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451.
Caterina E. Tommaseo Jim Devine Sébastien Merkel Sergio Speziale Hans-Rudolf Wenk 《Physics and Chemistry of Minerals》2006,33(2):84-97
Cubic magnesiowűstite has been deformed in a diamond anvil cell at room temperature. We present results for (Mg0.4Fe0.6)O, (Mg0.25Fe0.75)O, and (Mg0.1Fe0.9)O up to 37, 16, and 18 GPa, respectively. The diffraction images, obtained with the radial diffraction technique, are analyzed using both single peak intensities and a Rietveld method. For all samples, we observe a [100] fiber texture but the texture strength decreases with increasing iron content. This texture pattern is consistent with {110}〈1-10〉 slip. The images were also analyzed for stress, elastic strains, and elastic anisotropy. In general, the stress measured in magnesiowűstite samples is lower than previously measured on MgO. The elastic anisotropy deduced from the X-ray measurements shows a broad agreement with models based on measurements with other techniques. 相似文献
452.
Proposed method for groundwater vulnerability mapping in carbonate (karstic) aquifers: the COP method 总被引:4,自引:1,他引:4
J. M. Vías B. Andreo M. J. Perles F. Carrasco I. Vadillo P. Jiménez 《Hydrogeology Journal》2006,14(6):912-925
The ‘COP method’ has been developed for the assessment of intrinsic vulnerability of carbonate aquifers in the frame of the European COST Action 620. This method uses the properties of overlying layers above the water table (O factor), the concentration of flow (C factor) and precipitation (P factor) over the aquifer, as the parameters to assess the intrinsic vulnerability of groundwater. This method considers karst characteristics, such as the presence of swallow holes (C factor) and their catchment areas as well as karstic landforms, as factors which decrease the natural protection provided by overlying layers (O factor). The P factor allows for consideration of the spatial and temporal variability of precipitation, which is considered the transport agent of contamination. Two carbonate aquifers in the South of Spain, Sierra de Líbar (a conduit flow system) and Torremolinos (a diffuse flow system), have been selected for the application and validation of the method and the results have been compared with three methods widely applied in different aquifers around the world (AVI, GOD and DRASTIC). Comparisons with these methods and validation tools (hydrogeological data and tracer test) show the advantages of the COP method in the assessment of vulnerability of karstic groundwaters. 相似文献
453.
454.
María Eugenia Pérez González María del Pilar García Rodríguez Vanesa González-Quiñones Raimundo Jiménez Ballesta 《Environmental Geology》2006,51(1):143-149
The spatial variability of the quality of the soil on the shores of a lagoon affected by hydromorphy and/or salinity can be identified (Laguna de Villacañas, Castilla La Mancha) by the use of multitemporal Landsat images in order to analyse these changes. For this purpose, TM and ETM images along with field observations and certain edaphic laboratory parameters are used. In order to identify saline-hydromorphic soils, the spatial variability of chemical and physical properties of a transect, which includes from Solonchaks to Regosols and Cambisols, have been correlated with the Normalised Difference Vegetation Index (NDVI). This index, chosen for specific dates, has proven to be very useful in detecting halophytic vegetation and relating it to the variability of the quality of these soils. 相似文献
455.
Rosario Turvey 《GeoJournal》2006,67(3):207-222
Research on the practice of adopting local economic development (LED) strategies is important to understand our local world
as it is and what it might be made to be as a place for community. This article on economic development strategies (EDS) highlights
the results from a survey of 82 small communities representing the Yukon Territory and ten provinces in Canada. The purpose
was to evaluate the positive and additive effects of past local action and community initiatives so as to understand the variation
in the adoption of local economic development strategies of Canada’s small towns and local municipalities. Using a questionnaire
as instrument for data collection, the study employed hierarchical regression analysis and principal component analysis (PCA)
as method for factor extraction and composite assessment on the effects of adopting EDS for community. The PCA solution was
applied to evaluate the structure of correlation between the community characteristics as control variables in the baseline
model for regression analysis and the past local action and community initiatives as independent variables. The results of
the hierarchical regression analysis showed that local initiatives have significant and additive effects on the adoption of
EDS by small communities. The study findings offer some insights into some perspectives of ‘development from within’ to mean
the local economic development practice in Canadian communities. 相似文献
456.
Richard Dawson Jim Hall Paul Sayers Paul Bates Corina Rosu 《Stochastic Environmental Research and Risk Assessment (SERRA)》2005,19(6):388-402
A dike system of moderate size has a large number of potential system states, and the loading imposed on the system is inherently
random. If the system should fail, in one of its many potential failure modes, the topography of UK floodplains is usually
such that hydrodynamic modelling of flood inundation is required to generate realistic estimates of flood depth and hence
damage. To do so for all possible failure states may require 1,000s of computationally expensive inundation simulations. A
risk-based sampling technique is proposed in order to reduce the computational resources required to estimate flood risk.
The approach is novel in that the loading and dike system states (obtained using a simplified reliability analysis) are sampled
according to the contribution that a given region of the space of basic variables makes to risk. The methodology is demonstrated
in a strategic flood risk assessment for the city of Burton-upon-Trent in the UK. 5,000 inundation model simulations were
run although it was shown that the flood risk estimate converged adequately after approximately half this number. The case
study demonstrates that, amongst other factors, risk is a complex function of loadings, dike resistance, floodplain topography
and the spatial distribution of floodplain assets. The application of this approach allows flood risk managers to obtain an
improved understanding of the flooding system, its vulnerabilities and the most efficient means of allocating resource to
improve performance. It may also be used to test how the system may respond to future external perturbations. 相似文献
457.
This is an analysis of the features of the new coordinate system given by the principal axes of inertia, as determined by Euler angles, and twodistances related to the inertia principal moments and an auxiliar angleas coordinates, for studying the general three-body problem, interactingthrough gravitational forces.The reduction of order is performed in these new coordinates by using the angular velocity vector or the Euler angles.The Eulerian case of collinear motion is revisited from our own perspective.The value of the auxiliar angle is computed for the Sun–Earth–Moon system. 相似文献
458.
José J. del Alonso Rosario M. Arias Ballesteros P. Villares Durán 《Stochastic Environmental Research and Risk Assessment (SERRA)》2007,21(3):259-272
The generation of internal lee waves (ILW) in the Strait of Gibraltar takes place in the main sill where the tidal flow interacts
with a submarine obstacle. The tidal flow is perturbed by subinertial phenomena of different nature summarized in the subinertial
currents that can inhibit the ILW generation. The authors present an attempt to randomize the problem by the introduction
of a Gaussian noise in the Taylor–Goldstein equation. The random number sets are generated from the statistical distribution
of the previously isolated random part of the subinertial currents from experimental data taken in the area during the Gibraltar
Experiment 94–96. The effect of the noise is translated into a continuous spreading of the spectrum around the solution of
the noise-free problem. A stability analysis is carried out in order to determine the single neutral modes of oscillations
and the phase space is divided onto regions of stability and instability as a function of the inflowing subinertial current.
The methodology and results could be useful for the design and timing of oceanographic surveys in straits where the ILWs occur. 相似文献
459.
New global positioning system reference station in Brazil 总被引:1,自引:0,他引:1
Co-located very long baseline interferometry (VLBI) and global positioning system (GPS) reference stations were installed near Fortaleza, Brazil, in 1993. Both have been important in the realization and maintenance of the International Terrestrial Reference Frame. A new-generation GPS system was installed in 2005 to replace the original station. Experience gained in the prior 12 years was used to improve the design of the GPS antenna mount. Preliminary indications are greatly improved data quality from the new station. Simultaneous observations from the nearly half-year of overlapping operation have been used to determine the local tie between the new and old GPS reference points to about 1 mm accuracy. This can be used to update the 1993 survey tie between the original GPS and the VLBI points, although there are questions about the accuracy of that measurement based on a comparison with space geodetic data. A test of removing the conical radome over the old GPS antenna indicates that it has biased the station height by about 16 mm downward, which probably accounts for most of the previous survey discrepancy. 相似文献
460.
美国需要改进干旱监测与评估方法。干旱是代价昂贵的自然灾害(联邦应急管理局(FEMA),1995;W ilhite,2000),但经常被评估和预报产品的开发者忽略。相比于其他灾害,干旱表现得更模糊并且不适合用传统的评估或预报方法,它相对缓慢的发生以及其影响的复杂性,需要有一套新的方法来对它进行评估。干旱监测和预报技术的提高会使我们为应对干旱灾害做更好的准备工作,进行更好的应对实践,从而减少社会对干旱及其影响的脆弱性。为追踪和展示全美国干旱的程度、空间范围以及其影响,开发了新的干旱监测工具,研发了每周发布的国家级干旱监测业务产品(th… 相似文献