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341.
342.
Raman microspectrometry of fluid inclusions 总被引:45,自引:0,他引:45
Ernst A. J. Burke 《Lithos》2001,55(1-4):139-158
For many kinds of fluid inclusions, the coupling of microthermometry and Raman microspectrometry is still the only viable option to obtain compositions of single fluid inclusions. A review is given on the basis of 16 years of experience and helped with about 120 references of the instrumentation, analytical conditions and methodology of the application of Raman microspectrometry to gaseous, aqueous and hydrocarbon inclusions, and their daughter minerals. 相似文献
343.
Drill cores from a Bavarian hazardous waste landfill were investigated for their mineralogical composition. Because of the
formation of many new minerals, geochemical equilibrium calculations were performed to find the most stable state of the waste
body. A comparison of mineralogical observations and geochemical modelling was undertaken. The remaining solubilities of the
newly formed secondary mineral assemblages were calculated. Newly formed minerals were shown using electron microscopy.
Received: 26 November 1999 · Accepted: 15 May 2000 相似文献
344.
A. Alastuey A. Jimnez F. Plana X. Querol I. Surez-Ruiz 《International Journal of Coal Geology》2001,45(4)
This study is focused on the occurrence and distribution of mineral matter and major and trace elements in the high volatile bituminous coal from Puertollano (south-central Spain). The relationship between ash behaviour and inorganic composition, as well as the possible formation of fouling and slagging deposits in boilers during the conversion process, were investigated. The Puertollano coals do not exhibit plastic properties, despite their rank, probably because of their high ash and inertinite contents.The Puertollano coal has medium to low total S content (0.48% to 1.63% db, with a mean of 1.0% db) and is characterised by relatively high contents of Si, Pb, Sb, and Cs. Some elements such as As, Cd, Co, Cr, Cu, Ge, Li, Mn, Ni, W, and Zn are also present in relatively high contents. The enrichment in a number of heavy metals could be attributed to the common sulphide ores occurring near the Puertollano coal deposit.The following trace elements affinities are deduced: (a) sulphide affinity: As, Co, Cd, Cu, Ni, Sb, Tl, and Zn; (b) aluminum–silicate affinity: K, Ti, B, Co, Cr, Cs, Cu Ga, Hf, Li, Nb, Rb, Sn, Ta, Th, V, Zr, and LREE; (c) Carbonate affinity: Ca, Mg, Mn, and B; (d) organic affinity: B.The very high Si levels and the anomalous enrichment in Cs, Ge, Pb, Sb, and Zn shown by the Puertollano coals account for the high contents of these elements in the Puertollano fly ash when compared with the other Spanish coal fly ashes.The chemical composition of the high temperature ash (HTA) is consistent with the trend shown by the ash fusion temperatures (AFT) and also with the predictive indices related to slagging and fouling propensities. Thus, the ash fusion temperatures increase with high values of Al2O3 as well as with the decrease in Fe2O3, CaO, and MgO. 相似文献
345.
Geochemical processes controlling silica concentrations in groundwaters of the Salado River drainage basin, Argentina 总被引:1,自引:0,他引:1
Chemical analyses of dissolved silica in the shallow groundwater of the lower part of the Salado River drainage basin indicate that silica values averaged 60 ppm. The groundwaters are oversaturated in relation to quartz, Na-plagioclase, K-feldspar, and the weathering of quartz and aluminosilicates appear to have little control on silica concentrations in solution. Groundwater is undersaturated with respect to amorphous silica present in the loessic sediments, and these sediments are specially important in the control of the groundwater composition. The sources of amorphous silica are volcanic glass shards and biogenic silica derived from plant (silicophytoliths, diatom frustules) or animal remains (sponge spicules) also present in the Pampean loess. Silicophytoliths and diatoms have also been reported in A soil horizon samples. The dissolution of amorphous silica most likely controls the high dissolved silica concentrations in groundwater. 相似文献
346.
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348.
华北石炭二叠纪煤系中I/S间层矿物的研究 总被引:1,自引:1,他引:1
华北石炭二叠煤系中的I/S间层粘土岩夹矸或粘土岩层,在太行山以东较为发育。I/S间层矿物的类型有累托石、IS有序间层矿物、S/I无序间层矿物,它们是在近岸泥岩沼泽或沼泽环境中由同期降落的火山灰蚀变而成,在酸性介质的影响下,形成IS有序间层矿物,在偏碱性的介质条件下,形成S/I无序间层矿物;高压异常区则形成累托石。 相似文献
349.
瑶岗仙钨矿床的晶洞特征及其研究意义 总被引:1,自引:0,他引:1
瑶岗仙黑钨矿床石英脉的地质特征、晶洞类型、含晶标志,分布规律以及晶洞发育的控制因素研究表明,矿区第Ⅱ成矿期矿脉的晶洞规模,分布、优美晶体、晶簇天然观赏矿物的成生,具有一定的理论,经济研究意义。 相似文献
350.
The Late Cretaceous Brezová and Myjava Groups of the Western Carpathians in Slovakia and formations of the Gosau Group of the Northern Calcareous Alps in Lower Austria comprise similar successions of alluvial/shallow marine deposits overlain by deep water hemipelagic sediments and turbidites. In both areas the heavy mineral spectra of Late Cretaceous sediments contain significant amounts of detrital chrome spinel. In the Early Tertiary the amount of garnet increases. Cluster analysis and correspondence analysis of Coniacian/Santonian and Campanian/Early Maastrichtian heavy mineral data indicate strong similarities between the Gosau deposits of the Lunz Nappe of the north-eastern part of the Northern Calcareous Alps and the Brezova Group of the Western Carpathians. Similar source areas and a similar palaeogeographical position at the northern active margin of the Adriatic/Austroalpine plate are therefore suggested for the two tectonic units.Basin subsidence mechanisms within the Late Cretaceous of the Northern Calcareous Alps are correlated with the Western Carpathians. Subsidence during the Campanian-Maastrichtian is interpreted as a consequence of subduction tectonic erosion along the active northern margin of the Adriatic/Austroalpine plate. Analogous facies and heavy mineral associations from deep water sandstones of the Manin Unit and the Klape Unit indicate accretion of parts of the Pieniny Klippen Belt during the Late Cretaceous along the Adriatic/Austroalpine margin. 相似文献