IMEKO Event Proceedings

Page 782 of 855 Results 7811 - 7820 of 8545

Antonio Cavallaro
The use of Cone Penetration Tests (CPT) for the study of the dynamic characteristics of the soils

This paper describes and compares the results of in situ investigations performed on two Sicilian test sites: Augusta Saline (SR) and Catania STM M6 areas. The studies were carried out to determine the variation of shear modulus with depth by Cone Penetration Tests (CPT), Standard Penetration Tests (SPT), Down - Hole Tests (DHT), Seismic Dilatometer Marchetti Tests (SDMT). The available data also enabled one to compare the shear modulus profile obtained by empirical correlations based on CPT and SPT with Down - Hole Test and Seismic Dilatometer Marchetti Test.

Coccia E., Volpe M. G., Varricchio E., Paolucci M.
The use of FTIR spectroscopy to assess polyphenols induced changes in the biochemical composition of fish tissues

In the last few years, Fourier transform infrared (FTIR) spectroscopy has significantly advanced in biological research. This has been due to recent progress in the use of chemometrics, such as partial least square (PLS) analysis or principal component analysis (PCA) for the extraction of reliable information even from highly complex FTIR spectroscopy spectra. In comparison to conventional chemical analyses, FTIR spectroscopy has striking advantages due to the high reliability, sensitivity, and the speed of measurement procedure.
Here we present some preliminary data on the use of Fourier transform infrared (FTIR) spectroscopy to analyze the trout digestive system exposed in vitro to hydroxytyrolsol from olive pulp. Statistical analyses on FTIR spectra allowed the comparison of global effects of the hydroxytyrosol and evidenced some common or different features in the cell perturbations among digestive system tracts. Interestingly, marked metabolic changes induced by polyphenols were identified. Furthermore, many metabolic changes could be detected as early as after 15 minutes incubation with the polyphenol.

Salvatore Lorefice, Elena Amico di Meane, Michela Sega
THE USE OF GC-MS TO SUPPORT STABILITY ASSESSMENT OF DENSITY REFERENCE LIQUIDS

Density measurements are frequently associated to specific requirements in order to evaluate the quality of a process or to determine mass and/or volume of the material. Certified reference liquids can be used to assure metrological traceability of density measurements to the International System of Units (SI) with uncertainty lower than 0.005 %. This paper presents the new approach of the Italian Istituto Nazionale di Ricerca Metrologica (INRIM) to set density standards.
The procedure involved accurate density determinations of some liquid samples, to be used as references, on which in addition analysis by means of gas-chromatography coupled with mass spectrometry (GC-MS) was performed to support homogeneity and short-term stability. In this exercise GC-MS analyses on two chlorinated liquids (namely tetrachloroethylene and trichloroethylene) were carried out before and after density measurements. The results obtained with the two different techniques were encouraging. Samples that had undergone to variations in density value showed also different gas-chromatographic profiles. In the same time, samples that had not undergone to density variations kept similar gas-chromatographic profiles. The results support the approach of combining independent methods in order to set physico-chemical properties of reference materials (RM), univocally.

P. Cennamo, N. Pasquino, A. Moretti
The use of high-frequency electromagnetic radiation to remove biofilms from canvas

A methodology based on pulsed electromagnetic radiation in an unlicensed radiofrequency band is proposed to eliminate biodeteriogens from biofilms encrusting canvas of artistic interest. Molecular techniques allowed to identify species of bacteria and microfungi in the biofilms. Experimental results showed that the area covered by biofilm disappeared after exposure over five days.

Luciano Picarelli, Emilia Damiano, Aldo Minardo, Lucio Olivares, Luigi Zeni
The use of optical fibres for early prediction of slope failure

Landsliding is the macroscopic effect of the slope failure; however, it is only the final stage of an often long-lasting process of soil deformation. In many cases, slope movement remains extremely slow and undetected for a very long time; in other cases, failure is abrupt, preceded by only small deformations and followed by fast and destructive movements. The detection and interpretation of pre-failure deformations and the precise definition of the unstable area are of paramount importance for risk mitigation. To this aim, optical fibres can represent a new and efficient tool.

V. S.Cunha, J. C. Andrade, R. V. Leal
THE USE OF PROFICIENCY TESTING SCHEMES FOR AUTOMOTIVE EXHAUST EMISSIONS LABORATORY

In this work the Proficiency Testing Scheme (PTScheme) had been used for evaluation of performance of the laboratories of automotive emissions to measure the levels of emissions of the vehicles, supplying subsidies to the laboratories in order to identify and solve analytical problems and contributing for the harmonization of the results of the measurements in the country. The PTScheme of automotive emissions is a type of study, provided only in Brazil and it can be concluded that the results have been satisfactory and of great importance for the industry, society and environment. In this work is presented a comparison of results for the four rounds held covering the period from 2004 to 2010.

Paulo R. M. Silva, Valnei S. Cunha, Werickson F. C. Rocha, Gabriel F. Sarmanho, Joyce C. Andrade, Marcello Depieri
THE USE OF PROFICIENCY TESTING SCHEMES FOR MOTORCYCLE EXHAUST EMISSIONS LABORATORY

In this work the Proficiency Testing Scheme (PTScheme) has been used for evaluation of the laboratories of motorcycle emissions to measure the emission levels of this kind of vehicles, supplying subsidies to the laboratories to identify and solve analytical problems and contributing for the measurement harmonization in the country. The PTScheme of automotive emissions is a type of study, provided only in Brazil and it was the first time that this procedure was carried out for motorcycles. Such proficiency test showed satisfactory results and show the importance for the industry, society and environment.

O. Yu. Bushuev
THE USE OF PRONY'S METHOD TO DETECT CHANGES IN THE TECHNICAL CONDITION OF A PRESSURE TRANSDUCER

The use of Prony’s method to detect changes in the technical condition of a pressure transducer is described. The technique is based on spectral analysis of transducer output signal and estimating its frequency response by Prony’s method. Ways to increase the accuracy of Prony’s method have been proposed and algorithm for transducer output signal processing based on modified Prony’s method is presented.

Jakub Wagner, Roman Z. Morawski
THE USE OF SINGULAR VALUE DECOMPOSITION OF MATRICES FOR EXTRACTION OF SIGNALS FROM RADAR DATA

The research reported in this paper is related to the ultra-wide-band radar technology that may be employed in care services for elderly people. Four methods, based on singular value decomposition of matrices, designed for extraction of useful signals from clutter-corrupted data, acquired by means of an ultra-wide-band radar sensor, have been compared. The uncertainty of estimation of echo parameters, performed using the extracted signals, has been used as the criterion of comparison.

Carlos Almeida Santos, C. Oliveira Costa, Helena Geirinhas Ramos
THE USE OF SMART SENSORS FOR TESTS OF LOADED CONCRETE PILES

A lot of geotechnical engineering problems can be analysed in situ with tests of horizontal and vertical loaded piles. These are required, for instance, to study the behaviour of piles isolated and in groups. Based on the emergent concept of "smart sensor" a unit was developed that converts the deformation of the concrete pile measured by an LVDT on digital information. This unit is integrated on a local area network supervised by a command unit located at the surface. The communication protocol is based on a master-slave structure supported by dedicated developed commands.

Page 782 of 855 Results 7811 - 7820 of 8545