IRIS Università degli Studi dell'Aquila
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THE GROUND REACTION FORCE–TIME PROFILE OF DROP VERTICAL JUMPS: THE ACUTE EFFECT OF VERBAL INSTRUCTIONS DROPPING FROM DIFFERENT HEIGHTS
No full textA 3D-Printed Structure Approaching Low-Pass Filters for High-Frequency Applications
No full textHigh-frequency filters play a significant role in microwave applications, enabling effective signal processing, noise reduction, and frequency selection in communication, sensing, and electronic systems. This work proposes a 3D-printed passive structure based on inductive-capacitive passive filters for applications on the edge of the microwave range. The presented structure has a 900 mm2 area. Results show sufficient agreement between theoretical and measured cut-off frequencies in the 500-600 MHz range. Additionally, the 3D-printed structure shows an RC-like behavior, with sufficient impedance matching and an in-band minimum equal to -7 dBs. Finally, Insertion Loss equals -4 dB
Nascita, sviluppo e crisi dei Prati di Tivo al Gran Sasso d’Italia in Abruzzo. Analisi delle architetture e digitalizzazione dei documenti d’archivio per la preservazione e rigenerazione del patrimonio materiale e immateriale
No full textThis paper focuses on the mountain architectural heritage of Abruzzo in the second half of the twentieth century, particularly on the planned ski resorts for mass tourism. Many of these initiatives did not go beyond the project stage, others remained incomplete and almost all of them had no overall programming to control their
development and results. Prati di Tivo, a ski resort on the Gran Sasso, embodies all these factors. The incipient evolution of the 1960s, which led to the construction of ski lift and accommodation facilities on an virgin territory, came to an abrupt halt in the following decades, leaving much of the architecture in a state of abandonment.
Architectural experience is complemented, especially in the case of unfinished buildings, by archival documentation, an indispensable resource for understanding the economic and social dynamics of specific places and the architectural characteristics of this Heritage. The systematic inventory and digitisation of the often unpublished archival documentation on the design and management process of such constructions, is essential for the conscious and sustainable reuse of the built heritage, as well as for the preservation of the documents. Their inclusion in an open source digital inventory completes their potential of use and implementation
Probabilistic Assessment of the Tension-Shear Failure Domain Interaction of Angle Brackets for Timber Structures
No full textAngle brackets and hold-downs represent the typical metal fasteners in mass timber structures. Angle brackets are primarily designed to support shear forces and are generally placed near the panel's end cross-section centroid. In contrast, hold-downs are located at the panel edges to adsorb tensile and compressive forces. However, angle brackets can be subjected to axial and shear forces in the presence of boundary conditions that allow for rotation at the top of the panel. Therefore, the shear capacity of angle brackets can be compromised by the presence of a multiaxial stress state, especially under horizontal loads. In this study, the authors estimated the tension-shear failure domains for typical off-the-shelf angle brackets, taking into account the uncertainty of modeling, especially in the constitutive nail-timber interaction. The authors developed finite-element numerical models validated against experimental tests, aiming to estimate the exponents of the interaction domain while considering both modeling uncertainty and variability of the angle brackets. It was observed that the average interaction domains can be approximated as quadratic to linear domains depending on the angle bracket or nails' contribution to failure
Postapocalypse and Solarpunk in Hayao Miyazaki’s Two Versions of Nausicaä of the Valley of the Wind
No full textLe membrane tessili: un sistema integrato per migliorare le prestazioni ambientali degli edifici monumentali
No full textGiven the ambitious energy and environmental targets established by the European Union for the energy efficiency of the building stock, in the case of architectural heritage, specific strategies for energy improvement must be developed. Due to the stringent restrictions of preservation norms, the energy retrofit of monumental buildings must be evaluated on a case-by-case basis, considering the historical and artistic value of the structure and implementing solutions that preserve its architectural integrity. This study focuses on the integration of textile membranes as building component in the cultural heritage. A state-of-the-art study was conducted and the main types of integration interventions were analysed and classified according to the type of building component, highlighting the gap in the literature regarding the impact on the environmental performance of the structure as a whole. The results show that the contribution of this lightweight, compatible and reversible membrane systems to the energy improvement of listed buildings needs to be studied in depth
Four‐Peak Structure on Equatorial Ionization Anomaly Crests During the May 2024 Geomagnetic Storms
Get PDFThis study investigates the four-peak electron density structure in the Equatorial Ionization Anomaly (EIA) during the intense geomagnetic storms of 10–20 May 2024, utilizing dayside data at ∼500 km from the China Seismo-Electromagnetic Satellite (CSES-01). Observations revealed distinct four peaks in latitudinal profiles of electron density, symmetrically distributed across both hemispheres. Particularly, the poleward crests can expand beyond ±30° quasi-dipole latitude during the 10 May superstorm. To reveal the potential driver of such unique EIA structure, statistical analysis is conducted on 35 CSES-01 orbits which identified the four-peak phenomenon. The enhanced equatorial electrojet activity, inferred from the scalar magnetic field residuals, indicates that the four-peak morphology is likely related to the prompt penetration electric field (PPEF). Superposed epoch analysis also highlighted that intensification of the mean SuperMAG |SML| index preceded the onset of four-peak structures by ∼20 min, whereas the mean eastward equatorial electric field, derived from an empirical model of the interplanetary electric field driven penetration, exhibits no statistically significant enhancement, implying that substorm-associated PPEF may be the primary driver of this type of EIA structure. This study advances understanding of EIA variability under extreme space weather conditions and the findings underscore the critical role of magnetosphere-ionosphere coupling via substorm-driven electric fields in reshaping storm-time ionospheric plasma distribution
MANILA: A Low-Code Application to Benchmark Machine Learning Models and Fairness-Enhancing Methods
Get PDFThis paper presents MANILA, a web-based low-code application to benchmark machine learning models and fairness-enhancing methods and select the one achieving the best fairness and effectiveness trade-off. It is grounded on an Extended Feature Model that models a general fairness benchmarking workflow as a Software Product Line. The constraints defined among the features guide users in creating experiments that do not lead to execution errors. We describe the architecture and implementation of MANILA and evaluate it in terms of expressiveness and correctness
