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Emanuele Piuzzi, Erika Pittella, Stefano Pisa, Andrea Cataldo, Egidio De Benedetto, Giuseppe Cannazza
Noninvasive Patch Resonator-Based Measurements on Cultural Heritage Materials

In this work, a noninvasive microwave-based system for monitoring water content in stone materials used in Cultural Heritage structures is presented. By placing a planar resonator in contact with the considered stone sample, through reflection scattering parameter measurements, it is possible to associate the resonant frequency of the resonator to the moisture content of the stone sample. In this way, an experimental relationship between resonant frequency and moisture content can be obtained. Experimental tests are carried out on two types of materials, namely gentile and carparo stones: which are typically found in Cultural Heritage structures in Southern Italy and they are particularly affected by deterioration and decay phenomena. Measurements were performed for five levels of water content of the stone samples, and the empirical relationship between each considered level of water content and the corresponding measured quantity were derived. The obtained results demonstrate that this solution appears robust.

Fabio Leccese, Marco Cagnetti, Simonetta Tuti, Pietro Gabriele, Eduardo De Francesco, Rada Durović-Pejčev, Alessandro Pecora
Modified LEACH for Necropolis Scenario

A modified version of LEACH routing protocol has been implemented and simulated in Castalia simulator to verify if it was good to manage a WSN dedicated for necropolis. Simulation results seem to show the valence of our idea.

Paolo D'Atanasio, Alessandro Zambotti, Stefano Pisa, Erika Pittella, Emanuele Piuzzi
Complex Permittivity Measurements for Moisture and Salinity Characterization of Building Materials

In this paper, preliminary results of complex permittivity measurements of clay-brick material will be presented. The general aim of the experimental project is to correlate the measured permittivity of construction materials with the content of water and salt, in order to obtain information on the condition of ancient walls by using non-invasive techniques. The complex permittivity values reported in this paper have been obtained by waveguide measurements on samples of clay-brick dried and then immersed in demineralized water or in a saturated solution of demineralized water and NaCl.

Fabio Mangini, Lorenzo Dinia, Fabrizio Frezza, Andrea Beccarini, Mauro Del Muto, Enrico Federici, Stefano Godi, Andrea Segneri
New crack measurement methodology: Tag Recognition

In this paper, a new methodology for measuring the cracking for the Structural Health Monitoring (SHM) of cultural heritage, is presented. This methodology is characterized by being minimally invasive on the artifact to preserve, which is one of the main qualities required in this field. The approach used is to determine the relative distance between two optical tags, using advanced fitting algorithms for the objective function. In this work, we have taken into account different objective-function kinds, in order to find the best configuration to determine the fitting parameters, useful to the SHM. In order to validate the fitting algorithms, some measurements evaluated on simulated tags are presented. Moreover, to validate the methodology, some real measurements are shown.

Michele Caponero, Rosaria D'Amato, Andrea Polimadei, Gaetano Terranova
Development of FBG humidity sensors for stone condition monitoring

Novel relative humidity (RH) sensors, based on fibre Bragg gratings (FBGs) technology, have been fabricated using different moisture-sensitive materials, namely agar, poly(vinylalcohol) and poly(ethyleneoxide), on the fiber sensor. The sensor is specifically intended to monitor stones of cultural heritage buildings and monuments, in particular for being positionedunder hydrophobic coatings used for protecting stones from absorption of water and dissolved chemicals, thus providing early warning of coating deterioration by RH monitoring. The feature of the prototypes was first tested exposing the sensors in controlled environment and then assessed by simulated 'in-the-field' operating conditions, with sensors installed in a marble block. Experimental results are presented and discussed.

Ivan Roselli, Angelo Tatì, Vincenzo Fioriti, Irene Bellagamba, Marialuisa Mongelli, Mariarosaria Barbera, Marina Magnani Cinetti, Roberto Romano, Gerardo De Canio
Non-destructive tests for structural diagnosis of the so-called Temple of Minerva Medica, Rome

The structural diagnosis of historic buildings should integrate on-site and in-thelaboratory experimental testing techniques, with no harmful effects on the structural and aesthetic health of the monument. In the present paper several nondestructive tests (NDTs) were conducted to study an archeological ruined building located in Rome, the socalled Temple of Minerva Medica. In particular, the experimental program comprised 3D geometric surveys by laser scanning and stereophotogrammetry, thermal imaging, microclimatic parameters acquisition, sonic testing and ambient vibration monitoring. The above NDTs were executed from summer of 2016 until summer of 2017, in order to investigate the seasonal effects and/or the eventual changes in the structural response of the building, after the 2016-2017 Central Italy seismic sequence. The acquired data were stored in a repository that is available to the end-users for future studies and analyses.

Barone Fabrizio, Giordano Gerardo
Low frequency sensitive tiltmeters for dynamic structural status evaluation of hystorical monuments

The dynamic structural analysis of historical monuments for health evaluation and long term preservation requires a long term acquisition of linear and angular displacements, mainly in the low frequency region (<< 1Hz), that has to face to many technical problems spanning from the problem of uncoupling displacements from tilts, to cost and size of instrumentation. To overcome this problem, we developed an innovative small and light linear and angular sensor, based on the Folded Pendulum Model, perfectly suitable for a permanent non-invasive low-power monitoring of historical monuments. In this paper, after a description of the tiltmeter model and performances, we focus the attention to its application to historical monuments monitoring.

Maria Danese, Maria Sileo, Nicola Masini
Geographic multidimensional approach for decay analysis of Gymnasium frescoes in Pompeii. Preliminary results

The monitoring of the state of conservation of frescoes is still nowadays a crucial problem in the field of cultural heritage protection. With this aim, in the last years non-invasive diagnostics techniques have been introduced. However, even if they are widely considered an essential tool for knowledge, diagnostics for conservation is still struggling to establish itself in the operational practice. This is due to several reasons, including the still high costs, the difficulty of processing and interpretation of the acquired data, the lack of recognized operating protocols. In particular, from the point of view of processing, the integration of different techniques returns a very large dataset, where it is not easy to extract multi-temporal and spatial patterns that could tell us valuable information about the state of conservation of the analyzed fresco. Visual analytics methodology is an useful help for pattern extraction in large datasets. In this work a wall of the Gymnasium of the Sarno Baths (located in Regio VIII) have been studied with the following non-invasive techniques: - Structure-from-motion photogrammetry (SfM) - GPR survey - Multitemporal Infrared Thermography (MIRT). Preliminary results of the integration of SfM, GPR and MIRT enabled to provide information on the decay pathologies of frescoes. In this paper in particular, preliminary results of the GPR analysis with the geovisual analytics approach are showed, with the aim to facilitate the identification and interpretation of decay patterns of the Gymnasium's fresco.

S. Fontul, M. Solla, H. Cruz, J. S. Machado, L. Pajewski
A GPR Survey of the Floor of the São Carlos Theater (Lisbon, Portugal)

This paper describes a study conducted by LNEC to assess the health and safety conditions of the floor of the Noble Hall of the National Theater of São Carlos. In a multidisciplinary approach, an extensive field work was carried out, involving the identification of type and location of floor beams in the various areas of the floor using a Ground Penetrating Radar (GPR), local inspection openings to visually assess the geometry, timber species and conservation state of structural members at those points and assessment of the conservation state of timber beam ends, using drilling equipment. The tests performed are referred herein, the potentiality of using GPR, the results obtained with ground- and air- coupled antennas are analyzed and recommendations are made.

A. E. Bonomo, G. Prosser, G. Rizzo, M. Sileo
Degradation diagnosis on Gravina Calcarenite: classification and damage indexes on the Sassi di Matera site (Southern Italy)

In Matera, the 2019 Culture Capital and UNESCO site, the Pleistocene Gravina Calcarenite is the main natural stone used to build. This gives a unique aspect to the ancient part of the town called Sassi. It's an awesome example of a rock-cut settlement where architecture is fit to the geological features. Unfortunately, constructions are currently in a deteriorated state and it is possible to see on the 'calcareous tuffs' several degradation morphologies. This work analyses the connection between geological features and alteration patterns in order to obtain useful informations to preserve historical building during the time. A detailed classification of the decay forms, based on a newly defined damage index, has been obtained after investigation of 100 façades considering different types of Calcarenites and evidences obtained on the surface. For each degradation morphology a specific decay degree is defined in relation with evidences on the surface of the façades. In addition, a detailed analysis of stones of the San Pietro Barisano church allowed obtaining information on structural, compositional and textural features of Calcarenite, and the related degradation morphologies.

Page 264 of 977 Results 2631 - 2640 of 9762