全文获取类型
收费全文 | 122篇 |
免费 | 5篇 |
国内免费 | 9篇 |
专业分类
测绘学 | 3篇 |
大气科学 | 28篇 |
地球物理 | 29篇 |
地质学 | 22篇 |
海洋学 | 25篇 |
天文学 | 25篇 |
综合类 | 2篇 |
自然地理 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 15篇 |
2015年 | 6篇 |
2014年 | 6篇 |
2013年 | 9篇 |
2012年 | 9篇 |
2011年 | 6篇 |
2010年 | 8篇 |
2009年 | 6篇 |
2008年 | 5篇 |
2007年 | 6篇 |
2006年 | 6篇 |
2005年 | 7篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1996年 | 1篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 15 毫秒
51.
Sang-hyeon Ahn 《Earth, Moon, and Planets》2004,95(1-4):63-68
We have analyzed the meteor records in the chronicles of the east Asian countries, especially the Korean records. Our results
show that the seasonal variation of sporadic meteors has persisted at least for the last two millennia. We also observed the
prominent showers such as the Perseids and the Leonids, which are formed by Halley-type comets. We obtained the regression
rate of nodal points for the Leonids to be approximately 1.52± 0.04 days per century. 相似文献
52.
It is shown that the power ε generated by the solar wind-magnetosphere dynamo is transmitted to the convective motion of magnetospheric plasma. This convective motion generates what we may call the “Pedersen counterpart currents” in the magnetosphere and drives a large part of the “region 1 and 2” field-aligned currents which are closed by the Pedersen currents in the ionosphere. These results are based on a self-consistent set of the ionospheric current and potential distribution patterns obtained from a study of the International Magnetosphere Study Alaska meridian chain data. 相似文献
53.
安性栽 《广东海洋大学学报》2005,25(2):103-107
通过对《孔疏》标“兴”之特点与《毛诗传》《郑笺》标“兴”之特点比较分析,提出《孔疏》之标“兴”主要着眼于“兴”与作品主旨之间的关系,而没有特别注重标“兴”的位置。这些特点使得《孔疏》之“兴”开始从政治化逐渐转向文学化。 相似文献
54.
Jongchul Chae Hyung-Min Park Kwangsu Ahn Heesu Yang Young-Deuk Park Jakyoung Nah Bi Ho Jang Kyung-Suk Cho Wenda Cao Philip R. Goode 《Solar physics》2013,288(1):1-22
For high resolution spectral observations of the Sun – particularly its chromosphere, we have developed a dual-band echelle spectrograph named Fast Imaging Solar Spectrograph (FISS), and installed it in a vertical optical table in the Coudé Lab of the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. This instrument can cover any part of the visible and near-infrared spectrum, but it usually records the Hα band and the Ca ii 8542 Å band simultaneously using two CCD cameras, producing data well suited for the study of the structure and dynamics of the chromosphere and filaments/prominences. The instrument does imaging of high quality using a fast scan of the slit across the field of view with the aid of adaptive optics. We describe its design, specifics, and performance as well as data processing 相似文献
55.
Hyungmin Park Jongchul Chae Donguk Song Ram Ajor Maurya Heesu Yang Young-Deuk Park Bi-Ho Jang Jakyoung Nah Kyung-Suk Cho Yeon-Han Kim Kwangsu Ahn Wenda Cao Philip R. Goode 《Solar physics》2013,288(1):105-116
We observed solar prominences with the Fast Imaging Solar Spectrograph (FISS) at the Big Bear Solar Observatory on 30 June 2010 and 15 August 2011. To determine the temperature of the prominence material, we applied a nonlinear least-squares fitting of the radiative transfer model. From the Doppler broadening of the Hα and Ca ii lines, we determined the temperature and nonthermal velocity separately. The ranges of temperature and nonthermal velocity were 4000?–?20?000 K and 4?–?11 km?s?1. We also found that the temperature varied much from point to point within one prominence. 相似文献
56.
57.
Lee Seon-Sik Ahn Hyung-Jin Hwang In-Uk Kim Eun Han Kyung-Nam 《Ocean Science Journal》2021,56(4):406-412
Ocean Science Journal - Carcinogenic disinfection by-products (DBPs) are formed as the result of the chlorination of power plant water cooling systems for biofouling purposes. Effects of cooling... 相似文献
58.
西昆仑阿什库勒火山群位于青藏高原西北缘,由于环境恶劣,研究程度低。大黑山火山为该区内熔岩分布面积最广、喷发规模最大的一座火山。本次对大黑山火山岩的显微结构、斑晶类型和化学成分进行了详细的测试分析,讨论其反映的岩浆过程。大黑山火山成分具有一个较大的范围,包括玄武粗安岩、粗安岩和粗面岩,主要氧化物与Si O2含量之间呈线性关系,说明三种类型岩浆存在岩浆演化关系。熔岩主要斑晶为辉石和斜长石,大量斑晶显示熔蚀、反环带和反应边结构,指示岩浆混合特征。温压计计算得到玄武粗安岩和粗安岩平衡温度在1124~1176℃之间,平衡压力在0.55~0.81GPa之间,对应的深度约16.5~24.3km,粗面岩的平衡温度1059~1071℃,平衡压力0.39~0.59GPa,对应深度11.8~17.7km。研究显示,大黑山火山下的主岩浆经历了玄武粗安岩、粗安岩和粗面岩的演化,三种岩浆可能以分层的形式同时存在于岩浆房中,三种岩浆存在着混合作用,并与周围偏酸性岩浆发生了混合作用。 相似文献
59.
Influence of climate variation on seasonal precipitation in the Colorado River Basin 总被引:1,自引:1,他引:0
Tae-Woong Kim Chulsang Yoo Jae-Hyun Ahn 《Stochastic Environmental Research and Risk Assessment (SERRA)》2008,22(3):411-420
This study analyzed the influence of large-scale climate pattern on precipitation in the Colorado River Basin. Large-scale
climatic oscillations, like ENSO, PDO, NAO, and the global warming trend are associated with regional hydrologic variation.
Ten types of climate indices were gathered and analyzed to investigate their influence on seasonal precipitation variation
in the basin based on a linear correlation analysis and an influence index analysis. The influence index was developed in
this study to measure the effect of climate variation on the seasonal precipitation in the basin. The statistical evidence
achieved in this study confirms that the Colorado River Basin is subjected to the phase of climate variation. The strength
of the seasonal response of precipitation to the climate variation varies in different localities in the basin. The methods
of analysis used in this study were proposed in the hope that progress in understanding and modeling dynamic climatic systems
can result in developing a valuable long-term forecasting model for water resources management. 相似文献
60.
Recent progress in modeling ionospheric current systems requires global conductivity models which can reflect substorm conditions on an instantaneous basis. For this purpose, empirical relations of the North-South component (ΔH) of the magnetic disturbance field observed at College with the Pedersen (Σp) and Hall (ΣH) conductivities deduced from the Chatanika radar data and their ratio () are examined. These empirical formulas allow us to construct approximate distribution patterns of Σp and Σ>H over the entire polar region on the basis of the distribution of ΔH at given instants by devising an appropriate weighting function for both the polar cap and the subauroral region. The global conductivity distributions thus obtained are compared with those employed by Kamide et al. (1981) and Spiro et al. (1982). The comparisons show that the gross features are similar among them. In addition, we also examine the relationship of ΔH with the North-South component of the electric field with the particle energy injection rate (uA) estimated from the Chatanika radar data. Based on the empirical relation between ΣH and uA the global distribution of the latter over the entire polar region at particular instants can also be obtained. 相似文献