Search results for "cost"
showing 10 items of 5421 documents
Biomechanics Parameters in the Vehicle-Cyclist Crash with Accident Analysis in Palermo
2014
The vehicle-bicyclist impact is studied in this paper. After analysis of the accidents in Palermo in the last years, the multibody simulation of the crash is executed by making use of Visual Nastran. Dummy, car and bicycle are those used in previous works. The attention is on a teenage cyclist, because the data on this argument are found in literature with difficulty. The impact is simulated at four different speeds until 50 km/h, with three different positions of the cyclist relative to the vehicle: frontal, side and rear. In particular the injury of the head is analyzed using the parameter HIC and the chest injury is analyzed by 3 ms criterion; the likelihood AIS 4+ is calculated, conclud…
Biomechanics Parameters in Teenage Cyclist – SUV Accident and Comparison with the Pedestrian
2015
The study of the injury caused by the vehicle-teenage cyclist crash is presented in this paper. The vehicle is a SUV, with high frontal part, in order to compare the results with those obtained previously in the sedan- teenage cyclist crash and begin a study of the influence of the frontal shape of the vehicle. No variation is executed on the model of the teenage cyclist and the bike. Three different positions are analyzed: front, rear and lateral position. The injury on the cyclist head is examined by HIC criterion, in the way indicated in the rules. Correlation HIC – AIS is used to calculate the lethality of the injuries. The principal conclusion is done that the injury of the head is mor…
A New Theoretical Approach on Teenage Cyclist-Vehicle Crash
2016
Data obtained in teenage cyclist impact against three vehicles (sedan, SUV and Pick Up), tested in previous works, are analyzed to verify the theoretical results by the coupling of momentum conservation principle and energy conservation principle. The speed of vehicle and thorax are compared with theoretical ones, obtaining an excellent agreement. Following the results found in the literature, particular emphasis is done on teenager cyclist thorax and head speeds, indicating that the cyclist speed can be theoretically until 1,41 times the impact speed, while greater values, until 2, are obtained in the simulations. A small slowing of the vehicle is found theoretically and in the simulations…
Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications
2015
The present work describes the experimental mechanical characterisation of a natural flax fibre reinforced epoxy polymer composite. A commercial plain woven quasi-unidirectional flax fabric with spun-twisted yarns is employed in particular, as well as unidirectional composite panels manufactured with three techniques: hand-lay-up, vacuum bagging and resin infusion. The stiffness and strength behaviours are investigated under both monotonic and low-cycle fatigue loadings. The analysed material has, in particular, shown a typical bilinear behaviour under pure traction, with a knee yield point occurring at a rather low stress value, after which the material tensile stiffness is significantly r…
Effect of NaOH Treatment on Properties of Phoenix Sp. Fiber
2016
The aim of this paper is to investigate the effect of an alkali treatment on physical, chemical, mechanical, and morphological properties of Phoenix Sp. fibers. The use of natural fibers as reinforcement in polymer composites requires a deep investigation to understand their behavior and which treatment is more appropriate to improve the quality of the untreated material. For this reason, fibers were extracted from the petioles of the Phoenix Sp. plant and they were treated with NaOH solution in different weight concentrations (5%, 10%, and 15%). The mechanical behavior was investigated through tensile test on single fiber at different gauge length (20 mm, 30 mm, 40 mm, 50 mm, and 60 mm). C…
Impacto clínico y coste-utilidad del tratamiento de la osteoporosis en España
2021
La osteoporosis es una enfermedad metabólica generalizada que se caracteriza por la pérdida de la cantidad y la calidad de hueso. Provoca dolor de espalda y aumenta el riesgo de sufrir una fractura ósea por fragilidad, produciendo mayor morbilidad y mortalidad, junto a un incremento del dolor y disminución de la calidad de vida. Constituye un problema sanitario y de Salud Pública debido al aumento del coste socio-sanitario producido por las fracturas. Existen diferentes fármacos para el tratamiento de la osteoporosis, se diferencian en aquellos que previenen la reabsorción ósea o los que forman hueso. Entre ellos, la teriparatida es un inductor óseo que tiene efectos positivos en la microar…
Una città reiventata
2007
A partire dall’esame del documento che elenca le ragioni dell’iscrizione di Ragusa nella World Heritage List, il saggio propone un inquadramento critico, previa contestualizzazione storica, delle vicende ricostruttive avviate a seguito del terremoto del 1693 nella città di Ragusa. Nel quadro comitale, l’opzione dello sdoppiamento si rivela “singolare” e offre lo spunto per indagare sincronicamente due diverse problematiche: nel caso della città superiore, quella afferente la fondazione ideale di uno spazio urbano, condotta attraverso l’adozione di un piano urbanistico che rendeva immediatamente leggibile l’innesto delle gerarchie sociali; nel caso dell’antico sito, in assenza di un piano no…
Occuparsi di città oggi
2008
il saggio introduce il testo mettendo in evidenza come le grandi tematiche dell'urbanistica contemporanea non riguardano più l’addizione di nuove parti alla città, ma essenzialmente il riuso di aree urbane che, per varie vicende, vengono a degradarsi o che occorre che cambino destinazione e forma. Per queste ragioni i temi dell’emergenza e delle ricostruzioni costituiscono occasione di riflessione per futuri approcci che permettono alla disciplina del pianificare di acquisire nuove visioni e nuovi approcci teorici. I casi della ricostruzione successiva ai terremoti e dell’edilizia sociale forniscono quindi temi di grande interesse per futuro della disciplina urbanistica.
Il Belice prima e dopo il 1968 attraverso le iconografie
2014
Il saggio presenta come l' intero territorio della valle del Belice abbia cambiato identità dopo il terremoto del 1968. Attraverso le iconografie (fotografie, disegni) di architetture esistite e poi distrutte. The 1968 earthquake in western Sicily is a break point in the history of a territory rich and layered. The journalism has mainly dealt with the case Gibellina, but in reality is the entire geographical area to have changed relationships and vocations. The iconography and photographs can witness the difference that occurred within a few years. In fact, the contemporary architecture linked to the reconstruction is only one of the parameters suitable to interpret mutations identity of pl…
L'utilizzo del ferro a Palermo dopo il terremoto del 1726
2016
La ricerca, basata essenzialmente sullo studio di una consistente mole di documenti emersi attraverso nuove indagini archivistiche, mira a indagare gli aspetti tecnici legati agli interventi sul patrimonio architettonico di Palermo successivi al terremoto del 1726, approfondendo il ruolo degli architetti e dei maestri coinvolti nel processo di ricostruzione delle fabbriche colpite e ponendo particolare attenzione alle tecnologie messe in atto facenti ricorso all’uso ferro, indagate attraverso lo studio di alcuni casi esemplificativi. Questo materiale, infatti, trovò in questa occasione diverse applicazioni. L’intervento più frequente fu relativo all’inserimento di catene in ferro in corrisp…