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31.
The transformation of the interfaces of a rotating three-layer fluid is described through a simple hydrodynamic model using the shallow-water approximation. Using the Greenland sea gyre as an example, it is shown that a cyclonic circulation results in the oncoming deflection of the upper and lower layers, which favours the development of deep convection.Translated by Mikhail M. Trufanov. 相似文献
32.
33.
G. P. Marchenko L. A. Akimov I. L. Belkina Yu. I. Velikodsky 《Kinematics and Physics of Celestial Bodies》2011,27(4):183-190
We present the processing results of slitless chromospheric spectra in a D3 helium line obtained during the solar eclipse of March 29, 2006. A “Cascade-Photometrics 650” CCD matrix photodetector with
a rate of 16 frames/s was used for the observations. Altitude distribution of absolute brightness of the helium chromosphere
has been mapped in a latitude interval 30 N-10 S on the western limb. A correlation between absolute brightness of the helium
chromosphere and a solar cycle phase has been confirmed. It has been revealed that the altitude distribution of helium emission
has one maximum at an altitude of approximately 2000 km. In the lower chromosphere, helium emission is undetectable. This
confirms our assumption about absence of an additional maximum at 300 km in the D3 line brightness distribution in the chromosphere during sunspot maximum periods. The results also prove that X-ray coronal
radiation with λ < 6 nm is the source of helium excitation in the lower chromosphere. 相似文献
34.
The formation of fast ice in the costal zone of freezing seas (immobile ice) is considered on the basis of a specially developed
thermodynamic model that takes into account the energy exchange in the atmospheric boundary layer and the salinification of
the water layer under the ice. The conditions at which the wind forced onshore motion of the ice under the influence of the
wind stress at the ice’s surface is possible are studied using the example of the Baidaratskaya Guba in the Kara Sea. 相似文献
35.
Leningrad State University. Translated from Astrofizika, Vol. 30, No. 1, pp. 7–14, January–February, 1989. 相似文献
36.
Evolution of the Earth's principal axes and moments of inertia: the canonical form of solution 总被引:4,自引:0,他引:4
Harmonic coefficients of the 2nd degree are separated into the invariant quantitative (the 2nd-degree variance) and the qualitative
(the standardized harmonic coefficients) characteristics of the behavior of the potential V
2(t). On this basis the evolution of the Earth's dynamical figure is described as a solution of the time-dependent eigenvalues–eigenvectors
problem in the canonical form. Such a canonical quadratic form is defined only by temporal variations of the harmonic coefficients
and always remains finite, even within an infinite time interval. An additional condition for the correction or the determination
of temporal variations of the 2nd degree is obtained. Temporal variations of the fully normalized sectorial harmonic coefficients
are estimated in addition to ˙Cˉ
20, ˙Cˉ
21, and ˙Sˉ
21 of the EGM96 gravity model. In addition, a non-linear hyperbolic model for Cˉ
2m
(t), Sˉ
2m
(t) is constructed. The trigonometric form of the hyperbolic model leads to the consideration of the potential V
2(ψ) instead of V
2(t) within the closed interval −π/2≤ψ≤+π/2. Thus, it is possible to evaluate the global trend of V
2(t), the Earth's principal axes and the differences of the moments of inertia within the whole infinite time interval.
Received: 25 September 1998 / Accepted: 28 June 2000 相似文献
37.
The impact of tidal wave on a permeable shore consisting of porous material results in groundwater table lying above the average sea level. This effect, stemming from the nonlinearity of the process of seawater flow in the soil, is referred to as pumping effect. 相似文献
38.
T. V. Berezhnykh O. Yu. Marchenko N. V. Abasov V. I. Mordvinov 《Geography and Natural Resources》2012,33(3):223-229
We examine the formation patterns of the low-water periods 1976?C1982 and 1996?C2011 for the Selenga river. One of the immediate reasons for the low-water periods under consideration is the attenuation of the circulation in the zone of convergence of monsoon flows and mid-latitude flows over Mongolia and North China. Unlike the low-water periods of the preceding decades, a decrease in precipitation amounts during the current low-water period is taking place concurrently with large-scale climatic changes. 相似文献
39.
Doklady Earth Sciences - Based on the data of atomic modeling, the different schemes of isomorphic incorporation of Cr3+ ions into the crystal structures of CaSiO3 and MgSiO3 were tested in the... 相似文献
40.
Kazuyuki Saito Sergei Marchenko Vladimir Romanovsky Amy Hendricks Nancy Bigelow Kenji Yoshikawa John Walsh 《Boreas: An International Journal of Quaternary Research》2014,43(3):733-749
A high‐resolution map of potential frozen ground distribution in NE Asia (90–150°E, 25–60°N) at the period of the Last Permafrost Maximum (LPM, c. 21 000 years ago) was dually reconstructed by means of a statistical classification using air freezing and thawing indices and a topographical downscaling using a digital relief model (ETOPO1). Background LPM climate data were derived from global climate model simulations of the Paleoclimate Model Intercomparison Project, Phase II (PMIP2). The reconstructed LPM map shows the southward shift of the southern limit of climate‐driven permafrost by 400–1500 km, with the greatest advance in the western sector (90–110°E), encompassing an area from central Siberia to most of the Altai area. The advance of environmentally conditional permafrost and seasonally frozen ground was greatest in the eastern sector (110–150°E), with an average shift of about 450 km. The descent of the lower limit of LPM alpine permafrost was in the range of 400–800 m. A comparison of the reconstructed map with published literature shows that this method, simplistically constructed yet effectively recognizing seasonality, continentality and topography, captures local features better than more elaborate methods. The sensitivity examination of a constant atmospheric lapse rate shows that altitudes of 2000–5000 m a.s.l. were most sensitive, though with only a limited effect on overall LPM distribution. 相似文献