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Acta Geotechnica - Slope stability in reservoirs depends on time-dependent triggering factors such as fluctuations of the groundwater level and precipitation. This paper assesses the stability of... 相似文献
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Carlotta Bonoli 《Astrophysics and Space Science》1985,110(2):311-319
Two different methods for restoring digital data are compared from the point of view of the astronomical application. The results obtained for the same sets of spectroscopic data, both simulated and experimentally observed, are discussed. 相似文献
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Rossella Baldacconi Frine Cardone Caterina Longo Maria Mercurio Carlotta Nonnis Marzano Elda Gaino Giuseppe Corriero 《Marine Ecology》2010,31(2):309-317
The present study focuses on the reproductive success of transplants of the bath sponge Spongia officinalis Linnaeus, 1759, with the aim of investigating the possibility of restocking this species, one of the most endangered organisms of the Mediterranean sessile zoobenthos. Transplants of S. officinalis, collected from a wild population along the Apulian coasts (Ionian Sea, Italy), have been moved into an area where the species was present in the past. The transplants consisted both of specimens in toto and of fragments of different sizes, obtained after having cut the mother sponge into pieces. All transplanted sponges showed complete cicatrisation of the cut surfaces within a month of the initial manipulation and had a survival rate of 100% throughout the 12 months of the study. From the present investigation, it has emerged that the reproductive effort and the larval release by the transplants do not differ significantly from those shown by the source population. This successful technical approach supports its application as a strategy for restocking the population of this endangered species. 相似文献
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Stephen Serjeant † Alberto Carramiñana † Eduardo Gonzáles-Solares Phillipe Héraudeau Raúl Mújica † Ismael Perez-Fournon Nicola Sedgwick † Michael Rowan-Robinson Alberto Franceschini Thomas Babbedge Carlos del Burgo Paolo Ciliegi reas Efstathiou Fabio La Franca Carlotta Gruppioni David Hughes Carlo Lari Seb Oliver Francesca Pozzi Manfred Stickel Mattia Vaccari 《Monthly notices of the Royal Astronomical Society》2004,355(3):813-818
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C. Gruppioni F. Pozzi G. Zamorani P. Ciliegi C. Lari E. Calabrese F. La Franca I. Matute 《Monthly notices of the Royal Astronomical Society》2003,341(1):L1-L6
The radio counterparts to the 15-μm sources in the European Large Area ISO Survey southern fields are identified in 1.4-GHz maps down to ∼80 μJy. The radio–mid-infrared correlation is investigated and derived for the first time at these flux densities for a sample of this size. Our results show that radio and mid-infrared (MIR) luminosities correlate almost as well as radio and far-infrared (FIR), at least up to z ≃ 0.6 . Using the derived relation and its spread together with the observed 15-μm counts, we have estimated the expected contribution of the 15-μm extragalactic populations to the radio source counts and the role of MIR starburst galaxies in the well-known 1.4-GHz source excess observed at sub-mJy levels. Our analysis demonstrates that IR emitting starburst galaxies do not contribute significantly to the 1.4-GHz counts for strong sources, but start to become a significant fraction of the radio source population at flux densities ≲0.5–0.8 mJy. They are expected to be responsible for more than 60 per cent of the observed radio counts at ≲0.05 mJy. These results are in agreement with the existing results on optical identifications of faint radio sources. 相似文献
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V. D'Elia E. Branchini F. La Franca V. Baccetti I. Matute F. Pozzi C. Gruppioni 《Monthly notices of the Royal Astronomical Society》2005,359(3):1077-1082
We investigate the clustering properties of galaxies in the recently completed ELAIS-S1 redshift survey through their spatial two-point autocorrelation function. We used a subsample of the ELAIS-S1 catalogue covering approximately 4 deg2 and consisting of 148 objects selected at 15 μm with a flux >0.5 mJy and a redshift z < 0.5 . We detected a positive signal in the correlation function that in the range of separations 1–10 h −1 Mpc is well approximated by a power law with a slope γ= 1.4 ± 0.25 and a correlation length s 0 = 5.4 ± 1.2 h −1 Mpc , at the 90 per cent significance level. This result is in good agreement with the redshift-space correlation function measured in more local samples of mid-infrared-selected galaxies such as the IRAS Point Source Catalog (PSC z ) redshift survey. This suggests a lack of significant clustering evolution of infrared-selected objects out to z = 0.5 that is further confirmed by the consistency found between the correlation functions measured in a local ( z < 0.2) and a distant (0.2 < z < 0.5) subsample of ELAIS-S1 galaxies. We also confirm that optically selected galaxies in the local redshift surveys, especially those of the SDSS sample, are significantly more clustered than infrared objects. 相似文献
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Stephen Serjeant Seb Oliver † Michael Rowan-Robinson Hans Crockett Vasilis Missoulis Tim Sumner Carlotta Gruppioni Robert G. Mann Nick Eaton David Elbaz David L. Clements Amanda Baker reas Efstathiou Catherine Cesarsky Luigi Danese Alberto Franceschini Reinhardt Genzel y Lawrence Dietrich Lemke Richard G. McMahon George Miley Jean-Loup Puget Brigitte Rocca-Volmerange 《Monthly notices of the Royal Astronomical Society》2000,316(4):768-778
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S. Serjeant A. Efstathiou S. Oliver C. Surace P. Héraudeau M. J. D. Linden-Vørnle C. Gruppioni F. La Franca D. Rigopoulou T. Morel H. Crockett T. Sumner M. Rowan-Robinson M. Graham 《Monthly notices of the Royal Astronomical Society》2001,322(2):262-268
We present the luminosity function of 90-μm-selected galaxies from the European Large Area ISO Survey (ELAIS), extending to z =0.3. Their luminosities are in the range 109 65 −2 L /L⊙ <1012 , i.e. non-ultraluminous. From our sample of 37 reliably detected galaxies in the ELAIS S1 region from the Efstathiou et al. S 90 100 mJy data base, we have found optical, 15-μm or 1.4-GHz identifications for 24 (65 per cent). We have obtained 2dF and UK Schmidt FLAIR spectroscopy of 89 per cent of identifications to rigid multivariate flux limits. We construct a luminosity function assuming that (i) our spectroscopic subset is an unbiased sparse sample, and (ii) there are no galaxies that would not be represented in our spectroscopic sample at any redshift. We argue that we can be confident of both assumptions. We find that the luminosity function is well described by the local 100-μm luminosity function of Rowan-Robinson, Helou & Walker. Assuming this local normalization, we derive luminosity evolution of (1+ z )2.45±0.85 (95 per cent confidence). We argue that star formation dominates the bolometric luminosities of these galaxies, and we derive comoving star formation rates in broad agreement with the Flores et al. and Rowan-Robinson et al. mid-infrared-based estimates. 相似文献