全文获取类型
收费全文 | 1692篇 |
免费 | 158篇 |
国内免费 | 142篇 |
专业分类
测绘学 | 577篇 |
大气科学 | 79篇 |
地球物理 | 298篇 |
地质学 | 331篇 |
海洋学 | 128篇 |
天文学 | 134篇 |
综合类 | 164篇 |
自然地理 | 281篇 |
出版年
2024年 | 2篇 |
2023年 | 15篇 |
2022年 | 34篇 |
2021年 | 54篇 |
2020年 | 53篇 |
2019年 | 61篇 |
2018年 | 47篇 |
2017年 | 82篇 |
2016年 | 77篇 |
2015年 | 79篇 |
2014年 | 88篇 |
2013年 | 114篇 |
2012年 | 86篇 |
2011年 | 93篇 |
2010年 | 70篇 |
2009年 | 109篇 |
2008年 | 103篇 |
2007年 | 123篇 |
2006年 | 94篇 |
2005年 | 72篇 |
2004年 | 62篇 |
2003年 | 69篇 |
2002年 | 60篇 |
2001年 | 42篇 |
2000年 | 46篇 |
1999年 | 42篇 |
1998年 | 29篇 |
1997年 | 25篇 |
1996年 | 27篇 |
1995年 | 21篇 |
1994年 | 16篇 |
1993年 | 16篇 |
1992年 | 14篇 |
1991年 | 13篇 |
1990年 | 3篇 |
1989年 | 17篇 |
1988年 | 12篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有1992条查询结果,搜索用时 18 毫秒
91.
92.
Coseismic and post-seismic signatures of the Sumatra 2004 December and 2005 March earthquakes in GRACE satellite gravity 总被引:2,自引:0,他引:2
Isabelle Panet Valentin Mikhailov Michel Diament Fred Pollitz Geoffrey King Olivier de Viron Matthias Holschneider Richard Biancale Jean-Michel Lemoine 《Geophysical Journal International》2007,171(1):177-190
The GRACE satellite mission has been measuring the Earth's gravity field and its temporal variations since 2002 April. Although these variations are mainly due to mass transfer within the geofluid envelops, they also result from mass displacements associated with phenomena including glacial isostatic adjustment and earthquakes. However, these last contributions are difficult to isolate because of the presence of noise and of geofluid signals, and because of GRACE's coarse spatial resolution (>400 km half-wavelength). In this paper, we show that a wavelet analysis on the sphere helps to retrieve earthquake signatures from GRACE geoid products. Using a wavelet analysis of GRACE geoids products, we show that the geoid variations caused by the 2004 December ( M w = 9.2) and 2005 March ( M w = 8.7) Sumatra earthquakes can be detected. At GRACE resolution, the 2004 December earthquake produced a strong coseismic decrease of the gravity field in the Andaman Sea, followed by relaxation in the area affected by both the Andaman 2004 and the Nias 2005 earthquakes. We find two characteristic timescales for the relaxation, with a fast variation occurring in the vicinity of the Central Andaman ridge. We discuss our coseismic observations in terms of density changes of crustal and upper-mantle rocks, and of the vertical displacements in the Andaman Sea. We interpret the post-seismic signal in terms of the viscoelastic response of the Earth's mantle. The transient component of the relaxation may indicate the presence of hot, viscous material beneath the active Central Andaman Basin. 相似文献
93.
P. Novák 《Studia Geophysica et Geodaetica》2007,51(3):351-367
Satellite missions CHAMP and GRACE dedicated to global mapping of the Earth’s gravity field yield accurate satellite-to-satellite
tracking (SST) data used for recovery of global geopotential models usually in a form of a finite set of Stokes’s coefficients.
The US-German Gravity Recovery And Climate Experiment (GRACE) yields SST data in both the high-low and low-low mode. Observed
satellite positions and changes in the intersatellite range can be inverted through the Newtonian equation of motion into
values of the unknown geopotential. The geopotential is usually approximated in observation equations by a truncated harmonic
series with unknown coefficients. An alternative approach based on integral inversion of the SST data of type GRACE into discrete
values of the geopotential at a geocentric sphere is discussed in this article. In this approach, observation equations have
a form of Green’s surface integrals with scalar-valued integral kernels. Despite their higher complexity, the kernel functions
exhibit features typical for other integral kernels used in geodesy for inversion of gravity field data. The two approaches
are discussed and compared based on their relative advantages and intended applications. The combination of heterogeneous
gravity data through integral equations is also outlined in the article.
panovak@kma.zcu.cz 相似文献
94.
95.
中国新一代高精度、高分辨率大地水准面的研究和实施 总被引:13,自引:2,他引:13
采用移去恢复技术,利用我国高分辨率DTM和重力资料推算我国大陆重力大地水准面;然后再和我国GPS水准所构成的高程异常控制网拟合,推算了具有dm级精度、15′×15′分辨率的我国大陆大地水准面。利用全国地壳运动监测网络的80余个高精度GPS水准点进行外部检核,检核结果证实和原设计精度完全一致,即该大陆大地水准面的绝对精度,在东经102°以东高于±0.3m,在东经102°以西、北纬36°以北为±0.4m,36°以南为±(0.4~0.6)m。利用卫星测高数据计算垂线偏差,反解我国海域大地水准面。为了检核,由测高垂线偏差反演为重力异常,与海上万余点船测重力值进行了外部检核;同时用上述反演的重力异常推算大地水准面,与直接解得的相应结果进行比较作为内部检核。由重力和GPS水准数据推算的上述大陆大地水准面,和主要由卫星测高数据确定的海洋大地水准面,二者之间一般都存在以系统误差为主的拼接差。顾及这一现象并结合我国在陆海大地水准面拼接区重力资料稀疏的实际,研究提出了扩展拼接技术,即在沿海选取部分陆海毗邻的局部地区,在这局部地区内,陆地用实测平均重力格网数据,海洋用测高平均重力格网数据,统一推算这陆海局部重力大地水准面。然后利用这一局部大地水准面的陆地部分和已经用GPS水准校正的陆地大地水准面进行拟合。最后用拟合参数校正中国全部海域的测高重力大地水准面,从而保持陆地部分大地水准面不变,最大限度地削弱拼接点和测高海洋大地水准面的系统误差。 相似文献
96.
In this paper an intervening opportunities model with spatial dominance is developed. The usual assumption in spatial theory
is that decision makers are influenced not just by the size of a destination or distance but by these two factors in combination, that is, spatial dominance. Decision-makers will have more knowledge about, and clearly perceive destinations that exert
the greatest amount of spatial dominance on their origins, just as they would primate cities. Thus destinations are ranked
in terms of the spatial dominance calculated for each destination. Empirical verification of the model utilizes state-to-state
migration flow data for the US. Calibration results compare favourably with the traditional intervening opportunities model
and the production constrained gravity model.
Received: 7 October 1999/Accepted: 15 June 2000 相似文献
97.
98.
Timothy J. Beechie 《地球表面变化过程与地形》2001,26(9):1025-1034
Measurements of annual travel distance (Lb) of bed load sediment at 16 locations in Alaska, the intermountain USA, west coast USA and Scotland are strongly correlated with bankfull channel width (r2 = 0·86, p < 0·001). Travel distance of particles is probably limited by trapping in bars, which have a longitudinal spacing proportional to channel width. Increased abundance of woody debris reduces bar spacing and may reduce Lb. Longer cumulative duration of bed load transporting flows in a year appears to increase Lb. Other predictors of annual travel distance such as stream power per unit length, drainage area and bankfull discharge were less well correlated with Lb (r2 ranging from 0·27 to 0·51). Stream power per unit bed area, basal shear stress and slope were not significantly related to Lb (r2 < 0·05). Most correlations were improved when regressions were limited to data from the west coast USA. Travel distance estimates can be used to help identify reaches that may take longer to recover from large, short‐term increases in sediment supply. Published in 2001 by John Wiley & Sons, Ltd. 相似文献
99.
Deep-crustal earthquakes in the southern Baltic Shield 总被引:1,自引:0,他引:1
Ronald Arvidsson Rutger Wahlström Ota Kulhánek 《Geophysical Journal International》1992,108(3):767-777
100.
The dynamics of thin shells with variable viscosity and the origin of toroidal flow in the mantle 总被引:4,自引:0,他引:4
Neil M. Ribe 《Geophysical Journal International》1992,110(3):537-552