全文获取类型
收费全文 | 395篇 |
免费 | 6篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 19篇 |
环保管理 | 34篇 |
综合类 | 100篇 |
基础理论 | 68篇 |
环境理论 | 1篇 |
污染及防治 | 122篇 |
评价与监测 | 28篇 |
社会与环境 | 21篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 8篇 |
2022年 | 16篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 13篇 |
2017年 | 17篇 |
2016年 | 21篇 |
2015年 | 12篇 |
2014年 | 16篇 |
2013年 | 23篇 |
2012年 | 34篇 |
2011年 | 21篇 |
2010年 | 10篇 |
2009年 | 20篇 |
2008年 | 19篇 |
2007年 | 19篇 |
2006年 | 14篇 |
2005年 | 12篇 |
2004年 | 10篇 |
2003年 | 13篇 |
2002年 | 10篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 6篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1964年 | 2篇 |
1961年 | 1篇 |
1959年 | 2篇 |
1957年 | 2篇 |
1956年 | 1篇 |
1954年 | 1篇 |
1948年 | 1篇 |
1932年 | 1篇 |
1931年 | 1篇 |
1925年 | 2篇 |
1924年 | 2篇 |
1923年 | 2篇 |
1921年 | 3篇 |
1920年 | 1篇 |
1919年 | 1篇 |
1918年 | 2篇 |
1917年 | 1篇 |
1914年 | 1篇 |
排序方式: 共有406条查询结果,搜索用时 15 毫秒
21.
de Figueiredo DR Ferreira RV Cerqueira M de Melo TC Pereira MJ Castro BB Correia A 《Environmental monitoring and assessment》2012,184(1):471-485
The information on bacterial community composition (BCC) in Portuguese water bodies is very scarce. Cértima River (central
western Portugal) is known to have high levels of pollution, namely organic. In the present work, the BCC from a set of 16
water samples collected from Cértima River Basin and its main tributaries was characterized using 16S rDNA–denaturing gradient
gel electrophoresis, a culture-independent molecular approach. Molecular data were related to environmental parameters through
multivariate analysis to investigate potential impact of water pollution along the river. Principal component analysis using
environmental data showed a water quality gradient from more pristine waters (at the mountain tributaries) to waters with
increasingly eutrophic potential (such as Fermentelos Lake). This gradient was mainly defined by factors such as organic and
inorganic nutrient sources, electrical conductivity, hydrogen carbonate concentration, and pH. Molecular results showed variations
in BCC along Cértima River Basin but in the main river section, a Bacteroidetes phylotype (Flavobacterium sp.) proved to be dominant throughout the river course. Multivariate analysis suggests that spatial variation of BCC along
the Cértima River Basin depended mainly on parameters such as Chl a, total suspended solid (TSS), total organic carbon, electrical conductivity, and HCO
_boxclose^-_{3}^{-} levels. Bacteroidetes phylotypes were all related to higher electrical conductivity and HCO3-_{3}^{-} levels although some of these were also correlated with high SO42-_{4}^{2-} and others with high soluble reactive phosphorus, nitrate, TN, and Kjeld-N levels. The Gammaproteobacteria occurrence was correlated with high SO42-_{4}^{2-} levels. One of the Betaproteobacteria phylotypes showed to correlate with low redox potential (Eh) and high temperature, pH, TSS, and Chl a levels while another one showed a negative correlation with Chl a values. 相似文献
22.
This article sets out to analyse how and to what degree land use is linked to the physical characteristics of the territory
itself, and the way in which changes in land use are determined by agricultural and socio-demographic dynamics. The study
was conducted within the territorial boundaries of five municipalities surrounding Lake Trasimeno and refers to the periods
1977–2000 for land use and 1971–2001 for socio-demography data. The use of environmental, social, economic and agricultural
indicators demonstrates how a mix of various indicators are useful for monitoring the changes which took place. It also shows
the powerful influence that socio-demographic factors exert upon land use and landscape change. 相似文献
23.
Ana L. De Toffoli Bruno H. Fumes 《Journal of environmental science and health. Part. B》2018,53(7):434-440
On-line in-tube solid phase microextraction (in-tube SPME) coupled to high performance liquid chromatography and tandem mass spectrometry (HPLC-MS/MS) was successfully applied to the determination of selected triazines in water samples. The method based on the employment of a packed column containing graphene oxide (GO) supported on aminopropyl silica (Si) showed that the extraction phase has a high potential for triazines extraction aiming to its physical-chemical properties including ultrahigh specific surface area, good mechanical and thermal stability and high fracture strength. Injection volume and loading time were both investigated and optimized. The method validation using Si-GO to extract and concentrate the analytes showed satisfactory results, good sensitivity, good linearity (0.2–4.0 µg L?1) and low detection limits (1.1–2.9 ng L?1). The high extraction efficiency was determined with enrichment factors ranging from 1.2–2.9 for the lowest level, 1.3–4.9 intermediate level and 1.2–3.0 highest level (n = 3). Although the analytes were not detected in the real samples evaluated, the method has demonstrated to be efficient through its application in the analysis of spiked triazines in ground and mineral water samples. 相似文献
24.
Md. Badiuzzaman Khan Mauro Masiol Caterina Bruno Alberto Pasqualetto Gian Maria Formenton Claudio Agostinelli Bruno Pavoni 《Environmental science and pollution research international》2018,25(32):31987-32000
A yearlong sampling campaign (2012–2013) was conducted in six major cities of the Veneto region to investigate the spatial-temporal trends and the factors affecting the polycyclic aromatic hydrocarbon (PAHs) variations and identify the local sources. Sixty samples per city were collected for analyses in every alternate month (April, June, August, October, December, and February): 10 samples per sampling site in 10 consecutive days of the months selected. Samples were ultrasonically extracted with acetonitrile and processed through high-performance liquid chromatography. Total Σ-PAH concentrations ranged from 0.19 to 70.4 ng m?3 with a mean concentration of 11.5 ng m?3. The mean benzo[a]pyrene (BaP) concentration reached 2.0 ng m?3, which is two-times higher than the limit set by the European Union. BaP contributed for 17.4% to the total concentration of PAHs, which showed the same pattern across the region with maxima during cold months and minima in the warm period. In this study, PAHs showed an inverse relationship with temperature, solar radiation, wind speed, and ozone. According to this study, biomass burning for household heating and cooking, followed by gaseous PAHs absorption on particles due to low atmospheric temperature, were the main reasons for increasing PAHs concentration in winter. Health risk, evaluated as lifetime lung cancer risk (LCR), showed a potential carcinogenic risk from the airborne BaPTEQ six-fold higher in the cold season than in the warm one. Diagnostic ratios and conditional probability functions were used to locate the sources, and results confirmed that local emission, overall domestic heating, and road transport exhausts were responsible for higher concentration rates of PAHs as well as of PM2.5. 相似文献
25.
Benito-Garzón Marta Fady Bruno Davi Hendrik Vizcaíno-Palomar Natalia Fernández-Manjarrés Juan 《Regional Environmental Change》2018,18(5):1427-1437
Regional Environmental Change - The adaptation of social-ecological systems such as managed forests depends largely on decisions taken by forest managers who must choose among a wide range of... 相似文献
26.
Ultrasound effects on the activity of Aspergillus niger lipases in their application in dairy wastewater treatment 下载免费PDF全文
Simone M. Golunski Jessica Mulinari Aline Frumi Camargo Bruno Venturin Daiane P. Baldissarelli Camila Torbes Marques Gean D. L. P. Vargas Luciane Maria Colla Altemir Mossi Helen Treichel 《环境质量管理》2017,27(1):95-101
We evaluated the effect of ultrasound radiation on lipase activity. The experiments were conducted using a low‐cost crude enzyme extract. We then used this lipase to treat dairy effluent. The results of our study presented an increase of approximately 430% in the concentration of free fatty acids. 相似文献
27.
Herlander Mata‐Lima A. Alvino‐Borba Ivan Y. Salazar Vasquez Jakelline Jard da Silva Bruno Hernandez Incau José A. Almeida 《环境质量管理》2017,27(1):41-48
In view of the Brazilian Ten‐Year Energy Expansion Plan 2021, this article presents a discussion on environmental flow (e‐flow). The authors analyze the literature to show the evolution of publications concerning e‐flow releases from the perspective of ecosystems services preservation considering results from different case studies from throughout the world. Finally, two main recommendations are drawn regarding e‐flow are: (1) performing a holistic approach to e‐flow planning, including hydrological, hydraulic, water quality, habitat, and riparian zone considerations; and (2) installing in new structures adequate bottom outlets to allow a range of adjustable e‐flow from reservoir dams to reproduce natural flow variations. 相似文献
28.
Distribution of PCDD/Fs and dioxin-like PCBs in sediment and plants from a contaminated salt marsh (Tejo estuary,Portugal) 总被引:1,自引:0,他引:1
Margarida Nunes Anaïs Vernisseau Philippe Marchand Bruno Le Bizec Fernando Ramos Miguel A. Pardal 《Environmental science and pollution research international》2014,21(4):2540-2549
Concentrations and profiles of 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) were investigated in sediment and plants collected from a salt marsh in the Tejo estuary, Portugal. The highest PCDD/F and dl-PCB concentrations were detected in uncolonized sediments, averaging 325.25?±?57.55 pg g?1 dry weight (dw) and 8,146.33?±?2,142.14 pg g?1 dw, respectively. The plants Sarcocornia perennis and Halimione portulacoides growing in PCDD/F and dl-PCB contaminated sediments accumulated contaminants in roots, stems, and leaves. It was observed that PCDD/F and dl-PCB concentrations in roots were significantly lower in comparison with stems and leaves. In general, concentration of ΣPCDD/Fs and Σdl-PCBs in H. portulacoides tissues were found to be twofold higher than those in S. perennis, indicating a difference in the accumulation capability of both species. Furthermore, congener profiles changed between sediments and plant tissues, reflecting a selective accumulation of low chlorinated PCDD/Fs and non-ortho dl-PCBs in plants. 相似文献
29.
Lambert O Veyrand B Durand S Marchand P Le Bizec B Piroux M Puyo S Thorin C Delbac F Pouliquen H 《Chemosphere》2012,86(1):98-104
Three beehive matrices, sampled in six different apiaries from West France, were analyzed for the presence of four polycyclic aromatic hydrocarbons (PAH4: benzo[a]pyrene, benzo[a]anthracene, benzo[b]fluoranthene and chrysene). Samples were collected during four different periods in both 2008 and 2009. Honey samples showed the lowest levels of PAH4 contamination (min = 0.03 μg kg−1; max = 5.80 μg kg−1; mean = 0.82 μg kg−1; Sd = 1.17). Bee samples exhibited higher levels of PAH4 contamination (min = 0.32 μg kg−1; max = 73.83 μg kg−1; mean = 7.03 μg kg−1; Sd = 17.83) with a great dispersion of the concentrations due to four main events of high concentrations. Pollen samples showed only one major episode with the highest PAH4 concentration found (min = 0.33 μg kg−1; max = 129.41 μg kg−1; mean = 7.10 μg kg−1; Sd = 22.28). The PAH4 concentrations found were significantly influenced by the landscape context for all beehive samples. 相似文献
30.
Blood composition is commonly measured to assess exposure to and effects of metals on birds. In most of passerine species, only small volumes of blood may be sampled safely (<500 μL), which limit the measure of several markers of health status and chemical residues. Here, we documented the partitioning of Cd and Pb in the blood of European Blackbirds Turdus merula in order to propose usable relationships between whole blood concentrations (for which toxicological benchmarks exist) and those measured in the erythrocytes. Sixty-two blackbirds were trapped along a pollution gradient (smelter of Metaleurop Nord, Northern France). Blood was sampled and Cd and Pb concentrations were measured both in whole blood and in the erythrocytes only. Birds coming from the most contaminated sites exhibited high residues for both Cd and Pb. We assessed that 73% and 99% of Cd and Pb, respectively, were associated to erythrocytes. Strong linear relationships, that were not influenced by neither the age nor the sex, were established between whole blood residues and those of erythrocytes for Cd and Pb (adj-R2 = 0.78 and 0.93, respectively). Present findings are promising to optimize the use of small blood samples in order to investigate several responses relative to wildlife health status. 相似文献