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481.
诸暨璜山金矿是除治岭头以外浙江省第二金矿,它的找矿模式为"三高两低一复合"的找矿模式,即高金晕、高极化率、高磁场跳跃、低电阻率、低电位和北东断裂与北东东断裂复合处是成矿最有利部位.在其附近仍有类似成矿部位,有望扩大远景. 相似文献
482.
Nine Landsat TM tapes and images and MSS images, 10 NOAA tapes and images and 1 SAR image from 1973 to 1997 were used to analyse the diffusion of suspended sediments and the change of tidal radial sand ridges in the northern part of the Changjiang River delta, the South Yellow Sea. The results showed that the diffusion of suspended sediments was controlled by the tide, net current, and submarine topography in this area. The distribution of suspended sediments had close relationship with thesubmarine topography. The old Huanghe River delta and the Changjiang River comprise the main sediment supply for the formation of radial sand ridges, whose evolution can be divided into three stages since the Huangbe River changed its course and flowed northward into the Bohai Sea. 相似文献
483.
Remote sensing technique has played an important role in land use dynamic monitoring, but as for the land use dynamic monitoring
at county level, traditional remote sensing methods such as satellite imagery visual interpretation and computer classification
can not meet its demand for accuracy. The result of 1: 10 000 land use investigation map has high accuracy, but this method
can not be used to dynamically monitor the land use because of its big expenses, long period and difficulty in updating data.
In this paper, the characteristics of physiognomy, climate and the status of land use in Dehui County are taken into consideration
and a set of method, which takes use of 3S techniques and applies to Northeast China Plain, is come up with. When the land
use type of a land parcel changed as a whole, the date updating can be make by changing its land type ID in the attribute
table in a GIS. When the land use type of an irregular area changed, GPS receivers are used to position its border. This set
of method is characteristic of high accuracy and low expenses. It gets the information of land use change timely and can be
used to dynamically monitor the land use.
Foundation item: Under the auspices of the key project of the National Ninth Five-year Plan (96-B02-01-07).
Biography: LI Lin-yi (1968 —), female, a native of Jilin, Ph. D. candidate of Changchun Institute of Geography, the Chinese
Academy of Sciences. Her research interest includes land use change monitoring and crop yield estimation using “3S” techniques. 相似文献
484.
???????-????????????????????????е??г??????,????????????????????????;???,??????????????????????????С???????÷??????????Э???????????????????о??????????????????????仯???????????????????????????????y?????????????????????????Э?????????С???????÷???????????????????????Ч?????????? 相似文献
485.
??????????????????(VTEC)??????????????????????????????????4?????????????????????Э????????????????С???????÷????????????????????????г????????????????????????????????????????????????????????(CODE)????????????????????????0.812???????????ο???в???4 TECu????????????????????????????????????????????γ20°?????????????????????????????????????1??7 TECu?????????????????2.4 TECu?????CODE????????20.14%????????????????3.5 TECu?????CODE???????????????????3.0 TECu?????CODE????????8.25%?? 相似文献
486.
青狮潭暴雨气候特征统计分析 总被引:4,自引:2,他引:2
对1981~2006年3~8月份青狮潭水库各水文雨量站点重大降雨的时空分布,重大暴雨过程的主要影响系统的特征做了统计分析.结果表明:青狮潭暴雨、大暴雨的年际、月际分布很不均,90年代是暴雨高峰期,是80年代和21世纪以来的1.6倍左右.5~6月是暴雨过程集中期.从各月各站点的暴雨过程分布看,北部站点明显多于南部站点.暴雨雨带与湘桂走廊相近.低层系统以锋面最多,低空急流次之,第三为西南涡.通过分析,揭示了青狮潭降水基本气候特征和基本影响系统,对提高局地暴雨预报准确率、促进重大暴雨的预报服务工作和提高桂林城乡供水、农业灌溉、防洪、漓江旅游补水工程都有着重要意义. 相似文献
487.
488.
489.
490.
Outburst risk of barrier lakes in Sichuan,China 总被引:1,自引:1,他引:1
34 barrier lakes induced by earthquake have been formed by wedged debris on the river channels after a massive earthquake happening on May 12 in Sichuan, China. Among them, the Tangjiashan Barrier Lake is the largest one. It faces very urgent risk of dam breaking when water level reaches the top and begins overflow in case of storm rainfalls and continually aftershocks, threatening already devastated cities and villages with about 1.5 million people downstream. The outburst of a similar barrier lake occurred in the Minjiang River in 1933, causing a catastrophic flood. Risk analysis indicates that not all barrier lakes are highly dangerous. Only those lakes with very high dams and water to be filled up in short period need to be dealt with immediately. 相似文献