全文获取类型
收费全文 | 825篇 |
免费 | 139篇 |
国内免费 | 177篇 |
专业分类
测绘学 | 180篇 |
大气科学 | 202篇 |
地球物理 | 137篇 |
地质学 | 293篇 |
海洋学 | 42篇 |
天文学 | 5篇 |
综合类 | 101篇 |
自然地理 | 181篇 |
出版年
2024年 | 5篇 |
2023年 | 25篇 |
2022年 | 73篇 |
2021年 | 109篇 |
2020年 | 118篇 |
2019年 | 75篇 |
2018年 | 55篇 |
2017年 | 86篇 |
2016年 | 72篇 |
2015年 | 62篇 |
2014年 | 48篇 |
2013年 | 39篇 |
2012年 | 25篇 |
2011年 | 39篇 |
2010年 | 29篇 |
2009年 | 29篇 |
2008年 | 24篇 |
2007年 | 25篇 |
2006年 | 19篇 |
2005年 | 33篇 |
2004年 | 21篇 |
2003年 | 13篇 |
2002年 | 16篇 |
2001年 | 17篇 |
2000年 | 12篇 |
1999年 | 9篇 |
1998年 | 5篇 |
1997年 | 7篇 |
1996年 | 10篇 |
1995年 | 8篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 7篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有1141条查询结果,搜索用时 45 毫秒
1.
Granular carbonate deposits of Late Pleistocene to Early Holocene age, commonly referred to as ‘miliolite limestone’, occur in a linear belt, parallel to the southern coast of Saurashtra, India. In the present study area these carbonate deposits are found in select valleys between ridges and mounds of pyroclastic material present in the Deccan trap plateau. Two different depositional histories have been proposed for these sediments. The presence of marine bioclasts led to the postulation of a marine origin for these deposits. The second school of thought propounded redeposition of the coastal sediments by aeolian processes. Although a few features could not be explained by the proposed aeolian model, critical comparison of these two views favoured the aeolian origin. The mode of occurrence, lithological and structural attributes, and microscopic evidence presented here, also support a possible aeolian origin for these deposits. Experimental observation indicates that these carbonate aeolianites represent backflow deposits, which accumulated because of the flow separation caused by the presence of topographic highs. The conspicuous concave‐up geometry of the deposit conformed to the shape of the separation bulb. In view of the inferred depositional mechanism, the disposition of the deposits and the signature of the palaeoflow direction suggest that the carbonate particles were derived from the north‐western coast of Saurashtra by strong south‐easterly winds. Massive granular carbonates with outsized basement clasts appear to be the product of avalanching of granular material from the higher contours because of oversteepening of the primary deposit. 相似文献
2.
3.
Abstract. The frequency of parasitism of free ending prop roots of the red mangrove, Rhizophora mangle, by the wood boring isopod Sphaeroma terebrans, increased with increasing distance of the endings to established roots. In a field experiment, in which isolated endings were, surrounded by wooden sticks, the endings were colonized by S. terebrans at a lower rate than control endings, thus indicating that the wooden structures in the vicinity of the ending tended to reduce colonization rate by S. terebrans. It is concluded that S. terebrans may cause mangrove root density to increase by colonizing peripheral endings more readily than endings which are near established roots. 相似文献
4.
硅化木,又称树化石、木化石,无论它的内在品质多么优良,依然是“化石”身份,不能把优质硅化木称为“树化玉”。因为按照所谓“化”的含义,“树化玉”就只能解释为“玉”变成了“树”,或解释为“玉”具有了“树”的一些性质和特征,这显然是不对的。再如,古生物化石也不能称为“古生物化玉”。所以将硅化木称“树化玉”是欠妥的。 相似文献
5.
In Sung Paik Min Huh Kye Hun Park Koo Geun Hwang Kyung Sik Kim Hyun Joo Kim 《Journal of Asian Earth Sciences》2006,28(4-6):457-468
Eighty two dinosaur trackways were newly discovered in Upper Cretaceous lacustrine deposits on islands in the vicinity of Yeosu, Korea. Most dinosaur tracks occur in marginal lake deposits with polygonal desiccation cracks. The dinosaur tracks at the Yeosu site include 65 ornithopod trackways, 16 theropod trackways and one sauropod trackway. The prevalence of ornithopod tracks and the limited occurrence of sauropod tracks at the Yeosu site evidently reflect decreased sauropod diversity in the Upper Cretaceous. All ornithopod trackways represent bipeds, and most of the ornithopod tracks are similar to Caririchnium from other sites of the Korean peninsula. All fossil wood specimens collected in the study area represent conifers (three species of cupressaceous and two species of taxodiaceous conifers, and a new species) except for one, which is a discotyledon. It is thus inferred that the southwestern part of the Korean Peninsula was primarily covered with mesic forests with taxodiaceous trees during the Late Cretaceous. The K–Ar age of the Yeosu tracksite is determined as 81–65 Ma (Camapnian to Maastrichtian). It indicates that the Yeosu track site contains the last records of dinosaurs living in Asia. Consequently, semi-arid palaeoclimatic conditions, together with a large lake as a persistent water source and rich vegetation of gymnosperm trees as food, resulted in the preservation of abundant dinosaur tracks in the Upper Cretaceous on the Korean Peninsula. 相似文献
6.
7.
8.
北太平洋阻塞的年际年代际变化及其与SST、遥相关及风暴路径的关系 总被引:2,自引:0,他引:2
利用NCEP/NCAR再分析资料,对1948/1949-1999/2000共52个冬季的北太平洋上空中纬度阻塞异常的气修特征进行了统计分析,小波分析和功率谱分析结果表明该区域阻塞发生的频数具有很明显的3-7年的年际振荡和年代际变化特征。同时2-7年带通平均的小波方差谱分析结果表明阻塞的这种年际变化的振幅存在着缓慢下降的趋势,且气候突变在20世纪70年代,这进一步证明了北太平洋上空的阻塞活动具有年代际变化特征。对强阻塞异常的冬季和弱阻塞异常的冬季分别进行合成分析,结果表明,对于阻塞异常强的冬季,北太平洋西向东北方向加强并分裂成两个中心,而SST异常在中纬度太平洋则对应着典型的PDO型,在赤道地区则为类La Nina型的海温分布。而对于阻塞异常弱的冬季则对应截然不同甚至相反的分布特征,即500hPa高度异常场表现为符号相反的PNA型,风暴路径中心在日界线附近呈纬向型分布。同时SST异常在赤道地区则为典型的El Nino型的海温分布。以上结果揭示出北太平洋阻塞活动的年际变化可能主要与热带海温的遥响应相联系,而年代际变化则主要与中纬度局地的PDO型海温及其通过斜压瞬变波的海-气相互作用有关。 相似文献
9.
分析了1900年以来长江3次巨洪的3个强信号:(1)太阳黑子活动,(2)厄尔尼诺事件,(3)青藏高原南部大震,它们对大气环流异常的影响分别称为日气作用、海气作用、地气作用,依据长江巨洪和3个强信号的基本事实,讨论了长江发生巨洪的统计规律,指出当3个强信号的出现时间互相重叠时,长江很可能发生巨洪,如果再叠加其它信号,长江发生巨洪的量级更大,这对长江巨洪的超长期预期具有重要的指示作用。 相似文献
10.
1996年北半球主要环流特征是:500hPa西太平洋副高偏弱,脊线位置初夏偏北,盛夏西端持续偏南;亚洲西风带后冬至初春经向环流明显发展,7月亚洲中纬度地区常有阻塞形势维持,500hPa青藏高原位势高度偏高,夏季南支印缅槽较弱。 相似文献