Search results for "Dam"
showing 10 items of 3828 documents
Study of fatigue behavior of plant fiber reinforced composites : taking into account the variability of properties
2012
The present study focuses on the characterization and comparison of the quasi-static and fatigue properties of flax and glass fibre reinforced composites with an epoxy matrix. An extensive experimental campaign of fatigue tests have been performed using the measured quasi-static tension and in plane-shear properties. It appears that the static and fatigue characteristics of the glass/epoxy composites are higher than that of flax/epoxy ones with similar fibre volume fraction and lay-ups. However, due to the low density of flax reinforcements, the differences between the specific properties of the two materials are low. The measurement of the evolution of the fatigue properties has highlighte…
Optimization of Passive Constrained Layer Damping (Pcld) Treatments for Vibration Reduction
2015
An efficient method to reduce the frequency averaged transverse vibration level of aplate by optimizing the position of attached passive constrained layer damping PCLD is presented.This method uses a multilayer anisotropic plate model which is an equivalent single layer platemodel (ESL) where transverse shear stresses and displacements are continuous at each layer’sinterfaces. Hence, for a laminate composed of an arbitrary number of layers, all the quantities arerelated to those of the first layer. The optimization process is based on the use of the ESL platemodel combined with the genetic algorithm (GA) and Latin Hypercube Sampling (LHS) algorithmimplemented in a Rayleigh-Ritz resolution p…
IDENTIFICATION OF THE VISCOELASTIC CONSTITUTIVE EQUATIONS OF FLAX FIBREREINFORCED LAMINATESBY VIBRATION ANALYSIS
2015
International audience; Experimental and numericalapproaches to identify the viscoelastic properties of flax fibrereinforced epoxy composite laminatesare proposed in this study. The method used consisted theidentification of the evolutions of both loss factor and stiffness through the use of the frequency responses. Several free-free symmetrically guided beams were excited on the dynamic range of 10 to 4000 Hz with a swept sine excitation focused around their first’s modes. A fractional derivative Zener model was used to predict the behaviourof on-axis ply complex moduli. The modified ply constitutive law was then implemented in Classical Lamination Theory (CLT) calculation routine. The pro…
“IN INGHILTERRA LA GIUSTIZIA È APERTA A TUTTI, COME L’HOTEL RITZ”. E IN ITALIA?
2015
L’aumento continuo e progressivo del contributo unificato in materia di appalti pubblici al vaglio della Corte di giustizia: le conclusioni dell'Avvocato generale.
DNA damage response at telomeres boosts the transcription of SARS-CoV-2 receptor ACE2 during aging
2021
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes the coronavirus disease 2019 (COVID-19), known to be more common in the elderly, who also show more severe symptoms and are at higher risk of hospitalization and death. Here, we show that the expression of the angiotensin converting enzyme 2 (ACE2), the SARS-CoV-2 cell receptor, increases during aging in mouse and human lungs. ACE2 expression increases upon telomere shortening or dysfunction in both cultured mammalian cells and in vivo in mice. This increase is controlled at the transcriptional level, and Ace2 promoter activity is DNA damage response (DDR)-dependent. Both pharmacological global DDR inhibition of ATM kin…
Considerazioni sull’ammissibilità delle leggi- provvedimento: il caso del finanziamento del Teatro Eliseo al vaglio della Corte costituzionale
2021
This paper examins the admissibility of so-called “leggi-provvedimento”, taking the cue from the effect of the national legislative provision, which recognizes eight million euro for biennium 2017-2018 to the Roman Teatro Eliseo, and which was recently submitted to the Italian Constitutional Court. This essay examins the responsibility of national legislature for adopting damaging legislative measure.
¿Qué dicen los adolescentes sobre el acoso escolar?
2019
Resumen: Todos los actos antisociales, incluidos la violencia y el acoso escolar, lo son dentro de la colectividad en la que se producen y son reflejo de esa colectividad. Este estudio se centra en el discurso espontáneo de 406 adolescentes entre 15 y 21 años sobre el acoso escolar. El análisis cualitativo de los datos permite inferir cuatro principios discursivos que se articulan desde la inicial negación de la violencia (“eso no pasa”), a la negación de la responsabilidad (“si pasa, no soy yo, somos todos”), la negación de la gravedad (“si es broma, no hace daño), y la atribución a la víctima (el acoso tiene más que ver con la víctima que con el agresor). El análisis del discurso espontán…
(Un)framing Lampedusa: Regimes of Visibility and the Politics of Affect in Italian Media Representations
2017
The 3rd of October 2013 more than 300 migrants died after a boat sank off the coasts of Lampedusa. This probably was the most dramatic shipwreck ever happened in the Mediterranean, and certainly the one which attracted the most media attention in Italy and elsewhere. Since at least 1992 the Mediterranean has become the unstable ground where the dominant policies of regulated mobility and discontinuous surveillance are continuously challenged by bodies which struggle for their fundamental right to move. This conflict between global regimes of disciplined mobility (Philo 2014) and singular forms of embodied resistance (Agamben 1990) involves also the field of representation and its forcible e…
Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) differ in their suitability as hosts for the endangered freshwater pearl mussel (Margari…
2017
1. European populations of the freshwater pearl mussel (FPM, Margaritifera margaritifera) have widely collapsed, and despite many types of conservation actions the number of successful restoration trials has remained limited. The goal of this study was to find new aspects for the conservation by investigating whether there are population-specific differences in suitability of Atlantic salmon (Salmo salar) and brown trout (S. trutta) as the hosts for the parasitic glochidium larvae of FPM, depending probably on the historical occurrence of these salmonid species in FPM habitats. 2. We studied the potential host specificity both in the field and in laboratory by exposing salmonid fish to FPM …
Alkylated Aromatic Thioethers with Aggregation‐Induced Emission Properties—Assembly and Photophysics
2019
In this contribution, we present the synthesis and self-assembly of alkylated thioethers with interesting photophysical properties. To this end, the emission, absorption and excitation spectra in organic solvents and as aggregates in water were measured as well as the corresponding photoluminescence quantum yields and lifetimes. The aggregates in aqueous media were visualized and measured using transmission electron microscopy. Besides that, crystal structures of selected compounds allowed a detailed discussion of the structure–property relationship. Furthermore, the mesomorphic behavior was investigated using polarized optical microscopy (POM) as well as differential scanning calorimetry (…