1,720,966 research outputs found
THE DESIGN OF WAITING AREAS TO OPTIMIZE THE STORAGE CAPACITY IN THE MARINE INTERMODAL TERMINALS
No full textThe appropriate sizing of storage areas to optimize the management of intermodal transport, the adoption of environment protection systems and the appropriate flow’s regulations inside manoeuvre’s zones can solve many problems encountered today in a intermodal marine terminal.
For these reasons the “integrated design” of storage areas for vehicles and containers is considered essential to ensure efficiency and functionality for all harbour-system.
So is here proposed a simulative model as a tool for a more correct design of waiting areas by considering the real stochastic conditions of the process of the arrivals.
For the sizing of areas for containers in the harbours, it is necessary to report the storage capacity in terms of TEU that can be stored (and handled) in the unit of time, e.g. in one year, with the extension of sites for storage of boxes and furniture with the other specific operating parameters.
The sizing of storage areas of the goods date constitutes a delicate problem the frequent shortage of the areas available. The ability to warehouse of the terminal is essentially determined from the interrelation between fixed and static parameters in the short period which the extension of the storage area, the height of the overlapping batteries of container (defined also like number of “shooting”), the means of movements and, at last, a series of parameters that can vary the efficiency’s degree according to of the operatives of the terminal.
The optimal level of use is caught up when it is employed approximately the 60-65% of the maximum storage capacity; account is kept, therefore, of a sure tolerance necessary in order to make forehead to eventual peaks of traffic in the periods in which the volume of container in the terminal or advanced to that mean. By use of the Sartor expression (1997), it is possible to find out the capacity of traffic C of a terminal for container in a period of reference (generally one year) and this can be useful in order to define the requirements of areas to assign to the storage
Analysis of the railway network operations safety, with of different obstacles along the route, by the study of Buffon-Laplace type problems: The case of infrastructure with irregular hexagonal lattices
Full text linkIn this paper we use an approach based on a Buffon-Laplace type problem for an irregular hexagonal lattice and obstacles to study some problems about analysis of the railway network operations safety in the presence of different obstacles on the route
Costruzione dei rilevati stradali e ferroviari: valutazione delle metodologie di progetto delle terre trattate con calce
No full textNella costruzione delle opere civili e, soprattutto, delle infrastrutture di trasporto, elemento qualificante per la minimizzazione degli impatti economici ed ambientali è l’adozione del trattamento con calce dei terreni argillosi di scavo, di per sé non idonei ad essere impiegati nei manufatti in terra, e la loro utilizzazione - previo trattamento con calce, appunto - per la costruzione di rilevati ed altre opere in terra. La tecnica del trattamento con calce delle terre argillose permette di ottenere diversi vantaggi di ordine tecnico, economico ed ambientale. I progressi tecnologici conseguiti negli ultimi decenni, particolarmente per
quanto riguarda gli studi di progetto, i mezzi di cantiere ed i processi costruttivi hanno
permesso, di estendere tale tecnica con successo agli strati superiori del rilevato ed anche
agli strati di fondazione della pavimentazione. Considerato che i principali Capitolati Italiani
prevedono metodologie differenti per il progetto delle miscele terra-calce, alcune delle quali
si distinguono nettamente da quanto previsto in campo internazionale e, in particolare, dalla
norma armonizzata a livello europeo EN 14227-11 “Terreno trattato con calce”, è parso
opportuno valutare comparativamente tali metodologie con quelle internazionali più
consolidate, al fine di verificare, tramite un ampio piano sperimentale, l’idoneità delle
indicazioni e dei riferimenti per gli studi di formulazione delle miscele in esse contenute. Si
dimostra che la metodologia ANAS si discosta significativamente oltre che dalle altre in uso
in Italia (RFI), anche dalle principali normative internazionali e, considerata l’ampia
diffusione di tali specifiche per i lavori stradali in Italia, i risultati presentati evidenziano la necessità di una pronta revisione di tale metodologia, anche per un utile allineamento a quanto previsto dalla normativa europea al riguardo
Lo studio delle criticità d'esercizio nella rete ferroviaria, a causa di ostacoli, di forme diverse, attraverso problemi geometrici di tipo Laplace
No full textLe normali condizioni di funzionamento della rete ferroviaria possono essere talvolta compromesse in esercizio da situazioni particolari che non consentono, a causa di ostacoli lungo la linea, l’ordinaria circolazione dei mezzi. In tali condizioni di criticità, occorre allora opportunamente individuare appositi itinerari alternativi per assicurare con efficacia l’effettuazione del servizio del trasporto al previsto recapito finale, per ciascuna delle relazioni Origine-Destinazione O-D interessate dall’evento esaminato. Dal punto di vista metodologico il problema è stato affrontato facendo ricorso alla teoria delle probabilità geometriche. Si è considerato il grafo rappresentativo della rete come un insieme di figure geometriche formanti appositi reticoli R nello spazio geometrico di riferimento e ci si è serviti di particolari corpi-test (modelli matematici), rappresentativi dei treni, per studiare il relativo moto di R e le eventuali interferenze su di essi generati da ostacoli (di forma e dimensioni prefissate) lungo il percorso O-D
Design Procedures for Soil-Lime Stabilization for Road and Railway Embankments. Part 2-Experimental Validation
No full textAs detailed in Part 1, the most common Italian Technical Specifications refer to different design methodologies for design of lime-soil mixtures, some being quite different from those internationally adopted. Therefore, it seemed appropriate to the Authors to compare these methodologies, via a wide experimental program.It is shown that the Italian methodology of the National Road Agency is different not only from those used in Italy, but also from the main international standards. The experimental results highlight that a revision of that methodology is needed in order to bring it into line with what is prescribed by the European standard
Design Procedures for Soil-Lime Stabilization for Road and Railway Embankments. Part 1-Review of Design Methods
No full textWhen selecting the appropriate materials for constructing road infrastructures, an important way for minimizing both the economical and environmental impact is to make use of lime for treating soils that are not suitable for road or railways construction.Advances in lime stabilization technique allowed the successful use of this technique also for improving the bearing capacity of the subgrade, with noticeable savings on both aggregate and disposal charges.In this paper a review of internationally adopted design methods for soil-lime mixture is presented, in order to compare testing methods and requirements of the adopted criteria, as discussed in Part 2
An Autoethnographic Approach to Faculty Development Through a Longitudinal Analysis of a Co-taught Workshop
Full text linkThe present contribution explores howa co-taughtworkshop, designed
and delivered in the last two academic years within two curricular disciplines of the third year of the degree course in Science of Education at University of Macerata (Italy), took advantage of autoethnography as a reflective method to enrich the interdisciplinary relationship between the two professors involved and their mutual growth in terms of instructional design and teaching practices. The exploration of Self as a data source allowed both researchers (in their teaching role) to reflect on core areas of faculty development in connection with the specific co-teaching style they adopted. Autoethnography allowed all the involved actors (students and professors) to visualize a transformative direction in their academic identity and professional growth. The discussion of the results is based on a content
analysis of different data sources where all the data were triangulated in a double connotation, that is, between professors and among the different sources in an iterative process
Thinking Groups and the Development of Affective Problem-solving competencies within Online Learning Environments at University Level
No full textIn this paper we present the first findings of an online problem-solving experience for undergraduate students, attending a topology course within Bache-lor of Mathematics, aiming to promote the construction of problem-solving com-petencies by using cognitive roles within thinking groups, with a magnifying lens on the affective level. The key idea of personifying cognitive functions by cogni-tive roles in a problem-solving process represents the engine of an ongoing re-search on the construction of problem-solving undergraduate student’s compe-tencies, begun with an analysis of some metacognitive aspects that students expe-rienced by playing the roles. Each individual role corresponds to a cognitive func-tion coming into play when a mathematician faces a problem. Each collective role corresponds to a problem-solving thinking process performed by a thinking group. To shed the light on student’s emotional outcomes and on the impact of the use of online learning environments on student’s affective dimension, we fo-cus our qualitative analysis on student’s emotional experience both with respect to the structured problem-solving activities and the digital tools, coming out from some protocols, to understand if and how they foster conditions for developing emotional competencies according to Goldin’s idea of affective competencies
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