全文获取类型
收费全文 | 12782篇 |
免费 | 151篇 |
国内免费 | 101篇 |
专业分类
安全科学 | 371篇 |
废物处理 | 487篇 |
环保管理 | 1880篇 |
综合类 | 2183篇 |
基础理论 | 3347篇 |
环境理论 | 8篇 |
污染及防治 | 3221篇 |
评价与监测 | 793篇 |
社会与环境 | 652篇 |
灾害及防治 | 92篇 |
出版年
2023年 | 72篇 |
2022年 | 110篇 |
2021年 | 106篇 |
2020年 | 92篇 |
2019年 | 99篇 |
2018年 | 184篇 |
2017年 | 168篇 |
2016年 | 250篇 |
2015年 | 217篇 |
2014年 | 297篇 |
2013年 | 971篇 |
2012年 | 393篇 |
2011年 | 540篇 |
2010年 | 445篇 |
2009年 | 519篇 |
2008年 | 566篇 |
2007年 | 569篇 |
2006年 | 500篇 |
2005年 | 453篇 |
2004年 | 384篇 |
2003年 | 401篇 |
2002年 | 385篇 |
2001年 | 492篇 |
2000年 | 374篇 |
1999年 | 223篇 |
1998年 | 149篇 |
1997年 | 170篇 |
1996年 | 182篇 |
1995年 | 208篇 |
1994年 | 209篇 |
1993年 | 170篇 |
1992年 | 142篇 |
1991年 | 172篇 |
1990年 | 166篇 |
1989年 | 169篇 |
1988年 | 121篇 |
1987年 | 126篇 |
1986年 | 123篇 |
1985年 | 97篇 |
1984年 | 113篇 |
1983年 | 116篇 |
1982年 | 127篇 |
1981年 | 112篇 |
1980年 | 98篇 |
1979年 | 119篇 |
1978年 | 77篇 |
1977年 | 79篇 |
1975年 | 77篇 |
1973年 | 72篇 |
1967年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Igliski B. Skrzatek M. Kujawski W. Cichosz M. Buczkowski R. 《Environment, Development and Sustainability》2022,24(1):77-111
Environment, Development and Sustainability - Renewable energy (RE) plays an increasingly important role in the economy of almost every country in the world. In order to examine the state of... 相似文献
12.
Summary As stated at the beginning of this paper conclusions reached thus far cannot be discussed in this paper. However, a great deal of information is available for examination.EPA displayed its ability to coordinate widely separated laboratories, both Federal and private, into a smooth working team in a very short period of time. A very comprehensive study plan was also developed and implemented quickly. EPA was fortunate to have already had GCA under contract when the emergency arose. In no small part the success of the field effort was due to the managerial and technical abilities of the GCA team.Within a period of 6 weeks a plan was developed, a prime contractor retained, subcontractors hired, and field activities begun. Within a period of 3 months in excess of 8600 field samples were collected and over 12,000 field and QC samples were analyzed. During this same period 2 major data systems were developed, debugged, and placed into operation.In short this EPA project was probably the most comprehensive multimedia field project ever attempted by EPA and certainly the data is being subjected to the most strenuous quality control measures ever imposed by this Agency. The entire program is presently under peer review and the results are being prepared for publication by EPA Headquarters.Note. Originally intended to be published as part of the special issue on Exposure Monitoring: An International Workshop (Las Vegas, Nevada, October 19–22, 1981). 相似文献
13.
14.
15.
16.
17.
18.
19.
20.
Mechanics and Morphology of Silk Drawn from Anesthetized Spiders 总被引:1,自引:0,他引:1
CO2 and N2 anesthetized Nephila spiders produced dragline silk with mechanical properties that differed from control silk as a function of time under anesthesia.
Silk from CO2 spiders had a significantly lower breaking strain and breaking energy, significantly higher initial modulus, and marginally
lower breaking stress. At the onset of anesthesia the silk diameter became highly variable. During deep anesthesia silk either
became thinner or retained cross-section but fibrillated.
Received: 26 August 1999 / Accepted in revised form: 22 December 1999 相似文献