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721.
da Silva Glauciene Justino Ferreira de Oliveira Nádja Melo Santos Celso Augusto Guimarães da Silva Richarde Marques 《Natural Hazards》2020,102(3):965-965
Natural Hazards - This correction stands to support the updating of the original article for changing the name Glauciene Justino Ferreira to Glauciene Justino Ferreira da Silva. The author group... 相似文献
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GPS Solutions - In addition to traditional tide gauges, the ground-based global navigation satellite system reflectometry (GNSS-R) that utilizes signal-to-noise ratio data from a single GNSS... 相似文献
727.
Assessing Seismic Damage Through Stochastic Simulation of Ground Shaking: The Case of the 1998 Faial Earthquake (Azores Islands) 总被引:2,自引:0,他引:2
G. Zonno C. S. Oliveira M. A. Ferreira G. Musacchio F. Meroni F. Mota-de-Sá F. Neves 《Surveys in Geophysics》2010,31(3):361-381
In July 1998, an M
w = 6.2 earthquake struck the islands of Faial, Pico and San Jorge (in the Azores Archipelago), registering VIII on the Modified
Mercalli Intensity scale and causing major destruction in the northeastern part of Faial. The main shock was located offshore,
8 km North East of the island, and it triggered a seismic sequence that lasted for several weeks. The existing data for this
earthquake include both the general tectonic environment of the region and the teleseismic information. This is accompanied
by one strong-motion record obtained 15 km from the epicentre, the epicentre location of aftershocks, and a large collection
of the damage inflicted to the building stock (as poor rubble masonry, of 2–3 storeys). The present study was carried out
in two steps: first, with a finite-fault stochastic simulation method of ground motion at sites throughout the affected islands,
for two possible locations of the rupturing fault and for a large number of combinations of rupture mechanisms (as a parametric
analysis); secondly, the damage to buildings was modelled using a well-known macroseismic method that considers the building
typologies and their associated vulnerabilities. The main intent was to integrate different data (geological, seismological
and building features) to produce a scenario model to reproduce and justify the level of damage generated during the Faial
earthquake. Finally, through validation of the results provided by these different approaches, we obtained a complete procedure
for the parameters of a first model for the production of seismic damage scenarios for the Azores Islands region. 相似文献
728.
Rosa Marquillas Ignacio Sabino Alcides Nobrega Sial Cecilia del Papa Valderez Ferreira Stephen Matthews 《Journal of South American Earth Sciences》2007,23(4):304-320
The Maastrichtian–Danian limestones of the Yacoraite Formation (northwestern Argentina) show carbon and oxygen isotopic values consistent with shallow marine conditions. The members of the formation respond to different sedimentary environments and are characterised by distinctive stable isotopes and geochemistry. The basal Amblayo Member is composed of high-energy dolomitic limestones and limestones with positive isotopic values (+2‰ δ13C, +2‰ δ18O). The top of the member reveals an isotopic shift of δ13C (−5‰) and δ18O (−10‰), probably related to a descent in the sea level. The sandy Güemes Member has isotopically negative (−2‰ δ13C, −1‰ δ18O) limestones, principally controlled by water mixing, decreased organic productivity, and compositional changes in the carbonates. The isotopically lighter limestones are calcitic, with a greater terrigenous contribution and different geochemical composition (high Si–Mn–Fe–Na, low Ca–Mg–Sr). These isotopic and lithological changes relate to the Cretaceous–Palaeogene transition. The Alemanía Member, composed of dolomitic limestones and pelites, represents a return to marine conditions and shows a gradual increase in isotopic values, reaching values similar to those of the Amblayo Member. The Juramento Member, composed of stromatolite limestones, shows isotopic variations that can be correlated with the two well-defined, shallowing-upward sequences of the member. 相似文献
729.
Nemesio M. Pérez Pedro A. Hernández Eleazar Padrón Rafael Cartagena Rodolfo Olmos Francisco Barahona Gladys Melián Pedro Salazar Dina L. López 《Pure and Applied Geophysics》2006,163(4):883-896
On January 16, 2002, short-term unrest occurred at San Miguel volcano. A gas-and-steamash plume rose a few hundred meters
above the summit crater. An anomalous microseismicity pattern, about 75 events between 7:30 and 10:30 hours, was also observed.
Continuous monitoring of CO2 efflux on the volcano started on November 24, 2001, in the attempt to provide a multidisciplinary approach for its volcanic
surveillance. The background mean of the diffuse CO2 emission is about 16 g m-2 d-1, but a 17- fold increase, up to 270 g m-2 d-1, was detected on January 7, nine days before the January 2002 short-term unrest at San Miguel volcano. These observed anomalous
changes on diffuse CO2 degassing could be related to either a sharp increase of CO2 pressure within the volcanic-hydrothermal system or degassing from an uprising fresh gas-rich magma within the shallow plumbing
system of the volcano since meteorological fluctuations cannot explain this observed increase of diffuse CO2 emission. 相似文献
730.
Gins A. de Gea Roque Aguado Jos M. Castro Jos M. Molina Luis O'Dogherty Pedro A. Ruiz-Ortiz 《Cretaceous Research》2008,29(5-6):861
The Carbonero Formation represents a scarce, well documented example of Aptian anoxic facies in the Betic Cordillera. Generally, the Aptian record in the pelagic Subbetic basin is both very discontinuous and affected by frequent hiatuses, but in some subsident areas controlled by extensional faults (as in the Carbonero trough) an interesting record is preserved. The Carbonero Formation is characterised by a thick pelagic succession composed of marls with intercalations of calcareous turbidites and a thick interval of anoxic facies. This interval, dated as early Aptian, most likely represents the local expression of Ocean Anoxic Event 1a in the Subbetic basin. A multidisciplinary study including lithostratigraphy, biostratigraphy, and sedimentology has been carried out in the Carbonero Formation, with special attention to the anoxic interval. A collection of facies and sedimentary features has been characterised and interpreted, including barite concretions, calcareous concretions, black shales, siliceous marls and radiolarites, and calcareous turbidites. All these facies seem to have been deposited under oxygen-depleted conditions on a fault-bounded depression with a high subsidence rate. The accumulation and burial of sediments and the preservation of organic matter were controlled by both local and regional factors, such as the physiography of the basin and tectonic setting, as well as by global factors, such as palaeoceanographic and climatic changes. 相似文献