全文获取类型
收费全文 | 2065篇 |
免费 | 272篇 |
国内免费 | 523篇 |
专业分类
测绘学 | 153篇 |
大气科学 | 342篇 |
地球物理 | 404篇 |
地质学 | 1187篇 |
海洋学 | 212篇 |
天文学 | 56篇 |
综合类 | 355篇 |
自然地理 | 151篇 |
出版年
2024年 | 5篇 |
2023年 | 25篇 |
2022年 | 60篇 |
2021年 | 65篇 |
2020年 | 44篇 |
2019年 | 60篇 |
2018年 | 61篇 |
2017年 | 67篇 |
2016年 | 69篇 |
2015年 | 67篇 |
2014年 | 67篇 |
2013年 | 93篇 |
2012年 | 62篇 |
2011年 | 205篇 |
2010年 | 131篇 |
2009年 | 159篇 |
2008年 | 126篇 |
2007年 | 147篇 |
2006年 | 146篇 |
2005年 | 108篇 |
2004年 | 128篇 |
2003年 | 192篇 |
2002年 | 85篇 |
2001年 | 64篇 |
2000年 | 41篇 |
1999年 | 89篇 |
1998年 | 74篇 |
1997年 | 64篇 |
1996年 | 42篇 |
1995年 | 43篇 |
1994年 | 37篇 |
1993年 | 46篇 |
1992年 | 36篇 |
1991年 | 21篇 |
1990年 | 22篇 |
1989年 | 41篇 |
1988年 | 9篇 |
1987年 | 11篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1970年 | 1篇 |
1954年 | 1篇 |
1937年 | 1篇 |
排序方式: 共有2860条查询结果,搜索用时 687 毫秒
291.
292.
2007年淮河强降水时期低频环流特征 总被引:2,自引:1,他引:1
利用NCEP/NCAR再分析资料以及中国气象台站降水资料,研究了2007年夏季淮河流域强降水的低频振荡及其环流特征。结果表明,2007年夏季淮河流域强降水低频振荡的主要周期是10 25天。淮河流域降水强弱与对应低频周期存在联系,降水主要发生在低频周期的正位相时期,而在负位相时期结束或明显减弱。降水的低频变化一方面与副热带高压和南亚高压的低频变化有关,另一方面还受到中高纬度冷空气低频变化的影响。在低频周期的峰值位相,对流层高层出现的低频反气旋使南亚高压偏东,脊线偏北,并有利于西太平洋副热带高压向更西、更北的方向发展,整个对流层垂直方向上有低频的上升运动。中高纬地区出现大片正位势涡度,冷空气的低频活动显著偏强,南下侵入到中国淮河流域的冷空气较多,形成有利于淮河流域强降水的环流场。相反,在低频周期的谷值位相,对流层高层出现的低频气旋使南亚高压偏西,脊线偏南,不利于西太平洋副热带高压向更西、更北的方向发展,整个对流层垂直方向上有低频的下沉运动。高纬度冷空气的低频活动偏弱,南下侵入到中国淮河流域的冷空气也较少,最终形成不利于淮河流域强降水的环流场。 相似文献
293.
2007年淮河流域暴雨期间大气环流特征分析 总被引:6,自引:3,他引:3
利用NCAR/NCEP再分析资料及国家气象信息中心30年气候平均降水资料,通过动力诊断与分析手段研究了2007年6—7月发生在我国淮河流域的暴雨。结果表明,淮河流域的环流垂直结构和降水有着非常好的对应关系。暴雨期间,鄂霍茨克海阻高与乌拉尔山阻高这种双阻高形势对于淮河流域的持续降水提供了很好的条件;南亚高压高层(200 hPa)基本为正散度区,低层(850 hPa)为负散度区,上下层强烈的抽吸结构对暴雨的发生也是非常有利的条件,同时,在淮河暴雨期问,南亚高压(200 hPa)与500 hPa西太平洋副热带高压有着相向而行的移动路径;位涡对于分析冷空气的活动,有着比较清晰的意义,暴雨发生前,有明显的正位涡异常从高纬度向低纬度伸展。大气非绝热加热分析结果显示,视热源和视水汽汇两者的高值中心与相应时段暴雨中心位置一致。 相似文献
294.
295.
296.
297.
298.
Liang Zhang Songhe Geng Linchao Yang Ronghua Wen Chuan He Zhen Zhao Guangxiong Qin 《地学前缘(英文版)》2022,(1):310-325
The blockage induced by particle migration and deposition is one of the main reasons for the decrease of reinjection capacity in the porous geothermal reservoir with a low and medium temperature.In this paper,a new drilled geothermal well in Xining basin China is taken as an example to investigate the formation blockage risk due to the movable clay and sand particles in pores.The physical properties of the reservoir rocks were analyzed,a series of pumping and reinjection tests were conducted,and the longterm reinjection performance of the well was predicted by numerical simulation based on the test fitting.The results show that the geothermal reservoir rocks are argillaceous and weakly cemented sandstones with a content of movable clay and sand particles up to 0.18–23.42 wt.%.The well presented a high productivity of 935–2186 m3?d-1 at a pressure difference of 0.7–1.62 MPa in the pumping tests associated with a large amount of clay and sand particles produced out,while in the reinjection test,only a low injectivity of 240–480 m3?d-1 was observed at an injection pressure of 0.2–0.6 MPa with the clay and sand particles near the wellbore move into deep.According to the prediction,under conditions of a blockage risk,the injectivity of the well will start to decline after 100 days of injection,and in the third year,it will decrease by 59.00%–77.09%.The influence of invasion of pretreated suspended particles and scale particles can be neglected.Under conditions of a high blockage risk,the injectivity of the well will decrease significantly in the first 20–30 days,with a decline of 75.39%–78.96%.Generally,the higher the injection pressure or rate,the greater the decrease in injectivity of the well caused by particle blockage.Pump lifting is an effective measure to remove the well blockage which can be used regularly. 相似文献
299.
Giant Mineral Deposits and Their Geodynamic Setting in the Lanping Basin, Yunnan, China 总被引:6,自引:0,他引:6
XUE Chunji LIU Shuwen CHEN Yuchuan ZENG Rong ZHAO Shihua College of Earth Sciences Resources Chang''an University Xi''an Shaanxi Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》2004,78(2):368-374
There are giant mineral deposits, including the Jinding Zn-Pb and Baiyangping Ag-Co-Cu, and otherimportant mineral deposits (e.g., Baiyangchang Ag-Cu, Jinman Cu deposits, etc.) in the Lanping Mesozoic-Cenozoic Basin, Yunnan Province, China. The tabular ore-bodies and some veins hosted in terrestrial clastic rocks of the Mesozoic-Cenozoic age and no outcropping of igneous rocks in the giant deposits lead to the proposal of syngenetic origin, but the giant mineral deposits are not stratabound (e.g. MVT, sandstone- and Sedex-type). They formed in a continental red basin with intense crust movement. The mineralization is controlled by structures and lithology and occurs in different strata, and no sedimentary nature and no exhalative sediments are identified in the deposits. The deposits show some relations with organic matter (now asphalt and petroleum) and evaporates (gypsum). The middle-low-temperature (mainly 110℃ to 280℃) mineralization took place at a depth of about 0.9 km to 3.1 km during the early 相似文献
300.
SUN Aiqun NIU Shuyin SHAO Ji''an HOU Quanlin ZHANG Jianzhen Shijiazhuang College of Economics Shijiazhuang Hebei School of Earth Space Sciences Peking University Beijing Institute of Geology Geophysics Chinese Academy of Sciences Beijing 《《地质学报》英文版》2004,78(1):283-290
The basin-and-range area in eastern North China is known for frequent occurrence of earthquakes, their great magnitudes and heavy losses thereby incurred. Seismic studies in the past usually emphasized the intersections, inflexions and branches of the faults. However, the intensities of many great earthquakes in this area do not show linear distribution, and the epicenters are horizontally dispersed at certain depths instead of along the strike of faults. Based on the sub-mantle plume studies made by authors in the past decade, it is thought that there exists an uplifted sub-mantle plume under the fault depression area in North China. The uplifting and intrusion of mantle materials caused the upper crust to be faulted, while low-velocity and high-velocity layers are alternatively distributed in the middle crust under the influence of the mantle and the lower crust. The middle and lower crust materials were detached from the top of the sub-mantle plume to the surroundings while the sub-mantle plume materi 相似文献