全文获取类型
收费全文 | 547篇 |
免费 | 26篇 |
国内免费 | 17篇 |
专业分类
测绘学 | 24篇 |
大气科学 | 54篇 |
地球物理 | 134篇 |
地质学 | 154篇 |
海洋学 | 150篇 |
天文学 | 48篇 |
综合类 | 15篇 |
自然地理 | 11篇 |
出版年
2023年 | 1篇 |
2022年 | 6篇 |
2021年 | 12篇 |
2020年 | 7篇 |
2019年 | 11篇 |
2018年 | 26篇 |
2017年 | 23篇 |
2016年 | 47篇 |
2015年 | 22篇 |
2014年 | 35篇 |
2013年 | 57篇 |
2012年 | 19篇 |
2011年 | 39篇 |
2010年 | 37篇 |
2009年 | 35篇 |
2008年 | 24篇 |
2007年 | 26篇 |
2006年 | 32篇 |
2005年 | 23篇 |
2004年 | 25篇 |
2003年 | 18篇 |
2002年 | 8篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 7篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
排序方式: 共有590条查询结果,搜索用时 31 毫秒
71.
D. Schwan F. Bertoldi S. Cho M. Dobbs R. Guesten N. W. Halverson W. L. Holzapfel E. Kreysa T. M. Lanting A. T. Lee M. Lueker J. Mehl K. Menten D. Muders M. Myers T. Plagge A. Raccanelli P. Schilke P. L. Richards H. Spieler M. White 《New Astronomy Reviews》2003,47(11-12):933
The APEX-SZ experiment is a sky survey designed to discover galaxy clusters via the Sunyaev–Zel’dovich effect at millimeter wavelengths. We describe the components of the instrument, including the 12 m Atacama Pathfinder Experiment telescope, optics, Transition-edge sensor bolometer array and SQUID readout. APEX-SZ will begin observations in 2004. 相似文献
72.
Tsanyao?Frank?YangEmail author Gao-Hua?Yeh Ching-Chou?Fu Cheng-Chen?Wang Te-Fang?Lan Hsiao-Fen?Lee Cheng-Hong?Chen Vivek?Walia Quo-Cheng?Sung 《Environmental Geology》2004,46(8):1003-1011
Many mud volcanoes are distributed along the tectonic sutures in southern Taiwan and can be divided into five zones based on their relative positions in different tectonic domains. Most active mud volcanoes are exhaling methane-dominated gases. Nevertheless, some gases show unusual carbon dioxide-dominated and/or nitrogen-excess compositions. This implies that there are multiple sources for the gas compositions of mud volcanoes in Taiwan.For better understanding the total amount of exhalation gases and its flux, the gas flow and compositions were continuously measured in the interval of two minutes at Chung-lun (CL) bubbling mud pool for a few months. The major compositions of gases exhaling from this site were 75~90% of CO2 and 5~12% of CH4. The amount of gases exhaling from the mud pool can be estimated to be about 1.4 ton/year for CH4 and 28 ton/year for CO2, respectively. The preliminary results of exhaling gas flux from the major vents of representative active mud volcanoes, yielded an estimated total CH4 output of the mud volcanoes in Taiwan of ca. 29 ton/year during quiescent period. 相似文献
73.
Statistical relationship between two types of El Niño events and climate variation over the Korean Peninsula 总被引:3,自引:0,他引:3
Jong-Seong Kug Min-Seop Ahn Mi-Kyung Sung Sang-Wook Yeh Hong-Sik Min Young-Ho Kim 《Asia-Pacific Journal of Atmospheric Sciences》2010,46(4):467-474
Recently, a new type of El Niño (Warm-Pool El Niño) is more often observed than the conventional El Niño (Cold-Tongue El Niño); each has a distinctive spatial pattern. The two types of El Niño have different teleconnections; therefore their impacts on a specific region can be considerably different. In this study, we focus on statistical relationship between climate variation in Korea and the two types of El Niño. When the two types of El Niño are not separately considered, the statistical relation between climate variables in Korea and the El Niño events is weak in general. When the two types of El Niño are separately considered, however, each type exhibits significant relationship with climate variation in Korea. Therefore, consideration of two types of El Niño separately can potentially improve climate prediction over the Korean Peninsula. 相似文献
74.
The objective of this study is to improve the statistical modeling for the ternary forecast of heavy snowfall in the Honam area in Korea. The ternary forecast of heavy snowfall consists of one of three values, 0 for less than 50 mm, 1 for an advisory (50–150 mm), and 2 for a warning (more than 150 mm). For our study, the observed daily snow amounts and the numerical model outputs for 45 synoptic factors at 17 stations in the Honam area during 5 years (2001 to 2005) are used as observations and potential pre... 相似文献
75.
J. Schneider A. Boccaletti D. Mawet P. Baudoz J.-L. Beuzit R. Doyon M. Marley D. Stam G. Tinetti W. Traub J. Trauger A. Aylward J. Y-K. Cho C.-U. Keller S. Udry 《Experimental Astronomy》2009,23(1):357-377
The Super-Earth Explorer is an Off-Axis Space Telescope (SEE-COAST) designed for high contrast imaging. Its scientific objective is to make the physico-chemical characterization of exoplanets possibly down to 2 Earth radii. For that purpose it will analyze the spectral and polarimetric properties of the parent starlight reflected by the planets, in the wavelength range 400–1,250 nm. 相似文献
76.
The thermal conductivities of granite were measured under different conditions of porosity and water content to investigate the effects of the porosity and water content on the thermal conductivity. For the dry samples, the thermal conductivities range from 2.12 W/mK for the rocks with a high porosity to 3.12 W/mK for the ones with a low porosity. Water-sorbed samples have greater thermal conductivities than dry samples of the same granite. The thermal conductivities range from 2.99 W/mK for granites with a high porosity to 3.62 W/mK for ones with a low porosity under saturated condition. 相似文献
77.
Abstract— We present results from a model of oxygen isotopic anomaly production through selective photodissociation of CO within the collapsing proto‐solar cloud. Our model produces a proto‐Sun with a wide range of Δ17O values depending on the intensity of the ultraviolet radiation field. Dramatically different results from two recent solar wind oxygen isotope measurements indicate that a variety of compositions remain possible for the solar oxygen isotope composition. However, constrained by other measurements from comets and meteorites, our models imply the birth of the Sun in a stellar cluster with an enhanced radiation field and are therefore consistent with a supernova source for 60Fe in meteorites. 相似文献
78.
Ocean Science Journal - Age and growth of southern bluefin tuna (SBT, Thunnus maccoyii) were estimated based on otoliths collected by Korean tuna longline vessels in the Atlantic and Indian Oceans... 相似文献
79.
80.
Seoleun Shin Jeon-Ho Kang Hyoung-Wook Chun Sihye Lee Kwangjae Sung Kyoungmi Cho Youngsoon Jo Jung-Eun Kim In-Hyuk Kwon Sujeong Lim Ji-Sun Kang 《Asia-Pacific Journal of Atmospheric Sciences》2018,54(1):351-360
An ensemble data assimilation system using the 4-dimensional Local Ensemble Transform Kalman Filter is implemented to a global non-hydrostatic Numerical Weather Prediction model on the cubed-sphere. The ensemble data assimilation system is coupled to the Korea Institute of Atmospheric Prediction Systems Package for Observation Processing, for real observation data from diverse resources, including satellites. For computational efficiency in a parallel computing environment, we employ some advanced software engineering techniques in the handling of a large number of files. The ensemble data assimilation system is tested in a semi-operational mode, and its performance is verified using the Integrated Forecast System analysis from the European Centre for Medium-Range Weather Forecasts. It is found that the system can be stabilized effectively by additive inflation to account for sampling errors, especially when radiance satellite data are additionally used. 相似文献