全文获取类型
收费全文 | 6737篇 |
免费 | 1240篇 |
国内免费 | 1582篇 |
专业分类
测绘学 | 366篇 |
大气科学 | 1400篇 |
地球物理 | 1753篇 |
地质学 | 3204篇 |
海洋学 | 994篇 |
天文学 | 223篇 |
综合类 | 835篇 |
自然地理 | 784篇 |
出版年
2024年 | 23篇 |
2023年 | 108篇 |
2022年 | 309篇 |
2021年 | 344篇 |
2020年 | 320篇 |
2019年 | 290篇 |
2018年 | 355篇 |
2017年 | 347篇 |
2016年 | 408篇 |
2015年 | 298篇 |
2014年 | 390篇 |
2013年 | 363篇 |
2012年 | 339篇 |
2011年 | 367篇 |
2010年 | 412篇 |
2009年 | 367篇 |
2008年 | 316篇 |
2007年 | 326篇 |
2006年 | 278篇 |
2005年 | 220篇 |
2004年 | 193篇 |
2003年 | 210篇 |
2002年 | 200篇 |
2001年 | 184篇 |
2000年 | 207篇 |
1999年 | 311篇 |
1998年 | 291篇 |
1997年 | 276篇 |
1996年 | 229篇 |
1995年 | 240篇 |
1994年 | 211篇 |
1993年 | 170篇 |
1992年 | 151篇 |
1991年 | 93篇 |
1990年 | 91篇 |
1989年 | 72篇 |
1988年 | 50篇 |
1987年 | 37篇 |
1986年 | 22篇 |
1985年 | 26篇 |
1984年 | 25篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 17篇 |
1980年 | 12篇 |
1979年 | 12篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1958年 | 4篇 |
排序方式: 共有9559条查询结果,搜索用时 0 毫秒
951.
Ji Wu Guang-Wu Zhu Hua Zhao Chi Wang Lei Li Yue-Qiang Sun Wei Guo Cheng-Li Huang 《Chinese Astronomy and Astrophysics》2010
Compared with other planets, Mars is a planet most similar with the earth and most possible to find the extraterrestrial life on it, and therefore especially concerned about by human beings. In recent years, some countries have launched Mars probes and announced their manned Mars exploration programs. China has become the fifth country in the world to launch independently artificial satellites, and the third country able to carry out an independent manned space program. However, China is just at the beginning of deep space explorations. In 2007, China and Russia signed an agreement on a joint Mars exploration program by sending a Chinese micro-satellite Yinghuo-1 (YH-1) to the Mars orbit. Once YH-1 enters its orbit, it will carry out its own exploration, as well as the joint exploration with the Russian Phobos-Grunt probe. This paper summarizes the scientific background and objectives of YH-1 and describes briefly its payloads for realizing these scientific objectives. In addition, the main exploration tasks of YH-1 and a preliminary prospect on its exploration results are also given. 相似文献
952.
The problem of ore-bearing potentiality of the strata involves metallogenic theory and ore-search orientation. Studies of
the spatial distribution of endogenic Au-Ag polymetallic ore deposits in North Hebei indicated that the strata in which ore
deposits occurred range in age from Paleozoic, Proterozoic to Mesozoic. In addition the ore deposits are characterized as
being strata-bound in nature. The arise and establishment of “extracting” viewpoint may be attributed to the following three
reasons: 1) influence by the idea of “ore-source bed”; 2) limitation of analytical techniques in the 1980s’ (especially gold
element); and 3) a small number of samples (sampling locations were mostly disturbed by mineralization). Studies have shown
that ore-forming materials would most probably come from the deep interior of the Earth. Deep-seated ore-bearing materials
including Au-Ag polymetals were brought to the shallow levels by way of mantle plume-mantle sub-plume-mantle branch structure
multi-stage evolution, finally leading to the formation of ore deposits. 相似文献
953.
954.
Up to now,there were no systematic studies of geochemistry and isotopic age for the Yixian(义县) fluorite deposit,western Liaoning(辽宁) Province,China.Based on the analysis of metallogenic geological setting,we studied the REE,Rb-Sr and Sm-Nd isotopes.The chondrite-normalized REE patterns of fluorite are characterized by moderate LREE depletion(LREE/HREE=0.95-3.57,(La/Yb)N=0.08-2.84) and enrichment of Sr(146×10-6-596×10-6) and moderately positive Eu anomalies(δEu=1.10-1.34),which are similar to those of the ho... 相似文献
955.
Xuefei Liu Qingfei Wang Jun Deng Qizuan Zhang Silei Sun Jianyin Meng 《Journal of Geochemical Exploration》2010
The Dajia Salento-type bauxite deposit in western Guangxi is hosted within the Quaternary ferrallitic soil profile, and it formed via breaking up, weathering and oxidizing of Permian bauxite orebodies occurring as a semi-continuous layer in the upper Permian. Mineralogical analyses reveal that diaspore, hematite and kaolinite are the major minerals in bauxite ores with small amounts of anatase, chamosite, gibbsite, goethite, illite, zircon, quartz and pyrite. The ore texture and mineral assemblage reveal that the depositional/diagenetic environment of the Dajia bauxite was much close to phreatic environment. Both the ore texture and the morphology of zircon grains also indicate that most of the bauxitic soils were transported a short distance. Diaspore is suggested to be non-metamorphic in origin and mainly formed in a reducing condition of diagenetic environment, while kaolinite is the product of the in situ epigenetic replacement of alumina in diaspore by dissolved silica. Geochemical analyses indicate that Al2O3, Fe2O3, SiO2 and TiO2 are the main components of the bauxite ores and trace elements such as Zr, Hf, Nb, Ta, Th and U were enriched during the bauxitization process. Simultaneously, Zr vs. Hf and Nb vs. Ta show a high correlation. Geochemical indices such as Zr/Hf, Nb/Ta and Eu/Eu* (among others) denote that the magmatic rocks related to the Emeishan plume in western Guangxi and the carbonates in the underlying Maokou Formation provided the main sources of material for the bauxite ores. 相似文献
956.
介绍了岩石边坡的形成和特征以及岩石边坡生态防护的内涵,系统总结了目前常用的4类岩石边坡生态护坡方法,并对其进行了对比,指出了当前生态护坡技术的发展趋势和需要解决的关键问题. 相似文献
957.
958.
959.
镇江雷暴气候特征及天气学预报方法分析 总被引:2,自引:0,他引:2
雷暴是严重的气象灾害之一,给人民生命财产带来严重影响。雷暴的发生发展地域性强,因此加强镇江本地雷暴特征的研究和预警工作十分必要。利用镇江市1959--2010年的雷暴气候资料,通过气候倾向率、小波分析等统计方法,对其周期性、时空分布特征及年(代)际、季节变化特征等进行了分析,得出以下结论:1)镇江市雷暴呈现出市区少、周边地区多的特点,其中句容雷暴发生频率最多且持续时间长。2)镇江市平均雷暴日数存在4a、6a、10~12a左右、准20a的长周期振荡信号。从长周期分析,镇江市近几年的年平均雷暴日数处于偏多周期时段。3)年平均雷暴日数距平,20世纪60年代、70年代、21世纪的00年代是正距平,特别是2006--2010年连续5a的平均雷暴日数都大于气候值,是雷暴频发时期;80年代、90年代为负距平。1963年的雷暴日数最多,有53.3天;1979年的最少,为15天。通过对1999--2008年镇江市地面观测资料的194个雷暴天气过程个例进行统计分析,对影响镇江市的雷暴天气系统进行了分型,在此基础上提出了预报镇江市雷暴天气的思路,为开展雷暴预报预警业务提供理论依据。 相似文献
960.
随着微创手术的发展,虚拟手术的应用前景越来越广阔.力反馈作为虚拟手术的核心技术,其实现的效果直接影响了虚拟手术的沉浸感.通过对经典包围盒碰撞检测算法进行研究比对,选择了球包围盒的碰撞检测算法,并建立了精确的反馈力计算模型,实现了介入血管中的柔性碰撞仿真.该仿真具有很高的实时性和精度. 相似文献