Search results for "walls"

Turbulence structure and coherent motion in a straight laboratory flume

2012

Experimental investigation on mansory panels manufactured with pumice lightweight concrete

2010

The possibility of using pumice aggregates for concrete in structural applications is discussed. In particular, the mix design of lightweight concrete for the manufacturing masonry units having proper strength, is discussed. Moreover, the design of the unit shape according to the technical code requirements and making it possible to arrange reinforcing steel bars is described. Reinforced bearing masonry walls, made with the concrete units in question, were manufactured and tests on the panels and on the designed units were carried out. For comparison, tests on concrete units and structural elements were carried out after the substitution of pumice aggregates with ordinary lightweight aggreg…

Numerical Modelling for Assessing the Structural Efficiency of CAM® Reinforcement System for Masonry Walls

2022

A large portion of the Italian building heritage is made of masonry construc-tions, which were erected in the first decades of the last century and were conceived to support gravitational loads only. Many research activities have been carried out in order to propose retrofitting techniques aimed at improving seismic behaviour of existing ma-sonry buildings. The present paper focuses on the CAM® reinforcing system. Such a retrofitting technique, which is widely used in Italy, consists in the application of pre-tensioned stainless steel ribbons on existing masonry walls, conferring to them addi-tional strength, ductility and beneficial confinement effects. The preliminary outcomes of a common…

The Architecture of the Limit. The recovery of the southern Agrigento's historical walls.

2012

The fourteenth-century Agrigento's walls was interested by strong interventions during last century that led to the present image. In this critical place there are no project, no order, no logic, everything is left to chance. The ambitious target of the project was to give an order to this self caused chaos, to this route that should show the lost historical memory. The project aimed to reshape the urban area through zero-volume interventions and to make manifest the peculiarities of this territory trough small gestures, creating sequences of recognizable places that are able to express sense and identity of the urban space. The most significant intervention is designed for a doubling of th…

Can biomechanical analysis shed some light on aneurysmal pathophysiology? Preliminary study on ex vivo cerebral arterial walls

2019

Abstract Background The pathophysiology of cerebral aneurysm is complex and poorly understood, and it can have the most catastrophic clinical presentation. Flow dynamics is a key player in the initiation and progression of aneurysm. Better understanding the interaction between hemodynamic loading and biomechanical wall responses can help to add the missing piece on aneurysmal pathophysiology. In this laboratory study we aimed to analyze the effect of the application of a mechanical force to cerebral arterial walls. Methods Displacement control tests were performed on five porcine cerebral arteries. The test machine was the T150 Nanotensile. The stiffness variation with the increment of the …

Halaesa Arconidea (Tusa, Messina). Primi risultati dagli scavi delle fortificazioni, settore nord-est.

2023

This report describes the activities and results of two years of archaeological excavations carried out by the University of Palermo at the site of Halaesa, in northern Sicily. The excavations revealed the structure of the ancient city walls (maybe built in two different phases, during the Late Hellenistic/Early Roman peri-od) and the presence of a tank close to the wall, connected to the defense sistem.

Experimental analysis of a thermoactive underground railway station

2022

Little is known about the real energy potential of thermoactive underground infrastructures, such as railway stations, that can act as a heating/cooling provider for the built environment. This study presents the results of thermomechanical full-scale in situ testing and numerical analysis of a thermoactive underground train station. The thermal performance and related geostructural impact of a portion of the new underground energy infrastructure (UEI) installed at the Lancy-Bachet train station in Geneva (Switzerland) are analyzed. Heating and cooling tests simulating real operative geothermal conditions are considered. Particular attention is given to ((i) the monitored wall-tunnel hydrot…

La letteratura italiana racconta la caduta del muro di Berlino

2020

The fall of the wall is an event that sets a date and raises a symbolic watershed that separates the before from the after. The essay analyzes the Italian literary texts that were directly confronted with the events of 1989 by reviewing a period of time that goes from the day after the fall of the wall to the present day. From Fortini to Volponi, from Giudici to Arbasino, up to Lagioia, Affinati and Camilleri: for these writers talking about the Berlin Wall means reflecting on the crisis of ideologies, on the contradictions of history, on the relationship between literature and reality.

Constraints on Cosmic Strings Using Data from the Third Advanced LIGO–Virgo Observing Run

2021

We search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 data set. Search results are presented for gravitational waves produced by cosmic string loop features such as cusps, kinks and, for the first time, kink-kink collisions.cA template-based search for short-duration transient signals does not yield a detection. We also use the stochastic gravitational-wave background energy density upper limits derived from the O3 data to constrain the cosmic string tension, $G\mu$, as a function of the number of kinks, or the number of cusps, for two cosmic string loop distribution models.cAdditionally, we develop and test a third model which interpolat…

Spin torques and magnetic texture dynamics driven by the supercurrent in superconductor/ferromagnet structures

2018

We introduce the general formalism to describe spin torques induced by the supercurrents injected from the adjacent superconducting electrodes into the spin-textured ferromagnets. By considering the adiabatic limit for the equal-spin superconducting correlations in the ferromagnet we show that the supercurrent can generate both the field-like spin transfer torque and the spin-orbital torque. These dissipationless spin torques are expressed through the current-induced corrections to the effective field derived from the system energy. The general formalism is applied to show that the supercurrent can either shift or move the magnetic domain walls depending on their structure and the type of s…