全文获取类型
收费全文 | 152篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
大气科学 | 8篇 |
地球物理 | 41篇 |
地质学 | 76篇 |
海洋学 | 6篇 |
天文学 | 19篇 |
自然地理 | 3篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 12篇 |
2012年 | 9篇 |
2011年 | 7篇 |
2010年 | 16篇 |
2009年 | 5篇 |
2008年 | 19篇 |
2007年 | 5篇 |
2006年 | 11篇 |
2005年 | 7篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有153条查询结果,搜索用时 968 毫秒
151.
152.
Rabah Bensalem Jean-Luc Chatelain Djamel Machane El Hadi Oubaiche Assia Bouchelouh Nassima Benkaci Hakim Moulouel Souhila Chabane Mustapha Hellel 《Arabian Journal of Geosciences》2017,10(13):282
Ambient vibrations have been continuously recorded at Dar El Beida, about 20 km from Algiers (Algeria). This data set allows determining that, in the low-frequency domain (<1 Hz), ambient vibration sources are mainly linked to Mediterranean Sea effects, while in the high-frequency domain, they are closely related to anthropogenic activity. Climatic conditions have an influence on the ambient vibration spectral amplitudes in the low-frequency domain, which is not the case in the high-frequency domain. The limit between the low-frequency and high-frequency domain, based on natural versus anthropogenic activity, is not clear cut and lies between 1.25 and 1.50 Hz. Variations of H/V peak amplitudes in the low-frequency domain are clearly linked to the climatic conditions. In the high-frequency domain, H/V peaks are not related to climatic conditions and cannot be clearly related to anthropogenic source changes. 相似文献
153.
In the Netherlands the current dike design policy is to design flood defence structures corresponding to an agreed flooding
probability with an extra safety board of at least 0.5 m. For river dikes a return period of 1,250 years is used to determine
the design water levels. A problem with this strategy is that it builds on assumptions with regard to the intrinsically uncertain
probability distributions for the peak discharges. The uncertainty is considerable and due to (1) the measuring records that
are limited to about 100 years and (2) the changing natural variability as a result of climate change. Although the probability
distributions are regularly updated based on new discharge data the nature of the statistics is such that a change in the
natural variability of the peak discharge affects the probability distribution only long after the actual change has happened.
Here we compare the performance of the probabilistic dike design strategy with the older strategy, referred to as the ‘self-learning
dike’. The basic principle of the latter strategy is that the dike height is kept at a level equal to the highest recorded
water level plus a certain safety margin. The two flood prevention strategies are compared on the basis of the flooding safety
over a 100-year period. The Rhine gauge station at Lobith serves as case study. The results indicate that the self-learning
dike performs better than the probabilistic design in terms of safety and costs, both under current and climate change conditions. 相似文献