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   2723篇
  免费   577篇
  国内免费   786篇
测绘学   371篇
大气科学   513篇
地球物理   555篇
地质学   1551篇
海洋学   334篇
天文学   74篇
综合类   239篇
自然地理   449篇
  2024年   51篇
  2023年   110篇
  2022年   246篇
  2021年   270篇
  2020年   202篇
  2019年   275篇
  2018年   217篇
  2017年   210篇
  2016年   195篇
  2015年   183篇
  2014年   204篇
  2013年   204篇
  2012年   187篇
  2011年   156篇
  2010年   149篇
  2009年   141篇
  2008年   117篇
  2007年   130篇
  2006年   133篇
  2005年   102篇
  2004年   70篇
  2003年   77篇
  2002年   94篇
  2001年   58篇
  2000年   53篇
  1999年   62篇
  1998年   27篇
  1997年   21篇
  1996年   29篇
  1995年   23篇
  1994年   30篇
  1993年   12篇
  1992年   10篇
  1991年   4篇
  1990年   9篇
  1989年   6篇
  1988年   4篇
  1987年   4篇
  1986年   1篇
  1985年   2篇
  1984年   4篇
  1983年   1篇
  1979年   1篇
  1975年   1篇
  1954年   1篇
排序方式: 共有4086条查询结果,搜索用时 10 毫秒
51.
东海陆架区地热研究   总被引:3,自引:2,他引:3  
通过对东海陆架八口石油钻井岩岩芯采样,测定其热导率,并求取对应的地温梯度,据傅立叶定律计算单井的热流密度,在56-88.60mW/m^2之间,填补了东海陆架热流值测定的空白。  相似文献   
52.
 The null distribution of the lag-k sample serial correlation coefficient (r k , k=1,2,3) was investigated by Monte Carlo simulation. For a time series with normal, exponential, Pearson 3, EV1 (Gumbel), or generalized Pareto (GP) distribution type, the null distribution of its r k can be approximated by the normal distribution with mean −1/(nk) and variance 1/(n−1). But for a time series with the lognormal, EV2 or EV3 (Weibull) distribution type, the null distribution of r k is skewed distributed. In such cases, a simulation technique is suggested to construct percentile confidence intervals at a given significance level.  相似文献   
53.
首次报道了一种拼合处理的软玉及其鉴定特征。通过常规宝石学测试、红外光谱和X荧光能谱分析,对该类样品进行了鉴定。结果显示,从外观上,样品的"皮"与主体结合处的颜色分界截然,有明显的粘结痕迹和大量的蜡与气泡;拼合面两侧区域的红外光谱完全不一样;X荧光能谱显示,其"皮"较主体部分缺少Ca峰。根据测试结果认为,样品应为染色岫玉软玉拼合石。  相似文献   
54.
Ascertaining the relationship between "source-sink" landscape and non-point source(NPS) pollution is crucial for reducing NPS pollution, however, it is not easy to realize this target on cell unit scale. To reveal the relationships between "sourcesink" landscape and NPS pollution based on cell units of a small catchment in the Three Gorges Reservoir Region(TGRR), the runoff and nutrient yields were simulated first by rainfall events on a cell unit scale based on the Annualized AGricultural Non-Point Source Pollution Model(AnnAGNPS). Landscape structure and pattern were quantified with "sourcesink" landscape indicators based on cell units including landscape area indices and locationweighted landscape indices. The results showed that:the study case of small Wangjiagou catchment highlighted a good prediction capability of runoff and nutrient export by the AnnAGNPS model. Throughout the catchment, the spatial distribution trends of four location-weighted landscape indices were similar to the trends of simulated total nitrogen(TN) and total phosphorus(TP), which highlighted the importance of spatial arrangement of "source" and "sink" landscape types in a catchment when estimating pollutant loads. Results by Pearson correlation analysis indicated that the location-weighted landscape index provided a more comprehensive account of multiple factors, and can better reflect NPS-related nutrient loss than other landscape indices applied in single-factor analysis. This study provides new findings for applying the "source-sink" landscape indices based on cell units in small catchments to explain the effect of "source-sink" landscape on nutrient export based on cell unit, and helps improve the understanding of the correlation between "source-sink" landscape and NPS pollution.  相似文献   
55.
Lanzhou is a typical mountainous city with severe air pollution in northwestern China. This study uses hourly observational data of air pollutants at five air quality monitoring sites in Lanzhou from July to December 2015 to discuss data quality control and the representativeness of the monitoring sites(four urban sites and one suburban site). A fuzzy matrix is applied to study primary air pollutants. The results show that of the six routinely monitored pollutants,the primary pollutant is PM_10 during the study period. Based on lag correlation analysis and one-way analysis of variance, it is concluded that there are redundant observations at the four urban sites for the timely diffusion and transport of air pollutants from the same general area. The coefficient of divergence(COD) method is then used to evaluate the spatial distribution differences, and the primary air pollutant PM_10 shows differences at each site. COD can be used as a positive indicator to describe site representativeness. To evaluate the overall air pollution in the valley, correlation analysis is performed between the PM_10 concentration retrieved from aerosol optical depth satellite data and the concentration from the four urban monitoring sites. Among these, the correlation between the workers' hospital site data and the retrieval data is the highest, passing the 90% confidence level. A new representative evaluation model for air quality monitoring sites, R_s = 0.77 COD + 0.23R_(retrieval), is established by using COD and correlation coefficients between routine observations and satellite retrieval products. From this model, it can be concluded that the biological products institute site in Lanzhou is the most representative site for the evaluation of air pollution out of the four urban air quality monitoring sites from July to December 2015.  相似文献   
56.
对于羌塘盆地是否存在横贯东西的中央隆起带,目前学术界仍有分歧.本文提供的最新高精度航空重、磁资料证实存在呈东西向贯通羌塘盆地的中央隆起带,并对该带的构造特征进行了精细刻画.隆起带受南北两侧深大断裂控制,其空间跨度(宽度)由西向东逐渐收敛,并被一组近南北向的隐伏断裂系切割、左滑错动.重、磁场资料还显示中央隆起带在双湖东、西两侧存在明显差异:西段基底大规模隆起,基岩深度一般在3~5 km以内,明显浅于南北羌塘坳陷7~15 km的基底埋深;东段基底隆起幅度明显降低,主要表现为潜伏的低隆起,其中双湖—雅曲段基底埋深5~7 km,雅曲—岗尼段基底埋深7~9 km;即中央隆起带基底自西向东"台阶状"降低,隆起的幅度和分布范围受到近南北向断裂控制.构造分层表明,与南羌塘地块相比,北羌塘地块的基底隆起幅度小、稳定性更好.南北羌塘基底地球物理属性的显著差异说明羌塘盆地并不存在统一的前寒武系变质基底,中央隆起带的形成应该与古特提斯洋关闭时形成的混杂岩带有关.  相似文献   
57.
毛悦  孙付平 《海洋测绘》2006,26(2):69-72
对伪卫星实际应用中所面临的几项关键技术进行了论述,并重点研究了伪卫星空中基站的自身定位问题。从陆地上空伪卫星和海上伪卫星两个方面进行了仿真计算,分析了其几何精度因子随定位星座布局变化的规律,设计了最终的定位方案。  相似文献   
58.
宫悦  赵敏  龙锋  傅莺 《四川地震》2019,(3):1-4,12
Gong Yue;Zhao Min;LongFeng;Fu Ying(Sichuan Earthquake Agency,Sichuan Chengdu 610041,China)  相似文献   
59.
贵州台江凯里组的遗迹化石Treptichnus   总被引:2,自引:1,他引:2  
王约  王平丽 《地质论评》2006,52(1):1-10
贵州台江下中寒武统凯里组中产有丰富的、保存良好的Treptichnus Miller,计5个遗迹种(其中包括2个新遗迹种):T.bifurcus Miller,T.pedum(Seilacher),T.pollardi Buatois and Mdngano,T.arcus n.ichnosp.和T.taijiangensis n.ichnosp.,并与节肢动物的觅食迹、爬行迹和游泳迹等共生,属Cruziana遗迹相。产于凯里组的Treptichnus可能为节肢动物的居住迹。随着造迹生物身体的增长和沉积物的增厚,造迹生物在原潜穴的基础上不断地开拓新的潜穴,而构成三维空间复杂的潜穴系统。  相似文献   
60.
Day-to-day precipitation data of Junes during the 43 years of 1958-2000 from stations to the south of Yangtze River are used to divide regions and run statistical analysis of sustained torrential rainfall processes. A preliminary analysis is then made based on it and the results show that June is the month in which torrential rains in the southern half of China take place frequently and sustained torrential rains occur at the same time in South China and the area to the south of Yangtze River. In addition, the analysis gives the basic features of sustained torrential rains of June in China and their interannual variability patterns, with the suggestion that the amount of these events increases significantly after the 1990s. Lastly, the sustained torrential rains occurring in Junes of 1994, 1998 and 2005 in the southern half of China are taken as examples in the research on the basic patterns and formation mechanisms of the evolution of double rain-bands during the rain season in South China and the area to the south of Yangtze River. The analysis shows that the large scale environment field in which sustained torrential rains occur is related to the stable sustaining of the South Asia High and upper level jet streams.  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