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排序方式: 共有271条查询结果,搜索用时 31 毫秒
71.
Dr. O. Schulz 《Mineralogy and Petrology》1972,18(2):114-128
Zusammenfassung Für die Baryt-Fahlerz-Lagerstätten im Schwazer Dolomit (Unterdevon) bei Brixlegg (Tirol, Österreich) liegen sehr differierende Altersangaben zwischen Tertiär und Oberkarbon vor. Hier werden am Beispiel des Bergbaues Großkogel Befunde dargelegt, welche hydrothermale Stoffzufuhren bereits im Unterdevon wahrscheinlich machen. Es wird submarine Entstehung mit der Anlage synsedimentärer schichtkonkordanter und-diskordanter Erzkörper angenommen. Der erzführende Sedimentkomplex liegt heute als steilachsige Großfalte vor. Die primäre Paragenese, hauptsächlich bestehend aus Quarz, Pyrit, Fahlerz und Baryt, wurde samt dem Nebengestein durch die Diagenese sowie durch die Auswirkungen der variszischen und alpidischen Orogenese und epizonalen Metamorphose im Gefüge verändert.
Mit 4 Abbildungen 相似文献
Early Devonian barite-tetrahedrite mineralization and its steep axial deformation in the Grosskogel near Brixlegg (Tyrol)
Summary Very different ages are attributed to the barite-tetrahedrite deposits in the Schwazer Dolomite (Early Devonian) near Brixlegg (Tyrol, Austria), varying between Tertiary and Upper Carboniferous. In this paper observations on the ore deposit of Grosskogel indicate an introduction of hydrothermal material probably in the Early Devonian. The deposit is believed to be of submarine origin with formation of synsedimentary conformable and inconformable ore bodies. The ore-bearing sedimentary complex now forms a large, steep axial fold. The primary paragenesis (consisting mainly of quartz, pyrite, tetrahedrite and barite) together with the wallrock, was altered by diagenesis, the effect of Variscian and Alpidian orogenesis, and by epizonal metamorphism.
Mit 4 Abbildungen 相似文献
72.
Runoff and peak flows in four experimental catchments with different land uses are analyzed for summer periods. The catchments have a rainy temperate climate with annual precipitations between 2000 and 2500 mm, 70% of which is concentrated in the winter period between May and August. The final harvest of the forest plantation in one of these catchments generated increases in summer runoff. Also, differences between the maximum instantaneous discharge and the flow at the beginning of the storm then almost duplicated those registered in rainfall events of similar magnitude when the catchment was fully forested. Runoff analysis in this catchment is difficult because the two post-harvesting summer periods are much wetter than the two pre-harvesting ones but a double mass analysis shows the effect of harvesting clearly. In a paired catchment study, low cover in one of the two neighbour catchments explains higher direct runoff and base flows although lower maximum instantaneous specific discharge occurred in the less vegetated but larger catchment. Low vegetation cover explains increases in summer flows, although the size, topography, rainfall conditions, road density, extent of affected area and runoff generation processes play an important role in the hydrological effects of different land uses. 相似文献
73.
Ritav Schulz 《Surveys in Geophysics》1997,18(1):39-55
The spectacular impact of D/Shoemaker-Levy 9 on Jupiter in July 1994 was observed all over the world and from space, leading to many new and exciting clues to the physics of the Jovian atmosphere. However, what do we know of the impactor? There were only 16 months to study D/Shoemaker-Levy 9 between its discovery and destruction. D/Shoemaker-Levy 9 was designated as a comet at time of discovery. Then, due to the apparent absence of volatiles usually present in comets it was repeatedly discussed whether D/Shoemaker-Levy 9 was a comet or an asteroid. Although its true nature can still not be named unambigeously, a cometary origin is indicated from the observational evidence. The results of the dust analysis are consistent with D/Shoemaker-Levy 9 being a typical comet and so far this is not contradicted by any observation. 相似文献
74.
Previous global models of coronal magnetic fields have used a geometrical construction based on a spherical source surface because of requirements for computational speed. As a result they have had difficulty accounting for (a) the tendency of full magnetohydrodynamic (MHD) models to predict non-radial plasma flow out to r 10r
and (b) the appreciable magnitude, 3, of B
r
, (the radial component of B) consistently observed at r 1 AU. We present a new modelling technique based on a non-spherical source surface, which is taken to be an isogauss of the underlying potential field generated by currents in or below the photosphere. This modification of the source surface significantly improves the agreement between the geometrical construction and the MHD solution while retaining most of the computational ease provided by a spherical source surface. A detailed comparison between the present source-surface model and the MHD solution is made for the internal dipole case. The resulting B field agrees well in magnitude and direction with the coronal B field derived from the full MHD equations. It shows evidence of the slightly equatorward meridional plasma flow that is characteristic of the MHD solution. Moreover, the B field obtained by using our non-spherical source surface agrees well with that observed by spacecraft in the vicinity of the Earth's orbit. Applied to a solar dipole field with a moment of 1 G-r
3
, the present model predicts that B
r
at r 1 AU lies in the range of 1–2 and is remarkably insensitive to heliomagnetic latitude. Our method should be applicable also to more general (i.e., more realistic) configurations of the solar magnetic field. Isogauss surfaces for two representative solar rotations, as calculated from expansions of observed photospheric magnetic-field data, are found to show large and significant deviations from sphericity. 相似文献
75.
E. Schulz A. Abichou T. Hachicha S. Pomel U. Salzmann K. Zouari 《Journal of African Earth Sciences》2002,34(3-4)
Sebkhas are temporary lacustrine systems depending on the number and extension of floodings. They may create laminated sediments which can be exploited as ecological archives. Contrary to those of meromictic lakes they are seasonal but not annual. After each flooding a detritus layer and a plasmo-condensed layer of bacteria and algae are formed in the water body or film and during the subsequent dessication a third subaeric layer of evaporites is build up. These laminae show a quasi-textile fabric and they can trap and conserve any dust and fine grained material. A high resolution pollendiagram covering the last two millennia as well as geochemical analysis from a southeastern Tunisian sebkha demonstrate the potentials of these ecological archives. 相似文献
76.
Gregory G. Lemaire Ursula S. McKnight Hanna Schulz Sandra Roost Poul L. Bjerg 《Ground Water Monitoring & Remediation》2020,40(2):40-51
Xenobiotic organic compounds can be discharged from contaminated groundwater inflow and may seep into streams from multiple pathways with very different dynamics, some not fully understood. In this study, we investigated the spatio-temporal variation of chlorinated ethenes discharging from a former industrial site (with two main contaminant sources, A and B) into a stream system in a heterogeneous clay till setting in eastern Denmark. The investigated reach and near-stream surroundings are representative of peri-urban settings, with a mix of high channel alteration and more natural stream environment. We therefore propose an approach for risk assessing impacts arising from such complex contamination patterns, accounting for potential spatio-temporal fluctuations and presence of multiple pathways. Our study revealed substantial variations in pathway contributions and overall contaminant mass discharge to the stream. Variable contaminant contributions arising from both groundwater seepage and urban drains were identified in the channelized part of the north stream, primarily from source A. Furthermore, variations in the hyporheic and shallow groundwater flows were found to enhance contaminant transport from source B. These processes result in an increase of the overall mass of contaminant discharged, correlating with the channels' flow. Thus, an in-stream control plane approach was found to be an effective method for integrating multiple and variable discharge contributions quantitatively, although information on specific contaminant sources is lost. This study highlights the complexity and variability of contaminant fluxes occurring at the interface between groundwater and peri-urban streams, and calls for the consideration of these variations when designing monitoring programs and remedial actions for contaminated sites with the potential to impact streams. 相似文献
77.
Thiele A. Cadario E. Schulz K. Soergel U. 《Geoscience and Remote Sensing Letters, IEEE》2010,7(1):83-87
78.
Art F. White Marjorie S. Schulz Davison V. Vivit Alex E. Blum David A. Stonestrom 《Journal of Geochemical Exploration》2006,88(1-3):363
Spatial and temporal variations in pore water compositions are characterized for a deep regolith profile developed on a marine terrace chronosequence near Santa Cruz California. Variations are resolved in terms of the dominance of either a lithogenic process, i.e. chemical weathering, or a biogenic process, i.e. plant nutrient cycling. The concept of elemental fractionation is introduced describing the extent that specific elements are mobilized and cycled as a result of these processes. 相似文献
79.
80.
Stefan A. Schulz Joseph E. King Robert J. Glinski 《Monthly notices of the Royal Astronomical Society》2000,312(4):769-773
We have calculated synthetic spectra of perpendicular and parallel rovibronic bands of cumulene carbene molecules of the form C n H2 . The perpendicular bands are consistent with a regularly spaced group of diffuse interstellar bands (DIBs) near 6850 Å. Parallel bands calculated for these molecular structures are consistent with the intrinsic profile of the associated 6614-Å DIB. Both types of bands are expected for an electronic transition that these species should have at those energies. We could not determine if the molecule was charged or if an atom other than carbon terminated the chain-end. Constraints due to molecular geometry and temperature place the chain length at 7–15 carbons to fit the 6850-Å group and 9–13 carbons to fit the 6614-Å DIB. 相似文献