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991.
热解地化录井可以检测储集层含油气总量,推算原油密度值,结合储集层孔隙度值和储层岩石密度,经过换算可得出含油饱和度。热解地化录井含油饱和度是基于热解地化参数而获得,获取的机制是直接检测与合理的理论恢复相结合,能够客观的反映储层中所含油气的数量,评价储集层的性质,经试油结论验证,随钻评价结论与实际情况相符良好。 相似文献
992.
We present here a methodology implemented within a geographical information system (GIS) for hazard mapping of small volume
pyroclastic density currents (PDCs). This technique is implemented as a set of macros written in Visual Basic for Applications
(VBA) that run within GIS-software (i.e. ArcGIS). Based on the energy line concept, we calibrated an equation that relates
the volume (V) and the mobility (ΔH/L) of single PDCs using data from Soufrière Hills volcano (Montserrat) and Arenal volcano (Costa Rica). Maximum potential run-outs
can be predicted with an associated uncertainty of about 30%. Also based on the energy line concept and with data from Soufrière
Hills volcano and Mt. St. Helens (USA), we were able to calibrate an equation that predicts the flow velocity as a function
of the vertical distance between the energy line and the ground surface (Δh). Velocities derived in this way have an associated uncertainty of 3 m s−1. We wrote code to implement these equations and allow the automatic mapping of run-out and velocity with the inputs being
(i) the height and location of the vent (ii) the flow volume and (iii) a digital elevation model (DEM) of the volcano. Dynamic
pressure can also be estimated and mapped by incorporating the density of the pyroclastic density current (PDC). This computer
application allows the incorporation of uncertainties in the location of the vent and of statistical uncertainties expressed
by the 95% confidence limits of the regression model. We were able to verify predictions by the proposed methodology with
data from Unzen volcano (Japan) and Mayon volcano (The Philippines). The consistencies observed highlight the applicability
of this approach for hazard mitigation and real-time emergency management. 相似文献
993.
运用美国生产的高密度电法仪器对峪耳崖金矿区16~28线进行了测量。该仪器可同时测得视电阻率和视充电率2种数据,并可自动成图和地形改正。通过高密度电法工作圈定了地表较浅部的矿化异常区,除主要矿化异常赋存于岩体接触带外,在灰岩中也发现高极化异常区,表明在灰岩地层内也存在金属硫化物矿化现象,这为下一步找矿工作提供了新的思路和方向。通过钻探结果确定该矿区异常区有2种类型,即高阻高充电异常和低阻高充电异常,主要分布在岩性的接触带附近,尤其是内接触带。 相似文献
994.
Takamitsu Yamanaka Yutaka Komatsu Hironori Nomori 《Physics and Chemistry of Minerals》2007,34(5):307-318
Many of ilmenites ABO3 compounds bearing transition elements have semiconductive, ferroelectric and antiferromagnetic properties. The high-pressure
diffraction studies of FeTiO3 have been conducted up to 8.2 GPa using synchrotron radiation in KEK at Tsukuba with diamond anvil cell. The compression
mechanism of FeTiO3 ilmenite has been investigated by the structure refinements converged to the reliable factors R = 0.05. The deformations of the FeO6 and TiO6 octahedra were reduced with increasing pressure. In order to elucidate the electric conductivity change with pressure, electron
density distribution of ilmenite have been executed by maximum entropy method (MEM) using single-crystal diffraction intensity
data. MEM based on F
obs(hkl) of FeTiO3 clearly shows electron density in comparison with the difference Fourier synthesis based on F
obs(hkl) − F
calc(hkl). The radial distribution of the electron density indicates electron localization around the cation positions. The bonding
electron density found in bond Fe–O and Ti–O is lowered with pressure. The isotropic temperature factors B
iso become smaller with increasing pressure. Nevertheless the thermal vibration is considerably restrained by the compression,
the electric conductivity is enhanced with pressure. Neither charge transfer nor electron hopping between Fe and Ti along
the c axis in FeTiO3 is plausible under high pressure. But the electric conductivity due to electron super-exchange in Fe–Fe and Ti–Ti has been
clarified by the MEM electron density distribution. The anisotropy in the electric conductivity has been clarified. 相似文献
995.
Danilo R. Velis 《Mathematical Geology》2007,39(4):409-417
Stationary segments in well log sequences can be automatically detected by searching for change points in the data. These
change points, which correspond to abrupt changes in the statistical nature of the underlying process, can be identified by
analysing the probability density functions of two adjacent sub-samples as they move along the data sequence. A statistical
test is used to set a significance level of the probability that the two distributions are the same, thus providing a means
to decide how many segments comprise the data by keeping those change points that yield low probabilities. Data from the Ocean
Drilling Program were analysed, where a high correlation between the available core-log lithology interpretation and the statistical
segmentation was observed. Results show that the proposed algorithm can be used as an auxiliary tool in the analysis and interpretation
of geophysical log data for the identification of lithology units and sequences. 相似文献
996.
在塔克拉玛干沙漠腹地通过分层分段挖掘法对滴灌条件下多枝柽柳(Tamarix ramosis-sima)和梭梭(Haloxylon ammodendron)幼苗根区有效根长密度和有效根重密度空间分布进行了研究。结果表明:梭梭幼苗平均有效根系密度为多枝柽柳幼苗的3倍左右。在垂直方向上,两种灌木的有效根系密度的变化因树种而异,多枝柽柳幼苗随土层深度的增加呈指数递减,而梭梭幼苗随土层深度的增加呈单峰型曲线。在水平方向上,两种灌木幼苗有效根系密度均随距离植株基径距离的增加呈指数递减。非线性参数拟合分析表明:采用RD=eA BX CZ函数模型能较好地反映滴灌条件下多枝柽柳幼苗的有效根系密度的空间分布。 相似文献
997.
Monitoring the three-dimensional ionospheric electron density distribution using GPS observations over China 总被引:3,自引:0,他引:3
In this paper, an IRI model assisted GPS-based Computerized Ionospheric Tomography (CIT) technique is developed to inverse
the ionospheric electron density (IED) distribution over China. Essentially, an improved algebraic reconstruction technique
(IART) is first proposed to reconstruct the ionospheric images with high resolution and high efficiency. A numerical experiment
is used to validate the reliability of the method and its advantages to the classical algebraic reconstruction technique (ART).
This is then used to reconstruct the IED images using the GPS data in China. The variations of the IED during magnetically
quiet and disturbed days are reported and analyzed here. Reconstructed results during magnetically quiet days show some prominent
ionospheric features such as the development of equatorial anomaly and the tilt of ionization crest. Meanwhile, ionospheric
storm phase effects and disturbed features can also be revealed from the reconstructed IED image under storm conditions. Research
shows that the positive storm phase effects usually happen in southern China, and the negative storm phase effects mainly
occur in northern China. The equatorial anomaly crest moved to the north in the main phase of the storm. Ionosonde data recorded
at Wuhan station provides the verification for the reliability of GPS-based CIT technique. 相似文献
998.
考虑频散介质的电磁波传播,采用Cole-Cole公式建立频散模型。只考虑介质的介电常数随外加电磁场频率的变化,采用高密度采样滤波算法,模拟层状介质的雷达响应,从中可以看出频散介质对雷达波的衰减影响。 相似文献
999.
针对重力异常反演的现状,采用矩形单元体网格剖分的二度半体组合模型,模拟任意的多层密度界面或形体,实现了重力正演.该建模方法适应性强,适合于实际工作中常见的密度横向变化的复杂模型.使用改进的全局寻优的快速模拟退火算法,对重力异常进行反演,结合这种灵活的密度建模方法,反演过程中只需要反演各矩形单元体的密度参数,即可同时得到地质体的界面或形态以及密度值分布.通过复杂界面和形体的模型试验,证明了方法的效果.在江苏下扬子地质构造复杂区的实际应用说明,在地震等先验信息约束下,该重力反演方法提高了反演精度并减少了多解性,可有效解决古生界泥盆系-志留系目的层分布等地质问题. 相似文献
1000.
班公湖-怒江缝合带分隔了青藏高原拉萨地块和羌塘地块, 该带域岩样采集与分析对于该区地球物理资料深化解释、拉萨地块和羌塘地块拼贴碰撞过程的理解等均具有重要意义. 1995年在措勤盆地中采集了3条剖面、从奥陶纪至第四系不同地质年代地层岩石标本共计2500块. 通过岩石密度测试, 获得了研究区不同地质年代岩石密度测量结果. 结果表明, 岩石由老到新密度变化范围为278~253 g/cm3;各相邻地质时代间岩石密度差基本上为010 g/cm3, 白垩与侏罗、二叠与三叠之间岩石密度差最大为012~013 g/cm3 在措勤盆地内不同构造单元间岩石密度存在明显的纵横向非均一性. 相似文献