signals occurs between populations
of the same species, these differences could later preclude mating between populations and lead to speciation. In the Iberian
wall lizard, Podarcis hispanica, the lipophilic fraction of femoral secretions of males is mainly a mix of steroids and fatty acids. Among steroids, the
most abundant compounds are cholesterol and cholesta-5,7-dien-3-ol, which are implicated in intraspecific communication and
sexual selection. Interpopulational differences in chemical signals of males, and in response to these chemicals, could contribute
to reproductive isolation between populations, which would explain the known genetic differences between these populations.
Chemical analyses indicated that five distinct populations of this lizard from Madrid (Central Spain) differed in the proportions
of two steroids (cholesterol and cholesta-5,7-dien-3-ol) in femoral secretions. Moreover, lizards discriminated and had high
chemosensory responses (i.e., high tongue-flick rates) to these steroids, but showed interpopulational differences. Lizards
from populations with cold temperatures and high relative humidity (i.e., northern Madrid) elicited higher responses to these
steroids, whereas the converse occurred for lizards from populations occupying dry and hot habitats (i.e., southern Madrid).
Interestingly, the magnitude of the chemosensory responses to cholesta-5,7-dien-3-ol in each population mirrored the abundance
of this compound in secretions of males of that population. These results suggest that the importance of cholesta-5,7-dien-3-ol
in males’ secretions might be lower for lizards from the southern populations. These differences in the relative importance
of chemical signals could explain reproductive isolation and cryptic speciation between populations of this lizard. 相似文献
78.
Jose Martín Pilar López Pablo Iraeta José A. Díaz Alfredo Salvador 《Behavioral ecology and sociobiology》2016,70(10):1657-1668
79.
Gallegos Pérula V Navarro Cerrillo RM Fernández Rebolloo P Valle Murillo G 《Environmental management》2003,31(1):86-99
The objective of this study was to examine postfire regeneration of tree, shrub, and dwarf shrub species, in relation to levels of damage in four planted pine forests (Pinus pinea, Pinus pinaster) in Andalusia. A prefire vegetation map was used for detailing species composition, vertical structure, and density and another for detailing the extent and intensity of fire damage. Between 3 and 7 years after the fires, an inventory was made of the vegetation in each area, using the step-point method. The information thus obtained was used to determine the amount of cover in the dwarf/shrub and tree layers, the frequency of species in each of the layers, floristic richness, and diversity (Shannon index). The botanical composition of the dwarf and shrub layer was analyzed using TWINSPAN. Variables were poorly correlated with level of fire damage, which suggests that the forests in this study followed the autosuccession model. Because of the artificial origin or seminatural condition, regeneration of the dominant tree species is poor, and it seems unlikely that forests will recover to their prefire state. Therefore action is recommended to restore these ecosystems. 相似文献
80.
Laura Nú?ez-Pons Marianna Carbone Debora Paris Dominique Melck Pilar Ríos Javier Cristobo Francesco Castelluccio Margherita Gavagnin Conxita Avila 《Die Naturwissenschaften》2012,99(5):353-368
Hexactinellids (glass sponges) are an understudied class with syncytial organization and poor procariotic associations, thought to lack defensive secondary metabolites. Poriferans, though, are outstanding sources of bioactive compounds; nonetheless, a growing suspicion suggests that many of these chemicals could be symbiont-derived. In Polar latitudes, sponges are readily invaded by diatoms, which could provide natural products. Hexactinellids are typical of deep waters; but in Antarctica, they dominate the upper shelf providing shelter and food supply to many opportunistic mesograzers and macroinvertebrates, which exert strong ecological pressures on them. Aiming to examine the incidence of defensive activities of hexactinellids against consumption, feeding experiments were conducted using their lipophilic fractions. Antarctic hexactinellid and demosponge extracts were tested against the asteroid Odontaster validus and the amphipod Cheirimedon femoratus as putative sympatric, omnivorous consumers. Hexactinellids yielded greater unpalatable activities towards the amphipod, while no apparent allocation of lipophilic defenses was noted. After chemical analyses on the lipophilic fractions from these Antarctic glass sponges, quite similar profiles were revealed, and no peculiar secondary metabolites, comparable to those characterizing other poriferans, were found. Instead, the lipidic compounds 5α(H)-cholestan-3-one and two glycoceramides were isolated for their particular outspread presence in our samples. The isolated compounds were further assessed in asteroid feeding assays, and their occurrence was evaluated for chemotaxonomical purposes in all the Antarctic samples as well as in glass sponges from other latitudes by NMR and MS. Characteristic sphingolipids are proposed as chemical markers in Hexactinellida, with possible contributions to the classification of this unsettled class. 相似文献