The imprint of the equation of state on the axial w-modes of oscillating neutron stars     

Omar Benhar  Emanuele Berti  Valeria Ferrari 《Monthly notices of the Royal Astronomical Society》1999,310(3):797-803

We discuss the dependence of the pulsation frequencies of the axial quasi-normal modes of a non-rotating neutron star upon the equation of state describing the star interior. The continued fraction method has been used to compute the complex frequencies for a set of equations of state based on different physical assumptions and spanning a wide range of stiffness. The numerical results show that axial gravitational waves carry relevant information on both the structure of neutron star matter and the nature of the hadronic interactions.  相似文献   

LITH5.0: a revised crustal model for Canada based on Lithoprobe results     

H. K. C. Perry  D. W. S. Eaton  A. M. Forte 《Geophysical Journal International》2002,150(1):285-294

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Open issues on the synthesis of evolved stellar populations at ultraviolet wavelengths     

Miguel Chavez  Emanuele Bertone 《Astrophysics and Space Science》2011,332(1):193-199

This paper deals with five-dimensional black hole solutions in (a) Einstein-Maxwell-Gauss-Bonnet theory with a cosmological constant and (b) Einstein-Yang-Mills-Gauss-Bonnet theory for spherically symmetric space time. In both the cases the possibility of phase transition is examined and it is analyzed whether the phase transition is a Hawking-Page type phase transition or not.  相似文献   

Statistical properties of the <Emphasis Type="Italic">GALEX</Emphasis> spectroscopic stellar sample     

Emanuele Bertone  Miguel Chavez 《Astrophysics and Space Science》2011,335(1):69-76

The GALEX General Data Release 4/5 includes 174 spectroscopic tiles, obtained from slitless grism observations, for a total of more than 60 000 ultraviolet spectra. We have determined statistical properties of the sample of GALEX stars. We have defined a suitable system of spectroscopic indices, which measure the main mid-UV features at the GALEX low spectral resolution and we have employed it to determine the atmospheric parameters of stars in the range 4500≲T _eff≲9000 K. Our preliminary results indicate that the majority of the sample is formed by main sequence F- and G-type stars, with metallicity [M/H]≳−1 dex.  相似文献   

Upper-mantle thermochemical structure below North America from seismic–geodynamic flow models     

H. K. C. Perry  A. M. Forte  D. W. S. Eaton 《Geophysical Journal International》2003,154(2):279-299

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Interacting Winds in Eclipsing Symbiotic Systems – The Case Study of EG Andromedae     

Emanuele Calabrò 《Journal of Astrophysics and Astronomy》2014,35(1):69-85

We report the mathematical representation of the so called eccentric eclipse model, whose numerical solutions can be used to obtain the physical parameters of a quiescent eclipsing symbiotic system. Indeed the nebular region produced by the collision of the stellar winds should be shifted to the orbital axis because of the orbital motion of the system. This mechanism is not negligible, and it led us to modify the classical concept of an eclipse. The orbital elements obtained from spectroscopy and photometry of the symbiotic EG Andromedae were used to test the eccentric eclipse model. Consistent values for the unknown orbital elements of this symbiotic were obtained. The physical parameters are in agreement with those obtained by means of other simulations for this system.  相似文献   

Response of transient rock uplift and base level knickpoints to erosional efficiency contrasts in bedrock streams     

Joshua A. Wolpert  Adam M. Forte 《地球表面变化过程与地形》2021,46(10):2092-2109

Knickpoints in bedrock streams are often interpreted as transient features generated by a change in boundary conditions. It is typically assumed that knickpoints propagate upstream with constant vertical velocities, though this relies on a stream being in erosional steady state (erosion rate equals rock uplift rate) prior to the knickpoint's formation. Recent modeling and field studies suggest that along-stream contrasts in rock erodibility perturb streams from erosional steady state. To evaluate how contrasts in rock erodibility might impact knickpoint interpretations, we test parameter space (rock erodibility, rock contact dip angle, change in rock uplift rate) in a one-dimensional (1D) bedrock stream model that has variable rock erodibility and produces a knickpoint with a sudden change in rock uplift rate. Upstream of a rock contact, the vertical velocity of a knickpoint generated by a change in rock uplift rate is strongly correlated with how the rock contact has previously perturbed erosion rates. These knickpoints increase vertical velocity upon propagating upstream of a hard over soft contact and decrease vertical velocity upon propagating upstream of a soft over hard contact. However, interactions with other transient perturbations produced by rock contacts make for nuances in knickpoint behavior. Rock contacts also influence the geometry of knickpoints, which can become particularly difficult to identify upstream of soft over hard rock contacts. Using our simulations, we demonstrate how a contact's along-stream horizontal migration rate and cross-contact change in rock strength control how much an upstream reach is perturbed from erosional steady state. When simulations include multiple contacts, the knickpoint is particularly prone to colliding with other transient perturbations and can even disappear altogether if rock contact dips are sufficiently shallow. Caution should be taken when analyzing stream profiles in areas with significant changes in rock strength, especially when rock contact dip angles are near the stream's slope.  相似文献   

Event Scenario Analysis for the Design of Rockslide Countermeasures   总被引：2，自引：0，他引：2  

GIGLI Giovanni  INTRIERI Emanuele  LOMBARDI Luca  NOCENTINI Massimiliano  FRODELLA William  BALDUCCI Marco  VENANTI Luca Domenico  CASAGLI Nicola 《山地科学学报》2014,(6):1521-1530

The Torgiovannetto quarry（Assisi municipality,central Italy） is an example of a site where the natural equilibrium was altered by human activity,causing current slope instability phenomena which threaten two roadways important for the local transportation.The quarry front,having a height of about 140 m,is affected by a 182,000 m3 rockslide developed in intensely fractured limestone and is too large to be stabilized.In 2003 some tension cracks were detected in the vegetated area above the quarry upper sector.From then on,several monitoring campaigns were carried out by means of different instrumentations（topographic total station,extensometers,inclinometers,ground-based interferometric radar,laser scanner and infrared thermal camera）,allowing researchers to accurately define the landslide area and volume.The latter’s major displacements are localized in the eastern sector.The deformational field appears to be related to the seasonal rainfall.The landslide hazard associated with the worst case scenario was evaluated in terms of magnitude,intensity and triggering mechanism.For the definition of the possible runout process the DAN 3D code was employed.The simulation results were used in order to design and construct a retaining embankment.Furthermore,in order to preserve both the safety of the personnelinvolved in its realization and of the roadways users,an early warning system was implemented.The early warning system is based on daily-averaged displacement velocity thresholds.The alarm level is reached if the prediction based on the methods of Saito（1969） and Fukuzono（1985） forecasts an imminent rupture.  相似文献   

Texture Attribute Analysis of GPR Data for Archaeological Prospection     

Wenke Zhao  Emanuele Forte  Michele Pipan 《Pure and Applied Geophysics》2016,173(8):2737-2751

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Evaluation of Internal Structure,Volume and Mass of Glacial Bodies by Integrated LiDAR and Ground Penetrating Radar Surveys: The Case Study of Canin Eastern Glacieret (Julian Alps,Italy)     

R. R. Colucci  E. Forte  C. Boccali  M. Dossi  L. Lanza  M. Pipan  M. Guglielmin 《Surveys in Geophysics》2015,36(2):231-252

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