1,720,984 research outputs found
Relationships between accidents and geometric characteristics for four lanes median separated roads
No full textRelationships between accidents and geometric characteristics for four lanes median separated roads
No full textDIY materials from potato skin waste for design
Full text linkThis work concerns the creation of a wall display for fruits, made in a DIY material structure, as the result of a 'material tinkering' process over waste to enable understanding possible application in a design context. The material and object are obtained starting from potato skins, as an example of waste very frequent in the food processing chain, in most local contexts. The display is specifically designed in a double layer configuration, partially translucent, coloured with food dyes and aromatised during the experimentation phase to ensure its suitability to the purpose. Some basic characterisation tests were also performed to allow for the possible development of a customised product from this material demonstrator. The process, in giving some value to a typical and very diffuse food chain waste, would therefore guarantee the upcycling of the relevant refuse. The structure is intended for application into a context of farm holiday site and aimed at presenting local products, ideally coming from the very farm fields involved
Study of the impact of the vehicles against the concrete barriers delimiting the area of approach to narrower carriageways in function of the barrier's features
No full textThis paper examines the influence of the different factors that affect the problem of the collisions against the concrete safety barriers used to narrower the carriageways. In particular we studied both the influenece of the damage of the vehicles and the shear strength necessary in teh joints between the barriere elements. Moreover we pointed out some caracteristic aspects of this accident. For this pourpose we developed a specific software to simulate these collisions.
The study showed that the most important factor is the angle formed between the inclined barriers with the longitudinal direction. The analysis also pointed out that this collisions can be very dangerous both for the first vehicle contacting the barrier and the following on
Parental rejection, addiction and current fathering: A Comparative Study
Full text linkVery little is known about drug-abusing men’s parental relationships in childhood and about the influence that these relationships could have on their drug use/abuse and on their current fathering. This study aims to examine how the maternal and/or paternal acceptance/rejection may have influenced drug-abusing men’s fathering and how it could have consequences on the drug-abuse itself. Generalized linear models, hierarchical logistic regression and correlations were used to show how 41 drug-abusing fathers residing in rehab clinics differ from 41 fathers with no history of drug-abuse as regards the relationships with their parents and with their children. Men who enrolled in the study completed a socio-demographic interview and a battery of 3 self-report measures selected to document their current fathering and the relationships with their parents. When the drug-abusing fathers were compared to fathers with no history of drug- use/abuse, appeared that: (i) drug-abusing men perceive their fathers as highly rejecting; (ii) the higher is the remembrance of paternal rejection the greater is the likelihood that the adult is classified in the addicted group; (iii) drug-abusing fathers actualize less parental control; (iv) in drug-abusing men group, maternal acceptance/rejection influences their current fathering. Parental rearing practices have important consequences on addicts’ drug abuse and on their current fathering
Sub Ballast Role in Dynamic Train-Track-Superstructure Interaction in High Speed Lines
No full textPARI
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
CFD Modeling for Estimating Consequences of Liquid Hydrogen Release Transported by Road Tankers through Tunnels
No full textAmong the new energy carriers targeted at mitigating greenhouse gas emissions, the use of hydrogen is likely to experience substantial growth in the future. In this context, the transport of liquid hydrogen by means of road tankers might represent the most cost-effective option for delivery over long distances in the short-term perspective. Liquid hydrogen, however, entails non-negligible risks, especially in confined spaces like road tunnels. An accidental release might form a flammable hydrogen cloud that might deflagrate or even detonate. Nevertheless, the consequences on users in the event of accidental leakage of liquid hydrogen from road tankers have not yet been sufficiently investigated. Therefore, this paper regards specific 3D computational fluid dynamics models to quantify the effects due to both liquid hydrogen release and potential deflagration and/or detonation within road tunnels. The proposed models were calibrated and subsequently validated with the findings of certain literature studies. Since the effects on tunnel users might be influenced, apart from tunnel geometry, by the type of ventilation and traffic flow, tunnel environmental conditions involving natural or mechanical ventilation, as well as off or peak traffic hours (i.e., night or day traffic) were more especially investigated. The results of simulations, in terms of overpressures generated from a potential hydrogen explosion, showed benefits due to mechanical ventilation and/or under lower traffic flows. By providing additional knowledge to the field of hydrogen safety, this study might help tunnel management agencies to make improved management and/or traffic control strategies (e.g., decisions on whether or not mechanical ventilation should be installed also in tunnels less than 1,000 m long and/or allowing the transit of road tankers transporting liquid hydrogen only at night rather than day)
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