cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ladder operators and coherent states for the Rosen-Morse system and its rational extensions
Creators: name: Garneau-Desroches, Simon
name: Hussin, Véronique
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Ladder operators for the hyperbolic Rosen-Morse (RMII) potential are realized using the shape invariance property appearing, in particular, using supersymmetric quantum mechanics. The extension of the ladder operators to a specific class of rational extensions of the RMII potential is presented and discussed. Coherent states are then constructed as almost eigenstates of the lowering operators. Some properties are analyzed and compared. The ladder operators and coherent states constructions presented are extended to the case of the trigonometric Rosen-Morse (RMI) potential using a point canonical transformation.
Lévy on-off intermittency
Creators: name: van Kan, Adrian
name: Alexakis, Alexandros
name: Brachet, Marc-Etienne
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present a new form of intermittency, Lévy on-off intermittency, which arises from multiplicative $α$-stable white noise close to an instability threshold. We study this problem in the linear and nonlinear regimes, both theoretically and numerically, for the case of a pitchfork bifurcation with fluctuating growth rate. We compute the stationary distribution analytically and numerically from the associated fractional Fokker-Planck equation in the Stratonovich interpretation. We characterize the system in the parameter space $(α,β)$ of the noise, with stability parameter $α\in (0,2)$ and skewness parameter $β\in[-1,1]$. Five regimes are identified in this parameter space, in addition to the well-studied Gaussian case $α=2$. Three regimes are located at $1
On the Evolutionary History of Stars and their Fossil Mass and Light
Creators: name: Fardal, Mark A.
name: Katz, Neal
name: Weinberg, David H.
name: Dav'e, Romeel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The total extragalactic background radiation can be an important test of the global star formation history (SFH). Using direct observational estimates of the SFH, along with standard assumptions about the initial mass function (IMF), we calculate the total extragalactic background radiation and the observed stellar density today. We show that plausible SFHs allow a significant range in each quantity, but that their ratio is very tightly constrained. Current estimates of the stellar mass and extragalactic background are difficult to reconcile, as long as the IMF is fixed to the Salpeter slope above 1 Msun. The joint confidence interval of these two quantities only agrees with that determined from the allowed range of SFH fits at the 3-sigma level, and for our best-fit values the discrepancy is about a factor of two. Alternative energy sources that contribute to the background, such as active galactic nuclei (AGN), Population III stars, or decaying particles, appear unlikely to resolve the discrepancy. However, changes to the IMF allow plausible solutions to the background problem. The simplest is an average IMF with an increased contribution from stars around 1.5--4 Msun. A ``paunchy'' IMF of this sort could emerge as a global average if low mass star formation is suppressed in galaxies experiencing rapid starbursts. Such an IMF is consistent with observations of star-forming regions, and would help to reconcile the fossil record of star formation with the directly observed SFH.
description: 21 pages, 7 figures, 3 tables; submitted to Monthly Notices
Wavelength Dependence of Activity-Induced Photometric Variations for Young Cool Stars in Hyades
Creators: name: Miyakawa, Kohei
name: Hirano, Teruyuki
name: Fukui, Akihiko
name: Mann, Andrew W.
name: Gaidos, Eric
name: Sato, Bun'ei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate photometric variations due to stellar activity which induce systematic radial-velocity errors (so-called "jitter") for the four targets in the Hyades open cluster observed by the K2 mission (EPIC 210721261, EPIC 210923016, EPIC 247122957, and EPIC 247783757). Applying Gaussian process regressions to the K2 light curves and the near-infrared (NIR) light curves observed with the IRSF 1.4-m telescope, we derive the wavelength dependences of the photometric signals due to stellar activity. To estimate the temporal variations in the photometric variability amplitudes between the two observation periods of K2 and IRSF, separated by more than 2 years, we analyze a number of K2 targets in Hyades that have also been observed in Campaigns 4 and 13 and find a representative variation rate over 2 years of 38%pm71%. Taking this temporal variation into account, we constrain projected sizes and temperature contrast properties of the starspots in the stellar photosphere to be approximately 10% and 0.95, respectively. These starspot properties can induce relatively large differences in the variability amplitude over different observational passbands, and we find that radial-velocity jitter may be more suppressed in the NIR than previously expected. Our result supports profits of on-going exoplanet search projects that are attempting to detect or confirm young planets in open clusters via radial-velocity measurements in the NIR.
description: 19 pages, 14 figures, 5 tables; Accepted for publication to AJ
The Regge limit of AdS$_3$ holographic correlators with heavy states: towards the black hole regime
Creators: name: Ceplak, Nejc
name: Hughes, Marcel R. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the Regge limit of holographic 4-point correlation functions in AdS$_3\times S^3$ involving two heavy and two light operators. In this kinematic regime such correlators can be reconstructed from the bulk phase shift accumulated by the light probe as it traverses the geometry dual to the heavy operator. We work perturbatively -- but to arbitrary orders -- in the ratio of the heavy operator's conformal dimension to the dual CFT${}_2$'s central charge, thus going beyond the low order results of arXiv:1812.03120 and arXiv:2007.12118. In doing so, we derive all-order relations between the bulk phase shift and the Regge limit OPE data of a class of heavy-light multi-trace operators exchanged in the cross-channel. Furthermore, we analyse two examples for which the relevant 4-point correlators are known explicitly to all orders: firstly the case of heavy operators dual to AdS${}_3$ conical defect geometries and secondly the case of non-trivial smooth geometries representing microstates of the two-charge D1-D5 black hole.
description: 34 pages, 2 figures, v2 - added references
IGR J18483-0311: an accreting X-ray pulsar observed by INTEGRAL
Creators: name: Sguera, V.
name: Hill, A. B.
name: Bird, A. J.
name: Dean, A. J.
name: Bazzano, A.
name: Ubertini, P.
name: Masetti, N.
name: Landi, R.
name: Malizia, A.
name: Clark, D. J.
name: Molina, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: IGR J18483-0311 is a poorly known transient hard X-ray source discovered by INTEGRAL during observations of the Galactic Center region performed between 23--28 April 2003. Aims: To detect new outbursts from IGR J18483-0311 using INTEGRAL and archival Swift XRT observations and finally to characterize the nature of this source using the optical/near-infrared (NIR) information available through catalogue searches. Results: We report on 5 newly discovered outbursts from IGR J18483-0311 detected by INTEGRAL.For two of them it was possible to constrain a duration of the order of a few days. The strongest outburst reached a peak flux of 120 mCrab (20--100 keV): its broad band JEM--X/ISGRI spectrum (3--50 keV) is best fitted by an absorbed cutoff power law with photon index=1.4+/-0.3, cutoff energy of ~22 keV and Nh ~9x10^22 cm^-2. Timing analysis of INTEGRAL data allowed us to identify periodicities of 18.52 days and 21.0526 seconds which are likely the orbital period of the system and the spin period of the X-ray pulsar respectively. Swift XRT observations of IGR J18483$-$0311 provided a very accurate source position which strongly indicates a highly reddened star in the USNO--B1.0 and 2MASS catalogues as its possible optical/NIR counterpart. Conclusions: The X-ray spectral shape, the periods of 18.52 days and 21.0526 seconds, the high intrinsic absorption, the location in the direction of the Scutum spiral arm and the highly reddened optical object as possible counterpart, all favour the hypothesis that IGR J18483-0311 is a HMXB with a neutron star as compact companion. The system is most likely a Be X-ray binary, but a Supergiant Fast X-ray Transient nature can not be entirely excluded.
description: accepted for publication in A&A, 10 pages, 17 figures, 4 tables
Nampeyo and the Sikyatki Revival : Creating a legend with Hopi ceramics
Creators: name: Tibbel, Deborah Elizabeth
Publisher: name: University of British Columbia
Year: 2009

description: Since the closing years of the nineteenth century, the name "Nampeyo" has been synonymous with pottery produced on the Hopi Reservation in northeastern Arizona. By re-introducing and re-interpreting various pre-Hispanic forms, designs, and colour schemes, Nampeyo became the icon of a new approach to ceramic production that was quickly adopted by other potters. This new style came to be known as . "Sikyatki Revival Ware", in association with archaeological excavations being conducted during the 1890s at the unihabited Hopi town of that name. As one of the first Native artists to be acknowledged by Euro-Americans, the story of Nampeyo was manipulated according to a colonial discourse which simultaneously idealized and marginalized the artistic motivations and production of colonized Others. In the case of Nampeyo, this involved a notion of Pueblo society and art as conservative, static, and incapable of independent change. This study examines such notions in relation to the history of Hopi pottery, both before and after contact with European influences, as a means of demonstrating the dynamic aspects of Pueblo ceramics. Furthermore, I argue that the story of Nampeyo, and her relationships with numerous Euro-American patrons is the product of conflicting dominant interests, with little or no regard for Native agency. Rather, as a member of a subordinate group, Nampeyo created a niche for the concept of "Native art" acceptable in both Pueblo and Euro-American terms, while working from within the constricted boundaries of colonial domination.
High temperature memory in (Pb/La)(Zr/Ti)O_3 as intrinsic of the relaxor state rather than due to defect relaxation
Creators: name: Cordero, F.
name: Craciun, F.
name: Franco, A.
name: Galassi, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: It has been recently shown that the memory of multiple aging stages, a phenomenon considered possible only below the glass transition of some glassy systems, appears also above that temperature range in the relaxor ferroelectric (Pb/La)(Zr/Ti)O_3 (PLZT). Doubts exist whether memory at such high temperature is intrinsic of the glassy relaxor state or is rather due to migration of mobile defects. It is shown that the memory in the electric susceptibility and elastic compliance of PLZT 9/65/35 is not enhanced but depressed by mobile defects like O vacancies, H defects and mobile charges resulting from their ionization. In addition, memory is drastically reduced at La contents slightly below the relaxor region of the phase diagram, unless aging is protracted for long times (months at room temperature). This is considered as evidence that in the non relaxor case memory is indeed due to slow migration of defects, while in the La rich case it is intrinsic of the relaxor state, even above the temperature of the susceptibility maximum.
description: 9 pages, 8 figures, submitted to Phys. Rev. B
Hierarchical Recurrent Neural Networks for Conditional Melody Generation with Long-term Structure
Creators: name: Guo, Zixun
name: Dimos, Makris
name: Dorien, Herremans
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The rise of deep learning technologies has quickly advanced many fields, including that of generative music systems. There exist a number of systems that allow for the generation of good sounding short snippets, yet, these generated snippets often lack an overarching, longer-term structure. In this work, we propose CM-HRNN: a conditional melody generation model based on a hierarchical recurrent neural network. This model allows us to generate melodies with long-term structures based on given chord accompaniments. We also propose a novel, concise event-based representation to encode musical lead sheets while retaining the notes' relative position within the bar with respect to the musical meter. With this new data representation, the proposed architecture can simultaneously model the rhythmic, as well as the pitch structures in an effective way. Melodies generated by the proposed model were extensively evaluated in quantitative experiments as well as a user study to ensure the musical quality of the output as well as to evaluate if they contain repeating patterns. We also compared the system with the state-of-the-art AttentionRNN. This comparison shows that melodies generated by CM-HRNN contain more repeated patterns (i.e., higher compression ratio) and a lower tonal tension (i.e., more tonally concise). Results from our listening test indicate that CM-HRNN outperforms AttentionRNN in terms of long-term structure and overall rating.
Πολυμεσική διαδικτυακή πύλη βυζαντινής μουσικής
Creators: name: Καζδαρίδης, Γεώργιος Κυριάκου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πύλη μάθησης
Παγκόσμιος ιστός
Βυζαντινή μουσική
Learning portal
Web
Byzantine music

description: Η μεταπτυχιακή εργασία αυτή έχει σαν σκοπό τη δημιουργία μιας ολοκληρωμένης πολυμεσικής διαδικτυακής πύλης, με κύριο αντικείμενο πληροφορίες και βιντεομαθήματα βυζαντινής μουσικής. Στοχεύει στην ανάπτυξη δεξιοτήτων και ικανοτήτων των χρηστών, τη βελτίωση στις μουσικές επιδόσεις τους, αλλά και την αξιολόγηση του γνωσιακού επιπέδου των χρηστών, μετά το πέρας των προαπαιτούμενων μαθημάτων. Τέλος αναδεικνύει την ευκολία που προσφέρουν τα διάφορα CMS (με έμφαση το δημοφιλές wordpress) και την ευελιξία και άνεση στην μάθηση που προσφέρουν στον χρήστη από οποιαδήποτε συσκευή, στον χώρο επιλογής του, κάθε ώρα και στιγμή σε όλες τις ομάδες ανθρώπων. Η διαδικτυακή πύλη παρέχει σημαντικά εργαλεία για αλληλεπίδραση, σύγχρονη επικοινωνία και συνεργασία με εύκολη πρόσβαση και χρήση.
description: This postgraduate thesis aims at creating an integrated multimedia portal, with information and videos about byzantine music as its main subject. It aims at developing users' skills and abilities, improving their musical performance, and assessing the cognitive level of users after the completion of the prerequisite courses. Lastly, it gives prominence to the ease that the various CMS provide (with the emphasis on popular wordpress) and the versatility and ease of learning offered to the user by any device, at the place of his choice, at any time and in all groups of people. The portal provides important tools for interaction, synchronous communication and collaboration with easy access and use.
The targum (1950:Apr. 4 - 1950:Apr. 28)
Creators: name: No Name Supplied
Publisher: name: Targum Association
Year: 1950

description: Some University historians indicate that the Targum was first published as an annual in 1867, but of this we have no extant evidence. In January 1869, the Targum as we now know it, made its appearance as a monthly paper that concerned itself with student “literary contributions” and college news as well as serving as a vehicle for bringing news to alumni and the general public. The newspaper, which originally was for sale, varied in frequency over the years as did its title (The Targum, Rutgers Targum, Rutgers Daily Targum, and Daily Targum). The newspaper has continuously been published since 1869 with the exception of 19 months during the second world war, between February 1944 and October 1945. The Targum was published by the students of Rutgers College, and later Rutgers University—New Brunswick represented through the years as the Targum Association, Rutgers Targum Association, and Rutgers College Targum. As a student organization, the Targum operated under the oversight of the dean of students and student government but in October 1980, the Targum became an independent college paper.
X-ray Radio Correlation In Black Hole Sources
Creators: name: Rao, A. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the X-ray - radio correlation in Galactic black hole sources. We highlight some of the results which extend the flux-flux relations to sources with very high accretion rates. Some of the recent results indicate that the synchrotron process is unlikely to be the mechanism responsible for the X-ray emission, particularly at high accretion rates. We present a truncated accretion disk scenario and argue that accretion rate and accretion disk geometry ultimately act as a driver of the X-ray - radio correlation. We stress the importance of wide-band X-ray spectral measurements to understand the disk-jet connection and briefly outline some attempts made in the Indian context to build instruments for wide-band X-ray spectroscopy.
description: 11 pages, 5 figures; accepted for publication in the proceedings of VI Microquasar Workshop: Microquasars and Beyond, 18-22 September 2006, Como (Italy), ed: T. Belloni (2006)
Efficient simulation of quantum evolution using dynamical coarse-graining
Creators: name: Khasin, M.
name: Kosloff, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A novel scheme to simulate the evolution of a restricted set of observables of a quantum system is proposed. The set comprises the spectrum-generating algebra of the Hamiltonian. The idea is to consider a certain open-system evolution, which can be interpreted as a process of weak measurement of the distinguished observables performed on the evolving system of interest. Given that the observables are "classical" and the Hamiltonian is moderately nonlinear, the open system dynamics displays a large time-scales separation between the dephasing of the observables and the decoherence of the evolving state in the basis of the generalized coherent states (GCS), associated with the spectrum-generating algebra. The time scale separation allows the unitary dynamics of the observables to be efficiently simulated by the open-system dynamics on the intermediate time-scale.The simulation employs unraveling of the corresponding master equations into pure state evolutions, governed by the stochastic nonlinear Schroedinger equantion (sNLSE). It is proved that GCS are globally stable solutions of the sNLSE, if the Hamilonian is linear in the algebra elements.
description: The version submitted to Phys. Rev. A, 28 pages, 3 figures, comments are very welcome
Προγραμματισμός Τοπικής Ανάπτυξης: Place Branding για τον Δήμο Θερμαϊκού
Creators: name: Μαρωνίδου, Ιφιγένεια Κυριάκου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Branding του τόπου
Δήμος Θερμαϊκού
Παραθαλάσσιος προορισμός
Place Branding
Municipality of Thermaikos
Seaside Destination

description: Στο παγκοσμιοποιημένο περιβάλλον στο οποίο δρα και εξελίσσεται η κοινωνία σήμερα, οι τόποι, μέσα σε συνθήκες ανταγωνισμού, αναζητούν πρακτικές, ώστε να προσδιορίσουν και να αναδείξουν την ταυτότητά τους για την προσέλκυση των αγορών-στόχων και την οικονομική τους ανάπτυξη. Οι πρακτικές branding που εφαρμόζονται, εντοπίζουν τα μοναδικά χαρακτηριστικά του κάθε τόπου και γύρω από αυτά οικοδομείται η εικόνα, η οποία θα προβληθεί στις στοχευμένες αγορές, μέσα από εργαλεία προώθησης και επικοινωνίας. Μέσα από τη διαδικασία branding προτείνονται οι παρεμβάσεις, οι οποίες θα συμβάλλουν στη βελτίωση της ποιότητας του «προσφερόμενου αγαθού». Ο Δήμος Θερμαϊκού αποτελεί έναν τόπο που χρίζει παρεμβάσεων και ολοκληρωμένου σχεδίου branding, αφού αποτελεί έναν δήμο με ιδιαίτερα ανεκμετάλλευτα χαρακτηριστικά κοντά σε ένα σημαντικό μητροπολιτικό κέντρο, τη Θεσσαλονίκη, αλλά με χαμηλή αναγνωρισιμότητα και απροσδιόριστη ταυτότητα.
description: In the globalized environment in which society is currently operating and evolving, places in competitive conditions, are looking for practices to identify and demonstrate their identity in order to attract target markets and grow their economy. The applied branding practices identify the unique features of each place and build the image, which will be shown in the targeted markets through promotional and communication tools. Through the branding process, interventions are proposed which will help to improve the quality of the “offered good”. The Municipality of Thermaikos is a place requiring interventions and a comprehensive branding project, because it is a municipality with very unexploited features close to a metropolitan city, Thessaloniki, but with low awareness and undetermined identity.
Experimental study of laser detected magnetic resonance based on atomic alignment
Creators: name: Di Domenico, Gianni
name: Bison, Georg
name: Groeger, Stephan
name: Knowles, Paul
name: Pazgalev, Anatoly S.
name: Rebetez, Martin
name: Saudan, Herve
name: Weis, Antoine
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present an experimental study of the spectra produced by optical/radio-frequency double resonance in which resonant linearly polarized laser light is used in the optical pumping and detection processes. We show that the experimental spectra obtained for cesium are in excellent agreement with a very general theoretical model developed in our group and we investigate the limitations of this model. Finally, the results are discussed in view of their use in the study of relaxation processes in aligned alkali vapors.
description: 8 pages, 9 figures. Submitted to Phys. Rev. A. Related to physics/0605234
Enhanced Forman curvature and its relation to Ollivier curvature
Creators: name: Tee, Philip
name: Trugenberger, C. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recent advances in emergent geometry and discretized approaches to quantum gravity have relied upon the notion of a discrete measure of graph curvature. We focus on the two main measures that have been studied, the so-called Ollivier-Ricci and Forman-Ricci curvatures. These two approaches have a very different origin, and both have advantages and disadvantages. In this work we study the relationship between the two measures for a class of graphs that are important in quantum gravity applications. We discover that under a specific set of circumstances they are equivalent, potentially opening up the possibility of exploiting the relative strengths of both approaches in models of emergent spacetime and quantum gravity.
Stress and depressive symptoms related excessive daytime sleepiness in Thai medical students, Srinakharinwirot University
Creators: name: Kittipong Kongsomboon, Chairat Neruntarat
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2009
Subjects: excessive daytime sleepiness, stress, depression, medical students

description: 2, 17, Journal of Medicine and Health Sciences
Constraints on the size of the extra dimension from Kaluza-Klein gravitino decay
Creators: name: Gherson, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the consequences of the gravitino decay into dark matter. We suppose that the lightest neutralino is the main component of dark matter. In our framework gravitino is heavy enough to decay before Big Bang Nucleosynthesis starts. We consider a model coming from a five dimensional supergravity compactified on $S^1/Z_2$ with gravity in the bulk and matter localized on tensionless branes at the orbifold fixed points. We require that the dark matter, which is produced thermally and in the decay of Kaluza-Klein modes of gravitino, has an abundance compatible with observation. We deduce from our model that there are curves of constraints between the size of the extra-dimension and the reheating temperature of the universe after inflation.
description: 21 pages, 21 figures,LYCEN-2007-01, Fev 2007. Second version: comments added, typos, references added. To be published in Phys.Rev.D
D7.3: 1st User workshop report
Creators: name: Evrard, Estérine
name: Fitzhenry, Deirdre
name: Gourcuff, Claire
name: Kassis, Dimitris
name: Klein, Birgit
name: Notarstefano, Giulio
name: Pouliquen, Sylvie
Publisher: name: Zenodo
Year: 2019

description: The 7th Euro-Argo Science Meeting is one of the main place for science around Argo in Europe. Held on a biennal basis by Euro-Argo, this event is a way of supporting and strenghtening European Argo community.
 This meeting report provides a summary of the main highlights and key messages delivered during this 7th edition. The
Rouse model with fluctuating internal friction
Creators: name: Kailasham, R.
name: Chakrabarti, Rajarshi
name: Prakash, J. Ravi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A coarse-grained bead-spring-dashpot chain model with the dashpots representing the presence of internal friction, is solved exactly numerically, for the case of chains with more than two beads. Using a decoupling procedure to remove the explicit coupling of a bead's velocity with that of its nearest neighbors, the governing set of stochastic differential equations are solved with Brownian dynamics simulations to obtain material functions in oscillatory and steady simple shear flow. Simulation results for the real and imaginary components of the complex viscosity have been compared with the results of previously derived semi-analytical approximations, and the difference in the predictions are seen to diminish with an increase in the number of beads in the chain. The inclusion of internal friction results in a non-monotonous variation of the viscosity with shear rate, with the occurrence of continuous shear-thickening following an initial shear-thinning regime. The onset of shear-thickening in the first normal stress coefficient is pushed to lower shear rates with an increase in the internal friction parameter.
description: 24 pages, 10 figures, includes supplementary information
Dynamical Entanglement in Non-Relativistic, Elastic Scattering
Creators: name: Harshman, N. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This article considers dynamical entanglement in non-relativistic particle scattering. Three questions are explored: what kinds of entanglement occur in this system, how do global symmetries constrain entanglement, and how do the boundary conditions of scattering affect dynamical entanglement? First, a simple model of scattering spin systems is considered, then the full system is discussed.
description: 4 pages, no figs., submission to conf. proc. of Quantum 2006, III Workshop ad memoriam of Carlo Novero
Contextualized Rewriting for Text Summarization
Creators: name: Bao, Guangsheng
name: Zhang, Yue
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Extractive summarization suffers from irrelevance, redundancy and incoherence. Existing work shows that abstractive rewriting for extractive summaries can improve the conciseness and readability. These rewriting systems consider extracted summaries as the only input, which is relatively focused but can lose important background knowledge. In this paper, we investigate contextualized rewriting, which ingests the entire original document. We formalize contextualized rewriting as a seq2seq problem with group alignments, introducing group tag as a solution to model the alignments, identifying extracted summaries through content-based addressing. Results show that our approach significantly outperforms non-contextualized rewriting systems without requiring reinforcement learning, achieving strong improvements on ROUGE scores upon multiple extractive summarizers.
More Real than Real: A Study on Human Visual Perception of Synthetic Faces
Creators: name: Lago, Federica
name: Pasquini, Cecilia
name: Böhme, Rainer
name: Dumont, Hélène
name: Goffaux, Valérie
name: Boato, Giulia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Deep fakes became extremely popular in the last years, also thanks to their increasing realism. Therefore, there is the need to measures human's ability to distinguish between real and synthetic face images when confronted with cutting-edge creation technologies. We describe the design and results of a perceptual experiment we have conducted, where a wide and diverse group of volunteers has been exposed to synthetic face images produced by state-of-the-art Generative Adversarial Networks (namely, PG-GAN, StyleGAN, StyleGAN2). The experiment outcomes reveal how strongly we should call into question our human ability to discriminate real faces from synthetic ones generated through modern AI.
title: On the oracle complexity of first-order and derivative-free algorithms for smooth nonconvex minimization
Creators: name: Cartis, C
name: Gould, N I M
name: Toint, PL
Publisher: name: Science and Technology Facilities Council
Year: 2010

description: The (optimal) function/gradient evaluations worst-case complexity analysis available for the Adaptive Regularizations algorithms with Cubics (ARC) for nonconvex smooth unconstrained optimization is extended to finite-difference versions of this algorithm, yielding complexity bounds for first-order and derivative free methods applied on the same problem class. A comparison with the results obtained for derivative-free methods by Vicente (2010) is also discussed, giving some theoretical insight on the relative merits of various methods in this popular class of algorithms.
A lower bound for nodal count on discrete and metric graphs
Creators: name: Berkolaiko, Gregory
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34B45, 05C50, 15A18

description: According to a well-know theorem by Sturm, a vibrating string is divided into exactly N nodal intervals by zeros of its N-th eigenfunction. Courant showed that one half of Sturm's theorem for the strings applies to the theory of membranes: N-th eigenfunction cannot have more than N domains. He also gave an example of a eigenfunction high in the spectrum with a minimal number of nodal domains, thus excluding the existence of a non-trivial lower bound. An analogue of Sturm's result for discretizations of the interval was discussed by Gantmacher and Krein. The discretization of an interval is a graph of a simple form, a chain-graph. But what can be said about more complicated graphs? It has been known since the early 90s that the nodal count for a generic eigenfunction of the Schrodinger operator on quantum trees (where each edge is identified with an interval of the real line and some matching conditions are enforced on the vertices) is exact too: zeros of the N-th eigenfunction divide the tree into exactly N subtrees. We discuss two extensions of this result in two directions. One deals with the same continuous Schrodinger operator but on general graphs (i.e. non-trees) and another deals with discrete Schrodinger operator on combinatorial graphs (both trees and non-trees). The result that we derive applies to both types of graphs: the number of nodal domains of the N-th eigenfunction is bounded below by N-L, where L is the number of links that distinguish the graph from a tree (defined as the dimension of the cycle space or the rank of the fundamental group of the graph). We also show that if it the genericity condition is dropped, the nodal count can fall arbitrarily far below the number of the corresponding eigenfunction.
description: 15 pages, 4 figures; Minor corrections: added 2 important references
Ανάλυση Δεδομένων για τη Διάρκεια Παραμονής στη Θέση Εργασίας
Creators: name: Δασκαλόπουλος, Ευάγγελος Αιμίλιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανάλυση Δεδομένων
Ανάλυση Επιβίωσης
Εργασία
Data analysis
Survival Analysis
Job position

description: Η εργασία και η καριέρα του ανθρώπου έχει μεγάλη σημασία για τον ίδιο, για οικονομικούς και ψυχολογικούς λόγους. Ο άνθρωπος περνάει περισσότερο από το μισό της ζωής του ως εργαζόμενος και συνεπώς τον απασχολεί η επαγγελματική αποκατάσταση. Η ανάλυση του κοινωνικού αυτού φαινομένου που ονομάζεται εργασία μπορεί να βοηθήσει στη σωστότερη απόφαση επιλογών, που αφορούν την εκπαίδευση, τις δεξιότητες που χρειάζεται και άλλα ανυπολόγιστα δεδομένα. Στη παρούσα εργασία, θα ασχοληθούμε με την ανάλυση επιβίωσης και την αξιοποίηση των μεθοδολογιών του κλάδου αυτού, αναλύοντας λεπτομερέστατα τον τρόπον επιλογής μεθοδολογίας, ανάλογα με τα δεδομένα και το φαινόμενο μελέτης, όπως και των ίδιων των μεθόδων. Έπειτα, θα παραθέσουμε τον υπολογιστικό τρόπο ανάλυσης και τις συναρτήσεις που χρησιμοποιήθηκαν μέσα από προγραμματιστικές εντολές. Σκοπός της παρούσης διπλωματικής εργασίας είναι να μελετηθεί ο σωστός τρόπος διαχείρισης και ανάλυσης δεδομένων επιβίωσης. Κατόπιν, με τα αποτελέσματα τα οποία θα παραχθούν, να οδηγηθούμε σε καθοριστικά συμπεράσματα για το φαινόμενο το οποίο μελετήσαμε, την παραμονή στην εργασία. Βασιζόμενοι στα αποτελέσματα, ακόμα, θα μπορεί να διακριθεί ποιοι συντελεστές επηρεάζουν το φαινόμενο. Στο τέλος, θα γίνει λεπτομερείς σχολιασμός και ανάλυση των συμπερασμάτων.
description: The career of man is of great importance to him for economic and psychological reasons. Man spends more than half his life as a worker and therefore occupies professional rehabilitation. An analysis of this phenomenon known as work can help in choosing the right choices about education, the skills they need, and other invaluable information. In the present thesis, we deal with the analysis of survival and the utilization of the methods of the industry, analyzing in more detail the way of choosing the method according to the data and the phenomenon of the study as well as with these methods. Next, we will quote the computational mode of analysis and the functions that were used through programming commands. The purpose of this diploma thesis is to study the correct way of managing and analyzing survival data. Then, with the results to be produced, we will lead to decisive conclusions about the phenomenon we studied, the stay at work. Based on the results, even the factors influencing the phenomenon could be distinguished. Finally, detailed commentary and analysis of the conclusions will be made.
Project management: Δαχείριση μελέτης έργου οδοποιίας στο MS Project
Creators: name: Σαρακηνού, Ιωάννα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διαχείριση έργων
Τεχνικά έργα
Χρονικός προγραμματισμός
Project management
MS Project
Gantt chart

description: Θέμα της παρούσας διπλωματικής εργασίας είναι η Διαχείριση Έργων. Στην εργασία εξηγούνται και αναλύονται οι βασικότερες έννοιες της Διαχείρισης Έργων. Στη συνέχεια της εργασίας γίνεται αναφορά στη Δικτυακή ανάλυση και στην χρησιμότητά της στο γνωστικό πεδίο της Διαχείρισης Έργων. Σε αυτό το σημείο αναλύονται τα δύο βασικότερα είδη δικτύων, καθώς και το διάγραμμα Gantt. Οι τεχνικές PERT και CPM αποτελούν το επόμενο αντικείμενο μελέτης, τόσο στην περίπτωση όπου οι χρόνοι δραστηριοτήτων είναι γνωστοί, όσο και στην περίπτωση αβέβαιων χρόνων δραστηριοτήτων. Το κομμάτι αυτό ολοκληρώνεται με τη σχέση χρόνου και κόστους στη Διαχείριση ενός έργου. Το θεωρητικό υπόβαθρο της Διαχείρισης Έργων ακολουθείται από τη διαχείριση της μελέτης ενός έργου οδοποιίας, όπου αφορά τη βελτίωση υφιστάμενου οδικού δικτύου Ασπρόχωμα-Μεσσήνη-Ριζόμυλος της Ε.Ο. Νο 82. Η διαχείριση πραγματοποιήθηκε με χρήση του λογισμικού MS Project 2016, και περιλαμβάνει τη διαχείριση χρόνου, ανθρωπίνων πόρων και τη μελέτη του συνολικού κόστους του έργου. Η εργασία κλείνει με τα συμπεράσματα και τις προοπτικές σε σχέση με τη Διαχείριση Έργων.
description: Subject of this thesis is Project Management. The study explains and analyzes the main concepts of project management. Next follows a reference to the Network Analysis and its usefulness in the field of Project Management. At this point, the two main types of networks, as well as the Gantt chart, are analyzed. PERT and CPM techniques are the next object of study. Both the case of known activities time and the case of uncertain times of activities are analyzed. This section ends with the relation of time and cost in managing a project. The theoretical background of Project Management is followed by the management of a road construction project, which concerns the improvement of the existing road network Asprochoma-Messini-Rizomylos. No 82. using MS Project 2016 software. The management of this project includes time and human resources management, and the study of the total project cost. The thesis ends with some conclusions and proposals in relation to Project Management.
Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
Creators: name: Rammelmüller, Lukas
name: Hou, Yaqi
name: Drut, Joaquín E.
name: Braun, Jens
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We theoretically study the pairing behavior of the unitary Fermi gas in the normal phase. Our analysis is based on the static spin susceptibility, which characterizes the response to an external magnetic field. We obtain this quantity by means of the complex Langevin approach and compare our calculations to available literature data in the spin-balanced case. Furthermore, we present results for polarized systems, where we complement and expand our analysis at high temperature with high-order virial expansion results. The implications of our findings for the phase diagram of the spin-polarized unitary Fermi gas are discussed, in the context of the state of the art.
description: 8 pages, 3 figures (published version)
Overlap between usual and modified Bethe vectors
Creators: name: Belliard, S.
name: Slavnov, N. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the overlap of Bethe vectors of the XXX spin chain with a diagonal twist and the modified Bethe vectors with a general twist. We find a determinant representation for this overlap under one additional condition on the twist parameters. Such objects arise in the calculations of nonequilibrium physics.
description: 19 pages, no figures
In-medium similarity renormalization group with three-body operators
Creators: name: Heinz, M.
name: Tichai, A.
name: Hoppe, J.
name: Hebeler, K.
name: Schwenk, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Over the past decade the in-medium similarity renormalization group (IMSRG) approach has proven to be a powerful and versatile ab initio many-body method for studying medium-mass nuclei. So far, the IMSRG was limited to the approximation in which only up to two-body operators are incorporated in the renormalization group flow, referred to as the IMSRG(2). In this work, we extend the IMSRG(2) approach to fully include three-body operators yielding the IMSRG(3) approximation. We use a perturbative scaling analysis to estimate the importance of individual terms in this approximation and introduce truncations that aim to approximate the IMSRG(3) at a lower computational cost. The IMSRG(3) is systematically benchmarked for different nuclear Hamiltonians for ${}^{4}\text{He}$ and ${}^{16}\text{O}$ in small model spaces. The IMSRG(3) systematically improves over the IMSRG(2) relative to exact results. Approximate IMSRG(3) truncations constructed based on computational cost are able to reproduce much of the systematic improvement offered by the full IMSRG(3). We also find that the approximate IMSRG(3) truncations behave consistently with expectations from our perturbative analysis, indicating that this strategy may also be used to systematically approximate the IMSRG(3).
description: 23 pages, 10 figures, published version
Wind Energy as a Use Case for General Energy System Integration
Creators: name: Clive, Peter James Macdonald
Publisher: name: Zenodo
Year: 2021

description: Emerging data sharing protocols such as Open Energy, and the broader context of green finance and sustainable development goals, are discussed. The practical example of the digital integration of wind energy projects is considered, with particular emphasis on the role of wind data, specifically those obtained using lidar. Originally presented at the Windpower Data and Digital Innovation Forum 2021.
The Razumov-Stroganov conjecture: Stochastic processes, loops and combinatorics
Creators: name: de Gier, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A fascinating conjectural connection between statistical mechanics and combinatorics has in the past five years led to the publication of a number of papers in various areas, including stochastic processes, solvable lattice models and supersymmetry. This connection, known as the Razumov-Stroganov conjecture, expresses eigenstates of physical systems in terms of objects known from combinatorics, which is the mathematical theory of counting. This note intends to explain this connection in light of the recent papers by Zinn-Justin and Di Francesco.
description: 6 pages, 4 figures, JSTAT News & Perspectives
Η Εποχή του Χαλκού στο μέσο ρου του Αλιάκμονα
Creators: name: Μαγγουρέτσιου, Ευανθία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Εποχή του Χαλκού
Οικισμοί της Εποχής του Χαλκού
Kεραμική της Εποχής του Χαλκού
Μέση Εποχή του Χαλκού
Οικισμοί της Μέσης Εποχής του Χαλκού
Kεραμική της Μέσης Εποχής του Χαλκού
Bronze Age
Settlements of Bronze Age
Pottery of Bronze Age
Middle Bronze Age
Settlements of Middle Bronze Age
Pottery of Middle Bronze Age

description: Η παρούσα μεταπτυχιακή διατριβή εξετάζει οικιστικά κατάλοιπα δύο εγκαταστάσεων του πρώτου μισού της 2ης χιλιετίας π.χ., στις θέσεις Πολεμίστρα Αιανής και Παλιόχανο Σπάρτου. Αποτελούσαν παραποτάμιους οικισμούς που είχαν ιδρυθεί κοντά στην αριστερή όχθη του ποταμού Αλιάκμονα, σε απόσταση 8 χλμ. περίπου ο ένας από τον άλλο και εντοπίστηκαν στην παρόχθια ζώνη της τεχνητής λίμνης Πολυφύτου, η οποία κατέκλυσε την κοιλάδα του μέσου ρου του ποταμού, στην Περιφερειακή Ενότητα Κοζάνης. Οι διαθέσιμες ραδιοχρονολογήσεις εντάσσουν την Πολεμίστρα στις φάσεις Ι-ΙΙ της Μέσης Εποχής του Χαλκού και το Παλιόχανο, αντίστοιχα, στις φάσεις ΙΙ-ΙΙΙ. Κύριος σκοπός της διατριβής ήταν η αναλυτική παρουσίαση της κεραμικής των δύο θέσεων. Παράλληλα, εξετάστηκαν, στο σύνολό τους, τα στοιχεία που ανέκυψαν από την επιφανειακή έρευνα και τη σωστική ανασκαφή στις δύο θέσεις, τα σταθερά και κινητά ευρήματα που έφερε στο φως η ανασκαφή, όπως και το επιφανειακό αρχαιολογικό υλικό από τη θέση Παλιόχανο Σπάρτου, το οποίο περιλαμβάνει και υλικό της Αρχαιότερη Νεολιθικής.
description: The present thesis examines residential remains at the sites Polemistra at Aiani and Paliochano at Sparto, dated at the first half of the 2nd millennium BC. They were riverside settlements, established near the left bank of the Aliakmon River, 8 km far from each other and found in the riparian zone of the artificial lake Polyfytos, which flooded the valley of the middle course of the river, in Kozani Prefecture. Polemistra dates to the Middle Bronze Age Ι-ΙΙ and Paliochano to the Middle Bronze Age II-III. The main aim of this study was to analyze the pottery concerning the two settlements. Another aim was to examine, all data coming up from survey and rescue excavation at the two sites, non-portable and portable finds the investigation brought to light, as well as the survey archaeological material from Paliochano at Sparto, the latter including Early Neolithic material, as well.
On affine coordinates of the tau-function for open intersection numbers
Creators: name: Wang, Zhiyuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In Alexandrov's work \cite{al2, al3} it has been shown that the extended partition function $\exp(F^{o,ext}+F^c)$ introduced by Buryak in \cite{bu, bu2} is a tau-function of the KP hierarchy. In this work, we compute the affine coordinates of this tau-function on the Sato Grassmannian, and rewrite the Virasoro constraints as recursions for the affine coordinates in the fermionic picture. As applications we derive some formulas for the extended partition function and the connected $n$-point functions using methods developed by Zhou in \cite{zhou1} based on the boson-fermion correspondence.
A study of computer-supported negotiation : Mode of communication, incentive scheme, and decision support tools
Creators: name: Chan, Yvonne Kin Wing
Publisher: name: University of British Columbia
Year: 2009

description: This paper examines the effects of mode of communication (computer-mediated versus face-to-face), incentive scheme (divisional versus mixed), and the availability of a decision support tool that calculates the optimal solutions on the outcome and process of negotiations. An experiment was conducted in which subjects were involved in two-person bilateral bargaining in a transfer pricing setting. Subjects played the role of either the Marketing Manager (the buyer division) or the Production Manager (the seller division); their task was to negotiate the transfer price and quantity of an intermediate commodity. Thirty-two negotiation dyads were randomly assigned to one of the experimental treatments so that there was an equal number of dyads in each condition. A negotiation support system (NSS) was used in all the experimental sessions. The system provides subjects with various decision support tools as well as an electronic linkage which allows the transmission of both textual and graphical information. Three main dependent variables were measured: (1) negotiation outcome, (2) communication and process variables, and (3) perception on communication efficiency and co-operation. Results showed that in the presence of an NSS, the difference in experimental treatments led to no differences on the negotiation outcome. More exchanges of remarks were found in the face-to-face condition but there was no evidence that the communication medium resulted in a more efficient and co-operative negotiation. A mixed-incentive scheme, however, was found to enhance communication efficiency and promote co-operative behaviour in negotiations.