全文获取类型
收费全文 | 1986篇 |
免费 | 436篇 |
国内免费 | 584篇 |
专业分类
测绘学 | 367篇 |
大气科学 | 395篇 |
地球物理 | 529篇 |
地质学 | 865篇 |
海洋学 | 311篇 |
天文学 | 20篇 |
综合类 | 211篇 |
自然地理 | 308篇 |
出版年
2024年 | 8篇 |
2023年 | 40篇 |
2022年 | 76篇 |
2021年 | 111篇 |
2020年 | 108篇 |
2019年 | 105篇 |
2018年 | 107篇 |
2017年 | 115篇 |
2016年 | 128篇 |
2015年 | 113篇 |
2014年 | 172篇 |
2013年 | 161篇 |
2012年 | 171篇 |
2011年 | 171篇 |
2010年 | 137篇 |
2009年 | 131篇 |
2008年 | 147篇 |
2007年 | 163篇 |
2006年 | 137篇 |
2005年 | 93篇 |
2004年 | 97篇 |
2003年 | 82篇 |
2002年 | 67篇 |
2001年 | 56篇 |
2000年 | 54篇 |
1999年 | 42篇 |
1998年 | 44篇 |
1997年 | 32篇 |
1996年 | 33篇 |
1995年 | 14篇 |
1994年 | 15篇 |
1993年 | 18篇 |
1992年 | 12篇 |
1991年 | 8篇 |
1990年 | 10篇 |
1989年 | 10篇 |
1988年 | 8篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1978年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有3006条查询结果,搜索用时 139 毫秒
131.
In this paper, the adaptive chirplet decomposition combined with the Wigner-Ville transform and the empirical mode decomposition combined with the Hilbert transform are employed to process various non-stationary signals (strong ground motions and structural responses). The efficacy of these two adaptive techniques for capturing the temporal evolution of the frequency content of specific seismic signals is assessed. In this respect, two near-field and two far-field seismic accelerograms are analyzed. Further, a similar analysis is performed for records pertaining to the response of a 20-story steel frame benchmark building excited by one of the four accelerograms scaled by appropriate factors to simulate undamaged and severely damaged conditions for the structure. It is shown that the derived joint time–frequency representations of the response time histories capture quite effectively the influence of non-linearity on the variation of the effective natural frequencies of a structural system during the evolution of a seismic event; in this context, tracing the mean instantaneous frequency of records of critical structural responses is adopted.The study suggests, overall, that the aforementioned techniques are quite viable tools for detecting and monitoring damage to constructed facilities exposed to seismic excitations. 相似文献
132.
The paper focuses on the seismic response of walls in dual (frame + wall) structures, with particular emphasis on shear behaviour.
Although dual structures are widely used in earthquake-resistant medium-rise and high-rise buildings, the provisions of modern
seismic codes regarding design of walls for shear are not fully satisfactory, particularly in the (common) case that walls
of substantially different length form part of the same structure. Relevant provisions of the leading seismic codes are first
summarised and their limitations discussed. Then an extensive parametric study is presented, involving two multistorey dual
systems, one with identical walls, and one with walls with unequal length, designed to the provisions of Eurocode 8 for two
different ductility classes (H and M). The walls of the same structures are also designed to other methods such as those used
in New Zealand and Greece. The resulting different designs are then assessed by subjecting the structures to a suite of strong
ground motions, carrying out inelastic time history analysis, and comparing the results against design action effects. It
is found that although modern code procedures generally lead to satisfactory performance (differences among them do exist),
the design of walls seems to be less appropriate in the case of unequal length walls. For this case a modified procedure is
proposed, consisting of an additional factor to account for the relative contribution of walls of the same length to the total
base and an improved envelope of wall shears along the height; this improved method seems to work better than the other procedures
evaluated herein, but further calibration is clearly required. 相似文献
133.
134.
135.
136.
Silke WIEPRECHT Department of Geology Groundwater Morphology German Federal Institute of Hydrology Koblenz Germany 《国际泥沙研究》2001,16(2)
1 INTRODUCTIONFor the pmpose of river restoration of the river Isar in the city area of Munich several inveshgationswere cAned out at the InshtUte for Hydrosciences, German Armed Forces University Munich. The calculation ofwater level for the differnt planned variants were realized by a 2d mathematical model. Although thesesimulahons were a very helpfol basis for fuIther planing, a physical model was constrUcted in order toinvestigate detalled problems.The main interest was focussed … 相似文献
137.
Arnol'd Nonlinear Stability Theorems and their Application to the Atmosphere and Oceans 总被引:2,自引:0,他引:2
Within the context of atmospheric and oceanic fluid dynamicsthe problems of nonlinear stability and instability, particularlythe Arnol'd second type nonlinear stability, are surveyed.The stability criteria obtained by means of the energy-Casimirand energy-Lagrange methods are presented for a varietyof models, the estimates for various generalized perturbationenergy and enstrophy are given. Potential applications of thesecriteria are shown in the estimation of bounds on the perturbationenergy and enstrophy, in the diagnostic study of the persistence orbreakdown of jet flows in the middle and high latitudes, and in theverification of the validity of the tangent linear model in bothatmospheric dynamics and oceanography.Some further research results are also highlighted. 相似文献
138.
燕山式板内造山作用在北京西山的 总被引:6,自引:0,他引:6
尽管在造山模式、成因机制方面存在分歧,但板内造山作用及其表现特征在现阶段业已引起众多学者的关注并进行了深入研究。受到燕山式板内造山带研究思路和成果的启示,经对比研究认为,北京西山地区在大地构造位置、大地构造属性及大地构造演化等方面具有板内造山的特征;逆冲推覆构造、变质核杂岩及独特的区域构造组合样式等构成了该区燕山式板内造山的基本地质构造要素;基于北京西山的地质实践,提出了对用板内造山的观点在该区深入研究若干新方向。 相似文献
139.
热带和热带外海表温度异常与低空环流特征比较 总被引:9,自引:7,他引:9
利用旋转主分量方法(RPC),在对西太平洋和印度洋1980年1月至1988年9月共105个月的月平均海表温度(SST)进行分析的基础上,提取热带模及高纬模两种SST异常(SSTA)分布。再通过分析同期850hPa,各气象要素在该两模上的投影,比较低层大气与不同纬度上SSTA相联系的异常特征。结果表明,无论是热带还是热带外地区,暖性SSTA上空均有正的水汽异常及平均流场对月平均水汽输送的异常辐合。两地区SSTA上空850hPa月平均异常的最重要差异表现在流场、高度场及温度场上。热带正SSTA上方850hPa位势高度及温度均为负距平,流场呈Gill型的气旋式异常环流。热带外正SSTA上方850hPa高度及温度均为正距平,流场则呈反气旋式异常环流。分析表明,高纬度的这种异常特征主要是由于中高纬度大气的地转性和斜压性较强所致。 相似文献
140.
中子仪测定土壤湿度田间标定方法初探 总被引:4,自引:1,他引:4
《农业气象观测规范》规定:应用中子仪测定土壤湿度前必须进行田间标定,在实践中发现其标定方法时间局限性强,工作难度大,且存在客观误差,而采用分段标定时间,改变标定地点的方法,有效地解决了上述不足。 相似文献