Search results for "050210 logistics & transportation"
showing 10 items of 331 documents
Modelling pavement surface characteristics for noise prediction through Bailey-related indicators
2021
The aggregate gradation of bituminous mixtures (hot mix asphalts, HMA) is one of the major factors affecting their surface texture. In turn, this latter is a crucial factor and influences drivers and bystanders’ safety, comfort, and health. Despite this, the design of texture levels still lacks sound bases and dedicated algorithms and this negatively affects the acoustic design of bituminous mixtures. Consequently, the objectives of this study were confined into the derivation of relationships to be used in mix design to predict texture levels. Experimental data were analyzed, in the pursuit of setting up appropriate models and algorithms. Analyses involved the consideration of Bailey-relat…
Analysis of dust exposure during chainsaw forest operations
2017
Abstract: In 1999, the European Union proclaimed hardwood dust carcinogenic based on the classification of the International Agency for Research on Cancer (IARC) issued in 1995. The operational exposure limit (OEL) for inhalable wood dust has been set to 5 mg m-3 by EU directives, though in different countries the OEL ranges from 1 to 5 mg m-3. The objective of this study was to determine the exposure to wood dust of forest workers in chainsaw cutting and processing and suggest possible countermeasures. The study took into consideration different silvicultural treatments (coppice clear cut, conifer thinning, conifer pruning, and sanitary cut) and chainsaw fuel (normal two-stroke gasoline mi…
Pricing and infrastructure fees in shaping cooperation in a model of high-speed rail and airline competition
2020
Abstract This paper studies the effects of cooperation in a hub-and-spoke network with high-speed rail and airline competition. The distinctive elements of our analysis are the consideration of: (i) per-passenger airport and rail infrastructure fees; (ii) mixed bundling pricing by partners, and (iii) an airline duopoly in the international market. We show that partners fix the cheapest bundle price of the combined trip, that non-allied operators respond by decreasing the prices per link, and that connecting traffic increases. Per-passenger fees significantly affect the price differences following cooperation. An empirical application confirms that it is privately profitable and that welfare…
Bio materials with reclaimed asphalt: from lab mixes properties to non-damaged full scale monitoring and mechanical simulation
2019
Three innovative environmentally friendly pavement materials, designed with 50% of Reclaimed Asphalt and three different biomaterials (2 bio-additivated bitumens and 1 bio-binder), were produced in an industrial plant. These mixes were tested in lab and also at full scale using an Accelerated Pavement Test facility. The asphalt mix viscoelastic properties were measured in lab and their intrinsic viscoelastic response were simulated. These rheological models are used to simulate the pavement mechanical response using both elastic and viscoelastic multilayer codes. Hence, full scale measurement performed during the full scale test at an early stage (without damages) can be compared with these…
QUALITATIVE RESEARCH IN TRAVEL BEHAVIOR STUDIES
2016
Qualitative methodology is extensively used in a wide range of scientific areas, such as Sociology and Psychology, and it is been used to study individual and household decision making processes. However, in the Transportation Planning and Engineering domain it is still infrequent to find in the travel behavior literature studies using qualitative techniques to explore activity-travel decisions. The aim of this paper is first, to provide an overview of the types of qualitative techniques available and to explore how to correctly implement them. Secondly, to highlight the special characteristics of qualitative methods that make them appropriate to study activity-travel decision processes. Fa…
Coping with the costs of car dependency : A system of expedients used by low-income households on the outskirts of Dijon and Paris
2018
International audience; Living on low incomes and in a car-dependent area is often interpreted as a double burden for households, even if the two characteristics are often interdependent. While their capacity for mobility is lower, low-income households in outer suburban areas are nonetheless mobile. Their capacities in this domain should not be underestimated or overlooked. They can command a set of alternative practices or expedients to deal with car-related economic stress by a set of resources derived essentially from spatial proximity. This article aims to present and analyse the diversity of these expedients for the case of outer suburban areas around Paris and Dijon. The analysis of …
DO TRANSPORT COSTS HAVE A DIFFERENTIAL EFFECT ON TRADE AT THE SECTORAL LEVEL?
2008
This article aims to analyse the determinants of transport costs and to investigate their influence in international trade with a sample of disaggregate trade data. First, we estimate a transport-cost function using cross-section data on maritime and overland transport for four sectors: agro-industry, ceramic tiles, motor vehicle parts and accessories, and electrical and mechanical household appliances, obtained from interviews held with Spanish exporters and logistics operators in 2001. Second, we study the relationship between transport costs and trade and estimate the elasticity of trade with respect to transport costs for each sector. Important differences for high value- and low value-…
The Impact of Mandatory Helmet-Use Legislation on the Frequency of Cycling to School and Helmet Use Among Adolescents
2016
Background:This paper analyzes changes in the frequency of cycling to school and helmet wearing after the introduction of a mandatory helmet law, and attempts to identify factors associated with the acceptance of helmet use.Methods:A mixed-method study was designed with a 7-month follow-up period (April 2014 to November 2014). The initial sample included 262 students (aged 12 to 16 years) from Valencia, Spain. The data were collected by questionnaire and 2 focus-group interviews were conducted.Results:No significant changes in cyclingto-school behavior were found during the study period. Cycle helmet use improved, especially among boys, those who used their own bike, and among adolescents w…
Effect of Road Safety Education on Road Risky Behaviors of Spanish Children and Adolescents: Findings from a National Study
2018
Background: Road Safety Education (RSE) is widely known as a reliable determinant of the future results for what concerns health and welfare and as an undisputable factor which contributes to the social behavior of individuals and to their mid- and long-term road safety outcomes. However, its development has been relatively scarce in most countries, a fact which has contributed to letting matters as delicate as traffic crashes, largely explained by road misbehaviors, continue to be a prevalent problem, thus affecting the health of the community. Objective: The aim of this study was to describe the relationship between demographic and RSE-related variables and the self-reported road risky be…
Well-being, behavioral patterns and cycling crashes of different age groups in Latin America: Are aging adults the safest cyclists?
2019
ObjectivesThis study aimed at analyzing the cycling safety-related factors and the mental health indicators of elderly cyclists in comparison with other age groups.MethodsFor this cross-sectional study, we analyzed the data of 911 bicyclists from two Latin American countries that have been experiencing a substantial growth of urban cycling during the last few years: Colombia and Argentina. Participants responded to an e-questionnaire on bicycling behaviors, mental health and cycling safety.ResultsAging adults reported lower rates of risky behaviors and traffic crashes (around .38 in five years), and, on the other hand, more cycling protective behaviors, a higher risk perception and a better…