全文获取类型
收费全文 | 1586篇 |
免费 | 41篇 |
国内免费 | 16篇 |
专业分类
测绘学 | 56篇 |
大气科学 | 70篇 |
地球物理 | 777篇 |
地质学 | 395篇 |
海洋学 | 33篇 |
天文学 | 264篇 |
综合类 | 7篇 |
自然地理 | 41篇 |
出版年
2022年 | 16篇 |
2021年 | 16篇 |
2018年 | 34篇 |
2017年 | 40篇 |
2016年 | 63篇 |
2015年 | 38篇 |
2014年 | 53篇 |
2013年 | 67篇 |
2012年 | 34篇 |
2011年 | 44篇 |
2010年 | 46篇 |
2009年 | 53篇 |
2008年 | 44篇 |
2007年 | 34篇 |
2006年 | 35篇 |
2005年 | 19篇 |
2004年 | 32篇 |
2003年 | 25篇 |
2002年 | 35篇 |
2001年 | 34篇 |
2000年 | 28篇 |
1999年 | 20篇 |
1998年 | 24篇 |
1997年 | 25篇 |
1996年 | 35篇 |
1995年 | 26篇 |
1994年 | 25篇 |
1993年 | 35篇 |
1992年 | 24篇 |
1991年 | 21篇 |
1990年 | 18篇 |
1989年 | 27篇 |
1988年 | 20篇 |
1987年 | 28篇 |
1986年 | 28篇 |
1985年 | 25篇 |
1984年 | 25篇 |
1983年 | 28篇 |
1982年 | 29篇 |
1981年 | 20篇 |
1980年 | 25篇 |
1979年 | 26篇 |
1978年 | 30篇 |
1977年 | 27篇 |
1976年 | 24篇 |
1975年 | 22篇 |
1974年 | 17篇 |
1973年 | 24篇 |
1971年 | 23篇 |
1969年 | 18篇 |
排序方式: 共有1643条查询结果,搜索用时 31 毫秒
181.
Vladimír Kropáček Miroslav Krs Reviewer V. Bucha 《Studia Geophysica et Geodaetica》1975,19(3):261-274
Summary The paper is devoted to the study of the magnetic properties, of the volume magnetic susceptibility in a weak magnetic field, of the specific magnetic susceptibility in a strong magnetic field, of natural remanent magnetization and its stability in A.C. fields, and of the temperature dependence of magnetic susceptibility of natural Mn-oxides. Samples of pyrolusite, polianite, manganite, hausmannite, psilomelan and wad from different localities all over the world were studied; the measured values are statistically treated so that the given values are valid in general. Hausmannite displayed typical values of the magnetic susceptibility, different from the values of the other Mn-oxides. In general, many natural Mn-oxides contain heterogeneous admixtures of Fe-oxides, which are responsible for their ferromagnetic properties. A high degree of magnetic hardness, predetermining the minerals for palaeomagnetic research, was proved with many of the natural Mn-oxides. 相似文献
182.
Karel Holub Vladimír Tobyáš Karel Daviš Reviewer Z. Šimon 《Studia Geophysica et Geodaetica》1975,19(4):383-388
Summary The vertical component of ground displacement was measured at the Prague - Ruzyn International Gravity Point in the frequency range of 1–300 Hz. The permanent noise, the vibrations caused by the observers during gravimetric observations and by the wind, as well as those due to normal operations at the airport, display maximum peak-to-peak amplitudes of 0.06 µm in the frequency range of 1–50 Hz; with a CG-2 gravimeter this is not detrimental to the accuracy of the observations. The taxiing of turbo-jet and jet aircraft and engine tests of aircraft generate vibrations in frequency ranges of 75–90 and 190–270 Hz. Their amplitudes, according to the results of laboratory tests published for various types of gravity meters (CG-2, GAK-PT, GVP-3, KVG), are of magnitudes which generate errors in tenths of mgl. 相似文献
183.
184.
185.
186.
Petr Vaníček 《Journal of Geodesy》1979,53(3):221-225
It is shown that for linear parametric adjustment models all the least-squares equations can be obtained from a commutative
diagram, where the observation and parameter spaces are regarded as covariant. Their contravariant counterparts are defined
through the metric property of the covariance matrix of the observations. 相似文献
187.
Summary The meteorological microseisms recorded at Prague are found to be essentially independent of the occurrence of the major midwinter stratospheric warmings. This finding contributes to studying the downward propagation mechanism of some extraterrestrial influences. 相似文献
188.
Ladislav Křivský Jan Laštovička Reviewer S. Krajčovič 《Studia Geophysica et Geodaetica》1979,23(4):393-394
a¶rt;a ma nu an u u (SID) u nu n a (a n¶rt; au) mu 1965–1975
. u u SID na¶rt;am nau, mum u nm R. 相似文献
189.
Marcela Laštovičková Josef Pek Reviewer M. Hvoždara 《Studia Geophysica et Geodaetica》1979,23(1):94-98
Summary A profile model of electric resistivity as a function of depth was compiled, the initial parameters being the values of the electric resistivity determined experimentally for basaltic and eclogitic rocks from the Bohemian Massif. The curves of the apparent resistivity were computed for this model and the measure of information evaluated for the various model layers. The dominant influence of the subsurface layer was proved. 相似文献
190.
František Blahák Jan Laštovička Revievwer L. Křivský 《Studia Geophysica et Geodaetica》1980,24(1):60-64
¶rt;m uu n ¶rt;au m uu nu mau nam aum n. mu uu auam mmmuu uuu ¶rt;u u naam. a¶rt;am auu ¶rt; uuu n ¶rt;au m u u. a auu a¶rt;am nuu amm 245 . ¶rt;aam umnmau m a¶rt;a uu. 相似文献