全文获取类型
收费全文 | 2941篇 |
免费 | 515篇 |
国内免费 | 706篇 |
专业分类
测绘学 | 587篇 |
大气科学 | 278篇 |
地球物理 | 932篇 |
地质学 | 1587篇 |
海洋学 | 247篇 |
天文学 | 85篇 |
综合类 | 248篇 |
自然地理 | 198篇 |
出版年
2024年 | 20篇 |
2023年 | 41篇 |
2022年 | 75篇 |
2021年 | 99篇 |
2020年 | 94篇 |
2019年 | 134篇 |
2018年 | 120篇 |
2017年 | 122篇 |
2016年 | 136篇 |
2015年 | 161篇 |
2014年 | 175篇 |
2013年 | 152篇 |
2012年 | 201篇 |
2011年 | 215篇 |
2010年 | 191篇 |
2009年 | 176篇 |
2008年 | 180篇 |
2007年 | 186篇 |
2006年 | 204篇 |
2005年 | 157篇 |
2004年 | 142篇 |
2003年 | 107篇 |
2002年 | 126篇 |
2001年 | 89篇 |
2000年 | 117篇 |
1999年 | 105篇 |
1998年 | 72篇 |
1997年 | 69篇 |
1996年 | 67篇 |
1995年 | 65篇 |
1994年 | 71篇 |
1993年 | 60篇 |
1992年 | 58篇 |
1991年 | 40篇 |
1990年 | 30篇 |
1989年 | 19篇 |
1988年 | 26篇 |
1987年 | 28篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有4162条查询结果,搜索用时 15 毫秒
251.
新疆构造运动期序及特征 总被引:6,自引:2,他引:6
新疆地域辽阔,地质构造运动复杂,特征各异。前人曾对新疆构造运动的划分及命名做了大量工作,但多有不一致,有些构造运动的划分或命名依据不足,因此失去了应有的代表性。现根据实际资料,对新疆地质构造运动重新归纳和认识,提出新疆境内构造运动可划分为11期32幕(次),其中前寒武纪6期、古生代2期17幕(次),中新生代3期9幕(次) 相似文献
252.
豫西南矽线石物相分析方法研究 总被引:2,自引:2,他引:2
以豫西南地区4个矿区的矿物组合为依据,建立了铝量法测定矽线石含量的物相分析方法。对比了不同方法制备的矽线石及其不同存在条件下溶解率的差异,确定了接近矿区实际的、准确合理的分析结果校正办法。 相似文献
253.
IntroductionAfteramoderateorstronger(Ms25.0)earthquake,themosturgentworkofthedivisionforearthquakemonitoringandpredictionistodetermineitstimeoforigin,hypocentrallocation(longitude,latitudeanddepth)andmagnitudeandtojudgethetrendofseismicregimedevelopmentassoonaspossible.Ingeneralcases,whenanearthquakewithMS25.0insideChinaoraonewithMS26.0inneighboringareasofChinahasoccurred,theEarthquakeBulletinofChineseSeismologicalNetworkcanprovidedeterminationoftheorigintime,hypocentrallocation(longitude,… 相似文献
254.
An advanced method of automated seismic phase picking and exact location and magnitude determination of swarm micro-earthquakes from local network data is presented. The phase picker is applied in two steps: first, S-wave groups are identified using a polarisation detector, and then corresponding P-wave groups are searched for. The times of maximum P- and S-amplitudes are then used as starting points for the determination of accurate P- and S-arrival times. The maximum S-wave amplitudes are utilised for determining local magnitudes. The whole procedure is checked by simultaneous preliminary hypocentre location providing estimates of local magnitudes and a compatibility check of the candidate P- and S-phases. The closest station to the earthquake cluster is used as a master, and the phase search at the remaining stations is governed by the P- and S-phases identified at the master station. Thanks to the use of apriori information on the approximate position of hypocentres, the procedure is also capable of picking the individual P- and S-phases of sequences of overlapping swarm events. The performance of the procedure was tested by comparison of the automatically and interactively created catalogues of the January 1997 NW-Bohemia micro-earthquake swarm. With stations located at epicentral distances between 0 and 20 km, the difference between hypocentre coordinates obtained by automatic and interactive processing did not exceed 80 m for 86% events. All events above magnitude 0.5 were identified, and the automatically determined polarity of first P-wave motion proved to be correct in 89% of them. 相似文献
255.
F. Freistetter 《Celestial Mechanics and Dynamical Astronomy》2000,78(1-4):211-225
The correlation dimension D
2 is used to develop a method of classification for phase space orbits. D
2 depends only on the mutual distances of the orbits points, therefore the time development of the orbit is reflected in the time development of the correlation dimension approximants. It is shown, that this technique allows to investigate the dynamical properties of a phase space orbit, a classification of chaotic and regular orbits and a detection of sticky orbits. 相似文献
256.
塔里木盆地北部隆起牙哈断裂带负反转过程与油气聚集 总被引:19,自引:0,他引:19
采用地层厚度分析、“零点”分析、位移 /距离曲线分析和断层生长指数分析等方法,讨论了牙哈负反转断裂带的几何学和运动学特征、主反转期及控油作用,结果表明牙哈主断裂主反转期为早白垩世,负反转活动结束于中新世康村期-上新世库车期。牙 1号断裂主反转期为中新世苏维依期,牙 2号断裂主反转期为晚白垩世-老第三纪,二者都于中新世康村期结束反转活动。牙哈断裂带油气聚集和分布与断裂的负反转活动有关。 相似文献
257.
Using a 40-yr daily precipitation dataset including 134 stations from 1962 to 2001, the large-scale distribution patterns of precipitation anomalies over East China are investigated in the present paper. In the phase space spanned by the first 8 EOFs generated from the 20-day low-pass filtered data, the six rainfall regimes (RRs) are identified by applying a cluster analysis method, namely, the northeastern China regime, Yellow River regime, Qinling Mountain-Huaihe River regime, Yangtze River with its south regime, South China regime, and rainless regime. Analyses show that the new RRs exhibit good persistence and evident physical sense, and excellently represent both of countrywide and regional features, which also demonstrate the inhomogeneity of multi-dimensional phase space. Furthermore, it is more important that the new RRs can describe intraseasonal dynamic characteristics of large-scale rainfall anomalies, which is the most significant difference between the new RRs and the conventional seasonal mean rainfall patterns. On the other hand, the climatic characteristics of daily distributions of the RRs events, as well as the 40-year panorama of the RRs occurring are also investigated, which further document rationality and objectivity of the RRs with intraseasonal variability, and are likely to present more helpful information for short-term climate prediction, compared with other previous classical rainfall patterns. 相似文献
258.
Introduction Scattering of incident waves by local topographies is one of the most attractive topics in the field of engineering seismology. They can be resolved by either a numerical method or an analyti-cal method. The numerical methods include finite difference method, finite element method, boundary element method, etc. The analytical method is the wave function expansion method. Al-though numerical methods can be used for arbitrary-shaped topographies, the analytical solutions are still … 相似文献
259.
260.