全文获取类型
收费全文 | 762篇 |
免费 | 110篇 |
国内免费 | 171篇 |
专业分类
测绘学 | 95篇 |
大气科学 | 365篇 |
地球物理 | 87篇 |
地质学 | 124篇 |
海洋学 | 111篇 |
天文学 | 18篇 |
综合类 | 163篇 |
自然地理 | 80篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 21篇 |
2021年 | 22篇 |
2020年 | 22篇 |
2019年 | 32篇 |
2018年 | 23篇 |
2017年 | 18篇 |
2016年 | 24篇 |
2015年 | 34篇 |
2014年 | 68篇 |
2013年 | 44篇 |
2012年 | 62篇 |
2011年 | 65篇 |
2010年 | 50篇 |
2009年 | 57篇 |
2008年 | 46篇 |
2007年 | 60篇 |
2006年 | 59篇 |
2005年 | 49篇 |
2004年 | 33篇 |
2003年 | 40篇 |
2002年 | 33篇 |
2001年 | 16篇 |
2000年 | 25篇 |
1999年 | 24篇 |
1998年 | 12篇 |
1997年 | 13篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 10篇 |
1993年 | 7篇 |
1992年 | 2篇 |
1991年 | 11篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 8篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 3篇 |
排序方式: 共有1043条查询结果,搜索用时 15 毫秒
991.
GPS伪距测量方程的相对论修正 总被引:4,自引:0,他引:4
应用广义相对论测量理论,对GPS伪距测量方程进行了严格证明,并得到它的修正公式。这个公式既不违背相对论理论又与实验事实相符,从而认为GPS伪距测量是对相对论理论的验证。 相似文献
992.
介绍了地理信息系统(GIG)在四川省雷电业务系统构建中的应用方法。四川省防雷中心在雷电监测新技术和新手段的基础上,将GIS技术与雷电潜势预报和短临预警技术有效的结合起来,构建了雷电业务应用系统。并通过对此系统在2,008年“9.23”四川雷电天气过程中的应用分析,说明此系统可以准确地对未来12小时的雷电过程进行预报和未来1小时的雷电过程进行预警。 相似文献
993.
994.
995.
Steven R. Hanna Clinton P. MacDonald Mark Lilly Charles Knoderer C.H. Huang 《Estuarine, Coastal and Shelf Science》2006,70(4):541
Boundary layer observations were made over the Gulf of Mexico over a 3-year period in order to develop and test methods for estimating surface fluxes and boundary layer wind fields. In addition to routinely available buoy and CMAN surface data, six 915 MHz radar wind profilers (RWPs) and RASS profilers were mounted on oil platforms and on the shore. Estimates of surface momentum, sensible heat, and latent heat fluxes have been made from the surface observations using the COARE software. Simulations by the National Weather Service's Eta meteorological model are compared with the observations of surface fluxes and wind profiles. The boundary layer is found to be unstable over 90% of the time, and latent heat fluxes are about five to ten times larger than sensible heat fluxes, as usually found over tropical oceans. Eta model simulations of surface fluxes are within about ±50% of COARE estimates of the fluxes based on surface observations. Most of the time, COARE-derived fluxes at 11 sites are within a factor of two of each other at any given hour. In multi-day case studies, COARE calculations are found to agree with Eta model simulations of these fluxes and parameters within a factor of two most of the time. Eta model simulations of wind speeds in the boundary layer tend to exceed the RWP observations by 1–2 m s−1 near shore and by 2–6 m s−1 at distances of 100–200 km offshore. 相似文献
996.
孟庆珍 《成都信息工程学院学报》2003,18(4):393-397
对国家标准HJ/T2.2-93大气稳定度分级中整数风速使用问题,日、夜分界问题及太阳倾角取值问题进行了综合研究。大量统计结果指出,整数风速不能直接按标准中稳定度等级规定的风速分级带入,而应以1/2计数法代入分级;日、夜分界应以日出后1小时与日落前1小时为界,太阳倾角每10日取一概略值已十分精确。 相似文献
997.
998.
QIE Xiushu 《大气科学进展》2012,29(5):993-1005
Atmospheric electricity is composed of a wide range of electric phenomena in the troposphere, strato- sphere, and even lower ionosphere. Research progress on atmospheric electricity in the past 5 years in China are briefly reviewed here. This research area has been greatly expanded through rocket-triggered lightning experiments and the increased use of high spatio-temporal resolution techniques for the detection and location of lightning. The main results described in this review are summarized in the following five aspects:(1) processes and parameters inferred from rocket-triggered lightning, (2) lightning physics and effects (observations and theoretical study), (3) lightning activities associated with different thunderstorms, (4) charge structure of thunderstorms (observations and simulation), and (5) the VHF/UHF lightning location techniques and discharge channel mapping. 相似文献
999.
1000.
Jacob Padro 《Pure and Applied Geophysics》1977,115(3):473-489
An attempt is made to use the barotropic vorticity equation in spectral form in order to study barotropic instability when the basic current has east-west quasi-stationary asymmetries on the scale of long waves. This is done by expressing the spectral equations in three different ways. In the first experiment a 9-component system is integrated and the long waves are allowed to propagate freely. In the second experiment the long waves are constrained to propagate slowly and in the third experiment, they are removed altogether.The motivation behind the present investigation is due to observations made in the motion fields of the tropics. These are characterized by quasi-stationary long waves and very energetically active and propagating short waves.The presence of quasi-stationary long waves seems to enhance the energy exchanges between the short waves and the mean zonal current and also allow for larger energy values for the short waves. Long term integration (90 days) shows a 6-day mode in thev time spectra at latitude 10°N and a 15-day mode in theu time spectra at individual grid points in the equatorial latitudes. Any possible connection between this peak and the observed peak of 15 days in the completely different physics of Kelvin waves is left as a conjecture. 相似文献