首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8519篇
  免费   1434篇
  国内免费   2058篇
测绘学   485篇
大气科学   2003篇
地球物理   2137篇
地质学   4288篇
海洋学   936篇
天文学   394篇
综合类   826篇
自然地理   942篇
  2024年   34篇
  2023年   175篇
  2022年   386篇
  2021年   437篇
  2020年   363篇
  2019年   354篇
  2018年   471篇
  2017年   430篇
  2016年   484篇
  2015年   376篇
  2014年   487篇
  2013年   482篇
  2012年   373篇
  2011年   405篇
  2010年   441篇
  2009年   438篇
  2008年   428篇
  2007年   387篇
  2006年   349篇
  2005年   312篇
  2004年   221篇
  2003年   269篇
  2002年   271篇
  2001年   229篇
  2000年   296篇
  1999年   420篇
  1998年   385篇
  1997年   393篇
  1996年   350篇
  1995年   283篇
  1994年   260篇
  1993年   195篇
  1992年   168篇
  1991年   128篇
  1990年   85篇
  1989年   102篇
  1988年   84篇
  1987年   58篇
  1986年   44篇
  1985年   37篇
  1984年   21篇
  1983年   26篇
  1982年   10篇
  1981年   14篇
  1980年   21篇
  1979年   10篇
  1978年   5篇
  1977年   4篇
  1958年   9篇
  1954年   1篇
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
961.
Zhou  W. D.  Xie  S. Y.  Bao  Z. Y.  Carranza  E. J. M.  Wang  Y.  Tang  M. L. 《Mathematical Geosciences》2022,54(1):131-150
Mathematical Geosciences - Inorganic pore structures are critical to understand the oil and gas transport and storage properties of unconventional reservoirs. However, it can be difficult to...  相似文献   
962.
本文根据1971-1998年福建台网地震资料,分析了台湾海峡南部与台湾东部区城中、强地震活动在时、空、强方面分布的相关性。  相似文献   
963.
964.
In a coastal zone an understanding of the distance of the fresh water–salt water interface and its extension inland is important for prevention of sea water intrusion. In this article estimating methods are described for calculating the distance of a fresh water–salt water interface in a coastal confined aquifer based on the submarine fresh groundwater discharge. This groundwater discharge is controlled not only by the aquifer properties and hydraulic head difference, but also by the position of the fresh water–salt water interface in the coastal zone. A homogeneous and isotropic coastal confined aquifer is considered and fresh groundwater flow in the confined aquifer is thought to be at a steady state. Two observation wells at different distances in a profile perpendicular to the coastline are required in calculation of the distance of the interface toe in the coastal zone. Four coastal confined aquifers with horizontal and sloping confining beds and with varying thickness are also considered. Reasonable results are obtained when examples are used to illustrate the application of the methods. The methods require hydraulic head data at the two wells and thickness of the confined aquifers, but the hydraulic conductivity and fresh groundwater flow rate of the confined aquifers are not needed.  相似文献   
965.
966.
The range of observed chemical compositions of natural terrestrial waters varies greatly especially when compared to the essentially constant global composition of the oceans.The concentrations of the REEs in natural terrestrial waters also exhibit more variation than what was reported in seawater,In terrestrial waters ,pH values span the range from acid up to alkaline,In addition,terrestrial waters can range from very dilute waters through to highly concentrated brines.The REE concentrations and their behavior in natural terrestrial waters reflect these compositional ranges,Chemical weathering of rocks represents the source of the REEs to natural terrestrial waters and ,consequently,the REE signature of rocks can impart their REE signature to associated waters,In addition,Because of the typical low solubilities of the REEs both surface and solution complexation can be important in fractionating REEs in aqueous solution.Both of these processes are important in all natural terrestrial waters,however,their relative importance varies as a function of the overall solution composition,In alkaline waters,for example,Solution complexation of the REEs with carbonate ions appears to control their aqueous distributions whereas in acid waters,the REE signature of the labile fraction of the REEs is readily leached from the rocks.In circumneutral pH waters,both processes appear to be important and their relative significance has not yet been determined.  相似文献   
967.
 Paleocollapse structure is a rock collapse, resulting from the failure in the geological history of the bedrock overlying karstified limestone. Depending on the present hydrogeological conditions within the area of paleocollapse and the internal properties of these structures, they can provide a means to facilitate groundwater flow and contaminant transport. Inactive paleocollapse structures can be reactivated by human activities such as dam construction, mining underground minerals, pumping groundwater, and development of landfills. They can also be reactivated by natural events such as earthquakes and neotectonic movements. In the mines of northern China, sudden inflow of karst water from Ordovician limestone into drifts and mining stopes through paleocollapse structures has caused significant economic loss. Water pumping tests and accompanied dye traces are effective approaches of locating water-conducting paleocollapse structures. Grouting is probably the best means of preventing them from becoming geohazards. Received: 26 November 1996 · Accepted: 17 June 1997  相似文献   
968.
张洪  周甄龙 《铀矿地质》1999,15(6):367-371
通过对华东地区21 个铀矿区内居民居住环境大气中氡及其子体α潜能浓度的调查,结果表明:居民居室外氡浓度均值范围为6.73—132.9 Bq/m 3,氡子体α潜能浓度均值范围为11.0—78.8nJ/m 3。居室内的平均氡浓度均值范围为14.5—185.8 Bq/m 3,氡子体α潜能浓度均值范围为13.8—104.2 nJ/m 3;对居民饮用水源的取样分析表明,铀浓度均值范围为0.12—1.68 μg/L,钍浓度均值范围为0.02—0.42 μg/L,镭-226 浓度均值范围为0.90—12.1 m Bq/L,与全国和当地的放射性天然本底水平比较接近,均属正常本底水平。  相似文献   
969.
The sequence architecture and depositional systems of the Paleogene lacustrine rift succession in the Huanghekou Sag, Bohai Bay Basin, NE China were investigated based on seismic profiles, combined with well log and core data. Four second‐order or composite sequences and seven third‐order sequences were identified. The depositional systems identified in the basin include: fan delta, braid delta, meander fluvial delta, lacustrine and sublacustrine fan. Identification of the slope break was conducted combining the interpretation of faults of each sequence and the identification of syndepositional faults, based on the subdivision of sequence stratigraphy and analysis of depositional systems. Multiple geomorphologic units were recognized in the Paleogene of the Huanghekou Sag including faults, flexures, depositional slope break belts, ditch‐valleys and sub‐uplifts in the central sag. Using genetic division principles and taking into consideration tectonic features of the Paleogene of the Huanghekou Sag, the study area was divided into the Northern Steep Slope/Fault Slope Break System, the Southern Gentle Slope Break System and T10 Tectonic Slope Break System/T10 Tectonic Belt. Responses of slope break systems to deposition–erosion are shown as: (1) basin marginal slope break is the boundary of the eroded area and provenance area; (2) ditch‐valley formed by different kinds of slope break belts is a good transport bypass for source materials; (3) shape of the slope break belt of the slope break system controls sediments types; (4) the ditch‐valley and sub‐sag of a slope break system is an unloading area for sediments; and (5) due to their different origins, association characteristics and developing patterns, the Paleogene slope break belt systems in the Huanghekou Sag show different controls on depositional systems. The Northern Fault Slope Break system controls the deposition of a fan delta‐lacustrine‐subaqueous fan, the Southern Gentle Slope Break system controls the deposition of a fluvial–deltaic–shallow lacustrine and sublacustrine fan, and the T10 Tectonic Slope Break System controls the deposition of shallow lacustrine beach bar sandbodies. The existence of a slope break system is a necessary but not a sufficient condition for studying sandbody development. The formation of effective sandbodies along the slope break depends on the reasonable coupling of effective provenance, necessary association patterns of slope break belt, adequate unloading space and creation of definite accommodation space. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   
970.
A major mission of geosciences is to characterize the composition, structure and geodynamic history of the earth’s continental interiors. Because the evidence for such studies is spread over dif-ferent disciplines and in different spatial and temporal scales, advances in understanding the  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号