全文获取类型
收费全文 | 50918篇 |
免费 | 559篇 |
国内免费 | 428篇 |
专业分类
安全科学 | 1644篇 |
废物处理 | 2189篇 |
环保管理 | 6944篇 |
综合类 | 7934篇 |
基础理论 | 13950篇 |
环境理论 | 28篇 |
污染及防治 | 12745篇 |
评价与监测 | 3269篇 |
社会与环境 | 2857篇 |
灾害及防治 | 345篇 |
出版年
2022年 | 406篇 |
2021年 | 441篇 |
2020年 | 305篇 |
2019年 | 402篇 |
2018年 | 735篇 |
2017年 | 739篇 |
2016年 | 1101篇 |
2015年 | 877篇 |
2014年 | 1313篇 |
2013年 | 4014篇 |
2012年 | 1601篇 |
2011年 | 2193篇 |
2010年 | 1814篇 |
2009年 | 1876篇 |
2008年 | 2231篇 |
2007年 | 2243篇 |
2006年 | 2044篇 |
2005年 | 1762篇 |
2004年 | 1729篇 |
2003年 | 1616篇 |
2002年 | 1588篇 |
2001年 | 1947篇 |
2000年 | 1374篇 |
1999年 | 869篇 |
1998年 | 685篇 |
1997年 | 680篇 |
1996年 | 726篇 |
1995年 | 798篇 |
1994年 | 691篇 |
1993年 | 635篇 |
1992年 | 654篇 |
1991年 | 627篇 |
1990年 | 592篇 |
1989年 | 633篇 |
1988年 | 542篇 |
1987年 | 467篇 |
1986年 | 450篇 |
1985年 | 464篇 |
1984年 | 484篇 |
1983年 | 503篇 |
1982年 | 526篇 |
1981年 | 432篇 |
1980年 | 368篇 |
1979年 | 406篇 |
1978年 | 343篇 |
1977年 | 288篇 |
1976年 | 285篇 |
1975年 | 292篇 |
1973年 | 301篇 |
1972年 | 300篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
311.
Aioub Ahmed A. A. Zuo Yayun Li Yankai Qie Xingtao Zhang Xianxia Essmat Nariman Wu Wenjun Hu Zhaonong 《Environmental science and pollution research international》2021,28(5):5101-5115
Environmental Science and Pollution Research - Cypermethrin (CYP) is a toxic manmade chemical compound belonging to pyrethroid insecticides contaminating the environment. Plantago major (PM) has... 相似文献
312.
Malki Zohair Atlam El-Sayed Ewis Ashraf Dagnew Guesh Ghoneim Osama A. Mohamed Abdallah A. Abdel-Daim Mohamed M. Gad Ibrahim 《Environmental science and pollution research international》2021,28(30):40496-40506
Environmental Science and Pollution Research - COVID-19 was first discovered in Wuhan, China in December 2019. It is one of the worst pandemics in human history. Recent studies reported that... 相似文献
313.
Vicente Estela Domingos Alves Célia A. Martins Vânia Almeida Susana Marta Lazaridis Mihalis 《Environmental science and pollution research international》2021,28(46):65385-65398
Environmental Science and Pollution Research - Residential settings are of utmost importance for human exposure, as it is where people spend most of their time. Residential wood combustion is a... 相似文献
314.
Denman AR Crockett RG Groves-Kirkby CJ Phillips PS Gillmore GK Woolridge AC 《Environment international》2007,33(1):34-44
Following an intensive survey of domestic radon levels in the United Kingdom (UK), the former National Radiological Protection Board (NRPB), now the Radiation Protection Division of the Health Protection Agency (HPA-RPD), established a measurement protocol and promulgated Seasonal Correction Factors applicable to the country as a whole. Radon levels in the domestic built environment are assumed to vary systematically and repeatably during the year, being generally higher in winter. The Seasonal Correction Factors therefore comprise a series of numerical multipliers, which convert a 1-month or 3-month radon concentration measurement, commencing in any month of the year, to an effective annual mean radon concentration. In a recent project undertaken to assess the utility of short-term exposures in quantifying domestic radon levels, a comparative assessment of a number of integrating detector types was undertaken, with radon levels in 34 houses on common geology monitored over a 12-month period using dose-integrating track-etch detectors exposed in pairs (one upstairs, one downstairs) at 1-month and 3-month resolution. Seasonal variability of radon concentrations departed significantly from that expected on the basis of the HPA-RPD Seasonal Correction Factor set, with year-end discontinuities at both 1-month and 3-month measurement resolutions. Following this study, monitoring with electrets was continued in four properties, with weekly radon concentration data now available for a total duration in excess of three and a half years. Analysis of this data has permitted the derivation of reliable local Seasonal Correction Factors. Overall, these are significantly lower than those recommended by HPA-RPD, but are comparable with other results from the UK and from abroad, particularly those that recognise geological diversity and are consequently prepared on a regional rather than a national basis. This finding calls into question the validity of using nationally aggregated Seasonal Correction Factors, especially for shorter exposures, and the universal applicability of these corrections is discussed in detail. 相似文献
315.
Disasters have the potential to act as focusing events, which can increase the amount of attention on disaster‐related problems and encourage policy action. Understanding of the political characteristics of disaster policymaking is underdeveloped, yet it is known that these features may be dissimilar to those of non‐disaster policy areas, especially concerning the coalitions of policy actors engaged in the disaster policy process. Coalitions in the realm of disaster policy processes may be less likely to form, may look very different, and may have different goals than those in non‐disaster domains. Knowledge of the emergence, composition, and purpose of coalitions in disaster policy is lacking. This paper draws on prior theory and case observations to define and describe the characteristics of a disaster policy subsystem and to build a typology of coalitions that may appear within such a subsystem, providing a foundation upon which scholars can work to study coalition dynamics in disaster policy subsystems. 相似文献
316.
Stephanie K. Drumheller Michelle R. Stocker Sterling J. Nesbitt 《Die Naturwissenschaften》2014,101(11):975-987
Hypotheses of feeding behaviors and community structure are testable with rare direct evidence of trophic interactions in the fossil record (e.g., bite marks). We present evidence of four predation, scavenging, and/or interspecific fighting events involving two large paracrocodylomorphs (=‘rauisuchians’) from the Upper Triassic Chinle Formation (~220–210 Ma). The larger femur preserves a rare history of interactions with multiple actors prior to and after death of this ~8–9-m individual. A large embedded tooth crown and punctures, all of which display reaction tissue formed through healing, record evidence of a failed attack on this individual. The second paracrocodylomorph femur exhibits four unhealed bite marks, indicating the animal either did not survive the attack or was scavenged soon after death. The combination of character states observed (e.g., morphology of the embedded tooth, ‘D’-shaped punctures, evidence of bicarination of the marking teeth, spacing of potentially serial marks) indicates that large phytosaurs were actors in both cases. Our analysis of these specimens demonstrates phytosaurs targeted large paracrocodylomorphs in these Late Triassic ecosystems. Previous distinctions between ‘aquatic’ and ‘terrestrial’ Late Triassic trophic structures were overly simplistic and built upon mistaken paleoecological assumptions; we show they were intimately connected at the highest trophic levels. Our data also support that size cannot be the sole factor in determining trophic status. Furthermore, these marks provide an opportunity to start exploring the seemingly unbalanced terrestrial ecosystems from the Late Triassic of North America, in which large carnivores far outnumber herbivores in terms of both abundance and diversity. 相似文献
317.
Shahrzad Saffari Ghandehari Shih-Huai Cheng Cathleen J. Hapeman Alba Torrents Birthe Veno Kjellerup 《补救:环境净化治理成本、技术与工艺杂志》2023,33(4):323-337
Trichloroethylene (TCE) is a toxic organic compound, which can adversely affect human health. The chemical is one of the most frequently found contaminants in groundwater in the United States and around the world. A landfill in Maryland contaminated with high levels of TCE decades ago was added to the U.S. Environmental Protection Agency's National Priority List (NPL) in 1994. A biowall was installed on the site in 2013 to promote the bioremediation of TCE and subsequently of its degradation products. Six-year monitoring data indicated a steady removal of >99% groundwater TCE at the wall since installation. However, a concurrent buildup of intermediate byproducts was observed downgradient of the wall. An examination of the entire system was necessary to find the reason behind the inefficiency of the biowall. In this study, the background of the site, remediation plan, and installation were assessed. Monitoring data, including the concentration of TCE and its degradation byproducts, and geochemical and physical characteristics were evaluated to understand the conditions and challenges facing decision-makers of this project and possible options to improve biowall efficacy. 相似文献
318.
Ormbsby Alison A. Felardo Jeff Musci Robert 《Environment, Development and Sustainability》2021,23(8):11636-11645
Environment, Development and Sustainability - Local residents near forests often collect non-timber forest products (NTFPs) for a variety of reasons, including food, medicine, firewood, religious... 相似文献
319.
Environment, Development and Sustainability - Good air quality is highly essential to the well-being of mankind, all living organisms and the environment. The quality of air is degrading at a... 相似文献
320.
Abdelnour Sameh A. Yang Chun-Yan Swelum Ayman A. Abd El-Hack Mohamed E. Khafaga Asmaa F. Abdo Mohamed Shang Jiang-Hua Lu Yang-Qing 《Environmental science and pollution research international》2020,27(31):38472-38490
Environmental Science and Pollution Research - Global warming is considered as the main environmental stress affecting ecosystems as well as physiological and biochemical characteristics, and... 相似文献