全文获取类型
收费全文 | 86334篇 |
免费 | 759篇 |
国内免费 | 551篇 |
专业分类
测绘学 | 2219篇 |
大气科学 | 5261篇 |
地球物理 | 16396篇 |
地质学 | 33325篇 |
海洋学 | 7077篇 |
天文学 | 19490篇 |
综合类 | 313篇 |
自然地理 | 3563篇 |
出版年
2022年 | 603篇 |
2021年 | 926篇 |
2020年 | 1017篇 |
2019年 | 1079篇 |
2018年 | 4263篇 |
2017年 | 3836篇 |
2016年 | 3427篇 |
2015年 | 1216篇 |
2014年 | 2244篇 |
2013年 | 3748篇 |
2012年 | 3141篇 |
2011年 | 4867篇 |
2010年 | 4288篇 |
2009年 | 5144篇 |
2008年 | 4341篇 |
2007年 | 4860篇 |
2006年 | 3030篇 |
2005年 | 2159篇 |
2004年 | 2111篇 |
2003年 | 2070篇 |
2002年 | 1914篇 |
2001年 | 1633篇 |
2000年 | 1481篇 |
1999年 | 1148篇 |
1998年 | 1199篇 |
1997年 | 1190篇 |
1996年 | 970篇 |
1995年 | 986篇 |
1994年 | 889篇 |
1993年 | 770篇 |
1992年 | 734篇 |
1991年 | 742篇 |
1990年 | 838篇 |
1989年 | 723篇 |
1988年 | 661篇 |
1987年 | 794篇 |
1986年 | 636篇 |
1985年 | 862篇 |
1984年 | 941篇 |
1983年 | 883篇 |
1982年 | 805篇 |
1981年 | 820篇 |
1980年 | 723篇 |
1979年 | 643篇 |
1978年 | 679篇 |
1977年 | 600篇 |
1976年 | 566篇 |
1975年 | 571篇 |
1974年 | 540篇 |
1973年 | 606篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
Aleshin I. M. Ivanov S. D. Perederin F. V. Steblov G. M. Kholodkov K. I. Shirokov I. A. 《Doklady Earth Sciences》2021,496(2):160-163
Doklady Earth Sciences - A residual tilt after a teleseismic earthquake is described in this work. The results of static and dynamic modeling of this event fit the measured values. The conditions... 相似文献
952.
A Metamorphosed Au–Ag Deposit in the Precambrian of the Fennoscandian Shield: A New Conceptual Model
Doklady Earth Sciences - The Oleninskoe gold deposit is located in the northwestern part of the Kolmozero–Voron’ya greenstone belt (Kola Peninsula), in a sequence of amphibolite with... 相似文献
953.
Rytsk E. Yu. Tolmacheva E. V. Velikoslavinsky S. D. Kuznetsov A. B. Rodionov N. V. Andreev A. A. Fedoseenko A. M. 《Doklady Earth Sciences》2021,496(2):146-150
Doklady Earth Sciences - The results of U–Pb geochronological (SIMS) study of zircons from granitoids of the Konstantinovskii Stock located 6 km from the Sukhoi Log gold deposit are reported.... 相似文献
954.
Doklady Earth Sciences - The first results of studies of vertical particle fluxes in a hydrothermal sedimentary system of a subpolar area of the Mid-Atlantic Ridge under the influence of... 相似文献
955.
956.
957.
The stratigraphy of marine Plio-Pleistocene sediments from northeast Rhodes (Dodecanese islands, Greece) is revised in the light of facies mapping and the recognition of three major transgression–regression cycles. Before late Pliocene submergence, metamorphosed Mesozoic limestones formed a high-relief karstic landscape. During subsequent transgressions, subsiding basins with spectacular cliffed and bioeroded margins were infilled by a mosaic of carbonate-dominated sediments, sourced by high rates of carbonate productivity on narrow shelves rimming the basins and their drowning islands. Periods of relative sea-level fall superimposed a complex series of ‘fossil’ coastal geomorphological features such as cliffs, abrasion platforms, surf caves, notches, boulder beaches and palaeokarsts. These created the rugged present day topography of the island's northeast coast. Three main lithostratigraphic units, the Kritika, Rhodes and Lindos Acropolis Formations, are defined. The Rhodes and Lindos Acropolis Formations are subdivided into mappable facies groups rather than members, as the lithofacies are strongly diachronous. The Kritika and Rhodes Formations were each subaerially exposed and partly eroded before re-transgression. Although there is a general pattern of lithological succession, details vary across the study area and some facies groups are restricted in development, indicating differences in tectonic behaviour and palaeo-geomorphology between neighbouring basins. A preliminary process-response model is presented for the sedimentation history of the Rhodes and Lindos Acropolis Formations, using sedimentological, palaeontological, palaeoecological and ichnological data. 相似文献
958.
Chronicle
Aleksandr Georgievich Rozanov (on his 70th birthday) 相似文献959.
Solar System Research - Within the framework of Tsallis nonextensive statistics, the criteria for the Jeans gravitational instability are derived for a self-gravitating protoplanetary disk, whose... 相似文献
960.
Cheptsov V. S. Belov A. A. Vorobyova E. A. Pavlov A. K. Tsurkov D. A. Frolov D. A. Lomasov V. N. Chumikov A. E. 《Solar System Research》2021,55(5):383-388
Solar System Research - Ionizing radiation is one of the main factors that destroy biomolecules in extraterrestrial conditions. The effects of radiation depend on the conditions of the exposure... 相似文献