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   1015篇
  免费   258篇
  国内免费   177篇
测绘学   3篇
大气科学   32篇
地球物理   467篇
地质学   644篇
海洋学   47篇
天文学   10篇
综合类   33篇
自然地理   214篇
  2024年   5篇
  2023年   7篇
  2022年   22篇
  2021年   30篇
  2020年   27篇
  2019年   42篇
  2018年   46篇
  2017年   37篇
  2016年   46篇
  2015年   30篇
  2014年   64篇
  2013年   73篇
  2012年   44篇
  2011年   45篇
  2010年   43篇
  2009年   62篇
  2008年   66篇
  2007年   65篇
  2006年   75篇
  2005年   73篇
  2004年   54篇
  2003年   42篇
  2002年   57篇
  2001年   40篇
  2000年   37篇
  1999年   44篇
  1998年   35篇
  1997年   26篇
  1996年   27篇
  1995年   23篇
  1994年   32篇
  1993年   21篇
  1992年   21篇
  1991年   13篇
  1990年   21篇
  1989年   6篇
  1988年   7篇
  1987年   19篇
  1986年   5篇
  1985年   4篇
  1983年   1篇
  1982年   3篇
  1981年   2篇
  1980年   1篇
  1978年   4篇
  1976年   1篇
  1954年   2篇
排序方式: 共有1450条查询结果,搜索用时 250 毫秒
91.
Among the first measurements made from near-Earth orbiting satellites were measurements of the magnetic field. The sources of that field lie both within the Earth, in its core and crust, and in the surrounding ionosphere and magnetosphere. This article summarizes some of the methodology and results for studies of the Earth’s mantle and crust. Mantle conductivity studies can be made either by studying signals impressed on the Earth from outside, e.g., the ionosphere or magnetosphere, or by studying signals originating in the core and transmitted through the mantle. Crustal field studies begin with a careful selection of the data and subsequent removal of core and external fields by some sort of filtering. Average maps from different local times sometimes differ, presumably due to the remaining presence of fields of external origin. Several techniques for further filtering are discussed. Where large-area aeromagnetic maps are available, crustal maps derived from satellite data can be compared with upward continued data. In general, the comparisons show agreement, with some differences, particularly in and near the auroral belts. The satellite data are further reduced by various methods of inverse and forward modelling, sometimes including reduction to the pole (RTP). These techniques are generally unstable at the equator. Common methods of stabilizing the inversions include principle components analysis and ridge regression. Because of the presence of the core field, the entire crustal contribution from the field is not known. Also, there is a basic nonuniqueness to the inverse solutions. Nevertheless, magnetizations that are interpretable can be derived.  相似文献   
92.
Rainfall experiments have been conducted in the laboratory in order to assess the hydrological response of top soils very susceptible to surface sealing and containing rock fragments in different positions with respect to the soil surface. For a given cover level, rock fragment position in the top soil has an ambivalent effect on water intake and runoff generation. Compared to a bare soil surface rock fragments increase water intake rates as well as time of runoff concentration and decrease runoff volume if they rest on the soil surface. For the same cover level, rock fragments reduce infiltration rate and enhance runoff generation if they are well embedded in the top layer. The effects of rock fragment position on infiltration rate and runoff generation are proportional to cover percentage. Micromorphological analysis and measurements of the saturated hydraulic conductivity of bare top soils and of the top layer underneath rock fragments resting on the soil surface reveal significant differences supporting the mechanism proposed by Poesen (1986): i.e. runoff generated as rock flow or as Horton overland flow can (partly) infiltrate into the unsealed soil surface under the rock fragments, provided that they are not completely embedded in the top layer. Hence, rock fragment position, beside other rock fragment properties, should be taken into account when assessing the hydrological response of soils susceptible to surface sealing and containing rock fragments in their surface layers. A simple model, based on the proportions of bare soil surface, soil surface occupied by embedded rock fragments, and soil surface covered with rock fragments resting on the soil surface, describes the runoff coefficient data relatively well.  相似文献   
93.
离子色谱—双电导法同时测定水样中多种阴离子的研究   总被引:2,自引:0,他引:2  
吕伟  徐魁安 《岩矿测试》1991,10(1):25-29
本文在Dionex2020i离子色谱仪上,选用0.61×10~(-3)mol/L NaHCO_3-1.61×10~(-3)mol/LNa_2CO_3水溶液作淋洗液,在HPIC-AS4A阴离子分离柱上分离痕量F~-、NO_2~-、Br~-和较高浓度的Cl~-、NO_3~-、SO_4~(2-);选用2.0×10~(-3)mol/L TBAOH-6%CH_3CN水溶液作淋洗液,在MPIC-NS1分离柱上分离痕量F~-、Br~-和较高浓度的Cl~-,然后用串联双电导检测器的不同输出范围分别同时定量测定。本法特别适用于相邻两种离子浓度相差较大,前面高含量的离子对后面痕量离子测定有干扰的样品。用本文拟定的HPIC方法测定除铬后的地下水样中多种阴离子的结果与文献值吻合。  相似文献   
94.
The variability of sedimentary thermal conductivities with increasing temperature are explored for their impact on estimates of present-day heat flux and subsurface temperature gradient. For sand thicknesses less than about 10–20 km, or shale thicknesses less than about 40–80 km, the subsurface temperature is closely linearly proportional to the thermal resistance integral obtained in the absence of the temperature dependence of thermal conductivity. Estimates of heat flux should be increased (decreased) by about 5% for sands and decreased by about 1% for shales. For salt, because of the much shorter temperature range over which its thermal conductivity decreases, effects produced by the temperature dependence are more noticeable: heat flux should be increased by around 13%, salt thicknesses in excess of 5 km will yield major (around 30–100°C) changes in their temperature regimes solely as a consequence of the temperature-dependent thermal conductivity, and the linear increase of temperature with increasing thermal resistance is not an adequate approximation but has to be replaced with a more exact exponential increase.The impact of the variations, particularly in the case of salt, for geologic processes is briefly considered.  相似文献   
95.
为剖析咸水进水位异常,我们对位于唐山地震区附近的双桥1号井,双桥2号井及东台子井进行了多次井内垂向电导度的测量。在1991年10月5日宁河ML4.6级地震及1992年7月22日宁河ML4.9级地震前井下水电导度特别是含水层部位水电导度都曾出现过高值异常,这对于判别不异常是由于咸水层压力变化还是外来水的侵入是一种行之有效的简便的监测方法。  相似文献   
96.
Sq外源和内源电流体系的经度效应和UT变化   总被引:4,自引:0,他引:4       下载免费PDF全文
根据IGY/IGC期间全球地磁台网以及中国地磁台站的资料,计算出每-UT小时的S外源和内源电流体系.对S电流体系UT变化和经度效应的分析研究表明,S外源电流体系的空间图案没有显著的UT变化,电流涡焦点的地理纬度与磁赤道有密切关系,其变化范围,北半球为25°-35°N,南半球为30°-42.5°S.外源电流总强度的平均值为229kA(北半球)和173kA(南半球),其变化范围为±50kA(北半球)和±40kA(南半球).S内源电流体系的图案和强度有显著的UT变化,电流体系焦点纬度有类似于外源电流系的变化.在大西洋、印度洋、北太平洋地区,内源电流体系的总强度明显小于大陆地区的内源电流强度,表明这些大洋地区上地幔电导率低于大陆地区.  相似文献   
97.
氧化镍、二氧化钛高压相变及电导率压力效应   总被引:1,自引:0,他引:1       下载免费PDF全文
采用金刚石对顶砧压腔静高压技术,对氧化镍、二氧化钛在0-32GPa压力范围内的电导率进行了测量.结果表明,电导率-压力关系曲线上的一些特征点与同一物质的高压相交点具有一致性.  相似文献   
98.
Anomalous induction across Europe   总被引:1,自引:0,他引:1  
Summary Using real induction vector data, collected at 958 European observation sites, together with our data from the Bohemian Massif and the West Carpathians, we have generated a contour map of the transfer function TF1 (corresponding to transfer function A in Wiese's relation). Only the zero contour is retained and shown on the map. It clearly marks the main anomalous induction zones, related to internal structural inhomogeneities, across Europe.  相似文献   
99.
Researchonearthquakepredictionfromgeomagneticpulsation周军成,韩克礼,王培德,鲁跃Jun-ChengZHOU;Ke-LiHAN;Pei-DeWANGandYueLU(InstituteofGeop...  相似文献   
100.
Electrical properties of rocks depend on composition (i.e. bulk properties of the constituents), micro structure (i.e. geometrical arrangement of the constituents) and interfacial effects. We consider here a rock as a three component system — grains, pores, and interfaces — in order to account for the observed behaviour. We review first the main results relative to DC. conductivity. Surface conductivity effects show up clearly in the case of shaly formations or at low salinities. Although Archies' law (1942) and Waxman and Smits model (1968) are widely used, a more physically based model is that of Johnson and Sen (1988). We review also the variable frequency conductivity (complex conductivity) data and models. The important effect in that case is the enhancement of the dielectric constant at low frequencies (Knight and Nur, 1987) which can be interpreted as a geometrical effect although electrochemical interactions may also play an important role at low frequencies, depending on the rock type.  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