全文获取类型
收费全文 | 405篇 |
免费 | 0篇 |
国内免费 | 15篇 |
专业分类
测绘学 | 6篇 |
大气科学 | 30篇 |
地球物理 | 125篇 |
地质学 | 161篇 |
海洋学 | 31篇 |
天文学 | 55篇 |
综合类 | 2篇 |
自然地理 | 10篇 |
出版年
2021年 | 4篇 |
2018年 | 22篇 |
2017年 | 14篇 |
2016年 | 9篇 |
2015年 | 10篇 |
2014年 | 15篇 |
2013年 | 12篇 |
2012年 | 21篇 |
2011年 | 15篇 |
2010年 | 9篇 |
2009年 | 9篇 |
2008年 | 15篇 |
2007年 | 8篇 |
2006年 | 14篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 12篇 |
2001年 | 9篇 |
1999年 | 4篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1994年 | 5篇 |
1991年 | 4篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1983年 | 4篇 |
1981年 | 13篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1977年 | 11篇 |
1975年 | 8篇 |
1974年 | 7篇 |
1973年 | 8篇 |
1972年 | 5篇 |
1970年 | 5篇 |
1969年 | 5篇 |
1967年 | 3篇 |
1964年 | 3篇 |
1962年 | 4篇 |
1956年 | 3篇 |
1954年 | 5篇 |
1951年 | 5篇 |
1948年 | 4篇 |
1940年 | 3篇 |
1939年 | 3篇 |
1935年 | 4篇 |
1913年 | 3篇 |
排序方式: 共有420条查询结果,搜索用时 15 毫秒
81.
Ohne Zusammenfassung 相似文献
82.
Siberian river run-off and Late Quaternary glaciation in the southern Kara Sea, Arctic Ocean: preliminary results 总被引:3,自引:0,他引:3
Ruediger Stein Frank Niessen Klaus Dittmers Michael Levitan Frank Schoster Johannes Simstich Tatjana Steinke Oleg V. Stepanets 《Polar research》2002,21(2):315-322
The extent of the Barents-Kara Ice Sheet during the eastern Last Glacial Maximum (LGM) is not yet fully known. A detailed echo-sounding survey performed during the Boris Petrov Expedition 2001 permitted the detailed mapping of part of it. Based on the profiling results, a southern connection between the LGM Barents-Kara Ice Sheet and a local ice sheet on Taymyr Peninsula appears to be unlikely. Based on sediment core data and profiling results, most of the terrigenous river-derived material accumulated in the estuaries during late Holocene times, whereas during early Holocene times of lowered sea level major amounts were transported further offshore and accumulated on the shelf. During the post-glacial sea level rise, the main depocentre migrated southward, reaching its present position no earlier than about 6 cal. Ky BP (or 5.2 Kya). Future studies of accelerator mass spectrometry (AMS) 14 C-dated sediment cores will allow a detailed reconstruction of the variability of fluvial sediment discharge and the history of glaciation in the Kara Sea during late Quaternary times. 相似文献
83.
T. Berkefeld W. Schmidt D. Soltau A. Bell H. P. Doerr B. Feger R. Friedlein K. Gerber F. Heidecke T. Kentischer O. v.?d. L??he M. Sigwarth E. W?lde P. Barthol W. Deutsch A. Gandorfer D. Germerott B. Grauf R. Meller A. ??lvarez-Herrero M. Kn?lker V. Mart??nez Pillet S. K. Solanki A. M. Title 《Solar physics》2011,268(1):103-123
This paper describes the wave-front correction system developed for the Sunrise balloon telescope, and it provides information about its in-flight performance. For the correction of low-order aberrations, a Correlating Wave-Front Sensor (CWS) was used. It consisted of a six-element Shack??C?Hartmann wave-front sensor (WFS), a fast tip-tilt mirror for the compensation of image motion, and an active telescope secondary mirror for focus correction. The CWS delivered a stabilized image with a precision of 0.04?arcsec (rms), whenever the coarse pointing was better than ???45?arcsec peak-to-peak. The automatic focus adjustment maintained a focus stability of 0.01?waves in the focal plane of the CWS. During the 5.5?day flight, good image quality and stability were achieved during 33?hours, containing 45?sequences, which lasted between 10 and 45?min. 相似文献
84.
We present the UV spectroscopy and timing of three nearby pulsars (Vela, B0656+14 and Geminga) recently observed with the
Space Telescope Imaging Spectrograph. We also review the optical and X-ray properties of these pulsars and establish their
connection with the UV properties. We show that the multiwavelengths properties of neutron stars (NSs) vary significantly
within the sample of middle-aged pulsars. Even larger differences are found between the thermal components of Geminga and
B0656+14 as compared to those of radio-quiet isolated NSs. These differences could be attributed to different properties of
the NS surface layers.
This work was supported by STScI grants GO-9182 and GO-9797 and NASA grant NAG5-10865. 相似文献
85.
Victor G. Kornilov Vladimir M. Lipunov Evgeny S. Gorbovskoy Aleksander A. Belinski Dmitry A. Kuvshinov Natalia V. Tyurina Nikolai I. Shatsky Anatoly V. Sankovich Aleksander V. Krylov Pavel V. Balanutsa Vadim V. Chazov Artem S. Kuznetsov Dmitry S. Zimnuhov Victor A. Senik Andrey G. Tlatov Aleksander V. Parkhomenko Denis V. Dormidontov Vadim V. Krushinsky Ivan S. Zalozhnyh Aleksander A. Popov Sergey A. Yazev Nikolai M. Budnev Kirill I. Ivanov Evgeny N. Konstantinov Oleg A. Gress Oleg V. Chvalaev Vladimir V. Yurkov Yury P. Sergienko Irina P. Kudelina 《Experimental Astronomy》2012,33(1):173-196
Presented paper describes the basic principles and features of the implementation of a robotic network of optical telescopes MASTER, designed to study the prompt (simultaneous with gamma radiation) optical emission of gamma-ray bursts and to perform the sky survey to detect unknown objects and transient phenomena. With joint efforts of Sternberg astronomical institute, High altitude astronomical station of the Pulkovo observatory, Ural state university, Irkutsk state university, Blagoveshchensk pedagogical university, the robotic telescopes MASTER?II near Kislovodsk, Yekaterinburg, Irkutsk and Blagoveshchensk were installed and tested. The network spread over the longitudes is greater than 6?h. A further expansion of the network is considered. 相似文献
86.
87.
E. Hoepffner E. Kayser G. Linck G. Steinmann W. v. Seidlitz 《International Journal of Earth Sciences》1913,4(8):595-595
Ohne Zusammenfassung 相似文献
88.
Oleg Zaytsev Rafael Cervantes-Duarte Orzo Montante Artemio Gallegos-Garcia 《Journal of Oceanography》2003,59(4):489-502
High primary productivity on the Pacific coast of the Baja California Peninsula is usually related to coastal upwelling activity
that injects nutrients into the euphotic zone in response to prevailing longshore winds (from the northwest to north). The
upwelling process has maximum intensity from April to June, with the coastal upwelling index varying from 50 to 300 m3/s per 100 m of coastline. Along the entire coast of the peninsula, the upwelling intensity changes in accordance with local
wind conditions and bottom topography. Spatial variability can also be modulated by the influence of mesoscale meanders of
the California Current. We have identified the seasonal and synoptic variability of upwelling signatures on the Baja California
shelf, using averaged monthly and weekly sea surface temperature (SST) distributions obtained from remote sensing imagery
from the Advanced Very High Resolution Radiometer in the period from 1996 to 2001. Analysis of SST distribution and direct
experimental data on temperature and nutrient concentration shows that the areas with the coldest SST anomalies were closely
related to the bottom slope, shelf width, and coastline orientation relating to wind direction. We also assume that the nutrient
transport into the coastal lagoons may be forced by the coupling of coastal upwelling and tidal pumping of surface waters
into the lagoon system.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
89.
在奥地利Hohe Tauern的Schlatenkees冰川上布置了两组地震仪测量网,用电动力垂直地震仪记录到了约1200次冰震。找出了地震学参数彼此之间的几种关系。并根据优势频率,将冰震分成了4组。记录到的震动事件的震深为25—130m,震源半径为12—67m,地震矩为4.23×10~5—6.52×10~7Nm,地震能为9.1—1.34x10~5J,应力降为0.16—32.04hPa。 相似文献
90.
Contributions to Mineralogy and Petrology - Es wird theoretisch abgeleitet, daß für alle porösen Stoffe der folgende Zusammenhang zwischen Permeabilität und Porosität... 相似文献