全文获取类型
收费全文 | 9833篇 |
免费 | 112篇 |
国内免费 | 94篇 |
专业分类
安全科学 | 273篇 |
废物处理 | 460篇 |
环保管理 | 1243篇 |
综合类 | 1195篇 |
基础理论 | 2667篇 |
环境理论 | 2篇 |
污染及防治 | 2773篇 |
评价与监测 | 711篇 |
社会与环境 | 667篇 |
灾害及防治 | 48篇 |
出版年
2022年 | 96篇 |
2021年 | 75篇 |
2020年 | 65篇 |
2019年 | 72篇 |
2018年 | 145篇 |
2017年 | 139篇 |
2016年 | 229篇 |
2015年 | 164篇 |
2014年 | 237篇 |
2013年 | 744篇 |
2012年 | 296篇 |
2011年 | 441篇 |
2010年 | 364篇 |
2009年 | 396篇 |
2008年 | 470篇 |
2007年 | 475篇 |
2006年 | 423篇 |
2005年 | 367篇 |
2004年 | 324篇 |
2003年 | 378篇 |
2002年 | 324篇 |
2001年 | 503篇 |
2000年 | 329篇 |
1999年 | 191篇 |
1998年 | 136篇 |
1997年 | 129篇 |
1996年 | 138篇 |
1995年 | 162篇 |
1994年 | 125篇 |
1993年 | 102篇 |
1992年 | 123篇 |
1991年 | 119篇 |
1990年 | 130篇 |
1989年 | 130篇 |
1988年 | 94篇 |
1987年 | 87篇 |
1986年 | 65篇 |
1985年 | 90篇 |
1984年 | 89篇 |
1983年 | 86篇 |
1982年 | 82篇 |
1981年 | 73篇 |
1980年 | 61篇 |
1979年 | 68篇 |
1977年 | 53篇 |
1976年 | 48篇 |
1975年 | 53篇 |
1974年 | 51篇 |
1973年 | 53篇 |
1970年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
R. Cossu S. Fiore T. Lai A. Luciano G. Mancini B. Ruffino P. Viotti M.C. Zanetti 《Waste management (New York, N.Y.)》2014,34(10):1752-1762
Automotive Shredder Residue (ASR) is a special waste that can be classified as either hazardous or non hazardous depending on the amount of hazardous substances and on the features of leachate gathered from EN12457/2 test. However both the strict regulation concerning landfills and the EU targets related to End-of-Life Vehicles (ELVs) recovery and recycling rate to achieve by 2015 (Directive 2000/53/EC), will limit current landfilling practice and will impose an increased efficiency of ELVs valorization. The present paper considers ELVs context in Italy, taking into account ASRs physical–chemical features and current processing practice, focusing on the enhancement of secondary materials recovery. The application in waste-to-energy plants, cement kilns or metallurgical processes is also analyzed, with a particular attention to the possible connected environmental impacts. Pyrolysis and gasification are considered as emerging technologies although the only use of ASR is debatable; its mixing with other waste streams is gradually being applied in commercial processes. The environmental impacts of the processes are acceptable, but more supporting data are needed and the advantage over (co-)incineration remains to be proven. 相似文献
102.
F. Ravera A. Scheidel J. dell’Angelo G. Gamboa T. Serrano S. Mingorría V. Cabello N. Arizpe P. Ariza 《Environment, Development and Sustainability》2014,16(4):811-820
While rural transformations are nothing new in human history, current processes of rural change occur under multiple forces at an unprecedented pace, involving profound and unexpected changes in land use and users, and rapid transformations in the metabolic patterns of rural systems. The present special section aims to shed light on current drivers and pathways of rural change by analyzing, under a common conceptual and theoretical framework, examples of new ruralities that are emerging as responses across different world regions. Within this context, this introduction presents: (1) common research questions of the six presented cases of rural change; (2) the general theoretical and methodological framework of integrated assessment of societal metabolism adopted to analyze rural systems and (3) the main contributions and conclusions that could be drawn from six context-specific case studies from Asia, Latin America and Europe. 相似文献
103.
Consideration is given to changes in the vegetation and climatic conditions on the eastern slope of the Northern Urals in the second half of the Holocene as reconstructed on the basis of integrated palynological, botanical, paleocarpological, and radiocarbon analysis of material from a peat bog section in the floodplain of the Loz’va River. The results show that the northern taiga zone of the study region in the period between approximately 5000 and 700 years BP was occupied by forests of southern taiga facies, as the climate was significantly warmer than it is today. 相似文献
104.
V. A. Mukhin P. Yu. Voronin T. A. Velivetskaya A. V. Ignat’ev 《Russian Journal of Ecology》2014,45(1):11-17
Data on the ratio of stable carbon isotopes in xylotrophic fungi and their xylic substrates are presented for the first time. It is shown that coniferous substrates are more enriched in the heavy carbon isotope, compared to deciduous substrates. In both cases, however, their carbon isotope composition is characterized by low variability and does not correlate with the species or physiological type of decomposer fungus but shows a statistically significant correlation with the degree of wood mineralization. The ratio of stable carbon isotopes in the fungi depends on that in their substrates but is shifted in favor of the heavier isotope. This trophic shift lacks species specificity, is equally manifested in decomposers of deciduous and coniferous substrates, remains unchanged along the latitudinal climatic gradient, and is positively correlated with the carbon isotope composition of substrates, in the absence of correlation with the degree of their mineralization. 相似文献
105.
Analysis of the concentrations of chemical elements and the composition of diatoms in the surface layer of bottom sediments has been performed in a small reservoir at the mouth of dammed river to evaluate the levels of pollution and the impact of toxicants on diatom communities of the river ecosystem. Data on interrelations between the concentrations of chemical elements and the relationship between inorganic pollution and accumulation of diatoms in bottom sediments as an indicator of development of the diatom assemblage have been obtained using linear correlation analysis and graphical plotting. 相似文献
106.
G. V. Vorobyev A. Yu. Alyabyev T. I. Ogorodnikova A. F. Khamidullin V. N. Vorobyev 《Russian Journal of Ecology》2014,45(2):90-94
Microcalorimetric, gasometric, and nuclear magnetic resonance (NMR) methods have been used to evaluate heat production, gas exchange, and root membrane permeability in dandelion of different morphological forms from populations exposed to different levels of air pollution. The results show that these forms differ in the level of energy metabolism and that the form with a higher metabolic level (T. off. f. dahlstedtii) is more tolerant of air pollution with motor vehicle exhausts. 相似文献
107.
Yang-ying Zhao Fan-xin Kong Zhi Wang Hong-wei Yang Xiao-mao Wang Yuefeng F. Xie T. David Waite 《Frontiers of Environmental Science & Engineering》2017,11(6):20
This study was conducted to assess the merits and limitations of various high-pressure membranes, tight nanofiltration (NF) membranes in particular, for the removal of trace organic compounds (TrOCs). The performance of a low-pressure reverse osmosis (LPRO) membrane (ESPA1), a tight NF membrane (NF90) and two loose NF membranes (HL and NF270) was compared for the rejection of 23 different pharmaceuticals (PhACs). Efforts were also devoted to understand the effect of adsorption on the rejection performance of each membrane. Difference in hydrogen bond formation potential (HFP) was taken into consideration. Results showed that NF90 performed similarly to ESPA1 with mean rejection higher than 95%. NF270 outperformed HL in terms of both water permeability and PhAC rejection higher than 90%. Electrostatic effects were more significant in PhAC rejection by loose NF membranes than tight NF and LPRO membranes. The adverse effect of adsorption on rejection by HL and ESPA1 was more substantial than NF270 and NF90, which could not be simply explained by the difference in membrane surface hydrophobicity, selective layer thickness or pore size. The HL membrane had a lower rejection of PhACs of higher hydrophobicity (log D>0) and higher HFP (>0.02). Nevertheless, the effects of PhAC hydrophobicity and HFP on rejection by ESPA1 could not be discerned. Poor rejection of certain PhACs could generally be explained by aspects of steric hindrance, electrostatic interactions and adsorption. High-pressure membranes like NF90 and NF270 have a high promise in TrOC removal from contaminated water. 相似文献
108.
Kharuk Viacheslav I. Im Sergei T. Petrov Ilya A. Dvinskaya Mariya L. Fedotova Elena V. Ranson Kenneth J. 《Regional Environmental Change》2017,17(3):803-812
Regional Environmental Change - Increased dieback and mortality of “dark needle conifer” (DNC) stands (composed of fir (Abies sibirica), Siberian pine (Pinus sibirica) and spruce (Picea... 相似文献
109.
RACHEL T. BUXTON CHRISTOPHER JONES HENRIK MOLLER DAVID R. TOWNS 《Conservation biology》2014,28(2):333-344
Eradication of introduced mammalian predators from islands has become increasingly common, with over 800 successful projects around the world. Historically, introduced predators extirpated or reduced the size of many seabird populations, changing the dynamics of entire island ecosystems. Although the primary outcome of many eradication projects is the restoration of affected seabird populations, natural population responses are rarely documented and mechanisms are poorly understood. We used a generic model of seabird colony growth to identify key predictor variables relevant to recovery or recolonization. We used generalized linear mixed models to test the importance of these variables in driving seabird population responses after predator eradication on islands around New Zealand. The most influential variable affecting recolonization of seabirds around New Zealand was the distance to a source population, with few cases of recolonization without a source population ≤25 km away. Colony growth was most affected by metapopulation status; there was little colony growth in species with a declining status. These characteristics may facilitate the prioritization of newly predator‐free islands for active management. Although we found some evidence documenting natural recovery, generally this topic was understudied. Our results suggest that in order to guide management strategies, more effort should be allocated to monitoring wildlife response after eradication. Conductores de la Recuperación de Poblaciones de Aves Marinas en Islas de Nueva Zelanda después de la Erradicación de Depredadores 相似文献
110.
Maurer Edwin P. Roby Nicholas Stewart-Frey Iris T. Bacon Christopher M. 《Regional Environmental Change》2017,17(8):2421-2432
Regional Environmental Change - In addition to periodic long-term drought, much of Central America experiences a rainy season with two peaks separated by a dry period of weeks to over a month in... 相似文献