全文获取类型
收费全文 | 257篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 16篇 |
环保管理 | 21篇 |
综合类 | 33篇 |
基础理论 | 58篇 |
污染及防治 | 85篇 |
评价与监测 | 27篇 |
社会与环境 | 18篇 |
出版年
2023年 | 8篇 |
2022年 | 12篇 |
2021年 | 17篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 21篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 12篇 |
2014年 | 10篇 |
2013年 | 21篇 |
2012年 | 16篇 |
2011年 | 18篇 |
2010年 | 25篇 |
2009年 | 12篇 |
2008年 | 10篇 |
2007年 | 16篇 |
2006年 | 11篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1995年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有260条查询结果,搜索用时 171 毫秒
61.
Baganha Baptista PR Bernardes C Cunha TR 《Environmental monitoring and assessment》2011,179(1-4):589-604
Government and environmental entities are becoming increasingly concerned with qualifying and quantifying the erosion effects that are observed in sandy shores. Correspondingly, survey methodologies that gather data for such erosion studies are increasingly being demanded. The responsible entities are continually broadening their areas of interest, are concerned in the establishment of regular monitoring programmes and are demanding high accuracy from the geo-spatial data that is collected. The budget available for such monitoring activities, however, does not parallel the trend in the increasing demand for quality specifications. Survey methodologies need improvement to meet these requirements. We have developed a new land-based survey system--the INSHORE system--that is ideal for low cost, highly efficient and highly precise coastal surveys. The INSHORE system uses hi-tech hardware that is based on high-grade global positioning system (GPS) receivers and a laser distance sensor combined with advanced software algorithms. This system enables the determination of the ground coordinates of the surveyed areas with a precision of 1 to 2 cm, without having a sensor in contact with the ground surface. The absence of physical contact with the ground makes this system suitable for high-efficiency surveys. The accuracy of the positioning, which is based on advanced differential GPS processing, is enhanced by considering the estimated attitude of the GPS receiver holding structure and eliminates undesirable offsets. This paper describes the INSHORE survey system and presents the results of validation tests that were performed in a sandy shore environment. 相似文献
62.
Santos MJ Sousa JP Tiago I Veríssimo A Lemos MF 《Journal of environmental monitoring : JEM》2011,13(8):2102-2104
Changes in saprophytic organism's gut microbial communities may present a threat to organic matter breakdown which can ultimately lead to soil function impairment. In this study, Amplified Ribosomal DNA Restriction Analysis (ARDRA) was evaluated as a potential simple molecular tool to assess shifts in bacterial community structure in hindgut populations of Porcellio dilatatus exposed to contaminated food. This prospective tool can also be used for a variety of purposes and samples prior to the use of more specific and sophisticated methods. 相似文献
63.
The European Union introduced several policy instruments based in the extended producer responsibility (EPR) in order to improve the environmental performance of products and services through their life cycles. In this context, the Portuguese government decided to apply the EPR concept to tyres, and producers were obliged to constitute an end-of-life management system to promote the collection, recycling and reuse of end-of-life (EOL) tyres. This required producers, distributors, recyclers and retreaders to be identified and characterized, and local processing infrastructures to be analyzed. The information was used to design an economically optimised EOL tyre management system while promoting the activity of all EOL operators in order for the imposed collecting and recovery targets to be fulfilled. This paper discusses the interaction between the different governmental, private and academic institutions for the creation of the integrated management system for EOL tyres, the approach taken, the technical, political and legal aspects underneath them, as well as the environmental consequences induced by the creation of the management system. The results obtained during the first years of operation are reported and show an increase in the collection and recycling of EOL tyres and the consolidation of the collection and processing infrastructures. 相似文献
64.
Pedrosa P 《Environmental monitoring and assessment》2007,129(1-3):137-150
This study investigates the inherent optical properties (IOP) of a Brazilian river during a non-natural, anthropogenically
mediated, toxic spill of a wood-pulping factory (the ‘Cataguazes accident’). The results indicated an outstanding transformation
in the river water chromophoric dissolved organic matter (CDOM) pools. For instance, increases in CDOM absorption coefficients,
a
CDOM
(λ), which were averaged at specific spectral intervals, , ranged from 58-fold at the UV-B and UV-A ranges to 95-fold at the PAR range. As a result, the water color expressed as CDOM
absorption at 440 nm, a
CDOM
(440), varied from 4.16 to 365.03 m-1. For S-coefficient, the variations ranged from ∼1.1 to 5.6-fold, respectively, at the 300–650 nm and UV-B range. The variability
of S as a proxy of dissolved chromophores was thus clearly influenced by the spectral range used. Optical proportions were also
investigated through the use of and S ratios at the UV-B, UV-A, and PAR ranges and, in the case of , also at the NIR range. This approach also showed clear variations between the water samples, likely reflecting changes in
the composition of optically active substances in the river system. As a whole, the findings obtained here indicated that
both the quantity and quality of the chromophoric material dissolved in the river water were greatly altered by the toxic
spill. The changes in the optical properties of the river water, although extreme and likely with no parallel in the literature,
were quite rapid as indicated by the optical resilience of the system. Overall, this study indicates that IOP might be thought,
and possibly used, as a metric tool for monitoring the state of waters and aquatic ecosystems. 相似文献
65.
Atmospheric BTEX concentrations in the vicinity of the crude oil refinery of the Baltic region 总被引:1,自引:0,他引:1
Baltrėnas P Baltrėnaitė E Serevičienė V Pereira P 《Environmental monitoring and assessment》2011,182(1-4):115-127
Among chemical industries, petroleum refineries have been identified as large emitters of a wide variety of pollutants. Benzene, toluene, ethylbenzene, and xylene (BTEX) form an important group of aromatic volatile organic compounds (VOCs) because of their role in the troposphere chemistry and the risk posed to human health. A very large crude oil refinery of the Baltic States (200,000 bbl/day) is situated in the northern, rural part of Lithuania, 10 km from the town of Ma?eikiai (Lithuania). The objectives of this study were: (1) to determine of atmospheric levels of BTEX in the region rural and urban parts at the vicinity of the crude oil refinery; and (2) to investigate the effect of meteorological parameters (wind speed, wind direction, temperature, pressure, humidity) on the concentrations measured. The averaged concentration of benzene varied from 2.12 ppbv in the rural areas to 2.75 ppbv in the urban areas where the traffic was determined to be a dominant source of BTEX emissions. Our study showed that concentration of benzene, as strictly regulated air pollutant by EU Directive 2008/50/EC, did not exceed the limit of 5 ppbv in the region in the vicinity of the crude oil refinery during the investigated period. No significant change in air quality in the vicinity of the oil refinery was discovered, however, an impact of the industry on the background air quality was detected. The T/B ratio (0.50-0.81) that was much lower than 2.0, identified other sources of pollution than traffic. 相似文献
66.
Copulatory plugs do not assure high first male fertilisation success: sperm displacement in a lizard
Pedro L. Moreira Vera L. Nunes José Martín Octávio S. Paulo 《Behavioral ecology and sociobiology》2007,62(2):281-288
Sperm competition selects for opposing male defensive and offensive reproductive traits, and its outcome may be determined
by the effectiveness to which one trait has evolved to out-compete the other. We tested the effectiveness of a first male
plug physical interference with a second male insemination (defence) vs the effectiveness of plug and associated sperm displacement
by a second male (offence) on the outcome of sperm competition in Iberian rock lizards. We conducted a double mating experiment
where we compared the proportion of eggs per clutch fertilised by the same second males (against the same first males) when
they copulated with females 30 min (first male plug adhered firmly inside the female cloaca) and 4 h (first male plug loosely
adhered or shed from the female cloaca) after first males. We found that second males fertilised the majority of the eggs
per clutch in the 30-min treatment, whereas fertilisations were equally shared between the two males in the 4-h treatment.
These results show that plugs have little defensive effectiveness, and thus, do not assure high first male fertilisation success.
Instead, sperm displacement appears to be associated with plug displacement. That is, because sperm embedded in first male
plugs, and displaced from competition for fertilisations by second males, is expected to increase in number with decreasing
time allowed for female sperm transport, second males thus enjoy higher fertilisation success. This study shows that offensive
plug displacement out-competes plug defensive role in Iberian rock lizards. Moreover, it reveals sperm displacement as a novel
sperm competition mechanism in reptiles. 相似文献
67.
在旱季,亚马孙河巨龟(Podocnemis
expansa)将巢穴修筑在河槽边缘和内部的广阔沙洲上.这些巢穴在某些沙滩上的某些具体地点的大量聚集表明巢穴位置的选择不是随机的,而是与一些地质状况有关,如沙洲边缘的倾斜度和砂质高台的存在.通向高台顶端的通道或斜坡结构的存在是巢穴位置选择的决定性因素.被侵蚀的以及陡峭的沙滩边缘阻碍了亚马孙河龟到达最理想的筑巢位置.随着时间的推移,沙滩形态的变化会改变巢穴的分布. 相似文献
68.
Miagostovich Marize Pereira Rocha Mônica Simões dos Reis Fabiane Bertoni Sampaio Marcelo Santos de Saldanha da Gama Gracie Carrijo Renata Malta Fabio Correia Rodrigues Janaína Genuino Amanda Ribeiro da Silva Assis Matheus Fumian Tulio Machado Barrocas Paulo Rubens Guimarães 《Food and environmental virology》2020,12(2):130-136
Food and Environmental Virology - The availability of drinking water is one of the main determinants of quality of life, disease prevention and the promotion of health. Viruses are important agents... 相似文献
69.
Paulo R. Dores-Silva Jussara A. O. Cotta Maria D. Landgraf 《Journal of environmental science and health. Part. B》2013,48(7):598-604
AbstractPolycyclic Aromatic Hydrocarbons (PAHs) are among the environmental pollutants that have very high carcinogenic and mutagenic activity. Among hundreds of different PAHs, 17 are considered priority pollutants and routinely monitored for regulatory purposes. Extended periods of exposure and expensive clean-up costs are typically associated with the vast majority of processes used for the remediation of areas contaminated with PAHs. The results of this study indicate that bioremediation via vermicomposting could be an effective method for remedying soils contaminated with toxic organic compounds, such as PAHs. This study was conducted over 90?days in the presence of various quantities of organic matter (cattle manure) to recover soils contaminated with PAHs. High-performance liquid chromatography (HPLC) was applied to identify PAHs. An evaluation of the toxicity of the final material and the transformation of the organic matter throughout the process was also conducted. The data presented here suggest a relationship between the molar mass of the PAHs and the ability of the vermicomposting process to promote biodegradation. These results suggest that vermicomposting has great potential to be utilized as a tool for the bioremediation of soils impacted by PAHs. 相似文献
70.
Marize Pereira Miagostovich Flávia Ramos Guimarães Carmen Baur Vieira Tulio Machado Fumian Nilson Porto da Gama Matias Victoria Jaqueline Mendes de Oliveira Anna Carolina de Oliveira Mendes Ana Maria Coimbra Gaspar José Paulo Gagliardi Leite 《Food and environmental virology》2014,6(2):110-115
The preservation of water resources is one of the goals of the designation of parks that act as natural reservoirs. In order to assess the impact of the presence of humans in an environmental preservation area bordering urban areas, the presence of four pathogenic enteric viruses [group A rotavirus (RV-A), norovirus (NoV), human adenoviruses (HAdV), and hepatitis A virus (HAV)], as well as the physico-chemical parameters, and Escherichia coli levels were assessed in riverine water samples. From June 2008 to May 2009, monthly monitoring was performed along the Engenho Novo River. RV-A, NoV, and HAdV were observed in 29 % (31/108) of the water samples, with concentrations of up to 103 genome copies/liter. The natural occurrence of infectious HAdV was demonstrated by Integrated Cell Culture-PCR (ICC-PCR). This study confirms the suitability of using the detection of fecal-oral transmitted viruses as a marker of human fecal contamination in water matrices and indicates the spread of pathogenic viruses occurring in an alleged area of environmental protection. 相似文献