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171.
Retrospective selection bias (or the benefit of hindsight) 总被引:2,自引:0,他引:2
Francesco Mulargia 《Geophysical Journal International》2001,146(2):489-496
172.
Guido Gonzato Francesco Mulargia & Warner Marzocchi 《Geophysical Journal International》1998,132(2):275-282
173.
Prof. P. Francesco Saverio Zanon 《Pure and Applied Geophysics》1942,4(1):152-170
Riassunto Vengono esposti i caratteri delle variazioni di temperatura della superficie della sabbia al Lido di Venezia, desunti dalle osservazioni del tredicennio 1929–1941, per le quali si procede ad opportuni confronti con i dati dell'attinometro del Violle relativi al medesimo periodo.
Zusammenfassung Die Eigenschaften der Temperatur-änderungen der Sandoberfläche auf dem Strand vom Lido in Venedig werden angegeben und untersucht, gestüzt auf den Beobachtungen der 13 Jahre 1929–1941, welche mit den Ergebnissen der Strahlungsmessungen mit einem Violle-Aktinometer in derselben Periode verglichen und erlätert sind.相似文献
174.
Warming permafrost in European mountains 总被引:3,自引:0,他引:3
Charles Harris Daniel Vonder Mühll Ketil Isaksen Wilfried Haeberli Johan Ludvig Sollid Lorenz King Per Holmlund Francesco Dramis Mauro Guglielmin David Palacios 《Global and Planetary Change》2003,39(3-4):215-225
Here we present the first systematic measurements of European mountain permafrost temperatures from a latitudinal transect of six boreholes extending from the Alps, through Scandinavia to Svalbard. Boreholes were drilled in bedrock to depths of at least 100 m between May 1998 and September 2000. Geothermal profiles provide evidence for regional-scale secular warming, since all are nonlinear, with near-surface warm-side temperature deviations from the deeper thermal gradient. Topographic effects lead to variability between Alpine sites. First approximation estimates, based on curvature within the borehole thermal profiles, indicate a maximum ground surface warming of +1 °C in Svalbard, considered to relate to thermal changes in the last 100 years. In addition, a 15-year time series of thermal data from the 58-m-deep Murtèl–Corvatsch permafrost borehole in Switzerland, drilled in creeping frozen ice-rich rock debris, shows an overall warming trend, but with high-amplitude interannual fluctuations that reflect early winter snow cover more strongly than air temperatures. Thus interpretation of the deeper borehole thermal histories must clearly take account of the potential effects of changing snow cover in addition to atmospheric temperatures. 相似文献
175.
Natural Hazards - Rainfall thresholds for landslides occurrence derived in real applications tend to be lower than the ones one would obtain using exact data. This letter shows how the use of... 相似文献
176.
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178.
Davide Lenaz Henrik Skogby Francesco Princivalle Ulf Hålenius 《Physics and Chemistry of Minerals》2006,33(7):465-474
The influence on the spinel structure of Fe3+ → Cr substitution was studied in flux-grown synthetic single crystals of the magnesiochromite–magnesioferrite (MgCr2O4–MgFe2O4) solid solution series. Samples were analysed by single-crystal X-ray diffraction, electron microprobe analyses, optical absorption and Mössbauer spectroscopy. With the exception of iron-poor samples (3–12 mol-% MgFe2O4), optical absorption and Mössbauer spectra show that iron occurs almost exclusively as trivalent Fe in the present samples. A very intense and broad absorption band at ca 7,800 cm?1 dominates the optical absorption spectra of samples with higher Fe-contents. The appearance of this band is related to a distinct structural disorder of Fe3+ and a development of magnetic ordering as demonstrated by Mössbauer spectra. Profound composition-related changes are observed in the Mössbauer spectra, which are magnetically unsplit in the range 2–41 mol-% magnesioferrite, but become magnetically split in the range 59–100 mol-% magnesioferrite. Structural parameters a 0 and M–O increase with magnesioferrite content and inversion degree, while u and T–O decrease. Our study confirms the previously reported (Lavina et al. 2002) influence of Fe3+ at the M site on T–O bond lengths in the spinel structure. 相似文献
179.
180.
Acta Geotechnica - The assessment of the time evolution of the impact force exerted by dry flowing masses on rigid obstacles is mandatory for the dynamic design of sheltering structures and the... 相似文献