359 research outputs found
Studio teorico e sperimentale di un sistema di locomozione per una capsula endoscopica
Questo studio teorico-sperimentale mira alla realizzazione di un sistema di locomozione per una microcapsula endoscopica minimamente invasiva. Un dispositivo teleoperato e dotato di locomozione attiva deve essere in grado adattare il proprio gait in funzione del tratto gastro intestinale esaminato, diversificando gli schemi di movimento per ruotare o arrestare la capsula in caso di bisogno. L’approccio che ha guidato il lavoro è stato di tipo biomimetico così da trarre ispirazione dai modelli esistenti in natura. La locomozione su gambe risponde alle esigenze di questa ricerca in termini di efficacia, adattabilità e destrezza per cui è stato realizzato un robot esapode con postura sprawled, ispirato agli insetti. Sono state quindi studiate le proprietà meccaniche e biotribologiche del tessuto gastrointestinale. E’ stato predisposto il set-up sperimentale per i test in vitro e sono state effettuate prove con differenti gait di locomozione, all’interno di tubi rigidi, in lattice e di tessuto animale: il gait a “vogatore alternato” si è rivelato il più efficace. Il prototipo è in grado di muoversi all’interno di un tubo di lattice alla velocità di circa 11,3 cm/min.; ulteriori indagini con il tessuto animale saranno svolte a seguire
I viaggiatori inglesi in Egitto tra la seconda metà del settecento e la prima metà dell’ottocento: diari di viaggio
Il presente studio di tesi ha come obiettivo l’analisi di tre diari di viaggi scritti in un periodo storico che va dal 1792 fino al 1863.
I tre testi scelti sono: ‘Travels in Africa, Egypt and Syria from the years 1792 to 1798’, scritto da William George Browne, ‘Travels in Egypt, Nubia, Holy Land, Mount Libanon and Cyprus, in the year 1814’ di Henry Light e ‘A winter in Upper and Lower Egypt’ di George Alexander Hoskins. È stato deciso di analizzare questo periodo per mettere in evidenza il motivo per cui l’Egitto era diventato meta di così tanti viaggi, preferito addirittura a Italia e Grecia. È stato dato un largo spazio alle descrizioni degli aspetti sociologici, paesaggistici e soprattutto delle scoperte archeologiche che portarono allo sviluppo dell’egittologia intesa in senso moderno
Clutter Suppression Using Thresholded Reciprocal Filter in OFDM Radar
Thresholded reciprocal filtering (TRF) techniques have been proposed as supervision strategies for reciprocal filtering (RF) in order to address the challenges posed by the unique characteristics of orthogonal frequency-division multiplexing (OFDM) waveforms when used for radar. These techniques are known to provide a larger flexibility for the signal processing scheme at the range compression stage by enabling the possibility to operate on signal fragments of arbitrary length, while simultaneously retaining the RF's benefits in terms of point-like target response. In this paper we extend the study of TRF techniques by presenting a theoretical analysis of their impact on the clutter suppression capability of the system. To this end, we firstly characterize the theoretical performance of the TRF techniques in terms of residual clutter power obtained at the output range-Doppler map. The derived analytical expressions further allow us to introduce optimized variants of the TRF, that are able to maximize the performance metrics. An extensive simulation-based validation shows that the proposed solutions outperform traditional methods, especially in low to moderate clutter-to-noise conditions. Moreover, the assessment of the proposed technique against an experimental dataset allows us to validate the practical effectiveness of the TRF approach
Managing lifecycle of product information with an ontology-based knowledge framework
The effective management of product information within a formalized, digital and interoperable infrastructure remains a significant gap in realizing the full potential of modern Product Lifecycle Management (PLM) implementations in industrial contexts. While the academic paradigm of PLM has been extensively emphasized in the scientific literature for over two decades as a sustainable company strategy, contemporary PLM implementations prove inadequate in handling the extensive volume and variety of information generated throughout a product's lifecycle. Starting from a comprehensive overview of the evolution of the PLM paradigm and of its inherent implications, the analysis of the PLM implementation of a big player in engineering and manufacturing of turbomachinery products for Oil & Gas and Energy markets is analyzed, allowing to identify existing major general contradictions from an industrial perspective. While it is reaffirmed that the attainment of a neutral, harmonized and universally agreed standardization is nowadays missing and is crucial in the enabling of the PLM paradigm through digital technologies, the present study attempts to demonstrate how a general and agnostic ontology-based framework may straightforwardly fulfill all the identified demands of the PLM paradigm and, therefore, how ontologies play a central role in this field of research by bridging different domains to enable a holistic product conceptualization, lifecycle management, and data interoperability among different digital agents
[Eugeniusz Quirini de Saalbrück], "Kirkcaldy. Polish Christmas in Scotland in 1940"
This text is an edited source material that is a part of the memoirs of Certified Colonel Eugeniusz Quirini de Saalbrück (1891-1978) from his stay in Scotland in his capacity as a cultural and educational officer in the Polish soldiers camp in Kirkcaldy during World War II. The text is an account of a Christmas celebration organised for Scottish children on 19 December 1940 under the supervision of Col. Quirini in the local Rio cinema. The original text is part of Col. Quirini’s estate that is in the possession of his family
The development of the tourism function of the Eastern Beskidy Mountains in the years 1873-2006 (Lwow and Iwano-Frankowsk districts)
"Ad ornatum templorum loci Pere erant" : evacuation of the works of art from the Latin churches of Pera after 1453
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