Search results for "road"
showing 10 items of 851 documents
Hectoris spolium. (Sen. Troad. 990). Una controversa rappresentazione di Ecuba nelle Troiane di Seneca
2020
In the invective that Hecuba addresses to Ulysses in Troad. 990-991 Leo was the first to judge the expression Hectoris spolium feret / qui tulit Achillis? interpolated. Retracing the history of the interpretation, the paper considers the verses authentic: they offer a brilliant line of the queen, who ironically defines herself as Hectoris spolium.
Geodetic data analysis of VGOS experiments
2021
Very Long Baseline Interferometry (VLBI) serves as one of the common geodetic methods to define the global reference frames and monitor Earth's orientation variations. The technical upgrade of the VLBI method known as the VLBI Global Observing System (VGOS) includes a critical re-design of the observed frequencies from the dual band mode (S and X band, i.e. 2 GHz and 8 GHz) to observations in a broadband (2 – 14 GHz). Since 2019 the first VGOS experiments are available for the geodetic analysis in free access at the International VLBI service for Geodesy and Astrometry (IVS). Also regional-only subnetworks such as European VLBI stations have succeeded already in VGOS mode. Based on these br…
Investigation of data encryption impact on broadcasting visible light communications
2014
Este trabajo investiga el impacto de la encriptación y desencriptación de datos en un sistema de comunicaciones de luz visible (VLC) de difusión en interiores incrustado en la capa física. Se ha implementado el cifrado RSA para proporcionar una transmisión de datos segura en la capa física. El artículo muestra el rendimiento de la tasa de error de bits (BER) para los sistemas VLC seguros y no seguros (8 y 12 bits) para velocidades de datos de 2 y 12 Mbps. Para una BER de 10e-4 mostramos que hay penalizaciones de potencia de 2-4 dB con las VLC seguras. También se investiga el impacto de la longitud de la clave en la propagación del error y la penalización de potencia. EU Cost Action IC1101 T…
Road Functional Classification Using Pattern Recognition Techniques
2019
The existing international standards suggest a methodology to assign a specific functional class to a road, by the values of some features, both geometrical and use-related. Sometimes, these characteristics are in contrast with each other and direct the analyst towards conflicting classes for a road or, worse, one or more of these features vary heterogeneously along the road. In these conditions, the analyst assigns the class that, by his capability and experience, he retains the most appropriate, in a very subjective way. On the contrary, the definition of an automatic procedure assuring an objective identification of the most appropriate functional class for each road would be desirable. …
Comparative Analysis of Mega Road Construction Projects in Term of Innovation
2020
Purpose This paper examines, using critical realism, the causes and mechanisms of innovation in three civil road construction projects. Its focus is to examine how value can be created within the design process through innovation. Emphasis is placed on Best Value Procurement (BVP) as a procurement strategy where the preferred contractor is considered the expert, as it is the first case of its use in Norwegian road construction projects. Data was collected through surveys and interviews. Findings indicate that procurement using early involvement is innovative in the design process yet must be adapted, to allow for early planning of innovative ideas that help, to foster innovative solutions. …
What Erasmus students do expect from their abroad experience? A multidimensional scale tested for the case of Spain
2019
PurposeSince universities adopted a “Student as Customer” approach, student consumer behavior is a field of study which has become crucial. In the European higher education area, more understanding is needed on International students, and more precisely on Erasmus students. The purpose of this paper is to validate a multidimensional scale to assess Erasmus students’ value expectations (i.e. expected value) on the basis of costs and benefits in their choices as consumers of an academic experience abroad.Design/methodology/approachA survey conducted on a sample of 192 students from 50 universities show the role of functional, social and emotional values along with costs of time and effort in …
A comparative study of mobile messaging services acceptance to participate in television programmes
2010
PurposeThe purpose of this paper is to analyse key drivers of consumer acceptance of short messaging services (SMS) to participate in TV programmes.Design/methodology/approachThe technology acceptance model (TAM) and the theory of planned behaviour (TPB) have been integrated for the determinants of the acceptance of mobile data services incorporating variables regarding consumer‐media interaction (perceived value and affinity). The model has been tested using structural equation modelling.FindingsPerceived value, attitude and affinity towards television (TV) programmes determine SMS acceptance to participate in TV programmes in Spain. In contrast, subjective norm, perceived value and attitu…
Identifying critical incidents in naturalistic driving data: experiences from a promoting real life observation for gaining understanding of road use…
2013
The methodology of naturalistic driving observation aspires to observe the driver and his environment while driving in natural driving settings. It is of great importance in research on road safety as this method of observing road users eliminates the disadvantages of traditional methods like simulator studies or interviews. However, it produces vast such amounts of data and challenges data reduction and data analysis. Therefore automatic methods for filtering critical incidents based on thresholds for numerical data are often applied to select the data to be analysed. This study reports a small-scale field trial in Valencia, Spain, which was conducted within the promoting real life observa…
Structural-relaxation phenomena in As–S glasses as probed by combined PAL/DBAR technique
2015
Abstract Experimental techniques exploring phenomena of positron–electron interaction, namely the positron annihilation lifetime spectroscopy and Doppler broadening of annihilation radiation, are shown to be very informative tools to study radiation- and thermally-induced phenomena in chalcogenide glasses of binary As–S system. Time-dependent processes of free-volume voids agglomeration (expansion), fragmentation (refining) and disappearing (contraction) are identified as main stages of physical aging in S-rich glasses, while a competitive channel of coordination topological defects formation associated with void charging becomes significant in a vicinity of near-stoichiometric glass compos…
Dynamic properties of some β-chain mutant hemoglobins
1995
The thermal behavior of the Soret band relative to the carbonmonoxy derivatives of some beta-chain mutant hemoglobins is studied in the temperature range 300-10 K and compared to that of wild-type carbonmonoxy hemoglobin. The band profile at various temperatures is modeled as a Voigt function that accounts for homogeneous broadening and for the coupling with high- and low-frequency vibrational modes, while inhomogeneous broadening is taken into account with a gaussian distribution of purely electronic transition frequencies. The various contributions to the over-all bandwidth are singled out with this analysis and their temperature dependence, in turn, gives information on structural and dy…