全文获取类型
收费全文 | 89590篇 |
免费 | 1226篇 |
国内免费 | 1108篇 |
专业分类
安全科学 | 3730篇 |
废物处理 | 3202篇 |
环保管理 | 13909篇 |
综合类 | 21068篇 |
基础理论 | 26131篇 |
环境理论 | 72篇 |
污染及防治 | 14347篇 |
评价与监测 | 5353篇 |
社会与环境 | 3576篇 |
灾害及防治 | 536篇 |
出版年
2022年 | 794篇 |
2021年 | 805篇 |
2020年 | 648篇 |
2019年 | 871篇 |
2018年 | 1120篇 |
2017年 | 1146篇 |
2016年 | 2153篇 |
2015年 | 1820篇 |
2014年 | 2576篇 |
2013年 | 9241篇 |
2012年 | 2129篇 |
2011年 | 2346篇 |
2010年 | 3238篇 |
2009年 | 3356篇 |
2008年 | 1918篇 |
2007年 | 1765篇 |
2006年 | 2213篇 |
2005年 | 2170篇 |
2004年 | 2550篇 |
2003年 | 2337篇 |
2002年 | 1889篇 |
2001年 | 2241篇 |
2000年 | 1973篇 |
1999年 | 1474篇 |
1998年 | 1364篇 |
1997年 | 1352篇 |
1996年 | 1470篇 |
1995年 | 1577篇 |
1994年 | 1476篇 |
1993年 | 1327篇 |
1992年 | 1328篇 |
1991年 | 1290篇 |
1990年 | 1242篇 |
1989年 | 1191篇 |
1988年 | 1046篇 |
1987年 | 980篇 |
1986年 | 990篇 |
1985年 | 1063篇 |
1984年 | 1156篇 |
1983年 | 1169篇 |
1982年 | 1176篇 |
1981年 | 1096篇 |
1980年 | 941篇 |
1979年 | 922篇 |
1978年 | 825篇 |
1977年 | 717篇 |
1976年 | 639篇 |
1975年 | 611篇 |
1973年 | 641篇 |
1972年 | 646篇 |
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
41.
Moonsammy Stephan Oyedotun Temitope D. Timothy Renn-Moonsammy Donna-Marie Oyedotun Temitayo Deborah Ally Nasrudeen Kasim Oluwasinaayomi Faith Famewo Ayomide 《Journal of Material Cycles and Waste Management》2021,23(4):1678-1687
Journal of Material Cycles and Waste Management - The novel COVID-19 pandemic has disrupted the functioning of solid waste management globally as households experience an increase in their waste... 相似文献
42.
Erica Marshall Roozbeh Valavi Louise O’ Connor Natasha Cadenhead Darren Southwell Brendan A. Wintle Heini Kujala 《Conservation biology》2021,35(2):567-577
Developers are often required by law to offset environmental impacts through targeted conservation actions. Most offset policies specify metrics for calculating offset requirements, usually by assessing vegetation condition. Despite widespread use, there is little evidence to support the effectiveness of vegetation-based metrics for ensuring biodiversity persistence. We compared long-term impacts of biodiversity offsetting based on area only; vegetation condition only; area × habitat suitability; and condition × habitat suitability in development and restoration simulations for the Hunter Region of New South Wales, Australia. We simulated development and subsequent offsetting through restoration within a virtual landscape, linking simulations to population viability models for 3 species. Habitat gains did not ensure species persistence. No net loss was achieved when performance of offsetting was assessed in terms of amount of habitat restored, but not when outcomes were assessed in terms of persistence. Maintenance of persistence occurred more often when impacts were avoided, giving further support to better enforce the avoidance stage of the mitigation hierarchy. When development affected areas of high habitat quality for species, persistence could not be guaranteed. Therefore, species must be more explicitly accounted for in offsets, rather than just vegetation or habitat alone. Declines due to a failure to account directly for species population dynamics and connectivity overshadowed the benefits delivered by producing large areas of high-quality habitat. Our modeling framework showed that the benefits delivered by offsets are species specific and that simple vegetation-based metrics can give misguided impressions on how well biodiversity offsets achieve no net loss. 相似文献
43.
44.
Francisco M. Baena-Moreno Mónica Rodríguez-Galán Fernando Vega Luis F. Vilches Benito Navarrete 《International Journal of Green Energy》2019,16(5):401-412
Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainable society. This paper presents a comprehensive list of biogas upgrading technologies focused on carbon dioxide removal as well as recent advances reported by researcher with wide expertise in this topic. Additionally, an extensive costs–performance comparison among the technologies studied is discussed. Among the different alternatives, chemical scrubbing stood out to achieve high biomethane purities while cryogenic technologies proved to be effective against methane losses. Regarding the different costs, water scrubbing and membrane separation seem to be the most affordable techniques. 相似文献
45.
46.
Catastrophic disasters like earthquake and flood cause widespread destruction and financial devastation. This has brought disaster management into limelight making it a burgeoning academic research field. The remarkable rise of ICT (Information and Communication Technology) has instigated the scientific world to incorporate these technologies in disaster management. This study presents scientometric analysis to identify the status quo of research on the management of various disasters and role of ICT in it. This paper uses bibliographic data retrieved from Scopus for the observation period from 2011 to 2018. We provide extensive insights into growth of publications, citation pattern and their connectedness with other subject disciplines. Furthermore, we identify most productive and influential countries, institutes and journals. Our study analyses co-occurrence of keywords using Visualization of Similarities (VOS) Viewer. This structured overview will enhance the understanding of this field leading to more focussed and purposeful research. 相似文献
47.
Maheswari C. Ramya A. S. Priya B. Meenakshi Sudhahar S. Prabhu Raj B. Lokesh B. Ramani G. 《Journal of Material Cycles and Waste Management》2021,23(6):2255-2265
Journal of Material Cycles and Waste Management - The present research work focused on fabricating Biodegradable Plate (BD plate) composed of rice husk ash, bagasse and corn starch which is... 相似文献
48.
49.
Quantitative methods have been applied to the study of floristic structure and diversity in Samarskaya Luka. The results show that Samarskaya Luka is a floristically heterogeneous area in which six elementary floras can be distinguished. This area has been assessed as a floristically autonomous formation, and its floristic representativeness was estimated. 相似文献
50.
Abstract: Introduction of artificial light into wildlife habitat represents a rapidly expanding form of human encroachment, particularly in coastal systems. Light pollution alters the behavior of sea turtles during nesting; therefore, long-wavelength lights—low-pressure sodium vapor and bug lights—that minimize impacts on turtles are required for beach lighting in Florida (U.S.A.). We investigated the effects of these two kinds of lights on the foraging behavior of Santa Rosa beach mice ( Peromyscus polionotus leucocephalus ). We compared patch use and giving-up densities of mice for experimental food patches established along a gradient of artificial light in the field. Mice exploited fewer food patches near both types of artificial light than in areas with little light and harvested fewer seeds within patches near bug lights. Our results show that artificial light affects the behavior of terrestrial species in coastal areas and that light pollution deserves greater consideration in conservation planning. 相似文献