全文获取类型
| 收费全文 | 292篇 |
| 免费 | 1篇 |
| 国内免费 | 1篇 |
专业分类
| 测绘学 | 5篇 |
| 大气科学 | 7篇 |
| 地球物理 | 51篇 |
| 地质学 | 145篇 |
| 海洋学 | 19篇 |
| 天文学 | 57篇 |
| 自然地理 | 10篇 |
出版年
| 2022年 | 3篇 |
| 2021年 | 9篇 |
| 2020年 | 10篇 |
| 2019年 | 7篇 |
| 2018年 | 11篇 |
| 2017年 | 15篇 |
| 2016年 | 15篇 |
| 2015年 | 6篇 |
| 2014年 | 25篇 |
| 2013年 | 20篇 |
| 2012年 | 16篇 |
| 2011年 | 20篇 |
| 2010年 | 11篇 |
| 2009年 | 15篇 |
| 2008年 | 21篇 |
| 2007年 | 25篇 |
| 2006年 | 15篇 |
| 2005年 | 9篇 |
| 2004年 | 1篇 |
| 2003年 | 5篇 |
| 2002年 | 2篇 |
| 2001年 | 7篇 |
| 2000年 | 4篇 |
| 1998年 | 4篇 |
| 1997年 | 1篇 |
| 1996年 | 1篇 |
| 1995年 | 2篇 |
| 1994年 | 1篇 |
| 1993年 | 1篇 |
| 1988年 | 1篇 |
| 1986年 | 1篇 |
| 1980年 | 2篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1976年 | 3篇 |
| 1969年 | 1篇 |
| 1962年 | 1篇 |
| 1958年 | 1篇 |
排序方式： 共有294条查询结果，搜索用时 15 毫秒
81.
82.
We analyze the errors of airborne radiometric measurements of the infrared upwelling radiation I
x of the surface performed using conventional and modified procedures (with calibrators in the form of flat reflecting mirror-like surfaces oriented to reflect the measured radiation I
x to the radiometer in the process of calibration) for the modes of operation of a radiometer with and without thermostatic control. We propose relations for finding I
x as well as for the instrumental and procedural errors and give recommendations for their reduction. It is shown that the modified procedure leads to smaller errors than the conventional procedure. 相似文献
83.
84.
85.
86.
The changes in the field of the Arabian Sea level anomaly and the geostrophic currents are analyzed based on the data of satellite altimetry measurements in 1993–2008 within the framework of the AVISO project. On the intra-annual scale, the current field generally agrees with the circulation schemes published in a number earlier works. Their differences are due to the occurrence of the mesoscale eddies and jet currents revealed by the authors. 相似文献
87.
88.
89.
A. V. Andronova M. A. Iordanskii A. V. Trefilova V. A. Lebedev V. M. Minashkin Yu. I. Obvintsev M. S. Artamonova I. G. Granberg 《Izvestiya Atmospheric and Oceanic Physics》2011,47(7):819-827
The results of simultaneous investigations of atmospheric aerosol in two large megalopolises—Moscow and Beijing—are presented.
The purpose of these investigations was to compare parameters and reveal common characteristics of urban aerosols. Aerosol
parameters were measured in the megalopolises simultaneously from October 23, 2007, through November 2, 2007. The mass concentrations
of aerosols were measured continuously with a nephelometer (Mosscow) and discretely with the use of aspiration samplers according
to the weight method (Moscow, Beijing). The number concentration and the particle size distribution function were determined
with analyzers of the size spectrum in the interval 0.15–15.0 μm and were measured synchronously with sampling for elementary
analysis. The elementary compositions of samples were determined by mass spectrometry, which made it possible to identify
60 chemical elements. 相似文献
90.
Based on archival Hubble Space Telescope ACS/WFC images, we have performed stellar photometry for the metal-poor galaxy DDO 68. The apparent distributions of stars of different ages and stellarmetallicity determinations indicate that DDO68 is a systemof two galaxies that have different stellar metallicities (Z = 0.004 and 0.001) and are in the stage of interaction or merging. We have determined the distance to DDO 68, D = 12.0 ± 0.3 Mpc, which differs significantly from previous estimates of the distance to this system. A concentration of red giants is observed outside DDO 68. This can be interpreted as the periphery of a partially visible low-surface-brightness galaxy located at the same distance as DDO 68. Comparison of the constructed CM diagrams with theoretical isochrones from Bertelli et al. has allowed us to determine that the age of each galaxy is at least 10 Gyr. 相似文献