全文获取类型
收费全文 | 9791篇 |
免费 | 2461篇 |
国内免费 | 4065篇 |
专业分类
测绘学 | 146篇 |
大气科学 | 777篇 |
地球物理 | 1077篇 |
地质学 | 11808篇 |
海洋学 | 1007篇 |
天文学 | 22篇 |
综合类 | 705篇 |
自然地理 | 775篇 |
出版年
2024年 | 104篇 |
2023年 | 385篇 |
2022年 | 540篇 |
2021年 | 559篇 |
2020年 | 475篇 |
2019年 | 504篇 |
2018年 | 342篇 |
2017年 | 403篇 |
2016年 | 372篇 |
2015年 | 477篇 |
2014年 | 646篇 |
2013年 | 514篇 |
2012年 | 649篇 |
2011年 | 652篇 |
2010年 | 533篇 |
2009年 | 553篇 |
2008年 | 491篇 |
2007年 | 518篇 |
2006年 | 516篇 |
2005年 | 481篇 |
2004年 | 492篇 |
2003年 | 487篇 |
2002年 | 528篇 |
2001年 | 559篇 |
2000年 | 501篇 |
1999年 | 466篇 |
1998年 | 448篇 |
1997年 | 462篇 |
1996年 | 422篇 |
1995年 | 372篇 |
1994年 | 344篇 |
1993年 | 296篇 |
1992年 | 298篇 |
1991年 | 266篇 |
1990年 | 250篇 |
1989年 | 211篇 |
1988年 | 50篇 |
1987年 | 27篇 |
1986年 | 22篇 |
1985年 | 21篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 14篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1979年 | 6篇 |
1951年 | 4篇 |
1946年 | 4篇 |
1944年 | 3篇 |
1942年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
101.
102.
A new species of Araucaria, Araucaria beipiaoensis sp. nov., collected from the Middle Jurassic Tiaojishan Formation, southern hill of Shebudai village, near Beipiao city, western Liaoning is based on a permineralized female cone, which is ovate to elliptical in shape, about 11 cm × 7 cm × 4.5 cm in size. The cone bears rhomboid bracts that are spirally attached, texture thicker, with wings on both sides, with a detached lamina-like apex at the tip. In inner structure the ovuliferous scales are thicker and fused with bracts at the end with a ligular sulcns. There is one wingless ovule/seed per seed-scale complex embedded in the ovuliferous scale tissue, with the micropyle directed toward the cone axis. The ovules/seeds are long ovate or elliptical in shape, 1 cm long and near the base about 3 mm in diameter; the ovule/seed integuments have begun differentiation into 3 layers: the sarcotesta, sclerotesta, and endotesta. The nucellus is free from the enclosing integuments except in the chalazal region where it is fused to the inner layer (endotesta) of integument. Some ovules show cellularized nucellar tissue. Mature seeds exhibit the papery-thin wavy nucellus characteristically near to the micropyle. The embryonic tissue appears to be four cotyledons. The morphology and structure of the cone shows a close relationship to the araucarian cones of fossil and living genera but differs from any known species. The new species is distributed in the Middle Jurassic of the northern hemisphere, especially Asia, and has important significance for the evolution of the Family Araucariaceae. 相似文献
103.
Paleocurrent indicator data collected in field work were used to study the early Cenozoic regional paleodrainage patterns in the Hob Xil basin in northern Tibetan plateau. The paleocurrent directions of the Eocene Fenghuoshan Group obviously show that the flows were northward with a unidirectional dispersal pattern. This probably reflects the uplift of the Qiangtang terrain during the initial basin deposition period and indicates that the Tanggula Moutains occurred as topographic highlands at least in the Eocene. Paleoflows of the Oligocene Yaxicuo Group were dominantly oriented to the north and then flowed eastwards during its late deposition. This regional variability of paleodrainage patterns of the Yaxicuo Group is interpreted to record the dispersal style of sediments from transverse rivers to longitudinal river systems. It is inferred that the Oligocene uplift of the Kunlun Mountains obstructed by northward paleoflows and created longitudinal river systems parallel to the orogenic belts. The temporal and spatial changes of the paleodrainage patterns suggest that the northern boundary of the Tibetan plateau during the early Cenozoic was situated in the Hoh Xil area and its uplift has progressed northwards through time. 相似文献
104.
Late Cenozoic Stratigraphy and Paleomagnetic Chronology of the Zanda Basin, Tibet, and Records of the Uplift of the Qinghai-Tibet Plateau 总被引:1,自引:0,他引:1
MENG Xiangang ZHU Dagang SHAO Zhaogang YANG Chaobin HAN Jianen YU Ji MENG Qingwei LU Rongping 《《地质学报》英文版》2008,82(1):63-72
The characteristics of Late Cenozoic tectonic uplift of the southern margin of the Qinghai- Tibet Plateau may be inferred from fluvio-lacustrine strata in the Zanda basin, Ngari, Tibet. Magnetostratigraphic study shows that the very thick fluvio-lacustrine strata in the basin are 5.89- 0.78 Ma old and that their deposition persisted for 5.11 Ma, i.e. starting at the end of the Miocene and ending at the end of the early Pleistocene, with the Quaternary glacial stage starting in the area no later than 1.58 Ma. Analysis of the sedimentary environment indicates that the Zanda basin on the southern Qinghai-Tibet Plateau began uplift at -5.89 Ma, later than the northern Qinghai-Tibet Plateau. Presence of gravel beds in the Guge and Qangze Formations reflects that strong uplift took place at -5.15 and -2.71 Ma, with the uplift peaking at -2.71 Ma. 相似文献
105.
地震瞬时属性分析技术在岩溶勘查中的应用 总被引:3,自引:1,他引:2
介绍地震瞬时属性分析技术的原理及处理方法,分别对岩溶在地震剖面、瞬时振幅剖面、瞬时频率剖面、瞬时相位剖面上的表现特征作了说明.并结合实际资料进行多参数解释,进而确定地下岩溶的发育情况、分布范围和规模,同时对异常进行钻井验证,结果表明,地震瞬时属性分析技术比常规地震处理方法能更好地排除干扰,确定岩溶异常. 相似文献
106.
据中国科学技术期刊编辑学会国际交流工作委员会函告,经过严格评估与考察,《中国岩溶》日前已正式被美国《剑桥科学文摘》(Cambridge Scientific Abstracts,CSA)收录。 相似文献
107.
108.
109.
《中国古生物学会古植物学分会2008学术年会》于2008年8月3~6日在沈阳师范大学隆重举行。来自北京大学、吉林大学、中山大学、中国地质大学、兰州大学、西北大学、湖北大学、云南大学、安徽大学、首都师范大学、沈阳师范大学、中国科学院南京地质古生物所、中科院植物所、中科院昆明植物所、中国地质科学院水文地质所、沈阳地质调查中心、北京自然博物馆、大连自然博物馆、 相似文献
110.
松辽盆地南部油气成藏期研究——以黑帝庙地区为例 总被引:5,自引:1,他引:4
应用储层流体包裹体均一温度测试结果,结合激光拉曼光谱显微探针成分分析与构造演化史分析,认为青山口组生成的油气主要存在一期充注,包裹体均一温度是90℃~110℃,对应的油气充注时间是从82.5 Ma开始.油气存在二期成藏,即嫩江组末期和明水组末期.嫩江组烃源岩生成的油气是二期充注,流体包裹体均一温度分别是90℃~100℃和110℃~120℃,油气分别由68 Ma和66 Ma开始充注,但以后者为主.主成藏期是一期,明水组末期-古近纪时期.今后油气勘探的主要目标是寻找由嫩江组烃源岩提供油源,形成于姚家组和嫩江组中的岩性油气藏及于明水末期-古近纪时期形成的岩性-构造油气藏. 相似文献