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   4772篇
  免费   913篇
  国内免费   1300篇
测绘学   619篇
大气科学   848篇
地球物理   1058篇
地质学   2364篇
海洋学   941篇
天文学   275篇
综合类   368篇
自然地理   512篇
  2024年   22篇
  2023年   79篇
  2022年   181篇
  2021年   205篇
  2020年   213篇
  2019年   278篇
  2018年   208篇
  2017年   210篇
  2016年   240篇
  2015年   263篇
  2014年   342篇
  2013年   364篇
  2012年   297篇
  2011年   319篇
  2010年   238篇
  2009年   339篇
  2008年   376篇
  2007年   335篇
  2006年   354篇
  2005年   298篇
  2004年   270篇
  2003年   199篇
  2002年   184篇
  2001年   139篇
  2000年   150篇
  1999年   133篇
  1998年   122篇
  1997年   101篇
  1996年   87篇
  1995年   80篇
  1994年   76篇
  1993年   56篇
  1992年   56篇
  1991年   33篇
  1990年   34篇
  1989年   22篇
  1988年   21篇
  1987年   6篇
  1986年   11篇
  1985年   11篇
  1984年   11篇
  1983年   5篇
  1981年   3篇
  1978年   3篇
  1977年   1篇
  1954年   4篇
  1915年   1篇
  1905年   2篇
  1900年   1篇
  1897年   1篇
排序方式: 共有6985条查询结果,搜索用时 234 毫秒
111.
Authigenic albites in carbonate rocks typically grow in a high-grade diagenetic to low-grade metamorphic environment and often show Roc-Tourné-twinning sensu Füchtbauer. Based on an investigation of four Middle to South European occurrences, they show Mn2+- and Fe3+-activated cathodoluminescence (CL), as revealed by combined high resolution spectroscopy of cathodoluminescence emission (HRS-CL), electron paramagnetic resonance (EPR), and proton-induced X-ray emission (μPIXE).  相似文献   
112.
2000年4月29日11时54分,河南省南阳市内乡县马山口镇与镇平县寺山乡之间发生一次ML4.7级地震。地震前3天,潢山台视电阻率ρs异常较为明显。分析了此次异常与内乡ML4.7级地震的关系,认为此次异常很有可能是内乡ML4.7级地震的短临前兆异常。当观测台站与震源位于同一构造带时,即便离震中较远,地电阻率对地震异常反映仍较灵敏,且与构造带同一走向的测向尤为明显。  相似文献   
113.
赵爱平  吴敏 《华南地震》2002,22(4):79-84
通过月整点值数据文件和滑动值数据文件这两种数据处理形式。对九江台地倾斜资料进行调和分析计算。分析了M2潮汐因子与瑞昌ML4.9级地震的关系。认为存在震前短临异常或震后异常,并与趋势异常得到相互印证。  相似文献   
114.
IntroductionTrial-and-error forward modeling of wide-angle seismic reflection/refraction traveltimes for 2-D velocity structure is extremely time-consuming, even for experienced data interpreters. For wide-angle seismic reflection/refraction experiments that consist of numerous shots along a single line, it is quite difficult through repeated trial-and-error forward modeling to construct a 2-D model that fits the data within acceptable limits (Cerveny, et al, 1977; ZHANG, et al, 200 . In ad…  相似文献   
115.
Melting relations of β-quartz were experimentally determined at 1.0 GPa (1900±20 °C), 1.5 GPa (2033±20 °C), and 2.0 GPa (2145±20 °C) using a new high-pressure assembly in a piston–cylinder apparatus and substantial differences were found with data previously reported. The new melting data of β-quartz were combined and optimized with all available thermodynamic, volumetric, and phase equilibria data for β-cristobalite, β-quartz and coesite to produce a PT liquidus diagram for silica valid up to 6.0 GPa. Using the new optimized thermodynamic parameters, the invariant point β-cristobalite+β-quartz+liquid and β-quartz+coesite+liquid were determined to lie at 1687±17 °C and 0.457 GPa, and 2425±25 °C and 5.00 GPa, respectively.  相似文献   
116.
117.
Fe‐rich metapelitic granulites of the Musgrave Block, central Australia, contain several symplectic and coronal reaction textures that post‐date a peak S2 metamorphic assemblage involving garnet, sillimanite, spinel, ilmenite, K‐feldspar and quartz. The earliest reaction textures involve spinel‐ and quartz‐bearing symplectites that enclose garnet and to a lesser extent sillimanite. The symplectic spinel and quartz are in places separated by later garnet and/or sillimanite coronas. The metamorphic effects of a later, D3, event are restricted to zones of moderate to high strain where a metamorphic assemblage of garnet, sillimanite, K‐feldspar, magnetite, ilmenite, quartz and biotite is preserved. Quantitative mineral equilibria calculations in the system K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–Fe2O3 (KFMASHTO) using Thermocalc 3.0 and the accompanying internally consistent dataset provide important constraints on the influence of TiO2 and Fe2O3 on biotite‐bearing and spinel‐bearing equilibria, respectively. Biotite‐bearing equilibria are shifted to higher temperatures and spinel‐bearing equilibria to higher pressures and lower temperatures in comparison to the equivalent equilibria in K2O–FeO–MgO–Al2O3–SiO2–H2O (KFMASH). The sequence of reaction textures involving spinel is consistent with a D2 P–T path that involved a small amount of decompression followed predominantly by cooling within a single mineral assemblage stability field. Thus, the reaction textures reflect changes in modal proportions within an equilibrium assemblage rather than the crossing of a univariant reaction. The D3 metamorphic assemblage is consistent with lower temperatures than those inferred for D2.  相似文献   
118.
Lunan stone forest is a kind of typical karst in China, which is mainly developed under red soil. In the winter of 1999, three study sites were chosen in stone forest national park according to vegetation cover, geomorphologic location and soil types. CO2 concentration was measured with Gastec pump at different depths of soil (20, 40, 60 cm) and at the same time soil samples were gathered and soil properties such as soil moisture, pH, soil organic content were analyzed and the total number of viable microbes were counted in laboratory. In the study, dependent variable was chosen as the mean soil log (PCO2), and soil properties were chosen as the independent variables. Multiple stepwise regression analysis showed that the total amount of microbes and soil moisture are the best indicators of the CO2 production, with the equation LOG(PCO2) = - 0.039(TNM) - 0.056(Mo) + 1.215 accounting for 86% of the variation of the soil CO2 concentration, where TNM is the total number of microbes in the soil and Mo is the moisture of soil sample.  相似文献   
119.
用θ~ 2θ型粉末衍射仪反射法精确测量了不同浓度的Li2 SO4水溶液的衍射数据 ,通过数据处理给出了溶液的结构函数和径向分布函数 ,由几何结构模型的最小二乘法精修 ,得到了溶液中阳离子和阴离子第一、二水合层的结构参数。  相似文献   
120.
光催化氧化法处理难降解废水的研究进展   总被引:8,自引:3,他引:8  
综述了光催化氧化处理难降解废水的研究现状及发展趋势。介绍了影响光催化氧化反应速率的因素及光催化氧化法在处理难降解废水中的应用。  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