399 research outputs found
Convergence results for multivariate martingales
No full textWe present a new version of the Central Limit Theorem for multivariate martingales
Car-sharing relocation strategies: a state of the art
No full textTraditional car sharing systems are round-trip and require advance reservations. The advances of ICT and vehicle automation allow to improve car sharing sys-tems and to provide users with greater flexibility. As it concerns reservation, new car sharing systems offer users open-ended reservation and/or instant access. As it concerns the trip typology, new car sharing systems are multiple station shared vehicle systems (MSSVS). Roundtrips still occur in this type of system, however there is a large number of one-way trips made between the multiple stations. Operating an MSSVS is much more difficult than operating a round-trip shared vehicle systems. The problem is that the system can quickly become imbalanced with respect to the number of vehicles at the multiple stations. These systems are called new (or second) generation car sharing systems. Third generation systems are the last being developed; in these systems vehicles can be accessed at any point of the area. An overview of all these car sharing systems is provided in this paper
Raised crosswalks and their design features in traffic calming
No full textA road hump, or speed hump, is a traffic calming device used to reduce vehicle speed and volume on residential streets. Road humps are placed across the road to slow traffic and are often installed in a series of several humps in order to prevent cars from speeding before and after the hump. Speed humps are used in locations where very low speeds are desired and reasonable. Speed humps are typically placed on residential roads and are not used on major roads, bus routes, or primary emergency response routes. In Italy, the road humps are often built in shape of raised crosswalks, or RCWs, and they are generally placed both close and between intersections.
This paper deals with the analysis of observed data on a large sample of RCWs located in Tuscany, central Italy. Such data were referred both to geometry characteristics of the single raised crosswalk and recorded differences in vehicle speeds before and after it. Speed data were gathered using two automatic radar-recorders for each one of the sampled raised crosswalks.
All the collected data were analyzed trough statistical tests in order to assess their homogeneity or not between different locations and various types of roads. Finally, we were able of making some conclusions and highlighting design aspects. On one side, RCWs with similar geometries and higher heights (about 15 cm) have similar effects on vehicle speeds lowering, regardless of local conditions (location, road geometry, driver behaviour, etc.).
Moreover, raised crosswalks installed in a series have strong efficacy than the isolated ones. On the opposite side, the effects of raised crosswalks with smaller heights (less than 6 cm) show clearly a very low influence on vehicle speed variations
Memoria del progetto - Progetto della memoria. Udine. Archivi. Pratiche edilizie
No full textA partire dalla ricerca condotta sull’Archivio dell’edilizia privata del Comune di Udine, il volume è suddiviso in tre parti.
1/ “Udine – Città memoria progetto”, che propone una serie di interventi volti da un lato a fornire un quadro della cultura architettonica cittadina dall'Ottocento ai giorni nostri, dall’altro a compiere una più ampia ricognizione sulle fonti archivistiche pubbliche e private inerenti la storia urbana e l’architettura udinesi.
2/” Un archivio per la città. L’edilizia privata a Udine fra Otto e Novecento”, in cui i partecipanti al gruppo di ricerca sull’Archivio comunale dell’edilizia privata intervengono individualmente con contributi di analisi e, collettivamente, per esemplificarne i contenuti attraverso un percorso tematico e per immagini.
3/ “Fonti documentarie e sistemi informativi per l’architettura”. In riferimento al problema dell'utilizzo e della gestione delle fonti archivistiche concernenti l'assetto urbano e l'architettura, gli interventi proposti in questo capitolo presentano esperienze riferite a vari contesti e realtà nazionali
Raised crosswalks efficacy on the lowering of vehicle speeds
No full textA road hump, or speed hump, is a traffic calming device used to reduce vehicle speed and volume on residential streets. Road humps are placed across the road to slow traffic and are often installed in a series of several humps in order to prevent cars from speeding before and after the hump. Speed humps are used in locations where very low speeds are desired and reasonable. Speed humps are typically placed on residential roads and are not used on major roads, bus routes, or primary emergency response routes. In Italy, the road humps are often built in shape of raised crosswalks, or RCWs, and they are generally placed both close and between intersections.
This paper deals with the analysis of observed data on a large sample of RCWs located in Tuscany, central Italy. Such data were referred both to geometry characteristics of the single raised crosswalk and recorded differences in vehicle speeds before and after it. Speed data were gathered using two automatic radar-recorders for each one of the sampled raised crosswalks.
All the collected data were analyzed trough statistical tests in order to assess their homogeneity or not between different locations and various types of roads. Finally, we were able of making some conclusions and highlighting design aspects. On one side, RCWs with similar geometries and higher heights (about 15 cm) have similar effects on vehicle speeds lowering, regardless of local conditions (location, road geometry, driver behaviour, etc.).
Moreover, raised crosswalks installed in a series have strong efficacy than the isolated ones. On the opposite side, the effects of raised crosswalks with smaller heights (less than 6 cm) show clearly a very low influence on vehicle speed variations
Duality for rectified Cost Functions
No full textIt is well-known that duality in the Monge-Kantorovich transport problem holds true provided that the cost function c:X×Y→[0,∞] is lower semi-continuous or finitely valued, but it may fail otherwise. We present a suitable notion of rectification cr of the cost c, so that the Monge-Kantorovich duality holds true replacing c by cr. In particular, passing from c to cr only changes the value of the primal Monge-Kantorovich problem. Finally, the rectified function cr is lower semi-continuous as soon as X and Y are endowed with proper topologies, thus emphasizing the role of lower semi-continuity in the duality-theory of optimal transpor
Serotonergic neurotransmission manipulation for the understanding of brain development and function: Learning from Tph2 genetic models
No full textSerotonin (5-hydroxytriptamine; 5-HT) is a fascinating neurotransmitter that thanks to an extensive axonal network is released throughout the entire central nervous system (CNS) and exerts its action on the modulation of a countless number of physiological, behavioral and cognitive processes. In addition, cumulating evidences have linked alteration in 5-HT neurotransmission with the onset of psychiatric and neurodevelopmental disorders, such as depression, autisms and schizophrenia. Nevertheless only 5% of the total body content of serotonin exerts its action in the CNS, while the rest is synthetized and stored in peripheral tissues where it acts as an autacoid. In 2003 it became evident that two distinct isoforms of tryptophan hydroxylase (Tph), the rate-limiting enzyme for the synthesis of serotonin, are selectively expressed in peripheral tissues and in the CNS, with Tph2 as the brain specific isoform. In the present review we describe how the discovery of Tph2 has improved our understanding on the role of serotonergic neurotransmission. We mainly focus on the analysis of animal models generated by genetic manipulation of Tph2, in which the synthesis of brain serotonin was either reduced or disrupted. The consequences of an altered serotonergic neurotransmission on brain development, as well as on physiological and behavioral processes will be assessed. Finally, we report on several association studies that have linked single nucleotide polymorphisms (SNPs) in the human TPH2 gene with behavioral disturbances and neuropsychiatric disorders
Coronavirus morphology and evolution, with special emphasis on coronaviruses of carnivores
No full textThe several studies carried out by different researchers on canine coronavirus (CCoV) have focused upon the epidemiological relevance of this virus and, considering the wide diffusion of CCoV infections among dog populations, the Author underlines the need for further investigation on the biology of CCoVs and on the pathogenetic role of their infections. Genetic diversity among coronaviruses is accounted for by linear evolution as well as by a sudden, dramatic shift generated by RNA deletion or recombination events. In the last decade it has been observed that CCoV has evolved. During the monitoring of two pups naturally infected with CCoV, a long-term faecal shedding of the virus was observed and sequence analysis of the M gene fragment amplified from the faecal samples collected in the late stage of the CCoV infection, revealed a genetic drift to FCoV, which has led to the designation of these atypical CCoVs as FCoV-like CCoVs. In order to investigate more in-deeply the genetic diversity of these FCoV-like CCoVs, the attention was focused on the S gene which possesses a high degree of variation in the 5’end whereas it is more conserved in the 3’end. The analysis confirmed the existence of a new CCoV genotype in the faeces of pups with enteritis, which has been referred to as CCoV type I
A Theory of Stochastic Integration for Bond Markets
No full textWe introduce a theory of stochastic integration with respect to a family of semimartingales depending on a continuous parameter, as a mathematical background to the theory of bond markets.
We apply our results to the problem of super-replication and utility maximization from terminal wealth in a bond market. Finally, we compare our approach to those already existing in literature
Elastic deformations on the plane and approximations
No full textThe basis for these notes is the course given by the first author in the week June 20-24, 2011 at the SISSA of Trieste (Italy), during the intensive period "Nonlinear Hyperbolic PDEs, Dispersive and Transport Equations."
The aim of these notes is to give a good overview on the problem of the approximation of homeomorphisms in the plane, with a special emphasis on some new results
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