全文获取类型
收费全文 | 5292篇 |
免费 | 1068篇 |
国内免费 | 1610篇 |
专业分类
测绘学 | 377篇 |
大气科学 | 1109篇 |
地球物理 | 1559篇 |
地质学 | 2492篇 |
海洋学 | 837篇 |
天文学 | 110篇 |
综合类 | 367篇 |
自然地理 | 1119篇 |
出版年
2024年 | 25篇 |
2023年 | 76篇 |
2022年 | 221篇 |
2021年 | 236篇 |
2020年 | 291篇 |
2019年 | 276篇 |
2018年 | 230篇 |
2017年 | 252篇 |
2016年 | 249篇 |
2015年 | 306篇 |
2014年 | 346篇 |
2013年 | 357篇 |
2012年 | 358篇 |
2011年 | 401篇 |
2010年 | 303篇 |
2009年 | 366篇 |
2008年 | 345篇 |
2007年 | 387篇 |
2006年 | 387篇 |
2005年 | 345篇 |
2004年 | 303篇 |
2003年 | 261篇 |
2002年 | 219篇 |
2001年 | 176篇 |
2000年 | 177篇 |
1999年 | 141篇 |
1998年 | 155篇 |
1997年 | 126篇 |
1996年 | 123篇 |
1995年 | 85篇 |
1994年 | 98篇 |
1993年 | 94篇 |
1992年 | 62篇 |
1991年 | 49篇 |
1990年 | 26篇 |
1989年 | 39篇 |
1988年 | 26篇 |
1987年 | 17篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1954年 | 1篇 |
排序方式: 共有7970条查询结果,搜索用时 15 毫秒
71.
A. G. Mavraganis 《Celestial Mechanics and Dynamical Astronomy》1991,51(4):395-405
The almost constant-speed motion of a mass acted upon by a Newtonian attraction and a resisting force is treated. The equation of orbit is derived for a specific type of resistance which covers the familiar case of Danby's drag(=r
–2) whilst the vector invariants are obtained by direct operation on the vector form of the equation of motion. 相似文献
72.
73.
Ice and snow have often helped physicists understand the world. On the contrary it has taken them a very long time to understand the flow of the glaciers. Naturalists only began to take an interest in glaciers at the beginning of the 19th century during the last phase of glacier advances. When the glacier flow from the upslope direction became obvious, it was then necessary to understand how it flowed. It was only in 1840, the year of the Antarctica ice sheet discovery by Dumont d'Urville, that two books laid the basis for the future field of glaciology: one by Agassiz on the ice age and glaciers, the other one by canon Rendu on glacier theory. During the 19th century, ice flow theories, adopted by most of the leading scientists, were based on melting/refreezing processes. Even though the word ‘fluid’ was first used in 1773 to describe ice, more the 130 years would have to go by before the laws of fluid mechanics were applied to ice. Even now, the parameter of Glen's law, which is used by glaciologists to model ice deformation, can take a very wide range of values, so that no unique ice flow law has yet been defined. To cite this article: F. Rémy, L. Testut, C. R. Geoscience 338 (2006). 相似文献
74.
75.
WANG Lei ZHANG Guang-Xin 《湿地科学》2006,4(3):193-197
1 INTRODUCTIONNitrogen and phosphorus in the water are the nu-trients limited in natural wetlands,which seriously in-fluence on the ecosystem production and the biodiver-sity(Mitsch,Grosselin,2000).Nitrogen and phos-phorus recycles have been interrupted b… 相似文献
76.
77.
Porous fence is a kind of artificial windbreak that has many practical applications. The threshold wind velocities at different distances downwind from porous fences were measured and the corresponding characteristics of particle movement observed to assess their shelter effect. It is found that the fence’s porosity is the key factor that determines the resulting shelter effect. The area near a fence can be typically classified into five regions, each with a different mode of particle movement. Dense fences, and especially solid fences, favor the accumulation of sand upwind of the fences. Fences with porosities of 0.3–0.4 produce the maximum threshold wind velocity; those with porosities of 0.3–0.6 (depending on the fence height) provide the maximum effective shelter distance. It is confirmed that the fence porosities of 0.3–0.4 that have been proposed for practical application in previous research are the most effective for abating wind erosion. 相似文献
78.
Morphotectonics and incision of the Kaoping submarine canyon, SW Taiwan orogenic wedge 总被引:1,自引:0,他引:1
The Kaoping submarine canyon developed on the frontal orogenic wedge off SW Taiwan and is the largest one among others. The canyon begins at the mouth of the Kaoping River, crosses the narrow shelf and broad slope region, and finally merges into the northern Manila Trench for a distance of about 260 km. Using reflection seismic sections and bathymetric mapping this paper reveals the geomorphic characteristics of the Kaoping Canyon strongly related to structural and sedimentary processes. The combined morphometry statistics analysis, seismic interpretations of structures and examinations of detailed bathymetric charts indicate that regional canyon morphology is strongly linked to intrusions of mud diapirs in the upper reach of the canyon and thrust faulting in the middle and lower reaches which produce two prominent morphological breaks of the course of the Kaoping Canyon with two sharp bends. Although excavation of floor and enlargement of the Kaoping Canyon are mainly attributed to downslope erosion of seabed, incision of this canyon is also strongly complicated by mud diapiric intrusions (upper reach), westward thrust faults (middle reach), and regional base level tilting (lower reach). The resultant cross-sectional morphology along the Kaoping Canyon changes considerably, ranging from U-shaped, broad V-shaped, to irregular troughs. The Kaoping Canyon may be served as a variant of canyon model of active margins with a distinct morphology of two sharp bends along the canyon course associated with structure deformation. 相似文献
79.
The relationship between depth, age and gravity in the oceans 总被引:2,自引:0,他引:2
80.
Comparison of methods to model the gravitational gradients from topographic data bases 总被引:7,自引:0,他引:7
A number of methods have been developed over the last few decades to model the gravitational gradients using digital elevation data. All methods are based on second-order derivatives of the Newtonian mass integral for the gravitational potential. Foremost are algorithms that divide the topographic masses into prisms or more general polyhedra and sum the corresponding gradient contributions. Other methods are designed for computational speed and make use of the fast Fourier transform (FFT), require a regular rectangular grid of data, and yield gradients on the entire grid, but only at constant altitude. We add to these the ordinary numerical integration (in horizontal coordinates) of the gradient integrals. In total we compare two prism, two FFT and two ordinary numerical integration methods using 1" elevation data in two topographic regimes (rough and moderate terrain). Prism methods depend on the type of finite elements that are generated with the elevation data; in particular, alternative triangulations can yield significant differences in the gradients (up to tens of Eötvös). The FFT methods depend on a series development of the topographic heights, requiring terms up to 14th order in rough terrain; and, one popular method has significant bias errors (e.g. 13 Eötvös in the vertical–vertical gradient) embedded in its practical realization. The straightforward numerical integrations, whether on a rectangular or triangulated grid, yield sub-Eötvös differences in the gradients when compared to the other methods (except near the edges of the integration area) and they are as efficient computationally as the finite element methods. 相似文献