全文获取类型
收费全文 | 9871篇 |
免费 | 2012篇 |
国内免费 | 2744篇 |
专业分类
测绘学 | 1245篇 |
大气科学 | 1762篇 |
地球物理 | 2154篇 |
地质学 | 5333篇 |
海洋学 | 1557篇 |
天文学 | 438篇 |
综合类 | 884篇 |
自然地理 | 1254篇 |
出版年
2024年 | 115篇 |
2023年 | 246篇 |
2022年 | 667篇 |
2021年 | 737篇 |
2020年 | 604篇 |
2019年 | 710篇 |
2018年 | 693篇 |
2017年 | 613篇 |
2016年 | 670篇 |
2015年 | 635篇 |
2014年 | 679篇 |
2013年 | 728篇 |
2012年 | 762篇 |
2011年 | 664篇 |
2010年 | 660篇 |
2009年 | 566篇 |
2008年 | 591篇 |
2007年 | 513篇 |
2006年 | 432篇 |
2005年 | 374篇 |
2004年 | 312篇 |
2003年 | 273篇 |
2002年 | 343篇 |
2001年 | 314篇 |
2000年 | 222篇 |
1999年 | 256篇 |
1998年 | 177篇 |
1997年 | 164篇 |
1996年 | 149篇 |
1995年 | 132篇 |
1994年 | 102篇 |
1993年 | 102篇 |
1992年 | 94篇 |
1991年 | 60篇 |
1990年 | 46篇 |
1989年 | 54篇 |
1988年 | 43篇 |
1987年 | 21篇 |
1986年 | 23篇 |
1985年 | 20篇 |
1984年 | 12篇 |
1983年 | 7篇 |
1982年 | 6篇 |
1981年 | 9篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1958年 | 5篇 |
1954年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
581.
The ecological environment in the East China Sea (ECS) and the Yellow Sea (YS) has changed significantly due to sea-level rising and the Kuroshio incursion since the last deglaciation. In this study, biomarker records of core F10B from the mud area southwest off Cheju Island (MSWCI) were generated to evaluate phytoplankton productivity and community structure changes in response to environmental evolution during the last 14 kyr. The contents of diatom, dinoflagellate and haptophyte biomarkers (brassicasterol, dinosterol and C37 alkenones) display similar trends, with increasing phytoplankton productivity during the last 14 kyr due to the increased influences of the Kuroshio, and especially due to the eddy-induced upwelling during the late Holocene. On the other hand, the contents of terrestrial biomarkers (C28 +C30 +C32 n-alkanols) and terrestrial organic matter (TOM) proxies (TMBR’ and BIT) all reveal decreasing TOM input into the area around the sampling site for the 14 kyr, mostly due to sea-level rising. Phytoplankton biomarker ratios reveal a shift from a haptophyte-dominated community at 6.2–2.5 kyr BP to a diatom-dominated community at 2.5–1.45 kyr BP, likely caused by a stronger cold eddy circulation system at 2.5–1.45 kyr BP in the MSWCI. 相似文献
582.
In practical seismic exploration, internal multiples generated when the wave impedance of medium is strong, and seismic records are recorded. The method of virtual event repress internal multiples is to move scattered points from underground to the surface, similar to the method of the surface-related multiple elimination (SRME). The method of SRME belongs to the prediction-subtraction approaches to eliminate internal multiples, prediction method is based on building a brand new way of seismic wave propagation (virtual reflection and virtual event), so that it has forward and backward wave propagation, and through convolution with significant wave to predict the internal multiples. Due to required data needing field information of full-wave, the authors use Seislet transform interpolating the missing data to ensure the premise of internal multiples prediction. The test data show that the above method has achieved good results. 相似文献
583.
??2008?????????????????InSAR??MAI????????????????????λ????α???????????InSAR+AZI?????1????Multi-LOS?????2?????????????????????????α?????????????????????????????????????????£???????????1???????????????????2??????????档 相似文献
584.
抽水和建筑荷载双重作用下的地面沉降模型 总被引:1,自引:0,他引:1
依据含水层质量守恒原理,推导了非固结地层在建筑荷载作用下的地面沉降机理模型,并将其与Jacob假定下抽水引起的地面沉降弹性模型相比较,结果发现两种模型的机理表达式完全一致,仅区别于水动力原因或实质的不同.在同一坐标系中,根据线性叠加原理,抽水沉降漏斗和荷载沉降漏斗可能都落在地下水位降落漏斗内.假定两者为相互独立事件,给出了抽水和建筑荷载双重作用下的地面沉降模型,表明其如果以水位降深为制约因子,则可以对水动力实质完全不同的两种沉降过程进行线性叠加计算. 相似文献
585.
????2002-10-2007-09??Envisat??????????????佻???????????仯??????У???????????????????о???????±??????????????仯????????????????????????????????????6 cm/a?? 相似文献
586.
587.
Hongyan Geng Min Sun Chao Yuan Wenjiao Xiao Weisheng Xian Guochun Zhao Lifei Zhang Kenny Wong Fuyuan Wu 《Chemical Geology》2009,266(3-4):373-398
Voluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO2 = 50.4–63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg# = 0.39–0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu/Eu = 0.80) and pronounced negative Nb–Ta anomalies. Their Sr–Nd and zircon Hf isotopic compositions ((87Sr/86Sr)i = 0.7035–0.7042, εNd(t) = 4.5–7.9, εHf(t) = 14.1–14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO2 = 60.0–65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu/Eu = 0.75) but pronounced negative Nb–Ta anomalies. Sr–Nd and zircon Hf isotopic compositions ((87Sr/86Sr)i = 0.7037–0.7039, εNd(t) = 5.2–8.0, εHf(t) = 13.9–14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO2 = 70.0–78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb–Ta anomalies (average Eu/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr–Nd and zircon Hf isotopic compositions ((87Sr/86Sr)i = 0.7024–0.7045, εNd(t) = 5.1–8.9, εHf(t) = 13.7–14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma.A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the “slab window” opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. 相似文献
588.
����GPS�������е�������Ŀ������о� 总被引:5,自引:3,他引:5
?????????12??GPS???????????????????????????GPS???????????????????????????????????GPS?????????????б???????????????3mm?????????????????????????仯????????????????????????? 相似文献
589.
This paper attempts to analyze in detail the remote influence of the Indian Ocean Basin warming on the Northwest Pacific (NWP) during the year of decaying E1 Nifio. Observation data and the Fast Ocean- Atmosphere coupled Model 1.5 were used to investigate the triggering conditions under which the remote influence is formed between the positive sea surface temperature (SST) anomaly in the North Indian Ocean and the Anomalous Northwest Pacific anticyclone (ANWPA). Our research show that it is only when there is a contributory background wind field over the Indian Ocean, i,e., when the Indian Summer Monsoon (ISM) reaches its peak, that the warmer SST anomaly in the North Indian Ocean incites significant easterly wind anomalies in the lower atmosphere of the Indo-West tropical Pacific. This then produces the remote influence on the ANWPA. Therefore, the SST anomaly in the North Indian Ocean might interfere with the prediction of the East Asia Summer Monsoon in the year of decaying E1 Nifio. Both the sustaining effect of local negative SST anomalies in the NWP, and the remote effect of positive SST anomalies in the North Indian Ocean on the ANWPA, should be considered in further research. 相似文献
590.
基于加权Voronoi图的北京市湿地功能分区研究 总被引:1,自引:0,他引:1
湿地功能分区是城市湿地生态系统健康恢复、管理改善,以及资源可持续利用的重要前提。本文以北京湿地为例,利用客观赋权的主成分分析法对湿地生态服务功能进行综合评价;并结合空间分析中的Voronoi图空间分区方法,通过利用牛顿-断裂点模型确定属性权重的主要步骤,构建基于加权Voronoi图的城市湿地功能分区模型,开展"自下而上"定量化的北京湿地功能分区研究。结果表明:(1)北京湿地功能综合评价中,密云水库湿地的功能综合值最大,表明该湿地生态服务功能作用最重要。(2)北京湿地功能分区分为三级框架,其中包括4个一级核心湿地功能区、15个二级核心湿地功能区、43个三级核心湿地单元。(3)湿地资源功能价值量与湿地斑块空间关系的相结合,实现了属性和空间双重距离约束的湿地功能分区,促进了湿地生态系统服务价值评估在决策管理中的深入应用,为城市湿地功能区划提供技术支持。 相似文献