全文获取类型
收费全文 | 1084篇 |
免费 | 158篇 |
国内免费 | 36篇 |
专业分类
测绘学 | 14篇 |
大气科学 | 114篇 |
地球物理 | 287篇 |
地质学 | 52篇 |
海洋学 | 14篇 |
天文学 | 744篇 |
综合类 | 6篇 |
自然地理 | 47篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 17篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 12篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 30篇 |
2012年 | 11篇 |
2011年 | 47篇 |
2010年 | 56篇 |
2009年 | 103篇 |
2008年 | 117篇 |
2007年 | 90篇 |
2006年 | 81篇 |
2005年 | 58篇 |
2004年 | 68篇 |
2003年 | 51篇 |
2002年 | 33篇 |
2001年 | 29篇 |
2000年 | 39篇 |
1999年 | 41篇 |
1998年 | 47篇 |
1997年 | 31篇 |
1996年 | 55篇 |
1995年 | 40篇 |
1994年 | 34篇 |
1993年 | 21篇 |
1992年 | 20篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 7篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有1278条查询结果,搜索用时 15 毫秒
971.
Two different equatorial quasi-biennial oscillation (QBO) indices, two reanalyses and radiosonde observations are used to analyze the Arctic stratospheric temperature and height. This analysis was used to assess the uncertainties in the connection of solar forcing, QBO and the Arctic variability. The results show that (1) the frequency of the westerly/easterly phases of the QBO over the stratospheric equator has a significant multiple peak seasonal variation. The primary seasonal peaks occur in February, March and April for the westerly phase of the QBO and the easterly phase peaks in June, July and August. (2) The correlation of stratospheric Arctic temperature and height with the solar radio flux shows statistical significance in February or July/August even if there is no stratified phase of QBO (easterly and westerly phases) involved. However, when the correlation was computed according to the stratified phase of QBO, the solar signals in both temperature and height fields are remarkably amplified in February and November under the westerly phase, but the signal in the height field is most significant only in August under the easterly phase. (3) The impact of the QBO and solar forcing on the stratospheric temperature and heights in the Arctic varies depending on the season. The impacts are also sensitive to the specific height of the QBO-defined level that is used, the specific period of the analysis and the dataset used. 相似文献
972.
1997年3月9日漠河日全食期间地磁脉动的主要特征 总被引:1,自引:0,他引:1
1997年3月9日漠河日全食期间分别在漠河地磁台,北京怀柔地磁脉动站和三亚地磁台开展了地磁脉动的观测。本文重点分析了3月9日07:00LT至11:00LT日全食前后漠河地区地磁脉动的观测资料,研究了日全食期间地磁脉动的主要特征,并对日全食期间地磁脉动的激发机制做了较深入的人。 相似文献
973.
本文统计了第22 太阳活动周期间(1991 ~1995 年) 发生的25 个太阳质子事件与太阳耀斑及日冕物质抛射(CME) 事件的关系 统计结果表明, 所有的太阳质子事件都与耀斑发生相关, 除2 个质子事件(19941020 和19951020 日发生的太阳质子事件) 与CME发生无关, 其余质子事件也都与CME 相关 值得注意的是, 与质子事件相关的耀斑有16 个是双带耀斑, 其中包括与CME无关的2 个事件的耀斑, 占总数的64 % 上述统计结果证实了无论是太阳耀斑, 还是物质抛射, 它们对太阳质子事件的发生同样起着非常重要的作用 相似文献
974.
Population of Daphnia carinata exposed to different times on the day showed sharp inhibition of reproduction (measured different life table data) on the day of solar eclipse as compared to pre- and post-eclipse days. Sudden fall of water temperature and abrupt change to darkness as prevailed during the solar eclipse were responsible for inhibition of reproduction in Daphnia carinata. Cold and dark induced reproductive inhibition was also confirmed in a simulated experiment mimicing eclipse reduction in light and temperature. 相似文献
975.
用120°E经度链附近台站电离层垂测资料和一个二维低纬电离层理论模式探讨1995年10月24日日食电离层效应.在日食条件下只考虑日食区计算太阳EUV辐射减少.模式结果显示:(1)日食期间较低高度电离层光食效应显著,电子浓度跟随食分迅速变化,在食甚后浓度减少达到最大。较高高度电离层对日食响应延迟.(2)低纬地区日食日f0.F2比控制日低,而hmF2比控制日高.在低纬度地区日食带来的影响相对较大·(3)赤道附近hmF2食甚后有一突变,出现日食F1.5层。(4)食甚后海口纬度附近F层受日食影响持久,而f0F2在赤道附近出现第2次下降.最后对低纬日食电离层效应的动力学因素进行了初步的讨论. 相似文献
976.
977.
978.
The eddy covariance technique and the cuvette method were used to investigate water use efficiency in an irrigated winter wheat (Triticum asetivum L.)/summer maize (Zea mays L.) rotation system in the North China Plain. The results show that ecosystem water use efficiency (WUEe) changed diurnally and seasonally. Daily maximal WUEe appeared in the morning. WUEe generally peaked in late April in wheat field and in late July/early August in maize field. From 2003 to 2006, seasonal mean WUEe was 6.7–7.4 mg CO2 g−1 H2O for wheat and 8.4–12.1 mg CO2 g−1 H2O for maize. WUEe was much lower than canopy water use efficiency (WUEc) under small leaf area index (LAI) but very close to WUEc under large LAI. With the increase in LAI, WUEe enlarged rapidly under low LAI but slowly when LAI was higher than one. WUEe was greater on the cloudy days than on the sunny days. Under the same solar radiation, WUEe was higher in the morning than in the afternoon. The ratio of internal to ambient CO2 partial pressure (Ci/Ca) decreased significantly with the increase in photosynthetically active radiation (PAR) when PAR was lower than the critical values (around 500 and 1000 μmol m−2 s−1 for wheat and maize, respectively). Beyond critical PAR, Ci/Ca was approximately constant at 0.69 for wheat and 0.42 for maize. Therefore, when LAI and solar radiation was large enough, WUEe has negative correlation with vapor pressure deficit in both of irrigated wheat and maize fields. 相似文献
979.
Wayan Suparta Zainol Abidin Abdul Rashid Mohd. Alauddin Mohd. Ali Baharudin Yatim Grahame J. Fraser 《Journal of Atmospheric and Solar》2008,70(11-12):1419-1447
Predicting global climate change is a great challenge and must be based on a thorough understanding of how the climate system components behave. Precipitable water vapor (PWV) is one of the key components in determining and predicting the global climate system. It is well known that the local surface temperature and pressure have a direct influence on the production of PWV. However, the influence of solar activity on atmospheric dynamics and their physical mechanisms is still an open debate, where past studies are focused at mid-latitude regions. A new method of determining and quantifying the solar influence on PWV based on GPS observations to correlate the GPS PWV and total electron content (TEC) variations is proposed. Observed data from Scott Base (SBA) and McMurdo (MCM) stations from 2003 to 2005 have been used to study the response of PWV to solar activity. In the analysis, the effects of local conditions (wind speed and relative humidity) on the distribution of PWV are investigated. Results show significant correlation between PWV and solar activity for four geomagnetic storms, with correlation coefficients of 0.74, 0.77, 0.64 and 0.69, which are all significant at the 95% confidence level. There was no significant correlation between TEC and PWV changes during the absence of storms. On a monthly analysis, a strong relationship exists between PWV and TEC during storm-affected days, with correlation coefficients of 0.83 and 0.89 (99% confidence level) for SBA and MCM respectively. These indicate a statistically significant seasonal signal in the Antarctic region, which is very active (higher) during the summer and inactive (lower) for the winter periods. 相似文献
980.
目前,我国大部分遥感传感器的大气层外波段平均太阳光谱辐照度(Mean solar exoatmospheric irradiances over band b,简称ESUNb)尚未公布,这给遥感图像表观反射率的计算带来了不便,在一定程度上影响了数据资料的应用和推广。本文基于已有官方ESUNb值的EO1/ALI、Terra/ASTER、QuickBird等多种中、高空间分辨率传感器,对9条常见的太阳光谱曲线进行比较分析。结果表明,WRC太阳光谱曲线最合适计算中分辨率传感器的ESUNb,而Wehrli太阳光谱曲线最合适计算高分辨率传感器的ESUNb。基于WRC太阳光谱曲线和Wehrli太阳光谱曲线计算,得到了ZY-1 02C/PMS相机、ZY-3/TLC相机和MUX相机,以及GF-1/WFV相机和PMS相机各波段ESUNb值,并对ESUNb值的不确定性进行了分析。结果显示,太阳光谱选取的不同,对ESUNb的取值会产生-1.94%至1.48%的偏差。本文使用多种卫星传感器交叉比较的方式确定了最佳的太阳光谱,给出了ZY-1 02C、ZY-3和GF-1等卫星搭载的遥感传感器各波段的ESUNb值,为这些国产卫星遥感数据的广泛应用提供便利。此外,本文所用方法简便易行,在其他新的遥感传感器上具有推广应用价值。 相似文献