全文获取类型
收费全文 | 74篇 |
免费 | 1篇 |
专业分类
地球物理 | 9篇 |
地质学 | 34篇 |
海洋学 | 9篇 |
天文学 | 23篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 9篇 |
2016年 | 5篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 1篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1988年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有75条查询结果,搜索用时 156 毫秒
11.
From a gravitational field analysis, the lithosphere was regionalized and a structural schematic map of the eastern part of the Indian Ocean was compiled. The area adjacent to the western margin of Australia was studied. The region is characterized by a complex lithospheric structure. It includes heterogeneous blocks of varying age, framed by structures with different morphological and geophysical expression and varying genesis. To clarify the peculiarities of tectonic structures of various genetic types, structural-density modeling was performed. This made it possible to establish certain gravimetric indicators characteristic of structures of various genesis. 相似文献
12.
Yu. I. Galushkin E. P. Dubinin A. A. Sveshnikov 《Izvestiya Physics of the Solid Earth》2007,43(2):130-147
A nonstationary model of spreading with periodic intrusions of a molten material into an axial zone of a mid-ocean ridge (MOR) is applied to numerical analysis of the thermal state in MOR axial zones and the formation of crustal and mantle magma chambers in them. The model satisfactorily explains the positions, dimensions, and shapes of magma chambers, as well as variations in these parameters depending on the spreading rate, temperature, and composition of crustal and mantle rocks. The release and absorption of the latent heat of rock melting, hydrothermal heating of the crust, and variations in the solidus and liquidus temperatures of crustal and mantle rocks as a function of their composition are factors controlling the shape and position of crustal magma chambers. 相似文献
13.
The paper describes algorithms of data processing using methods of wavelet analysis. The main integral transforms of 2-D data based on ideas of multiscale analysis and the Radon transform are examined. The latter belongs to the class of beamlet transforms. They are briefly characterized and their application is illustrated by simple geophysical examples. 相似文献
14.
The estimates of the magnetic field in the Halley's comet tail based on the observed acceleration of the matter and the pressure balance are discussed. 相似文献
15.
E. Dubinin D. Winningham J. Woch S. Barabash R. Frahm A.J. Coates J.-A. Sauvaud H. Andersson A. Grigoriev K. Asamura K.S. Hsieh H. Koskinen P. Riihelä T. Säles J. Luhmann R. Cerulli-Irelli M. Maggi D. Williams P. Wurz C. Dierker M. Carter 《Icarus》2006,182(2):343-349
The ASPERA-3 experiment onboard the Mars Express spacecraft revealed, near the wake boundary of Mars, a spatially narrow, strip-like plasma structure composed of magnetosheath-like electrons and planetary ions. The peak electron energy often exceeds the peak energy at the bow shock that indicates a significant heating (acceleration) during the structure formation. It is shown that this structure is formed during efficient plasma penetration into the martian magnetosphere in the region near the terminator. The penetration of sheath electrons and their gradual heating (acceleration) is accompanied by a change of the ion composition from a solar wind plasma to a planetary plasma dominated by oxygen ions. A possible mechanism of plasma inflow to the magnetosphere is discussed. 相似文献
16.
I. M. Podgorny E. M. Dubinin P. L. Israelevich C. P. Sonett 《Earth, Moon, and Planets》1982,27(4):397-406
Analysis of Venera 9 and 10 data suggest a comingled excitation of the ionosphere of Venus by the time dependent component of the interplanetary magnetic field, upon which may be super-imposed a contribution from the interplanetary electric field. The inductive contributions correspond respectively to generation of eddy currents and to unipolar induction, i.e., the TE and TM modes of classical electromagnetism. The former is suggested when the interplanetary magnetic field exhibits significant changes in intensity or orientation, but could also have contributions from fluctuations in plasma pressure expressed through the frozen-in field. Since the TM mode depends upon E=v
c
×B, the TM mode can also have an unsteady component. The magnetic field measured near Venus by Venera 9 and 10 is considered within this framework and with respect to laboratory simulation using both conducting and insulated (but internally conducting) spheres. 相似文献
17.
18.
19.
Oceanology - The features of structure formation on the adjacent margins of Iberia and Newfoundland are considered based on an analysis of geological and geophysical data and physical modeling.... 相似文献
20.
E. V. Yakushev E. L. Vinogradova A. V. Dubinin A. V. Kostyleva N. M. Men’shikova S. V. Pakhomova 《Oceanology》2012,52(1):122-129
The accuracy and detection limit of the oxygen technique is an actual problem in studying the processes that occur in the
redox zone. The formal accuracy of the Winkler technique is 1 μM (0.02 mL L−1) and its detection limit is about 3.0 μM (0.06 mL L−1). These values are significantly higher than the similar characteristics (in molar concentrations) for such parameters as
the hydrogen sulphide, nitrates, manganese, and others. In this work, we describe some recommendations for increasing the
accuracy of the Winkler technique. The results of the application of these recommendations for the suboxic zone of the Black
Sea are presented. During the 100th cruise of the R/V Professor Shtokman, argon-filled balloons were attached to the upper valves of Niskin bottles during the sampling, which allowed protecting
the samples from contamination with atmospheric oxygen. The titration was performed with an automatic Metrohm Titrino burette
with potentiometric end point detection. That allowed us to significantly increase the accuracy and decrease the detection
limit compared with the visual techniques. The oxidized forms of metals present in the sea water (Mn(IV), Mn(III); Fe(III))
were measured, which allowed us to correct the Winkler technique calculations for the oxidizers. The studies performed during
the 100th cruise of the R/V Professor Shtokman confirmed the absence of a layer of the coexistence of oxygen and hydrogen sulphide. 相似文献