全文获取类型
收费全文 | 75篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
大气科学 | 1篇 |
地球物理 | 15篇 |
地质学 | 22篇 |
海洋学 | 26篇 |
天文学 | 10篇 |
自然地理 | 2篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2014年 | 2篇 |
2013年 | 2篇 |
2012年 | 5篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1984年 | 1篇 |
排序方式: 共有76条查询结果,搜索用时 15 毫秒
41.
E. A. Romankevich A. A. Vetrov N. A. Belyaev V. I. Sergienko I. P. Semiletov S. V. Sukhoverkhov S. Yu. Bratskaya N. A. Prokuda A. S. Ulyantsev 《Doklady Earth Sciences》2017,472(1):36-39
The distribution and genesis of n-alkanes in sediments from the 38-m sequence obtained during core boring in the Ivashkina lagoon were studied. Sediments were formed in the Holocene as a result of thermokarst and penetration of seawater. The sequence mostly includes permafrost rocks partially molten in the upper horizons and covered by Quaternary deposits, which are mostly the products of thermoabrasion. 相似文献
42.
We have performed calculations by abandoning the assumption of local thermodynamic equilibrium (within the so-called non-LTE approach) for Al I and Si I with model atmospheres corresponding to stars of spectral types F–G–Kwith differentmetal abundances. To take into account inelastic collisions with hydrogen atoms, for the first time we have applied the cross sections calculated by Belyaev et al. using model approaches within the formalism of the Born–Oppenheimer quantum theory. We show that for Al I non-LTE leads to higher ionization (overionization) than in LTE in the spectral line formation region and to a weakening of spectral lines, which is consistent with earlier non-LTE studies. However, our results, especially for the subordinate lines, differ quantitatively from the results of predecessors. Owing to their large cross sections, the ion-pair production and mutual neutralization processes Al I(nl) + HI(1s) ? Al II(3s 2) + H? provide a close coupling of highly excited Al I levels with the Al II ground state, which causes the deviations from the equilibrium level population to decrease compared to the calculations where the collisions only with electrons are taken into account. For three moderately metal-deficient dwarf stars, the aluminum abundance has been determined from seven Al I lines in different models of their formation. Under the assumption of LTE and in non-LTE calculations including the collisions only with electrons, the Al I 3961 ?A resonance line gives a systematically lower abundance than the mean abundance from the subordinate lines, by 0.25–0.45 dex. The difference for each star is removed by taking into account the collisions with hydrogen atoms, and the rms error of the abundance derived from all seven Al I lines decreases by a factor of 1.5–3 compared to the LTE analysis. We have calculated the non- LTE corrections to the abundance for six subordinate Al I lines as a function of the effective temperature (4500 K ≤ T eff ≤ 6500 K), surface gravity (3.0 ≤ log g ≤ 4.5), and metal abundance ([M/H] = 0, ?1, ?2, and ?3). For Si I including the collisions with HI leads to the establishment of equilibrium populations in the spectral line formation region even in hot metal-deficient models and to vanishingly small departures from LTE in spectral lines. 相似文献
43.
Eismont N. A. Nazirov R. R. Fedyaev K. S. Zubko V. A. Belyaev A. A. Zasova L. V. Gorinov D. A. Simonov A. V. 《Astronomy Letters》2021,47(5):316-330
Astronomy Letters - We consider the concept of applying gravity assist maneuvers near Venus using resonant orbits with a period equal to the Venusian one. We show that the proposed operations based... 相似文献
44.
The analysis of hydrogeological problems arising in bog watering by methods enabling the depth to groundwater table to be controlled was used to develop a method for estimating the efficiency of such control when data for directly solving groundwater flow problems are lacking. The effect of nonmonotone dependence of the rate of groundwater level rise on the hydraulic conductivity of peat underlain by high-permeability sand rocks is described. This effect is shown to be significant in assessing the potentialities of the operational control of groundwater level in bog massifs with this type of geological structure. 相似文献
45.
Geoenvironmental aspects are of importance in the development of regional models of spatial planning. The experience of Moscow can be used to determine the composition of spatial data, the cartographic resources to be incorporated, and the ways to improve the efficiency of their use, as well as to determine the logical structure of the model for developing the documents of spatial planning. 相似文献
46.
Belyaev K. P. Morozov E. G. Tuchkova N. P. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(4):365-373
Izvestiya, Atmospheric and Oceanic Physics - Estimates of the meridional mass transport of Antarctic Bottom Water, calculated using the coupled ocean-atmosphere Earth System Model on the basis of... 相似文献
47.
Ivanova E. V. Borisov D. G. Murdmaa I. O. Belyaev N. A. Zinger T. F. Nemchenko N. V. Simagin N. V. Sipko A. A. Shulga N. A. 《Oceanology》2020,60(6):869-871
Oceanology - Herein we provide information on the sedimentological and paleoceanographic research on the Argentine Patagonian continental slope during cruise 79 of the R/V Akademik Mstislav Keldysh... 相似文献
48.
Astronomy Letters - The possibility of solving the problem of a discrepancy in the non-LTE abundances from Ti I and Ti II lines in metal-poor stars is investigated by applying accurate data to take... 相似文献
49.
The process of accumulation of toxic substances by marine organisms is studied on the basis of the kinetic theory of systems
of macroscopic particles (V. I. Belyaev, 1987). The use of stochastic equations makes it possible to evaluate the degree of
accumulation of toxic substances in marine organisms and take into account random variations of their concentrations in marine
environments.
Translated by Peter V. Malyshev and Dmitry V. Malyshev. 相似文献
50.
O. M. Khlystov T. I. Zemskaya T. Ya. Sitnikova I. V. Mekhanikova I. A. Kaigorodova A. G. Gorshkov O. A. Timoshkin O. V. Shubenkova S. M. Chernitsyna A. V. Lomakina A. V. Likhoshvai A. M. Sagalevich V. I. Moskvin V. I. Peresypkin N. A. Belyaev M. V. Slipenchuk A. K. Tulokhonov M. A. Grachev 《Doklady Earth Sciences》2009,429(1):1333-1336