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   77382篇
  免费   13911篇
  国内免费   20769篇
测绘学   11443篇
大气科学   9319篇
地球物理   14040篇
地质学   47603篇
海洋学   11452篇
天文学   2253篇
综合类   6746篇
自然地理   9206篇
  2024年   389篇
  2023年   1246篇
  2022年   3297篇
  2021年   3934篇
  2020年   3242篇
  2019年   3933篇
  2018年   8183篇
  2017年   7304篇
  2016年   5728篇
  2015年   4110篇
  2014年   3811篇
  2013年   4621篇
  2012年   6055篇
  2011年   7828篇
  2010年   7073篇
  2009年   6951篇
  2008年   6679篇
  2007年   6869篇
  2006年   4339篇
  2005年   3872篇
  2004年   3199篇
  2003年   2293篇
  2002年   2133篇
  2001年   1757篇
  2000年   1468篇
  1999年   634篇
  1998年   230篇
  1997年   117篇
  1996年   92篇
  1995年   59篇
  1994年   49篇
  1993年   46篇
  1992年   59篇
  1991年   27篇
  1990年   56篇
  1989年   16篇
  1987年   19篇
  1986年   26篇
  1985年   24篇
  1984年   29篇
  1983年   18篇
  1982年   13篇
  1981年   32篇
  1980年   22篇
  1979年   24篇
  1978年   10篇
  1976年   14篇
  1957年   19篇
  1954年   30篇
  1933年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
1IN T R O D U C T IO NAn image isa setofbelief,s ideasand impressionsthatapersonholdsaboutan object(KOTLER,1991).Similar-lydefinitionistheimage of a destinationas thesum ofbelief,sideasand impressionsthatpeoplehave ofa placeor destination(CROMPTON,1979;KO…  相似文献   
52.
This study on the distribution features of petroleum hydrocarbon in water and sedi-ment off the Fujian shore using data obtained from the baseline research on oceanic contamination in Fujian showed that:during the research preiod,petroleum hydrocarbon concentrations in water varied from 5.77μg/L to 37.28μg/L,averaged 14.48 μg/L;was lower in the wet seasson than in the dry season;and was highest in the Minjiang Estuary and Jiulong Estuary in both seasons ,The petorleum hydrocarbon concentrations in shore sediment varied from 14.48 mg/kg to 784.36 mg/kg,averaged 133.3 mg/kg ,and was closely related to sediment types (granularity).  相似文献   
53.
The main reasons for the high content of inorganic N and its increase by several times in the Changjiang River and its mouth during the last 40 years were analysed in this work. The inorganic N in precipitation in the Changjiang River catchment mainly comes from gaseous loss of fertilizer N, N resulting from the increases of population and livestock, and from high temperature combustions of fossil fuels. N from precipitation is the first N source in the Changjiang River water and the only direct cause of high content of inorganic N in the Changjiang River and its mouth. The lost N in gaseous form and from agriculture non-point sources fertilizer comprised about 60% of annual consumption of fertilizer N in the Changjiang River catchment and were key factors controlling the high content of inorganic N in the Changjiang River mouth. The fate of the N in precipitation and other N sources in the Changjiang River catchment are also discussed in this paper.  相似文献   
54.
The Nilgiri Mountains of south India is considered unique by anthropologists, geologists, climatologists, botanists as well as tourists. It has remained a subject of constant study and research over the last two centuries. Man-nature balance had continued undisturbed in the Nilgiris for thousands of years until the early 19th century when it became a British colony attracting, in due course, various developmental activities. Subsequently, the Nilgiris and its popular hill stations emerged as favourite places for the British population in India for rest and recuperation, game and for raising commercial plantations. In the process, the traditional indigenous crops were replaced by “English“ vegetables and the natural forests gave way to commercial plantations of coffee, tea and other exotic species of trees.  相似文献   
55.
对20颗依巴谷(Hipparcos)卫星所观测的碳星作了近红外JHK测光,由近红外观测结果估算了其在K波段的热改正BCK和视热星等mbpl以及有效温度Te,结合依巴谷卫星所得视差,得到其中一些星的绝对热星等Mbol。  相似文献   
56.
Development and Extension of Seawater Desalination by Reverse Osmosis   总被引:2,自引:0,他引:2  
Seawater desalination has been people‘s fond dream since ancient times,the dream is now becoming a reality.This paper presents a brief development history of reverse osmosis.Much attention was paid to innovative development in mebranes,modules.equipments and applied technology,including asymmetric and composite membranes,spiral-wound element and hollow fiber module,energy recovery equipments and different technological processes.The extension of reverse osmosis,such as desalination,pre-concentration,integrated processes and nanofiltration,is also briefly mentioned.  相似文献   
57.
58.
Blazar 的X射线谱性质   总被引:1,自引:0,他引:1  
从Donato文献中选择了一个含有69个Blazar的样本,样本中每个源有多个X射线辐射流量数据,用该样本研究了流量密度和谱指数之间的关系,以及研究了三类源(HBL,LBL,FSRQ)的红移和谱指数的分布。结果表明:对于HBLs,谱指数和流量密度之间有一个较好的反相关关系存在,而对于LBLs和FSRQs却没有相关。因此认为HBL的X射线是同步辐射所致,而LBL和FSRQ的X射线辐射较为复杂可能是同步自康普顿过程导致。HBL显示软X射线谱,而FSRQ显示硬X射线谱,LBL居中。在谱图中HBL位于近端,rSRQ位于远端,LBL居中。  相似文献   
59.
INTRODUCTIONTheSubeiShoalandtheChangjiangRiverestuarineareainthewestoftheHuanghaiandEastChinaSeasisoneofthemarginalseasintheworld ,wheresuspendedmatterisextremelyhigh .Here ,notonlyistheretheTaiwanWarmCurrentoneoftheKuroshio’sbranchesintheEastChinaSea,butalsotheHuanghaiCoastalCurrent,andChangjiangDilutedWater.Sothestrongmixingbetweenthecoastalandoffshorewaterscomplicatessuspendedmatterdistributioninthisarea.HowthesuspendedmatterdischargedfromtheChangjiangRiverandtheabandonedHuan…  相似文献   
60.
The Changjiang River (Yangtze) is one of the fastest growth areas of container transportation in Chi-na. Rail, road and water transportation have competed against each other for container transportation in the Chang-jiang River main line and its delta area. It is of significance to assess these different transportation modes scientifi-cally in order to organize container transportation efficiently in this area and make decision for integral plan and construction of transportation system in this area. This paper outlines application of fuzzy comprehensive evaluation to appraise different modes of typical direction of containers. Twelve assessment indexes were decided. Membership functions were formulated. Evaluation results indicated that road transportation was optimal mode in the Changjiang River delta area, however water transportation was the primary way in the Changjiang River main line.  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