全文获取类型
收费全文 | 3592篇 |
免费 | 1203篇 |
国内免费 | 1871篇 |
专业分类
测绘学 | 52篇 |
大气科学 | 3882篇 |
地球物理 | 614篇 |
地质学 | 971篇 |
海洋学 | 162篇 |
天文学 | 11篇 |
综合类 | 156篇 |
自然地理 | 818篇 |
出版年
2024年 | 69篇 |
2023年 | 125篇 |
2022年 | 205篇 |
2021年 | 247篇 |
2020年 | 247篇 |
2019年 | 328篇 |
2018年 | 222篇 |
2017年 | 266篇 |
2016年 | 219篇 |
2015年 | 275篇 |
2014年 | 360篇 |
2013年 | 419篇 |
2012年 | 368篇 |
2011年 | 351篇 |
2010年 | 250篇 |
2009年 | 294篇 |
2008年 | 263篇 |
2007年 | 352篇 |
2006年 | 297篇 |
2005年 | 247篇 |
2004年 | 185篇 |
2003年 | 188篇 |
2002年 | 128篇 |
2001年 | 126篇 |
2000年 | 132篇 |
1999年 | 78篇 |
1998年 | 74篇 |
1997年 | 64篇 |
1996年 | 55篇 |
1995年 | 58篇 |
1994年 | 49篇 |
1993年 | 26篇 |
1992年 | 22篇 |
1991年 | 22篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 14篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1980年 | 3篇 |
排序方式: 共有6666条查询结果,搜索用时 562 毫秒
311.
Relationships between δ18O in summer precipitation and temperature and moisture trajectories at Muztagata, western China 总被引:1,自引:0,他引:1
Based on summer observations of stable isotope of precipitation at Muztagata, western China, during 2002―2003, this paper presents the relationship between δ18O in precipitation and air temperature, and discusses the effect of moisture transport on δ18O in precipitation. Results show that air temperature correlates positively with δ18O in precipitation, and the temperature effect controls the δ18O of precipitation in this area. The Muztagata region exhibits high δ18O values in summer precipitation, similar to those shown at stations in adjacent regions. According to the results of our model set up to trace the moisture trajectories, the westerlies and local moisture circulation contribute to variations of oxygen isotopes in precipitation. In addition, the impacts of the moisture transport distance, the moisture transport level, and the incursion of the polar air mass also influence the variations of δ18O in precipitation. The moisture origins and transport mechanisms also contribute to the variation of δ18O in precipitation at Muztagata. 相似文献
312.
本文分析了部分地震学指标的物理意义。通过对华东地区1970年以来14个指标的全时间扫描,并使用华东地区Ms≥5.0地震进行对应,结果表明,选取Rm值、b值和AC值进行同步异常分析,能显著提高华东地区的有震报震率,但有漏报。对目前华东地区异常集中区(南黄海及其沿岸地区)进行时间扫描,结果显示该异常集中区未出现同步异常,认为该区域短期内发生中强地震的可能性不大。 相似文献
313.
本站剖面图资料与前汛期降水的探讨 总被引:1,自引:0,他引:1
通过统计分析1991~2005年剖面图资料,发现某些气象要素的特殊变化、一些图形的出现或转换与前汛期降水关系密切,特别是对大雨以上降水预报有一定的帮助作用。 相似文献
314.
Local flash flood storms with a rapid hydrological response are a real challenge for quantitative precipitation forecasting (QPF). It is relevant to assess space domains, to which the QPF approaches are applicable. In this paper an attempt is made to evaluate the forecasting capability of a high-resolution numerical weather prediction (NWP) model by means of area-related QPF verification. The results presented concern two local convective events, which occurred in the Czech Republic (CR) on 13 and 15 July 2002 and caused local flash floods. We used the LM COSMO model (Lokall Model of the COSMO consortium) adapted to the horizontal resolution of 2.8 km over a model domain covering the CR. The 18 h forecast of convective precipitation was verified by using radar rainfall totals adjusted to the measured rain gauge data. The grid point-related root mean square error (RMSE) value was calculated over a square around the grid point under the assumption that rainfall values were randomly distributed within the square. The forecast accuracy was characterized by the mean RMSE over the whole verification domain. We attempt to show a dependence of both the RMSE field and the mean RMSE on the square size. The importance of a suitable merger between the radar and rain gauge datasets is demonstrated by a comparison between the verification results obtained with and without the gauge adjustment. The application of verification procedure demonstrates uncertainties in the precipitation forecasts. The model was integrated with initial conditions shifted by 0.5° distances. The four verifications, corresponding to the shifts in the four directions, show differences in the resulting QPF, which depend on the size of verification area and on the direction of the shift. 相似文献
315.
Isotope Method for Confined Groundwater Recharge of the Lower Reaches of the Heihe River, Inner Mongolia, China
下载免费PDF全文
![点击此处可从《《地质学报》英文版》网站下载免费的PDF全文](/ch/ext_images/free.gif)
CHEN Jiansheng ZHAO Xia FAN Zhechao WANG Jiyang 《《地质学报》英文版》2007,81(4):668-673
Environmental isotopes have been applied to analyze confined groundwater recharge in the lower reaches of the Heihe River,Inner Mongolia.CFC is regarded as a tracer that determines the date of groundwater,the date being less than 45 a.The confined groundwater within the Gurinai area and Ejin Basin other than the surface water of Heihe River might have originated from precipitation from Qilian Mountain or/and the Tibetan Plateau.The deep confined groundwater overflows into an upper aquifer and emerges into the ground,forming springs and lakes within the low-lying area.The recharge volume is estimated to be around 400 million-cubic meters. 相似文献
316.
317.
318.
S. L. HWANG T. F. YUI H. T. CHU P. SHEN H. P. SCHERTL R. Y. ZHANG J. G. LIOU 《Journal of Metamorphic Geology》2007,25(3):349-362
Although oriented rutile needles in garnet have been reported from several ultrahigh‐pressure (UHP) rocks and considered to be important UHP indicators, their crystallographic features including growth habit and lattice correspondences with garnet host have never been properly characterized. This paper presents a detailed analytical electron microscopic (AEM) study on evenly distributed oriented rutile needles in garnet of two eclogitic rocks from Sulu. Some garnet in one UHP diamondiferous quartzofeldspathic rock from the Saxonian Erzgebirge, and in one high‐pressure (HP) felsic granulite from Bohemia also contain a few unevenly distributed oriented rutile needles. They have also been studied for the purpose of comparison. Despite different distribution patterns, AEM revealed that all rutile needles are oriented along the 〈111〉 directions of garnet with their lateral sides surrounded by the {110} planes of garnet, and that the growth directions of most needles are close to the normal of the {101} planes of rutile. No other specific crystallographic orientation relationships between rutile and garnet host were observed, and there is no pyroxene associated with rutile, as necessitated by the precipitation reaction of rutile in garnet as previously proposed. A simple solid‐state precipitation scenario for the formation of the rutile needles in garnet in these two eclogitic rocks is not justified. Three alternative mechanisms are considered for the formation of oriented rutile needles: (i) the rutile needles may be inherited from precursor minerals; (ii) the rutile needles may be formed by a dissolution–reprecipitation mechanism; and (iii) the rutile needles may be formed by cleaving and healing of garnet with rutile deposition. None of these mechanisms can fully explain the observations, although the first one is less likely and the third one is preferred. This study presents an example where the presence of oriented/aligned inclusions in minerals does not necessarily imply a precipitation origin. 相似文献
319.
320.