Hardy's nonlocality for generalized n-particle GHZ states

In this paper we extend Hardy's nonlocality proof for two spin-1/2 particles [PRL 71 (1993) 1665] to the case of n spin-1/2 particles configured in the generalized GHZ state. We show that, for all n \geq 3, any entangled GHZ state violates the Bell inequality associated with the Hardy experiment. This feature is important since it has been shown [PRL 88 (2002) 210402] that, for all n odd, there are entangled GHZ states that do not violate any standard n-particle correlation Bell inequality.Comment: LaTeX file, 8 pages, 2 eps figures; journal versio

Engene: A genetic algorithm classifier for content-based recommender systems that does not require continuous user feedback

We present Engene, a genetic algorithm based classifier which is designed for use in content-based recommender systems. Once bootstrapped Engene does not need any human feedback. Although it is primarily used as an online classifier, in this paper we present its use as a one-class document batch classifier and compare its performance against that of a one-elms k-NN classifier

Greenberger-Horne-Zeilinger paradoxes for many qudits

We construct GHZ contradictions for three or more parties sharing an entangled state, the dimension d of each subsystem being an even integer greater than 2. The simplest example that goes beyond the standard GHZ paradox (three qubits) involves five ququats (d=4). We then examine the criteria a GHZ paradox must satisfy in order to be genuinely M-partite and d-dimensional.Comment: 5 pages RevTe

Αναγκαιότητα και σχεδιασμός μιας καλωδιωμένης πολυπαραμετρικής πλατφόρμας οργάνων για μεγάλα θαλάσσια βάθη

76 σ.Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Ναυτική και Θαλάσσια Τεχνολογία και Επιστήμη”Η παρούσα διπλωματική έχει σαν σκοπό μια προτεινόμενη αρχιτεκτονική κατασκευής ενός πολυπαραμετρικού παρατηρητηρίου για μεγάλα βάθη στην περιοχή ΝΔ της Πελοποννήσου μέσα από την παρουσίαση των υπαρχόντων συστημάτων παρακολούθησης του βενθοπελαγικού οικοσυστήματος και βιοποικιλότητας, των επικίνδυνων γεωλογικών και γεωφυσικών φαινομένων όπως σεισμοί, υποθαλάσσιες κατολισθήσεις, κυμάτων tsunami, την επίδραση των κλιματικών αλλαγών και πως αυτές επιδρούν στο βαθύ υδρολογικό περιβάλλον και το οικοσύστημα, την υδροακουστική και βιοακουστική παρατήρηση πελαγικών ιχθυοπληθυσμών και θαλάσσιων θηλαστικών με έμφαση στην αναγκαιότητα ύπαρξης τους για συνεχείς μετρήσεις και τροφοδοσία σε μοντέλα ανάλυσης και πρόβλεψης για μια πληρέστερη και αξιόπιστη αποτίμηση των περιβαλλοντικών αλλαγών. Η διπλωματική κινείται μέσα στα πλαίσια αρχιτεκτονικής όπως αυτά διαγράφονται από την Ευρωπαϊκή υποδομή EMSO για υποθαλάσσια συστήματα μακροχρόνιας παρατήρησης και αποστολής δεδομένων σε πραγματικό χρόνο.An architectural recommendation for the realisation of a multiparametric deep sea observatory in the area South West of the Peloponese guided within the framework of the EMSO for long term, real time, monitoring.Παρασκευάς Ν. Παγώνη

Open type ferry safety systems design for using LNG fuel

This feasibility study investigates the viability of employing Liquefied Natural Gas (LNG) fuel to an open type Ro-Ro passenger ferry and the potential challenges imposed with regard to the vessel safety systems. The study proposes appropriate methodology for converting the existing ship to run on LNG fuel and discusses all the necessary modifications to the ship’s safety systems; furthermore, the ship’s evacuation analysis is investigated accordingly. The basic requirements that the ship already complies with are initially reported for each safety system while the additional restrictions that need to be taken into consideration for employing LNG fuel are analysed; appropriate actions are proposed. Furthermore, a Hazard Identification Study (HAZID) is also carried out. Overall, the technical feasibility of the investigated scenario is clearly demonstrated; minimal modifications to the ship's safety systems in order to comply with the imposed safety rules are required for the specific type of ship

Radiation-induced growth and isothermal decay of infrared-stimulated luminescence from feldspar

Optically stimulated luminescence (OSL) ages can determine a wide range of geological events or processes, such as the timing of sediment deposition, the exposure duration of a rock surface, or the cooling rate of bedrock. The accuracy of OSL dating critically depends on our capability to describe the growth and decay of laboratory-regenerated luminescence signals. Here we review a selection of common models describing the response of infrared stimulated luminescence (IRSL) of feldspar to constant radiation and temperature as administered in the laboratory. We use this opportunity to introduce a general-order kinetic model that successfully captures the behaviour of different materials and experimental conditions with a minimum of model parameters, and thus appears suitable for future application and validation in natural environments. Finally, we evaluate all the presented models by their ability to accurately describe a recently published feldspar multi-elevated temperature post-IR IRSL (MET-pIRIR) dataset, and highlight each model's strengths and shortfalls

Techno-economic investigation of alternative propulsion plants for ferries and RoRo ships

In this paper, the main alternative propulsion plants based on reciprocating internal combustion engines of a ferry or RoRo ship operating in routes that include Emission Control Areas (ECAs) are comparatively assessed. Specifically, a dual fuel engine propulsion plant is compared with a conventional Diesel engine plant. For both cases, the installation of a Waste Heat Recovery system, which covers a part of the ship electric energy demand, is also considered. The ship main DF engines are assumed to operate using LNG and a small amount of MDO for initiating combustion, whereas low sulphur MDO was regarded as the fuel for the case of the Diesel engine plant. The installation of selective catalytic reduction (SCR) after-treatment unit for reducing the NOx emissions for the case of Diesel engines plant is also taken into account. The propulsion plants were modelled under steady state conditions, and the simulation results were analysed in order to compare the alternative configurations. Furthermore, the energy efficiency design index (EEDI) values were calculated and the two examined propulsion system cases were compared on EEDI basis. Finally, the Life Cycle Cost for each alternative propulsion plant was calculated and used for completing an economic evaluation of the Dual fuel propulsion plant versus the conventional designs applied in ferries

The EGIM, modular though generic addresses the requirements of the EMSO platforms

The EGIM (EMSO Generic Instrument Module ) is designed to consistently and continuously measure parameters of interest for most major science areas covered by EMSO. This research infrastructure provides accurate records on marine environmental changes from distributed regional nodes around Europe. The system can deliver data that can support the Global Ocean Observing System –Essential Ocean Variables concept, as well as the Marine Strategy Framework Directive towards evaluating environmentalstatus. The EGIM is flexible for adaptation according to site and disciplinespecific requirements. Inter - operability and capacity of future evolution of the system are key aspects of the modularity. The EGIM is able to operate on any EMSO node type: mooring line, sea bed station, cabled or non - cabled and surface buoy to monitor environmental parameters over a wide depth range. Operating modes, power requirements, mechanical design can adapt to the various EMSO node configurations. In addition to sensors already included in the EGIM prototype (temperature, conductivity, pressure, dissolved Oxygen, Turbidity, currents and passive acoustics) the EGIMcan host up to five additional sensors such as chl -a, pCO 2, pH, seismic and photographic/video images ornew sensors. The EGIM provides all the sensor hosting services required ,for instance power distribution, positioning , and protection against bio -fouling . Within EMSO , the EGIM aimsto have a number of ocean locations where the same set of core variables are measured homogeneously: using the same hardware, same sensor references, same qualification methods, same calibration methods, same data format and access and the same maintenance procedures. It’s compact and modular nature allows for flexible deploymentscenarios that include being able to accommodate new instruments such for Essential Ocean Variables and other needs as theirtechnology readiness levels improve.Peer ReviewedPostprint (published version

Greenberger-Horne-Zeilinger paradox for continuous variables

We show how to construct states for which a Greenberger-Horne-Zeilinger type paradox occurs if each party measures either the position or momentum of his particle. The paradox can be ascribed to the anticommutation of certain translation operators in phase space. We then rephrase the paradox in terms of modular and binary variables. The origin of the paradox is then due to the fact that the associativity of addition of modular variables is true only for c-numbers but does not hold for operators.Comment: 4 pages, no figure

Multiparty multilevel Greenberger-Horne-Zeilinger states

The proof of Bell's theorem without inequalities by Greenberger, Horne, and Zeilinger (GHZ) is extended to multiparticle multilevel systems. The proposed procedure generalizes previous partial results and provides an operational characterization of the so-called GHZ states for multiparticle multilevel systems.Comment: REVTeX, 5 pages, 1 figur