Search results for "Ferro"

The environmental impact of noise from roads and highways traffic is relevant in urban and rural areas. The use of open-graded asphalt pavements reduces significantly the noise, entrapping the acoustic waves inside the porous structure of the material. In this paper we propose a simulation approach in order to predict the acoustic properties of the asphalt mixture from geometrical and topological indicators. In detail we have generated, using a Random Sequential Adsorption model, synthetic samples starting from the same grading and bitumen contents of real samples manufactured in laboratory. We have measured the acoustic adsorption coefficient of the real samples and we have investigated th…

open graded asphalt mixture tire/pavement noise absorption coefficient random sequential adsorption noise reductionSettore ICAR/04 - Strade Ferrovie Ed Aeroporti

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Assessing the Open Trenches in Screening Railway Ground-Borne Vibrations by Means of Artificial Neural Network

2009

Reducing ground borne vibrations in urban areas is a very challenging task in railway transportation. Many mitigation measures can be considered and applied; among these open trenches are very effective. This paper deals with the study of the effect, in terms of reduction of vertical and horizontal displacements and velocities, of the open trenches. 2D FEM simulations have been performed and several open trench configurations have been analysed varying the main geometric features such as width and depth, distance from the rail, thickness of the soil layer over the rigid bedrock, type of the ground, ratio between the depth of the trench, and the thickness of the soil layer. For quantifying t…

open trencheEngineeringgeographygeography.geographical_feature_categoryAcoustics and UltrasonicsArtificial neural networkArticle Subjectbusiness.industryBedrockRailwaylcsh:QC221-246Railway transportationground-borne vibrationBuilding and ConstructionStructural engineeringVibrationMechanics of MaterialsTrenchlcsh:Acoustics. SoundSettore ICAR/04 - Strade Ferrovie Ed AeroportiGeotechnical engineeringbusinessReduction (mathematics)artificial neural networkFem simulationsAdvances in Acoustics and Vibration

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New charge transfer salts of two organic π-donors of the tetrathiafulvalene type with the paramagnetic [Cr(NCS)6]3- anion

2003

cited By 9; International audience; The electrochemical combination of the paramagnetic anion [Cr(NCS)6]3- with the organic π-donors bis(ethylenedithio)tetrathiafulvalene (ET) and 4,5-bis(2-hydroxyethylthio) -4′,5′-ethylenedithiotetrathiafulvalene (DHET-EDTTTF) leads to two new radical cation salts, namely (ET)4 [Cr(NCS 6]·PhCN 1 and (DHET-EDTTTF)2 (NEt4)[Cr(NCS)6] 2. Both have been characterized by X-ray crystallography, magnetic and resistivity measurements. The structure of 1 consists of alternating inorganic layers generated by the anions and organic layers in which the PhCN molecules are inserted; the organic sub-lattice is built up from four different ET units, three of them with a ch…

organic compoundStereochemistryGeneral Chemical EngineeringDimerCrystal structure010402 general chemistry01 natural scienceschromium derivativeParamagnetismchemistry.chemical_compoundtetrathiafulvalene derivativeMolecule[CHIM]Chemical Sciencescontrolled studyradical010405 organic chemistryferromagnetic materialarticleCharge densityGeneral ChemistryanionX ray crystallographysemiconductordimerMagnetic susceptibility0104 chemical sciencescationinorganic compoundCrystallographyRadical ionchemistryelectrochemistrymagnetismchemical structureroom temperatureTetrathiafulvaleneconductanceenergy

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Un algoritmo PSO per l’ottimizzazione planimetrica dei tracciati stradali

2013

Questo studio propone un algoritmo di ricerca basato sulla tecnica di Intelligenza Artificiale di tipo Swarm (Particle Swarm Optimization - PSO) che consente di ottimizzare la geometria dei tracciati stradali, minimizzando una particolare funzione di costo che tiene conto di voci condizionanti la geometria del tracciato e di penalità relative ai vincoli presenti nel territorio. La pianificazione e la progettazione di un tracciato stradale costituiscono fasi intense di studio, fondamentali per garantire la sicurezza dell’infrastruttura. Definire un tracciato corretto, nel rispetto dei vincoli, può richiedere molto tempo e solo l’esperienza del Progettista e una approfondita analisi del terri…

ottimizzazione planimetrica tracciatoSwarmSettore ICAR/04 - Strade Ferrovie Ed Aeroportivincoli ambientali

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Estimating the safety performance function for urban unsignalized four-legged one-way intersections in Palermo, Italy

2014

Abstract Starting from consideration that urban intersections are sites with promise for safety and operational improvements, the paper describes the steps taken to develop a crash predictive model for estimating the safety performance of urban unsignalized intersections located in Palermo, Italy. The focus is on unsignalized four-legged one-way intersections widespread in Italian downtowns. The sample considered in the study consist of 92 intersections in Palermo, Italy. For the study were collected crashes occurred in the sites during the years 2006-2012, geometric design and functional characteristics and traffic flow. Results showed that data were overdispersed and NB1 distributed. In o…

overdispersionCrashSample (statistics)safety performance functionsSafety performance functions urban intersection overdispersion correlationTransport engineeringurban intersectionGeometric designGeographyOverdispersionlcsh:TA1-2040correlationSettore ICAR/04 - Strade Ferrovie Ed AeroportiPerformance functionlcsh:Engineering (General). Civil engineering (General)Generalized estimating equationCivil and Structural Engineering

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