全文获取类型
收费全文 | 22948篇 |
免费 | 189篇 |
国内免费 | 130篇 |
专业分类
测绘学 | 354篇 |
大气科学 | 1203篇 |
地球物理 | 4354篇 |
地质学 | 8987篇 |
海洋学 | 2230篇 |
天文学 | 5272篇 |
综合类 | 42篇 |
自然地理 | 825篇 |
出版年
2022年 | 263篇 |
2021年 | 431篇 |
2020年 | 394篇 |
2019年 | 461篇 |
2018年 | 939篇 |
2017年 | 864篇 |
2016年 | 879篇 |
2015年 | 365篇 |
2014年 | 765篇 |
2013年 | 1287篇 |
2012年 | 897篇 |
2011年 | 1091篇 |
2010年 | 1054篇 |
2009年 | 1214篇 |
2008年 | 1039篇 |
2007年 | 1217篇 |
2006年 | 1060篇 |
2005年 | 565篇 |
2004年 | 534篇 |
2003年 | 539篇 |
2002年 | 559篇 |
2001年 | 508篇 |
2000年 | 409篇 |
1999年 | 333篇 |
1998年 | 322篇 |
1997年 | 328篇 |
1996年 | 254篇 |
1995年 | 261篇 |
1994年 | 236篇 |
1993年 | 182篇 |
1992年 | 208篇 |
1991年 | 181篇 |
1990年 | 195篇 |
1989年 | 187篇 |
1988年 | 156篇 |
1987年 | 182篇 |
1986年 | 170篇 |
1985年 | 205篇 |
1984年 | 198篇 |
1983年 | 197篇 |
1982年 | 188篇 |
1981年 | 172篇 |
1980年 | 162篇 |
1979年 | 182篇 |
1978年 | 158篇 |
1977年 | 142篇 |
1976年 | 133篇 |
1975年 | 136篇 |
1974年 | 125篇 |
1973年 | 165篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
I. M. Vasilyev Yu. P. Kozhevnikov S. A. Matsiyevskiy V. G. Mezhberg A. V. Rykov I. V. Ulomov 《Seismic Instruments》2009,45(1):60-68
This paper considers the possibilities for modernizing the KSESh broadband seismic station developed earlier at the IPE AS USSR. The goal of the modernization was to extend the frequency and dynamic ranges and to decrease nonlinear distortions. The ways and concrete methods for improving the mechanical construction and electronic components of the station are shown and the intermediate results are described. As preliminary estimates show, there is an opportunity to build devices with the velocimeter response up to 520–540 s periods on the basis of this pendulum. 相似文献
912.
I. R. Stakhovsky 《Izvestiya Physics of the Solid Earth》2008,44(7):570-576
A phenomenological scheme is proposed for the formation of a seismic macrofracture in the crust through multiscale avalanche-like
crack coalescence of the inverse cascade type. Relations connecting fractal dimensions of crack sets and the concentration
criterion of coalescence of cracks that are required for the onset of multiscale fracture are obtained. It is shown that the
enlargement of cracks from micro-to macroscales includes a relatively small number of hierarchical coalescence stages. 相似文献
913.
We present a mathematical model of local, steady groundwater flow near a vertical barrier wall. Flow features represented in the model include an impermeable arc-shaped barrier wall and multiple wells; distant boundary conditions are not included explicitly, but their effects on the local flow field are modelled by specifying a uniform flow at infinity and a constant areal recharge within a local domain. We develop an explicit closed-form solution to the boundary-value problem using the analytic element method. The solution is an extension of a harmonic solution presented by Anderson and Mesa [Anderson EI, Mesa E. The effects of vertical barrier walls on the hydraulic control of contaminated groundwater. Adv Water Resourc 2006;29(1):89–98] which does not include the effects of recharge. We demonstrate that the general solution with recharge consists of the harmonic solution superposed on a special case of the harmonic solution along with two elementary one-dimensional flow solutions. The results are used to investigate the effects of areal recharge on the capture zone envelopes of the pumping wells and on the reduction in discharge that can be achieved by including a barrier wall in a pump and treat design. We find that the benefits of including an open barrier wall in a design, measured as a reduction in the pumping rate required to contain a plume, increase for higher recharge rates. Dimensionless plots of capture zone envelopes are presented for a practical well and barrier wall configuration. 相似文献
914.
We study earthquake-induced soft-sediment deformation (seismites) in reference Quaternary sections of southeastern Altai. Sediments in the sections bear signature of liquefaction and fluidization and deformation is localized in thin (few centimeters to 0.5–1.0 m) continuously striking and frequently repeated layers sandwiched between undeformed sediments. The soft-sediment deformation records coseismic motion of different slip geometries. Seismic origin is also inferred for layers and lenses of coarse colluvium slid into the lake bottom from the slopes, which intrude plane-bedded silt and sand and vary in thickness from a few centimeters to one meter. The occurrence of seismic soft-sediment deformation at different stratigraphic levels of the Quaternary and in the Upper Pliocene Beken Formation confirms the high seismicity of southeastern Altai in Quaternary time. 相似文献
915.
916.
Oil- and gas-bearing basins of the World Ocean spreading to the continental shelf and foothill are considered. Large hydrocarbon resources, including oil pools have been discovered in the deep-water basins. The basins are confined to passive continental margins and characterized by the common mechanism of formation. Oil and gas (hereafter, petroleum) generation and accumulation are dictated by the optimum specifics of source and reservoir rocks accumulated under favorable conditions of rifts and deep-sea fans. Halokinesis played an important role in the formation of traps and migration of hydrocarbons. The global experience shows that the northern, eastern, and southern shelves of the Russian seas, as well as their continental slopes and foothills, have a big petroleum potential. 相似文献
917.
Isotope provinces, mechanisms of generation and sources of the continental crust in the Central Asian mobile belt: geological and isotopic evidence 总被引:17,自引:0,他引:17
V. I. Kovalenko V. V. Yarmolyuk V. P. Kovach A. B. Kotov I. K. Kozakov E. B. Salnikova A. M. Larin 《Journal of Asian Earth Sciences》2004,23(5):605-627
The available geological, geochronological and isotopic data on the felsic magmatic and related rocks from South Siberia, Transbaikalia and Mongolia are summarized to improve our understanding of the mechanisms and processes of the Phanerozoic crustal growth in the Central Asian mobile belt (CAMB). The following isotope provinces have been recognised: ‘Precambrian’ (TDM=3.3–2.9 and 2.5–0.9 Ga) at the microcontinental blocks, ‘Caledonian’ (TDM=1.1–0.55 Ga), ‘Hercynian’ (TDM=0.8–0.5 Ma) and ‘Indosinian’ (TDM=0.3 Ga) that coincide with coeval tectonic zones and formed at 570–475, 420–320 and 310–220 Ma. Continental crust of the microcontinents is underlain by, or intermixed with, ‘juvenile’ crust as evidenced by its isotopic heterogeneity. The continental crust of the Caledonian, Hercynian and Indosinian provinces is isotopically homogeneous and was produced from respective juvenile sources with addition of old crustal material in the island arcs or active continental margin environments. The crustal growth in the CAMB had episodic character and important crust-forming events took place in the Phanerozoic. Formation of the CAMB was connected with break up of the Rodinia supercontinent in consequence of creation of the South-Pacific hot superplume. Intraplate magmatism preceding and accompanying permanently other magmatic activity in the CAMB was caused by influence of the long-term South-Pacific plume or the Asian plume damping since the Devonian. 相似文献
918.
An analysis of the flux densities of the 51-60 A + (6.7 GHz) and 20-3?1 E (12.2 GHz) class II methanol maser lines in a large and homogeneous sample of maser sources has been carried out. For convenience, the maser lines were divided into three groups: group I contains spectral features for the lines most prominent in the 51-60 A + (6.7 GHz) transition, group II contains spectral features for the lines strongest in the 20-3?1 E (12.2 GHz) transition, group III contains spectral features for which the velocities of the emission maxima of the two lines coincide. The same dependence was found for group II and group III: log S 6.7=(0.79±0.05)×log S 12.2+(0.79±0.05). The spectral features in group I do not obey this relation, and deviations from a linear dependence are considerably greater. It is suggested that methanol class II masers be divided into a subclass IIa, which has special conditions favoring 6.7 GHz masers, and a subclass IIb, which is comprised of the 12.2 GHz masers and those 6.7 GHz masers that necessarily accompany them under the same conditions. 相似文献
919.
Simanovich I. M. Golovin D. I. Bujakaite M. I. Vinogradov V. I. Sakharov B. A. Matsapulin V. U. Sokolova A. L. Pokrovskaya E. V. 《Lithology and Mineral Resources》2004,39(6):555-565
The influence of geodynamic factors on the postsedimentary lithogenesis of terrigenous sequences during the replacement of the passive continental-margin regime to the active regime is considered with the Toarcian–Aalenian complexes of southern Dagestan as an example. It has been established that clayey rocks were lithified under conditions of subsidence lithogenesis, whereas the orogenic catagenesis of sandy rocks was related to stress initiated by the initial (amagmatic) subduction phase. The Kübler index has been used to reveal the postsedimentary zonality that is consistent with the intensity of folding and cleavage. The metagenesis zone fits the cleavage zone. The Rb–Sr and K–Ar datings of clayey rocks from the metagenesis zone yielded 180–190 Ma that can be interpreted as the timing of the maximal manifestation of postsedimentary lithogenesis. 相似文献
920.
俄罗斯远东金属矿床形成条件的古地球动力学分析 总被引:1,自引:0,他引:1
根据本区地质构造的新资料,提出了区域板块构造模型。研究了从俯冲到加利福尼亚型转换和由后者又到俯冲的古地球动力学环境更替的意义。这种更替发生在对本区最重要的中—新生代历史时期,对区域成矿带整体乃至一些金属矿床的形成具有重要影响。论证了一些地体性质,尤其是俯冲-增生杂岩对矿床形成的重要意义。 相似文献