1,720,967 research outputs found
Dynamic control of historical buildings through interferometric radar technique: an useful approach for Structural Health Monitoring on earthquake damaged structures.” 32nd national meeting “GNGTS 2013”, Tema 3: Geofisica applicata, 19-21 November 2013, Trieste, Italy; pp. 101-106;
No full textVibration analysis of historic bell towers by means of contact and remote sensing measurements
No full textThe dynamic behaviour of two slender structures with very similar geometry has been investigated in order to evaluate the role played by the construction materials; the comparison has thus been conducted on their vibration properties as resonance frequencies, damping coefficients and mode shapes. The studied structures are two bell towers of a church which were built in two different historical times, with an interval of about one century, using different construction techniques and materials. The experimental tests were carried out by means of output-only measurements of ambient vibration using both contact and non-contact techniques. The signals have been acquired using a tri-directional tromometer or two short period seismometers, both placed in prearranged station points on the structures. Furthermore, the vibrations of the structures have also been measured with the IBIS-S microwave interferometer which is able to provide submillimetric displacements along the radar Line Of Sight without need of any contact with the surface. Therefore, the experimental dynamic response of the church-towers system has been estimated integrating both velocity and displacement data. Though the vibration of the structures had low magnitude, both surveys allowed us to identify the main linear dynamic properties of the structures. Based on these passive surveys, a linear finite element model was calibrated in order to confirm the relationship between the materials and vibration properties. The final model has been locally validated by means of in situ acoustic measurements
Geophysical methods applied to the study of landslides and to the assessment of the shallow slopes instability: the case of Villacidro - South-Sardinia (Italy).
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Geophysical methods (seismic and electrical) applied to the study of landslides and to assessment the shallow slopes instability: the case of Villacidro – South- Sardinia (Italy)
No full textAnalysis of the stability variation of a slope crossed by forest fire
No full textThis paper deals the study of the stability variation of a hill slope crossed by a forest fire. In order to perform the
stability analyses, two geotechnical models were derived by the integration of the results of geotechnical surveys
(NSPT measurements and direct shear tests) with electrical resistivity tomographies. Classical approach based on Limit
Equilibrium Method is used to determine the safety coefficient. Furthermore, the effects of the forest fire on the slope
stability have been discussed modifying the 2D models and introducing an ultra-shallow thin layer with the shear strength
parameters determined on burned soil samples, collected after the fire crossing. In particular, this analysis has shown a
marked reduction of safety factor at the interface between the burned soil layer and the underlying material for both
geotechnical models, considering the infiniy, Fire Efte slope method with several saturation conditions of the shallow layer
Non-destructive methods and GIS technologies for spatial planning strategies in mining areas
No full textThe focus of the paper is on the relationship between conservation and spatial planning in mining areas, where visual characters and underground activities shape the territory. The research about the evolution of mining landscapes enables to recognize the value of the architectonic and environmental heritage in the world of today and tomorrow. Non-destructive technologies can play a key role in order to develop correct planning actions, both horizontally within local organizations and also within the different tiers of government. The district of Bacu Abis (Carbonia) in south-western Sardinia (Italy) has been investigated in order to find ancient-modern connections between the mining exploitation and its urban development across the last two centuries. The analysis has been focused on the possibility of integrating historical information with results of field surveys in order to support spatial planning strategies
Interferometric radar applications for the monitoring of vibrations of cultural heritage buildings and comparison with 3D velocimeter measurements
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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