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1.
Cristiano B. Cosmovici Vojko Bratina Gottfried Schwarz Gianpaolo Tozzi Michael J. Mumma Roberto Stalio 《Astrophysics and Space Science》2006,301(1-4):135-143
We report here on unique post-perihelion (2.3 AU) measurements of Comet Hale-Bopp in the FUV-range (950–1250 Å) by means of the UVSTAR spectrometer from the space shuttle with the main purpose of searching for argon and other FUV emitters. New methods for separating the strong airglow emission at shuttle altitudes are here discussed in detail. Due to our low resolution (15 Å) and S/N ratio the possible rocket-borne detection of argon near perihelion (0.9 AU) could not be confirmed. New species as N2 are suspected but difficult to separate from the strong airglow emission at shuttle altitudes. From the Lyα brightness (1.30± 0.08 kRy) a water production rate Q = 5.9 ± 0.4 × 1029 molecules s?1 could be derived and compared with other post-perihelion observations. 相似文献
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Gottfried Huber-Pestalozzi 《Aquatic Sciences - Research Across Boundaries》1961,23(1):285-289
Ohne Zusammenfassung 相似文献
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Gottfried Kneuper 《International Journal of Earth Sciences》1955,44(1):376-390
Zusammenfassung Die Spateisensteingänge von Grube Georg wurden in einem Spätstadium der Faltung gebildet. Es sind Diagonalscherflächen, die im Bereich einer Achsenflexur aufrissen und an denen Abschiebungen stattfanden. Ihnen entsprechen weitere, nicht vererzte Abschiebungen.Nach der Gangbildung, aber noch während der Faltung, entstanden parallel den Faltenachsen jüngere Scherflächen (vorwiegend Überschiebungen).Jünger als die Faltenbildung sind gangversetzende, NE-streichende Seitenverschiebungen. 相似文献
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Mean bulk densities of various samples of dry atmospheric aerosol particles sampled at different sites and during different seasons and weather situations range between 1.8 and more than 3 gm cm3. 相似文献
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We discuss the feasibility of using the coherent electric field in crystal as a means for gamma-ray astronomy. At 100 GeV, pair production is enhanced along the crystalline axis. However, the expected celestial gamma-ray flux at this energy is insufficient for this technique to be viable with a conventional-size satellite detector. 相似文献
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Amin R. Nehrir Christoph Kiemle Mathew D. Lebsock Gottfried Kirchengast Stefan A. Buehler Ulrich Löhnert Cong-Liang Liu Peter C. Hargrave Maria Barrera-Verdejo David M. Winker 《Surveys in Geophysics》2017,38(6):1445-1482
A deeper understanding of how clouds will respond to a warming climate is one of the outstanding challenges in climate science. Uncertainties in the response of clouds, and particularly shallow clouds, have been identified as the dominant source of the discrepancy in model estimates of equilibrium climate sensitivity. As the community gains a deeper understanding of the many processes involved, there is a growing appreciation of the critical role played by fluctuations in water vapor and the coupling of water vapor and atmospheric circulations. Reduction of uncertainties in cloud-climate feedbacks and convection initiation as well as improved understanding of processes governing these effects will result from profiling of water vapor in the lower troposphere with improved accuracy and vertical resolution compared to existing airborne and space-based measurements. This paper highlights new technologies and improved measurement approaches for measuring lower tropospheric water vapor and their expected added value to current observations. Those include differential absorption lidar and radar, microwave occultation between low-Earth orbiters, and hyperspectral microwave remote sensing. Each methodology is briefly explained, and measurement capabilities as well as the current technological readiness for aircraft and satellite implementation are specified. Potential synergies between the technologies are discussed, actual examples hereof are given, and future perspectives are explored. Based on technical maturity and the foreseen near-mid-term development path of the various discussed measurement approaches, we find that improved measurements of water vapor throughout the troposphere would greatly benefit from the combination of differential absorption lidar focusing on the lower troposphere with passive remote sensors constraining the upper-tropospheric humidity. 相似文献
10.
Gottfried Grünthal Dietrich Stromeyer Christian Bosse Fabrice Cotton Dino Bindi 《Bulletin of Earthquake Engineering》2018,16(10):4339-4395
The basic seismic load parameters for the upcoming national design regulation for DIN EN 1998-1/NA result from the reassessment of the seismic hazard supported by the German Institution for Civil Engineering (DIBt). This 2016 version of the national seismic hazard assessment for Germany is based on a comprehensive involvement of all accessible uncertainties in models and parameters and includes the provision of a rational framework for integrating ranges of epistemic uncertainties and aleatory variabilities in a comprehensive and transparent way. The developed seismic hazard model incorporates significant improvements over previous versions. It is based on updated and extended databases, it includes robust methods to evolve sets of models representing epistemic uncertainties, and a selection of the latest generation of ground motion prediction equations. The new earthquake model is presented here, which consists of a logic tree with 4040 end branches and essential innovations employed for a realistic approach. The output specifications were designed according to the user oriented needs as suggested by two review teams supervising the entire project. Seismic load parameters, for rock conditions of \(v_{S30}\) = 800 m/s, are calculated for three hazard levels (10, 5 and 2% probability of occurrence or exceedance within 50 years) and delivered in the form of uniform hazard spectra, within the spectral period range 0.02–3 s, and seismic hazard maps for peak ground acceleration, spectral response accelerations and for macroseismic intensities. Results are supplied as the mean, the median and the 84th percentile. A broad analysis of resulting uncertainties of calculated seismic load parameters is included. The stability of the hazard maps with respect to previous versions and the cross-border comparison is emphasized. 相似文献