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201.
Laurent Eyer Lovro Palaversa Nami Mowlavi Pierre Dubath Richard I. Anderson Dafydd W. Evans Thomas Lebzelter Vincenzo Ripepi Laszlo Szabados Silvio Leccia 《Astrophysics and Space Science》2012,341(1):207-214
The ESA Gaia mission will bring a new era to the domain of standard candles. Progresses in this domain will be achieved thanks to unprecedented astrometric precision, whole-sky coverage and the combination of photometric, spectrophotometric and spectroscopic measurements. The fundamental outcome of the mission will be the Gaia catalogue produced by the Gaia Data Analysis and Processing Consortium (DPAC), which will contain a variable source classification and specific properties for stars of specific variability types. We review what will be produced for Cepheids, RR Lyrae, Long Period Variable stars and eclipsing binaries. 相似文献
202.
Alberto De Bonis Celestino Grifa Giuseppe Cultrone Pantaleone De Vita Alessio Langella Vincenzo Morra 《Geoarchaeology》2013,28(5):478-503
We performed petrophysical analyses on 34 clayey samples of different geological origin within the Campania region of Italy in order to determine possible sources of raw materials used to produce ancient pottery. Possible raw material sources can be grouped into high‐CaO clays (HCC) and low‐CaO clays (LCC). HCC are mainly represented by more recent (Miocene‐Pleistocene) basinal sediments whereas LCC tend to be associated with basinal, alluvial, and pyroclastic deposits. A chemical comparison between clayey raw materials, modern ceramic replicas, and Campanian archaeological ceramics of several typologies (common ware, cooking ware, fine tableware, amphorae, and bricks) from 8th century B.C. to the Middle Ages (a total of 350 ceramic samples) indicates that HCC were extensively used for common wares and that these were either mixed with temper or levigated. In contrast, most of the LCC were used for the production of cookware. We also analyzed the technological potential of the sampled raw materials, taking into consideration their actual and possible uses. We observed that most HCC deposits were well suited for tableware and amphorae, whereas LCC were better for cookware and some fine tableware. 相似文献
203.
Glauco Bonardi Paola de Capoa Angelida Di Staso Vincenzo Perrone Maurizio Sonnino Mario Tramontana 《地学学报》2005,17(4):331-337
A stratigraphic revision of the Paludi Formation, cropping out in Northern Calabria on the north-eastern side of Sila Massif, has confirmed that it has been deposited between two main tectonic phases. Actually the formation is involved only by top to the north-east thrusts, different from those separating the crystalline and ophiolitic nappes of Northern Calabria, and rests unconformably on the Sila Unit, the uppermost nappe of the tectonic stack. In the frame of the interpretation of Northern Calabria as a fragment of the Alps, the Paludi Formation play the role of a deposit post-dating the eo-alpine tectonic phases and pre-dating the Apenninic orogenic transport. Therefore the Aquitanian age of the formation, obtained by nannofloras analyses, can be considered the minimum age to the Apulia-verging orogenic transport, witnessed by top to north-east thrusts. It fairly corresponds to the age referred to the Lucanian ocean closure. 相似文献
204.
Seismology of the solar atmosphere 总被引:1,自引:0,他引:1
Wolfgang Finsterle Stuart M. Jefferies Alessandro Cacciani Paolo Rapex Cynthia Giebink Allister Knox Vincenzo DiMartino 《Solar physics》2004,220(2):317-331
We describe a new instrument for seismically probing the properties of the Sun's lower atmosphere, and present some first
results from an observational campaign carried out at the geographic South Pole during the austral summer of 2002/2003. A
preliminary analysis of the data (simultaneous, high-cadence observations of the velocity signals from the photosphere and
low chromosphere) shows that the well-known suppression of acoustic power in regions of strong magnetic field, and enhancement
of high-frequency power around active regions (acoustic halos), are both consistent with a spreading out of the magnetic field
lines with increasing height in the atmosphere. The data have also revealed some unexpected wave behavior. First, evanescent-like
waves are found at frequencies substantially above the acoustic cut-off frequency in regions of intermediate magnetic field.
Second, upward- and downward-propagating waves are detected in areas of strong magnetic field such as sunspots and plage:
even at frequencies below the acoustic cut-off frequency. Third, the wave behavior in regions of strong magnetic field can
change over periods of a few hours from propagating to evanescent. While we have no concrete explanation for the first two
results, the latter result opens up the question of whether sound waves are involved in short-term events such as flares or
CME's. 相似文献
205.
Abstract A two-dimensional Boussinesq ocean model has been used to investigate the effect of intermediate-level thermal and saline anomalies on the known multiple equilibria structure of the thermohaline circulation. These anomalies are taken as a crude representation of the Mediterranean outflow in the Atlantic Ocean. The associated perturbation drives the system towards an overturning which resembles the present average Atlantic thermohaline circulation. The sensitivity to the depth at which the anomaly is placed is also investigated. We found that near-surface anomalies are more efficient in affecting the structure of the equilibria. 相似文献
206.
We perform an optical characterization of UV laser ablated silicates (olivine, pyroxene), starting from their reflectance spectra in the 0.3-2.5 μm spectral range. The goal is to provide useful tools to model space weathering effects on surfaces of asteroids and TNOs (trans-neptunian objects). We determine that the reddening and darkening spectral trend is compatible with the Hapke's space weathering model, using the optical constants of metallic iron in a silicate matrix. This result is supported by new magnetic susceptibility measurements on laser ablated orthopyroxene. We also investigate the potential contribution of formation of amorphous silicates in the process. Applying our results to silicate-rich surfaces in the Solar System, we investigate the possibility of a weathered olivine component on the surface of Centaur 5145 Pholus. Inclusion of this component slightly decreases the amount of complex organics and water ice from those previously estimated. Thus, the current Pholus spectrum is consistent with the presence of either unweathered or weathered olivine, or potentially both materials. 相似文献
207.
L. Picarelli L. Olivares L. Comegna E. Damiano 《Rock Mechanics and Rock Engineering》2008,41(1):179-197
Summary Experience shows that slope movements occurring in similar geomorphogical contexts may display very different styles and magnitude.
This has important practical implications, since the risk associated with a landslide depends just on its magnitude. The paper
discusses the mechanics of slope failure in coarse-grained and in fine-grained soils with particular reference to flow-like
landslides, showing that even small details can affect their movement pattern.
Author’s address: Prof. Luciano Picarelli, Seconda Università di Napoli, Aversa, Italy 相似文献
208.
209.
210.
Rapid estimation of ground-shaking maps for seismic emergency management in the Campania Region of southern Italy 总被引:1,自引:1,他引:0
Vincenzo Convertito Raffaella De Matteis Luciana Cantore Aldo Zollo Giovanni Iannaccone Mauro Caccavale 《Natural Hazards》2010,52(1):97-115
Strong ground-shaking mapping soon after a moderate-to-large earthquake is crucial to recognize the areas that have suffered
the largest damage and losses. These maps have a fundamental role for emergency services, loss estimation and planning of
emergency actions by the Civil Protection Authorities. This is particularly important for areas with high seismic risk levels,
such as the Campania-Lucania Region in southern Italy. Taking advantage of the Irpinia Seismic Network (ISNet), a recently
installed dense and wide dynamic seismic network, we have developed a procedure for rapid estimation of ground-shaking maps
after moderate-to-large earthquakes (GRSmap). This uses an optimal data gridding scheme designed to account for bi-dimensional
features of strong ground-motion fields, such as directivity, radiation patterns and focal mechanisms, to which most damage
can be correlated. The basis of the mapping technique is a triangulation procedure to locally correct predicted data at the
triangle barycentres where their vertices correspond to seismic stations. The method has been tested off-line using a simulated
M 6.6 earthquake located at the centre of ISNet and applied to data of the 23 November 1980 Irpina M 6.9 earthquake recorded by a sparse network. This has highlighted its ability to predict peak ground-motion parameters of
large magnitude earthquakes with respect to the attenuation relationships. 相似文献