cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geodesics with negative energy in the ergosphere of rotating black holes
Creators: name: Grib, A. A.
name: Pavlov, Yu. V.
name: Vertogradov, V. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown that the geodesics with negative energy for rotating black holes cannot originate or terminate inside the ergosphere. Their length is always finite and this leads to conclusion that they must originate and terminate inside the gravitational radius of the ergosphere.
description: 9 pages, no figures, published version
title: Στάσεις και συμπεριφορές στελεχών υγείας για την εξ αποστάσεως εκπαίδευση
Creators: name: Φασουλά Ελένη
Publisher: name: Technical University of Crete
Year: 2010

description: Κεφ. 1: Συμβατική και ανοικτή εξ αποστάσεως εκπαίδευση -- Κεφ. 2: Ανοικτή εξ αποστάσεως εκπαίδευση -- Κεφ. 3: Στάσεις και συμπεριφορές στελεχών υγείας για την εξ αποστάσεως εκπαίδευση -- Κεφ. 4: Στατιστική ανάλυση Ι -- Κεφ. 5: Στατιστική ανάλυση ΙΙ
title: Serious Injury Determinations for Small Cetaceans off the Southeast U.S. Coast, 2015–2019
Creators: name: Maze-Foley, Katherine
name: Garrison, Lance P.
Publisher: name: Southeast Fisheries Science Center (U.S.)
Year: 2021

description: Southeast Fisheries Science Center reference document PRBD ; 2021-03
description: The Marine Mammal Protection Act (MMPA) requires NOAA's National Marine Fisheries Service (NMFS) to distinguish between injuries to marine mammals that are serious and not serious. During 2012 NMFS issued a policy directive and procedural directives to establish a process for distinguishing serious from non-serious injuries (NMFS 2012a, b). This document summarizes serious injury determinations for small cetaceans in southeast U.S. waters during 2015–2019.
title: Μηχανιστική μελέτη της καταλυτικής υγρής οξείδωσης του βενζοϊκού οξέος με ιόντα χαλκού
Creators: name: Κατσώνη Αθανασία
Publisher: name: Technical University of Crete
Year: 2010

description:  Κεφάλαιο -- 2. Ένυδρη καταλυτική οξείδωση - Catalytic wet air oxidation (CWAO)
Simple Stochastic Modeling of Snowball Probability Throughout Earth History
Creators: name: Baum, Mark
name: Fu, Minmin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Over its multibillion-year history, Earth has exhibited a wide range of climates. Its history ranges from snowball episodes where the surface was mostly or entirely covered by ice to periods much warmer than today, where the cryosphere was virtually absent. Our understanding of greenhouse gas evolution over this long history, specifically carbon dioxide, is mainly informed by deterministic models. However, the complexity of the carbon cycle and its uncertainty over time motivates the study of non-deterministic models, where key elements of the cycle are represented by inherently stochastic processes. By doing so, we can learn what models of variability are compatible with Earth's climate record instead of how exactly this variability is produced. In this study, we address why there were snowballs in the Proterozoic, but not the Phanerozoic by discussing two simple stochastic models of long-term carbon-cycle variability. The first, which is the most simple and represents CO2 concentration directly as a stochastic process, is instructive and perhaps intuitive, but is incompatible with the absence of snowballs in the Phanerozoic. The second, which separates carbon source from sink and represents CO2 outgassing as a stochastic process instead of concentration, is more flexible. When outgassing fluctuates over longer periods, as opposed to brief and rapid excursions from a mean state, this model is more compatible with the snowball record, showing only modest increases in the probability of snowball events over Earth history. The contrast between these models illustrates what kind of variability may have characterized the long-term carbon cycle.
description: accepted at Geochemistry, Geophysics, Geosystems
Exploring ν_τ- ν_s mixing with cascade events in DeepCore
Creators: name: Esmaili, Arman
name: Halzen, Francis
name: Peres, O. L. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The atmospheric neutrino data collected by the IceCube experiment and its low-energy extension DeepCore provide a unique opportunity to probe the neutrino sector of the Standard Model. In the low energy range the experiment have observed neutrino oscillations, and the high energy data are especially sensitive to signatures of new physics in the neutrino sector. In this context, we previously demonstrated the unmatched potential of the experiment to reveal the existence of light sterile neutrinos. The studies are routinely performed in the simplest 3+1 model concentrating on disappearance of muon neutrinos of TeV energy as a result of their mixing with a sterile neutrino. We here extend this analysis to include cascade events that are secondary electromagnetic and hadronic showers produced by neutrinos of all flavors. We find that it is possible to probe the complete parameter space of 3+1 model, including the poorly constrained mixing of the sterile neutrino to tau neutrinos. We show that $ν_τ-ν_s$ mixing results into a unique signature in the data that will allow IceCube to obtain constraints well below the current upper limits.
description: 20 pages, 9 figures; v2: several clarifications added, matches published version at JCAP
title: Εργασία και τεχνολογία στη διάρθρωση της κοινωνίας
Creators: name: Φαγογένης Κώστας
Publisher: name: Technical University of Crete
Year: 2008

description:  Ζητήματα μεθοδολογίας: από τον κλασσικό μαρξισμό στη λογική της ιστορίας  2. Εργασία και τεχνολογία στη διάρθρωση της κοινωνίας  3. Αυτοματοποίηση, παγκοσμιοποίηση της παραγωγής και χειραφέτηση της εργασίας
title: «Εγκαταλελειμμένες Πόλεις»
Η περίπτωση της Αμμοχώστου
Creators: name: Χασιωτης Νικολαος
Publisher: name: Technical University of Crete
Year: 2013

description: Πόλη, ο χώρος όπου μεγάλες ομάδες ανθρώπων εκουσίως ή/και ακουσίως συγκεντρώθηκαν και εγκαταστάθηκαν με σκοπό την καλύτερη δυνατή διαβίωση τους. Ένας χώρος έντονης δραστηριότητας και δημιουργίας, στον οποίο με βάση τα  σκληρά υλικά δημιουργούνται κελύφη. Ένας ζωντανός οργανισμός εν εξελίξει συντιθέμενος από ανθρώπινες μονάδες και κελύφη σε συνεχή αλληλεπίδραση μεταξύ τους. Ένας ζωντανός οργανισμός που στην πορεία της ζωής, γεννιέται, αναπτύσσεται, μεταβάλλεται, εγκαταλείπεται και πολλές φορές πεθαίνει.

Τρανό παράδειγμα μιας τέτοιας κατάστασης είναι το Βαρώσι στην Αμμόχωστο που από το 1974 έχει εγκαταλειφθεί από τους κατοίκους του, κατά την τούρκικη εισβολή. Τέσσερις σχεδόν δεκαετίες πέρασαν, 39 χρόνια μετά και όλα παραμένουν ίδια, το Βαρώσι παρέμεινε εγκαταλελειμμένο μέχρι και σήμερα. Εγκαταλελειμμένα κελύφη έρμαια στο έλεος της φύσης και του χρόνου, χωρίς καμία ανθρώπινη επέμβαση.
Resource Reduction in Multiplexed High-Dimensional Quantum Reed-Solomon Codes
Creators: name: Nishio, Shin
name: Piparo, Nicolò Lo
name: Hanks, Michael
name: Munro, William John
name: Nemoto, Kae
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: H.1.1; E.4; K.6.3

description: Quantum communication technologies will play an important role in quantum information processing in the near future as we network devices together. However, their implementation is still a challenging task due to both loss and gate errors. Quantum error correction codes are one important technique to address this issue. In particular, the Quantum Reed-Solomon codes are known to be quite efficient for quantum communication tasks. The high degree of physical resources required, however, makes such a code difficult to use in practice. A recent technique called quantum multiplexing has been shown to reduce resources by using multiple degrees of freedom of a photon. In this work, we propose a method to decompose multi-controlled gates using fewer $\rm{CX}$ gates via this quantum multiplexing technique. We show that our method can significantly reduce the required number of $\rm{CX}$ gates needed in the encoding circuits for the quantum Reed-Solomon code. Our approach is also applicable to many other quantum error correction codes and quantum algorithms, including Grovers and quantum walks.
description: 9 pages, 11 figures
The reaction $πN \to ωN$ in a dynamical coupled-channel approach
Creators: name: Wang, Yu-Fei
name: Rönchen, Deborah
name: Meißner, Ulf-G.
name: Lu, Yu
name: Shen, Chao-Wei
name: Wu, Jia-Jun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: A refined investigation on light flavor meson-baryon scatterings is performed using a dynamical coupled-channel approach, the Jülich-Bonn model, that respects unitartiy and analyticity constraints. The channel space of $πN$, $πΔ$, $σN$, $ρN$, $ηN$, $K Λ$ and $K Σ$ is extended by adding the $ωN$ final state. The spectra of $N^*$ and $Δ$ resonances are extracted in terms of complex poles of the scattering amplitudes, based on the result of a global fit to a worldwide collection of data, in the energy region from the $πN$ threshold to center-of-mass energy $z=2.3$ GeV. A negative value of the $ωN$ elastic spin-averaged scattering length is extracted, questioning the existence of bound states of the $ω$ meson in the nuclear matter.
description: 23 pages, 16 figures, one supplemental material
Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMg$_2$Bi$_2$
Creators: name: Kondo, M.
name: Ochi, M.
name: Kurihara, R.
name: Miyake, A.
name: Yamasaki, Y.
name: Tokunaga, M.
name: Nakao, H.
name: Kuroki, K.
name: Kida, T.
name: Hagiwara, M.
name: Murakawa, H.
name: Hanasaki, N.
name: Sakai, H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnets, with topologically-nontrivial Dirac/Weyl points, have recently attracted significant attention owing to the unconventional physical properties, such as large anomalous Hall effects. However, they typically have a high carrier density and complicated band structure near the Fermi energy. In this study, we report degenerate magnetic semiconductor EuMg$_2$Bi$_2$, which exhibits a single valley at the $Γ$ point, where the field-tunable Weyl points form via the magnetic exchange interaction with the local Eu spins. By the high-field measurements on high-quality single crystals, we observed the quantum oscillations in resistivity, elastic constant, and surface impedance, which enabled us to determine the position of the Fermi energy. In combination with the first-principles calculation, we revealed that the Weyl points are located in the vicinity of the Fermi energy when the Eu spins are fully polarized. Furthermore, we observed large anomalous Hall effect (Hall angle $Θ_{\mathrm{AH}}\sim0.07$) in the forced ferromagnetic phase, which is consistent with this field variation of band structure.
description: 18 pages, 4 figures
Minimax risk of matrix denoising by singular value thresholding
Creators: name: Donoho, David
name: Gavish, Matan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: An unknown $m$ by $n$ matrix $X_0$ is to be estimated from noisy measurements $Y=X_0+Z$, where the noise matrix $Z$ has i.i.d. Gaussian entries. A popular matrix denoising scheme solves the nuclear norm penalization problem $\operatorname {min}_X\|Y-X\|_F^2/2+λ\|X\|_*$, where $\|X\|_*$ denotes the nuclear norm (sum of singular values). This is the analog, for matrices, of $\ell_1$ penalization in the vector case. It has been empirically observed that if $X_0$ has low rank, it may be recovered quite accurately from the noisy measurement $Y$. In a proportional growth framework where the rank $r_n$, number of rows $m_n$ and number of columns $n$ all tend to $\infty$ proportionally to each other ($r_n/m_n\rightarrow ρ$, $m_n/n\rightarrow β$), we evaluate the asymptotic minimax MSE $\mathcal {M}(ρ,β)=\lim_{m_n,n\rightarrow \infty}\inf_λ\sup_{\operatorname {rank}(X)\leq r_n}\operatorname {MSE}(X_0,\hat{X}_λ)$. Our formulas involve incomplete moments of the quarter- and semi-circle laws ($β=1$, square case) and the Marčenko-Pastur law ($β<1$, nonsquare case). For finite $m$ and $n$, we show that MSE increases as the nonzero singular values of $X_0$ grow larger. As a result, the finite-$n$ worst-case MSE, a quantity which can be evaluated numerically, is achieved when the signal $X_0$ is "infinitely strong." The nuclear norm penalization problem is solved by applying soft thresholding to the singular values of $Y$. We also derive the minimax threshold, namely the value $λ^*(ρ)$, which is the optimal place to threshold the singular values. All these results are obtained for general (nonsquare, nonsymmetric) real matrices. Comparable results are obtained for square symmetric nonnegative-definite matrices.
description: Published in at http://dx.doi.org/10.1214/14-AOS1257 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Variability from thermo-resistive instability in the atmospheres of hot jupiters
Creators: name: Hardy, Raphaël
name: Cumming, Andrew
name: Charbonneau, Paul
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The atmosphere of a hot jupiter may be subject to a thermo-resistive instability, in which the increasing electrical conductivity with temperature leads to runaway Ohmic heating. We introduce a simplified model of the local dynamics in the equatorial region of a hot jupiter that incorporates the back reaction on the atmospheric flow as the increasing electrical conductivity leads to flux freezing, which in turn quenches the flow and therefore the Ohmic heating. We demonstrate a new time-dependent solution that emerges for a temperature-dependent electrical conductivity (whereas a temperature-independent conductivity always evolves to a steady-state). The periodic cycle consists of bursts of Alfven oscillations separated by quiescent intervals, with the magnetic Reynolds number alternating between values smaller than and larger than unity, maintaining the oscillation. We investigate the regions of pressure and temperature in which the instability operates. For the typical equatorial accelerations seen in atmospheric models, we find instability at pressures $\sim 0.1$--$1\ {\rm bar}$ and temperatures $\approx 1300$--$1800\ {\rm K}$ for magnetic fields $\sim 10\ {\rm G}$. Unlike previous studies based on a constant wind velocity, we find that the instability is stronger for weaker magnetic fields. Our results add support to the idea that variability should be a feature of magnetized hot jupiter atmospheres, particularly at intermediate temperatures. The temperature-dependence of the electrical conductivity is an important ingredient that should be included in MHD models of hot jupiter atmospheric dynamics.
description: 10 pages, 5 figures, submitted to ApJ
Distribution of Artin-Schreier-Witt extensions
Creators: name: Lagemann, Thorsten
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The article at hand contains exact asymptotic formulas for the distribution of conductors of abelian p-extensions of global function fields of characteristic p. These yield a new conjecture for the distribution of discriminants fueled by an interesting lower bound.
description: arXiv admin note: text overlap with arXiv:1107.0906 [Remark of the author: Generalisation from elementary abelian p-groups to abelian p-groups]. appears in Journal of Number Theory (2015)
Time-Dependent Schrodinger Equation for Black Hole Evaporation: no Information Loss
Creators: name: Corda, Christian
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In 1976 S. Hawking claimed that "Because part of the information about the state of the system is lost down the hole, the final situation is represented by a density matrix rather than a pure quantum state" (Verbatim from ref. 2). This was the starting point of the popular "black hole (BH) information paradox". In a series of papers, together with collaborators, we naturally interpreted BH quasi-normal modes (QNMs) in terms of quantum levels discussing a model of excited BH somewhat similar to the historical semi-classical Bohr model of the structure of a hydrogen atom. Here we explicitly write down, for the same model, a time dependent Schrödinger equation for the system composed by Hawking radiation and BH QNMs. The physical state and the correspondent wave function are written in terms of an unitary evolution matrix instead of a density matrix. Thus, the final state results to be a pure quantum state instead of a mixed one. Hence, Hawking's claim is falsified because BHs result to be well defined quantum mechanical systems, having ordered, discrete quantum spectra, which respect 't Hooft's assumption that Schröedinger equations can be used universally for all dynamics in the universe. As a consequence, information comes out in BH evaporation in terms of pure states in an unitary time dependent evolution. In Section 4 of this paper we show that the present approach permits also to solve the entanglement problem connected with the information paradox.
description: 18 pages, definitive version accepted for publication in Annals of Physics. Comments are welcome. The results in arXiv:1210.7747 have been partially reviewed. Dedicated to the memory of the latter IFM Secretary Franco Pettini
Optimal Solutions for Joint Beamforming and Antenna Selection: From Branch and Bound to Graph Neural Imitation Learning
Creators: name: Shrestha, Sagar
name: Fu, Xiao
name: Hong, Mingyi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: This work revisits the joint beamforming (BF) and antenna selection (AS) problem, as well as its robust beamforming (RBF) version under imperfect channel state information (CSI). Such problems arise due to various reasons, e.g., the costly nature of the radio frequency (RF) chains and energy/resource-saving considerations. The joint (R)BF\&AS problem is a mixed integer and nonlinear program, and thus finding {\it optimal solutions} is often costly, if not outright impossible. The vast majority of the prior works tackled these problems using techniques such as continuous approximations, greedy methods, and supervised machine learning -- yet these approaches do not ensure optimality or even feasibility of the solutions. The main contribution of this work is threefold. First, an effective {\it branch and bound} (B\&B) framework for solving the problems of interest is proposed. Leveraging existing BF and RBF solvers, it is shown that the B\&B framework guarantees global optimality of the considered problems. Second, to expedite the potentially costly B\&B algorithm, a machine learning (ML)-based scheme is proposed to help skip intermediate states of the B\&B search tree. The learning model features a {\it graph neural network} (GNN)-based design that is resilient to a commonly encountered challenge in wireless communications, namely, the change of problem size (e.g., the number of users) across the training and test stages. Third, comprehensive performance characterizations are presented, showing that the GNN-based method retains the global optimality of B\&B with provably reduced complexity, under reasonable conditions. Numerical simulations also show that the ML-based acceleration can often achieve an order-of-magnitude speedup relative to B\&B.
First tests of the full SIDDHARTA-2 experimental apparatus with a 4 He gaseous target
Creators: name: Scordo, A.
name: Amsler, C.
name: Bazzi, M.
name: Bosnar, D.
name: Bragadireanu, M.
name: Cargnelli, M.
name: Carminati, M.
name: Clozza, A.
name: Deda, G.
name: De Paolis, L.
name: Del Grande, R.
name: Fabbietti, L.
name: Fiorini, C.
name: Guaraldo, C.
name: Iliescu, M.
name: Iwasaki, M.
name: Khreptak, A.
name: King, P.
name: Sandri, P. Levi
name: Manti, S.
name: Marton, J.
name: Miliucci, M.
name: Moskal, P.
name: Napolitano, F.
name: Niedźwiecki, S.
name: Ohnishi, H.
name: Piscicchia, K.
name: Sada, Y.
name: Sgaramella, F.
name: Shi, H.
name: Silarski, M.
name: Sirghi, D. L.
name: Sirghi, F.
name: Skurzok, M.
name: Spallone, A.
name: Toho, K.
name: Tüchler, M.
name: Doce, O. Vazquez
name: Yoshida, C.
name: Zmeskal, J.
name: Curceanu, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In this paper, we present the first tests performed after the full installation of the SIDDHARTA-2 experimental apparatus on the Interaction Region of the DAΦNE collider at the INFN National Laboratories of Frascati. Before starting the first measurement of the kaonic deuterium 2p{\rightarrow}1s transition, accurate evaluation of the background rejection. mainly achieved with the Kaon Trigger system, was required. This run, performed in the period 04-26/05/2022 with a 4 He gaseous target, confirmed the 10^5 rejection factor obtained with a reduced version of the setup and different machine conditions in 2021. This important outcome motivated the filling of the target cell with deuterium and the starting of the measurement campaign of the kaonic deuterium 2p{\rightarrow}1s transition.
A quantum cloning bound and application to quantum key distribution
Creators: name: Woodhead, Erik
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a quantum cloning bound which we apply to a straightforward and relatively direct security proof of the prepare-and-measure Bennett-Brassard 1984 (BB84) quantum key distribution (QKD) protocol against collective attacks. The approach we propose is able to handle the practical problem of source and detector alignment imprecisions in a simple way. Specifically, we derive a keyrate bound for a BB84 implementation in which Alice's source emits four given but arbitrary pure states, where the usual equivalence between prepare-and-measure and entanglement-based QKD no longer applies. Our result is similar to a keyrate derived by Marøy et. al. [Phys. Rev. A 82, 032337 (2010)] and generally an improvement over the keyrate derivable from the entropic uncertainty relation in situations where it applies. We also provide a stronger result for a source emitting arbitrary qubit states, and a further improved result if the detector is additionally assumed two dimensional.
title: Emission and Mechanical Properties of Glass and Cellulose Fiber Reinforced Bio-Polyamide Composites
Creators: name: Wolff, Susanne
name: Rüppel, Annette
name: Rida, Hassan Ali
name: Heim, Hans-Peter
Publisher: name: Universität Kassel
Year: 2023
Subjects: subject: fiber reinforced composites
subject: bio-polyamide
subject: glass fiber
subject: cellulosic fiber
subject: VOC analysis
subject: emission
subject: sensory evaluation
subject: odor
subject: mechanical properties
subject: 540
subject: 600
subject: Mechanische Eigenschaft
subject: Cellulosefaser
subject: Glasfaser
subject: Polyamide
subject: Emission

description: Gefördert durch den Publikationsfonds der Universität Kassel
title: Μουσείο αλιείας και αλιευτικών σκαφών στο αλιευτικό καταφύγιο Ραφήνας
Creators: name: Τριβυζα Ειρηνη
Publisher: name: Technical University of Crete
Year: 2013

description: Από την αρχαιότητα στη Ραφήνα λειτουργούσε μια από τις μεγαλύτερες ιχθυόσκαλες στην Ελλάδα εξαιτίας του εξαιρετικού θαλάσσιου πλούτου του Ευβοϊκού Κόλπου και των προσήνεμων φυσικών κολπίσκων που επέτρεπαν την παράκτια αλιεία . Μάλιστα,   προβιομηχανικά υπήρξε η δεύτερη μεγαλύτερη ιχθυόσκαλα στην Ελλάδα μετά τη Νέα Μηχανιώνα.  Όμως, η δημιουργία του εμπορικού λιμανιού στην περιοχή και η εισαγωγή νέων πιο εξελιγμένων τεχνολογικά μεθόδων αλίευσης οδήγησε σταδιακά στην παρακμή αυτής της χρήσης του λιμένα. Στις μέρες μας λειτουργεί αλιευτικό καταφύγιο στο λιμένα Ραφήνας το οποίο είναι βεβαρημένο με επιπλέον χρήσεις (ναυταθλητικός όμιλος και ελλιμενισμός σκαφών αναψυχής).
Στα πλαίσια Ευρωπαϊκού κονδυλιού για  την ανάπτυξη του αλιευτικού τουρισμού σε περιοχές  που φιλοξενούν διαχρονικά αυτή τη ν ασχολία, η διπλωματική αυτή προτείνει την ανάδειξη της εν λόγω δραστηριότητας του λιμανιού της Ραφήνας. Η πρόταση επιδιώκει :
•	Τη δημιουργία  μουσείου εκπαιδευτικού χαρακτήρα το οποίο με διαδραστικό τρόπο  θα παρουσιάζει την εξέλιξη της αλιείας από την αρχαιότητα μέχρι σήμερα.
•	 Την  αποκλειστική χρήση του λιμανιού του καταφύγιου από τους αλιείς
•	Την  ενίσχυση της οικονομικής ζωής της συγκεκριμένης περιοχής  με την αναβίωση του αλιευτικού χαρακτήρα της Ραφήνας
•	Την αναβάθμιση του  παραλιακού μετώπου του λιμανιού μέσω της συγκεκριμένης  αρχιτεκτονικής παρέμβασης
Polarization of the final nucleon in quasi-elastic neutrino scattering and the axial form factor of the nucleon
Creators: name: Bilenky, Samoil M.
name: Christova, Ekaterina
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Measurements of the polarization of the final proton in elastic e-p scattering drastically changed our knowledge about the electromagnetic form factors of the proton. Here we present our results of the calculation of the polarization of the final nucleon in charged current quasi-elastic neutrino nucleon scattering. Relations which connect the axial form factor with the polarization, the cross section and the electromagnetic form factors of the nucleon are derived. Measurements of the polarization of the nucleon in the high-statistics short baseline neutrino experiments (or in near detectors of long baseline experiments) could provide important information on the axial form factor of the nucleon.
description: Section with numerical results is added which is not in the journal version; 18 pages, 4 figures, Latex file
title: Time lapse seismic monitoring of CO2 injection for EOR projects
Creators: name: Βλασσοπουλου Αγγελικη
Publisher: name: Technical University of Crete
Year: 2015

description: Simulation of a CO2 injection project was conducted for the Prinos oil reservoirs. The change in seismic response of the reservoir layers, with the fluid substitution in the pore space of the formations, is tried to be detected by time-lapse seismic monitoring method. Synthetic seismic data are produced for the purpose of the study by a finite- difference algorithm of wave propagation. The seismic data before and after the injection of CO2 are being processed with seismic processing algorithms in Matlab. The difference of the derived seismic sections is the result of the time-lapse study, the interpretation of which reveals the variations in the properties of the reservoir.
Semi-Markov processes in open quantum systems: Connections and applications in counting statistics
Creators: name: Liu, Fei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using the age-structure formalism, we definitely establish connections between semi-Markov processes and the dynamics of open quantum systems that satisfy the Markov quantum master equations. A generalized Feynman-Kac formula of the semi-Markov processes is also proposed. In addition to inheriting all statistical properties possessed by the piecewise deterministic processes of wavefunctions, the semi-Markov processes show their unique advantages in quantum counting statistics. Compared with the conventional method of the tilted quantum master equation, they can be applied to more general counting quantities. In particular, the terms involved in the method have precise probability meanings. We use a driven two-level quantum system to exemplify these results.
description: 3 figures
Reconstruction of smooth shape defects in waveguides using locally resonant frequencies
Creators: name: Niclas, Angèle
name: Seppecher, Laurent
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This article aims to present a new method to reconstruct slowly varying width defects in 2D waveguides using locally resonant frequencies. At these frequencies, locally resonant modes propagate in the waveguide under the form of Airy functions depending on a parameter called the locally resonant point. In this particular point, the local width of the waveguide is known and its location can be recovered from boundary measurements of the wavefield. Using the same process for different frequencies, we produce a good approximation of the width in all the waveguide. Given multi-frequency measurements taken at the surface of the waveguide, we provide a L \infty-stable explicit method to reconstruct the width of the waveguide. We finally validate our method on numerical data, and we discuss its applications and limits.
Niesen und Stockhorn. Berg-Besteigungen im 16. Jht. Zwei Latein-Texte von Berner Humanisten. (loannes Rhellicanus [d.i. Johannes Müller aus Rhellikon]: Stockhornias. Benedictus Aretius [d.i. Benedikt Marti]: Stockhornii et Nessi montium ... brevis descriptio]. Hrsg., übers. u. komm. v. Max A. Bratschi
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Niesen und Stockhorn. Berg-Besteigungen im 16. Jht. Zwei Latein-Texte von Berner Humanisten. (loannes Rhellicanus [d.i. Johannes Müller aus Rhellikon]: Stockhornias. Benedictus Aretius [d.i. Benedikt Marti]: Stockhornii et Nessi montium ... brevis descriptio]. Hrsg., übers. u. komm. v. Max A. Bratschi. Thun: Ott Verlag (o.J.) 94 S. 16 SFr (ISBN 3-7225-6883-8).
description: Forum Classicum, Nr. 1 (1999): Forum Classicum
Accretion of the relativistic Vlasov gas in the equatorial plane of the Kerr black hole
Creators: name: Cieślik, Adam
name: Mach, Patryk
name: Odrzywolek, Andrzej
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate stationary accretion of the collisionless Vlasov gas onto the Kerr black hole, occurring in the equatorial plane. The solution is specified by imposing asymptotic boundary conditions: at infinity the gas obeys the Maxwell-Jüttner distribution, restricted to the equatorial plane (both in positions and momenta). In the vicinity of the black hole, the motion of the gas is governed by the spacetime geometry. We compute accretion rates of the rest-mass, the energy, and the angular momentum, as well as the particle number surface density, focusing on the dependence of these quantities on the asymptotic temperature of the gas and the black hole spin. The rest-mass and energy accretion rates, normalized by the black hole mass and appropriate asymptotic surface densities of the gas, increase with increasing asymptotic temperature. The accretion slows down the rotation of the black hole.
description: 24 pages, 17 figures
Development and greenness assessment of a stability-indicating HPLC-DAD method for simultaneous determination of allopurinol and benzbromarone
Creators: name: El-Kafrawy, Dina S.
name: Abdelhamid, Ahmed G.
name: Abdel-Khalek, Magdi M.
name: Belal, Tarek S.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Space Science
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences

description: The growing interest in Green Analytical Chemistry (GAC) principles through the replacement of polluting analytical procedures with greener ones, has encouraged us to develop an eco-friendly stability-indicating HPLC with diode array detection method (HPLC-DAD) for simultaneous determination of allopurinol (ALP) and benzbromarone (BNZ). Effective separation was accomplished using Durashell C18 column (4.6 × 250 mm, 5 µm particle size) with gradient elution of the mobile phase composed of 0.02 M ammonium acetate (pH 5.0) and methanol. Quantification of ALP and BNZ was based on measuring their peak areas at 251 nm. ALP and BNZ peaks eluted at retention times 4.85 and 10.30 min respectively. The proposed HPLC procedure was carefully validated in terms of system suitability, linearity, ranges, precision, accuracy, specificity, robustness, detection, and quantification limits. The linearity range for both ALP and BNZ was 5–100 µg/mL with correlation coefficients >0.9999. Forced degradation conditions of neutral, acidic, and alkaline hydrolysis, oxidation, and thermal degradation were applied on both drugs. Good resolution of the drugs from their forced degradation products proved that the proposed method is stability-indicating. In addition, the resolution of both drugs from about 10 pharmacologically or chemically related pharmaceutical compounds of different medicinal categories showed the high specificity of the proposed method. The validated HPLC method was successfully applied to the simultaneous determination of both drugs in their tablet dosage forms. Furthermore, greenness assessment and comparison with previously published methods were carried out using two different GAC metrics, namely, the national environmental method index (NEMI) and the analytical Eco-Scale.
Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b
Creators: name: Kasper, David
name: Bean, Jacob L.
name: Line, Michael R.
name: Seifahrt, Andreas
name: Brady, Madison T.
name: Lothringer, Joshua
name: Pino, Lorenzo
name: Fu, Guangwei
name: Pelletier, Stefan
name: Stürmer, Julian
name: Benneke, Björn
name: Brogi, Matteo
name: Désert, Jean-Michel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present high-resolution dayside thermal emission observations of the exoplanet KELT-20b/MASCARA-2b using the MAROON-X spectrograph. Applying the cross-correlation method with both empirical and theoretical masks and a retrieval analysis, we confirm previous detections of Fe\,\textsc{i} emission lines and we detect Ni\,\textsc{i} for the first time in the planet (at 4.7$σ$ confidence). We do not see evidence for additional species in the MAROON-X data, including notably predicted thermal inversion agents TiO and VO, their atomic constituents Ti\,\textsc{i} and V\,\textsc{i}, and previously claimed species Fe\,\textsc{ii} and Cr\,\textsc{i}. We also perform a joint retrieval with existing \textit{Hubble Space Telescope}/WFC3 spectroscopy and \textit{Spitzer}/IRAC photometry. This allows us to place bounded constraints on the abundances of Fe\,\textsc{i}, H$_2$O, and CO, and to place a stringent upper limit on the TiO abundance. The results are consistent with KELT-20b having a solar to slightly super-solar composition atmosphere in terms of the bulk metal enrichment, and the carbon-to-oxygen and iron-to-oxygen ratios. However, the TiO volume mixing ratio upper limit (10$^{-7.6}$ at 99\% confidence) is inconsistent with this picture, which, along with the non-detection of Ti\,\textsc{i}, points to sequestration of Ti species, possibly due to nightside condensation. The lack of TiO but the presence of a large H$_2$O emission feature in the WFC3 data is challenging to reconcile within the context of 1D self-consistent, radiative-convective models.
description: 14 pages, 9 figures, 2 tables
Deep learning based black spot identification on Greek road networks
Creators: name: Karamanlis, Ioannis
name: Kokkalis, Alexandros
name: Profillidis, Vassilios
name: Botzoris, George
name: Kiourt, Chairi
name: Sevetlidis, Vasileios
name: Pavlidis, George
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Black spot identification, a spatiotemporal phenomenon, involves analyzing the geographical location and time-based occurrence of road accidents. Typically, this analysis examines specific locations on road networks during set time periods to pinpoint areas with a higher concentration of accidents, known as black spots. By evaluating these problem areas, researchers can uncover the underlying causes and reasons for increased collision rates, such as road design, traffic volume, driver behavior, weather, and infrastructure. However, challenges in identifying black spots include limited data availability, data quality, and assessing contributing factors. Additionally, evolving road design, infrastructure, and vehicle safety technology can affect black spot analysis and determination. This study focused on traffic accidents in Greek road networks to recognize black spots, utilizing data from police and government-issued car crash reports. The study produced a publicly available dataset called Black Spots of North Greece (BSNG) and a highly accurate identification method.
Security of decoy-state quantum key distribution with correlated intensity fluctuations
Creators: name: Sixto, Xoel
name: Zapatero, Víctor
name: Curty, Marcos
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: One of the most prominent techniques to enhance the performance of practical quantum key distribution (QKD) systems with laser sources is the decoy-state method. Current decoy-state QKD setups operate at GHz repetition rates, a regime where memory effects in the modulators and electronics that control them create correlations between the intensities of the emitted pulses. This translates into information leakage about the selected intensities, which cripples a crucial premise of the decoy-state method, thus invalidating the use of standard security analyses. To overcome this problem, a novel security proof that exploits the Cauchy-Schwarz constraint has been introduced recently. Its main drawback is, however, that the achievable key rate is significantly lower than that of the ideal scenario without intensity correlations. Here, we improve this security proof technique by combining it with a fine-grained decoy-state analysis, which can deliver a tight estimation of the relevant parameters that determine the secret key rate. This results in a notable performance enhancement, being now the attainable distance double than that of previous analyses for certain parameter regimes. Also, we show that when the probability density function of the intensity fluctuations, conditioned on the current and previous intensity choices, is known, our approach provides a key rate very similar to the ideal scenario, which highlights the importance of an accurate experimental characterization of the correlations.
description: 19 pages, 6 figures
Antike(n) auf die Schippe genommen. Bilder und Motive aus der Alten Welt in der Karikatur (Ausstellungskatalog), herausgegeben im Auftrag der Winckelmann-Gesellschaft von Max Kunze
Creators: name: Rabl, Josef
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Antike(n) auf die Schippe genommen. Bilder und Motive aus der Alten Welt in der Karikatur (Ausstellungskatalog), herausgegeben im Auftrag der Winckelmann-Gesellschaft von Max Kunze, VIII, 138 Seiten mit 42 Farb- und 99 Schwarzweißabbildungen, Verlag Philipp von Zabern, Mainz am Rhein 1998, DM 38.00 (ISBN 3-8053-2527-4).
description: Forum Classicum, Nr. 1 (1999): Forum Classicum
Soft Scalars don't decouple
Creators: name: Biswas, Shovon
name: Semenoff, Gordon W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is demonstrated that it is possible to find a field theory containing massless scalar particles which has infrared structure closely resembling that of quantum electrodynamics and perturbative quantum gravity but exhibiting no gauge invariance or internal symmetries at all, and in particular, no apparent asymptotic symmetry. It is shown that, unlike soft photons and gravitons, the soft scalars do not decouple from dressed states and they are generically produced when hard dressed particles interact. However, the entanglement of the hard and resulting soft particles is vanishingly small.
description: Version to published in :hys. Rev. D
title: Ανάλυση ακουστικών εκπομπών κατά τη δοκιμή βραζιλιανού δίσκου σε δοκίμια μαρμάρου
Creators: name: Θεοφανοπουλου Αννα
Publisher: name: Technical University of Crete
Year: 2015

description: Για τις ανάγκες της διπλωματικής διαμορφώθηκαν δοκίμια και έγιναν πειράματα έμμεσου εφελκυσμού με σύγχρονη καταγραφή ακουστικών εκπομπών σε οκτώ κανάλια στο εργαστήριο της Μηχανικής Πετρωμάτων της σχολής Μηχανικών Ορυκτών Πόρων του Πολυτεχνείου Κρήτης σε συνεργασία με το εργαστήριο Γεωφυσικής και Σεισμολογίας του τμήματος Φυσικών Πόρων και Περιβάλλοντος του Τεχνολογικού Εκπαιδευτικού Ιδρύματος Κρήτης.
Παρουσιάζονται αποτελέσματα συσχέτισης των καταγεγραμμένων ακουστικών εκπομπών με το φορτίο που δέχονται τα δοκίμια κατά τη Βραζιλιανή δοκιμή και αναλύεται και διερευνάται διεξοδικά η επίδραση της μικρορωγμάτωσης του υλικού πριν από την αστοχία σε σχέση με τις αυτές.
An effective gauge-Higgs operators analysis of new physics associated with the Higgs
Creators: name: Chang, We-Fu
name: Pan, Wei-Ping
name: Xu, Fanrong
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the new physics(NP) related to the recent discovered 125 GeV Higgs by employing an important subset of the standard model(SM) gauge invariant dimension-six operators constructed by the the SM Higgs and gauge fields. Explicitly, we perform a model-independent study on the production and decays of the Higgs, the electric dipole moments(EDM) of the neutron and the electron, and we take into account the anomalous magnetic dipole moments of muon and electron as well. We find that, even all Higgs decay channels agree with the SM predictions, the SM theoretical uncertainties provide a lot of room to host NP associated with the 125 GeV boson. A linear relation is revealed in our numerical study that $μ_{ZZ}\simeq μ_{WW}$ and $ 0.6 \lesssim μ_{ZZ,WW} \lesssim 1.4$ at 95% CL with or without the EDM's constraints. The neutron and electron EDM's severely constrain the relevant Wilson coefficients. Therefore the CP violating components in the $h\rightarrow WW, ZZ$ channels are too small, $\sim{\cal O}(10^{-5})$, to be detected at LHC. However, we point out that even the parity of the 125GeV boson has been largely determined to be even in the $h\to ZZ$ channel, one should pay special attention to the potentially large CP violation in the $h\to γγ$ and $h\to γZ$ channels. This should be seriously checked in the future spin correlation experiments.
description: 32 pages, 11 figures; UV complete model section revised, typos corrected, and refernces added
Polaczek, Dietmar: Geliebtes Chaos Italien
Creators: name: Hotz, Michael
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Polaczek, Dietmar: Geliebtes Chaos Italien. Berlin: Koehler & Amelang 1998. 334 S., 39,80 DM (ISBN 3-7338-0220-9).
description: Forum Classicum, Nr. 1 (1999): Forum Classicum
title: Allocation of oil families in Williston Basin (North America) oil using chemometric algorithms

Creators: name: Χουστουλακης Κυριακος
Publisher: name: Technical University of Crete
Year: 2015

description: Significant geochemical information is carried by the gasoline range, the saturate fraction and the biomarkers compositional data of oils. In this thesis the ability of chemometric methods is investigated in revealing of the oil families and the associated petroleum systems in Williston Basin. Multivariate statistical method of Principal Component Analysis (PCA) was applied to the gasoline range data, the saturate fraction data and to the biomarkers data for oil samples from the Williston Basin.
Master thesis is organized in six chapters. Chapter 1 is an introduction that describes the scope of the thesis. Chapter 2 focuses on the introduction of the geological setting of the studied oils. Chapter 3 covers the principles of the Principal Component Analysis. In chapter 4 an extensive description of the MATLAB code used in this study is presented. Chapter 5 covers the examination of three implemented models that are: the Saturated Gasoline Model, the Biomarkers Model and the combined Biomarkers Gasoline and Saturated range Model. The aim of these models is to separate the oils into families and examine the performance of each model in family affiliation. In Williston Basin six oil families have been well recognized namely A, B, C, D, E and F. Finally in chapter 6 the conclusions of the three models are presented. In model 1 the separation of families A and C is clear, while samples from B and D oil families are overlapping. Model 2 shows a clear separation of oil families E and F while oil samples from family C arising as two different subgroups. Model 3 enhances the separation of C family oils into two distinct subgroups.
Equilateral sets and a Schütte Theorem for the 4-norm
Creators: name: Swanepoel, Konrad J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Metric Geometry (math.MG)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 46B20, Secondary 52A21, 52C17

description: A well-known theorem of Schütte (1963) gives a sharp lower bound for the ratio between the maximum distance and minimum distance between n+2 points in n-dimensional Euclidean space. In this brief note we adapt Bárány's elegant proof of this theorem to the space $\ell_4^n$. This gives a new proof that the largest cardinality of an equilateral set in $\ell_4^n$ is n+1, and gives a constructive bound for an interval $(4-ε_n,4+ε_n)$ of values of p close to 4 for which it is guaranteed that the largest cardinality of an equilateral set in $\ell_p^n$ is n+1.
description: 7 pages. Some technical details added