全文获取类型
| 收费全文 | 588篇 |
| 免费 | 14篇 |
| 国内免费 | 13篇 |
专业分类
| 测绘学 | 24篇 |
| 大气科学 | 69篇 |
| 地球物理 | 124篇 |
| 地质学 | 204篇 |
| 海洋学 | 42篇 |
| 天文学 | 97篇 |
| 综合类 | 2篇 |
| 自然地理 | 53篇 |
出版年
| 2020年 | 9篇 |
| 2018年 | 7篇 |
| 2017年 | 11篇 |
| 2016年 | 13篇 |
| 2015年 | 10篇 |
| 2014年 | 17篇 |
| 2013年 | 29篇 |
| 2012年 | 17篇 |
| 2011年 | 23篇 |
| 2010年 | 21篇 |
| 2009年 | 28篇 |
| 2008年 | 18篇 |
| 2007年 | 27篇 |
| 2006年 | 30篇 |
| 2005年 | 31篇 |
| 2004年 | 24篇 |
| 2003年 | 28篇 |
| 2002年 | 17篇 |
| 2001年 | 16篇 |
| 2000年 | 8篇 |
| 1999年 | 15篇 |
| 1998年 | 11篇 |
| 1997年 | 4篇 |
| 1996年 | 5篇 |
| 1995年 | 7篇 |
| 1994年 | 10篇 |
| 1993年 | 12篇 |
| 1992年 | 4篇 |
| 1991年 | 7篇 |
| 1989年 | 7篇 |
| 1987年 | 8篇 |
| 1986年 | 3篇 |
| 1985年 | 9篇 |
| 1984年 | 9篇 |
| 1983年 | 7篇 |
| 1982年 | 5篇 |
| 1981年 | 11篇 |
| 1980年 | 9篇 |
| 1979年 | 7篇 |
| 1978年 | 5篇 |
| 1977年 | 4篇 |
| 1976年 | 6篇 |
| 1975年 | 12篇 |
| 1974年 | 3篇 |
| 1973年 | 5篇 |
| 1971年 | 3篇 |
| 1970年 | 5篇 |
| 1969年 | 4篇 |
| 1968年 | 5篇 |
| 1967年 | 7篇 |
排序方式： 共有615条查询结果，搜索用时 680 毫秒
81.
Probabilistic estimates of future changes in California temperature and precipitation using statistical and dynamical downscaling 总被引：1，自引：0，他引：1
David W. Pierce Tapash Das Daniel R. Cayan Edwin P. Maurer Norman L. Miller Yan Bao M. Kanamitsu Kei Yoshimura Mark A. Snyder Lisa C. Sloan Guido Franco Mary Tyree 《Climate Dynamics》2013,40(3-4):839-856
Sixteen global general circulation models were used to develop probabilistic projections of temperature (T) and precipitation (P) changes over California by the 2060s. The global models were downscaled with two statistical techniques and three nested dynamical regional climate models, although not all global models were downscaled with all techniques. Both monthly and daily timescale changes in T and P are addressed, the latter being important for a range of applications in energy use, water management, and agriculture. The T changes tend to agree more across downscaling techniques than the P changes. Year-to-year natural internal climate variability is roughly of similar magnitude to the projected T changes. In the monthly average, July temperatures shift enough that that the hottest July found in any simulation over the historical period becomes a modestly cool July in the future period. Januarys as cold as any found in the historical period are still found in the 2060s, but the median and maximum monthly average temperatures increase notably. Annual and seasonal P changes are small compared to interannual or intermodel variability. However, the annual change is composed of seasonally varying changes that are themselves much larger, but tend to cancel in the annual mean. Winters show modestly wetter conditions in the North of the state, while spring and autumn show less precipitation. The dynamical downscaling techniques project increasing precipitation in the Southeastern part of the state, which is influenced by the North American monsoon, a feature that is not captured by the statistical downscaling. 相似文献
82.
To address the demand for high spatial resolution gridded climate data, we have advanced the Daymet point-based interpolation algorithm for downscaling global, coarsely gridded data with additional output variables. The updated algorithm, High-Resolution Climate Downscaler (HRCD), performs very good downscaling of daily, global, historical reanalysis data from 1° input resolution to 2.5 arcmin output resolution for day length, downward longwave radiation, pressure, maximum and minimum temperature, and vapor pressure deficit. It gives good results for monthly and yearly cumulative precipitation and fair results for wind speed distributions and modeled downward shortwave radiation. Over complex terrain, 2.5 arcmin resolution is likely too low and aggregating it up to 15 arcmin preserves accuracy. HRCD performs comparably to existing daily and monthly US datasets but with a global extent for nine daily climate variables spanning 1948–2006. Furthermore, HRCD can readily be applied to other gridded climate datasets. 相似文献
83.
Ronan Higgins David Teyssier Colin Borys Jonathan Braine Claudia Comito Bertrand Delforge Frank Helmich Michael Olberg Volker Ossenkopf John Pearson Russell Shipman 《Experimental Astronomy》2014,37(2):433-452
The Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory is composed of a set of fourteen double sideband mixers. We discuss the general problem of the sideband ratio (SBR) determination and the impact of an imbalanced sideband ratio on the line calibration in double sideband heterodyne receivers. The HIFI SBR is determined from a combination of data taken during pre-launch gas cell tests and in-flight. The results and some of the calibration artefacts discovered in the gas cell test data are presented here along with some examples of how these effects appear in science data taken in orbit. 相似文献
84.
85.
86.
87.
M. Shimon Y. Rephaeli B. W. O'Shea M. L. Norman 《Monthly notices of the Royal Astronomical Society》2006,368(2):511-511
Scattering of the cosmic microwave background (CMB) in clusters of galaxies polarizes the radiation. We explore several polarization components which have their origin in the kinematic quadrupole moments induced by the motion of the scattering electrons, either directed or random. Polarization levels and patterns are determined in a cluster simulated by the hydrodynamical enzo code. We find that polarization signals can be as high as ∼1 μK , a level that may be detectable by upcoming CMB experiments. 相似文献
88.
89.
90.