Search results for "BAND"

Politiche e disposizioni per il ripopolamento dei piccoli centri abbandonati. Alcune riflessioni

2020

The contribution constitutes an introduction to one of the sections of the conference, which highlights the need to put in place, on the issues in question - the depopulation of inland areas - a pre-eminent pedagogical-formative action that helps communities to reverse their gaze by considering small towns a resource.

Rinascita di un paesaggio sul sedime di una linea ferrata.

2015

Energy, economic and environmental reasons lead to a review of the role of railway lines in the general awareness of the need for a paradigm change regarding mobility and transport, as desired by the European Union. In particular, this is important in marginal and distressed contexts. The paper focuses on the African front of Sicily which is in conditions of economic and social marginality. And this is different from what happens in the remaining coastal areas where the metropolitan cities are. The narrow gauge railway line from Porto Empedocle to Castlvetrano, born at the service of the inland mines, it is strategic because the absence of high-speed roads has led to the safeguarding of the…

Graph-based minimal path tracking in the skeleton of the retinal vascular network

2012

This paper presents a semi-automatic framework for minimal path tracking in the skeleton of the retinal vascular network. The method is based on the graph structure of the vessel network. The vascular network is represented based on the skeleton of the available segmented vessels and using an undirected graph. Significant points on the skeleton are considered nodes of the graph, while the edge of the graph is represented by the vessel segment linking two neighboring nodes. The graph is represented then in the form of a connectivity matrix, using a novel method for defining vertex connectivity. Dijkstra and Floyd-Warshall algorithms are applied for detection of minimal paths within the graph…

DETERMINAZIONE DELLA DURATA A FATICA DI COMPONENTI SOGGETTI A SOLLECITAZIONI SCHEMATIZZABILI COME PROCESSI ALEATORI A BANDA STRETTA

2016

In questo lavoro sono state sviluppate le espressioni analitiche per la determinazione della durata a fatica di componenti soggetti a svariate tipologie di sollecitazione aleatorie a banda stretta (con parametro di irregolarità 0.9<aX≤1), in particolare: processi non stazionari di tipo separabile, tensione normale monoassiale con tensione media costante, sollecitazione biassiale con tensioni normali agenti in fase, sollecitazione di sforzo normale e tensione tangenziale agenti in fase, propagazione della frattura. In this paper the analytical equations for the determination of the fatigue life of components subjected to various types of narrowband random processes of stress (having irregula…

A Chemical Approach to the Modelling of Band Gap of Passive Films for Corrosion Studies

2015

Photocurrent Spectroscopy (PCS) has gained a large consideration in the last decades as in situ technique for the characterization of semiconductors and photoconducting passive film/electrolyte junctions being able to provide information on the location of characteristic energy levels like: flat band potential (Ufb), internal photoemission threshold (Eth) and band gap value (Eg)

A Chemical Approach to the Estimate of the Optical Band Gap and Bowing Parameter in Mixed d,d-Metal Oxides

2012

An Electrochemical Investigation on the Adhesion of As-Formed Anodic TiO2 Nanotubes Grown in Organic Solvents

2011

Nanochemistry Aspects of Titania in Dye Sensitized Solar Cells

2009

We analyze the main nanochemistry factors affecting photovoltaic performance in TiO2 employed as wide bandgap semiconductor in dye-sensitized solar cells (DSCs). What is the best morphology of the oxide? Which processes yield the required structures? Finally, putting the discussion in the context of the rapid evolution of photovoltaic technologies, we argue that new titania nanostructures will form the basic component of second-generation solar modules based on dye solar cells.

End-to-end Bandwidth Estimation in the Wide Internet

2010

The quest for bandwidth estimation techniques for large-scale distributed systems

2010

In recent years the research community has developed many techniques to estimate the end-to-end available bandwidth of an Internet path. This important metric can be potentially exploited to optimize the performance of several distributed systems and, even, to improve the effectiveness of the congestion control mechanism of TCP. Thus, it has been suggested that some existing estimation techniques could be used for this purpose. However, existing tools were not designed for large-scale deployments and were mostly validated in controlled settings, considering only one measurement running at a time. In this paper, we argue that current tools, while offering good estimates when used alone, migh…