cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Μελέτη ρευστομηχανικών χαρακτηριστικών αέρα σε αεροσήραγγα, παρουσία κατασκευής – εμποδίου με χρήση υπολογιστικής ρευστομηχανικής
Creators: name: Παρθενιώτης, Γεώργιος Αστερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αεροσήραγγα
Ρευστομηχανική
Προφίλ ταχυτήτων
Wind tunnel
Fluid mechanics
Velocity profiles

description: Σκοπός της παρούσας διατριβής ήταν η μοντελοποίηση της ροής του αέρα πάνω από ένα εμπόδιο σε περιβάλλον αεροσήραγγας με χρήση εμπορικού πακέτου ρευστομηχανικής. Το σχήμα του εμποδίου προσομοιάζει με θερμοκήπιο και το μέγεθός του είναι αρκετά μικρότερο σε σχέση με το ύψος της αεροσήραγγας, έτσι ώστε να εξασφαλιστεί ότι δεν θα υπάρχουν φαινόμενα αλληλεπίδρασης της ροής πάνω από το εμπόδιο και της οροφής της αεροσήραγγας. Στην συγκεκριμένη εργασία, διερευνήθηκε η ύπαρξη στροβιλισμών στην περιοχή του εμποδίου, και επετεύχθη η εξαγωγή προφίλ ταχυτήτων και πιέσεων κατά μήκος της ροής. Η σύγκριση των προφίλ της οριζόντιας και κατακόρυφης συνιστώσας της ταχύτητας, έκανε δυνατή την ανακάλυψη της ύπαρξης στροβιλισμών πριν και μετά το εμπόδιο. Μέσω της τεχνικής αυτής, εξήχθησαν συμπεράσματα για το μέγεθος των στροβιλισμών για τρεις διαφορετικές ταχύτητες ροής καθώς και την απόσταση κατά την οποία η επίδραση του εμποδίου προκαλεί διαταραχές στην ροή. Τέλος, πραγματοποιήθηκε, μια συγκριτική μελέτη των αποτελεσμάτων σε ότι αφορά τις μέγιστες και ελάχιστες τιμές των ταχυτήτων και των πιέσεων για τα τρία k – ε τυρβώδη μοντέλα τα οποία χρησιμοποιήθηκαν. Η μελέτη αυτή έδειξε ότι οι διαφοροποιήσεις στα παραπάνω ποσότητες δεν είναι σημαντικές, και οι διαφοροποιήσεις αυτές ελαχιστοποιούνταν καθώς η ταχήτητα ροής του αέρα αυξανόταν
description: The aim of the present thesis was to model the air flow over an obstacle, in a wind tunnel using commercial fluid dynamics software package. The shape of the obstacle resembles a greenhouse construction, and the its size, is small enough compared to the height of the wind tunnel, so to ensure that there will be no issues concerning interference in flow between the roof of the obstacle and the celling of the wind tunnel. In this specific research the presence of eddies in the obstacle ‘s area, was investigated, and profiles for the velocity and pressure for various positions along the wind tunnel. The comparison between the horizontal and vertical component of the velocity proved the development and existence of eddies before and after the obstacle. With this technique, useful conclusions were exported as far as the size of the eddies is concerned for three different flow velocities, as well as, the distance the flow was disturbed due to the obstacle ‘s presence. Finally, a comparative study of the results in the maximum and minimum values of the velocities and pressures for all three k – ε turbulent models was curried out. The outcome was that the differences on the aforementioned quantities were small and were getting smaller as the air flow velocity was increased
$^{87}$Sr lattice clock with inaccuracy below 10$^{-15}$
Creators: name: Boyd, Martin M.
name: Ludlow, Andrew D.
name: Blatt, Sebastian
name: Foreman, Seth M.
name: Ido, Tetsuya
name: Zelevinsky, Tanya
name: Ye, Jun
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Aided by ultra-high resolution spectroscopy, the overall systematic uncertainty of the $^{1}S_{0}$-$^{3}P_{0}$ clock resonance for lattice-confined $^{87}$Sr has been characterized to $9\times10^{-16}$. This uncertainty is at a level similar to the Cs-fountain primary standard, while the potential stability for the lattice clocks exceeds that of Cs. The absolute frequency of the clock transition has been measured to be 429,228,004,229,874.0(1.1) Hz, where the $2.5\times10^{-15}$ fractional uncertainty represents the most accurate measurement of a neutral-atom-based optical transition frequency to date.
description: 4 pages, 4 figures, 2 tables
Two-level systems driven by large-amplitude fields
Creators: name: Ashhab, S.
name: Johansson, J. R.
name: Zagoskin, A. M.
name: Nori, Franco
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We analyze the dynamics of a two-level system subject to driving by large-amplitude external fields, focusing on the resonance properties in the case of driving around the region of avoided level crossing. In particular, we consider three main questions that characterize resonance dynamics: (1) the resonance condition, (2) the frequency of the resulting oscillations on resonance and (3) the width of the resonance. We identify the regions of validity of different approximations. In a large region of the parameter space, we use a geometric picture in order to obtain both a simple understanding of the dynamics and quantitative results. The geometric approach is obtained by dividing the evolution into discrete time steps, with each time step described by either a phase shift on the basis states or a coherent mixing process corresponding to a Landau-Zener crossing. We compare the results of the geometric picture with those of a rotating-wave approximation. We also comment briefly on the prospects of employing strong driving as a useful tool to manipulate two-level systems.
description: 10 pages (two-column), 6 figures
Quadratic Convergence of Smoothing Newton's Method for 0/1 Loss Optimization
Creators: name: Zhou, Shenglong
name: Pan, Lili
name: Xiu, Naihua
name: Qi, Houduo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: It has been widely recognized that the 0/1 loss function is one of the most natural choices for modelling classification errors, and it has a wide range of applications including support vector machines and 1-bit compressed sensing. Due to the combinatorial nature of the 0/1 loss function, methods based on convex relaxations or smoothing approximations have dominated the existing research and are often able to provide approximate solutions of good quality. However, those methods are not optimizing the 0/1 loss function directly and hence no optimality has been established for the original problem. This paper aims to study the optimality conditions of the 0/1 function minimization, and for the first time to develop Newton's method that directly optimizes the 0/1 function with a local quadratic convergence under reasonable conditions. Extensive numerical experiments demonstrate its superior performance as one would expect from Newton-type methods.ions. Extensive numerical experiments demonstrate its superior performance as one would expect from Newton-type methods.
Flux predictions of high-energy neutrinos from pulsars
Creators: name: Link, Bennett
name: Burgio, Fiorella
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Young, rapidly rotating neutron stars could accelerate ions from their surface to energies of $\sim 1$ PeV. If protons reach such energies, they will produce pions (with low probability) through resonant scattering with x-rays from the stellar surface. The pions subsequently decay to produce muon neutrinos. Here we calculate the energy spectrum of muon neutrinos, and estimate the event rates at Earth. The spectrum consists of a sharp rise at $\sim 50$ TeV, corresponding to the onset of the resonance, above which the flux drops with neutrino energy as $ε_ν^{-2}$ up to an upper-energy cut-off that is determined by either kinematics or by the maximum energy to which protons are accelerated. We estimate event rates as high as 10-100 km^${-2}$ yr$^{-1}$ from some candidates, a flux that would be easily detected by IceCube. Lack of detection would allow constraints on the energetics of the poorly-understood pulsar magnetosphere.
description: MNRAS, 6 pages, 3 figures, 1 table. Minor editorial changes and typos corrected
Chebyshev spectral methods for potential field computation
Creators: name: Zhao, Shengkai
Publisher: name: University of British Columbia
Year: 2008

description: We investigate Chebyshev spectral methods for solving Poisson's equation and the generalized Poisson's equations and apply them to 3-D gravity and DC resistivity modeling. When we approximate a function by a finite sum of Chebyshev polynomials, there are two kinds of errors: truncation and aliasing. We present a cell-average discretization scheme to reduce the aliasing error. Both theoretical analysis and numerical examples show that when there are discontinuities in a function, the cell-average discretization is better than the point injection discretization. We use both the r and collocation methods to solve Poisson's equation V2u = f. We solve the discrete systems by a matrix-diagonalization method. The speed and accuracy of collocation methods are better than those of the r method. For the generalized Poisson's equation V • (oVu) = f, we present a new iterative method. We rewrite the equation in the form of a Poisson's equation, V2u = (f —Va•Vu)la. At each iteration we compute the right hand-side term from the current value of u first. Then we solve the resultant Poisson’s equation by the collocation method. Numerical results show that the convergence rate of the new method is much faster than that of the spectral multi grid method. When there are discontinuities in the source function f and/or the conductivity o, the single-domain Chebyshev spectral method does not converge exponentially. In this case we use the multi-domain Chebyshev spectral method to solve the problem. We divide the whole domain into a number of subdomains so that in each subdomain the function is infinitely differentiable. Then we approximate the function by a separate Chebyshev series in each subdomain. We determine the relations between the Chebyshev polynomials in adjacent subdomains by the interface conditions. In this way we can achieve exponential convergence. In 3-D gravity modeling, we present a method to realize 2-D and 3-D point-injection and cell-average discretizations, use a multi pole expansion to compute the approximate boundary conditions and solve the equations by both single-domain and multi-domain Chebyshev spectral methods. We also extend Okabe's analytic formulation for the gravitational field of a homogeneous, polyhedral body to the potential. Numerical results show that the accuracy of the cell-average discretization is better than that of the point injection discretization. The multi-domain solution is the best. We apply the multi-domain Chebyshev spectral method to 3-D DC resistivity modeling. We discuss the singularity removal and present a modified finite-difference method for comparison. For a two-layered model, the multi-domain Chebyshev spectral solution is far more accurate than the finite-difference solution. For piecewise-constant and piecewise-smooth models the solutions obtained by both methods agree with each other quite well. However, the Chebyshev spectral method is more efficient than the finite-difference method.
BC-SIM-TR-007 STC Delta-NECP REPORT Issue 1.0
Creators: name: SIMIONI, EMANUELE
name: SLEMER, ALESSANDRA
name: Da Deppo, Vania
name: ZUSI, MICHELE
name: POLITI, ROMOLO
name: RE, Cristina
name: Carlier, Vincent
name: CAPACCIONI, FABRIZIO
name: CAPRIA, MARIA TERESA
name: Doressundiram, Alain
name: Langeven, Yves
name: PALUMBO, PASQUALE
name: Vincendon, Mathieu
name: CREMONESE, Gabriele
Publisher: name: O.A. Padova
Year: 2020

description: Ai miei genitori.
description: The present document has been issued to describe the Delta – Near Earth Commissioning Phase (dNECP) Tests of STC Stereo Camera ,Channel Of SIMBIO-SYS (Spectrometers and Imagers for MPO BepiColombo Integrated Observatory SYStem).
Phase transition of an open quantum walk
Creators: name: Machida, Takuya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It has been discovered that open quantum walks diffusively distribute in space, since they were introduced in 2012. Indeed, some limit distributions have been demonstrated and most of them are described by Gaussian distributions. We operate an open quantum walk on $\mathbb{Z}=\left\{0, \pm 1, \pm 2,\ldots\right\}$ with parameterized operations in this paper, and study its 1st and 2nd moments so that we find its standard deviation. The standard deviation tells us whether the open quantum walker shows diffusive or ballistic behavior, which results in a phase transition of the walker.
description: 22 pages, 20 figures
Dark Matter Candidates: What Cold, ..and What's Not
Creators: name: Krauss, Lawrence M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this brief review of recent theoretical developments associated with the search for dark matter I describe the following: why baryons are now ruled out as dark matter candidates; SUSY WIMPS and signatures in the MSSM and NMSSM why claimed indirect signatures are probably not WIMP related, why axions may be of new interest, how WIMP detection might tell us about the galactic halo, and how theorists are preparing to avoid the next generation of experimental constraints.
description: 6 pages, Invited Review talk, Neutrino 2006. To appear in Proceedings
BC-SIM-TN-003 Reports and Note Layout and Flow
Creators: name: POLITI, ROMOLO
name: ZUSI, MICHELE
name: SIMIONI, EMANUELE
name: CAPACCIONI, FABRIZIO
name: CAPRIA, MARIA TERESA
name: DORESSOUNDIRAM, ALAIN
name: LANGEVIN, YVES
name: PALUMBO, PASQUALE
name: VINCENDON, MATHIEU
name: CREMONESE, Gabriele
Publisher: name: IAPS Roma
Year: 2020

description: In this document, we will describe the name convention, the format, the flow of reports, notes, and plans produced for the Spectrometers and Imagers for MPO BepiColombo Integrated Observatory SYStem (SIMBIO-SYS).
Black Holes in Ultraviolet-Complete Horava Gravity
Creators: name: Lara, Guillermo
name: Herrero-Valea, Mario
name: Barausse, Enrico
name: Sibiryakov, Sergey M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Horava gravity is a proposal for completing general relativity in the ultraviolet by interactions that violate Lorentz invariance at very high energies. We focus on (2+1)-dimensional projectable Horava gravity, a theory which is renormalizable and perturbatively ultraviolet-complete, enjoying an asymptotically free ultraviolet fixed point. Adding a small cosmological constant to regulate the long distance behavior of the metric, we search for all circularly symmetric stationary vacuum solutions with vanishing angular momentum and approaching the de Sitter metric with a possible angle deficit at infinity. We find a two-parameter family of such geometries. Apart from the cosmological de Sitter horizon, these solutions generally contain another Killing horizon and should therefore be interpreted as black holes from the viewpoint of the low-energy theory. Contrary to naive expectations, their central singularity is not resolved by the higher derivative terms present in the action. It is unknown at present if these solutions form as a result of gravitational collapse. The only solution regular everywhere is just the de Sitter metric devoid of any black hole horizon.
description: 15 pages, 1 figure, published version
Προστατευτισμός στη σύγχρονη μορφή του Διεθνούς Εμπορίου
Creators: name: Στεργιούλα, Αθηνά Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Προστατευτισμός
Εμπόριο
Δασμοί
Protectionism
Trade
Tariffs

description: Ο σκοπός αυτής της έρευνας είναι η μελέτη της επιρροής του προστατευτισμού στο διεθνές εμπόριο, η οποία έχει αποτελέσει αντικείμενο μελέτης για πολλούς ερευνητές εδώ και πολλά χρόνια. Το πρώτο πράγμα που απασχόλησε τους μελετητές είναι οι θεωρίες γύρω από το διεθνές εμπόριο, η ερμηνεία όλων των παραγόντων που το επηρεάζουν, μεταξύ αυτών η εκάστοτε σύσταση και λειτουργία κάθε κράτους. Καθ’ όλη τη διάρκεια της μεταπολεμικής περιόδου στην ιστορία έγιναν οι πιο πολλές προσπάθειες για την τιθάσευση του προστατευτισμού με στόχο τη συμμετοχή όλων των κρατών στο διεθνές εμπόριο και τον περιορισμό των αθέμιτων μέσων υπεροχής. Σήμερα αρκετοί ερευνητές υποστηρίζουν πως το ελεύθερο εμπόριο προσφέρει πολλά οφέλη. Η παρούσα μελέτη, λαμβάνει υπόψιν τα ιστορικά γεγονότα και τις οικονομικές θεωρίες, αλλά τα κύρια συμπεράσματα της εξάγονται από την οικονομετρική διερεύνηση της σημασίας της έντασης και της ευκολίας ανάπτυξης των εμπορικών σχέσεων (μετρούμενες με τη βοήθεια του Enabling Trade Index 2014, ETI) για το ΑΕΠ, τον βαθμό εξωστρέφειας και το εμπορικό ισοζύγιο. Ο διαχωρισμός του συνολικού δείκτη ETI σε επιμέρους δείκτες και πυλώνες μας βοηθά να αναδείξουμε πιο συγκεκριμένα τις επιπτώσεις επιμέρους θεσμικών, οικονομικών και κοινωνικών χαρακτηριστικών. Συνολικά, τα πιο σημαντικά αποτελέσματα επικεντρώνονται σε δύο δείκτες οι οποίοι επηρεάζουν τη φιλελευθεροποίηση του εμπορίου
description: The purpose of this research is the influence that protectionism has on international trade, which has been the subject of research for many researchers over the past years. The first thing that got scholars interest was the theories about international trade, the interpretation of all the factors that influence it, as well as the composition and functioning of each state. Most efforts have been made to uphold the rules of trade in favor of protectionism with a view to involving every state in international trade and limiting unfair means of supremacy have been made during the post-war period. Nowadays, many researchers state that free trade comes with many benefits. The present study takes into consideration historical facts and economic theories, but its main conclusions are drawn from establishing an econometric relationship with the help of the Enabling Trade Index 2014 and its constituent elements. By dividing the pointer into individual parts, we can point out where a form of protectionism can be applied or detected. In total, the most important results focus on two indicators that affects trade liberalization
Οι κανόνες ιδιωτικού διεθνούς δικαίου των κρατών μελών της ΕΕ αναφορικά με τις εταιρίες και η σχέση τους με τις διατάξεις της ΣΛΕΕ που αφορούν την ελευθερία εγκατάστασης
Creators: name: Καμάκα, Σταματία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: νομικά πρόσωπα
εφαρμοστέο δίκαιο
ελευθερία εγκατάστασης
legal entities
applicable law
freedom of establishment

description: Στόχος της παρούσας μεταπτυχιακής διπλωματικής εργασίας είναι να προσδιορίσει τον βαθμό επίδρασης του ενωσιακού δικαίου και συγκεκριμένα της ελευθερίας εγκαταστάσεως στους κανόνες ιδιωτικού διεθνούς δικαίου των κρατών μελών της ΕΕ αναφορικά με τις εταιρίες. Για τον σκοπό αυτό κρίνεται αναγκαία η παράθεση σε πρώτο στάδιο των επιμέρους θεωριών που έχουν υποστηριχτεί ως προς το εφαρμοστέο δίκαιο στις εταιρικές σχέσεις και η υλοποίηση εν συνεχεία μίας συγκριτικής προσέγγισης των σχετικών κανόνων των δικαιικών συστημάτων της ΕΕ που θα μπορούσαν να χαρακτηριστούν κύριοι εκπρόσωποι για τις κυριαρχούσες θεωρίες. Ακολούθως, θα αναλυθεί η έννοια της ελευθερίας εγκατάστασης όπως αυτή προσδιορίζεται στην ΣΛΕΕ και ερμηνεύεται από το Δικαστήριο. Επ’ αυτής της ανάλυσης θα σημειωθούν συμπερασματικές παρατηρήσεις αναφορικά με την επίδραση του ενωσιακού δικαίου στο εταιρικό ιδιωτικό διεθνές δίκαιο των κρατών μελών. Τέλος, θα εξεταστεί η στάση των κρατών μελών ως προς τον βαθμό επίδρασης του δικαίου της ΕΕ στην εθνική τους νομοθεσία μέσα από τα παραδείγματα της Γερμανίας και της Ελλάδας
description: The aim of this master thesis is to determine the extent to which EU law, in particular freedom of establishment, influences the rules of private international law of EU Member States regarding companies. To this end, it is necessary to mention the individual theories that have been supported regarding the applicable law in corporate affairs and then to implement a comparative approach to the relevant rules of EU legal systems that could be characterized as the main representatives for dominant theories. Subsequently, the concept of freedom of establishment will be analyzed, as defined in the TFEU and interpreted by the Court. This analysis will provide concluding remarks on the impact of EU law on corporate private international law of the Member States. In conclusion, the position of Member States' will be examined, on the extent to which EU law affects their national legislation, through the examples of Germany and Greece
BC-SIM-TN-004 SIMBIO-SYS_FOP_update_after_NECP_12May2019
Creators: name: SIMIONI, EMANUELE
name: ZUSI, MICHELE
name: CICCHETTI, ANDREA
name: POLITI, ROMOLO
name: Noscese Raffaella
name: CAPACCIONI, FABRIZIO
name: CAPRIA, MARIA TERESA
name: Doressoundiram, Alain
name: Langevin, Yves
name: PALUMBO, PASQUALE
name: Vincendon, Mathieu
name: CREMONESE, Gabriele
Publisher: name: O.A. Padova
Year: 2019

description: This document, in according to the Spectrometers and Imagers for MPO BepiColombo Integrated Observatory SYStem (SIMBIO-SYS) Technical Note, Layout and Data flow agreement reports all the Flight Operation Procedures (FOPs) SIMBIO-SYS to be used during the operational phases of the instrument. It conseiders all the improvements made after the Near Earth Commissioning Phase (NECP) and before ICO1 phase. Differently from the date in the header, present Technical Note refers to activities performed between December 2018 and June 2019 partially anticipated in BC-SIM-TN-001-SIMBIOSYS_FOPs_Description_Issue1
Επισκόπηση στην Ευρωπαϊκή Ρευστότητα μέσω Ανάλυσης Παραγόντων
Creators: name: Τζάτσης, Δημήτριος Δήμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ρευστότητα
Ανάλυση Παραγόντων
Ευρώπη
Liquidity
Factor Analysis
Europe

description: Η παρούσα διπλωματική εργασία προσπαθεί να εξάγει κάποια συμπεράσματα για την ρευστότητα εντός των τειχών της Ευρώπης έπειτα από μια επισκόπηση που γίνεται στις υπάρχουσες οικονομικές αναλύσεις διαχρονικά, δίνοντας εν τέλει μεγαλύτερο βάρος στην ανάλυση παραγόντων. Επεξηγώντας λεπτομερώς τις έννοιες της ρευστότητας, της Ευρωπαϊκής Ένωσης και αναφέροντας την θεωρία της ανάλυσης παραγόντων καλύπτεται το περίβλημα ώστε να γίνει εμφανές, πώς οι διάφορες έρευνες που εμπεριέχουν αυτά τα τρία διαφορετικά μέρη τα συνδυάζουν με τέτοιο τρόπο ώστε να αναδύονται στην επιφάνεια χρήσιμα αποτελέσματα για την οικονομία και τρόπο άσκησης οικονομικών πολιτικών
description: This Thesis seeks to draw some conclusions about liquidity within the walls of Europe following an overview of existing economic analyses over time, ultimately giving greater weight to the analysis of factors. In explaining in detail the concepts of liquidity, the European Union and mentioning the theory of factor analysis, the enclosure is covered to make it clear that the various surveys involving these three different parts combine them in such a way that useful results for the economy emerge on the surface and how to pursue economic policies
A study of some rare eta-meson decays
Creators: name: Peters, Daniel J.
Publisher: name: University of British Columbia
Year: 2009

description: Previous calculations of the rate of the decay η → π⁰ γγ have fallen short of the experimental result, 0.84 ± 0.18 eV. One such calculation, that of vector meson dominance (VMD), is included herein (giving 0.29₋₀.₁₂⁺⁰¹⁶ eV), and moreover is modified by the inclusion of an added ingredient, the scalar meson α₀. The added mechanism does not adequately fix the result; assuming constructive interference the calculated rate becomes 0.37₋₀.₁₅⁺⁰²⁰ eV. The rate is then calculated according to a quark-box mechanism, where the ηqq and πqq couplings are fixed by the rates of the η→γγ and π⁰→ γγ decays. With constituent quark masses of 300 MeV for u and d quarks the calculated rate is 0.70±0.12 eV, which is in good agreement with experiment. Lower bounds (the unitarity limits) for the decays η → π⁰ e⁺e⁻ and η → π⁰ μ⁺ μ⁻ are calculated, using the intermediate state π⁰ γγ. The available experimental information is inadequate for purposes of a model-free calculation of these unitarity limits; therefore, the models considered for η → π⁰ γγ are used in these calculations. Using the quark box mechanism as above, the unitarity limits are 2.9 ± 0.5 μeV and 4.3 ± 0.7 μeV, for η → π⁰e⁺e⁻ and η → π⁰ μ⁺ μ⁻ respectively. These results show that the measurement of these (as yet unseen) modes at η factories such as that of Saturne can be expected.
ДИАГНОСТИКА СИНДРОМА РАЗДРАЖЕННОГО КИШКИ У ПОДРОСТКОВ С ПОМОЩЬЮ ИММУНОЛОГИЧЕСКОГО АНАЛИЗА
Creators: name: Расулова, Саодат
Publisher: name: Zenodo
Year: 2023

description: Синдрома раздраженного кишечника – серьезная и недооцененная проблема детского возраста. Этот тема недостаточно изучена в педиатрии по сравнению со взрослой практикой, и педиатры часто без должного обоснования ставят этот диагноз детям раннего возраста. В диссертации диагностика синдрома раздраженного кишечника у школьников-подростков с помощью иммунологических тестов речь идет.
DNS of bifurcations in an air-filled rotating baroclinic annulus
Creators: name: Randriamampianina, Anthony
name: Fruh, Wolf-Gerrit
name: Read, Peter L.
name: Maubert, Pierre
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geophysics (physics.geo-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Three-dimensional Direct Numerical Simulation (DNS) on the nonlinear dynamics and a route to chaos in a rotating fluid subjected to lateral heating is presented here and discussed in the context of laboratory experiments in the baroclinic annulus. Following two previous preliminary studies by Maubert and Randriamampianina, the fluid used is air rather than a liquid as used in all other previous work. This study investigated a bifurcation sequence from the axisymmetric flow to a number of complex flows. The transition sequence, on increase of the rotation rate, from the axisymmetric solution via a steady, fully-developed baroclinic wave to chaotic flow followed a variant of the classical quasi-periodic bifurcation route, starting with a subcritical Hopf and associated saddle-node bifurcation. This was followed by a sequence of two supercritical Hopf-type bifurcations, first to an amplitude vacillation, then to a three-frequency quasi-periodic modulated amplitude vacillation (MAV), and finally to a chaotic MAV\@. In the context of the baroclinic annulus this sequence is unusual as the vacillation is usually found on decrease of the rotation rate from the steady wave flow. Further transitions of a steady wave with a higher wave number pointed to the possibility that a barotropic instability of the side wall boundary layers and the subsequent breakdown of these barotropic vortices may play a role in the transition to structural vacillation and, ultimately, geostrophic turbulence.
description: 31 pages
Local polarization and isothermal local equilibrium in relativistic heavy ion collisions
Creators: name: Becattini, F.
name: Buzzegoli, M.
name: Inghirami, G.
name: Karpenko, I.
name: Palermo, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the inclusion of a recently found additional term of the spin polarization vector at local equilibrium which is linear in the symmetrized gradients of the velocity field, and the assumption of hadron production at constant temperature restore the quantitative agreement between hydrodynamic model predictions and local polarization measurements in relativistic heavy ion collisions at $\sqrt{s_{\rm NN}} = 200$ GeV. The longitudinal component of the spin polarization vector turns out to be very sensitive to the temperature value, with a good fit around 155 MeV. The implications of this finding are discussed.
description: 6 pages, 6 figures. Version accepted for publication in Phys.Rev.Lett
Exploring social determinants of health among MPH students in Saudi Arabia
Creators: name: Baraa Alghalyini
name: Shahd Hosam  Alyousof
name: Bader Abou  Shaar
Publisher: name: F1000 Research Limited
Year: 2024

description: The social determinants of health (SDOH) encompass the conditions influencing individuals from birth through aging, shaping their daily existence. These factors span a wide spectrum, encompassing political and legal status, economic circumstances, personal and family stability, education, employment, transportation, and the physical environment. Addressing SDOH necessitates personalized strategies derived from thorough needs assessments and effective screening tools. We aimed to investigate the knowledge, attitudes, and experiences of Master's in Public Health (MPH) students concerning social determinants of health (SDOH), screening, and their contextual impact on professional practice, and to identify challenges associated with SDOH utilization within the Saudi healthcare system. This is a qualitative phenomenological study. The researchers collected data through semi-structured, one-on-one interviews with students at Alfaisal University’s Master of Public Health program. The researchers recorded the interviews, transcribed the data, and coded them. Thematic content analysis was used to process and obtain the data results. The study included 16 MPH students registered at Alfaisal University’s Master of Public Health program. The participants' perspectives revealed four main themes: the interplay of interconnected factors, the significance of screening tools in addressing SDOH, influences shaping students' learning, and motivations driving the learning process. Public Health students in Alfaisal University demonstrate awareness of SDOH and their link to overall well-being. The students encounter obstacles when attempting to apply SDOH principles within the Saudi healthcare settings. However, ongoing transformation programs provide an opportunity to adopt new models to overcome these obstacles and address social determinants of health effectively.
Refereeing referrals: Facilitated prioritisation and referral practice in an environment of psychological safety builds confidence in medical students and prepares them for the realities of work in hospitals
Creators: name: Williams, Mattie
Publisher: name: F1000 Research Limited
Year: 2024

description: A series of interactive seminars presented students with a virtual ‘triage room’ of 5-7 patients with minimal information (age, sex, presenting complaint). Students are then able to request two to three ‘bedside investigations or history questions’ (observations, ECG, closed question etc) to aid prioritisation. 



Detailed case discussions of each patient follow, in order of acuity as determined by the students, with opportunity to request and interpret appropriate investigations. They are then invited to propose a management plan and if the patient requires admission/specialty review they are asked to refer to a simulated senior (seminar facilitator). 



On completion of assessing the set of cases, the students are asked to re-assess their initial prioritisation and reflect on triaging and referrals.
Κίνητρα επίτευξης, αποδόσεις αιτιών και σχολική επίδοση μαθητών πρωτοβάθμιας με και χωρίς μαθησιακές δυσκολίες
Creators: name: Κοκκινίδου, Ιωάννα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Μαθησιακές δυσκολίες
Κίνητρα
Στόχοι επίτευξης
Learning disabilities
Motivation
Achievement goals

description: Η παρούσα εργασία πραγματεύεται το ζήτημα της σχολικής επίδοσης των μαθητών με μαθησιακές δυσκολίες καθώς και των κινήτρων επίτευξης και τις αποδόσεις των αιτιών σε σύγκριση με τους μαθητές τυπικής ανάπτυξης. Σκοπός της είναι να εντοπιστούν οι διαφορές που παρατηρούνται στην επίδοση μεταξύ των δυο ομάδων μαθητών, στους στόχους επίτευξης και τις αποδόσεις αιτιών και να αναδειχθούν οι παράγοντες που σχετίζονται με την εσωτερική και εξωτερική παρώθηση για την ενεργοποίηση των μαθητών για συμμετοχή στην εκπαιδευτική διαδικασία και βελτίωση της επίδοσής τους.
description: This paper discusses the issue of school performance of students with learning disabilities as well as achievement motivations and causes of performance compared to students of formal development. Its purpose is to identify the differences in performance between the two groups of students, in achieving the goals and performance of causes and to highlight the factors related to internal and external motivation to activate students to participate in the educational process and improve their performance.
Electron beam transverse phase space tomography using nanofabricated wire scanners with submicrometer resolution
Creators: name: Hermann, Benedikt
name: Guzenko, Vitaliy A.
name: Hürzeler, Orell R.
name: Kirchner, Adrian
name: Orlandi, Gian Luca
name: Prat, Eduard
name: Ischebeck, Rasmus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Characterization and control of the transverse phase space of high-brightness electron beams is required at free-electron lasers or electron diffraction experiments for emittance measurement and beam optimization as well as at advanced acceleration experiments. Dielectric laser accelerators or plasma accelerators with external injection indeed require beam sizes at the micron level and below. We present a method using nano-fabricated metallic wires oriented at different angles to obtain projections of the transverse phase space by scanning the wires through the beam and detecting the amount of scattered particles. Performing this measurement at several locations along the waist allows assessing the transverse distribution at different phase advances. By applying a novel tomographic algorithm the transverse phase space density can be reconstructed. Measurements at the ACHIP chamber at SwissFEL confirm that the transverse phase space of micrometer-sized electron beams can be reliably characterized using this method.
A two-phase argon avalanche detector operated in a single electron counting mode
Creators: name: Bondar, A.
name: Buzulutskov, A.
name: Grebenuk, A.
name: Pavlyuchenko, D.
name: Snopkov, R.
name: Tikhonov, Y.
name: Kudryavtsev, V. A.
name: Lightfoot, P. K.
name: Spooner, N. J. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The performance of a two-phase Ar avalanche detector in a single electron counting mode was studied, with regard to potential application in coherent neutrino-nucleus scattering and dark matter search experiments. The detector comprised of a 1 cm thick liquid Ar layer and a triple-GEM multiplier operated in the saturated vapour above the liquid phase. Successful operation of the detector in single electron counting mode, in the gain range from 6000 to 40000, has for the first time been demonstrated.
description: 9 pages, 9 figures. Submitted to JINST
Analysis and modeling of low-cost air quality sensor data towards their computational improvement
Creators: name: Ζημιανίτης, Πέτρος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ποιότητα Αέρα
Αισθητήρες χαμηλού κόστους
Μηχανική μάθηση
Air quality
Low-cost air quality sensors
Machine Learning

description: This study contributes to the computational improvement of particulate matter measurements performed by low-cost air quality optical sensors with the use of computational intelligence algorithms. Such sensors do not produce measurements of high accuracy due to limitations in the technology they employ and also due to the influence of environmental parameters such as relative humidity. The current research tackles this problem using machine learning algorithms to improve sensor performance. These algorithms include feedforward neural networks, random forest algorithms and Long Short-Term Memory neural networks and are tested for two low cost air quality systems. In an effort to make the models as accurate and high performing as possible, a specific data preparation is proposed. After an extensive feature selection procedure, the trained models prove be reliable. The LSTM models prove to be the best performing ones with the feedforward models not being far off, both greatly improving the relative expanded uncertainty of the measurements.
description: Αυτή η μελέτη συμβάλλει στην υπολογιστική βελτίωση των μετρήσεων σωματιδίων PM που πραγματοποιούνται από οπτικούς αισθητήρες ποιότητας αέρα χαμηλού κόστους με τη χρήση αλγορίθμων υπολογιστικής νοημοσύνης. Τέτοιοι αισθητήρες δεν παράγουν μετρήσεις υψηλής ακρίβειας λόγω περιορισμών στην τεχνολογία που χρησιμοποιούν και επίσης λόγω της επίδρασης περιβαλλοντικών παραμέτρων όπως η σχετική υγρασία. Η τρέχουσα έρευνα αντιμετωπίζει αυτό το πρόβλημα χρησιμοποιώντας αλγόριθμους μηχανικής μάθησης για τη βελτίωση της απόδοσης των αισθητήρων. Αυτοί οι αλγόριθμοι περιλαμβάνουν νευρονικά δίκτυα, τυχαίους αλγόριθμους δασών και νευρωνικά δίκτυα LSTM και δοκιμάζονται για δύο συστήματα ποιότητας αέρα χαμηλού κόστους. Σε μια προσπάθεια να καταστούν τα μοντέλα όσο το δυνατόν ακριβέστερα και υψηλότερης απόδοσης, προτείνεται μια συγκεκριμένη προετοιμασία δεδομένων. Μετά από μια εκτενή διαδικασία επιλογής μεταβλητών, τα εκπαιδευμένα μοντέλα αποδεικνύονται αξιόπιστα. Τα μοντέλα LSTM αποδεικνύονται τα καλύτερα σε απόδοση, με τα μοντέλα απλών νευρονικών δικτύων να ακολουθούν, βελτιώνοντας σημαντικά το σχετική διευρυμένη αβεβαιότητα των μετρήσεων.
Dynamics of a classical Hall system driven by a time-dependent Aharonov--Bohm flux
Creators: name: Asch, J.
name: Stovicek, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the dynamics of a classical particle moving in a punctured plane under the influence of a strong homogeneous magnetic field, an electrical background, and driven by a time-dependent singular flux tube through the hole. We exhibit a striking classical (de)localization effect: in the far past the trajectories are spirals around a bound center; the particle moves inward towards the flux tube loosing kinetic energy. After hitting the puncture it becomes ``conducting'': the motion is a cycloid around a center whose drift is outgoing, orthogonal to the electric field, diffusive, and without energy loss.
Anomaly Detection Under Multiplicative Noise Model Uncertainty
Creators: name: Renganathan, Venkatraman
name: Gravell, Benjamin J.
name: Ruths, Justin
name: Summers, Tyler H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: State estimators are crucial components of anomaly detectors that are used to monitor cyber-physical systems. Many frequently-used state estimators are susceptible to model risk as they rely critically on the availability of an accurate state-space model. Modeling errors make it more difficult to distinguish whether deviations from expected behavior are due to anomalies or simply a lack of knowledge about the system dynamics. In this research, we account for model uncertainty through a multiplicative noise framework. Specifically, we propose to use the multiplicative noise LQG based compensator in this setting to hedge against the model uncertainty risk. The size of the residual from the estimator can then be compared against a threshold to detect anomalies. Finally, the proposed detector is validated using numerical simulations. Extension of state-of-the-art anomaly detection in cyber-physical systems to handle model uncertainty represents the main novel contribution of the present work.
Studies of the flux flow resistivity in YBa₂Cu₃O₆ 95 by microwave techniques
Creators: name: Morgan, David Craig
Publisher: name: University of British Columbia
Year: 2009

description: Measurements of the microwave surface resistance at 5.4, 27 and 35 GHz on a high quality single crystal of YBa₂Cu₃O₆.₉₅ in magnetic fields up to 8T (applied parallel to the c-axis) and at temperatures from 20K to ]00K are presented. The Coffey-Clem expression for the surface impedance of a superconductor in the mixed state is used to fit the data in terms of a pinning frequency and a free flux flow resistivity (thermal hopping of vortices is not included since it is not important for YBa₂Cu₃O₆.₉₅ at microwave frequencies). A temperature dependent pinning frequency is found that varies from ~20 GHz at 20K to effectively zero by 80K. The flux flow resistivity is strongly temperature dependent and consistent, down to at least 50K, with the Bardeen-Stephen expression pff/pn (T) = H/Hc₂(T) if an extrapolation of the linear normal state resistivity from above Tc is used for pn (T). This suggests that the traditional picture of a vortex core as a cylinder of normal material may be valid in these materials. In contrast, the normal fluid quasiparticle scattering rate, as determined by zero field microwave measurements on the same single crystals¹, drops precipitously below Tc and, thus, is probably not the relevant scattering rate for the charge carriers in the vortex core.
Additional file 3 of The functions of ocu-miR-205 in regulating hair follicle development in Rex rabbits
Creators: name: Liu, Gongyan
name: Li, Shu
name: Liu, Hongli
name: Zhu, Yanli
name: Bai, Liya
name: Sun, Haitao
name: Gao, Shuxia
name: Jiang, Wenxue
name: Li, Fuchang
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 3: Supplementary Table 3. Statistics of sequence data of each samples.
Symmetry and inert states of spin Bose Condensates
Creators: name: Yip, S. -K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We construct the list of all possible inert states of spin Bose condensates for $S \le 4$. In doing so, we also obtain their symmetry properties. These results are applied to classify line defects of these spin condensates at zero magnetic field.
description: an error in Sec III C corrected
Relic density of neutralino dark matter in the MSSM with CP violation
Creators: name: Belanger, G.
name: Boudjema, F.
name: Kraml, S.
name: Pukhov, A.
name: Semenov, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate the relic density of dark matter in the MSSM with CP violation. We analyse various scenarios of neutralino annihilation: the cases of a bino, bino-wino and bino-Higgsino LSP, annihilation through Higgs, as well as sfermion coannihilation scenarios. Large phase effects are found, on the one hand due to shifts in the masses, on the other hand due to modifications of the couplings. Taking special care to disentangle the effects in masses and couplings, we demonstrate that the presence of CP phases can have a significant influence on the neutralino relic abundance. Typical variations in Ωh^2 solely from modifications in the couplings are O(10%-100%), but can reach an order of magnitude in some cases.
description: 36 pages, 21 figures (low resolution). A version with high-resolution figures can be downloaded from http://cern.ch/kraml/papers/omcp
Χριστιανισμός και Πολιτική στη σύγχρονη κοινωνία
Creators: name: Ταλαμπίρης, Γρηγόριος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Χριστιανισμός
Πολιτική
Σύγχρονη κοινωνία
Christianity
Politics
Modern society

description: Σκοπός της μεταπτυχιακής αυτής εργασίας είναι η ανάλυση και αποτύπωση των συσχετισμών που προκύπτουν μέσα από τη διάδραση του Χριστιανισμού και της Πολιτικής στο σύγχρονο κόσμο. Αρχικά, γίνεται μια εννοιολογική αναδίφηση ως προς την έννοια της πολιτικής και της θρησκείας ευρύτερα, όπως αυτή πραγματώνεται μέσα από το ζήτημα των πολιτισμικών ταυτοτήτων, το ρόλο της εθνικής ταυτότητας και του εθνικισμού, της εκκοσμίκευσης και του θρησκευτικού φονταμενταλισμού. Εν συνεχεία, γίνεται λόγος για την προτεσταντική επανάσταση και τον αντίκτυπο αυτής μέχρι σήμερα. Παράλληλα, παρατίθεται η σχέση Χριστιανισμού και πολιτικής μέσω της διάστασης της Ορθόδοξης παράδοσης και της ιστορικής συνάντησής του με τον κομμουνισμό- αθεΐα. Ακόμη, σημειώνεται το περιεχόμενο της Θεολογίας της Απελευθέρωσης και ο αντίκτυπος αυτής στην πολιτική, κοινωνική και εκκλησιαστική ζωή της Λατινικής Αμερικής. Τέλος, γίνεται μια σφαιρική και ολιστική αποτύπωση των επιδράσεων και της ώσμωσης όλων αυτών των γεγονότων που προαναφέρονται, υπό το πρίσμα παγκοσμιοποίησης, εστιάζοντας στο ρόλο που καλείται να διαδραματίσει ο Χριστιανισμός υπό αυτές τις συνθήκες σήμερα
description: The purpose of this postgraduate thesis is to analyze and capture the correlations that emerge through the interaction of Christianity and Politics in the modern world. Initially, there is a conceptual rethinking of the concept of politics and religion more broadly, as it is realized through the question of cultural identities, the role of national identity and nationalism, secularism and religious fundamentalism. Then there is the Protestant revolution and its impact to this day. At the same time, the relationship between Christianity and politics is presented through the dimension of the Orthodox tradition and its historical encounter with communism-atheism. The content of the Theology of Liberation and its impact on the political, social and ecclesiastical life of Latin America are also noted. Finally, a comprehensive and holistic account of the effects and osmosis of all these events that have been mentioned above is presented, in the light of globalization, focusing on the role that Christianity is called to play under these conditions today
Diffusive Synchrotron Radiation from Pulsar Wind Nebulae
Creators: name: Fleishman, G. D.
name: Bietenholz, M. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Diffusive Synchrotron Radiation (DSR) is produced by charged particles as they random walk in a stochastic magnetic field. The spectrum of the radiation produced by particles in such fields differs substantially from those of standard synchrotron emission because the corresponding particle trajectories deviate significantly from gyration in a regular field. The Larmor radius, therefore, is no longer a good measure of the particle trajectory. In this paper we analyze a special DSR regime which arises as highly relativistic electrons move through magnetic fields which have only random structure on a wide range of spatial scales. Such stochastic fields arise in turbulent processes, and are likely present in pulsar wind nebulae (PWNe). We show that DSR generated by a single population of electrons can reproduce the observed broad-band spectra of PWNe from the radio to the X-ray, in particular producing relatively flat spectrum radio emission as is usually observed in PWNe. DSR can explain the existence of several break frequencies in the broad-band emission spectrum without recourse to breaks in the energy spectrum of the relativistic particles. The shape of the radiation spectrum depends on the spatial spectrum of the stochastic magnetic field. The implications of the presented DSR regime for PWN physics are discussed.
description: 15 pages, 5 figures, accepted to MNRAS