cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Estimating Policy Functions in Payments Systems Using Reinforcement Learning
Creators: name: Castro, Pablo S.
name: Desai, Ajit
name: Du, Han
name: Garratt, Rodney
name: Rivadeneyra, Francisco
Publisher: name: Bank of Canada
Year: 2021

description: We demonstrate the ability of reinforcement learning techniques to estimate the best-response functions of banks participating in high-value payments systems—a real-world strategic game of incomplete information.

description: Nous montrons que les techniques d’apprentissage par renforcement permettent d’estimer les fonctions de réaction optimale des banques qui participent aux systèmes de paiement de grande valeur – un jeu stratégique du monde réel caractérisé par des informations incomplètes.
Lendle, Otto: Die Söldner des Kyros. Historischer Tatsachenroman
Creators: name: Neblung, Dagmar
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Lendle, Otto: Die Söldner des Kyros. Historischer Tatsachenroman. Darmstadt: Primus Verlag 1999. 359 S., 39,80 DM(ISBN3-89678-216-9).
description: Forum Classicum, Nr. 3 (1999): Forum Classicum
Dense Molecular Environments of B[e] Supergiants and Yellow Hypergiants
Creators: name: Kraus, Michaela
name: Kourniotis, Michalis
name: Arias, Maria Laura
name: Torres, Andrea F.
name: Nickeler, Dieter H.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedded in circumstellar shells and disks. We present K-band spectra of two B[e]SGs from the Large Magellanic Cloud and four Galactic YHGs. The CO band emission detected from the B[e]SGs LHA 120-S 12 and LHA 120-S 134 suggests that these stars are surrounded by stable rotating molecular rings. The spectra of the YHGs display a rather diverse appearance. The objects 6 Cas and V509 Cas lack any molecular features. The star [FMR2006] 15 displays blue-shifted CO bands in emission, which might be explained by a possible close to pole-on oriented bipolar outflow. In contrast, HD 179821 shows blue-shifted CO bands in absorption. While the star itself is too hot to form molecules in its outer atmosphere, we propose that it might have experienced a recent outburst. We speculate that we currently can only see the approaching part of the expelled matter because the star itself might still block the receding parts of a (possibly) expanding gas shell.
description: 23 pages, 6 figures, published in Galaxies
title: Γεωμετρικές ιδιότητες χώρων Banach σχετικές με την RNP (Radon-Nikodym ιδιότητα)
Creators: name: Δασκαλάκη Ερασμία
Publisher: name: Technical University of Crete
Year: 2009

description: 1. Βασικοί ορισμοί -- 2. Η CCP και superCCP ιδιότητα -- 3. Dunford-Pettis και γινόμενα Riesz
Treatment Orientation and Associated Characteristics of North American Academic Psychiatrists
Creators: name: Bodkin, J. Alexander
name: Klitzman, Robert L.
name: Pope Jr., Harrison G.
Publisher: name: Columbia University
Year: 1995
Subjects: Psychiatry
Psychiatrists
Psychiatrists--Attitudes

description: We present data showing the degree to which a “biological-psychotherapeutic” division persists in American psychiatry, and how psychiatrists' treatment orientation is associated with personal and professional characteristics. Almost two thirds of academic psychiatrists who responded to our survey (N = 435) could be classified as either biological (27%) or psychotherapeutic (37%) in orientation, according to the proportion of their caseload to which they provided psychotherapy (25% vs. ≥75%). There appears to have been an increase over the last 35 years in the proportion of psychiatrists who can be classified as biologically oriented and a decrease in the proportion who can be classified as psychotherapeutically oriented, as well as the emergence of a large class of intermediate or “eclectic” practitioners (36%). Several personal and professional attributes were distributed differentially according to treatment orientation. Psychotherapeutically oriented respondents more frequently reported personal histories of psychiatric disorders than did biologically oriented respondents (64% vs. 39%) as well as greater satisfaction with clinical work (81% vs. 53% “very satisfied”). Differences were also found in age, gender, history of personal psychotherapy, family history of psychiatric disorder, history of marijuana use, degrees of involvement in research, teaching and clinical care of patients, and overall work satisfaction, as well as other characteristics.
Some improved bounds in sampling discretization of integral norms
Creators: name: Dai, F.
name: Kosov, E.
name: Temlyakov, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Functional Analysis (math.FA)
subject: Numerical Analysis (math.NA)
subject: Classical Analysis and ODEs (math.CA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 42A05, 65D30, 41A63

description: The paper addresses a problem of sampling discretization of integral norms of elements of finite-dimensional subspaces satisfying some conditions. We prove sampling discretization results under a standard assumption formulated in terms of the Nikol'skii-type inequality. {In particular, we obtain} some upper bounds on the number of sample points sufficient for good discretization of the integral $L_p$ norms, $1\le p<2$, of functions from finite-dimensional subspaces of continuous functions. Our new results improve upon the known results in this direction. We use a new technique based on deep results of Talagrand from functional analysis.
description: 46 pages
Three-body bound states in atomic mixtures with resonant p-wave interaction
Creators: name: Efremov, Maxim A.
name: Plimak, Lev
name: Ivanov, Misha Yu.
name: Schleich, Wolfgang P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We employ the Born-Oppenheimer approximation to find the effective potential in a three-body system consisting of a light particle and two heavy ones when the heavy-light short-range interaction potential has a resonance corresponding to a non-zero orbital angular momentum. In the case of an exact resonance in the p-wave scattering amplitude, the effective potential is attractive and long-range, namely it decreases as the third power of the inter-atomic distance. Moreover, we show that the range and power of the potential, as well as the number of bound states are determined by the mass ratio of the particles and the parameters of the heavy-light short-range potential.
description: 5 pages, submitted to Phys. Rev. Lett
Probing the Mpc-scale environment of hyperluminous infrared galaxies at 2
Creators: name: Gao, F.
name: Wang, L.
name: Padilla, A. F. Ramos
name: Clements, D.
name: Farrah, D.
name: Huang, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Protoclusters are important for studying how halo mass and stellar mass assemble in the early universe. Finding signposts of such over-dense regions is a popular method to identify protocluster candidates. Hyperluminous infrared galaxies (HLIRGs), are expected to reside in overdense regions with massive halos. We study the Mpc-scale environment of the largest HLIRG sample to date and investigate whether they predominantly live in overdense regions. We first explore the surface density of Herschel 250 $μ$m sources around HLIRGs and compare with that around random positions. Then, we compare the spatial distribution of neighbours around HLIRGs with that around randomly selected galaxies using a deep IRAC-selected catalogue with good-quality photometric redshifts. We also use a redshift-matched quasar sample and submillimeter galaxy (SMG) sample to validate our method, as previous clustering studies have measured the host halo masses of these populations. Finally, we adopt a Friends of Friends (FOF) algorithm to seek (proto)clusters that host HLIRGs. We find that HLIRGs tend to have more bright star-forming neighbours (with 250 $μ$m flux density >10 mJy) within 100$\arcsec$ projected radius than a random galaxy at a 3.7$σ$ significance. In our 3D analysis, we find relatively weak excess of IRAC-selected sources within 3 Mpc around HLIRGs compared with random galaxy neighbours, mainly influenced by photometric redshift uncertainty and survey depth. We find a more significant difference (at a 4.7$σ$ significance) in the number of Low Frequency Array (LOFAR)-detected neighbours in the deepest EN1 field. HLIRGs at 3 < z < 4 show stronger excess compared to HLIRGs at 2 < z < 3, consistent with cosmic downsizing. Finally, we select and present a list of 30 most promising protocluster candidates for future follow-up observations.
description: 19 pages, 10 figures, accepted by A&A
Polarization effects in the Higgs boson decay to gamma Z and test of CP and CPT symmetries
Creators: name: Korchin, Alexander Yu.
name: Kovalchuk, Vladimir A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Polarization characteristics of gamma gamma and gamma Z states in the Higgs boson decays h -> gamma gamma and h -> gamma Z are discussed. Based on effective Lagrangian, describing h gamma gamma and h gamma Z interactions with CP-even and CP-odd parts, we calculate polarization parameters xi_1, xi_2, xi_3. A nonzero value of the photon circular polarization, defined by parameter xi_2, arises due to presence of both parts in effective Lagrangian and its non-Hermiticity. The circular polarization is proportional to the forward-backward asymmetry of fermions in the decay h -> gamma Z -> gamma f bar{f}. Measurement of this observable would allow one to search for deviation from the standard model and possible violation of CPT symmetry. We discuss also a possibility to measure parameters xi_1, xi_3, describing correlation of linear polarizations of photon and Z boson, in the decay h -> gamma* Z -> l+ l- Z via distribution over the azimuthal angle between the decay planes of gamma* -> l+ l- and Z -> f bar{f}. Deviation of the measured value of xi_1 from zero will indicate CP violation in the Higgs sector.
description: 9 pages, revtex4; v2: list of references is extended and updated, estimates of observability at the LHC of proposed processes are added, accepted for publication in Phys. Rev. D; v3: minor changes to adjust with the journal version
Convergence theorems for graph sequences
Creators: name: Pogorzelski, Felix
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: In this paper, we deal with a notion of Banach space-valued mappings defined on a set consisting of finite graphs with uniformly bounded vertex degree. These functions will be endowed with certain boundedness and additivity criteria. We examine their normalized long-term behaviour along a particular class of graph sequences. Using techniques developed by Elek, we show convergence in the topology of the Banach space if the corresponding graph sequence possesses a hyperfinite structure. These considerations extend and complement the corresponding results for amenable groups. As an application, we verify the uniform approximation of the integrated density of states for bounded, finite range operators on discrete structures. Further, we extend results concerning an abstract version of Fekete's Lemma for amenable groups and cancellative semigroups to the geometric situation of convergent graph sequences.
description: 13 pages, reference information included
The roles of family members, health care workers, and others in decision-making processes about genetic testing among individuals at risk for Huntington disease
Creators: name: Klitzman, Robert L.
name: Thorne, Deborah Z.
name: Williamson, Jennifer
name: Marder, Karen
Publisher: name: Columbia University
Year: 2007
Subjects: Human chromosome abnormalities--Diagnosis
Human chromosome abnormalities--Diagnosis--Social aspects
Decision making
Health--Decision making
Huntington's disease

description: Purpose: To understand how individuals at risk for Huntington disease view the roles of others, e.g., family members and health care workers, in decision making about genetic testing. Methods: Twenty-one individuals (eight mutation-positive, four mutation-negative, and nine not tested) were interviewed for approximately 2 hours each. Results: Interviewees illuminated several key aspects of the roles of family members and health care workers (in genetics and other fields) in decision making about testing that have been underexplored. Family members often felt strongly about whether an individual should get tested. Health care workers provided information and assistance with decision making and mental health referrals that were often helpful. Yet health care workers varied in knowledge and sensitivity regarding testing issues, and the quality of counseling and testing experiences can range widely. At times, health care workers without specialized knowledge of Huntington disease offered opinions of whether to test. Input from families and health care workers could also conflict with each other and with an individual's own preferences. Larger institutional and geographic contexts shaped decisions as well. Conclusion: Decision-making theories applied to Huntington disease testing have frequently drawn on psychological models, yet the current data highlight the importance of social contexts and relationships in testing decisions. This report, the first to our knowledge to explore individuals' perceptions of social factors (particularly family and health care worker involvement) in Huntington disease testing decisions, has critical implications for practice, education, research, and policy.
On the nature of cosmic strings in the brane world
Creators: name: Lin, Chia-Min
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate a static, cylindrically symmetric cosmic string on the brane without a perturbative approximation. We find there could be a (large) enhancement of the (effective) string tension when the energy density at the center of the string is (much) larger than twice the brane tension. We also point out a new way to evade the cosmic string problem when the energy density at the center of the string approaches twice the brane tension. These findings could have experimental and theoretical implications for searching for cosmic strings on the brane, in particular for cosmic strings generated after inflation (such as D-term inflation) on the brane.
description: 11 pages, 3 figures, the version to be published in the Chinese Journal of Physics
Colour gradients of low-redshift galaxies in the DESI Legacy Imaging Survey
Creators: name: Liao, Li-Wen
name: Cooper, Andrew
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Radial colour gradients within galaxies arise from gradients of stellar age, metallicity and dust reddening. Large samples of colour gradients from wide-area imaging surveys can complement smaller integral-field spectroscopy datasets and can be used to constrain galaxy formation models. Here we measure colour gradients for low-redshift galaxies (z<0.1) using photometry from the DESI Legacy Imaging Survey DR9. Our sample comprises ~93,000 galaxies with spectroscopic redshifts and ~574,000 galaxies with photometric redshifts. We focus on gradients across a radial range 0.5 Re to Re, which corresponds to the inner disk of typical late type systems at low redshift. This region has been the focus of previous statistical studies of colour gradients and has recently been explored by spectroscopic surveys such as MaNGA. We find the colour gradients of most galaxies in our sample are negative (redder towards the centre), consistent with the literature. We investigate empirical relationships between colour gradient, average $g-r$ and $r-z$ colour, $M_r$, $M_\star$, and sSFR. Trends of gradient strength with $M_r$ ($M_\star$) show an inflection around $M_r\sim-21$ ($\log_{10} \, M_\star/\mathrm{M_\odot}\sim10.5$). Below this mass, colour gradients become steeper with increasing $M_\star$, whereas colour gradients in more massive galaxies become shallower. We find that positive gradients (bluer stars at smaller radii) are typical for galaxies of $M_{\star}\sim10^{8}\,\mathrm{M_\odot}$. We compare our results to age and metallicity gradients in two datasets derived from fits of different stellar population libraries to MaNGA spectra, but find no clear consensus explanation for the trends we observe. Both MaNGA datasets seem to imply a significant contribution from dust reddening, in particular, to explain the flatness of colour gradients along the red sequence.
description: 26 pages, 26 figures, Submitted to MNRAS, data of ~93,000 galaxies with spectroscopic redshift and ~574,000 galaxies with photometric redshift is available at https://osf.io/q8x76/?view_only=3dc4faf80aae40e186ec358ad261d490
Horn, Christoph: Antike Lebenskunst. Glück und Moral von Sokrates bis zu den Neuplatonikern
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Horn, Christoph: Antike Lebenskunst. Glück und Moral von Sokrates bis zu den Neuplatonikern. München: Beck 1998. 271 S., 24,00 DM (Beck ’sche Reihe. 12171; ISBN 3-406-42071-0).
description: Forum Classicum, Nr. 3 (1999): Forum Classicum
Ups!... I did it again: unveiling the hidden companion in Upsilon Sagittarii, a unique binary system at a second mass transfer stage
Creators: name: Gilkis, Avishai
name: Shenar, Tomer
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Upsilon Sagittarii is a hydrogen-deficient binary that has been suggested to be in its second stage of mass transfer, after the primary has expanded to become a helium supergiant following core helium exhaustion. A tentative identification of the faint companion in the ultraviolet led to mass estimates of both components that made the helium star in Upsilon Sagittarii a prototypical immediate progenitor of a type Ib/c supernova. However, no consistent model for the complex spectrum has been achieved, casting doubt on this interpretation. In the present study we provide for the first time a composite spectral model that fits the ultraviolet data, and clearly identifies the companion as a rapidly rotating slowly moving ~7Msun B-type star, unlike previously suggested. The stripped helium supergiant is less luminous than previous estimates, and, with an estimated mass smaller than 1Msun, is ruled out as a core-collapse supernova progenitor. We provide a detailed binary evolution scenario that explains the temperature and luminosity of the two components as well as the very low gravity (log g ~ 1.0 [cm/s^2]) and extreme hydrogen deficiency of the primary (atmospheric mass fraction XH ~ 0.001). The best-fitting model is a ~5Msun intermediate-mass primary with an initial orbital period of a few days, and a secondary that appears to have gained a significant amount of mass despite its high rotation. We conclude that Upsilon Sagittarii is a key system for testing binary evolution processes, especially envelope stripping and mass accretion.
description: Accepted to MNRAS
title: Σύνθετα υλικά με ιπτάμενη τέφρα ως πληρωτικό υλικό και μήτρα πολυαιθυλένιου
Creators: name: Σπυρίδης Δημήτριος
Publisher: name: Technical University of Crete
Year: 2009

description:  Η ιπτάμενη τέφρα -- 2. Τα σύνθετα υλικά -- 3. Διεπιφάνεια μέσου ενίσχυσης-μήτρας -- 4. Ανάμειξη πρόσθετων σε πολυμερή -- 5. Το πολυαιθυλένιο -- 6. Πειραματική διαδικασία -- 7. Πειραματικά αποτελέσματα -- 8. Χρήση θεωρητικών μοντέλων για την κατανόηση ιδιοτήτων
Emergence of hierarchical modes from deep learning
Creators: name: Li, Chan
name: Huang, Haiping
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Large-scale deep neural networks consume expensive training costs, but the training results in less-interpretable weight matrices constructing the networks. Here, we propose a mode decomposition learning that can interpret the weight matrices as a hierarchy of latent modes. These modes are akin to patterns in physics studies of memory networks, but the least number of modes increases only logarithmically with the network width, and becomes even a constant when the width further grows. The mode decomposition learning not only saves a significant large amount of training costs, but also explains the network performance with the leading modes, displaying a striking piecewise power-law behavior. The modes specify a progressively compact latent space across the network hierarchy, making a more disentangled subspaces compared to standard training. Our mode decomposition learning is also studied in an analytic on-line learning setting, which reveals multi-stage of learning dynamics with a continuous specialization of hidden nodes. Therefore, the proposed mode decomposition learning points to a cheap and interpretable route towards the magical deep learning.
description: 5 pages +11 pages (SM), 4+10 figures, revised version to the journal
title: Σύγχρονη κατοίκηση στη Γαύδο -
Πρότυπες εγκαταστάσεις επέκτασης Οικισμού Βατσιανά

Creators: name: Αναστασακης Εμμανουηλ
Publisher: name: Technical University of Crete
Year: 2014

description: Η παρούσα διπλωματική εργασία βασίζεται στην έρευνα που έγινε για την κατοίκηση στο νησί της Γαύδου από την αρχαιότητα μέχρι σήμερα, δίνοντας έμφαση στα χαρακτηριστικά του παραδοσιακού Γαυγιώτικου σπιτιού και τις ανάγκες ενός μικρού οικισμού. Όπως διαπιστώθηκε από την ερευνητική εργασία η μορφή του Γαυγιώτικου σπιτιού παρέμεινε αναλλοίωτη στο χρόνο. Γι' αυτόν τον λόγο δύσκολα θα μπορούσαμε να καταφύγουμε σε μία ριζικά νέα μορφή – τουλάχιστον εξωτερικά. Έτσι επιλέχθηκαν οι εξής σχεδιαστικές αρχές.
Matter-Wave Interference versus Spontaneous Pattern Formation in Spinor Bose-Einstein Condensate
Creators: name: Witkowski, Marcin
name: Gartman, Rafal
name: Nagorny, Bartlomiej
name: Piotrowski, Marcin
name: Plodzien, Marcin
name: Sacha, Krzysztof
name: Szczepkowski, Jacek
name: Zachorowski, Jerzy
name: Zawada, Michal
name: Gawlik, Wojciech
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We describe effects of matter-wave interference of spinor states in the $^{87}$Rb Bose-Einstein condensate. The components of the F=2 manifold are populated by forced Majorana transitions and then fall freely due to gravity in an applied magnetic field. Weak inhomogeneities of the magnetic field, present in the experiment, impose relative velocities onto different $m_F$ components, which show up as interference patterns upon measurement of atomic density distributions with a Stern-Gerlach imaging method. We show that interference effects may appear in experiments even if gradients of the magnetic field components are eliminated but higher order inhomogeneity is present and the duration of the interaction is long enough. In particular, we show that the resulting matter-wave interference patterns can mimic spontaneous pattern formation in the quantum gas.
description: 5 pages, 4 figures, version accepted in Phys. Rev. A
Complex crater formation by oblique impacts on the Earth and Moon
Creators: name: Davison, T. M.
name: Collins, G. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Almost all meteorite impacts occur at oblique incidence angles, but the effect of impact angle on crater size is not well understood, especially for large craters. To improve oblique impact crater scaling, we present a suite of simulations of complex crater formation on Earth and the Moon over a range of impact angles, velocities and impactor sizes. We show that crater diameter is larger than predicted by existing scaling relationships for oblique impacts and for impacts steeper than 45$^{\circ}$ shows little dependence on obliquity. Crater depth, volume and diameter depend on impact angle in different ways such that relatively shallower craters are formed by more oblique impacts. Our simulation results have implications for how crater populations are determined from impactor populations and vice-versa. Our results suggest that existing approaches to account for impact obliquity may underestimate the number of craters larger than a given size by as much as 40%.
description: 15 pages, 3 figures, submitted to Geophysical Research Letters
How IRBs View and Make Decisions about Social Risks
Creators: name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 2013
Subjects: Research--Moral and ethical aspects
Medical ethics
Risk assessment--Social aspects
Institutional review boards (Medicine)

description: Whether and how irbs assess social risks remains unclear, with little empirical investigation. I contacted leaders of 60 IRBs, and interviewed IRB leaders from 34 (response rate = 55%) and additionally, 12 members and administrators. IRBs struggle to assess and balance social risks and benefits, and vary in whether, how, and how much to do so, and how to balance these against individual risks/benefits. Risks to a group affect individuals within it. Hence, social risks can include indirect individual risks, raising ambiguities. Dilemmas emerge: E.g., how much responsibility researchers and IRBs have for addressing broader health inequities. These data, the first to examine how IRBs make decisions about social risks, reveal how IRBs face critical challenges, dilemmas, and ambiguities.
Vortex Filament Equation for a Regular Polygon
Creators: name: de la Hoz, Francisco
name: Vega, Luis
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 35Q55, 11L05, 65M20, 28A80

description: In this paper, we study the evolution of the vortex filament equation (VFE), $$\mathbf X_t = \mathbf X_s \wedge \mathbf X_{ss},$$ with $\mathbf X(s, 0)$ being a regular planar polygon. Using algebraic techniques, supported by full numerical simulations, we give strong evidence that $\mathbf X(s, t)$ is also a polygon at any rational time; moreover, it can be fully characterized, up to a rigid movement, by a generalized quadratic Gauß sum. We also study the fractal behavior of $\mathbf X(0, t)$, relating it with the so-called Riemann's non-differentiable function, that was proved by Jaffard to be a multifractal.
description: 31 pages, 15 figures (27 pages in the final version of Nonlinearity)
Morphogenetic Design of Self-Organized Correlated Disordered Electromagnetic Media
Creators: name: Chehami, Fadhila
name: Decroze, Cyril
name: Pasquet, Thomas
name: Perrin, Emmanuel
name: Fromenteze, Thomas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The last decades witnessed the emergence of the field of correlated disordered media, a great challenge offering a large panel of new perspectives for applications in theoretical modelling and material fabrication. The efficient design of structures with a controlled level of spatial correlation is a central challenge in this field, in a context where existing techniques generally rely on gradient descent on non-convex functions and on the use of stochastic methods to explore vast design spaces more efficiently. In this work, we propose a new generative technique based on Alan Turing's morphogenesis theory for designing correlated disordered materials. Inspired by the structuring of living organisms, this technique relies on the definition of simple local interactions guiding the self-organization of a generated medium. The decentralization of design constraints and the elimination of cost function minimization make this approach natively scalable to the design of large domains with controlled levels of disorder. As a validation, the morphogenetic generation of stealthy hyperuniform disordered structures is exploited to reproduce an experiment of isotropic electromagnetic bandgap synthesis in the microwave range using a low refractive index contrast.
An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542
Creators: name: Grieves, Nolan
name: Bouchy, François
name: Ulmer-Moll, Solène
name: Gill, Samuel
name: Anderson, David R.
name: Psaridi, Angelica
name: Lendl, Monika
name: Stassun, Keivan G.
name: Jenkins, Jon M.
name: Burleigh, Matthew R.
name: Acton, Jack S.
name: Boyd, Patricia T.
name: Casewell, Sarah L.
name: Eigmüller, Philipp
name: Goad, Michael R.
name: Goeke, Robert F.
name: Günther, Maximilian N.
name: Hawthorn, Faith
name: Henderson, Beth A.
name: Henze, Christopher E.
name: Jordán, Andrés
name: Kendall, Alicia
name: Mishra, Lokesh
name: Moldovan, Dan
name: Moyano, Maximiliano
name: Osborn, Hugh
name: Revol, Alexandre
name: Sefako, Ramotholo R.
name: Tilbrook, Rosanna H.
name: Udry, Stéphane
name: Unger, Nicolas
name: Vines, Jose I.
name: West, Richard G.
name: Worters, Hannah L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the discovery of a 1.32$^{+0.10}_{-0.10}$ $\mathrm{M_{\rm Jup}}$ planet orbiting on a 75.12 day period around the G3V $10.8^{+2.1}_{-3.6}$ Gyr old star TOI-5542 (TIC 466206508; TYC 9086-1210-1). The planet was first detected by the Transiting Exoplanet Survey Satellite (TESS) as a single transit event in TESS Sector 13. A second transit was observed 376 days later in TESS Sector 27. The planetary nature of the object has been confirmed by ground-based spectroscopic and radial velocity observations from the CORALIE and HARPS spectrographs. A third transit event was detected by the ground-based facilities NGTS, EulerCam, and SAAO. We find the planet has a radius of 1.009$^{+0.036}_{-0.035}$ $\mathrm{R_{\rm Jup}}$ and an insolation of 9.6$^{+0.9}_{-0.8}$ $S_{\oplus}$, along with a circular orbit that most likely formed via disk migration or in situ formation, rather than high-eccentricity migration mechanisms. Our analysis of the HARPS spectra yields a host star metallicity of [Fe/H] = $-$0.21$\pm$0.08, which does not follow the traditional trend of high host star metallicity for giant planets and does not bolster studies suggesting a difference among low- and high-mass giant planet host star metallicities. Additionally, when analyzing a sample of 216 well-characterized giant planets, we find that both high masses (4 $\mathrm{M_{\rm Jup}}$ $$ 10 days) and hot (P $<$ 10 days) giant planets are preferentially located around metal-rich stars (mean [Fe/H] $>$ 0.1). TOI-5542b is one of the oldest known warm Jupiters and it is cool enough to be unaffected by inflation due to stellar incident flux, making it a valuable contribution in the context of planetary composition and formation studies.
description: 16 pages, 12 figures, Accepted by Astronomy & Astrophysics September 19, 2022
title: Trac(k)ing new timelines
Creators: name: Βλαχιωτης Ευσταθιος
Publisher: name: Technical University of Crete
Year: 2014

description: Η σημερινή εποχή αποτελεί μια περίοδο
γοργών εξελίξεων και ανακατατάξεων. Οι
εξελίξεις αυτές αποτελούν το προοίμιο της
μετάβασης της κοινωνίας μας στο επόμενο
οικονομικο- κοινωνικό σύστημα, την
επονομαζόμενη Πληροφοριακή εποχή. Η
αρχιτεκτονική ως επιστήμη, καλείται να
πάρει θέση σε αυτές τις εξελίξεις ώστε να
καλύψει τις χωρικές και ποιοτικές ανάγκες
του ολοένα διαπλασσόμενου ανθρώπου.
Καλείται να απαντήσει στα τρέχοντα
προβλήματα αλλά και να προβλέψει τις
επερχόμενες ανάγκες και δυνατότητες του
χώρου, στα πλαίσια μιας εξελισσόμενης
κοινωνίας. Η παρούσα ερευνητική εργασία,
στοχεύει στην -όσο το δυνατόν-
εμπεριστατωμένη πρόβλεψη των κοινωνικών
χαρακτηριστικών της επερχόμενης
Πληροφοριακής εποχής και στη σκιαγράφηση
των χωρικών της δυνατοτήτων και δομών.
Memory capacity of adaptive flow networks
Creators: name: Bhattacharyya, Komal
name: Zwicker, David
name: Alim, Karen
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Biological flow networks adapt their network morphology to optimise flow while being exposed to external stimuli from different spatial locations in their environment. These adaptive flow networks retain a memory of the stimulus location in the network morphology. Yet, what limits this memory and how many stimuli can be stored is unknown. Here, we study a numerical model of adaptive flow networks by applying multiple stimuli subsequently. We find strong memory signals for stimuli imprinted for a long time into young networks. Consequently, networks can store many stimuli for intermediate stimulus duration, which balance imprinting and ageing.
description: 7 pages, 4 figures, 9 pages of appendix
M. Valerius Martialis, Epigramme, lateinisch-deutsch, hrsg. und übers. von Paul Barié und Winfried Schindler
Creators: name: Burnikel, Walter
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: M. Valerius Martialis, Epigramme, lateinisch-deutsch, hrsg. und übers. von Paul Barié und Winfried Schindler, Düsseldorf/Zürich (Artemis & Winkler) 1999, Sammlg. Tusculum, 1552 S., DM 168,-; für Mitglieder der Wiss. Buchgesellschaft DM 144,-.
description: Forum Classicum, Nr. 3 (1999): Forum Classicum
Zur Linguistikausbildung im universitären Lateinstudium. Ergebnisse der Kommission „Sprachwissenschaft“ der Mommsen-Gesellschaft und des Deutschen Altphilologenverbandes
Creators: name: Maier, Friedrich
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 3 (1999): Forum Classicum
title: Ο ρόλος της αστικής πλατείας στην Ευρώπη: συνθετικές παράμετροι, διαπιστώσεις και προτάσεις
Creators: name: Τριποδακη Ιολη-Ειρηνη
Publisher: name: Technical University of Crete
Year: 2014

description: Σκοπός της παρούσας εργασίας είναι να αναδείξει τη σημασία της πλατείας για την πόλη και την κοινωνία αλλά και να καταλήξει σε συγκεκριμένα συμπεράσματα, που προκύπτουν μέσα από μια αναλυτική εξέταση 26 επιλεγμένων πλατειών, που κρίνονται εμβληματικές για την αστική τους λειτουργία και ρόλο
Time-dependent factorial cumulants in interacting nano-scale systems
Creators: name: Kambly, Dania
name: Flindt, Christian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss time-dependent factorial cumulants in interacting nano-scale systems. Recent theoretical work has shown that the full counting statistics of non-interacting electrons in a two-terminal conductor is always generalized binomial and the zeros of the generating function are consequently real and negative. However, as interactions are introduced in the transport, the zeros of the generating function may become complex. This has measurable consequences: With the zeros of the generating function moving away from the real-axis, the high-order factorial cumulants of the transport become oscillatory functions of time. Here we demonstrate this phenomenon on a model of charge transport through coherently coupled quantum dots attached to voltage-biased electrodes. Without interactions, the factorial cumulants are monotonic functions of the observation time. In contrast, as interactions are introduced, the factorial cumulants oscillate strongly as functions of time. We comment on possible measurements of oscillating factorial cumulants and outline several avenues for further investigations.
description: 11 pages, 7 figures, invited contribution to special issue on 'Quantum Transport beyond DC' in the Journal of Computational Electronics
title: Μελέτη της προσρόφησης καδμίου από λιγνίτη χαμηλής θερμογόνου δύναμης. Διερεύνηση της ενίσχυσης της προσροφητικής ικανότητας
Creators: name: Κατσουρακης Φωτιος
Publisher: name: Technical University of Crete
Year: 2015

description: Σκοπός της  παρούσας διπλωματικής εργασίας είναι η μελέτη της προσρόφησης καδμίου (Cd) από λιγνίτη χαμηλής ποιότητας καθώς και η σύγκριση της με την προσροφητική ικανότητα του ενεργού άνθρακα. Επίσης μελετήθηκε η ενίσχυση της προσροφητικής ικανότητας  του λιγνίτη και του ενεργού άνθρακα, με την προσθήκη νανοσωματιδίων σιδήρου στα οργανικά υλικά  χρησιμοποιώντας σαν πηγή σιδήρου τρισθενή χλωριούχο σίδηρο (FeCl3). Για τη μελέτη της ενίσχυσης της προσροφητικής ικανότητας του λιγνίτη (MT2) και του ενεργού άνθρακα (AC) παρασκευάστηκαν δύο προσροφητικά υλικά που αποτελούνται :
Α) Το πρώτο από λιγνίτη ΜΤ2 και νάνο-σωματίδια χλωριούχου σιδήρου (FeCl3)
B) To δεύτερο από ενεργό άνθρακα και νάνο-σωματίδια χλωριούχου σιδήρου
( FeCl3).

Μετά την παρασκευή των προϊόντων ακολούθησε ο χαρακτηρισμός τους και η διερεύνηση της προσροφητικής τους ικανότητας . Ο χαρακτηρισμός έγινε με ηλεκτρονική μικροσκοπία σάρωσης (SEM) και μέτρηση της ειδικής επιφάνειας με φυσική ρόφηση αερίου (BET). Η διερεύνηση της προσροφητικής ικανότητας του λιγνίτη και του ενεργού άνθρακα καθώς και των ενισχυμένων τελικών προϊόντων (ενεργός άνθρακας/σίδηρος και λιγνίτης/σίδηρος) πραγματοποιήθηκε με κινητικά πειράματα και πειράματα ισορροπίας (ισόθερμες). Τα πειραματικά δεδομένα των ισόθερμων συγκρίθηκαν με τα μοντέλα Freundlich και Langmuir στη γραμμικοποιημένη τους μορφή με σκοπό να ελεχθεί ποιο από τα δύο μοντέλα ανταποκρίνεται καλύτερα στα δικά μας πειραματικά δεδομένα.

Από τα κινητικά πειράματα προσρόφησης προκύπτει ότι επέρχεται ισορροπία και για τα 4 υλικά περίπου στις 12 ώρες. Σε κατάσταση ισορροπίας ο λιγνίτης παρουσιάζει ικανοποιητική προσροφητική ικανότητα της τάξεως των 15,5 mg καδμίου ανά γραμμάριο λιγνίτη, μικρότερη από την προσροφητική ικανότητα του ενεργού άνθρακα που είναι της τάξεως των 18,3 mg καδμίου ανά γραμμάριο ενεργού άνθρακα. H προσθήκη νανοσωματιδίων σιδήρου στα οργανικά υλικά αύξησε σημαντικά την προσροφητική τους ικανότητα έχοντας μάλιστα πιο δραστική επίδραση στην προσροφητική ικανότητα του λιγνίτη. Έτσι σε κατάσταση ισορροπίας το υλικό λιγνίτη / σιδήρου (ΜΤ2Fe) παρουσιάζει προσροφητική ικανότητα της τάξεως των 22,8 mg καδμίου ανά γραμμάριο MT2Fe οριακά μεγαλύτερη από την προσροφητική ικανότητα του ενεργού άνθρακα/ σιδήρου (ACFe) που είναι της τάξεως των 22,4 mg καδμίου ανά γραμμάριο ACFe.

Επίσης από τα πειράματα ισορροπίας προκύπτει ότι, το μέγιστο ποσοστό ρόφησης καδμίου παρατηρείται  για συγκέντρωση καδμίου 10 mg/L, όπου προσροφάται στο ΜΤ2 το 90,2%, στο ΑC το 91,5%, στο ΜΤ2Fe το 93,8% και στο ΑCFe το 92,8%. Η μέγιστη χωρητικότητα προσρόφησης των υλικών είναι για το ΜΤ2 25,5 mg/g, για τον ΑC 30 mg/g, για το MT2Fe 34,7 mg/g και για τον ΑCFe 36,5 mg/g για υδατικό διάλυμα καδμίου αρχικής συγκέντρωσης 1000ppm σε χρόνο 24 ώρες.
Gridless 3D Recovery of Image Sources from Room Impulse Responses
Creators: name: Sprunck, Tom
name: Privat, Yannick
name: Foy, Cédric
name: Deleforge, Antoine
Publisher: name: arXiv
Year: 2022
Subjects: subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: Signal Processing (eess.SP)
subject: Classical Physics (physics.class-ph)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: Given a sound field generated by a sparse distribution of impulse image sources, can the continuous 3D positions and amplitudes of these sources be recovered from discrete, bandlimited measurements of the field at a finite set of locations, e.g., a multichannel room impulse response? Borrowing from recent advances in super-resolution imaging, it is shown that this nonlinear, non-convex inverse problem can be efficiently relaxed into a convex linear inverse problem over the space of Radon measures in R3. The linear operator introduced here stems from the fundamental solution of the free-field inhomogenous wave equation combined with the receivers' responses. An adaptation of the Sliding Frank-Wolfe algorithm is proposed to numerically solve the problem off-the-grid, i.e., in continuous 3D space. Simulated experiments show that the approach achieves near-exact recovery of hundreds of image sources using an arbitrarily placed compact 32-channel spherical microphone array in random rectangular rooms. The impact of noise, sampling rate and array diameter on these results is also examined.
description: IEEE Signal Processing Letters, 2022
Critical-to-Insulator Transitions and Fractality Edges in Perturbed Flatbands
Creators: name: Lee, Sanghoon
name: Andreanov, Alexei
name: Flach, Sergej
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the effect of quasiperiodic perturbations on one-dimensional all-bands-flat lattice models. Such networks can be diagonalized by a finite sequence of local unitary transformations parameterized by angles $θ_i$. Without loss of generality, we focus on the case of two bands with bandgap $Δ$. Weak perturbations lead to an effective Hamiltonian with both on- and off-diagonal quasiperiodic terms that depend on $θ_i$. For some angle values, the effective model coincides with the extended Harper model. By varying the parameters of the quasiperiodic potentials, \iffalse and the manifold angles $θ_i$ \fi we observe localized insulating states and an entire parameter range hosting critical states with subdiffusive transport. For finite quasiperiodic potential strength, the critical-to-insulating transition becomes energy dependent with what we term fractality edges separating localized from critical states.
description: 10 pages, 6 figures, 1 table
Sorcery and science: responses to kuru and other epidemics
Creators: name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 1999
Subjects: Medicine and psychology
Epidemics
Epidemiology
Kuru

description: Over upcoming years, other epidemics will arise, as technology alters environments and human lives, linking formerly isolated regions ofthe world such that infectious agents harbored in one ecosystem can escape to others. New plagues will no doubt prompt fear, resistance, and denial, furthering the spread of disease, and inspiring desperate searches for answers and solutions, such as I saw in New Guinea. New Guineans dismissed myviews and I could dismiss theirs. But similarities remain.
Role of Filamentary Structures in the Formation of Two Dense Cores, L1544 and L694-2
Creators: name: Kim, Shinyoung
name: Lee, Chang Won
name: Tafalla, Mario
name: Gophinathan, Maheswar
name: Caselli, Paola
name: Myers, Philip C.
name: Chung, Eun Jung
name: Li, Shanghuo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present mapping results of two prestellar cores, L1544 and L694-2, embedded in filamentary clouds in C$^{18}$O (3-2), $^{13}$CO (3-2), $^{12}$CO (3-2), HCO$^+$ (4-3), and H$^{13}$CO$^+$ (4-3) with the JCMT telescope to examine the role of the filamentary structures in the formation of dense cores in the clouds, with new distance estimates for L1544 ($175_{-3}^{+4}$ pc) and L694-2 ($203_{-7}^{+6}$ pc). From these observations, we found that the non-thermal velocity dispersion of two prestellar cores and their surrounding clouds are smaller than or comparable to the sound speed. This may indicate that the turbulence has already been dissipated for both filaments and cores during their formation time. We also found a $λ/4$ shift between the periodic oscillations in the velocity and the column density distributions implying the possible presence of gravitational core-forming flow motion along the axis of the filament. The mass accretion rates due to these flow motions are estimated to be 2-3 M$_\odot$ Myr$^{-1}$, being comparable to that for Serpens cloud but much smaller than those for the Hub filaments, cluster, or high mass forming filaments by 1 or 2 order of magnitudes. From this study, we suggest that the filaments in our targets might be formed from the shock-compression of colliding clouds, and then the cores are formed by gravitational fragmentation of the filaments to evolve to the prestellar stage. We conclude that the filamentary structures in the clouds play an important role in the entire process of formation of dense cores and their evolution.
description: 30 pages, 22 figures, 6 tables, accepted for publication in ApJ
Chiral and nonreciprocal single-photon scattering in a chiral-giant-molecule waveguide-QED system
Creators: name: Zhou, Juan
name: Yin, Xian-Li
name: Liao, Jie-Qiao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study chiral and nonreciprocal single-photon scattering in a chiral-giant-molecule waveguide-QED system. Here, the giant molecule consists of two coupled giant atoms, which interact with two linear waveguides, forming a four-port quantum device. We obtain the exact analytical expressions of the four scattering amplitudes using a real-space method. Under the Markovian limit, we find that the single-photon scattering behavior is determined by the coupling strength between the giant atoms and the waveguides, the coupling strength between the two giant atoms, and the nondipole effect caused by the phase accumulation of photons travelling between the coupling points. It is also found that chiral and nonreciprocal single-photon scattering can be realized by introducing the chiral coupling to break the symmetry in the coupling configuration between the giant molecule and the waveguides. In addition, an ideal chiral emitter-waveguide coupling enables a directional single-photon routing. In the non-Markovian regime, the scattering spectra are characterized by more abundant structures with multiple peaks and dips. In particular, we demonstrate that the non-Markovian retarded effect can induce the nonreciprocal single-photon scattering. Our results have potential applications in the design of optical quantum devices involving giant atoms, which can provide an efficient platform for studying chiral quantum optics.
description: 13 pages,10 figures