177 research outputs found
Laser based observation of space debris: Taking benefits from the fundamental wave
No full textAfter the successful experimental demonstration of the prior published concept on laser-based monitoring of space debris in early 2012, we will present further technological and conceptual advancements of this position sensing scheme. The laser based measurement of LEO space debris positions in general offers the potential of a very high accuracy on the order of 10 meters in 3D, which in turn is the input for orbit processing of objects which are seemingly on collisional course.
We argue that it is beneficial for the photon budget to make use of the so called fundamental wave, which is present in frequency doubled laser systems anyway. Thus, the here proposed move to near infrared wavelength is technologically easy to achieve and promising towards an operational laser-based debris ranging and tracking system
La mauresque sur scène et les contacts musico-teatraux entre l'Italie et la ville de Dubrovnik au XVIe siècle
No full textThe moresca, and the related forms of weapon dance, either spread in the Mediterranean basin or in several countries of Central and Southern Europe, was a kind of 16-century choreography. Born as a battle between Saracens and Christian knights, this dance inspired different kinds of mimic spectacle that served as a part of comedies and pastoral plays.
The article analyses the relationship between the moresca intermingled in the pastorals of Dubrovnik and Siena, both marked by a strong presence of dances, songs and choruses to increase the fantastic and sentimental emphasis of the performances.
Both Dubrovnik’s and Italian’s plays were characterized by shepherds, nymphs, and rustic men (the Croatian vlasi, i.e., Walachians or Morlacks), as well as fantastic and comic elements. Like in Sienese dramaturgy, the music in Croatian pastorals supports a narrative function. It serves as a guide through the development of the plot, namely in some pieces by Nikola Naljeskovic and Marin Drzic. At salient points, they insert choruses or mimic scenes in the vein of Sienese moresca. In what is concerned the instruments played to accompany pantomimes or songs, only rarely there are quotations in courtly form. Actually, the terms taken from Slavic folklore prevail, even though the music on stage was played by the consort
Space QUEST mission proposal: Experimentally testing decoherence due to gravity
No full textModels of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that quantum correlations, such as entanglement, may exhibit different behavior to purely classical correlations in curved space. By measuring this effect or lack thereof, we can test the hypotheses behind several such models. For instance, as predicted by Ralph et al [5] and Ralph and Pienaar [1], a bipartite entangled system could decohere if each particle traversed through a different gravitational field gradient. We propose to study this effect in a ground to space uplink scenario. We extend the above theoretical predictions of Ralph and coworkers and discuss the scientific consequences of detecting/failing to detect the predicted gravitational decoherence. We present a detailed mission design of the European Space Agency's Space QUEST (Space-Quantum Entanglement Space Test) mission, and study the feasibility of the mission scheme
Socratenon and its application to the learning of Italian language
No full textSocratenon is a Web engine tuned to advanced Web education using the state-of-the-art Internet development technologies and tools. It enables interactive and creative learning/teaching management in four different domains (provider, administrator, teacher, and student). It also includes an interface to an artificial intelligence based tool for off-line improvement or learning curricula (ABITS or Aristotelon). One of the first applications of Socratenon was to help the learning of Italian language for Serbian students (the product was developed through a cooperation between universities in Salerno and Belgrade). This paper presents the basic elements of the Socratenon application and implementation philosophy, and discusses its possibilities in the general language- learning environment. It describes three different experiments and explains the lessons learned. The stress is on the statistical analysis of success of those who used our Web-based product and those who relied on the classical approaches
Performance of the NOMAD-STAR detector
No full textThe NOMAD-STAR detector is a silicon vertex detector installed in the NOMAD spectrometer at the CERN SPS neutrino beam. It consists of four layers of a passive boron carbide target with a total mass of 45 kg and five layers of 600 single-sided silicon microstrip detectors covering a total area of 1.14 m<sup>2</sup>. About 11,500 ν<sub>μ</sub> charged current interactions were reconstructed in the fiducial volume of NOMAD-STAR from the neutrino run in 1998. The potential use of silicon detectors for ν<sub>μ</sub>(ν<sub>e</sub>) lt - gt ν<sub>τ</sub> oscillations depends on the observation of the τ candidates by the experimental signature of a large impact parameter, in the case of the one prong decay of the τ, or a double vertex, in the case of the three prong decay. The main aim of NOMAD-STAR is to measure the impact parameter and vertex distributions of charged current interactions, which constitute the main backgrounds for the oscillation signals, to understand the significance of a potential signal in a future experiment. The present paper describes the experience gained in the operation of this silicon vertex detector, and the performance achieved with it
Entanglement distribution quantum networking within deployed telecommunications fibre-optic infrastructure
No full textQuantum networks have been shown to connect users with full-mesh topologies without trusted nodes. We present advancements on our scalable polarisation entanglement-based quantum network testbed, which has the ability to perform protocols beyond simple quantum key distribution. Our approach utilises wavelength multiplexing, which is ideal for quantum networks across local metropolitan areas due to the ease of connecting additional users to the network without increasing the resource requirements per user. We show a 10 user fully connected quantum network with metropolitan scale deployed fibre links, demonstrating polarisation stability and the ability to generate secret keys over a period of 10.8 days with a network wide average-effective secret key rate of 3.38 bps
Electrochemical Approaches Employed For Sensing The Antioxidant Capacity Exhibited By Vegetal Extracts: A Review
No full textVegetal extracts are among the most important source of polyphenols in the diet, highlighting the importance of their characterization and determination. For this reason, analytical methods have gained increasing interest, with many publications devoted to this subject. Among the wide possibilities of analytical methods, electroanalytical techniques can provide valuable information, since the antioxidant activity of polyphenols is related to their electrochemical properties. This review analyzes and highlights the role of electroanalytical approaches for sensing the antioxidant capacity exhibited by vegetal extracts, as well as focuses on their importance for human health. 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"Daleki svijet muzikom dokuěen"("A distant world touched by music"): a contextual and critical study of Yugoslavian music as exemplified in the life and music of Josip Stolcer Slavenski (1896-1955)
No full textThe core of this study is a contextual, critical and analytical study of the life and work of Josip Stolcer Slavenski (1886-1955). It consists of a brief outline of nineteenth-century socio-political, cultural and musical trends in the former Yugoslavia which serves as a broader context for the period of Moderna (avant-garde). This movement, which attempted to embrace new ideas and developments of mainstream western Europe, emerged at the end of the nineteenth century and played a major role in Slavenski's musical development. Parucular reference to Slavenski's circumstances are examined in the biographical chapter and his periods of study in Budapest, Prague and Paris are discussed, as is the important recognition of his music at the Donaueschingen Festival in the 1920s, and how the changing political climate of Yugoslavia, from monarchy to republic, influenced Slavenski's political and national affiliations. With this contextual backdrop, which includes reference to a number of Slavenski's contemporaries - namely Kodaly, Bartok, Suk, Novak, Hindemith, composers of the Second Viennese School, and his own Croatian, Serbian and Slovenian compatriots, the dissertation focusses on particular aspects of Slavenski's work with special emphasis on his use of Balkan folk music, his autodidactic theories of 'Astroacoustics', the expressionist fabric of his music, and the socialist realism of his later works during the 1940s and 1950s.In attempting to illuminate the nature of the 'Slavenski phenomena', this work also offers certain suggestions as to what might have been the reasons for the neglect and creative aridity of his later years. Furthermore, it is hoped that the conclusions of this study may in themselves provide an impetus for further research into Slavenski's work which has received little attention in English-speaking musicology
Performance of long modules of silicon microstrip detectors
No full textThis note describes the performance of modules assembled with up to 12 silicon microstrip detectors. These modules were built for the instrumented Silicon Target (STAR) that has been installed in the NOMAD spectrometer. Laboratory and test beam results are compared with model predictions. For a module of nine detectors, test beam results indicate a signal-to-noise ratio of 19, a hit finding efficiency of 99.8% and a spatial resolution of 6.0 μm. Laboratory measurements indicate that modules of twelve detectors exhibit a signal-to-noise ratio of the order of 16
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