cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Jacobi - type identities in algebras and superalgebras
Creators: name: Lavrov, P. M.
name: Radchenko, O. V.
name: Tyutin, I. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce two remarkable identities written in terms of single commutators and anticommutators for any three elements of arbitrary associative algebra. One is a consequence of other (fundamental identity). From the fundamental identity, we derive a set of four identities (one of which is the Jacobi identity) represented in terms of double commutators and anticommutators. We establish that two of the four identities are independent and show that if the fundamental identity holds for an algebra, then the multiplication operation in that algebra is associative. We find a generalization of the obtained results to the super case and give a generalization of the fundamental identity in the case of arbitrary elements. For nondegenerate even symplectic (super)manifolds, we discuss analogues of the fundamental identity.
description: 1+11 pages, no figures, title changed, published version
Demandt, Alexander: Geschichte der Spätantike. Das römische Reich von Diocletian bis Justinian
Creators: name: Eckardt, Daniel
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Demandt, Alexander: Geschichte der Spätantike. Das römische Reich von Diocletian bis Justinian. München: C.H. Beck 1998. 515 S. 69,00 DM (ISBN 3-406-44107-6).
description: Forum Classicum, Nr. 2 (1999): Forum Classicum
Evidence from MESSENGER for sulfur‐ and carbon‐driven explosive volcanism on Mercury
Creators: name: Weider, Shoshana Z.
name: Nittler, Larry R.
name: Murchie, Scott L.
name: Peplowski, Patrick N.
name: McCoy, Timothy J.
name: Kerber, Laura
name: Klimczak, Christian
name: Ernst, Carolyn M.
name: Goudge, Timothy A.
name: Starr, Richard D.
name: Izenberg, Noam R.
name: Klima, Rachel L.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Planetary science
subject: Planets--Geology
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Volcanism

description: Targeted MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) X‐Ray Spectrometer measurements of Mercury's largest identified pyroclastic deposit are combined with neutron and reflectance spectroscopy data to constrain the composition of volatiles involved in the eruption that emplaced the pyroclastic material. The deposit, northeast of the Rachmaninoff basin, is depleted in S (relative to Ca and Si) and C, compared with the rest of Mercury's surface. Spectral reflectance measurements of the deposit indicate relatively high overall reflectance and an oxygen‐metal charge transfer (OMCT) absorption band at ultraviolet wavelengths. These results are consistent with oxidation of graphite and sulfides during magma ascent, via reaction with oxides in the magma or assimilated country rock, and the formation of S‐ and C‐bearing volatile species. Consumption of graphite during oxidation could account for the elevated reflectance of the pyroclastic material, and the strength of the OMCT band is consistent with ~0.03–0.1 wt % FeO in the deposit.
MESSENGER observations of induced magnetic fields in Mercury's core
Creators: name: Johnson, Catherine L.
name: Philpott, Lydia C.
name: Anderson, Brian J.
name: Korth, Haje
name: Hauck II, Steven A.
name: Heyner, Daniel
name: Phillips, Roger J.
name: Winslow, Reka M.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2016
Subjects: Planetary science
Planets--Core
Magnetic induction

description: Orbital data from the Magnetometer on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft allow investigation of magnetic fields induced at the top of Mercury's core by time‐varying magnetospheric fields. We used 15 Mercury years of observations of the magnetopause position as well as the magnetic field inside the magnetosphere to establish the presence and magnitude of an annual induction signal. Our results indicate an annual change in the internal axial dipole term, g10, of 7.5 to 9.5 nT. For negligible mantle conductivity, the average annual induction signal provides an estimate of Mercury's core radius to within ±90 km, independent of geodetic results. Larger induction signals during extreme events are expected but are challenging to identify because of reconnection‐driven erosion. Our results indicate that the magnetopause reaches the dayside planetary surface 1.5–4% of the time.
title: COVID-19 and Implications for Automation
Creators: name: Chernoff, Alex
name: Warman, Casey
Publisher: name: Bank of Canada
Year: 2021

description: Occupations held by females with mid-level education face the highest risk of accelerated automation as a result of the COVID-19 pandemic.

description: Les professions exercées par des femmes au niveau d’éducation moyen sont les plus menacées par l’intensification des efforts d’automatisation due à la pandémie de COVID-19.
Latein für die Schule und zu Hause: 1. Lernjahr
Creators: name: Bode, Reinhard
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: disco: Latein für die Schule und zu Hause: 1. Lernjahr. - Berlin (Cornelsen Verlag) 1999.- ISBN 3-464-91311-2.- Preis 149,-DM, Schullizenz erhältlich. Systemvoraussetzungen: Pentium-PC, 16 MB Arbeitsspeicher, Quadspeed-CD-ROM-Lauf- werk, Grafikauflösung 640 x 480 (SVGA), Soundblaster- oder kompatible Soundkarte, Windows 95, Mikrophon empfohlen.
description: Forum Classicum, Nr. 2 (1999): Forum Classicum
Semi-supervised Domain Adaptive Structure Learning
Creators: name: Qin, Can
name: Wang, Lichen
name: Ma, Qianqian
name: Yin, Yu
name: Wang, Huan
name: Fu, Yun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Semi-supervised domain adaptation (SSDA) is quite a challenging problem requiring methods to overcome both 1) overfitting towards poorly annotated data and 2) distribution shift across domains. Unfortunately, a simple combination of domain adaptation (DA) and semi-supervised learning (SSL) methods often fail to address such two objects because of training data bias towards labeled samples. In this paper, we introduce an adaptive structure learning method to regularize the cooperation of SSL and DA. Inspired by the multi-views learning, our proposed framework is composed of a shared feature encoder network and two classifier networks, trained for contradictory purposes. Among them, one of the classifiers is applied to group target features to improve intra-class density, enlarging the gap of categorical clusters for robust representation learning. Meanwhile, the other classifier, serviced as a regularizer, attempts to scatter the source features to enhance the smoothness of the decision boundary. The iterations of target clustering and source expansion make the target features being well-enclosed inside the dilated boundary of the corresponding source points. For the joint address of cross-domain features alignment and partially labeled data learning, we apply the maximum mean discrepancy (MMD) distance minimization and self-training (ST) to project the contradictory structures into a shared view to make the reliable final decision. The experimental results over the standard SSDA benchmarks, including DomainNet and Office-home, demonstrate both the accuracy and robustness of our method over the state-of-the-art approaches.
title: Ανενεργά λατομεία: η ελληνική και διεθνής εμπειρία πρακτικών για τη συρραφή του δικτύου κενών του αστικού και περιαστικού ιστού
Creators: name: Παπουτσα Αικατερινη
name: Καλλιμασιωτη Σοφια
Publisher: name: Technical University of Crete
Year: 2019

description:    Οι κοινωνικοπολιτικές και οικονομικές ζυμώσεις των περασμένων αιώνων, επέφεραν εντατικούς μετασχηματισμούς στην πόλη. Απόρροια του φαινομένου, αποτέλεσε μεταξύ άλλων, η δημιουργία δικτύου που αποτελείται από  τα αστικά και εδαφικά κενά. Τέτοιοι χώροι εντοπίζονται τόσο στο εσωτερικό, όσο και στα όρια της πόλης. Οι ασαφείς και ασχεδίαστοι αδόμητοι χώροι, παράδειγμα των οποίων αποτελούν τα ανενεργά λατομεία, αντιμετωπίζονται ως ασυνέχειες του πολεοδομικού ιστού και ενώ προκαλούν αμηχανία, αποτελούν πρόσφορους τόπους για τοπιακή, πολιτιστική και αστική διαμόρφωση.

   Στην παρούσα εργασία αρχικά μελετάται, μέσω ιστορικής αναδρομής, η δημιουργία των κενών και η συμβολή τους σε αντιληπτικό και χωρικό επίπεδο και διερευνώνται οι προοπτικές ανάπλασης και επανένταξης τους σε ένα ενοποιημένο αστικό τόπο. Η έρευνα εστιάζει στην αξιοποίηση και αποκατάσταση εγκαταλελειμμένων ανενεργών λατομείων. Μέσω της ερευνητικής διαδικασίας, μελετώνται χαρακτηριστικά παραδείγματα αποκατάστασης ανενεργών λατομείων, από τον ελλαδικό και το διεθνή χώρο. Σε τελικό στάδιο, επιχειρείται η αξιολόγηση των αναπλάσεων και η προσπάθεια καθορισμού των βέλτιστων πρακτικών.
Statistically equivalent surrogate material models and the impact of random imperfections on elasto-plastic response
Creators: name: Khristenko, Ustim
name: Constantinescu, Andrei
name: Tallec, Patrick Le
name: Wohlmuth, Barbara
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: 74P15, 62M40, 90C15

description: Manufactured materials usually contain random imperfections due to the fabrication process, e.g., the 3D-printing, casting, etc. These imperfections affect significantly the effective material properties and result in uncertainties in the mechanical response. Numerical analysis of the effects of the imperfections and the uncertainty quantification (UQ) can be often done by use of digital stochastic surrogate material models. In this work, we present a new flexible class of surrogate models depending on a small number of parameters with special focus on two-phase materials. The surrogate models are constructed as the level-set of a linear combination of an intensity field representing the topological shape and a Gaussian perturbation representing the imperfections. The mathematical design parameters of the model are related to physical ones and thus easy to interpret. The calibration of the model parameters is performed using progressive batching sub-sampled quasi-Newton minimization, using a designed distance measure between the synthetic samples and the data. Then, employing a fast sampling algorithm, an arbitrary number of synthetic samples can be generated to use in Monte Carlo type methods. In particular, we illustrate the method in application to UQ of the elasto-plastic response of an imperfect octet-truss lattice which plays an important role in additive manufacturing. To this end, we study the effective material properties of the lattice unit cell under elasto-plastic deformations and investigate the sensitivity of the effective Young's modulus to the imperfections.
description: 21 pages, 15 figures
title: Γραφικότητα: ο τύπος, οι όψεις, τα δάπεδα. Η περίπτωση του Πόρτο
title: Picturesque: typology, facades, floors. The case of Porto
Creators: name: Σκουλα Αννα
Publisher: name: Technical University of Crete
Year: 2019

description: Με αφορμή την πρόσφατη διαμονή και τα ταξίδια στη χώρα της Πορτογαλίας δημιουργήθηκε η ανάγκη για μελέτη της αρχιτεκτονικής της σε βάθος, καθώς τόσο ο αστικός χώρος, όσο και η ύπαιθρός της παρουσιάζουν ιδιαίτερο ενδιαφέρον. Οι γραφικές αξίες που συναντά κανείς στους παραδοσιακούς οικισμούς της ενδοχώρας και στα ιστορικά κέντρα των μεγαλουπόλεών της είναι κοινές με αυτές που εντοπίζονται στον μεσογειακό χώρο, αλλά φέρουν πάντα τη σφραγίδα της πορτογαλικής κουλτούρας. Το μυστικό που προσπαθεί να ξεκλειδωθεί στην παρούσα έρευνα αφορά στα αρχιτεκτονικά γνωρίσματα που κρύβουν τις γραφικές αυτές αξίες και στον εντοπισμό τους σε οικιστικά σύνολα της Μεσογείου και πιο συγκεκριμένα στο ιστορικό κέντρο της πόλης του Πόρτο.
description: This thesis is a result of the recent stay and trips all around the land of Portugal, which created the need to study and research about Portuguese architecture
deeply, as both the urban space and the inland of the country are very interesting. The picturesque values that can be found in the traditional settlements of the inland and the historic city centres are the same with
those that can be found in the Mediterranean area, but they always have the imprinting of the Portuguese culture. The aim of this thesis is to disclose the secret related to the architectural characteristics that contain those picturesque values and to their recognition in the traditional settlements of the Mediterranean area and more specifically in the historic city centre of Porto.
Identification of buried lunar impact craters from GRAIL data and implications for the nearside maria
Creators: name: Evans, Alexander J.
name: Soderblom, Jason M.
name: Andrews-Hanna, Jeffrey C.
name: Solomon, Sean C.
name: Zuber, Maria T.
Publisher: name: Columbia University
Year: 2016
Subjects: Moon
Lunar geology
Impact craters
Planetary science

description: Gravity observations from the dual Gravity Recovery and Interior Laboratory (GRAIL) spacecraft have revealed more than 100 quasi‐circular mass anomalies, 26–300 km in diameter, on the lunar nearside. These anomalies are interpreted to be impact craters filled primarily by mare deposits, and their characteristics are consistent with those of impact structures that formed prior to, and during, intervals of flooding of feldspathic terrane by mare basalt lavas. We determine that mare deposits have an average density contrast of 850⁺³⁰⁰₋₂₀₀ kg m⁻³ relative to the surrounding crust. The presence of a large population of volcanically buried craters with minimal topographic expression and diameters up to 300 km requires an average nearside mare thickness of at least 1.5 km and local lenses of mare basalt as thick as ~7 km.
A Supersymmetric Theory of Vector-like Leptons
Creators: name: Joglekar, Aniket
name: Schwaller, Pedro
name: Wagner, Carlos E. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a supersymmetric extension of the vector-like lepton scenario, such that the vacuum instability induced by large lepton Yukawa couplings is lifted by the presence of superpartners at or below the TeV scale. In order to preserve the unification of gauge couplings, we introduce a full 16+\bar{16} of SO(10), and determine the maximal possible values for the Yukawa couplings consistent with perturbativity at the GUT scale. We find that the Higgs to diphoton decay rate can be enhanced by up to 50% while maintaining vacuum stability and keeping the new particle masses above 100 GeV, while larger enhancements are possible if the masses of the new particles are lowered further.
description: 25 pages, 9 figures; v2: added references and discussion of CMS diphoton result; v3: minor improvements, JHEP version
title: Βιώνοντας την οινοπαραγωγική διαδικασία στο Πόρτο: Ανασυγκρότηση πρώην βιομηχανικού χώρου και της ευρύτερης οικιστικής περιοχής στη συνοικία Bonfim
title: Experience the production of wine in Porto: Recovery of an ex industrial space and its surrounding residential area in Bonfim district
Creators: name: Σκουλα Αννα
Publisher: name: Technical University of Crete
Year: 2019

description: Η παρούσα διπλωματική εργασία, μας μεταφέρει στον πορτογαλικό χώρο και πιο συγκεκριμένα στη συνοικία Bonfim, που βρίσκεται κοντά στο ιστορικό κέντρο της πόλης του Πόρτο. Η περιοχή μελέτης αφορά σε δυο κτίρια ενός πρώην βυρσοδεψείου της συνοικίας, που σήμερα δεν έχουν κάποια χρήση, καθώς και στην περιοχή  γύρω  από αυτά, στην οποία συνυπάρχουν σήμερα δυο είδη κατοίκησης, με ένα κενό χώρο ανάμεσά τους. Το ένα αφορά στο είδος κατοικιών που αναπτύχθηκαν γύρω από τη δραστηριότητα του βυρσοδεψείου (ilhas), που μετά την αδρανοποίηση της λειτουργίας του, δημιούργησαν σταδιακά μια εικόνα εγκατάλειψης και παρακμής και το άλλο αφορά σε μια ζώνη πολυκατοικιών, που κατασκευάστηκαν πολύ αργότερα και έχουν πιο σύγχρονο χαρακτήρα.
Η πρόταση της μελέτης έχει ως άξονες: την επανάχρηση και αποκατάσταση των δυο κτιρίων του βυρσοδεψείου και τον επανασχεδιασμό των κατοικιών γύρω από αυτά, τη δημιουργία νέων κτιριακών όγκων, που ενισχύουν τις υπάρχουσες δομές και τέλος, τη δημιουργία δημοσίων χώρων, που σκοπό έχουν την αξιοποίηση του κενού χώρου και την αποκατάσταση της παρακμιακής εικόνας της περιοχής. Στο πλαίσιο αυτό και λαμβάνοντας υπόψη, την πορτογαλική παράδοση γύρω από την παραγωγή του κρασιού Porto, αποφασίζεται να δημιουργηθεί ένας χώρος με επίκεντρο τον οίνο, ο οποίος όντας επισκέψιμος, θα δίνει τη δυνατότητα στον επισκέπτη να βιώσει όλα τα στάδια παραγωγής του κρασιού και ταυτόχρονα θα αναβαθμίσει την περιοχή.
Έτσι, το κύριο κτίριο του βυρσοδεψείου μετατρέπεται σε ένα επισκέψιμο οινοποιείο και μουσείο οίνου ταυτόχρονα, αποκτώντας ξανά το βιομηχανικό του χαρακτήρα, ενώ το άλλο κτίριο μετατρέπεται σε έναν χώρο συμπληρωματικό, στον οποίο λαμβάνουν χώρα εκδηλώσεις και ταυτόχρονα στεγάζει το εστιατόριο του συγκροτήματος. Επιπλέον, δημιουργούνται τα εξής νέα κτίρια: αποθήκη οινοποιείου, οινολογική σχολή, φοιτητική εστία και παρατηρητήριο, που σε συνδυασμό με τη δημιουργία δημοσίων χώρων, στόχο έχουν την ενίσχυση των παραπάνω δράσεων. Τέλος, νέα κτίρια κατοικιών δημιουργούνται στη ζώνη των υπαρχουσών πολυκατοικιών, τα οποία φέρουν στοιχεία της πορτογαλικής αρχιτεκτονικής, μέσα όμως από το πρίσμα μιας πιο σύγχρονης ματιάς.
Communication over Finite-Chain-Ring Matrix Channels
Creators: name: Feng, Chen
name: Nóbrega, Roberto W.
name: Kschischang, Frank R.
name: Silva, Danilo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Though network coding is traditionally performed over finite fields, recent work on nested-lattice-based network coding suggests that, by allowing network coding over certain finite rings, more efficient physical-layer network coding schemes can be constructed. This paper considers the problem of communication over a finite-ring matrix channel $Y = AX + BE$, where $X$ is the channel input, $Y$ is the channel output, $E$ is random error, and $A$ and $B$ are random transfer matrices. Tight capacity results are obtained and simple polynomial-complexity capacity-achieving coding schemes are provided under the assumption that $A$ is uniform over all full-rank matrices and $BE$ is uniform over all rank-$t$ matrices, extending the work of Silva, Kschischang and Kötter (2010), who handled the case of finite fields. This extension is based on several new results, which may be of independent interest, that generalize concepts and methods from matrices over finite fields to matrices over finite chain rings.
description: Submitted to IEEE Transactions on Information Theory, April 2013. Revised version submitted in Feb. 2014. Final version submitted in June 2014
5Greplay: a 5G Network Traffic Fuzzer -- Application to Attack Injection
Creators: name: Salazar, Zujany
name: Nguyen, Huu Nghia
name: Mallouli, Wissam
name: Cavalli, Ana R
name: de Oca, Edgardo Montes
Publisher: name: arXiv
Year: 2023
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The fifth generation of mobile broadband is more than just an evolution to provide more mobile bandwidth, massive machine-type communications, and ultra-reliable and low-latency communications. It relies on a complex, dynamic and heterogeneous environment that implies addressing numerous testing and security challenges. In this paper we present 5Greplay, an open-source 5G network traffic fuzzer that enables the evaluation of 5G components by replaying and modifying 5G network traffic by creating and injecting network scenarios into a target that can be a 5G core service (e.g., AMF, SMF) or a RAN network (e.g., gNodeB). The tool provides the ability to alter network packets online or offline in both control and data planes in a very flexible manner. The experimental evaluation conducted against open-source based 5G platforms, showed that the target services accept traffic being altered by the tool, and that it can reach up to 9.56 Gbps using only 1 processor core to replay 5G traffic.
Widespread effusive volcanism on Mercury likely ended by about 3.5 Ga
Creators: name: Byrne, Paul K.
name: Ostrach, Lillian R.
name: Fassett, Caleb I.
name: Chapman, Clark R.
name: Denevi, Brett W.
name: Evans, Alexander J.
name: Klimczak, Christian
name: Banks, Maria E.
name: Head, James W.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2016
Subjects: Planetary science
Planets--Geology
Volcanism
Impact craters

description: Crater size–frequency analyses have shown that the largest volcanic plains deposits on Mercury were emplaced around 3.7 Ga, as determined with recent model production function chronologies for impact crater formation on that planet. To test the hypothesis that all major smooth plains on Mercury were emplaced by about that time, we determined crater size–frequency distributions for the nine next‐largest deposits, which we interpret also as volcanic. Our crater density measurements are consistent with those of the largest areas of smooth plains on the planet. Model ages based on recent crater production rate estimates for Mercury imply that the main phase of plains volcanism on Mercury had ended by ~3.5 Ga, with only small‐scale volcanism enduring beyond that time. Cessation of widespread effusive volcanism is attributable to interior cooling and contraction of the innermost planet.
J-PLUS: Uncovering a large population of extreme [OIII] emitters in the local Universe
Creators: name: Lumbreras-Calle, A.
name: López-Sanjuan, C.
name: Sobral, D.
name: Fernández-Ontiveros, J. A.
name: Vílchez, J. M.
name: Hernán-Caballero, A.
name: Akhlaghi, M.
name: Díaz-García, L. A.
name: Alcaniz, J.
name: Angulo, R. E.
name: Cenarro, A. J.
name: Cristóbal-Hornillos, D.
name: Dupke, R. A.
name: Ederoclite, A.
name: Hernández-Monteagudo, C.
name: Marín-Franch, A.
name: Moles, M.
name: Sodré, L.
name: Ramió, H. Vázquez
name: Varela, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Over the past decades, several studies have discovered a population of galaxies undergoing very strong star formation events, called extreme emission line galaxies (EELGs). In this work, we exploit the capabilities of the Javalambre Photometric Local Universe Survey (J-PLUS), a wide field multifilter survey, with 2000 square degrees observed. We use it to identify EELGs at low redshift by their [OIII]5007 emission line. We intend to provide with a more complete, deep, and less biased sample of local EELGs. We select objects with an excess of flux in the J-PLUS mediumband $J0515$ filter, which covers the [OIII] line at z$<$0.06. We remove contaminants (stars and higher redshift systems) using J-PLUS and WISE infrared data, with SDSS spectra as a benchmark. We perform spectral energy distribution fitting to estimate the properties of the galaxies: line fluxes, equivalent widths (EWs), masses, etc. We identify 466 EELGs at ${\rm z} < 0.06$ with [OIII] EW over 300 \textÅ and $r$-band mag. below 20, of which 411 were previously unknown. Most show compact morphologies, low stellar masses ($\log (M_{\star}/M_{\odot}) \sim {8.13}^{+0.61}_{-0.58}$), low dust extinction ($E(B-V)\sim{0.1}^{+0.2}_{-0.1}$), and very young bursts of star formation (${3.0}^{+2.7}_{-2.0}$ Myr). Our method is up to $\sim$ 20 times more efficient detecting EELGs per Mpc$^3$ than broadband surveys, and as complete as magnitude-limited spectroscopic surveys (and reaching fainter objects). The sample is not directly biased against strong H$α$ emitters, in contrast with broadband surveys. We demonstrate the capability of J-PLUS to identify, following a clear selection process, a large sample of previously unknown EELGs showing unique properties. A fraction of them are likely similar to the first galaxies in the Universe, but at a much lower redshift, which makes them ideal targets for follow-up studies.
description: 22 pages, 22 figures. Submitted to Astronomy & Astrophysics
Dynamic Learning of Correlation Potentials for a Time-Dependent Kohn-Sham System
Creators: name: Bhat, Harish S.
name: Collins, Kevin
name: Gupta, Prachi
name: Isborn, Christine M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We develop methods to learn the correlation potential for a time-dependent Kohn-Sham (TDKS) system in one spatial dimension. We start from a low-dimensional two-electron system for which we can numerically solve the time-dependent Schrödinger equation; this yields electron densities suitable for training models of the correlation potential. We frame the learning problem as one of optimizing a least-squares objective subject to the constraint that the dynamics obey the TDKS equation. Applying adjoints, we develop efficient methods to compute gradients and thereby learn models of the correlation potential. Our results show that it is possible to learn values of the correlation potential such that the resulting electron densities match ground truth densities. We also show how to learn correlation potential functionals with memory, demonstrating one such model that yields reasonable results for trajectories outside the training set.
description: 20 pages, 5 figures
title: Επαναπροσδιορίζοντας την βιομηχανική αξία του τόπου: ανάπλαση και επανασχεδιασμός του ανενεργού λατομείου ΛΑΤΟ στα Τουρκοβούνια
title: Redefining and redesigning the industrial footprint of the old Lato quarry in Tourkovounia area
Creators: name: Παπουτσα Αικατερινη
name: Καλλιμασιωτη Σοφια
Publisher: name: Technical University of Crete
Year: 2019

description:    Η παρούσα διπλωματική εργασία επιχειρεί τη διαμόρφωση του
τοπίου στη περιοχή του εγκαταλειμμένου λατομείου ΛΑΤΟ στα
Τουρκοβούνια, τα οποία αποτελούν την υψηλότερη και πιο εκτεταμένη
λοφοσειρά του λεκανοπεδίου Αττικής. Πιο συγκεκριμένα, η προς μελέτη
περιοχή περιβάλλεται από δύο δήμους, τον Ψυχικού/Φιλοθέης στα
ανατολικά και το δήμο Γαλατσίου στα δυτικά.

   Ο σχεδιασμός ξεκινά με σημείο αναφοράς τα βιομηχανικά
κατάλοιπα της περιοχής, ως σημαντικά στοιχεία της βιομηχανικής μνήμης
και κληρονομιάς. Προτείνονται δύο βασικές σχεδιαστικές προσεγγίσεις, η
πολιτιστική και η τοπιακή, με τον λατομικό χώρο να εντάσσει τη
δημιουργία ενός μουσείου ορυκτών πόρων και τα εγκαταλειμμένα κελύφη
να αναδιαμορφώνονται και να φιλοξενούν διάφορες μορφές τέχνης.
Παράλληλα, διαμορφώνεται ένας βιομηχανικός περίπατος, ο οποίος
αποτελεί τη μετάβαση από την πολιτιστική προσέγγιση στην τοπιακή και
το αντίστροφο, οργανώνοντας τη σύνθεση του σχεδιασμού. Οι
επεμβάσεις αυτές, τοπιακής και πολιτιστικής προσέγγισης, αναδεικνύουν
τον σημαντικό χαρακτήρα της βιομηχανικής κληρονομιάς της περιοχής
και παράλληλα, αποτελούν συνδετικό κρίκο των ετερόκλητων στοιχείων
των δύο δήμων, μετατρέποντας τη περιοχή σε σημαντικό πόλο έλξης.
Red-Giant Branch Stellar Cores as Macroscopic Dark Matter Detectors
Creators: name: Dessert, Christopher
name: Johnson, Zachary
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We show that macroscopic dark matter (DM) impacts on the degenerate helium cores of red-giant branch (RGB) stars can ignite helium fusion via DM-baryon elastic scattering. The onset of helium burning leads to a characteristic drop in luminosity and rise in temperature that marks the transition to a horizontal branch star. We show that such impacts can alter the RGB luminosity function of globular clusters (GCs), focusing in particular on the GC M15. Using models of M15 stars constructed with the stellar simulation code MESA, we compute the expected DM-ignition event rates and the theoretical RGB luminosity functions under the null and signal hypotheses. We constrain DM with masses $10^{17}\ {\rm g} \lesssim m_χ \lesssim 10^{20}\ \rm{g}$ and geometric cross sections $10^2\ {\rm cm}^2 \lesssim σ_{χn} \lesssim 10^{7}\ \rm{ cm}^2 $ assuming that the DM in M15 is sourced by the background Milky Way halo. We also place more stringent constraints assuming that M15 formed in a DM subhalo that survives today.
description: 11+3 pages, 5+3 figures
Quantum Monte Carlo Calculations with Chiral Effective Field Theory Interactions
Creators: name: Gezerlis, A.
name: Tews, I.
name: Epelbaum, E.
name: Gandolfi, S.
name: Hebeler, K.
name: Nogga, A.
name: Schwenk, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the first quantum Monte Carlo (QMC) calculations with chiral effective field theory (EFT) interactions. To achieve this, we remove all sources of nonlocality, which hamper the inclusion in QMC calculations, in nuclear forces to next-to-next-to-leading order. We perform auxiliary-field diffusion Monte Carlo (AFDMC) calculations for the neutron matter energy up to saturation density based on local leading-order, next-to-leading order, and next-to-next-to-leading order nucleon-nucleon interactions. Our results exhibit a systematic order-by-order convergence in chiral EFT and provide nonperturbative benchmarks with theoretical uncertainties. For the softer interactions, perturbative calculations are in excellent agreement with the AFDMC results. This work paves the way for QMC calculations with systematic chiral EFT interactions for nuclei and nuclear matter, for testing the perturbativeness of different orders, and allows for matching to lattice QCD results by varying the pion mass.
description: 6 pages, 3 figures, 1 table
Coupled quintessence with a generalized interaction term
Creators: name: Potting, Robertus
name: Sá, Paulo M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate a cosmological model in which dark energy, represented by a quintessential scalar field, is directly coupled to a dark-matter perfect fluid. We are interested in solutions of cosmological relevance, namely those for which a dark-matter-dominated era long enough to allow for structure formation is followed by an era of accelerated expansion driven by dark energy. For the coupling between these two dark components of the Universe, we choose forms that generalize the one most commonly used in the literature. Resorting to powerful methods of qualitative analysis of dynamical systems, we show that, for certain generalized forms of the coupling, final states of our coupled quintessential model correspond to solutions in which the evolution of the Universe is completely dominated by dark energy. In this case, there are no scaling solutions. Interestingly, however, for certain values of a relevant parameter, during the approach to the final state of evolution, the cosmological parameters change so slowly that, for all practical purposes, the solution appears to be stuck in a state corresponding to a scaling solution.
description: New section included and references added, 17 pages, 12 figures
Casting Light on BSM Physics with SM Standard Candles
Creators: name: Curtin, David
name: Jaiswal, Prerit
name: Meade, Patrick
name: Tien, Pin-Ju
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Standard Model (SM) has had resounding success in describing almost every measurement performed by the ATLAS and CMS experiments. In particular, these experiments have put many beyond the SM models of natural Electroweak Symmetry Breaking into tension with the data. It is therefore remarkable that it is still the LEP experiment, and not the LHC, which often sets the gold standard for understanding the possibility of new color-neutral states at the electroweak (EW) scale. Recently, ATLAS and CMS have started to push beyond LEP in bounding heavy new EW states, but a gap between the exclusions of LEP and the LHC typically remains. In this paper we show that measurements of SM Standard Candles can be repurposed to set entirely complementary constraints on new physics. To demonstrate this, we use WW cross section measurements to set bounds on a set of slepton-based simplified models which fill in the gaps left by LEP and dedicated LHC searches. Having demonstrated the sensitivity of the WW measurement to light sleptons, we also find regions where sleptons can improve the fit of the data compared to the NLO SM WW prediction alone. Remarkably, in those regions the sleptons also provide for the right relic-density of Bino-like Dark Matter and provide an explanation for the longstanding 3 sigma discrepancy in the measurement of (g-2)_μ.
description: 22 pages, 9 figures. Fixed typos
SpaceQ -- Direct Detection of Ultralight Dark Matter with Space Quantum Sensors
Creators: name: Tsai, Yu-Dai
name: Eby, Joshua
name: Safronova, Marianna S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Recent advances in quantum sensors, including atomic clocks, enable searches for a broad range of dark matter candidates. The question of the dark matter distribution in the Solar system critically affects the reach of dark matter direct detection experiments. Partly motivated by the NASA Deep Space Atomic Clock (DSAC), we show that space quantum sensors present new opportunities for ultralight dark matter searches, especially for dark matter states bound to the Sun. We show that space quantum sensors can probe unexplored parameter space of ultralight dark matter, covering theoretical relaxion targets motivated by naturalness and Higgs mixing. If an atomic clock were able to make measurements on the interior of the solar system, it could probe this highly sensitive region directly and set very strong constraints on the existence of such a bound-state halo in our solar system. We present sensitivity projections for space-based probes of ultralight dark matter which couples to electron, photon, and gluon fields, based on current and future atomic, molecular, and nuclear clocks.
description: 13 pages, 5 figures
Square roots of Hamiltonian Diffeomorphisms
Creators: name: Albers, Peter
name: Frauenfelder, Urs
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symplectic Geometry (math.SG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In this article we prove that on any closed symplectic manifold there exists an arbitrarily $C^\infty$-small Hamiltonian diffeomorphism not admitting a square root.
description: 6 pages; minor modifications and corrections
Coherence-induced quantum forces
Creators: name: Elsayed, Tarek A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We introduce a model that explains the phenomenon of correlation-assisted tunneling and puts it in a broader context. This model assumes the existence of an effective force of pure quantum nature between nearby fragments of correlated matter that results due to interference effects. The magnitude of this force depends on the amount of coherence between different locations; it attains a maximum value for fragments in a perfect superfluid state and disappears entirely when the fragments are in the Mott Insulator state. The force can also be explained in terms of the Bohmian quantum potential. We illustrate the implications of this force on the transport of cold atoms through simple potential structures, the triple-well harmonic trap and optical lattices.
description: Minor revision; 13 pages, 4 figures
Intense energetic electron flux enhancements in Mercury's magnetosphere: An integrated view with high‐resolution observations from MESSENGER
Creators: name: Baker, Daniel N.
name: Dewey, Ryan M.
name: Lawrence, David J.
name: Goldsten, John O.
name: Peplowski, Patrick N.
name: Korth, Haje
name: Slavin, James A.
name: Krimigis, Stamatios M.
name: Anderson, Brian J.
name: Ho, George C.
name: McNutt Jr., Ralph L.
name: Raines, Jim M.
name: Schriver, David
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2016
Subjects: Planetary science
Planets--Magnetospheres
Magnetospheric substorms

description: The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission to Mercury has provided a wealth of new data about energetic particle phenomena. With observations from MESSENGER's Energetic Particle Spectrometer, as well as data arising from energetic electrons recorded by the X‐Ray Spectrometer and Gamma‐Ray and Neutron Spectrometer (GRNS) instruments, recent work greatly extends our record of the acceleration, transport, and loss of energetic electrons at Mercury. The combined data sets include measurements from a few keV up to several hundred keV in electron kinetic energy and have permitted relatively good spatial and temporal resolution for many events. We focus here on the detailed nature of energetic electron bursts measured by the GRNS system, and we place these events in the context of solar wind and magnetospheric forcing at Mercury. Our examination of data at high temporal resolution (10 ms) during the period March 2013 through October 2014 supports strongly the view that energetic electrons are accelerated in the near‐tail region of Mercury's magnetosphere and are subsequently “injected” onto closed magnetic field lines on the planetary nightside. The electrons populate the plasma sheet and drift rapidly eastward toward the dawn and prenoon sectors, at times executing multiple complete drifts around the planet to form “quasi‐trapped” populations.
title: Παλιά Πόλη Χανίων: η εξέλιξη της πολεοδομικής προστασίας και το αποτύπωμα της στον ιστορικό ιστό της Παλιάς Πόλης από τα μέσα του 20ου αιώνα μέχρι και σήμερα
title: Chania Old Town: the evolution of urban planning protection and its impact on the historical center of Chania, from the middle of 20th century untill nowadays
Creators: name: Καλαιτζαντωνακη Μαρια-Ηλιανα
name: Δρακοπουλου Αναστασια-Ραφαελα
Publisher: name: Technical University of Crete
Year: 2019

description: Η παρούσα ερευνητική εργασία επιχειρεί την μελέτη, την καταγραφή και αξιολόγηση του συνόλου των έργων που έλαβαν χώρα στην Παλιά Πόλη των Χανίων από την δεκαετία του ‘50 και μετά. Γίνεται καταγραφή και ανάλυση των επεμβάσεων, τόσο σε επίπεδο έργων υποδομής, όσο και σε επίπεδο διαχείρισης του μνημειακού αποθέματος της πόλης, με στόχο την αποτίμηση των ενεργειών που οδήγησαν στη μορφή, την δομή και την λειτουργία που έχει σήμερα. Αρχικά κρίνεται απαραίτητη η μελέτη των τρόπων διαχείρισης των ιστορικών κέντρων στον ευρωπαϊκό και ελλαδικό χώρο μέσω της καταγραφής του νομοθετικού και θεσμικού πλαισίου, με στόχο την εξεύρεση των παραγόντων που επέδρασαν καταλυτικά στην εξέλιξη των μορφών προστασίας της Παλιάς Πόλης των Χανίων. Στη συνέχεια με γνώμονα το πολιτικοοικονομικό προσκήνιο της χώρας, η εργασία εστιάζει στις μελέτες που εκπονήθηκαν και στις επιμέρους επεμβάσεις που υλοποιήθηκαν στο πέρασμα των χρόνων. Τέλος παρατίθενται συνεντεύξεις προσώπων-πρωταγωνιστών που συμμετείχαν ενεργά στην ανάδειξη και προστασία της Παλιάς Πόλης.
Ring-o-rings: a new category of supramolecular structures with topologically tunable properties
Creators: name: Tubiana, Luca
name: Ferrari, Franco
name: Orlandini, Enzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Macrochains of topologically interlocked rings with unique physical properties have recently gained considerable interest in supramolecular chemistry, biology, and soft matter. Most of the work has been, so far, focused on linear chains and on their variety of conformational properties compared to standard polymers. Here we go beyond the linear case and show that, by circularizing such macrochains, one can exploit the topology of the local interlockings to store torsional stress in the system, altering significantly its metric and local properties. Moreover, by properly defining the twist (Tw) and writhe (Wr) of these macrorings we show the validity of a relation equivalent to the Cǎlugǎreanu-White-Fuller theorem $Tw + Wr$=const, originally proved for ribbon like structures such as ds-DNA. Our results suggest that circular structures of topologically linked rings with storable and tunable torsion can form a new category of highly designable multiscale structures with potential applications in supramolecular chemistry and material science
description: 10 pages, 8 figures
Rainer Nickel, Lexikon der antiken Literatur
Creators: name: Werner, Jürgen
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Rainer Nickel, Lexikon der antiken Literatur. Düsseldorf/Zürich (Artemis & Winkler) 1999, 904 S. (ISBN 3-538-07089-X).
description: Forum Classicum, Nr. 1 (2000): Forum Classicum
Thermodynamics in the vicinity of a relativistic quantum critical point in 2+1 dimensions
Creators: name: Rancon, A.
name: Kodio, O.
name: Dupuis, N.
name: Lecheminant, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the thermodynamics of the relativistic quantum O($N$) model in two space dimensions. In the vicinity of the zero-temperature quantum critical point (QCP), the pressure can be written in the scaling form $P(T)=P(0)+N(T^3/c^2)\calF_N(Δ/T)$ where $c$ is the velocity of the excitations at the QCP and $Δ$ is a characteristic zero-temperature energy scale. Using both a large-$N$ approach to leading order and the nonperturbative renormalization group, we compute the universal scaling function $\calF_N$. For small values of $N$ ($N\lesssim 10$) we find that $\calF_N(x)$ is nonmonotonous in the quantum critical regime ($|x|\lesssim 1$) with a maximum near $x=0$. The large-$N$ approach -- if properly interpreted -- is a good approximation both in the renormalized classical ($x\lesssim -1$) and quantum disordered ($x\gtrsim 1$) regimes, but fails to describe the nonmonotonous behavior of $\calF_N$ in the quantum critical regime. We discuss the renormalization-group flows in the various regimes near the QCP and make the connection with the quantum nonlinear sigma model in the renormalized classical regime. We compute the Berezinskii-Kosterlitz-Thouless transition temperature in the quantum O(2) model and find that in the vicinity of the QCP the universal ratio $\Tkt/ρ_s(0)$ is very close to $π/2$, implying that the stiffness $ρ_s(\Tkt^-)$ at the transition is only slightly reduced with respect to the zero-temperature stiffness $ρ_s(0)$. Finally, we briefly discuss the experimental determination of the universal function $\calF_2$ from the pressure of a Bose gas in an optical lattice near the superfluid--Mott-insulator transition.
description: v1) 16 pages, 10 figures. v2) Revised version
title: Payments on Digital Platforms: Resiliency, Interoperability and Welfare
Creators: name: Chiu, Jonathan
name: Wong, Tsz-Nga
Publisher: name: Bank of Canada
Year: 2021

description: "Digital platforms, such as Alibaba and Amazon, operate an online marketplace to facilitate transactions. How do these platforms make their business model choice between accepting cash and issuing tokens? What are the effects of these choices on the economy?

This paper develops a general equilibrium model to study the design choices of digital platforms and the implications for welfare, resiliency, and interoperability.

We find that a platform issues tokens if the interest rate is high, the platform scope is large, and the cyber risk is small. The equilibrium business model is not necessarily socially optimal because the platform does not take into consideration its impacts on activities beyond the platform itself. Regulations such as a minimum reserve requirement can reduce welfare."

description: "Les plateformes numériques comme Alibaba et Amazon exploitent une place de marché en ligne pour faciliter les transactions. Mais comment choisissent-elles entre accepter les paiements en monnaie fiduciaire ou émettre des jetons? Quels sont les effets de ce choix de modèle d’affaires sur l’économie?

Dans notre étude, nous élaborons un modèle d’équilibre général pour étudier les choix conceptuels des plateformes numériques et leurs implications pour le bien-être, la résilience et l’interopérabilité.

Nous observons que l’émission de jetons est choisie si le taux d’intérêt est élevé, la plateforme est de grande ampleur et le cyberrisque est faible. Le modèle d’équilibre n’est pas nécessairement optimal d’un point de vue social puisque les impacts sur les activités hors de la plateforme ne sont pas pris en considération. Nous constatons aussi que la réglementation, par exemple l’imposition d’une réserve minimale, peut mener à une perte de bien-être."
First MESSENGER orbital observations of Mercury's librations
Creators: name: Stark, Alexander
name: Oberst, Jürgen
name: Preusker, Frank
name: Peale, Stanton J.
name: Margot, Jean-Luc
name: Phillips, Roger J.
name: Neumann, Gregory A.
name: Smith, David E.
name: Zuber, Maria T.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Planets--Orbits
Planets--Rotation

description: We have coregistered laser altimeter profiles from 3 years of MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) orbital observations with stereo digital terrain models to infer the rotation parameters for the planet Mercury. In particular, we provide the first observations of Mercury's librations from orbit. We have also confirmed available estimates for the orientation of the spin axis and the mean rotation rate of the planet. We find a large libration amplitude of 38.9 ± 1.3 arc sec and an obliquity of the spin axis of 2.029 ± 0.085 arc min, results confirming that Mercury possesses a liquid outer core. The mean rotation rate is observed to be (6.13851804 ± 9.4 × 10−7)°/d (a spin period of 58.6460768 days ± 0.78 s), significantly higher than the expected resonant rotation rate. As a possible explanation we suggest that Mercury is undergoing long‐period librational motion, related to planetary perturbations of its orbit.