全文获取类型
收费全文 | 8123篇 |
免费 | 1935篇 |
国内免费 | 1747篇 |
专业分类
测绘学 | 760篇 |
大气科学 | 1380篇 |
地球物理 | 3015篇 |
地质学 | 3928篇 |
海洋学 | 879篇 |
天文学 | 504篇 |
综合类 | 700篇 |
自然地理 | 639篇 |
出版年
2024年 | 35篇 |
2023年 | 85篇 |
2022年 | 201篇 |
2021年 | 266篇 |
2020年 | 283篇 |
2019年 | 368篇 |
2018年 | 268篇 |
2017年 | 301篇 |
2016年 | 324篇 |
2015年 | 396篇 |
2014年 | 439篇 |
2013年 | 512篇 |
2012年 | 530篇 |
2011年 | 561篇 |
2010年 | 425篇 |
2009年 | 571篇 |
2008年 | 491篇 |
2007年 | 633篇 |
2006年 | 566篇 |
2005年 | 446篇 |
2004年 | 436篇 |
2003年 | 408篇 |
2002年 | 362篇 |
2001年 | 305篇 |
2000年 | 327篇 |
1999年 | 311篇 |
1998年 | 285篇 |
1997年 | 281篇 |
1996年 | 266篇 |
1995年 | 203篇 |
1994年 | 198篇 |
1993年 | 171篇 |
1992年 | 130篇 |
1991年 | 90篇 |
1990年 | 87篇 |
1989年 | 72篇 |
1988年 | 56篇 |
1987年 | 35篇 |
1986年 | 15篇 |
1985年 | 11篇 |
1984年 | 11篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Accurate upward continuation of gravity anomalies supports future precision, free-inertial navigation systems, since the latter
cannot by themselves sense the gravitational field and thus require appropriate gravity compensation. This compensation is
in the form of horizontal gravity components. An analysis of the model errors in upward continuation using derivatives of
the standard Pizzetti integral solution (spherical approximation) shows that discretization of the data and truncation of
the integral are the major sources of error in the predicted horizontal components of the gravity disturbance. The irregular
shape of the data boundary, even the relatively rough topography of a simulated mountainous region, has only secondary effect,
except when the data resolution is very high (small discretization error). Other errors due to spherical approximation are
even less important. The analysis excluded all measurement errors in the gravity anomaly data in order to quantify just the
model errors. Based on a consistent gravity field/topographic surface simulation, upward continuation errors in the derivatives
of the Pizzetti integral to mean altitudes of about 3,000 and 1,500 m above the mean surface ranged from less than 1 mGal
(standard deviation) to less than 2 mGal (standard deviation), respectively, in the case of 2 arcmin data resolution. Least-squares
collocation performs better than this, but may require significantly greater computational resources. 相似文献
972.
青藏高原雷暴云降水与地面电场的观测和数值模拟 总被引:4,自引:7,他引:4
在2003年青藏高原那曲地区夏季雷暴云的观测试验中,三次伴有降水的过程中都出现了地面电场(Egnd)随降水的漂移现象,而且固态和液态降水对Egnd的极性改变并不相同。为了模拟再现高原雷暴云降水和Egnd之间的关系,选取了8月13日这次具有高原雷暴代表性特征的过程,模拟了雷暴云移经观测点上空期间,测站固、液态降水与Egnd的变化以及雷暴云下部正电荷区的空间分布。模拟的Egnd及固、液态降水与其的对应关系与观测事实较一致。分析结果表明,固态降水主要携带正电荷,液态降水主要携带负电荷,各类带不同极性和数量电荷的降水粒子常共存在雷暴云中,Egnd主要受携带电荷量占主导地位的降水粒子的影响,地面出现强正电场时正好是云在当顶并且地面出现强固态降水的时间。 相似文献
973.
974.
975.
976.
In order to predict wind loading on trees (canopy height h) in partially harvested forests, it is necessary to characterize air flow and momentum transfer in progressively more complex
patterns where groups of trees (or aggregates) are retained. In this study, we used large-eddy simulation to explore the effects
of aggregate size, inter-aggregate spacing, and the ratio between the aggregate size and inter-aggregate spacing on air flow
and momentum transfer. Forty-five grid points across an aggregate were needed to achieve an adequate level of turbulence.
Using grid sizes of h/15 throughout was too viscous for the smaller aggregates. Vertical and horizontal flow deflection by the leading aggregates
sheltered some of the downstream aggregates to varying degrees where turbulence increased for subsequent rows. The number
of rows of protected aggregates decreased as aggregate dimensions and the space between aggregates increased. A theoretical
treatment of time-dependent wind is presented for the lead aggregate and a simulation case is presented for the case of a
gust of reduced wind passing through the aggregate pattern. The leading aggregate responded with decreasing moment for decreasing
ambient wind speed as predicted by theory. However, downwind aggregates experienced substantial increases in bending moment.
The overall results of the disruptive aspects of time dependence agrees with arguments regarding the role of irrotational
(potential) flow to this problem. Our treatment of retention pattern design is only a first step and further research suggestions
are presented. 相似文献
977.
978.
基于k阶Voronoi多边形划分的k阶数据场拟合 总被引:2,自引:1,他引:2
讨论了k阶Voronoi图的离散点集的生成算法,挖掘了k阶Voronoi图的性质并加以证明;参照k阶Voronoi图的定义提出了k阶空间数据场的定义,并结合参考点利用其影响因子给出了低阶空间数据场的拟合函数通式;利用k阶Voronoi图对平面空间的平面区域最近邻近划分实现了对空间数据场的分割,从而将大量参考点集数据场化解为多个单元数据场的低阶拟舍,有效地降低了数据场拟舍的难度;提出了合并拟合和叠加拟合策略,实现了将单元数据场综合为完整的空间数据场。 相似文献
979.
《国际泥沙研究》2020,35(6):659-665
A turbidity current is a particle-laden current driven by density differences due to suspended sediment particles. Turbidity currents can transport large amounts of sediment down slopes over great distances, and play a significant role in fluvial, lake and submarine systems. To better understand the sediment transport process, the flow system of an experimentally produced turbidity current in an inclined flume was investigated using video processing. We observed that the current progresses with constant frontal velocity and maintains an unchanged global interface geometry. In addition, the spatio-temporal profiles of the inner mean and turbulence velocity obtained by ultrasound velocity profiler (UVP) showed that similar distributions were maintained, with low dissipation. The results indicate that the turbidity current progressed in a quasi-stationary state, which enabled long-distance sediment transport. To understand the mechanisms behind the quasi-stationary flow, we analyzed the forces acting on the turbidity current. We found that under particular densities of suspended particles, the gravitational force is balanced by the viscous forces along the slope direction. We conclude that this specific force balance induces the quasi-stationary flow structure, enabling the long-distance transport of a substantial amount of sediment downstream with low dissipation. 相似文献
980.
昆明机场残积红土既是区域内重要的土地资源,更是各类工程建设的建筑地基,由于机场及临近区域内小江地震活动断裂带和普渡河断裂带地震活动频繁,使研究区处于较不稳定状态。本文采用MIDAS GTS有限元数值分析软件,利用动三轴试验所得出的结果,分别对昆明长水国际机场玄武岩残积红土、砂页岩残积红土地层下典型的地下结构进行了抗震模拟研究。所获得的研究成果,对红土分布区城市及村镇房屋建筑地基和地下空间结构抗震安全稳定性评价具有一定的指导意义和实用价值。 相似文献