Search results for "traffic"
showing 10 items of 598 documents
Traffic induced air pollution modeling: Scenario analysis for air quality management in street canyon
2019
This study was supported by the Riga City research project DMV-17-60-lī-03.02.2017. The authors wish to thank the Riga City Council and Latvian Environment, Geology and Meteorology Centre for data used in this study.
Two Teletraffic-based Schemes for Energy Saving in Cellular Networks with Micro-cells
2012
Published version of an article in the journal: Journal of Communications. Also available from the publisher at: http://dx.doi.org/10.4304/jcm.7.10.726-739 Open access The energy consumption of Base Stations (BSs) is known to constitute a major part of the power consumption in a cellular network. In this paper, we propose a novel approach which may switch a BS off under light traffic conditions in order to conserve the power consumption of such networks. More specifically, when the traffic load in the middle cell of a network with three micro-cells is sufficiently low, the corresponding BS can be switched off and its users will be covered by increasing the transmission power of one sector a…
Editorial: Calculation of Passenger Car Equivalents at Roundabouts
2021
Editorial on the Research Topic: Calculation of Passenger Car Equivalents at Roundabouts About this Research Topic: Calculation of Passenger Car Equivalents (PCEs) for heavy vehicles represents the starting point for the operational analysis of road facilities and other traffic management applications. PCEs are used to consider the presence of heavy vehicles in the traffic stream and are expressed as multiples of the effect of an average passenger car. Moreover, the highly curvilinear nature of the roundabout design, both in urban and rural environment, has significant effects on the paths that heavy vehicles would travel; as a consequence, the interaction between the physical and performan…
The eigen-structure of the Jacobian in multi-class Lighthill-Whitham-Richards traffic flow models
2007
Characteristic-based High Resolution Shock Capturing schemes for hyperbolic systems of conservation laws require, in their basic design structure, knowledge on the complete eigen-decomposition of the Jacobian matrix of the system. For the Multi-Class Lighthill-Witham-Richards (MCLWR) Traffic flow model considered in [4], there is no explicit formula for the eigenvalues of the Jacobian matrix, which can only be determined numerically. However, once they are determined, the eigen-vectors are easily computed and straightforward formulas can be obtained by exploiting the specific structure of the Jacobian matrix in these models. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Exploiting for Care: Trafficking and Abuse in Domestic Work in Italy
2017
ABSTRACTCare workers are now an essential part of reality for many Italian families. Yet, despite advancements in regulating domestic work, abuses are widespread. This article explores why exploitation in domestic work is rarely viewed as such and addressed with policies concerning trafficking and exploitation. I look at the way in which the care issue has been addressed by the Italian state and at the peculiar relationship between employers and domestic workers. Furthermore, I focus on the gaps in policies on trafficking and exploitation. I argue that the interplay of these factors results in the “normalization” of exploitation in domestic work.
L'assistenza umanitaria delle ONG sotto inchiesta
2022
Lo scorso giugno, l’Agenzia dell’Unione europea per i diritti fondamentali (FRA) ha pubblicato il consueto aggiornamento semestrale sulle operazioni di Search and Rescue (SAR) nel Mediterraneo. Il documento evidenza le difficoltà di condurre le operazioni di salvataggio da parte delle imbarcazioni delle ONG, molte delle quali sono state (e continuano ad essere) sottoposte a procedimenti giudiziari e fermi amministrativi nelle giurisdizioni degli Stati membri dell’UE. Nel quadro del contrasto al traffico di migranti, infatti, è ormai impellente una riforma del Facilitator Package quantomeno nel senso di vietare agli Stati membri di criminalizzare l’attività di assistenza umanitaria delle ONG…
Il traffico di migranti. Diritti, tutele, criminalizzazione
2015
Il volume affronta il tema del traffico di migranti da un punto di vista interdisciplinare, raccogliendo contributi di studiosi di varia provenienza. L'argomento vi è trattato non solo nella prospettiva - penalistica - della criminalizzazione dei trafficanti, ma anche in quella delle tutele da accordare al migrante trafficato e dei diritti da riconoscergli
Comparing Performances of Turbo-roundabouts and Double-lane Roundabouts
2012
Starting from assumptions regarding the arrival process of circulating streams and according to models based on the gap-acceptance theory, the paper is aimed at comparing operational performances between basic turbo-roundabouts and double-lane roundabouts. The paper proposes applications of the Hagring model for entry capacity estimations at double-lane roundabouts and turbo-roundabouts, these latter, in particular, featured by movements with only one or two conflicting traffic streams. This model allows to use, in fact, a bunched exponential distribution to quantify the distribution of major vehicle headways; it also considers specific values different by each lane for behavioural paramete…
Right-turn Bypass Lanes at Roundabouts: Geometric Schemes and Functional Analysis
2012
Right-turn bypass lanes can be implemented in conventional and innovative roundabout intersections to increase the capacity and improve the global functional performances. The Right-turn bypass lanes (also called slip lanes) can be distinguished according to the planimetric layout and the entry control type (stop, yield slip or Free Flow acceleration lane). This paper presents a closed-form model for the estimation of capacity, delays and level of service of roundabout equipped with Right-turn bypass lanes, considering the effect of geometric slip lane schemes, control type, vehicular and pedestrian flow. In order to examine the traffic conditions which can benefit from slip lane roundabout…
Road Traffic Pollution and Childhood Leukemia: A Nationwide Case-control Study in Italy
2016
Background The association of childhood leukemia with traffic pollution was considered in a number of studies from 1989 onwards, with results not entirely consistent and little information regarding subtypes. Aim of the study We used the data of the Italian SETIL case-control on childhood leukemia to explore the risk by leukemia subtypes associated to exposure to vehicular traffic. Methods We included in the analyses 648 cases of childhood leukemia (565 Acute lymphoblastic–ALL and 80 Acute non lymphoblastic-AnLL) and 980 controls. Information on traffic exposure was collected from questionnaire interviews and from the geocoding of house addresses, for all periods of life of the children. Re…