全文获取类型
收费全文 | 51篇 |
免费 | 0篇 |
专业分类
测绘学 | 1篇 |
大气科学 | 5篇 |
地球物理 | 4篇 |
地质学 | 9篇 |
海洋学 | 5篇 |
天文学 | 26篇 |
自然地理 | 1篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 1篇 |
2011年 | 5篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 5篇 |
2007年 | 1篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 2篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1976年 | 3篇 |
排序方式: 共有51条查询结果,搜索用时 78 毫秒
11.
12.
Using the model of single-domain particles, a theoretical analysis of the properties of different forms of piezoremanent magnetization is carried out. The relationships which determine piezoremanent magnetization within the entire range of stresses are obtained. Two mechanisms of magnetization are revealed. It is shown that in the weak field approximation the magnetization of the first type has a quadratic dependence on the magnetic field and weakly depends on stresses, while another type of magnetization, which mainly determines the piezomagnetic effect, is proportional to the field and stresses. Moreover the magnetization that forms in the course of a change in stresses parallel to the field is always higher than the magnetization that appears as a result of action perpendicular to the field. 相似文献
13.
First measurements of the short time variations of Ap stars with the twin telescope show a nonlinear drift caused by a sensibility of the amplifier depending on temperature. Moreover we found a dependence of the impulse rate on the position of the star image in the diaphragm. Special test measurements with a simple incandescent lamp show that this telescope gives results with an accuracy of ± 0.002 mag after elimination of these effects. 相似文献
14.
In the 20th century on the territory of the northern slope of the Greater Caucasus the number of glaciers increased by 245 (or by 19%) and the glaciation area decreased by 849 km2 (or by 52.6%). It is revealed that the increase in the number of glaciers occurred as a result of the disintegration of larger glaciers into smaller parts and as a result of the cutoff of their tributaries, and the decrease in the glaciation area, due to the negative balance of the mass of glaciers. The length of all glaciers decreased by 128–3520 m during that period. It is demonstrated that in 1970–2011 the decrease in the glaciation area occurred with the rate being smaller than in 1895–1970 by 1.6 times that is associated with more favorable climatic conditions in 1970–2011. According to the computations of the climate model by the Main Geophysical Observatory (moderate scenario) for 2011–2099, average annual air temperature will increase by 1.06–2.70°C and the annual amount of precipitation, by 2.09–2.77%. According to the results of computations, the glaciation area in 2011–2099 will reduce by 585 km2 or by 76.5%. In the region under consideration, glaciation with the area of 180 km2 which will be concentrated only in the central part of the Greater Caucasus will maintain by 2099. The glacier runoff will decrease by 74–80%. 相似文献
15.
16.
M. I. Bujakaite Yu. O. Gavrilov D. O. Gertsev D. I. Golovin D. I. Panov Yu. V. Kushcheva 《Lithology and Mineral Resources》2003,38(6):522-529
The behavior of K–Ar and Rb–Sr isotopic systems in clayey rocks from the Jurassic terrigenouis complex of the Greater Caucasus sampled along the Terek River is discussed. It is shown that the rocks experienced intense postdiagenetic alterations accompanied by substantial changes in mineral composition and K–Ar and Rb–Sr isotopic systems. Lateral stress is the leading factor responsible for secondary mineral and geochemical transformations of rocks in cleavage zones. Rejuvenation of the radiological age of rocks, relative to their stratigraphic age, is 100 Ma and more. The age estimate of approximately 50 Ma obtained for samples from the southern limb of the anticlinorium reflects the Paleocene–Eocene phase of tectonic activity manifested in both the Caucasus and other areas of the Mediterranean foldbelt. 相似文献
17.
Firsova Alena D. Chebykin Eugene P. Kopyrina Liubov I. Rodionova Elena V. Chensky Dmitry A. Gubin Nikita A. Panov Vsevolod S. Pogodaeva Tatyana V. Bukin Yurij S. Suturin Alexandr N. Likhoshway Yelena V. 《Journal of Paleolimnology》2021,66(4):407-437
Journal of Paleolimnology - In this study, radiocarbon-dated geochemical and diatom records from Lake Vorota located within the informal meteorological ‘pole of cold’ of the northern... 相似文献
18.
Deposits of the Lower Tauric suite (Upper Triassic) are exposed in the Kacha Anicline Uplift (Southeastern Crimea) near the
source of the Bodrak River. Their rhythmostratigraphic, lithological, and paleontological charactristics are given for the
first time; their tectonic position is determined and their age is specified. The principles for stratigraphic subdivision
of the Tauric series are formulated. 相似文献
19.
V. F. Gopka A. V. Yushchenko V. A. Yushchenko I. V. Panov Ch. Kim 《Kinematics and Physics of Celestial Bodies》2008,24(2):89-98
Absorption lines of some actinides, namely, actinium (Z = 89), protactinium (91), neptunium (93), plutonium (94), americium (95), curium (96), berkelium (97), californium (98), and einsteinium (99), were identified in the spectrum of one of the most peculiar main-sequence stars HD 101065 (Przybylski’s star). In the identification we used a high-resolution spectrum (R = 80 000) acquired at the 8.2-m ESO telescope. 相似文献
20.
New spectroscopic and photometric observations of the variable Ap star ET And carried out 1982 and 1983 confirm once again the existence of short-time variations. For the radial velocity variations a period of 0.19771 days and for the light variations a period of 0.0989 days was found. Some spectrograms show a velocity progression of the Balmer lines. The gradient is of such a kind that the radial velocity values increase from the line Hγ to H15. Different models for the interpreation of the velocity progression are discussed. 相似文献