全文获取类型
收费全文 | 1018篇 |
免费 | 220篇 |
国内免费 | 290篇 |
专业分类
测绘学 | 62篇 |
大气科学 | 225篇 |
地球物理 | 241篇 |
地质学 | 548篇 |
海洋学 | 178篇 |
天文学 | 62篇 |
综合类 | 110篇 |
自然地理 | 102篇 |
出版年
2024年 | 6篇 |
2023年 | 22篇 |
2022年 | 51篇 |
2021年 | 67篇 |
2020年 | 45篇 |
2019年 | 55篇 |
2018年 | 60篇 |
2017年 | 56篇 |
2016年 | 55篇 |
2015年 | 53篇 |
2014年 | 65篇 |
2013年 | 74篇 |
2012年 | 72篇 |
2011年 | 67篇 |
2010年 | 65篇 |
2009年 | 52篇 |
2008年 | 55篇 |
2007年 | 74篇 |
2006年 | 41篇 |
2005年 | 43篇 |
2004年 | 28篇 |
2003年 | 30篇 |
2002年 | 38篇 |
2001年 | 32篇 |
2000年 | 37篇 |
1999年 | 28篇 |
1998年 | 37篇 |
1997年 | 31篇 |
1996年 | 24篇 |
1995年 | 29篇 |
1994年 | 22篇 |
1993年 | 19篇 |
1992年 | 16篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 9篇 |
1988年 | 10篇 |
1987年 | 3篇 |
1986年 | 12篇 |
1985年 | 5篇 |
1984年 | 6篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1958年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有1528条查询结果,搜索用时 437 毫秒
1.
The geodynamic mechanism of the late Early Cretaceous magmatic flare‐up in the collisional zone between the Lhasa and Qiangtang terranes in Tibet is controversial because of a scarcity of robust evidence. To address this problem, we report geochronological, geochemical and Hf isotopic data for the newly discovered Gufeng gabbros from the Duolong Cu–Au mineral district of the western Bangong–Nujiang Suture Zone (BNSZ). The gabbro samples, dated at 126.3 ± 1.8 Ma, show geochemical similarities to typical ocean island basalt (OIB) and have positive εHf(t) values of +3.3 to +6.9. The gabbros were generated by decompression melting of deep upwelling asthenosphere. This event is best explained by slab break‐off and the resultant development of a slab window beneath central Tibet. 相似文献
2.
芮国强 《广东海洋大学学报》2003,23(2):72-78
可持续发展作为现代化建设的两大战略之一 ,对我国政府的能力提出了挑战。可持续发展战略的实施 ,要求加强政府的作用 ,将政府建设成为强有力而又廉价的政府。为此 ,我国政府应从加强政府的财政汲取能力建设、强化中央政府协调地区发展的能力 ,加强政府调控能力建设、强化中央政府协调当前利益和长远利益、经济利益与生态效益的能力 ,并从根本上转变政府职能、精兵简政、建设廉价高效的政府等方面着手来提高我国政府推进和实施可持续发展战略的能力 相似文献
3.
CHUDongsheng LIANGMeng SHIXin ZHANGLing 《中国海洋大学学报(英文版)》2004,3(1):106-110
1 Introduction Inrecentyearstherehasbeengrowingresearchin terestinthetwo dimensional (2 D )systemtheory .The 2 Dsystemsmayfindapplicationsinareassuchasmarineseismicdataprocessingandimageprocessing .Althoughmoreandmorevaluableresultshavebeengained ,mos… 相似文献
4.
5.
定性分析协方差方法及其改进型在AR(P)参数估计中的应用,提供了一种估计参数的计算机上机流程图,比较了协方差方法及其改进型谱估计结果。 相似文献
6.
The actual penetration depth of the Shoemaker-Levy 9 fragments into the Jovian atmosphere is still an open question. From fundamental equations of meteoric physics with variable cross-section, a new analytic model of energy release of the fragments is presented. In use of reasonable parameters, a series of results are calculated for different initial mass of the fragments. The results show that the largest fragment explodes above pressure levels of 3 bars and does not penetrate into the H2O cloud layer of the Jovian atmosphere, and that airburst of smaller fragments occur even above the upper cloud layer. 相似文献
7.
Magnetic stratigraphy observed in ferromanganese crust 总被引:1,自引:0,他引:1
Summary. A sample of ferromanganese crust deposit (SCHW-1D) was cut into two sets of 1 mm slices for palaeomagnetic study. Alternating field and thermal demagnetization, and isothermal remanent magnetization analyses were performed on each thin slice. The results reveal the presence of a stable magnetism and both normal and reversed polarity intervals in the specimens. The observed polarity intervals cannot be confidently correlated with the geomagnetic polarity time-scale of the last 10 Myr due to the polarity overlap inherent in the sampling technique. But the results confirm the slow accretion rate of ferromanganese deposit determined by 10 Be method and suggest potential use of ferromanganese deposits in palaeomagnetic and tectonic studies. 相似文献
8.
This paper is a continuation of previous research, which obtained a convenient solution for arbitrary surface fluxes before ponding. By means of Fourier Transformation this has been extended to derive analytical solutions of a linearized Richards' equation for arbitrary input fluxes after surface saturation. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
9.
10.
HUANGGuoqiang DONGShuanglin WANGFang 《中国海洋大学学报(英文版)》2005,4(1):56-60
Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experiment are: Fish Flesh (FF), Shrimp Flesh (SF), Clam Foot (CF), Polychaete Worm (PW), and Formulated Diet (FD). No significant differences of attractability exist between any two different diets when every two natural diets or all five diets are provided simultaneously. On the other hand, significant differences of attractability exist between FD and every single natural diet when they are provided simultaneously. Results of behavioral observation indicate that natural diets are more attractive than FD. In feeding experiment, Chinese shrimp has distinct selectivity on different diets. It positively selects CF and PW, negatively selects FF and SF, and excludes FD absolutely. The results of the present studies indicate that the dietary selectivity of shrimp was based not only on the attractabilities of the diets, but also on the responses such as growth and food conversion. 相似文献