全文获取类型
收费全文 | 2858篇 |
免费 | 2篇 |
国内免费 | 34篇 |
专业分类
安全科学 | 56篇 |
废物处理 | 141篇 |
环保管理 | 290篇 |
综合类 | 389篇 |
基础理论 | 1092篇 |
污染及防治 | 564篇 |
评价与监测 | 190篇 |
社会与环境 | 172篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 111篇 |
2017年 | 117篇 |
2016年 | 181篇 |
2015年 | 51篇 |
2014年 | 15篇 |
2013年 | 22篇 |
2012年 | 427篇 |
2011年 | 210篇 |
2010年 | 24篇 |
2009年 | 29篇 |
2008年 | 46篇 |
2007年 | 63篇 |
2006年 | 65篇 |
2005年 | 393篇 |
2004年 | 528篇 |
2003年 | 404篇 |
2002年 | 42篇 |
2001年 | 39篇 |
2000年 | 18篇 |
1999年 | 30篇 |
1998年 | 4篇 |
1997年 | 9篇 |
1996年 | 3篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1961年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有2894条查询结果,搜索用时 46 毫秒
91.
Singh HP Sharma VP Batish DR Kohli RK 《Environmental monitoring and assessment》2012,184(4):1813-1821
Indiscriminate adoption and use of cell phone technology has tremendously increased the levels of electromagnetic field radiations
(EMFr) in the natural environment. It has raised the concerns among the scientists regarding the possible risks of EMFr to
living organisms. However, not much has been done to assess the damage caused to plants that are continuously exposed to EMFr
present in the environment. The present study investigated the biochemical mechanism of interference of 900 MHz cell phone
EMFr with root formation in mung bean (Vigna radiata syn. Phaseolus aureus) hypocotyls, a model system to study rhizogenesis in plants. Cell phone EMFr enhanced the activities of proteases (by 1.52
to 2.33 times), polyphenol oxidases (by 1.5 to 4.3 times), and peroxidases (by 1.5 to 2.0 times) in mung bean hypocotyls over
control. Further, EMFr enhanced malondialdehyde (an indicator of lipid peroxidation), hydrogen peroxide, and proline content,
indicating a reactive oxygen species-mediated oxidative damage in hypocotyls. It was confirmed by the upregulation in the
activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase, catalase, and glutathione
reductase) suggesting their possible role in providing protection against EMFr-induced oxidative damage. The study concluded
that cell phone radiations affect the process of rhizogenesis through biochemical alterations that manifest as oxidative damage
resulting in root impairment. 相似文献
92.
Chaudhary P Singh SB Chaudhry S Nain L 《Environmental monitoring and assessment》2012,184(2):1145-1156
The present study is aimed at analysing and comparing different soil enzymes in soil samples of native contaminated sites
of a Mathura refinery and adjoining agricultural land. Enzyme activities are considered as indicators of soil quality and
changes in biogeochemical function due to management or perturbations. Soil samples were collected from the premises and nearby
area of Mathura refinery, India. Biological health parameters (dehydrogenase, aryl esterase, aryl sulphatase,
\upbeta \upbeta -glucosidase, alkaline phosphatase, acid phosphatase, lipase, laccase and catalase activity) were estimated in the soil samples.
Among all the samples, sewage sludge soil showed maximum activity of enzymes, microbial biomass carbon and most probable number
of polycyclic aromatic hydrocarbon (PAH) degraders in soils spiked with three- to four-ring PAHs at 50 ppm. Available phosphorus,
potassium and nitrogen was also exceptionally high in this sample, indicating maximum microbial bioconversion due to presence
of nutrients stimulating potent PAH-degrading microorganisms. 相似文献
93.
Sediment quality guidelines (SQGs) can be derived using different approaches and are commonly used in environmental management,
reclamation, and risk assessment. The screening-level concentration (SLC) approach has been used in Ontario, Canada, to derive
lowest effect levels (LELs) and severe effect levels for use as SQGs. This approach was adopted by the Canadian Nuclear Safety
Commission (CNSC) to set guidelines for metals (As, Cr, Cu, Pb, Mo, Ni, Se, U, and V) and radionuclides (Ra-226, Pb-210, and
Po-210) in sediment at northern Saskatchewan uranium mining and milling operations. The SLC approach is based on total metal
and radionuclide concentrations in sediment, and corresponding benthic community composition data for a specific sampling
site. In this study, sediment chemistry (total metals and radionuclides) and benthic community data from northern Saskatchewan
uranium operations were compiled and examined. Results indicate that the CNSC-derived SQGs had limited relationships to observed
effects, or lack thereof, on benthic invertebrate communities near uranium operations in Saskatchewan. The LELs were found
to correctly align with effects at 95% of the sites that had effects, on a general basis, but on an element-specific basis
many of the elements had concentrations at effect sites below their LELs. Furthermore, concentrations of the evaluated elements
exceeded at least one LEL at 60% of the no-effect sites. The high number of exceedences of LELs at reference and no-effect
sites (false-positives) calls to question the appropriateness of the CNSC-derived SQGs. It is suggested that alternatives
to the SLC approach be explored. 相似文献
94.
Effect of dust load on the leaf attributes of the tree species growing along the roadside 总被引:1,自引:0,他引:1
R. K. Chaturvedi Shikha Prasad Savita Rana S. M. Obaidullah Vijay Pandey Hema Singh 《Environmental monitoring and assessment》2013,185(1):383-391
Dust is considered as one of the most widespread air pollutants. The objective of the study was to analyse the effect of dust load (DL) on the leaf attributes of the four tree species planted along the roadside at a low pollution Banaras Hindu University (BHU) campus and a highly polluted industrial area (Chunar, Mirzapur) of India. The studied leaf attributes were: leaf area, specific leaf area (SLA), relative water content (RWC), leaf nitrogen content (LNC), leaf phosphorus content (LPC), chlorophyll content (Chl), maximum stomatal conductance (Gsmax), maximum photosynthetic rate (A max) and intrinsic water-use efficiency (WUEi). Results showed significant effect of sites and species for DL and the leaf attributes. Average DL across the four tree species was greater at Chunar, whereas, the average values of leaf attributes were greater at the BHU campus. Maximum DL was observed for Tectona grandis at Chunar site and minimum for Syzygium cumini at BHU campus. Across the two sites, maximum value of SLA, Chl and Gsmax were exhibited by S. cumini, whereas, the greatest value of RWC, LNC, LPC, A max and WUEi were observed in Anthocephalus cadamba. A. cadamba and S. cumini exhibited 28 and 27 times more dust accumulation, respectively, at the most polluted Chunar site as compared to the BHU campus. They also exhibited less reduction in A max due to dust deposition as compared to the other two species. Therefore, both these species may be promoted for plantation along the roadside of the sites having greater dust deposition. 相似文献
95.
Shikha Raghuwanshi M. G. H. Zaidi Saurabh Kumar Reeta Goel 《Journal of Polymers and the Environment》2018,26(7):2661-2675
The global demand of bioplastics has lead to an exponential increase in their production commercially. Hence, biodegradable nature needs to be evaluated in various ecosystems viz. air, water, soil and other environmental conditions to avoid the polymeric waste accumulation in the nature. In this paper, we investigated the progressive response of two indigenously developed bacterial consortia, i.e., consortium-I (C-I: Pseudomonas sp. strain Rb10, Pseudomonas sp. strain Rb11 and Bacillus sp. strain Rb18), and consortium-II (C-II: Lysinibacillus sp. strain Rb1, Pseudomonas sp. strain Rb13 and Pseudomonas sp. strain Rb19), against biodegradation behavior of polyhydroxybutyrate (PHB) film composites, under natural soil ecosystem (in net house). The biodegraded films recovered after 6 and 9 months of incubation were analyzed through Fourier transform infrared spectroscopy and scanning electron microscopy to determine the variations in chemical and morphological parameters (before and after incubation). Noticeable changes in the bond intensity, surface morphology and conductivity were found when PHB composites were treated with C-II. These changes were drastic in case of blends in comparison to copolymer. The potential isolates not only survived, but, also, there was a significant increase in bacterial diversity during whole period of incubation. To the best of our knowledge, it is the first report which described the biodegradation potential of Lysinibacillus sp. as a part of C-II with Pseudomonas sp. against PHB film composites. 相似文献
96.
Kishore?Kumar?MahatoEmail author Krishna?Dutta Bankim?Chandra?Ray 《Journal of Polymers and the Environment》2018,26(3):1024-1050
The study of static and dynamic behavior of environmentally conditioned fibre reinforced polymeric (FRP) composites is necessary and crucial to examine the durability, reliability and sustainability of these noble materials. FRP composites are being used all around the globe and substituting the conventional materials, starting from mini toys to large aerospace components. Present review has introduced to accumulate and understand the disseminate literature in concentrating the significance of understanding the static and dynamic behavior of FRPs with changing environmental conditionings (hygrothermal, low and high temperature, salt solution, freeze thaw, UV light) and with the interaction of different nano-fillers. Their stability and integrity in diverse service environments may be reformed by their reactions against different nature of loadings i.e. static or dynamic and the components such as fibre, matrix and fibre/matrix interfaces in those environments. The static and dynamic states of loading may come with a possible weaker region to encounter the durability and integrity of the composites. To understand the exact failure modes that correlates the position of environmentally conditioned interfaces and dynamic state of loadings, thus confusing the estimation of its overall performance and mechanical behavior. Interface reliability and durability is vital since in-service environments the degradation in the interfacial region leads to complete composite failure. Therefore, the study of combined effects of various in-service environmental conditions and the role of static and dynamic behavior on the interface will be a crucial part related to the multiaxial dynamic states of failures occurring in FRP’s. 相似文献
97.
Abioye?O.?FayigaEmail authorView authors OrcID profile Mabel?O.?Ipinmoroti Tait?Chirenje 《Environment, Development and Sustainability》2018,20(1):41-63
Mining and minerals industries are fast-growing, but at the same time, they have gained more attention due to their impacts over the environment and society. This research aims to provide new insights into the topic of perception and awareness toward sustainability in industrial mining in Brazil. The work included in-depth interviews with a set of companies’ managers/directors focusing in particular on aspects related to the social and environmental dimensions, including communication and relationship with the community, impact assessment and mitigation strategies. The knowledge and use of for formal indicators was also evaluated and analyzed through the proposed Model for Sustainability Assessment of Mining (SAoM model), which was applied to all participating companies. The results put in evidence the existing gap between large and small companies, with these last ones showing lower awareness for the impacts of their activities. The lack of community engagement and of local stakeholders’ involvement, as well as the disregard for actions to mitigate their environmental and social impacts, is the main challenges to be overcome by this sector. The sector has then a long path to go toward sustainability and an active involvement of public institutions is required to allow for its development without compromising locals welfare. 相似文献
98.
Making spatial development scenario for south of Bushehr province,Iran, based on strategic foresight
Sheida?AbdoliEmail author Farah?Habib Mohammad?Babazadeh 《Environment, Development and Sustainability》2018,20(3):1293-1309
In recent years, the science of foresight has been entered into planning activities by urban and regional planners and this science has impacted on planning activities. This study discusses spatial development in the south of Bushehr province using the foresight approach. The general aim of this research is to compile scenarios for the development of the mentioned study area which comprises the southern part of Bushehr province including four counties of Dayyer, Jam, Kangan and Asaluyeh. The main reason for selecting this region is their direct impressibility by major changes in the country’s oil and gas industry. This research has extremely made use of the Delphi and cross-impact analysis methods to develop foresight scenarios. Using the Delphi method, 30 initial factors were identified in the economic, political-security, linkages, science and technology, manufacturing, natural, social, infrastructural and residential issues and then the cross-impact matrix was used to investigate the impact of factors on each other. In the next step, the ranking of direct and indirect factors was determined by Micmac software and on this basis, the final refining in the selection of drivers was done. In the final stage, axes of future scenarios were presented and then the future scenarios were drawn. Results of this research indicate that two main drivers namely Iran’s international relations and energy resources are the main axes of scenarios. These two drivers have more uncertainty and higher importance than other factors and the results in four scenarios showing the possibility of each situation’s occurrence. 相似文献
99.
A.?K.?GoraiEmail author S.?S.?Biswal Gargi?Mitra 《Environment, Development and Sustainability》2018,20(4):1461-1481
The present study aims to analyse the influences of five meteorological parameters (temperature, wind speed, barometric pressure, rainfall, and solar radiations) on ground-level ozone (GLO) concentrations over the region of Ranchi Municipal Corporation (Jharkhand, India). The diurnal variation of GLO concentration and the meteorological parameters were analysed in each month to understand the associations. The results indicated that the correlation coefficients of GLO concentration with SR, AT, and DPT are found to be positive in each month and also statistically significant. But, the association between WS and GLO concentration was not uniform between the study days. Furthermore, the study also demonstrates an approach for identifying the hot spots that are having the higher level of GLO concentration. The hot spot maps were produced for each month to understand the shifting of the locations of hot spot locations. The results reveal that the hot spot locations are changes frequently in each case. Since the hot spot analysis was conducted with limited data, the presented hot spots are indicative and dependent on the meteorological conditions of the specific period and cannot be considered as a robust epidemiological study. 相似文献
100.
Miqdam?T.?ChaichanEmail author Hussien?A.?Kazem Talib?A.?Abed 《Environment, Development and Sustainability》2018,20(2):589-603
In Iraq, the number of passenger cars, trucks and buses, local generators, and heavy construction equipment rose to a considerable extent since 2003, causing high environmental problems. Many types of pollutants were monitored and recorded for 24 h during March 2016. The study attempts to explore and establish a relationship between the volume of activity and the movement of motor vehicles of various compounds and contaminants resulting from their exhaust pipes, such as sulfur dioxide, particulate matters, oxides of nitrogen, VOCs, and unburned hydrocarbons. The study focused in and around Mohammad Al-Qasim highway adjacent to the University of Technology, Baghdad. The results showed the need for urgent treatments addressed by the environmental authorities in the city. The study results demonstrated that these contaminants are increased during periods of the beginning and end of working hours for government departments. Some types of sulfur compounds (H2S and SO2) concentrations were at serious health-threatening levels, which is a result of the high sulfur content in the Iraqi fuel. The concentrations of NOx and VOC were high, also, which could make the studied area vulnerable to the risk of smog formation. The Iraqi government should make greater efforts to protect the environment and human in this country from the transportation pollution risks. 相似文献