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991.
本区钙铬榴石含钙铝榴石分子,两者组成类质同像系列矿物,颜色和透明度随成分变化而变化。目前找到的钙铬榴石成翠绿色十分美丽。但是,透明者少,粒度均小于4mm,达不到宝石级标准。但埋于坡积层中的含钙铬榴石铬透辉石岩的转石风化强烈,钙铬榴石易于脱出,晶体保存完整,采选容易,是寻找宝石的理想地区。 相似文献
992.
南海到西太平洋地区水汽输送和山东夏季降水量奇异值分解分析 总被引:5,自引:4,他引:1
利用奇异值分解(SVD)方法和山东省26个代表站1951~2000年6~8月降水量、NCEP/NCAR再分析1958~1998年1~12月925~300hPa5层月平均比湿和风场资料,分析了山东夏季降水与前期(冬季、春季)及同期(夏季)南海到西太平洋地区水汽输送之间相关场的分布型,从中找出了遥相关的“关键区”,并对找到的“关键区”的可靠性进行了验证。研究表明,山东夏季降水与前期(冬季、春季)和同期(夏季)南海到西太平洋地区水汽输送相关较好,春季的相关程度最高,冬季次之,夏季最小。 相似文献
993.
Analysis of the influence of Taihu Lake and the urban heat islands on the local circulation in the Yangtze Delta 总被引:6,自引:0,他引:6
The influences of human activities on regional climate and weather are tremendous. The re-gional temperature and the distributing of wind field are influenced, whereas the precipitation in-tensity and the spatial and temporal distribution of the precipita… 相似文献
994.
Mafic granulite xenoliths have been discovered in many volcanoes (especially alkali basalt and kimberlite) all over the world. They formed generally in lower crust, and recorded lots of in- formation on the lithosphere formation and crust-mantle interacti… 相似文献
995.
Winter cyclone frequencies in thirteen models participating in the Atmospheric Model Intercomparison Project (AMIP1) 总被引:1,自引:0,他引:1
Various aspects of the simulated behaviour of cyclones in thirteen models participating in the AMIP1 exercise are presented. In the simulation of the winter climatological mean sea level pressure field for the Northern Hemisphere, the models produce reasonable simulations of the "semi-permanent" features of the climatology. The greatest departures from the observed climatology occur near the exit regions of the oceanic storm tracks; i.e., over northwestern North America, over and to the west of the British Isles and in the Mediterranean. The departures in the three geographical areas are very systematic in that at least eleven of the models exhibit similar departures from observations. In the Southern Hemisphere the intensity of the circumpolar trough is generally well simulated but positioned slightly too far north. Most models exhibit errors south of Africa, New Zealand, and South America. The simulations of the cyclone events show that the models are reasonably successful in reproducing the large-scale aspects of observed cyclone events but deficiencies in the details of the simulations are apparent. The paucity of simulated events to the south of the Alps and to the east of the Rockies suggests that the models have difficulty simulating lee cyclogenesis. Over much of North America, the models have difficulty simulating the correct level of synoptic activity as demonstrated by the low numbers of both cyclone events and anticyclone events. The models have difficulty simulating the distribution of cyclone events as a function of central pressure. The most common problem is that the models exhibit an ever increasing deficit of events with decreasing central pressure. This problem is more apparent in the Southern Hemisphere than in the Northern Hemisphere and does not appear to be resolution dependent. There is an apparent ENSO signal in the observed Northern Hemisphere interannual variability of intense winter cyclone events. With the exception of ECMWF, the models fail to reproduce this phenomenon. There is some evidence that the models do indeed respond to the interannual variability in the SSTs, but the response tends to be negatively correlated with that of the real atmosphere. In the Southern Hemisphere, there does not appear to be ENSO-induced interannual variability in the observed numbers of cyclone events. Consequently, it could be argued that the models have been reasonably successful in the Southern Hemisphere since they, like the observations, do not exhibit any ENSO-induced interannual variability. 相似文献
996.
近44 a中国冬夏气温变率及其对区域变暖性的影响 总被引:6,自引:2,他引:4
利用近44a中国85个测站冬夏季逐日平均、最高和最低气温序列,研究冬夏季温度季节变率及其时空演变特征,探讨其对区域变暖稳定性的影响。结果表明:冬季,除高原、西南、东北以外的中国大部分地区,温度的季节变率存在显著下降趋势,是近期变暖的稳定区,其中变暖最为稳定、显著的区域是西北、华北地区,东北北部虽变暖幅度很大,但稳定性最差;夏季,长江中下游及其江南地区温度变率存在显著上升趋势,20世纪70年代后年际变幅明显增大,表明该地区80年代降温的稳定性差。 相似文献
997.
998.
999.
Sinkhole collapse is one of the main limitations on the development of karst areas, especially where bedrock is covered by
unconsolidated material. Studies of sinkhole formation have shown that sinkholes are likely to develop in cutter (enlarged
joint) zones as a result of subterranean erosion by flowing groundwater. Because of the irregular distribution of pinnacles
and cutters on the bedrock surface, uncertainties arise when "hit-or-miss" borehole drilling is used to locate potential collapse
sites. A high-resolution geophysical technique capable of depicting the details of the bedrock surface is essential for guiding
the drilling program. Dipole-dipole electrical resistivity tomography (ERT) was used to map the bedrock surface at a site
in southern Indiana where limestone is covered by about 9 m of clayey soils. Forty-nine transects were conducted over an area
of approximately 42,037 m2. The electrode spacing was 3 m. The length of the transects varied from 81 to 249 m. The tomographs were interpreted with
the aid of soil borings. The repeatability of ERT was evaluated by comparing the rock surface elevations interpreted from
pairs of transects where they crossed each other. The average difference was 2.4 m, with a maximum of 10 m. The discrepancy
between interpreted bedrock-surface elevations for a transect intersection may be caused by variations in the subsurface geology
normal to the transect. Averaging the elevation data interpreted from different transects improved the ERT results. A bedrock
surface map was generated using only the averaged elevation data at the transect junctions. The accuracy of the map was further
evaluated using data from four exploratory boreholes. The average difference between interpreted and actual bedrock surface-elevations
was less than 0.4 m. The map shows two large troughs in the limestone surface: one coinciding with an existing sinkhole basin,
while the other is in alignment with a small topographic valley. Because sinkholes were observed at the same elevation interval
in similar valleys in the vicinity, the delineated trough may have implications for future land use at the site.
Received: 4 January 1999 · Accepted: 8 March 1999 相似文献
1000.
海南岛“邦溪—晨星蛇绿岩片”的时代及其构造意义—Sm—Nd同位素制约 总被引:25,自引:4,他引:21
本文报道了邦溪和晨星两个地区变质基性岩的 Sm - Nd同位素定年结果。Sm - Nd等时线年龄 333± 12 Ma代表了变质基性岩的形成年龄。这些变质基性岩高度亏损 Th、Nb、Ta和轻稀土元素 ,εNd(t)≈ 7,与洋中脊玄武岩类似 ,形成于大洋环境。本文将这些洋中脊型变质基性岩称之为“邦溪 -晨星蛇绿岩片”,它们与金沙江 -双沟 - Song Ma蛇绿岩在形成时代上基本一致 ,代表了东古特提斯洋的残片。邦溪 -晨星蛇绿岩片在早三叠世华南 (包括海南岛北部 )和印支块体 (包括海南岛中南部 )块体碰撞拼合时构造侵位在大陆上 ,成为“石碌混杂岩”的一部分 相似文献