cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-perturbative thermal flows and resummations
Creators: name: Litim, Daniel F.
name: Pawlowski, Jan M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct a functional renormalisation group for thermal fluctuations. Thermal resummations are naturally built in, and the infrared problem of thermal fluctuations is well under control. The viability of the approach is exemplified for thermal scalar field theories. In gauge theories the present setting allows for the construction of a gauge-invariant thermal renormalisation group.
description: 16 pages, eq (38) added to match published version
Stability of naked singularities and algebraically special modes
Creators: name: Cardoso, Vitor
name: Cavaglia, Marco
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that algebraically special modes lead to the instability of naked singularity spacetimes with negative mass. Four-dimensional negative-mass Schwarzschild and Schwarzschild-de Sitter spacetimes are unstable. Stability of the Schwarzschild-anti-de Sitter spacetime depends on boundary conditions. We briefly discuss the generalization of these results to charged and rotating singularities.
description: 6 pages. ReVTeX4. v2: Minor improvements and extended discussion on boundary conditions. Version to appear in Phys. Rev. D
Στις δύο όχθες του τρόμου: Άνθρωπος σε Πτώση του Don DeLillo και Τα χελιδόνια της Καμπούλ του Yasmina Khadra
Creators: name: Κορπίδου, Ιωάννα Σωφρονίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Λογοτεχνία της φονταμενταλιστικής τρομοκρατίας
Νέος ρεαλισμός
Μάρτυρες
Literature of fundamentalist terrorism
New realism
Witness/Martyr

description: Η παρούσα μεταπτυχιακή διατριβή μελετά τη διαφαινόμενη ανάδυση ενός νέου λογοτεχνικού ρεαλισμού στη σύγχρονη εποχή της φονταμενταλιστικής τρομοκρατίας, μέσα από το έργο δύο πολιτισμικά ανομοιογενών συγγραφέων – του αμερικανού Don DeLillo και του εκδοθέντος μετά το τρομοκρατικό χτύπημα της 11η Σεπτεμβρίου 2001 στη Νέα Υόρκη έργου του, Άνθρωπος σε Πτώση (2007, αγγλική έκδοση), και του γαλλόφωνου αλγερινού συγγραφέα Yasmina Khadra και του πρώτου έργου του στη θεματική της τρομοκρατίας στις χώρες της Μέσης Ανατολής, Τα Χελιδόνια της Καμπούλ (2004, ελληνική έκδοση). Η διατριβή εστιάζει, μέσα από την ανάλυση των κοινών στα δύο έργα μοτίβων του μάρτυρα – με την τριπλή σημασία του θύματος, του ομολογητή της πίστεως/θύτη και του θεατή/αφηγητή/αναγνώστη – και του αποξενωμένου επικοινωνιακά σχήματος των κεντρικών χαρακτήρων, στον τρόπο με τον οποίο οι δύο συγγραφείς καθιστούν οικεία και άρα διαχειρίσιμη τη νέα πραγματικότητα της συνεχώς επαπειλούμενης βίας και απώλειας στο σύγχρονο κόσμο, ανανεώνοντας συγχρόνως τις τεχνικές της αφήγησης και επενδύοντας ξανά τη λογοτεχνία με ένα ηθικό πρόταγμα
description: The present MA thesis examines the apparent emergence of a new literary realism in the current era of fundamentalist terrorism through the work of two culturally diverse writers, namely of the American writer Don DeLillo and his post 9/11 book entitled Falling Man (2007, English edition) and of the francophone Algerian writer Yasmina Khadra and his first book on the theme of terrorism in the middle-eastern countries The Swallows of Khabul (2004, Greek edition). The thesis focuses on the particular ways both authors render this new reality of constant threat of violence and loss familiar to the contemporary reader and therefore turn it into a manageable human experience. By analyzing their common motifs of the victim/martyr/witness and of the enstranged character pairs this project will show how the two authors reinvent the tropes of narration while re-investing literature with a moral imperative
HST NICMOS Imaging of the Planetary-mass Companion to the Young Brown Dwarf 2MASS J1207334-393254
Creators: name: Song, Inseok
name: Schneider, G.
name: Zuckerman, B.
name: Farihi, J.
name: Becklin, E. E.
name: Bessell, M. S.
name: Lowrance, P.
name: Macintosh, B. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Multi-band (0.9 to 1.6 um) images of the TW Hydrae Association (TWA) brown dwarf, 2MASS J1207334-393254 (also known as 2M1207), and its candidate planetary mass companion (2M1207b) were obtained on 2004 Aug 28 and 2005 Apr 26 with HST/NICMOS. The images from these two epochs unequivocally confirm the two objects as a common proper motion pair (16.0 sigma confidence). A new measurement of the proper motion of 2M1207 implies a distance to the system of 59+-7 pc and a projected separation of 46+-5 AU. The NICMOS and previously published VLT photometry of 2M1207b, extending overall from 0.9 to 3.8 um, are fully consistent with an object of a few Jupiter masses at the canonical age of a TWA member (~8 Myr) based on evolutionary models of young giant planets. These observations provide information on the physical nature of 2M1207b and unambiguously establish that the first direct image of a planetary mass companion in orbit around a self-luminous body, other than our Sun, has been secured.
description: 18 pages, 3 figures, 3 tables. Accepted in ApJ
Relative asymptotic behavior of pseudoholomorphic half-cylinders
Creators: name: Siefring, Richard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Symplectic Geometry (math.SG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 32Q65; 57R58

description: Withdrawn by author due to copyright transfer. See: http://www3.interscience.wiley.com/cgi-bin/abstract/116836954/ABSTRACT
description: Withdrawn by author due to copyright transfer. For final version, see author's webpage (http://math.msu.edu/~siefring/) or publisher's webpage (http://www3.interscience.wiley.com/journal/29240/home)
Computing the Discrete Fourier Transform of signals with spectral frequency support
Creators: name: Reddy, P Charantej
name: Tej, V S S Prabhu
name: Siripuram, Aditya
name: Osgood, Brad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We consider the problem of finding the Discrete Fourier Transform (DFT) of $N-$ length signals with known frequency support of size $k$. When $N$ is a power of 2 and the frequency support is a spectral set, we provide an $O(k \log k)$ algorithm to compute the DFT. Our algorithm uses some recent characterizations of spectral sets and is a generalization of the standard radix-2 algorithm.
description: 6 pages, 4 figures, submitted to 2021 IEEE International Symposium on Information Theory
Selection and Evaluation of The Supply Chain Partner In A Greek Company
Creators: name: Παπαθανασίου, Γρηγόριος Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Επιλογή Προμηθευτών
Διαχείριση Εφοδιαστικής Αλυσίδας
Πλαίσιο εξωτερικής ανάθεσης
Suppliers’ selection
Supply Chain Management
Outsourcing Framework

description: H επιλογή προμηθευτών είναι η διαδικασία μέσω της οποίας, οι εταιρείες προσδιορίζουν, αξιολογούν και τελικά να διαπραγματευτούν τους συμβατικούς όρους με τους προμηθευτές τους. H διαδικασία επιλογής των προμηθευτών απαιτεί σίγουρα ένα σημαντικό ποσό των οικονομικών και άλλων πόρων της επιχείρησης. Σε αντάλλαγμα, οι εταιρείες περιμένουν να αποκτήσουν σημαντικά οφέλη από τη σύναψη συμβάσεων με τους προμηθευτές. Επιπλέον, η αγορά γίνεται στρατηγικά σημαντική για τη συνολική απόδοση της επιχείρησης, μέσω της υλοποίησης συγκεκριμένων επιτυχημένων πρακτικών. Η εργασία αυτή εστιάζεται κυρίως να διερευνήσει διεξοδικά, το πλαίσιο διαγωνισμού για την επιλογή των πιθανών προμηθευτών. Οι στόχοι για να επιτευχθεί είναι η περιγραφή της διαδικασίας υποβολής προσφορών, σύμφωνα με τη διεθνή βιβλιογραφία. Επιπλέον, η εφαρμογή του πλαισίου αυτού σε μια υπάρχουσα ελληνική εταιρεία «XYZ Α.Ε.» Επίσης, περιγράφει τα τυπικά στάδια των διαδικασιών επιλογής του προμηθευτή: τον εντοπισμό των προμηθευτών, την προσέλκυση των πληροφοριών από τους προμηθευτές, τους όρους της σύμβασης, τη διαπραγμάτευση με τους προμηθευτές, και την αξιολόγηση των προμηθευτών. Στο τελευταίο κεφάλαιο, αναφέρονται τα αποτελέσματα που προέρχόνται από την παραπάνω διαδικασία και προτάσεις για περαιτέρω έρευνα
description: Suppliers’ selection is the process through which, companies identify, evaluate, and eventually negotiate the contractual terms with their suppliers. The suppliers’ selection process certainly requires a significant amount of a firm’s financial and other resources. In return, companies expect to acquire significant benefits from contracting with suppliers, offering high value. Furthermore, purchasing becomes strategically important to the overall business performance, through the implementation of specific purchasing practices. This thesis is mainly focused to investigate thoroughly, the bidding framework for the selection of potential suppliers. The objectives are set here, to achieve the main goal, which is the description of the bidding procedure in accordance to the international bibliography. Furthermore, the implementation of this framework to an existing Greek company “XYZ SA” for the selection. The thesis also describes the typical steps of supplier selection processes: identifying suppliers, soliciting information from suppliers, setting contract terms, negotiating with suppliers, and evaluating suppliers. In the final chapter, a discussion is originated from the results proposing further research
Theory and Phenomenology of Neutrino Mixing
Creators: name: Giunti, Carlo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review some fundamental aspects of the theory of neutrino masses and mixing. The results of neutrino oscillation experiments are interpreted as evidence of three-neutrino mixing. Implications for the mixing parameters and the neutrino masses are discussed, with emphasis on the connection with the measurements of the absolute values of neutrino masses in beta decay and neutrinoless double-beta decay experiments and cosmological observations.
description: 16 pages; talks presented at Tau06 (19-22 September 2006, Pisa, Italy) and HQL06 (16-20 October 2006, Munich, Germany)
Complexity Conjecture of Regular Electric Black Holes
Creators: name: Asl, B. Bahrami
name: Hendi, S. H.
name: Sajadi, S. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, the action growth rate of a variety of four-dimensional regular magnetic black holes in F frame is obtained in [1]. Here, we study the action growth rate of a four-dimensional regular electric black hole in P frame that is the Legendre transformation of F frame. We also investigate the action growth rates of the Wheeler-De Witt patch for such black hole configurations at the late time and examine the Lloyd bound on the rate of quantum computation. We show that although the form of the Lloyd bound formula remains unaltered, the energy modifies due to a non-vanishing trace of the energy-momentum tensor and some extra terms may appear in the total growth action. We also investigate the asymptotic behavior of complexity in two conjectures for static and rotating regular black holes.
description: 26 pages, 13 figures
Global m=1 instabilities and lopsidedness in disc galaxies
Creators: name: Dury, Vanessa
name: De Rijcke, S.
name: Debattista, Victor P.
name: Dejonghe, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Lopsidedness is common in spiral galaxies. Often, there is no obvious external cause, such as an interaction with a nearby galaxy, for such features. Alternatively, the lopsidedness may have an internal cause, such as a dynamical instability. In order to explore this idea, we have developed a computer code that searches for self-consistent perturbations in razor-thin disc galaxies and performed a thorough mode-analysis of a suite of dynamical models for disc galaxies embedded in an inert dark-matter halo with varying amounts of rotation and radial anisotropy. Models with two equal-mass counter-rotating discs and fully rotating models both show growing lopsided modes. For the counter-rotating models, this is the well-known counter-rotating instability, becoming weaker as the net rotation increases. The m=1 mode of the maximally rotating models, on the other hand, becomes stronger with increasing net rotation. This rotating m=1 mode is reminiscent of the eccentricity instability in near-Keplerian discs. To unravel the physical origin of these two different m=1 instabilities, we studied the individual stellar orbits in the perturbed potential and found that the presence of the perturbation gives rise to a very rich orbital behaviour. In the linear regime, both instabilities are supported by aligned loop orbits. In the non-linear regime, other orbit families exist that can help support the modes. In terms of density waves, the counter-rotating m=1 mode is due to a purely growing Jeans-type instability. The rotating m=1 mode, on the other hand, grows as a result of the swing amplifier working inside the resonance cavity that extends from the disc center out to the radius where non-rotating waves are stabilized by the model's outwardly rising Q-profile.
description: 12 pages, 14 figures
Imipenem/Cilastatin/Relebactam: A Review in Gram-Negative Bacterial Infections
Creators: name: Young-A Heo
Publisher: name: Adis Journals
Year: 2021
Subjects: Medicine

description: Funding The preparation of this review was not supported by any external funding. Authorship and Conflict of interest Young-A Heo is a salaried employee of Adis International Ltd/Springer Nature, and declares no relevant conflicts of interest. All authors contributed to the review and are responsible for the article content. Ethics approval, Consent to participate, Consent to publish, Availability of data and material, Code availability not applicable Additional information about this Adis Drug Review can be found here AbstractImipenem/cilastatin/relebactam (Recarbrio™) is an intravenously administered combination of the carbapenem imipenem, the renal dehydropeptidase-I inhibitor cilastatin, and the novel β-lactamase inhibitor relebactam. Relebactam is a potent inhibitor of class A and class C β-lactamases, conferring imipenem activity against many imipenem-nonsusceptible strains. Imipenem/cilastatin/relebactam is approved in the USA and EU for the treatment of hospital-acquired bacterial pneumonia (HABP) and ventilator-associated bacterial pneumonia (VABP) in adults and other gram-negative infections, including complicated urinary tract infections (cUTIs) [including pyelonephritis] and complicated intra-abdominal infections (cIAIs), in adults with limited or no alternative treatment options. In pivotal phase II and III trials, imipenem/cilastatin/relebactam was noninferior to piperacillin/tazobactam in patients with HABP/VABP and to imipenem/cilastatin in patients with cUTIs and cIAIs. It was also effective in imipenem-nonsusceptible infections. Imipenem/cilastatin/relebactam was generally well tolerated, with a safety profile consistent with that of imipenem/cilastatin. Available evidence indicates that imipenem/cilastatin/relebactam is an effective and generally well tolerated option for gram-negative infections in adults, including critically ill and/or high-risk patients, and a potential therapy for infections caused by carbapenem-resistant pathogens.
Thermodynamic properties of a charged particle in non-uniform magnetic field
Creators: name: Sedehi, H. R. Rastegar
name: Arda, Altug
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We solve the Schrödinger equation for a charged particle in the non-uniform magnetic field by using the Nikiforov-Uvarov method. We find the energy spectrum and the wave function, and present an explicit relation for the partition function. We give analytical expressions for the thermodynamic properties such as mean energy and magnetic susceptibility, and analyze the entropy, free energy and specific heat of this system numerically. It is concluded that the specific heat and magnetic susceptibility increase with external magnetic field strength and different values of the non-uniformity parameter, $α$, in the low temperature region, while the mentioned quantities are decreased in high temperature regions due to increasing the occupied levels at these regions. The non-uniformity parameter has the same effect with a constant value of the magnetic field on the behavior of thermodynamic properties. On the other hand, the results show that transition from positive to negative magnetic susceptibility depends on the values of non-uniformity parameter in the constant external magnetic field.
description: 22 pages, 7 figures
A Novel HOC-Immersed Interface Approach For Elliptic Problems
Creators: name: Singhal, Raghav
name: Kalita, Jiten C
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present a new higher-order accurate finite difference explicit jump Immersed Interface Method (HEJIIM) for solving two-dimensional elliptic problems with singular source and discontinuous coefficients in the irregular region on a compact Cartesian mesh. We propose a new strategy for discretizing the solution at irregular points on a nine point compact stencil such that the higher-order compactness is maintained throughout the whole computational domain. The scheme is employed to solve four problems embedded with circular and star shaped interfaces in a rectangular region having analytical solutions and varied discontinuities across the interface in source and the coefficient terms. We also simulate a plethora of fluid flow problems past bluff bodies in complex flow situations, which are governed by the Navier-Stokes equations; they include problems involving multiple bodies immersed in the flow as well. In the process, we show the superiority of the proposed strategy over the EJIIM and other existing IIM methods by establishing the rate of convergence and grid independence of the computed solutions. In all the cases our computed results extremely close to the available numerical and experimental results.
Explicit Cosmological Coarse Graining via Spatial Averaging
Creators: name: Paranjape, Aseem
name: Singh, T. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The present matter density of the Universe, while highly inhomogeneous on small scales, displays approximate homogeneity on large scales. We propose that whereas it is justified to use the Friedmann-Lemaitre-Robertson-Walker (FLRW) line element (which describes an exactly homogeneous and isotropic universe) as a template to construct luminosity distances in order to compare observations with theory, the evolution of the scale factor in such a construction must be governed not by the standard Einstein equations for the FLRW metric, but by the modified Friedmann equations derived by Buchert [7, 8] in the context of spatial averaging in Cosmology. Furthermore, we argue that this scale factor, defined in the spatially averaged cosmology, will correspond to the effective FLRW metric provided the size of the averaging domain coincides with the scale at which cosmological homogeneity arises. This allows us, in principle, to compare predictions of a spatially averaged cosmology with observations, in the standard manner, for instance by computing the luminosity distance versus red-shift relation. The predictions of the spatially averaged cosmology would in general differ from standard FLRW cosmology, because the scale-factor now obeys the modified FLRW equations. This could help determine, by comparing with observations, whether or not cosmological inhomogeneities are an alternative explanation for the observed cosmic acceleration.
description: 18 pages, 2 figures; (v2) added references, (v3) material and references added, (v4) material and references added, some clarifying remarks added, to appear in Gen. Rel. Grav
An experimental study of the effects of partial saturation on elastic wave velocities in porous rocks
Creators: name: Goertz, David
Publisher: name: University of British Columbia
Year: 2009

description: Elastic wave velocities in porous rocks containing air and water are sensitive to not • only the relative levels of fluid saturation but also to the distribution of the fluids within the pore space. Three factors that have significant control over-the relative distributions of fluids in multiphase saturated porous media are pore space microgeometry, saturation history and wettability. In this thesis, the effect of these factors on the form of dependence of velocities upon water saturation level in rocks is investigated experimentally. Ultrasonic elastic wave velocity and drying rate measurements were made as a function of water saturation in a limestone, a dolomite and two sandstone samples as saturation was reduced through evaporative drying. During the later stages of drying there is a reduction in drying rate that is associated with the transition from capillary transport to diffusive transport due to a loss of hydraulic connectivity of the liquid phase. For the rocks used in this study, this suggests that velocity variations below this point can be associated with the removal of disconnected water held in surface roughness and in crack-like porosity. Using these interpretations and simplified models of the pore spaces derived from thin section analysis, fluid distribution scenarios are proposed for the drying process in these rocks. A numerical modeling routine is then used to predict the form of the velocity saturation relationships for the rocks. The models were found to be in good agreement with the form of the experimental results. The effect of wettability on the relationship between velocities and saturation history was investigated in the sandstone samples by conducting imbibition and drainage experiments before and after treatment with a chemical that altered their surfaces from being strongly water-wet to being oil-wet. In the water-wet sandstones, the results indicate that grain contact regions are the last to drain of water and the first to fill with water. At high saturation levels, hysteresis is evident and is attributed to differences in the pore scale distribution of fluids that evolves in pore bodies during the imbibition and drainage processes. The results for the oil-wet samples during evaporative drying were found to be similar to those for the water-wet rocks: water was replaced by air first in the pore bodies and then in the grain contacts and cracks. In contrast, imbibition produced results that are consistent with water entering the pore bodies first and being excluded from the cracks and grain contacts until high saturation levels.
Modulation of charge-density waves by superlattice structures
Creators: name: Malvezzi, Andre L
name: Paiva, Thereza
name: Santos, Raimundo R dos
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We discuss the interplay between electronic correlations and an underlying superlattice structure in determining the period of charge density waves (CDW's), by considering a one-dimensional Hubbard model with a repeated (non-random) pattern of repulsive (U>0) and free (U=0) sites. Density matrix renormalization group diagonalization of finite systems (up to 120 sites) is used to calculate the charge-density correlation function and structure factor in the ground state. The modulation period can still be predicted through effective Fermi wavevectors, k_F*, and densities, and we have found that it is much more sensitive to electron (or hole) doping, both because of the narrow range of densities needed to go from q*=0 to π, but also due to sharp 2k_F*-4k_F* transitions; these features render CDW's more versatile for actual applications in heterostructures than in homogeneous systems.
description: 4 pages, 5 figures, to appear in Phys Rev B
Subspace Confinement: How good is your qubit?
Creators: name: Devitt, Simon J.
name: Schirmer, Sonia G.
name: Oi, Daniel K. L.
name: Cole, Jared H.
name: Hollenberg, Lloyd C. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The basic operating element of standard quantum computation is the qubit, an isolated two-level system that can be accurately controlled, initialized and measured. However, the majority of proposed physical architectures for quantum computation are built from systems that contain much more complicated Hilbert space structures. Hence, defining a qubit requires the identification of an appropriate controllable two-dimensional sub-system. This prompts the obvious question of how well a qubit, thus defined, is confined to this subspace, and whether we can experimentally quantify the potential leakage into to states outside the qubit subspace. In this paper we demonstrate that subspace leakage can be quantitatively characterized using minimal theoretical assumptions by examining the Fourier spectrum of the Rabi oscillation experiment.
description: 13 pages, 11 figures, accepted for publication in New Journal of Physics
Jacobians in isogeny classes of abelian surfaces over finite fields
Creators: name: Howe, Everett W.
name: Nart, Enric
name: Ritzenthaler, Christophe
Publisher: name: arXiv
Year: 2006
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G20 (Primary) 14G10, 14G15 (Secondary)

description: We give a complete answer to the question of which polynomials occur as the characteristic polynomials of Frobenius for genus-2 curves over finite fields.
description: LaTeX, 38 pages. Intermediate results in Section 13 have been generalized. Minor changes elsewhere
X-ray Super-Flares From Pre-Main Sequence Stars: Flare Modeling
Creators: name: Getman, Konstantin V.
name: Feigelson, Eric D.
name: Garmire, Gordon P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Getman et al. (2021) reports the discovery, energetics, frequencies, and effects on environs of $>1000$ X-ray super-flares with X-ray energies $E_X \sim 10^{34}-10^{38}$~erg from pre-main sequence (PMS) stars identified in the $Chandra$ MYStIX and SFiNCs surveys. Here we perform detailed plasma evolution modeling of $55$ bright MYStIX/SFiNCs super-flares from these events. They constitute a large sample of the most powerful stellar flares analyzed in a uniform fashion. They are compared with published X-ray super-flares from young stars in the Orion Nebula Cluster, older active stars, and the Sun. Several results emerge. First, the properties of PMS X-ray super-flares are independent of the presence or absence of protoplanetary disks inferred from infrared photometry, supporting the solar-type model of PMS flaring magnetic loops with both footpoints anchored in the stellar surface. Second, most PMS super-flares resemble solar long duration events (LDEs) that are associated with coronal mass ejections. Slow rise PMS super-flares are an interesting exception. Third, strong correlations of super-flare peak emission measure and plasma temperature with the stellar mass are similar to established correlations for the PMS X-ray emission composed of numerous smaller flares. Fourth, a new correlation of loop geometry is linked to stellar mass; more massive stars appear to have thicker flaring loops. Finally, the slope of a long-standing relationship between the X-ray luminosity and magnetic flux of various solar-stellar magnetic elements appears steeper in PMS super-flares than for solar events.
description: 30 pages, 11 figures, 2 tables. Accepted for publication in The Astrophysical Journal, July 2021
title: The impact of social pretend play on preschoolers’ social development: Results of an experimental study
Creators: name: Jaggy, Ann-Kathrin
name: Kalkusch, Isabelle
name: Burkhardt Bossi, Carine
name: Weiss, Barbara
name: Sticca, Fabio
name: Perren, Sonja
Publisher: name: Publikationsserver der Pädagogischen Hochschule Thurgau
Year: 2023
Subjects: Social pretend play
Social competence
Emotional skills
Social skills

description: This controlled intervention study with a pre-test, post-test, and follow-up design investigated whether promoting children's social pretend play quality fosters their social development. Twenty-seven Swiss playgroups (N = 211 children, age: M = 43.3 months, SD= 6.5, with a median of 7 children per group) were randomly assigned to one of three experimental conditions: Play tutoring, provision of role play material, or control. Standardized tests and educator questionnaires were used to assess children's social pretend play competence and social-cognitive, emotional and social skills as well as their peer relationship quality. Latent change models indicated that children's social pretend play competence, behavioral skills, and positive peer relationships as reported by their educators increased most strongly for children in the play tutoring condition. No significant intervention effects emerged regarding children's social-cognitive or emotional skills. The results show that actively promoting children's social pretend play quality also fosters their social behavior and peer relationships.
description: Early Childhood Research Quarterly, vol. 64, p. 13
Facilitating Asynchronous Participatory Design of Open Source Software: Bringing End Users into the Loop
Creators: name: Hellman, Jazlyn
name: Cheng, Jinghui
name: Guo, Jin L. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: As open source software (OSS) becomes increasingly mature and popular, there are significant challenges with properly accounting for usability concerns for the diverse end users. Participatory design, where multiple stakeholders collaborate on iterating the design, can be an efficient way to address the usability concerns for OSS projects. However, barriers such as a code-centric mindset and insufficient tool support often prevent OSS teams from effectively including end users in participatory design methods. This paper proposes preliminary contributions to this problem through the user-centered exploration of (1) a set of design guidelines that capture the needs of OSS participatory design tools, (2) two personas that represent the characteristics of OSS designers and end users, and (3) a low-fidelity prototype tool for end user involvement in OSS projects. This work paves the road for future studies about tool design that would eventually help improve OSS usability.
description: 7 pages, 3 figures, CHI 2021 Extended Abstracts
Investigating star formation in the young open cluster NGC 6383
Creators: name: Paunzen, E.
name: Netopil, M.
name: Zwintz, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: By studying young open clusters, the mechanisms important for star formation over several Myr can be examined. For example, accretion rate as a function of rotational velocity can be investigated. Similarly, sequential star formation triggered by massive stars with high mass-loss rates can be studied in detail. We identified and characterized probable members of NGC 6383, as well as determined cluster parameters. New Stromgren uvby CCD photometry, obtained by us, is presented. This new data, together with Johnson UBV and 2MASS data in the NIR, was used to investigate characteristics of pre- as well as zero age main sequence cluster members. We present Stromgren uvby CCD photometry for 272 stars in the field of NGC 6383 and derive its reddening, E(b-y)=0.21(4)mag, as well as distance, d=1.7(3)kpc from the Sun. Several stars with NIR excess and objects in the domain of the classical Herbig Ae/Be and T Tauri stars were detected. Two previously known variables were identified as rapidly-rotating PMS stars. The field population is clearly separated from the probable members in the color-magnitude diagram. NGC 6383 is a young open cluster, with an age of less than 4 Myr, undergoing continuous star formation. True pre-main sequence members might be found down to absolute magnitudes of +6mag, with a variety of rotational velocities and stellar activities.
description: 7 pages, 6 figures, accepted by A&A
Ανάλυση πληροφοριακού περιεχομένου έντυπων διαφημίσεων φαρμακευτικών και παραφαρμακευτικών προϊόντων
Creators: name: Αριστείδου, Αλεξάνδρα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: ανάλυση περιεχομένου
πληροφοριακά στοιχεία-φάρμακα
δημιουργικές στρατηγικές
εκτελεστικά στυλ
φαρμακευτικό μάρκετινγκ
συμπληρώματα διατροφής
δερμοκαλλυντικά
έντυπες διαφημίσεις
content analysis
information cues-drugs
creative strategies
executional styles
pharmaceutical marketing
supplements
cosmetics
print advertisements

description: Σκοπός αυτής της διπλωματικής είναι να ερευνήσει και να αναλύσει το πληροφοριακό περιεχόμενο στις έντυπες διαφημίσεις των φαρμακευτικών προϊόντων. Η έρευνα είναι σημαντική επειδή η βιβλιογραφία σχετικά με τα πληροφοριακά στοιχεία στο περιεχόμενο των διαφημίσεων εγείρει βαθιά ζητήματα σχετικά με τις θεμελιώδεις λειτουργίες της διαφήμισης των φαρμάκων, των δερμοκαλλυντικών και των συμπληρωμάτων διατροφής. Τρεις υποθέσεις διατυπώθηκαν για την συγκεκριμένη έρευνα. Τα αποτελέσματα παρουσιάζουν ότι οι διαφημίσεις των φαρμάκων τείνουν να είναι περισσότερο πληροφοριακές από ότι αυτές των δερμοκαλλυντικών και ότι οι μάρκες με υψηλή αναγνωρισιμότητα και ποιότητα περιλαμβάνουν περισσότερα πληροφοριακά στοιχεία στις διαφημίσεις τους. Επιπλέον, η έρευνα έδειξε ότι οι διαφημίσεις των συμπληρωμάτων διατροφής εμφανίζουν να έχουν περισσότερες πληροφορίες σχετικά με τα συστατικά τους από ότι οι διαφημίσεις των φαρμάκων. Τέλος, οι συγκριτικές διαφημίσεις αφορούσαν κυρίως διαφημίσεις συμπληρωμάτων διατροφής και δερμοκαλλυντικών
description: The purpose of this thesis is to investigate and analyze information content in the print advertising of pharmaceutical products. This research is important because the literature about information content of advertising raised profound issues about the fundamental functions of advertising drugs, cosmetics and supplements. Three hypotheses were derived. The findings depict that advertisements of drugs tend to be more informative than cosmetics and brands with higher levels of brand familiarity and quality, include more information cues in their advertisements. Furthermore, the research showed that supplement’s advertisements appear more information cues about the components than drugs do. Finally, comparative advertisements mostly concern advertisements of supplements and cosmetics
Asymmetric Field Photovoltaic Effect of Neutral Atoms
Creators: name: Lai, Wenxi
name: Niu, Jinyan
name: Ma, Yu-Quan
name: Liu, W. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Photovoltaic effect of neutral atoms using inhomogeneous light in double-trap opened system is studied theoretically. Using asymmetric external driving field to replacing original asymmetric chemical potential of atoms, we create polarization of atom population in the double-trap system. The polarization of atom number distribution induces net current of atoms and works as collected carriers in the cell. The cell can work even under partially coherent light. The whole configuration is described by quantum master equation considering weak tunneling between the system and its reservoirs at finite temperature. The model of neutral atoms could be extended to more general quantum particles in principle.
description: 8 pages, 4 figures
Constructing the Leptonic Unitarity Triangle
Creators: name: Ahuja, Gulsheen
name: Gupta, Manmohan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Following analogy of the `db' triangle in the quark mixing case, we have explored the construction of the `ν_2.ν_3' leptonic unitarity triangle using the Maki-Nakagawa-Sakata matrix obtained by Bjorken {\it et al.} through generalization of the tribimaximal scenario. In particular, for the U_{e3} range 0.05-0.15, the existence of the leptonic unitarity triangle indicates a fairly good possibility of having non zero CP violation.
description: 8 pages, 2 figures
Online Mobile App Usage as an Indicator of Sleep Behavior and Job Performance
Creators: name: Park, Chunjong
name: Arian, Morelle
name: Liu, Xin
name: Sasson, Leon
name: Kahn, Jeffrey
name: Patel, Shwetak
name: Mariakakis, Alex
name: Althoff, Tim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computers and Society (cs.CY)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Sleep is critical to human function, mediating factors like memory, mood, energy, and alertness; therefore, it is commonly conjectured that a good night's sleep is important for job performance. However, both real-world sleep behavior and job performance are hard to measure at scale. In this work, we show that people's everyday interactions with online mobile apps can reveal insights into their job performance in real-world contexts. We present an observational study in which we objectively tracked the sleep behavior and job performance of salespeople (N = 15) and athletes (N = 19) for 18 months, using a mattress sensor and online mobile app. We first demonstrate that cumulative sleep measures are correlated with job performance metrics, showing that an hour of daily sleep loss for a week was associated with a 9.0% and 9.5% reduction in performance of salespeople and athletes, respectively. We then examine the utility of online app interaction time as a passively collectible and scalable performance indicator. We show that app interaction time is correlated with the performance of the athletes, but not the salespeople. To support that our app-based performance indicator captures meaningful variation in psychomotor function and is robust against potential confounds, we conducted a second study to evaluate the relationship between sleep behavior and app interaction time in a cohort of 274 participants. Using a generalized additive model to control for per-participant random effects, we demonstrate that participants who lost one hour of daily sleep for a week exhibited 5.0% slower app interaction times. We also find that app interaction time exhibits meaningful chronobiologically consistent correlations with sleep history, time awake, and circadian rhythms. Our findings reveal an opportunity for online app developers to generate new insights regarding cognition and productivity.
Johari-Goldstein heterogeneous dynamics in a model polymer
Creators: name: Puosi, Francesco
name: Tripodo, Antonio
name: Malvaldi, Marco
name: Leporini, Dino
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The heterogeneous character of the Johari-Goldstein (JG) relaxation is evidenced by molecular-dynamics simulation of a model polymer system. A double-peaked evolution of dynamic heterogeneity (DH), with maxima located at JG and structural relaxation time scales, is observed and mechanistically explained. {The short-time single-particle displacement during JG relaxation weakly correlates with the long-time one observed during structural relaxation}.
Confirmation of the binary status of Cha Halpha 2 - a very young low-mass binary in Chamaeleon
Creators: name: Schmidt, T. O. B.
name: Neuhäuser, R.
name: Vogt, N.
name: Seifahrt, A.
name: Roell, T.
name: Bedalov, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Neuhaeuser & Comeron (1998, 1999) presented direct imaging evidence, as well as first spectra, of several young stellar and sub-stellar M6- to M8-type objects in the Cha I dark cloud. One of these objects is Cha Halpha 2, classified as brown dwarf candidate in several publications and suggested as possible binary in Neuhaeuser et al. (2002). We have searched around Cha Halpha 2 for close and faint companions with adaptive optics imaging. Two epochs of direct imaging data were taken with the Very Large Telescope (VLT) Adaptive Optics instrument NACO in February 2006 and March 2007 in Ks-band. We retrieved an earlier image from 2005 from the European Southern Observatory (ESO) Science Archive Facility, increasing the available time coverage. After confirmation of common proper motion, we deduce physical parameters of the objects by spectroscopy, like temperature and mass. We find Cha Halpha 2 to be a very close binary of ~0.16 arcsec separation, having a flux ratio of ~0.91, thus having almost equal brightness and indistinguishable spectral types within the errors. We show that the two tentative components of Cha Halpha 2 form a common proper motion pair, and that neither component is a non-moving background object. We even find evidence for orbital motion. A combined spectrum of both stars spanning optical and near-infrared parts of the spectral energy distribution yields a temperature of 3000+/-100 K, corresponding to a spectral type of M6+/-1 and a surface gravity of log g= 4.0 +0.75-0.5, both from a comparison with GAIA model atmospheres. We derive masses of ~0.110 Msun (>0.070 Msun) and ~0.124 Msun (>0.077 Msun) for the two components of Cha Halpha 2, i.e., probably low-mass stars, but one component could possibly be a brown dwarf.
description: 6 pages, 8 figures, accepted for publication in A&A
On P_T-distribution of gluon production rate in constant chromoelectric field
Creators: name: Pak, D. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A complete expression for the p_T-distribution of the gluon production rate in the homogeneous chromoelectric field has been obtained. Our result contains a new additional term proportional to the singular function δ(p_T^2). We demonstrate that the presence of this term is consistent with the dual symmetry of QCD effective action and allows to reproduce the known result for the total imaginary part of the effective action after integration over transverse momentum.
description: 4 pages, no figures, minor corrections, one reference added
Stochastic Gravitational Wave Background from Light Cosmic Strings
Creators: name: DePies, Matthew R.
name: Hogan, Craig J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Spectra of the stochastic gravitational wave backgrounds from cosmic strings are calculated and compared with present and future experimental limits. Background spectra are calculated numerically for dimensionless string tensions G mu/c^2 between 10^{-7} and 10^{-18}, and initial loop sizes as a fraction of the Hubble radius, alpha, from 0.1 to 10^{-6}. The spectra of the cosmic string backgrounds are compared with current millisecond pulsar limits and LISA sensitivity curves. For models with large stable loops (alpha=0.1), current pulsar-timing limits exclude G mu/c^2>10^{-9} and within the range of current models based on brane inflation. LISA may detect a background from strings as light as G mu/c^2 10^{-16}, corresponding to field-theory strings formed at roughly 10^{11} GeV.
description: 14 pgs, 7 fig, small text addition and reference added, accepted by Phys. Rev. D
Target Policy-making Under the Frame of Dark Networks: Strengths, Weaknesses, and Opportunities
Creators: name: Shaheen, Joseph
Publisher: name: figshare
Year: 2021
Subjects: subject: 160510 Public Policy
subject: FOS: Political science
subject: 160206 Private Policing and Security Services
subject: FOS: Law

description: The Intelligence community utilizes Social Network Analysis (SNA) as an analytical tool-of-choice in many aspects of its investigation into criminal, terrorist, and foreign adversarial networks. The topical domain of Dark Networks attempts to frame the concepts and methodologies of SNA with classical decision science to formulate a collection of policies used by U.S. federal and state entities. However, scant evidence exists that the formulation of Dark Networks offers little more than classical SNA to begin with. In this session, we will discuss various ways by which we can enhance policymaking by strengthening the framework in ways classical SNA has yet to adopt, mainly through an information-theoretic approach. We will discuss current weaknesses and opportunities for developing the topic, especially in using agent-based simulations. The session will be relevant to scholars focused on political science, SNA, and computational social science in general.
Our Welfare at The Time of Covid-19: Early Empirical Assessment for Ethiopia
Creators: name: Habtewold, Tsegaye Mulugeta
name: Habtewold, Tsegaye Mulugeta
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Demand and Price Analysis
subject: Food Security and Poverty
subject: Health Economics and Policy
subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: Risk and Uncertainty
subject: Welfare
subject: COVID-19
subject: food security
subject: employment
subject: Ethiopia.

description: Current evidences reveal that COVID-19 will have nontrivial consequences on the global economies. A balanced intervention is expected from policymakers of strong restriction versus the economic and social impacts of the intervention. The main objective here is to quantify the impacts of COVID-19 on welfare through employed propensity score matching and endogenous switching regression methods and using the World Bank high-frequency phone call data in Ethiopia. The results showed that COVID-19 adversely affected all outcomes used here and the impacts vary disproportionally by different household groups. As of now, however, there are no clear indicators that show how these impacts could vary in future. As the pandemic is in its early stage, the condition calls more researches to be conducted with wider datasets that can fully capture the potential and long-term impacts of the pandemic. Finally, this study also sheds light on the effects that COVID-19 has on general welfare in the short-run