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Papers by Raffaele Filosa

Fibers, Feb 4, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

$Research paper thumbnail of Refractive index profiling of multimode specialty optical fibers by absorption contrast X-ray computed microtomography$

Epj Web of Conferences, Dec 31, 2022

We propose and demonstrate that absorption contrast X-ray computed microtomography is a valuable ... more We propose and demonstrate that absorption contrast X-ray computed microtomography is a valuable tool for the characterization of the optical properties of soft glass fibers.

Journal of Materials in Civil Engineering, Oct 1, 2023

The recent increase in application of Additive Manufacturing (AM) products has resulted in new de... more The recent increase in application of Additive Manufacturing (AM) products has resulted in new demands throughout the industry. Although FDMbased products are used in various fields, the mechanical properties of such products still tend to be weaker than that of the products manufactured through conventional manufacturing processes. Therefore, improving the mechanical properties of FDM-printed products is a key factor that can greatly contribute to the manufacturing industry. In this study, tensile tests are conducted on a single material specimen to analyze the influence of various experiment variables that may add up to the enhancement of the mechanical properties of 3D printed products. Additional experiments are conducted with respect to the structural arrangement and material ratio of dual material 3D printing in order to investigate the effectiveness of dual material printed products. Studies on improving such mechanical properties are expected to contribute to the enhancement of the strength for single material printed products, and provide some guidance when manufacturing dual material printed products by considering the optimum efficiency of each material.

International Journal of Fatigue, Oct 1, 2023

Two of a group of thirty coins dating between to 1st century BC and 1st century AD, found in the ... more Two of a group of thirty coins dating between to 1st century BC and 1st century AD, found in the so-called "Grotta delle Ninfe" near Cerchiara di Calabria (Calabria, Italy), and preserved in the display case of the Brettii and Enotri Museum in Cosenza (Calabria, Italy) have been under archaeometric investigation. This paper aims to understand the oxidation processes, know constituent material and find hidden signs or inscriptions on the coins by means of X-ray fluorescence (XRF) portable spectrometer and X-ray microtomography (X-ray μ-CT) in order to make the hypothetical inscriptions readable, to know the period of manufacture and their provenance. The coins collection will be analysed in future research to make the inscriptions readable and identify the coins' provenience and typology.

Journal of Luminescence, Nov 1, 2023

Optical Materials Express, Oct 4, 2022

In spite of their ubiquitous applications, the characterization of glass fibers by means of all-o... more In spite of their ubiquitous applications, the characterization of glass fibers by means of all-optical techniques is still facing some limitations. Recently, X-ray absorption has been proposed as a method for visualizing the inner structure of both standard and microstructure optical fibers. Here, we exploit X-ray absorption as nondestructive technique for the characterization of glass optical fibers. Starting from absorption contrast X-ray computed micro-tomography measurements, we obtain information about the spatial profile of the fiber refractive index at optical frequencies. We confirm the validity of our approach by comparing its results with complementary characterization techniques, based on electron spectroscopy or multiphoton microscopy.

$Research paper thumbnail of X-ray computed <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>μ</mi></mrow><annotation encoding="application/x-tex">\mu</annotation></semantics></math>μ-tomography for the characterization of optical fibers$

arXiv (Cornell University), Jun 28, 2022

In spite of their ubiquitous applications, the characterization of glass fibers by means of allop... more In spite of their ubiquitous applications, the characterization of glass fibers by means of alloptical techniques is still facing some limitations. Recently, X-ray absorption has been proposed as a method for visualizing the inner structure of both standard and microstructure optical fibers. Here, we exploit X-ray absorption as nondestructive technique for the characterization of optical glass fibers. Starting from absorption contrast X-ray computed micro-tomography measurements, we obtain information about the spatial profile of the fiber refractive index at optical frequencies. We confirm the validity of our approach by comparing its results with complementary characterization techniques, based on electron spectroscopy or multiphoton microscopy.

International Journal of Fatigue

CLEO 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

$Research paper thumbnail of X-ray tomography for the refractive index profiling of standard glass optical fibers$

Optica Advanced Photonics Congress 2022

By exploiting the absorption contrast provided by the doping of silica, we demonstrate that X-ray... more By exploiting the absorption contrast provided by the doping of silica, we demonstrate that X-ray microtomography is capable of retrieving the 3D spatial profile of standard multimode glass optical fibers.

Optical Materials Express

This work presents the results of the study of a fragment of architectural terracruda&lt... more This work presents the results of the study of a fragment of architectural terracruda sculpture from the Buddhist archaeological site of Tepe Narenj (Kabul, Afghanistan, fifth-ninth centuries CE) through X-ray micro-computed tomographic analysis. This technique offers great potential for the study of artworks that, due to their nature, condition, or relevance, are not suitable for sampling. The results have provided useful data for understanding the making of the sculpture showing for the first time the relevance of materials of plant origin used in the composition of the clay-based body, a feature that had not been previously highlighted and which appears to be crucial for proposing suitable conservation interventions.

AIP Conference Proceedings, 2019

Minerals

The obsidian of Sierra de las Navajas is well known for its green color and gold hue. In order to... more The obsidian of Sierra de las Navajas is well known for its green color and gold hue. In order to relate these features with compositional and microtextural characteristics, we have carried out a microanalytical study by Wave Dispersion System associated to Electron Probe Micro-Analyzer, Scanning Electron Microscope observation, and X-rays micro-tomographic analyses of samples showing different colors (dark to light green, sometimes with bands of different color intensity) and hues (changing, uniform, no hue). In accordance with previous studies, the green color of the obsidian seems to be related to a high iron content, probably in its reduced state. However, no significant difference in composition occurs between dark and light green samples. The SEM observation and microtomographic study revealed the absence of microcrystals and the occurrence of vesicles of different size, shape, and orientation. Lighter green colors are shown by highly vesiculated surfaces, whereas non-vesicula...