全文获取类型
收费全文 | 2326篇 |
免费 | 142篇 |
国内免费 | 696篇 |
专业分类
安全科学 | 182篇 |
废物处理 | 115篇 |
环保管理 | 187篇 |
综合类 | 1340篇 |
基础理论 | 373篇 |
环境理论 | 1篇 |
污染及防治 | 655篇 |
评价与监测 | 112篇 |
社会与环境 | 108篇 |
灾害及防治 | 91篇 |
出版年
2024年 | 3篇 |
2023年 | 44篇 |
2022年 | 144篇 |
2021年 | 117篇 |
2020年 | 85篇 |
2019年 | 64篇 |
2018年 | 91篇 |
2017年 | 106篇 |
2016年 | 90篇 |
2015年 | 114篇 |
2014年 | 174篇 |
2013年 | 227篇 |
2012年 | 172篇 |
2011年 | 185篇 |
2010年 | 157篇 |
2009年 | 130篇 |
2008年 | 159篇 |
2007年 | 106篇 |
2006年 | 125篇 |
2005年 | 85篇 |
2004年 | 64篇 |
2003年 | 88篇 |
2002年 | 100篇 |
2001年 | 93篇 |
2000年 | 67篇 |
1999年 | 66篇 |
1998年 | 73篇 |
1997年 | 51篇 |
1996年 | 42篇 |
1995年 | 30篇 |
1994年 | 36篇 |
1993年 | 31篇 |
1992年 | 16篇 |
1991年 | 8篇 |
1990年 | 7篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有3164条查询结果,搜索用时 764 毫秒
771.
772.
773.
Bernhard G. Zimmermann Simon Grill Wolfgang Holzgreve Xiao Yan Zhong Laird G. Jackson Sinuhe Hahn 《黑龙江环境通报》2008,28(12):1087-1093
Recent reports have indicated that digital PCR may be useful for the noninvasive detection of fetal aneuploidies by the analysis of cell-free DNA and RNA in maternal plasma or serum. In this review we provide an insight into the underlying technology and its previous application in the determination of the allelic frequencies of oncogenic alterations in cancer specimens. We also provide an indication of how this new technology may prove useful for the detection of fetal aneuploidies and single gene Mendelian disorders. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
774.
Zeng Weihua Zhong Xiaohong Xue Pengli . State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing China . China’s Academy of Environmental Planning State Environmental Protection Administration Beijing 《中国人口.资源与环境(英文版)》2008,6(3):63-72
Intergenerational conflict coordination is the fundamental requirement and core of sustainable development. In this paper, through the analysis of the future generations-oriented management mechanisms for intergenerational conflict, the idea of mechanisms and institution building for the coordination and management of intergenerational conflict is put forward. Furthermore, the future generations-oriented virtual negotiation support system (NSS) for intergenerational conflict is developed, built on the analysis of the process simulation of intergenerational wealth transfer, intergenerational equilibrium allocation of resources, and strategies for the mitigation and avoidance of intergenerational conflict, through the application of advanced IT technology. The virtual NSS for intergenerational conflict is helpful to the practical application of the sustainable development theory; on the other hand, it can be applied directly to the intergenerational equilibrium allocation of resources, national economic accounting, formulation of sustainable development strategies and other urgent national economic and social development issues. Finally, the sustainable development theory can be enriched and extended. Therefore, the development of the future generations-oriented virtual NSS for intergenerational conflict has certain theoretical and practical effects on the theory of sustainable development. 相似文献
775.
Hydrologic risk analysis relies on a series of probabilistic analyses, and it is a complex problem in estimating the probability distributions of multiple independent and random variables. The goal of this study is to presents the procedure and application of a probability-based risk analysis methodology to evaluate earth dam overtopping risk that induced by concurrent flood and wind. The uncertainty arising from initial water surface level, flood, wind velocity, and dam height are discussed in this research. The improved Monte Carlo simulation and mean-value first-order second-moment method are used to solve the proposed dam overtopping risk model, respectively. The nonparametric kernel density estimation method, which can better learn the complex multimodal characteristic of probability density function than that of traditional parametric estimation method, is employed to improve the probability density function of initial water surface level. The latin hypercube sampling is introduced to generate uniform random number, which improves the efficient and stability compared with simple random sampling. Afterward, an application to the Dongwushi Reservoir in China illustrates that the dam overtopping risk computed using the improved Monte Carlo simulation is lower than that using mean-value first-order second-moment method. Furthermore, the sensitivity analysis show that initial water surface level is more sensitive to overtopping risk than wind velocity. 相似文献
776.
Rong Li Jing Wang Ailing Gu Yan Xu Jing Guo Jiafu Pan Yanhong Zeng Yuanlin Ma Canquan Zhou Yanwen Xu 《黑龙江环境通报》2021,41(6):681-689
777.
潘武龙 《安全.健康和环境》2021,21(7):58-60
以中央和中国石化集团公司对党的建设和安全生产、安全文化建设的要求为依据,指出加强安全文化建设的重要性,简要分析国有企业党建与安全文化之间的联系,提出在安全文化建设中发挥党建引领作用的路径和方法,不断推动安全生产和发展。 相似文献
778.
779.
780.