cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Constraining the nature of High Frequency Peakers. II. Polarization properties
Creators: name: Orienti, M.
name: Dallacasa, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: The ``bright'' High Frequency Peakers (HFPs) sample is a mixture of blazars and intrinsically small and young radio sources. We investigate the polarimetric characteristics of 45 High Frequency Peakers, from the ``bright'' HFP sample, in order to have a deeper knowledge of the nature of each object, and to construct a sample made of genuine young radio sources only. Methods: Simultaneous VLA observations carried out at 22.2, 15.3, 8.4 and 5.0 GHz, together with the information at 1.4 GHz provided by the NVSS at an earlier epoch, have been used to study the linearly polarized emission. Results: From the analysis of the polarimetric properties of the 45 sources we find that 26 (58%) are polarized at least at one frequency, while 17 (38%) are completely unpolarized at all frequencies. We find a correlation between fractional polarization and the total intensity variability. We confirm that there is a clear distinction between the polarization properties of galaxies and quasars: 17 (66%) quasars are highly polarized, while all the 9 galaxies are either unpolarized (<0.2%) or marginally polarized with fractional polarization below 1%. This suggests that most HFP candidates identified with quasars are likely to represent a radio source population different from young radio objects.
description: 9 pages, 2 figures; accepted for publication in A&A
Irreducible 3-manifolds that cannot be obtained by 0-surgery on a knot
Creators: name: Hedden, Matthew
name: Kim, Min Hoon
name: Mark, Thomas E.
name: Park, Kyungbae
Publisher: name: arXiv
Year: 2018
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We give two infinite families of examples of closed, orientable, irreducible 3-manifolds $M$ such that $b_1(M)=1$ and $π_1(M)$ has weight 1, but $M$ is not the result of Dehn surgery along a knot in the 3-sphere. This answers a question of Aschenbrenner, Friedl and Wilton, and provides the first examples of irreducible manifolds with $b_1=1$ that are known not to be surgery on a knot in the 3-sphere. One family consists of Seifert fibered 3-manifolds, while each member of the other family is not even homology cobordant to any Seifert fibered 3-manifold. None of our examples are homology cobordant to any manifold obtained by Dehn surgery along a knot in the 3-sphere.
description: 18 pages, 8 figures; final version, to appear in Transactions of the AMS
title: Geschlecht, Subjekt und Macht empirisch erforschen, methodologisch neu denken : Ansätze für einen dekonstruktivistischen Blick auf vergeschlechtlichte Subjektwerdung
Creators: name: Conrads, Judith
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: Dekonstruktion
subject: Geschlechterkonstruktion
subject: Gruppendiskussion
subject: Macht
subject: Subjekt
subject: ddc:303

description: Anhand einer qualitativen Studie zu vergeschlechtlichter Subjektwerdung Jugendlicher zeigt der Beitrag auf, wie eine diskursorientierte und dekonstruktivistische Analyse mit dem Fokus auf Subjekt, Geschlecht und gesellschaftliche Machtverhältnisse methodisch erfolgen kann. Für die empirische Analyse vergeschlechtlichter Subjektivierung werden Gruppendiskussionen mit der Grounded-Theory-Methodologie (GTM) verbunden. Das Spezifikum von Gruppendiskussionen, das aufeinander bezogene Sprechen, steht hierbei in poststrukturalistischer Rahmung im Mittelpunkt und bietet einen fruchtbaren Ansatzpunkt für feministische Fragestellungen.
Wilson Loops in Non-Compact U(1) Gauge Theories at Criticality
Creators: name: Metlitski, Max A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the properties of Wilson loops in three dimensional non-compact U(1) gauge theories with global abelian symmetries. We use duality in the continuum and on the lattice, to argue that close to the critical point between the Higgs and Coulomb phases, all correlators of the Wilson loops are periodic functions of the Wilson loop charge, Q. The period depends on the global symmetry of the theory, which determines the magnetic flux carried by the dual particles. For single flavour scalar electrodynamics, the emergent period is Q = 1. In the general case of N complex scalars with a U(1)^{N-1} global symmetry, the period is Q = N. We also give some arguments why this phenomenon does not generalize to theories with a full non-abelian SU(N) symmetry, where no periodicity in Q is expected. Implications for lattice simulations, as well as for physical systems, such as easy plane antiferromagnets and disordered superfluids, are noted.
description: 25 pages, 1 figure
X-ray Emitting Ejecta in Puppis A Observed with Suzaku
Creators: name: Hwang, Una
name: Petre, Robert
name: Flanagan, Kathryn A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection and localization of X-ray emitting ejecta in the middle-aged Galactic supernova remnant Puppis A using five observations with the Suzaku X-ray Imaging Spectrometer to survey the eastern and middle portions of the remnant. A roughly 3' by 5', double-peaked region in the north center is found to be highly enriched in Si and other elements relative to the rest of the remnant. The X-ray fitted abundances are otherwise well below the solar values. While the ejecta-enhanced regions show some variation of relative element abundances, there is little evidence for a very strong enhancement of one element over the others in the imaged portion of the remnant, except possibly for a region of O and Ne enhancement in the remnant's south center. There is no spatial correlation between the compact [O III] emitting ejecta knots seen optically and the abundance enhancements seen in X-rays, although they are located in the same vicinity. The map of fitted column density shows strong variations across the remnant that echo earlier X-ray spectral hardness maps. The ionization age (as fitted for single temperature models) is sharply higher in a ridge behind the northeast-east boundary of the remnant, and is probably related to the strong molecular cloud interaction along that boundary. The temperature map, by comparison, shows relatively weak variations.
description: 25 pages latex, 6 postscript figures; ApJ, in press
Normal edge-colorings of cubic graphs
Creators: name: Mazzuoccolo, Giuseppe
name: Mkrtchyan, Vahan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: A normal $k$-edge-coloring of a cubic graph is an edge-coloring with $k$ colors having the additional property that when looking at the set of colors assigned to any edge $e$ and the four edges adjacent it, we have either exactly five distinct colors or exactly three distinct colors. We denote by $χ'_{N}(G)$ the smallest $k$, for which $G$ admits a normal $k$-edge-coloring. Normal $k$-edge-colorings were introduced by Jaeger in order to study his well-known Petersen Coloring Conjecture. More precisely, it is known that proving $χ'_{N}(G)\leq 5$ for every bridgeless cubic graph is equivalent to proving Petersen Coloring Conjecture and then, among others, Cycle Double Cover Conjecture and Berge-Fulkerson Conjecture. Considering the larger class of all simple cubic graphs (not necessarily bridgeless), some interesting questions naturally arise. For instance, there exist simple cubic graphs, not bridgeless, with $χ'_{N}(G)=7$. On the other hand, the known best general upper bound for $χ'_{N}(G)$ was $9$. Here, we improve it by proving that $χ'_{N}(G)\leq7$ for any simple cubic graph $G$, which is best possible. We obtain this result by proving the existence of specific no-where zero $\mathbb{Z}_2^2$-flows in $4$-edge-connected graphs.
description: 17 pages, 6 figures
Additional file 1: of Current management of juvenile dermatomyositis in Germany and Austria: an online survey of pediatric rheumatologists and pediatric neurologists
Creators: name: Hinze, Claas
name: Speth, Fabian
name: Oommen, Prasad
name: Johannes-Peter Haas
Publisher: name: figshare
Year: 2018
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Science Policy

description: Case Scenarios used in the online survey. (PDF 123 kb)
Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure
Creators: name: Carisch, Christian
name: Romito, Alessandro
name: Zilberberg, Oded
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The evolution of a quantum system subject to measurements can be described by stochastic quantum trajectories of pure states. Instead, the ensemble average over trajectories is a mixed state evolving via a master equation. Both descriptions lead to the same expectation values for linear observables. Recently, there is growing interest in the average entanglement appearing during quantum trajectories. The entanglement is a nonlinear observable that is sensitive to so-called measurement-induced phase transitions, namely, transitions from a system-size dependent phase to a quantum Zeno phase with area-law entanglement. Intriguingly, the mixed steady-state description of these systems is insensitive to this phase transition. Together with the difficulty of quantifying the mixed state entanglement, this favors quantum trajectories for the description of the quantum measurement process. Here, we study the entanglement of a single particle under continuous measurements (using the newly developed configuration coherence) in both the mixed state and the quantum trajectories descriptions. In both descriptions, we find that the entanglement at intermediate time scales shows the same qualitative behavior as a function of the measurement strength. The entanglement engenders a notion of coherence length, whose dependence on the measurement strength is explained by a cascade of underdamped-to-overdamped transitions. This demonstrates that measurement-induced entanglement dynamics can be captured by mixed states.
description: 5 pages, 3 figures
title: Διαφοροποιήσεις στα επίπεδα ανεργίας στην Ελλάδα στην περίοδο 2011-2018 σε επίπεδο Περιφέρειας
title: Regional differentials in unemployment in Greece over 2011-2018
titleType: AlternativeTitle
Creators: name: Σταμέλος, Στυλιανός
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Στατιστική ανάλυση
subject: Απασχόληση
subject: Ανεργία

description: Στόχος της διπλωματικής εργασίας είναι η μελέτη και η στατιστική ανάλυση των βασικών χαρακτηριστικών απασχόλησης και ανεργίας στην Ελλάδα με τη χρήση στατιστικών μεθόδων, μέσω των παρεχομένων από την Εθνική Στατιστική Αρχή της Ελλάδος (ΕΛΣΤΑΤ) στοιχείων απασχόλησης και ανεργίας. Στα πλαίσια της διπλωματικής εργασίας, για την εξαγωγή συμπερασμάτων χρησιμοποιούνται το στατιστικό πακέτο SPSS, R και το Ms Excel. Στην παρούσα διπλωματική εργασία επιχειρείται η παρουσίαση και η ανάλυση των βασικών χαρακτηριστικών των απασχολούμενων και των ανέργων κατά τα έτη 2011-2018. Τα βασικά χαρακτηριστικά που παρουσιάζονται και αναλύονται είναι ο αριθμός των απασχολούμενων και ανέργων στο σύνολο, κατά φύλο και ηλιακή ομάδα. Αναλύεται η διαφοροποίηση των ποσοστών ανεργίας διαχρονικά και μεταξύ των Περιφερειών για το χρονικό διάστημα 2011-2018 καθώς και οι διαφοροποιήσεις κατά ηλικιακή ομάδα για αυτό το χρονικό διάστημα. Η ανάλυση πραγματοποιείται με τη χρήση στατιστικών ελέγχων υποθέσεων καθώς και των ανάλογων παραμετρικών και μη παραμετρικών στατιστικών κριτηρίων. Επιπλέον αναλύεται η διάρθρωση της απασχόλησης στους τρεις τομείς οικονομικής δραστηριότητας (Πρωτογενή- Δευτερογενή και Τριτογενή) στις 13 Περιφέρειες για τα έτη 2011 και 2018 με τη χρήση δεικτών απόκλισης και συμμετοχής. Βάση της ανάλυσης κατατάσσονται οι Περιφέρειες ανάλογα με τη συμμετοχή τους στην συνολική απασχόληση της χώρας. Επιπρόσθετα παρουσιάζονται τα στοιχεία απασχόλησης και ανεργίας για το ίδιο χρονικό διάστημα στις χώρες της Ε.Ε στο σύνολο του πληθυσμού και κατά φύλο και ομαδοποιούνται οι χώρες της Ε.Ε σε συστάδες με βάση το ποσοστό ανεργίας που καταγράφεται για το έτος 2018. Κατά το έτος 2018 μεταξύ των χωρών της Ε.Ε στην Ελλάδα καταγράφεται το μικρότερο ποσοστό απασχόλησης τόσο για τους άνδρες όσο και για τις γυναίκες. Αντίστοιχα όσον αφορά το ποσοστό ανεργίας, καταγράφεται το μεγαλύτερο. Ο αριθμός των απασχολούμενων στην Ελλάδα μετά το 2013 παρουσιάζει αυξητική τάση ενώ ο αριθμός των ανέργων παρουσιάζει τάση μείωσης. Ο μεγαλύτερος αριθμός ανέργων καταγράφεται στις Περιφέρειες Αττικής και Κεντρικής Μακεδονίας. Στην Περιφέρεια Δυτικής Μακεδονίας καταγράφονται υψηλά ποσοστά ανεργίας κατά τη διάρκεια αυτής της περιόδου. Οι Περιφέρειες Δυτικής Μακεδονίας και Δυτικής Ελλάδας καταγράφουν τα μεγαλύτερα ποσοστά ανεργίας έναντι των Περιφερειών Νοτίου Αιγαίου, Ιόνιων Νήσων, Πελοποννήσου και Βορείου Αιγαίου που καταγράφονται τα μικρότερα. Στα έτη 2011 και 2018 παρατηρείται αύξηση της απασχόλησης στον τριτογενή τομέα ενώ ο πρωτογενής και ο δευτερογενής τομέας παρουσιάζουν μείωση της απασχόλησης.
Oscillations in Procyon A: First results from a multi-site campaign
Creators: name: Hekker, S.
name: Arentoft, T.
name: Kjeldsen, H.
name: Bedding, T. R.
name: Christensen-Dalsgaard, J.
name: Reffert, S.
name: Bruntt, H.
name: Butler, R. P.
name: Kiss, L. L.
name: O'Toole, S. J.
name: Kambe, E.
name: Ando, H.
name: Izumiura, H.
name: Sato, B.
name: Hartmann, M.
name: Hatzes, A. P.
name: Appourchaux, T.
name: Barban, C.
name: Berthomieu, G.
name: Bouchy, F.
name: Garcia, R. A.
name: Lebrun, J. -C.
name: Martic, M.
name: Michel, E.
name: Mosser, B.
name: Nghiem, P. A. P.
name: Provost, J.
name: Samadi, R.
name: Thevenin, F.
name: Turck-Chiez, S.
name: Bonanno, S. A.
name: Benatti, S.
name: Claudi, R. U.
name: Cosentino, R.
name: Leccia, S.
name: Frandsen, S.
name: Brogaard, K.
name: Grundahl, F.
name: Stempels, H. C.
name: Bazot, M.
name: Dall, T. H.
name: Karoff, C.
name: Carrier, F.
name: Eggenberger, P.
name: Sosnowska, D.
name: Wittenmyer, R. A.
name: Endl, M.
name: Metcalfe, T. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Procyon A is a bright F5IV star in a binary system. Although the distance, mass and angular diameter of this star are all known with high precision, the exact evolutionary state is still unclear. Evolutionary tracks with different ages and different mass fractions of hydrogen in the core pass, within the errors, through the observed position of Procyon A in the Hertzsprung-Russell diagram. For more than 15 years several different groups have studied the solar-like oscillations in Procyon A to determine its evolutionary state. Although several studies independently detected power excess in the periodogram, there is no agreement on the actual oscillation frequencies yet. This is probably due to either insufficient high-quality data (i.e., aliasing) or due to intrinsic properties of the star (i.e., short mode lifetimes). Now a spectroscopic multi-site campaign using 10 telescopes world-wide (minimizing aliasing effects) with a total time span of nearly 4 weeks (increase the frequency resolution) is performed to identify frequencies in this star and finally determine its properties and evolutionary state.
description: 7 pages, 4 figures to be published in the proceedings of HELAS II International Conference: Helioseismology, Asteroseismology and MHD Connections published in the Journal of Physics: Conference Series. High resolution colour figures can be provided on request
Structure-reactivity relationships in metal sulfide/C3N4 based semiconductor catalysts used for photocatalytic H2 evolution
Creators: name: Poonchi Sivasankaran, Ramesh
Publisher: name: Universität Rostock
Year: 2019
Subjects: subject: 540 Chemistry & allied sciences

description: The present work elucidates the synthesis of metal sulfide/carbon nitride composites and their application in photocatalytic hydrogen generation with Pt as co-catalyst in the presence of triethanolamine or lactic acid as sacrificial reductants. However, the formation mechanism of photogenerated charge carriers as well as their separation and transfer during the photocatalytic reaction is still not clear, though its complete understanding is inevitable in order to tune the photocatalytic properties for achieving high photocatalytic H2 production efficiency. We synthesized C3N4 based composites.
Learning Multi-Pursuit Evasion for Safe Targeted Navigation of Drones
Creators: name: Xiao, Jiaping
name: Feroskhan, Mir
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Safe navigation of drones in the presence of adversarial physical attacks from multiple pursuers is a challenging task. This paper proposes a novel approach, asynchronous multi-stage deep reinforcement learning (AMS-DRL), to train adversarial neural networks that can learn from the actions of multiple evolved pursuers and adapt quickly to their behavior, enabling the drone to avoid attacks and reach its target. Specifically, AMS-DRL evolves adversarial agents in a pursuit-evasion game where the pursuers and the evader are asynchronously trained in a bipartite graph way during multiple stages. Our approach guarantees convergence by ensuring Nash equilibrium among agents from the game-theory analysis. We evaluate our method in extensive simulations and show that it outperforms baselines with higher navigation success rates. We also analyze how parameters such as the relative maximum speed affect navigation performance. Furthermore, we have conducted physical experiments and validated the effectiveness of the trained policies in real-time flights. A success rate heatmap is introduced to elucidate how spatial geometry influences navigation outcomes. Project website: https://github.com/NTU-ICG/AMS-DRL-for-Pursuit-Evasion.
description: Accepted by IEEE Transactions on Artificial Intelligence
title: UNCOVER: The Growth of the First Massive Black Holes from JWST/NIRSpec—Spectroscopic Redshift Confirmation of an X-Ray Luminous AGN at z = 10.1
Creators: name: Cutler, Sam E.
name: Weaver, John R.
name: Whitaker, Katherine E.
Publisher: name: University of Massachusetts Amherst
Year: 2023

description: The James Webb Space Telescope is now detecting early black holes (BHs) as they transition from "seeds" to supermassive BHs. Recently, Bogdan et al. reported the detection of an X-ray luminous supermassive BH, UHZ-1, with a photometric redshift at z > 10. Such an extreme source at this very high redshift provides new insights on seeding and growth models for BHs given the short time available for formation and growth. Harnessing the exquisite sensitivity of JWST/NIRSpec, here we report the spectroscopic confirmation of UHZ-1 at z = 10.073 ± 0.002. We find that the NIRSpec/Prism spectrum is typical of recently discovered z ≈ 10 galaxies, characterized primarily by star formation features. We see no clear evidence of the powerful X-ray source in the rest-frame UV/optical spectrum, which may suggest heavy obscuration of the central BH, in line with the Compton-thick column density measured in the X-rays. We perform a stellar population fit simultaneously to the new NIRSpec spectroscopy and previously available photometry. The fit yields a stellar-mass estimate for the host galaxy that is significantly better constrained than prior photometric estimates (�⋆∼1.4−0.4+0.3×108M⊙). Given the predicted BH mass (MBH ∼ 107–108M⊙), the resulting ratio of MBH/M⋆ remains 2 to 3 orders of magnitude higher than local values, thus lending support to the heavy seeding channel for the formation of supermassive BHs within the first billion years of cosmic evolution.
Aspects of Everpresent $Λ$ (I): A Fluctuating Cosmological Constant from Spacetime Discreteness
Creators: name: Das, Santanu
name: Nasiri, Arad
name: Yazdi, Yasaman K.
Publisher: name: arXiv
Year: 2023
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: We provide a comprehensive discussion of the Everpresent $Λ$ cosmological model arising from fundamental principles in causal set theory and unimodular gravity. In this framework the value of the cosmological constant ($Λ$) fluctuates, in magnitude and in sign, over cosmic history. At each epoch, $Λ$ stays statistically close to the inverse square root of the spacetime volume. Since the latter is of the order of $H^2$ today, this provides a way out of the cosmological constant puzzle without fine tuning. Our discussion includes a review of what is known about the topic as well as new motivations and insights supplementing the original arguments. We also study features of a phenomenological implementation of this model, and investigate the statistics of simulations based on it. Our results show that while the observed values of $H_0$ and $Ω_Λ^0$ are not typical outcomes of the model, they can be achieved through a modest number of simulations. We also confirm some expected features of $Λ$ based on this model, such as the fact that it stays statistically close to the value of the total ambient energy density (be it matter or radiation dominated), and that it is likely to change sign roughly every Hubble timescale.
description: 28 pages, 10 figures
title: Producing Knowledge with Care : Building Mutually Caring Researcher-research Participants Relationships
Creators: name: Sander, Alena
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: Care
subject: development studies
subject: Ethik
subject: Feminismus
subject: research ethics
subject: ddc:300

description: Today’s development studies are going through a decolonial turn. At the heart of the debates surrounding the turn are discussions about the relationship between the researcher – often from the Global Norths – and her research participants – often from the Global Souths, and how this relationship may be constructed in a more reciprocal and respectful way. This paper uses the example of the author’s dissertation research with Jordanian women’s organizations in 2017 and 2018. It looks into how the feminist mutual-care-approach developed by Joan Fisher and Berenice Tronto may inform a reciprocal and respectful way of doing research and producing knowledge with and in the Souths in practice, and looks into the challenges that may arise from it.
Additional file 1: of Consequences of obstetric fistula in sub Sahara African countries, from patientsâ perspective: a systematic review of qualitative studies
Creators: name: Debrework Bashah
name: Abebaw Worku
name: Mezgebu Mengistu
Publisher: name: figshare
Year: 2018
Subjects: Medicine
Developmental Biology
Science Policy

description: Appraisal tool adopted from CASP used to assess quality of studies included in the review. (DOCX 49 kb)
Limitations on intermittent forecasting
Creators: name: Morvai, Gusztav
name: Weiss, Benjamin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Information Theory (cs.IT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Bailey showed that the general pointwise forecasting for stationary and ergodic time series has a negative solution. However, it is known that for Markov chains the problem can be solved. Morvai showed that there is a stopping time sequence $\{λ_n\}$ such that $P(X_{λ_n+1}=1|X_0,...,X_{λ_n}) $ can be estimated from samples $(X_0,...,X_{λ_n})$ such that the difference between the conditional probability and the estimate vanishes along these stoppping times for all stationary and ergodic binary time series. We will show it is not possible to estimate the above conditional probability along a stopping time sequence for all stationary and ergodic binary time series in a pointwise sense such that if the time series turns out to be a Markov chain, the predictor will predict eventually for all $n$.
Στοχαστικές επενδυτικές αποδόσεις και ο κίνδυνος εισφοράς σε προκαθορισμένα συνταξιοδοτικά σχήματα
Creators: name: Βασιλάκης, Στέφανος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Κίνδυνος εισφοράς
subject: Συνταξιοδοτικά σχήματα

description: Στην εργασία αυτή θα παρουσιάσουμε τα συνταξιοδοτικά σχήματα για τον υπολογισμό των συντάξεων και ειδικότεραθα μελετήσουμε τα συνταξιοδοτικά σχήματα προκαθορισμένων παροχών καθώς και την συμπεριφορά του κινδύνου εισφοράς. Για την ανάλυση των παραπάνω θα χρησιμοποιήσουμε στοχαστική και χρηματοοικονομική προσέγγιση. Θα κατανοήσουμε τη σχέση μεταξύ του ποσοστού εισφοράς και κεφαλαίου, το οποίο είναι πολύ σημαντικό σχετικά για τον περιορισμότου κινδύνου εισφοράς. Το μοντέλο μας θα εφαρμοστεί σε τρεις περιπτώσεις και θα παρατηρηθεί η διακύμανση των εισφορών. Με βάση αυτό θα παρουσιαστεί η επιλογή των κατάλληλων πλεονασμάτων και ελλείψεων για την ελαχιστοποίηση του κινδύνου εισφοράς. Τέλος θα παρουσιαστούν εφαρμογές και θα δοθούν χρήσιμα συμπεράσματα.
Discrete logarithmic Sobolev inequalities in Banach spaces
Creators: name: Cordero-Erausquin, Dario
name: Eskenazis, Alexandros
Publisher: name: arXiv
Year: 2023
Subjects: subject: Functional Analysis (math.FA)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: Let $\mathscr{C}_n=\{-1,1\}^n$ be the discrete hypercube equipped with the uniform probability measure $σ_n$. We prove that if $(E,\|\cdot\|_E)$ is a Banach space of finite cotype and $p\in[1,\infty)$, then every function $f:\mathscr{C}_n\to E$ satisfies the dimension-free vector-valued $L_p$ logarithmic Sobolev inequality $$\|f-\mathbb{E} f\|_{L_p(\log L)^{p/2}(E)} \leq \mathsf{K}_p(E) \left( \int_{\mathscr{C}_n} \Big\| \sum_{i=1}^n δ_i \partial_i f\Big\|_{L_p(E)}^p \, dσ_n(δ)\right)^{1/p}.$$ The finite cotype assumption is necessary for the conclusion to hold. This estimate is the hypercube counterpart of a result of Ledoux (1988) in Gauss space and the optimal vector-valued version of a deep inequality of Talagrand (1994). As an application, we use such vector-valued $L_p$ logarithmic Sobolev inequalities to derive new lower bounds for the bi-Lipschitz distortion of nonlinear quotients of the Hamming cube into Banach spaces with prescribed Rademacher type.
Graphene Cantilever Under Casimir Force
Creators: name: Derras-Chouk, Amel
name: Chudnovsky, Eugene
name: Garanin, Dmitry
name: Jaafar, Reem
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Stability of graphene cantilever under Casimir attraction to an underlying conductor is investigated. The dependence of the instability threshold on temperature and flexural rigidity is obtained. Analytical work is supplemented by numerical computation of the critical temperature above which the graphene cantilever irreversibly bends down and attaches to the conductor. The geometry of the attachment and exfoliation of the graphene sheet is discussed. It is argued that graphene cantilever can be an excellent tool for precision measurements of the Casimir force.
MarineGEO Seagrass Habitat Monitoring Protocol
Creators: name: Lefcheck, Jonathan
name: Tennenbaum Marine Observatories Network
name: MarineGEO
Publisher: name: Smithsonian Environmental Research Center
Year: 2022
Subjects: classificationCode: 310305
subject: Marine and estuarine ecology (incl. marine ichthyology)
classificationCode: 410402
subject: Environmental assessment and monitoring

description: In this document, we provide MarineGEO’s standard survey design for sampling seagrass habitats, including key measurements of the plants, associated fauna, and other properties of the ecosystem.  Additionally, we provide define best practices for site selection, layout, and workflow.
The overall design and replication adheres as closely as possible to other seagrass monitoring programs, such as SeagrassNET and Seagrass Watch. Our goal is to provide a standardized sampling design and measurements of the key aspects of seagrass habitats that can be compared globally. We thank Fred Short and Bob Orth for thoughtful feedback on the initial draft of these protocols and Valerie Paul and Rachel Collin for leading major revisions.
This protocol provides data on above- and belowground seagrass biomass, composition, and shoot density from a standard core. Additional copies of this protocol, field datasheets, and data entry templates can be found at https://doi.org/10.25573/serc.14925114
Required protocols for MarineGEO partners: 

 Sampling Event & Environmental Monitoring (temperature, salinity, turbidity) - https://doi.org/10.25573/serc.14555511
 Seagrass density (cover, composition, shoot density)
 Seagrass shoots (leaf length, width, epiphytes)
 Predation (bait loss; ‘Squidpops’) - https://doi.org/10.25573/serc.14717802

Recommended protocols: 

 Beach seines (https://doi.org/10.25573/serc.14925105), Trawl, or Visual Diver Survey (https://doi. org/10.25573/serc.14717796) - fish and mobile invertebrate abundance, length, composition
 Sediment organic matter (bulk density, organic carbon) - https://doi.org/10.25573/serc.14925111
 Seagrass biomass (biomass, shoot density)
 Seagrass epifauna (composition, biomass)
 Seagrass macroalgae (biomass)
Wave breaking and particle jets in intense inhomogeneous charged beams
Creators: name: Rizzato, Felipe B.
name: Pakter, Renato
name: Levin, Yan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This work analyzes the dynamics of inhomogeneous, magnetically focused high-intensity beams of charged particles. While for homogeneous beams the whole system oscillates with a single frequency, any inhomogeneity leads to propagating transverse density waves which eventually result in a singular density build up, causing wave breaking and jet formation. The theory presented in this paper allows to analytically calculate the time at which the wave breaking takes place. It also gives a good estimate of the time necessary for the beam to relax into the final stationary state consisting of a cold core surrounded by a halo of highly energetic particles.
description: Accepted in Physics of Plasma Letters
MOESM1 of Evaluation of accuracy of synthetic waveforms for subduction-zone earthquakes by using a landâ ocean unified 3D structure model
Creators: name: Okamoto, Taro
name: Takenaka, Hiroshi
name: Nakamura, Takeshi
Publisher: name: figshare
Year: 2018
Subjects: subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Additional file 1: Table S1. FDM parameters. Table S2. Estimated FAMT source parameters. Table S3. Estimated best double couples based on FAMT solutions. Figure S1. Residuals versus origin-time correction. Figure S2. Horizontal source locations estimated by the FAMT and other analyses. Figure S3. Comparisons of the observed and synthetic velocity waveforms for EV2003. Figure S4. Comparisons of the observed and synthetic velocity waveforms for EV2007. Figure S5. Comparisons of the first body wave part of the observed and synthetic velocity waveforms for EV2003. Figure S6. Comparisons of the first body wave part of the observed and synthetic velocity waveforms for EV2007.
On classifying processes
Creators: name: Morvai, Gusztav
name: Weiss, Benjamin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Information Theory (cs.IT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We prove several results concerning classifications, based on successive observations $(X_1,..., X_n)$ of an unknown stationary and ergodic process, for membership in a given class of processes, such as the class of all finite order Markov chains.
Inducing Quantum Phase Transitions in Non-Topological Insulators Via Atomic Control of Sub-Structural Elements
Creators: name: Reid, Thomas K.
name: Alpay, S. Pamir
name: Balatsky, Alexander V.
name: Nayak, Sanjeev K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological insulators (TIs) are an important family of quantum materials that exhibit a Dirac point (DP) in the surface band structure but have a finite band gap in bulk. A large degree of spin-orbit interaction and low bandgap is a prerequisite for stabilizing DPs on selective atomically flat cleavage planes. Tuning of the DP in these materials has been suggested via modifications to the atomic structure of the entire system. Using the example of As$_2$Te$_3$ and ZnTe$_5$, which are not TIs, we show that a quantum phase transition can be induced in atomically flat and stepped surfaces, for As$_2$Te$_3$ and ZrTe$_5$, respectively. This is achieved by establishing a framework for controlling electronic properties that is focused on local perturbations at key locations that we call sub-structural elements (SSEs). We exemplify this framework through a novel method of isovalent sublayer anion doping and biaxial strain.
description: 13 pages, 3 figures, 1 table
title: ADCO, Cartulaire de Cîteaux pour les possessions de Saulon-la-Chapelle et Saulon-la-Rue, Fénay, Noiron et la rivière Cent-fonds (XVe siècle), Cart. 179 (11 H 1075), 70 folios, f. 0065
Creators: name: de la Côte d'Or, Archives départementales
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2015
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Cartulaire de Cîteaux pour les possessions de Saulon-la-Chapelle et Saulon-la-Rue, Fénay, Noiron et la rivière Cent-fonds (XVe siècle), Archives départementales de la Côte-d'Or, Cart. 179 (11 H 1075), 70 folios, f. 0065, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de Cîteaux pour les possessions de Saulon-la-Chapelle et Saulon-la-Rue, Fénay, Noiron et la rivière Cent-fonds (XVe siècle), Archives départementales de la Côte-d'Or, Cart. 179 (11 H 1075), 70 folios, f. 0065, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
Capillary stress and structural relaxation in moist granular materials
Creators: name: Zhou, Tingtao
name: Ioannidou, Katerina
name: Masoero, Enrico
name: Mirzadeh, Mohammad
name: Pellenq, Roland J. -M.
name: Bazant, Martin Z.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We propose a theoretical framework to calculate capillary stresses in complex mesoporous materials, such as moist sand, nanoporous hydrates, and drying colloidal films. Molecular simulations are mapped onto a phase-field model of the liquid-vapor mixture, whose inhomogeneous stress tensor is integrated over Voronoi polyhedra in order to calculate equal and opposite forces between each pair of neighboring grains. The method is illustrated by simulations of moisture-induced forces in small clusters and random packings of spherical grains using lattice-gas Density Functional Theory. For a nano-granular model of cement hydrates, this approach reproduces the hysteretic water sorption/desorption isotherms and predicts drying shrinkage strain isotherm in good agreement with experiments. We show that capillary stress is an effective mechanism for internal stress relaxation in colloidal random packings, which contributes to the extraordinary durability of cement paste.
description: 4 figures
Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains
Creators: name: Hyart, Timo
name: Alekseev, Kirill N.
name: Thuneberg, Erkki V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study theoretically the feasibility of amplification and generation of terahertz radiation in dc-ac-driven semiconductor superlattices in the absence of electric domains. We find that if in addition to dc bias a strong THz pump field is applied, Bloch gain profile for a small THz signal can be achieved under conditions of positive static differential conductivity. Here the positive differential conductivity arises, similarly to the case of large-signal amplification scheme [H. Kroemer, cond-mat/0009311)], due to modifications of dc current density caused by the application of high-frequency ac field [K. Unterrainer \textit{et al.}, Phys. Rev. Lett. \textbf{76}, 2973 (1996)]. Whereas the sign of absorption at low and zero frequencies is sensitive to the ac fields, the gain profile in the vicinity of gain maximum is robust. We suggest to use this ac-induced effect in a starter for THz Bloch oscillator. Our analysis demonstrates that the application of a short THz pulse to a superlattice allows to suppress the undesirable formation of electric domains and reach a sustained large-amplitude operation of the dc-biased Bloch scillator.
description: 13 pages, 12 figures
title: Αέναον
title: Aenaon
titleType: AlternativeTitle
Creators: name: Μητρούσης, Παναγιώτης
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Comic
Graphic novel

description: ΑΕΝΑΟΝ - AENAON ΚΟΜΙΚ Το ταξίδι ενός γέρου ξεκινάει μόλις ανοίξει ένα βιβλίο. Αυτός μαζί με τη βοήθεια αντρών θα ταξιδέψουν στην άγρια δύση με άγνωστο προορισμό για τις ανάγκες του γέρου. Ένα graphic novel με έμφαση στα τοπία και το ταξίδι και την πορεία των αντρών προς το άγνωστο.
A hybrid quantum algorithm to detect conical intersections
Creators: name: Koridon, Emiel
name: Fraxanet, Joana
name: Dauphin, Alexandre
name: Visscher, Lucas
name: O'Brien, Thomas E.
name: Polla, Stefano
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Conical intersections are topologically protected crossings between the potential energy surfaces of a molecular Hamiltonian, known to play an important role in chemical processes such as photoisomerization and non-radiative relaxation. They are characterized by a non-zero Berry phase, which is a topological invariant defined on a closed path in atomic coordinate space, taking the value $π$ when the path encircles the intersection manifold. In this work, we show that for real molecular Hamiltonians, the Berry phase can be obtained by tracing a local optimum of a variational ansatz along the chosen path and estimating the overlap between the initial and final state with a control-free Hadamard test. Moreover, by discretizing the path into $N$ points, we can use $N$ single Newton-Raphson steps to update our state non-variationally. Finally, since the Berry phase can only take two discrete values (0 or $π$), our procedure succeeds even for a cumulative error bounded by a constant; this allows us to bound the total sampling cost and to readily verify the success of the procedure. We demonstrate numerically the application of our algorithm on small toy models of the formaldimine molecule (\ce{H2C=NH}).
description: 20 + 7 pages, 4 figures
MOESM2 of The efficacy of high-dose penicillin G for pneumococcal pneumonia diagnosed based on initial comprehensive assessment at admission: an observational study
Creators: name: Komagamine, Junpei
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 2: Text S1. Definition of terms and outcomes used in this study. Text S2. Four cases in which penicillin G was replaced by other antibiotics because of treatment failure for pneumonia.
Timing the Nearby Isolated Neutron Star RX J1856.5-3754
Creators: name: van Kerkwijk, M. H.
name: Kaplan, D. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: RX J1856.5-3754 is the X-ray brightest among the nearby isolated neutron stars. Its X-ray spectrum is thermal, and is reproduced remarkably well by a black-body, but its interpretation has remained puzzling. One reason is that the source did not exhibit pulsations, and hence a magnetic field strength--vital input to atmosphere models--could not be estimated. Recently, however, very weak pulsations were discovered. Here, we analyze these in detail, using all available data from the XMM-Newton and Chandra X-ray observatories. From frequency measurements, we set a 2-sigma upper limit to the frequency derivative of \dotν<1.3e-14 Hz/s. Trying possible phase-connected timing solutions, we find that one solution is far more likely than the others, and we infer a most probable value of \dotν=(-5.98+/-0.14)e-16 Hz/s. The inferred magnetic field strength is 1.5e13 G, comparable to what was found for similar neutron stars. From models, the field seems too strong to be consistent with the absence of spectral features for non-condensed atmospheres. It is sufficiently strong, however, that the surface could be condensed, but only if it is consists of heavy elements like iron. Our measurements imply a characteristic age of about 4 Myr. This is longer than the cooling and kinematic ages, as was found for similar objects, but at almost a factor ten, the discrepancy is more extreme. A puzzle raised by our measurement is that the implied rotational energy loss rate of about 3e30 erg/s is orders of magnitude smaller than what was inferred from the H-alpha nebula surrounding the source.
description: 4 pages, 2 figures, 2 tables; accepted for publication in Astrophysical Journal (Letters)
Gravitational scattering of a quantum particle and the privileged coordinate system
Creators: name: Nikishov, A. I.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In gravitational scattering the quantum particle probes the Fourier-transforms of a metric. I evaluate the Fourier-transforms of Schwarzschild metrics in standard, harmonic and other coordinate systems in linear and $G^2-$approximations. In general different coordinate systems lead to different scattering. This opens up the possibility to choose the privileged coordinate system which should lead to scattering in agreement with experiment.
Symmetry Breaking Study with Random Matrix Ensembles
Creators: name: Hussein, M. S.
name: de Carvalho, J. X.
name: Pato, M. P.
name: Sargeant, A. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: A random matrix model to describe the coupling of $m$-fold symmetry is constructed. The particular threefold case is used to analyze data on eigenfrequencies of elastomechanical vibration of an anisotropic quartz block. It is suggested that such experimental/theoretical study may supply a powerful means to discern intrinsic symmetry of physical systems.
description: 12 pages, 3 figures Contribution to the International Workshop on Nuclei and Mesoscopic Physics (WNM07), 20-22 October, Michigan Sate University, East Lansing, Michigan. To appear in a AIP Proceeding (Pawel Danielewicz, Editor)
MOESM3 of The impact of silicon on cell wall composition and enzymatic saccharification of Brachypodium distachyon
Creators: name: Głazowska, Sylwia
name: Baldwin, Laetitia
name: Mravec, Jozef
name: Bukh, Christian
name: Hansen, Thomas
name: Jensen, Mads
name: Jonatan Fangel
name: Willats, William
name: Glasius, Marianne
name: Felby, Claus
name: Schjoerring, Jan
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Plant Biology

description: Additional file 3: Table S2. Boron distribution among organs and their cell walls in wild type and mutant plant harvested at the ripening stage. Data show the average B content in organs of dry wild type and mutant plants and the proportion of this B present in cell walls (CW). Boron concentrations were measured by inductively coupled plasma optical emission spectrometry (ICP-OES) (n = 3). The standard deviation of means used in the calculations did not exceed 20% of the mean value.
Ample bodies and Terracini loci of projective varieties
Creators: name: Laface, Antonio
name: Massarenti, Alex
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We introduce the notion of ample body of a projective variety and use it to prove emptiness results for Terracini loci and specific identifiability results for toric and homogeneous varieties.
description: 11 pages
L'accessibilité des E-services aux personnes non-voyantes : difficultés d'usage et recommandations
Creators: name: Sandoz-Guermond, Françoise
name: Bobiller-Chaumon, Marc-Eric
Publisher: name: arXiv
Year: 2007
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: While taking into account handicapped people in the design of technologies represents a social and political stake that becomes important (in particular with the recent law on equal rights for all the citizens, March 2004), this paper aims at evaluating the level of accessibility of two sites of E-services thanks to tests of use and proposing a set of recommendations in order to increase usability for the largest amount of people.
description: 4 pages