全文获取类型
收费全文 | 164篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 5篇 |
环保管理 | 20篇 |
综合类 | 4篇 |
基础理论 | 35篇 |
环境理论 | 2篇 |
污染及防治 | 61篇 |
评价与监测 | 32篇 |
社会与环境 | 7篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 12篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 26篇 |
2012年 | 7篇 |
2011年 | 8篇 |
2010年 | 12篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 13篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1994年 | 5篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1966年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有168条查询结果,搜索用时 218 毫秒
101.
Chandra Prakash Kala 《国际发展与全球生态学杂志》2013,20(2):205-210
The various indigenous uses and structure of chir pine forests were studied in Uttaranchal state of the Indian Republic. A questionnaire survey was conducted in 50 villages of Uttaranchal to gather information on the indigenous uses of chir pine. For the study of community composition and structure of chir pine forest, at least 15 quadrats of 10 x 10 m were selected randomly across various localities, and the number of individuals, along with other dominant tree and shrub species, were enumerated in each quadrat. About 10 indigenous uses of chir pine were prominent in Uttaranchal. Besides resin, an important non-wood product, different parts of chir pine, such as cones, trunk, stems, wood, leaves and bark, were used by the local people. Chir pine is a subject of the folklore and mythology of indigenous cultures in Uttaranchal. Chir pine forest formed three major communities in Uttaranchal viz., sal-pine (Shorea robusta-Pinus roxburghii), pine pure stands and oak-pine (Quercus leucho-trichophora-Pinus roxburghii). These communities sustained various multiple-use trees and shrubs along with various edible mushrooms (eg. Agaricus campestris, Morchella esculenta and Sparassis crispa). The results of this study are discussed in the light of chir pine conservation and management policies. 相似文献
102.
Glenn Burkhardt Anand Prakash 《Journal of the American Water Resources Association》1976,12(6):1245-1258
ABSTRACT: A convenient method for the statistical analysis of hydrologic extremes is to use probability papers to fit selected theoretical distributions to extremal observations. Three commonly accepted statistical distributions of extreme hydrologic events are: the double exponential distribution, the bounded exponential distribution, and the Log Pearson Type III distribution. In most cases, probability papers are distribution specific. But, for the Log Pearson Type III distribution, the probability paper is characterized by a population-specific parameter, namely, the coefficient of skewness. It is not practicable to procure probability papers for all possible values of this parameter. Therefore, a computer program is developed to generate population-specific probability papers and to perform statistical analysis of the data using computer graphics. Probability papers covering return periods up to 1000 years or more are generated for the three distributions mentioned above. Using a plot routine, available extremal observations are plotted on selected probability papers and a linear regression analysis is used to fit a straight line to the data. Predictions of hydrologic extremes for higher recurrence intervals can be made by extrapolating the fitted straight lines. 相似文献
103.
Sarita Sinha Manisha Gupta Prakash Chandra 《Environmental monitoring and assessment》1994,33(1):75-84
Accumulation of Cu and Cd by Vallisneria spiralis was studied under laboratory conditions. Plants showed ability to reduce 5 µg ml–1 Cu background concentration to below 0.05 µg ml–1 (m.p.l., WHO 1985) within 48 h. The Cd concentration of 1.0 µg ml–1 was reduced to below m.p.l. (0.005 µg ml–1) in 168 h. Cysteine synthesis was more under Cd stress condition. Both the metals were toxic to the plants at higher concentrations; more in the case of Cd.NBRI Rsearch Publication No. 417 (N.S.). 相似文献
104.
Rohit Shrivastav Sanjay Kumar Mathur Shobhit Shrivastav M. M. Shrivastav Sahab Das Satya Prakash 《Environmental monitoring and assessment》1996,40(3):271-278
Peat, ice deposits and aquatic sediments, which have been used as a geochemical monitor of atmospheric heavy metal pollution until now, are open and dynamic systems and can be easily affected by climatic variations. In contrast, bricks, which are more compact, can act as a better geochemical monitor. Analysis of Cu, Cr, Ni, Pb and Zn in scores of soil and brick (baked/unbaked) samples, collected from a large area in and around a rapidly growing Indian city, Agra, reveals approximately similar concentrations in soils and bricks, thereby showing insignificant fractionation of these metals during brick making. Further, metals concentration in the core of bricks remains unaffected by any significant amount of acidic and alkaline rain. Thus, the feasibility of a novel role of bricks as a geochemical monitor of atmospheric heavy metal pollution has been tested. Utilizing this concept, an attempt has also been made to trace the history of atmospheric copper depositions in the soils of Agra during the last 100 years. 相似文献
105.
Kumar Sarangi Prakash Subudhi Sanjukta Bhatia Latika Saha Koel Mudgil Divya Prasad Shadangi Krushna Srivastava Rajesh K. Pattnaik Bhabjit Arya Raj Kumar 《Environmental science and pollution research international》2023,30(4):8526-8539
Environmental Science and Pollution Research - The major global concern on energy is focused on conventional fossil resources. The burning of fossil fuels is an origin of greenhouse gas emissions... 相似文献
106.
Brian Greenhill Nives Dolšak Aseem Prakash 《Environmental Communication: A Journal of Nature and Culture》2018,12(7):911-927
Can information about adaptation costs influence citizens’ willingness to support climate change mitigation? Some scholars are concerned that policy discussions on adaptation might present climate change as a more manageable problem, and therefore crowd out mitigation efforts. On the other hand, providing information on adaptation costs may sensitize citizens to these costs, thereby increasing their willingness to support mitigation. To assess these conflicting predictions, we fielded a web-based survey experiment using a sample of 2,000 US-based respondents. We presented the respondents with a hypothetical newspaper article regarding a proposed gasoline tax (a mitigation strategy) and measured the support for this proposal across different treatment groups. In the control group, the respondents were told that failure to mitigate climate change could result in a potentially catastrophic outcome, whereas in each of the treatment groups the respondents were provided with information concerning possible adaptation costs. The respondents were then asked about their willingness to support a gasoline tax. Our key finding is that the provision of information about adaptation costs leads to a small increase in the respondents’ willingness to support mitigation efforts. Furthermore, we find that this effect becomes larger when the information regarding adaptation costs is made more specific. 相似文献
107.
108.
Periakaruppan Prakash Abraham Rajan Mahendran Karthikeyan Ramanathan Murugappan 《Environmental Chemistry Letters》2018,16(3):1063-1067
Environmental Chemistry Letters - The hydrazone moiety is a major function in medicinal chemistry because of its wide range of pharmacological applications. Actual synthetic procedures usually... 相似文献
109.
This paper compares an existing unreliable grid supply with a proposed PV–biodiesel hybrid energy system in order to find the feasibility of the latter for improvement in reliability of power supply, lower pollutant emissions and saving of coal reserves. In the present study, the electrical load of a cement technology institute located in Bhilai, India, has been selected for the purpose of analysis. The results show that hybrid PV–biodiesel system comprising 25 kW PV array, 8 kW biodiesel generator-1, 20 kW biodiesel generator-2, 10 kW inverter and 10 kW rectifier will supply power to the institute avoiding addition of 27.744 tons of CO2 in atmosphere and save 55,080 kg of coal per year with improvement in reliability from 93.15 to 100%. 相似文献
110.
Venkatesha Raju K Somashekar RK Prakash KL 《Environmental monitoring and assessment》2012,184(1):361-373
The purpose of this research work was to appraise extent of heavy metals in sediment and the degree to which its quality tainted
seasonally and spatially in river Cauvery. In this study, heavy metals such as Fe, Zn, Ni, Mn, Pb, Cu, Co, Cd and Cr were
analysed in sediments. Results were compared with sediment quality guidelines from various derived criteria. Twenty-five sampling
points were selected based on geographical proximity of agricultural fields and industrial discharges; river-tributary confluence
points; settlements located along the river bank; ritual and recreational activities. Sampling was done for the period of
3 years (2007 to 2009). Digestion of the samples was done by microwave-assisted digestion technique. Analysis was carried
out using flame furnace atomic absorption spectrophotometer, and results are expressed in micrograms per gram. The mean concentration
of Fe (11144 μg/g) followed by Mn (1763.3 μg/g), Zn (93.1 μg/g), Cr (389 μg/g), Ni (27.7 μg/g), Cu (11.2 μg/g), Pb (4.3 μg/g),
Co (1.9 μg/g) and Cd (1.3 μg/g) remained within the levels of sediment quality guidelines. Multivariate statistical techniques
such as principal component analysis and cluster analysis (CA) were employed to better comprehend the controlling factors
of sediment quality and spatial homogeneity among the stations. The sediment geo-accumulation index (Igeo) showed maximum value of Cd (2.69) and least value of Mn (−1.44). The geo-accumulation class (Igeo class) was in the sequence as follows: Cd>Zn>Pb>Cr>Cu>Co>Ni>Fe>Mn. Negative total geo-accumulation indices (Itot) revealed that mean concentration of heavy metals in the river bed sediment are lower than their respective shale values.
The statistical analysis of inter-metallic relationship revealed the high degree of correlation among the metals indicated
their identical behaviour during transport. This study concludes that insignificant geo-accumulation with metals except Cd
(moderate contamination), Pb and Zn (slight contamination) principally in downstream stretch may perhaps deteriorate the sediment
quality due to intensification anthropogenic influences. It also proves that extent of existing metal concentrations in sediments
of river Cauvery in Karnataka not exceeded the toxic limit, and there is no peril to the aquatic life. 相似文献