165 research outputs found
Wandering with the Times. An Advanced Mobile Phone Guide to Architectural/Urban Heritage
No full textAutomatically Detecting Changes and Anomalies in Unmanned Aerial Vehicle Images
No full textThe use of unmanned aerial vehicles (UAVs) in civil aviation is growing up quickly, enabling new scenarios, especially in environmental monitoring and public surveillance services. So far, Earth observation has been carried out only through satellite images, which are limited in resolution and suffer from important barriers such as cloud occlusion. Microdrone solutions, providing video streaming capabilities, are already available on the marketplace, but they are limited to altitudes of a few hundred feet. In contrast, UAVs equipped with high quality cameras can fly at altitudes of a few thousand feet and can fill the gap between satellite observations and ground sensors. Therefore, new needs for data processing arise, spanning from computer vision algorithms to sensor and mission management. This paper presents a solution for automatically detecting changes in images acquired at different times by patrolling UAVs flying over the same targets (but not necessarily along the same path or at the same altitude). Change detection in multi-temporal images is a prerequisite for land cover inspection, which, in turn, sets up the basis for detecting potentially dangerous or threatening situation
A Digital Rights Aware Similarity Measure for Multimedia Documents
No full textThis paper presents a novel approach to the retrieval of multimedia documents that considers Intellectual Property Rights (IPR) metadata as a multidimensional feature in a metric space. The approach allows us to perform similarity searches on the IPR attributes of digital items and to integrate these searches in a common query-by-example paradigm. We aim at managing the metadata related to the IPR in both centralized and Peer-to-Peer systems with metric indexing capabilities. Together with content-based similarity search, IPR similarity search can help the end user to deal with a huge amount of similar items with different licenses. Moreover, content providers may be able to detect fake copies or illegal uses. Two use cases, related to the retrieval of music and images respectively, are presented to describe the possible applications of the approach
Dipyrromethane based receptors for anions
No full textThis thesis is principally concerned with the synthesis of a range of dipyrromethane based
receptors and their ability to bind anions, in particular carboxylates of amino acid
derivatives.Chapter I provides a general introduction to the field of Supramolecular Chemistry and its
applications. In this chapter a series of receptors for anions are presented their properties
discussed. A particular attention is given to the aromatic heterocycles based receptors and
to enantioselective receptors.Chapter II describes the synthesis of a series of acyclic receptors which are the results of
subsequent modifications of a simple tweezer, based on a dipyrromethane unit coupled
with two butyl amines, previously studied by the group.1 The binding properties with a
series of anions are presented and, for the chiral receptors, the binding properties with Nprotected
amino acids were investigated.Chapter III describes the synthesis and the binding properties of a series of macrocycles
obtained by modifications of the tweezer receptors. The binding properties of the
macrocyclic receptors with a series of anions and amino acids are also presented
Audio-visual content analysis in P2P: the SAPIR approach
No full textContent based search in audio-visual collections requires media specific analysis for extracting low level features to be efficiently indexed and searched. We present the SAPIR media framework for analyzing digital content and representing the extracted features in a common schema. The framework contains splitters of compound objects to simple objects to deal with complex media like videos, using image and speech analyzers. The extracted features are then merged into a common representation. We report usage of this framework in the SAPIR demo
Precision measurement of structure function ratios for Li-6, C-12 and Ca-40
No full textAmaudruz P, Arneodo M, Arvidson A, et al. Precision measurement of structure function ratios for Li-6, C-12 and Ca-40. Z.Phys. C. 1992;53(1):73-77.The structure function ratios F2C/F2Li, F2Ca/F2Li and F2Ca/F2C were measured in deep inelastic muon-nucleus scattering at an incident muon energy of 90 GeV, covering the kinematic range 0.0085 < x < 0.6 and 0.8 < Q2 < 17 GeV2. The sensitivity of the nuclear structure functions to the size and mean density of the target nucleus is discussed
Pale obciążone poziomo w nawodnionym fliszu karpackim
No full textIn this paper, flysch is presented as a representative material of a wide section of the Carpathian Mountains, with some areas in Poland highlighted. The geological structure of this area is complex due to the alternating layers of blocky rock masses and soil (Vessia et al., 2017). Such a complex pattern is seen in some Alpine flysch slopes, such as the Ingelsberg landslide area (Romeo et al., 2015). Many authors are monitored, predicted landslides (Allasia et al., 2013; Bertacchini et al., 2009; Casagli et al., 2010) by sophisticated sensors. The rock-soil flysch successions have become intensively fissured as a result of their geological history, weathering (precipitation and snowmelt), and long-term water retention, especially on the surface layers. These complex materials are characterised by heterogeneous lithologies, whose mechanical properties are largely uncertain. These geological structures have also been confirmed by monitoring and control studies performed on a large number of landslides (Bednarczyk, 2014). One of the most striking phenomena is the sudden decrease in the strength parameters in the studied rocks in the direction parallel to the layers due to watering. The process is made possible by heterogeneous fractured strong rock layers with high permeability coefficients for water. This study precisely describes the phenomena occurring at the contact area between the component layers of flysch under the wet conditions of a weak plane. An elastic-plastic analysis method that considers the developed strength model at the surfaces of the contact areas (Biernatowski & Pula, 1988; Pula, 1997) has been used to estimate the load capacity for piles working under a horizontal load. The piles are part of a reliability chain (Pula, 1997) in a given construction and are the first element of concern for monitoring (Muszynski & Rybak, 2017). A particular device intended to study the dependence of the shear stress on a fixed failure surface in a controlled consolidation condition was utilized. The study was conducted for a wide range of displacements and for different values of stabilized vertical stresses of consolidation. The complexity of the processes occurring in the shear zone, presented as a detailed study of the material crack mechanics, is highlighted. The laboratory results were used to construct the mechanical model of the slip surface between the soil and rock with the description supported by a neural network (NN) approximation. The artificial NN was created as a multi-layered, easy to use approach for interpreting results and for quick reconstruction of approximated values useful for the calculations presented in laterally loaded piles. For the calculations, long, sheared strips of material were considered in a semi-analytical procedure to solve a differential equation of stability. The calculations are intended to reveal the safety indexes for a wide range of boundary tasks as the most significant indicator for design decisions.Flisz karpacki jest formacją występującą na znacznym obszarze Europy Środkowej, stwarza znaczne zagrożenie podczas nawodnienia np. przez infiltrację wody deszczowej lub awarię drenażu. Dla opisu zniszczenia tego materiału o regularnej strukturze z naprzemiennie ułożonych warstw słabych i mocnych, przedstawiono model. Jest to dogodna do zastosowania koncepcja, zaprezentowana w zadaniu stateczności poziomo obciążonych pali. Model można stosować dla szerokiego zakresu skłonu warstw jak i sposobu powiązania głowic pali z oczepem. Ważnym elementem pracy jest opis powierzchni poślizgu między warstwami z zastosowaniem wyników badań laboratoryjnych na próbkach gruntów zarówno sztucznie wytworzonych, jak i pobranych z osuwisk. Badania przeprowadzono w zmodyfikowanym obrotowym aparacie bezpośredniego ścinania. Przykłady obliczeniowe ilustrują procedury modelowania dla słabych skał wraz z ich interpretacją
Measurement of the neutron and the proton F2 structure function ratio
No full textAllasia D, Amaudruz P, Arneodo M, et al. Measurement of the neutron and the proton F2 structure function ratio. Phys.Lett. B. 1990;249(2):366-372
100 Million Hours of Audiovisual Content: Digital Preservation and Access in the PrestoPRIME Project
No full textWe report the preliminary results of PrestoPRIME, an EU FP7 integrated project, including audiovisual (AV) archives, academics and industrial partners, focused on long-term digital preservation of AV media objects and on ways to increase access by integrating media archives with European on-line digital libraries, specifically Europeana. Project outcomes will result in tools and services to ensure the permanence of digital AV content in archives, libraries, museums and other collections, enabling long-term future access in dynamically changing contexts. PrestoPRIME has a special focus on digital preservation in broadcast environments, where very large files of digital video must be preserved at high quality (suitable for future re-use in an AV production environment) in affordable distributed and federated archives. The adoption of standard solutions for digital preservation processes (metadata representation, content storage, digital rights government, search and access) enables the interoperability of the proposed preservation framework and guidelines. OAIS model was chosen for the reference architecture, METS is adopted as wrapper for metadata representation, while relevant standards (e.g. W3C, ISO/IEC and others) are used for content and rights description. Project outcomes will be delivered through a European networked Competence Centre, to gather knowledge and deliver advanced digital preservation advice and services in conjunction with Europeana and other initiatives
- …
