全文获取类型
收费全文 | 820篇 |
免费 | 79篇 |
国内免费 | 12篇 |
专业分类
测绘学 | 10篇 |
大气科学 | 7篇 |
地球物理 | 254篇 |
地质学 | 517篇 |
海洋学 | 61篇 |
天文学 | 4篇 |
综合类 | 4篇 |
自然地理 | 54篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2019年 | 9篇 |
2018年 | 8篇 |
2017年 | 16篇 |
2016年 | 49篇 |
2015年 | 34篇 |
2014年 | 48篇 |
2013年 | 223篇 |
2012年 | 34篇 |
2011年 | 40篇 |
2010年 | 30篇 |
2009年 | 18篇 |
2008年 | 43篇 |
2007年 | 24篇 |
2006年 | 40篇 |
2005年 | 57篇 |
2004年 | 58篇 |
2003年 | 49篇 |
2002年 | 49篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 14篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有911条查询结果,搜索用时 93 毫秒
891.
V. M. Robles-Arenas R. Rodríguez C. García J. I. Manteca L. Candela 《Environmental Geology》2006,51(1):47-64
The environmental impact and potential-risk assessment of an abandoned sulphide-mining site in a semiarid climate is presented here, by the study case of Sierra de Cartagena–La Unión (SE Spain), a 2,500-year-old mining district extending over an area of 100 km2. The regional map illustrates the existence of 12 open-pits, 1,902 mining wells, 2,351 waste deposits, including 89 tailing dams and waste rock derived from mining processes. Mine wastes occupy an area of 9 km2 and have an approximate volume of 200 Mm3. Mineralogical, physical and chemical data distinguish nine different types of mine and metallurgical waste. According to the concentration of sulphate and heavy metals in sediment, soil, rainwater, surface water and groundwater samples, it is possible to conclude that the impact of mine activities occurs not only in the immediate mining area (100 km2), but also in the surrounding areas (an affected area of 1,000 km2 approximately). The hydrochemical data show that groundwater, runoff water and some rainwater samples exceed Spanish and European water quality guideline values for water supply. The main geochemical process recognised is sulphide-mineral oxidation and later-generated sulphate dissolution by groundwater and runoff. Runoff and wind are the major mechanisms of metals and sulphate transport in the study area and adjacent zones. 相似文献
892.
Franois-Xavier Le Bourdonnec Grard Poupeau Carlo Lugli 《Comptes Rendus Geoscience》2006,338(16):1150-1157
The contents of Na, Al, Si, K, Ca and Fe of 99 obsidians from the western Mediterranean islands of Lipari, Palmarola, Pantelleria and Sardinia were determined with the energy-dispersive spectrometer of a scanning electron microscope (SEM–EDS). The Na and in a lesser way other elements contents characterize any obsidian source-island. In Sardinia (80 samples), the four Monte Arci obsidian geochemical types can be discriminated from binary diagrams of element contents or by a discriminant analysis based on the six elements measured. It is concluded that SEM–EDS offers a new option for Neolithic obsidian provenance studies in this region. To cite this article: F.-X. Le Bourdonnec et al., C. R. Geoscience 338 (2006). 相似文献
893.
The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina 总被引:2,自引:0,他引:2
J.A. Dahlquist R.J. Pankhurst C.W. Rapela C. Casquet C.M. Fanning P. Alasino M. Baez 《Journal of South American Earth Sciences》2006,20(4):341-350
New geochronological and geochemical data are reported for the San Blas Pluton (SBP), in the northwestern Sierra de Velasco, Sierras Pampeanas, which intrudes Ordovician granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340±3 Ma is established by U–Pb dating of zircon using a sensitive high-resolution ion microprobe (SHRIMP). The SBP illustrates several petrological and geochemical characteristics of previously reported Carboniferous granitoids in the Sierras Pampeanas. Their generation is consistent with a regional reheating of the crust at approximately 342 Ma, which resulted in the formation of relatively large amounts of granitic melts that were emplaced in higher crustal levels along master fractures (older master shear zones of Lower Paleozoic age). The SBP can be chemically defined as a typical A-type granitoid related to postcollisonal or postorogenic magmatism. Its high REE content and extraordinarily high U and Th concentrations may have economic significance. Many previously published Devonian and Carboniferous K–Ar dates are reset Ordovician ages, but the existence of other Carboniferous bodies in the Sierra de Velasco cannot be discounted until detailed mapping of the whole Sierra is completed. 相似文献
894.
Benoît Laignel Emmanuel Dupuis Alain Durand Jean-Paul Dupont Emmanuel Hauchard Nicolas Massei 《Comptes Rendus Geoscience》2006,338(8):556-564
An accurate quantification of erosion, based on high-frequency monitoring of river discharge and suspended sediment fluxes is proposed for two watersheds in the western Paris Basin, a sensitive area with respect to erosion phenomena. This continuous monitoring makes it possible to include flood events of short duration, but significant erosion potential. The obtained erosion rate (16 and 21 t?km?2?yr?1) is among the weakest of the planet (3.5 to 18?000 t?km?2?yr?1). However, this annual balance does not reflect the behaviour of these rivers which can be torrential in certain cases. To cite this article: B. Laignel et al., C. R. Geoscience 338 (2006). 相似文献
895.
Guillaume Bertrand Philippe Elsass Gunther Wirsing Alex Luz 《Comptes Rendus Geoscience》2006,338(8):574-580
A high-resolution multichannel seismic reflection river profiling campaign was completed in July 2002 in the southern Upper Rhine graben (URG), along the River Rhine. Preliminary results show apparent Quaternary vertical slip rates, on intra-graben faults that are relatively slow, of the order of a few thousandths to a few hundredths of mm/yr. Moreover, kinematical data from the Ludwigshafen area show decreasing vertical slip rates since the Middle Pleistocene and/or a migration of tectonic activity. While still preliminary, these data show inhomogeneous and relatively slow tectonic activity in the URG that could probably not alone have shaped the Quaternary graben morphology. To cite this article: G. Bertrand et al., C. R. Geoscience 338 (2006). 相似文献
896.
Gilles Grandjean Céline Pennetier Adnan Bitri Ombeline Meric Jean-Philippe Malet 《Comptes Rendus Geoscience》2006,338(9):587-595
Geophysical methods such as seismic surveying and electrical resistivity imaging appear to be well-adapted to investigate and understand landslide mechanisms. They allow direct and non-intrusive measurement of acoustic velocity and electrical resistivity, two fundamental parameters used to define the physical properties of the reworked moving materials. Both methods were applied at the Super-Sauze site in the French South Alps, where a typical example of an intra-material earthflow-mudslide can be observed. Measurements were taken simultaneously along two orthogonal profiles: one 325 m in length is perpendicular to the axis of the earthflow; the other 235 m in length is located along the axis of the earthflow. The results show a correlation between the seismic and electrical resistivity data, confirming that the simultaneous use of both methods gives complementary information about landslide mechanisms. The seismic data provide information on fracture density variations, whereas the electrical resistivity data provide information on water content variations. To cite this article: G. Grandjean et al., C. R. Geoscience 338 (2006). 相似文献
897.
Adam Ahmed Ali Paul Roiron Lucie Chabal Paul Ambert Jean Gasco Joël Andr Jean-Frdric Terral 《Comptes Rendus Geoscience》2008,340(6):356-366
A geobotanical study of the travertine system of Saint-Guilhem-le-Désert (southern France) was carried out in order to reconstruct the local Holocene environment in a region where the postglacial vegetation history is poorly documented. The travertinisation process has started at ca. 8500 cal. BP, in a landscape dominated by Pinus sylvestris type (probably Pinus nigra sub sp. salzmannii). Around 7000 cal. BP, the travertine system recorded torrential events not evidenced at the regional scale, showing the particularity of the Verdus hydrological regime. More recently, ca. 5100 cal. BP, a lake or a marsh was filled within the Verdus plain, as attested to by sand and silt particles accumulated in the sequence. The present-day vegetation dominated by Quercus ilex, on south facing slopes, was most likely established between the Bronze Age and the Gallo-Roman period correlatively to the decline of Pinus nigra and deciduous Quercus, most probably under human influence. 相似文献
898.
Changyi Shi Tiexin Gu Wei Bu Weidong Yan Mei Liu Mingcai Yan 《Geostandards and Geoanalytical Research》2008,32(3):337-345
The Institute of Geophysical and Geochemical Exploration in China recently prepared ten biogeochemical certified reference samples GSB1‐10 (CRMs). The samples are primary agricultural products such as rice, wheat, corn, soybean, cabbage, spinach, tea, powder, chicken and apple. Lyophilisation technology and a high‐alumina ball mill were used to process the samples. Fourteen laboratories and hundreds analysts in China participated in the certification analysis. Over ten reliable analytical methods, predominately ICP‐MS, ICP‐AES and INAA, were used for analysing the samples for fifty‐nine elements. A total of 22477 determinations led to 5136 average data sets. Certified values of fifty‐four elements were assigned. 相似文献
899.
A spectral approach to simulating intrinsic random fields with power and spline generalized covariances 总被引:4,自引:0,他引:4
This article presents a variant of the spectral turning bands method that allows fast and accurate simulation of intrinsic
random fields with power, spline, or logarithmic generalized covariances. The method is applicable in any workspace dimension
and is not restricted in the number and configuration of the locations where the random field is simulated; in particular,
it does not require these locations to be regularly spaced. On the basis of the central limit and Berry–Esséen theorems, an
upper bound is derived for the Kolmogorov distance between the distributions of generalized increments of the simulated random
fields and the normal distribution. 相似文献
900.
Analysis, in a free surface steady flow, of the interstitial velocity field inside a sedimentary bed
The objective of our study is to exploit ultrasonic Doppler velocimetry (UDV) to analyze the velocity field within a steady flow on a porous sedimentary bottom. Velocities are measured for several sedimentary beds, as well within the fluid vein as within the sediment. Our results highlight an exponential distribution of the velocities inside the sediment and a discontinuity of the velocity at the interface water–sediment, between the velocity in the free flow and the velocity within the sediment. These results highlight the need to base the analysis of sedimentary transport on the reality of the physical processes at the interface water–sediment. 相似文献