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Search Results: 1 - 10 of 208484 matches for " L. Sansoni "
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Experimental quantum process tomography of non trace-preserving maps
I. Bongioanni,L. Sansoni,F. Sciarrino,G. Vallone,P. Mataloni
Physics , 2010, DOI: 10.1103/PhysRevA.82.042307
Abstract: The ability of fully reconstructing quantum maps is a fundamental task of quantum information, in particular when coupling with the environment and experimental imperfections of devices are taken into account. In this context we carry out a quantum process tomography (QPT) approach for a set of non trace-preserving maps. We introduce an operator $\OO$ to characterize the state dependent probability of success for the process under investigation. We also evaluate the result of approximating the process with a trace-preserving one.
Experimental Quantum Private Queries with linear optics
F. De Martini,V. Giovannetti,S. Lloyd,L. Maccone,E. Nagali,L. Sansoni,F. Sciarrino
Physics , 2009,
Abstract: The Quantum Private Query is a quantum cryptographic protocol to recover information from a database, preserving both user and data privacy: the user can test whether someone has retained information on which query was asked, and the database provider can test the quantity of information released. Here we introduce a new variant Quantum Private Query algorithm which admits a simple linear optical implementation: it employs the photon's momentum (or time slot) as address qubits and its polarization as bus qubit. A proof-of-principle experimental realization is implemented.
Evaluation of Surface Slope Irregularity in Linear Parabolic Solar Collectors
F. Francini,D. Fontani,P. Sansoni,L. Mercatelli,D. Jafrancesco,E. Sani
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/921780
Abstract: The paper describes a methodology, very simple in its application, for measuring surface irregularities of linear parabolic collectors. This technique was principally developed to be applied in cases where it is difficult to use cumbersome instruments and to facilitate logistic management. The instruments to be employed are a digital camera and a grating. If the reflector surface is defective, the image of the grating, reflected on the solar collector, appears distorted. Analyzing the reflected image, we can obtain the local slope of the defective surface. These profilometric tests are useful to identify and monitor the mirror portions under mechanical stress and to estimate the losses caused by the light rays deflected outside the absorber.
Pointing Sensors and Sun Tracking Techniques
D. Fontani,P. Sansoni,F. Francini,D. Jafrancesco,L. Mercatelli,E. Sani
International Journal of Photoenergy , 2011, DOI: 10.1155/2011/806518
Abstract: Every optical system for sunlight concentration requires following the sun in its movement. The sun tracking method is essentially chosen on the base of collection geometry and optical system configuration. A simple, useful, and original technique to realise sun tracking is proposed. It is based on a double guiding system using two complementary procedures. A passive tracking device performs a preliminary collector orientation. Then an active tracking system realises its fine positioning and adjustments exploiting an optical pointing sensor. The core of this active tracking device is the sun finder. Pointing sensors for fibre-coupled, CPV (Concentrating Photo voltaic), and linear collectors are presented, illustrating in detail the working principle and practical use. All sensors were optically characterised in laboratory, under controlled and reproducible conditions. Some field tests completed the experimentation evaluating the sensors performance in outdoor working conditions. 1. Introduction Tracking the movement of the sun is a strategy to enhance the performance of solar photovoltaic plants. Using plane Photo voltaic (PV) panels, the required pointing precision is of the order of few angular degrees; hence it is sufficient to drive the motors dedicated to orient the PV panels, using a software taking into account sun’s ephemerides during the arc of the year [1–6]. More simplified guiding systems rotate the solar panel only in one direction, during the whole day, while the inclination over the horizon is kept constant and equal to the mean value of solar annual elevation. In Concentrating PhotoVoltaic (CPV) plants that, on the contrary, can work only with direct sunlight, it is necessary to employ an optical pointing system. In these devices, the central optical component typically is a Fresnel lens or a parabolic concentrator and some secondary optical elements could be added to improve pointing precision and plant collection efficiency. Maintaining aligned the optical system with the sun’s position requires an angular precision higher than the tenth of degree. This accuracy is not realisable using a passive driving device due to problems connected to the plant orientation, difficulties in keeping a high mechanical stability, wind action, and the precision required by the type of concentrator in use. For these reasons, it is not sufficient to use only the alignment technique based on the ephemerides; so the solar plants usually employ an additional device devoted to supply to the moving system the information necessary to correct the concentrators’
Polarization entangled state measurement on a chip
L. Sansoni,F. Sciarrino,G. Vallone,P. Mataloni,A. Crespi,R. Ramponi,R. Osellame
Physics , 2010, DOI: 10.1103/PhysRevLett.105.200503
Abstract: The emerging strategy to overcome the limitations of bulk quantum optics consists of taking advantage of the robustness and compactness achievable by the integrated waveguide technology. Here we report the realization of a directional coupler, fabricated by femtosecond laser waveguide writing, acting as an integrated beam splitter able to support polarization encoded qubits. This maskless and single step technique allows to realize circular transverse waveguide profiles able to support the propagation of Gaussian modes with any polarization state. Using this device, we demonstrate the quantum interference with polarization entangled states and singlet state projection.
Río arriba, río abajo. La literatura de viajes y la exploración de los ríos interiores, Orinoco, Bermejo y Pilcomayo
Ileana Mariela Sansoni
Revista Theomai , 2001,
Abstract: Desde la segunda mitad del siglo XIX, la consolidación de los estados nacionales pasó por la ocupación de los territorios nacionales ?vacíos?. La navegación y la exploración de los ríos que unen las tierras interiores con el océano era un viejo proyecto que databa de tiempos coloniales. Mientras los países americanos se vinculaban con el mercado internacional, el control de los territorios vírgenes se aceleró; la ocupación marginal de dichos territorios mostraba las grandes esperanzas despertadas por la expansión de las relaciones capitalistas. La visión de Humbolt de América como un territorio de naturaleza exuberante donde se desarrollaría la civilización en el futuro sigue siendo el paradigma de los libros de viajeros; este tipo de libros son algo así como los cuentos sobre la explotación imperialista de áfrica; ello no es en modo alguno casual, ya que el Chaco Gualamba y el Orinoco estaban escondidos y debían ser conectados al mercado internacional al igual que todas las recónditas tierras interiores del mundo.
Herlyn-werner-wunderlich syndrome: MRI findings, radiological guide (two cases and literature review), and differential diagnosis
Riccardo Del Vescovo, Sofia Battisti, Valerio Di Paola, Claudia L Piccolo, Roberto L Cazzato, Ilaria Sansoni, Rosario F Grasso, Bruno Zobel
BMC Medical Imaging , 2012, DOI: 10.1186/1471-2342-12-4
Abstract: two cases of HWW syndrome in adolescents and a differential diagnosis for one case of a different MDA, and the impact of magnetic resonance (MR) imaging technology to achieve the correct diagnosis.MR imaging is a very suitable diagnostic tool in order to perform the correct diagnosis of HWW syndrome.The association of renal agenesis with ipsilateral blind hemivagina and didelphys uterus is reported as Herlyn-Werner-Wunderlich (HWW) syndrome; this triad was initially disclosed in an English report published in 2006 [1].The incidence of didelphys uterus, related to HWW, is approximately 1/2,000 to 1/28,000, and it is accompanied by unilateral renal agenesis in 43% of cases. The incidence of unilateral renal agenesis is 1/1,100, and 25-50% of affected women exhibits associated genital abnormalities [2].HWW syndrome represents a type of Müllerian duct anomalies (MDA) associated with mesonephric duct anomalies. MDA are congenital entities resulting from non-development (agenesia or hypoplasia), defective vertical or lateral fusion, or resorption failure of the Müllerian (paramesonephric) ducts [3].MDA are estimated to have an overall prevalence of 2% to 3% among all women, with an incidence of 1/200-600 among fertile women. Hypoplasia, as well as agenesis of the uterus and proximal vagina, accounts for 5%-10% of Müllerian duct anomalies, whereas didelphys uterus accounts for approximately 11% of Müllerian duct anomalies. Renal tract anomalies are associated with MDA in as many as 30% of cases [4].A complete or partial vaginal septum is present in 75% of women with didelphys uterus [5].The exact cause, pathogenesis and embryologic origin of HWW syndrome are unclear and remain a subject of discussion [6].HWW syndrome is usually discovered at puberty with non-specific symptoms, like increasing pelvic pain, dysmenorrhea and palpable mass due to the associated haematocolpos or hematometra, which result from retained, longstanding menstrual flow in the obstrucucted vagina.It r
General rules for bosonic bunching in multimode interferometers
N. Spagnolo,C. Vitelli,L. Sansoni,E. Maiorino,P. Mataloni,F. Sciarrino,D. J. Brod,E. F. Galvao,A. Crespi,R. Ramponi,R. Osellame
Physics , 2013, DOI: 10.1103/PhysRevLett.111.130503
Abstract: We perform a comprehensive set of experiments that characterize bosonic bunching of up to 3 photons in interferometers of up to 16 modes. Our experiments verify two rules that govern bosonic bunching. The first rule, obtained recently in [1,2], predicts the average behavior of the bunching probability and is known as the bosonic birthday paradox. The second rule is new, and establishes a n!-factor quantum enhancement for the probability that all n bosons bunch in a single output mode, with respect to the case of distinguishable bosons. Besides its fundamental importance in phenomena such as Bose-Einstein condensation, bosonic bunching can be exploited in applications such as linear optical quantum computing and quantum-enhanced metrology.
State-of-The-Art and Applications of 3D Imaging Sensors in Industry, Cultural Heritage, Medicine, and Criminal Investigation
Giovanna Sansoni,Marco Trebeschi,Franco Docchio
Sensors , 2009, DOI: 10.3390/s90100568
Abstract: 3D imaging sensors for the acquisition of three dimensional (3D) shapes have created, in recent years, a considerable degree of interest for a number of applications. The miniaturization and integration of the optical and electronic components used to build them have played a crucial role in the achievement of compactness, robustness and flexibility of the sensors. Today, several 3D sensors are available on the market, even in combination with other sensors in a “sensor fusion” approach. An importance equal to that of physical miniaturization has the portability of the measurements, via suitable interfaces, into software environments designed for their elaboration, e.g., CAD-CAM systems, virtual renders, and rapid prototyping tools. In this paper, following an overview of the state-of-art of 3D imaging sensors, a number of significant examples of their use are presented, with particular reference to industry, heritage, medicine, and criminal investigation applications.
Experience of a Single Center in the Diagnosis and Classification of Cases of Left Ventricular Noncompaction  [PDF]
Roberta Martinoli, Patrizia Saccucci, Federica Papetti, Alessandro Dofcaci, Stefano Piccirilli, Ilaria Sansoni, Francesca Ianniello, Federica Ferrante, Maria Banci
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.64029
Objectives: To analyse the clinical profile of consecutive cases of Left Ventricular Non Compaction (LVNC) with particular interest in non-compacted segments valuation. Methods: There were 18,000 patients seen from 2007 to 2010, with a complete evaluation including family history and personal cardiac history, clinical examination and electrocardiography. Diagnosis was based on three published definitions. Results: The diagnosis of LVNC was placed in 1.4% of cases. Clinical and echo-cardiographic data for the 250 cases of LVNC are presented. Trabecular meshwork was observed predominantly at the apex (91.6%), in the lateral and inferior wall (40.4% and 38.0% respectively), and less frequently in the posterior and anterior wall (21.6% and 9.2% respectively). Conclusions: This study suggests that LVNC is a form of cardiomyopathy with higher prevalence and relatively better prognosis than previously reported.
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