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51.
Geoff Mann 《Geoforum》2009,40(3):335-344
This paper investigates some aspects of political ecology’s relation to Marxism, specifically its ties to Marxism’s “historical materialism”. I argue Gramsci is an essential feature in the reinvigoration of that relation, and that political ecology should be Marxist, if by Marxist we mean Gramscian. I focus on the concept of hegemony, arguing that Gramsci’s historical materialism, in contrast to the Engelsian tradition within which most materialism is snared, allows us to take account of both moments in Gramsci’s hegemony, the “economic” and the “ethicopolitical”. 相似文献
52.
Vishnu Reddy Juan A. Sanchez Andreas Nathues Nicholas A. Moskovitz Jian-Yang Li Edward A. Cloutis Ken Archer Roy A. Tucker Michael J. Gaffey J. Paul Mann Holger Sierks Ulrich Schade 《Icarus》2012,217(1):153-168
Phase angle and temperature are two important parameters that affect the photometric and spectral behavior of planetary surfaces in telescopic and spacecraft data. We have derived photometric and spectral phase functions for the Asteroid 4 Vesta, the first target of the Dawn mission, using ground-based telescopes operating at visible and near-infrared wavelengths (0.4–2.5 μm). Photometric lightcurve observations of Vesta were conducted on 15 nights at a phase angle range of 3.8–25.7° using duplicates of the seven narrowband Dawn Framing Camera filters (0.4–1.0 μm). Rotationally resolved visible (0.4–0.7 μm) and near-IR spectral observations (0.7–2.5 μm) were obtained on four nights over a similar phase angle range. Our Vesta photometric observations suggest the phase slope is between 0.019 and 0.029 mag/deg. The G parameter ranges from 0.22 to 0.37 consistent with previous results (e.g., Lagerkvist, C.-I., Magnusson, P., Williams, I.P., Buontempo, M.E., Argyle, R.W., Morrison, L.V. [1992]. Astron. Astrophys. Suppl. Ser. 94, 43–71; Piironen, J., Magnusson, P., Lagerkvist, C.-I., Williams, I.P., Buontempo, M.E., Morrison, L.V. [1997]. Astron. Astrophys. Suppl. Ser. 121, 489–497; Hasegawa, S. et al. [2009]. Lunar Planet. Sci. 40. ID 1503) within the uncertainty. We found that in the phase angle range of 0° < α ? 25° for every 10° increase in phase angle Vesta’s visible slope (0.5–0.7 μm) increases 20%, Band I and Band II depths increase 2.35% and 1.5% respectively, and the BAR value increase 0.30. Phase angle spectral measurements of the eucrite Moama in the lab show a decrease in Band I and Band II depths and BAR from the lowest phase angle 13° to 30°, followed by possible small increases up to 90°, and then a dramatic drop between 90° and 120° phase angle. Temperature-induced spectral effects shift the Band I and II centers of the pyroxene bands to longer wavelengths with increasing temperature. We have derived new correction equations using a temperature series (80–400 K) of HED meteorite spectra that will enable interpretation of telescopic and spacecraft spectral data using laboratory calibrations at room temperature (300 K). 相似文献
53.
Pinto Viter Magalhães Massonne Hans-Joachim Wildner Wilson Hartmann Léo Afraneo Debruyne David Theye Thomas 《Mineralogy and Petrology》2019,113(6):765-782
Mineralogy and Petrology - Mafic-ultramafic intrusions within continental flood basalt terrains are frequently associated with Cu-Ni-PGE mineralization. This study aims to constrain the... 相似文献
54.
Hans-Joachim Elster 《Aquatic Sciences - Research Across Boundaries》1949,11(3-4):352-360
Zusammenfassung Erh?ht man die Intensit?t der Befischung in einem Gew?sser, so steigt der durchschnittliche Fangertrag nicht im selben Verh?ltnis,
sondern um so langsamer, je h?her die Befischungsintensit?t schon vorher war. Diese Beziehungen werden mathematisch formuliert.
Es werden Tabellen aufgestellt, die den neuen Befischungskoeffizienten in Abh?ngigkeit vom alten und die ?nderung des Ertrages
pro Fischer bzw. pro Befischungseinheit nach dem Wechsel der Befischungsintensit?t zu berechnen gestatten. Schlie?lich werden
die einschr?nkenden Bedingungen besprochen, unter denen diese theoretischen Beziehungen in der Praxis angewendet werden k?nnen.
Summary By increasing the intensity of fishing in a lake the average catch will not increase in the same ratio, but the slower the higher the intensity of fishing has been before. These relations are brought to a mathematical formula. Tabels are made which allow to compute the new coefficient of fishing depending on the old and the change of the catch per fisherman, resp. per unity of fishery after the changing of the intensity of fishing. After all one is treating the restrictive conditions by which these theoretical relations may be employed in practice. Die Arbeit wurde Herrn Oberregierungsrat Dr. F.Lücke, Direktor des Instituts für Fischverarbeitung in Hamburg-Altona, zum 60. Geburtstag gewidmet.相似文献
55.
P. de Caritat P. T. Main E. C. Grunsky A. W. Mann 《Australian Journal of Earth Sciences》2017,64(8):1033-1043
Understanding the character of Australia's extensive regolith cover is crucial to the continuing success of mineral exploration. We hypothesise that the regolith contains geochemical fingerprints of processes related to the development and preservation of mineral systems at a range of scales. We test this hypothesis by analysing the composition of surface sediments within greenfield regional-scale (southern Thomson Orogen) and continental-scale (Australia) study areas. In the southern Thomson Orogen area, the first principal component (PC1) derived in our study [Ca, Sr, Cu, Mg, Au and Mo at one end; rare earth elements (REEs) and Th at the other] is very similar to the empirical vector used by a local company (enrichment in Sr, Ca and Au concomitant with depletion in REEs) to successfully site exploration drill holes for Cu–Au mineralisation. Mapping of the spatial distribution of PC1 in the region reveals several areas of elevated values and possible mineralisation potential. One of the strongest targets in the PC1 map is located between Brewarrina and Bourke in northern New South Wales. Here, exploration drilling has intersected porphyry Cu–Au mineralisation with up to 1 wt% Cu, 0.1 g/t Au, and 717 ppm Zn. The analysis of a comparable geochemical dataset at the continental scale yields a compositionally similar PC1 (Ca, Sr, Mg, Cu, Au and Mo at one end; REEs and Th at the other) to that of the regional study. Mapping PC1 at the continental scale shows patterns that (1) are spatially compatible with the regional study and (2) reveal several geological regions of elevated values, possibly suggesting an enhanced potential for porphyry Cu–Au mineralisation. These include well-endowed mineral provinces such as the Curnamona and Capricorn regions, but also some greenfield regions such as the Albany-Fraser/western Eucla, western Murray and Eromanga geological regions. We conclude that the geochemical composition of Australia's regolith may hold critical information pertaining to mineralisation within/beneath it. 相似文献
56.
57.
Hans-Joachim Bürkner 《GeoJournal》2000,50(2-3):105-108
Migration flows from western Europe, the United States and Canada to east central Europe have received little attention so
far. But numbers are now considerable and in the context of globalisation it seems appropriate to conceptualise communities
of Westerners in terms of transnational social spaces as defined by Glick Schiller et al. Study of Americans in Prague reveals
three main groups: enterprise managers, lifestyle migrants and entrepreneurs in small and medium-sized enterprises. All are
engaged in a variety of different processes of community-building, often with clear trends towards a new transnationalism.
Yet, the individual attempt to live in two societies is limited by the marked boundaries of the communities and by the degree
of social exclusion which they experience from the majority population.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
58.
Abhijit Chougule Jakob Mann Mark Kelly Gunner C. Larsen 《Boundary-Layer Meteorology》2018,167(3):371-397
A spectral-tensor model of non-neutral, atmospheric-boundary-layer turbulence is evaluated using Eulerian statistics from single-point measurements of the wind speed and temperature at heights up to 100 m, assuming constant vertical gradients of mean wind speed and temperature. The model has been previously described in terms of the dissipation rate \(\epsilon \), the length scale of energy-containing eddies \(\mathcal {L}\), a turbulence anisotropy parameter \(\varGamma \), the Richardson number Ri, and the normalized rate of destruction of temperature variance \(\eta _\theta \equiv \epsilon _\theta /\epsilon \). Here, the latter two parameters are collapsed into a single atmospheric stability parameter z / L using Monin–Obukhov similarity theory, where z is the height above the Earth’s surface, and L is the Obukhov length corresponding to \(\{Ri,\eta _\theta \}\). Model outputs of the one-dimensional velocity spectra, as well as cospectra of the streamwise and/or vertical velocity components, and/or temperature, and cross-spectra for the spatial separation of all three velocity components and temperature, are compared with measurements. As a function of the four model parameters, spectra and cospectra are reproduced quite well, but horizontal temperature fluxes are slightly underestimated in stable conditions. In moderately unstable stratification, our model reproduces spectra only up to a scale \(\sim \) 1 km. The model also overestimates coherences for vertical separations, but is less severe in unstable than in stable cases. 相似文献
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