cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A correspondence between the multifractal model of turbulence and the Navier-Stokes equations
Creators: name: Dubrulle, B.
name: Gibbon, J. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study a correspondence between the multifractal model of turbulence and the Navier-Stokes equations in $d$ spatial dimensions by comparing their respective dissipation length scales. In Kolmogorov's 1941 theory the key parameter $h$, which is an exponent in the Navier-Stokes invariance scaling, is fixed at $h=1/3$ but is allowed a spectrum of values in multifractal theory. Taking into account all derivatives of the Navier-Stokes equations, it is found that for this correspondence to hold the multifractal spectrum $C(h)$ must be bounded from below such that $C(h) \geq 1-3h$, which is consistent with the four-fifths law. Moreover, $h$ must also be bounded from below such that $h \geq (1-d)/3$. When $d=3$ the allowed range of $h$ is given by $h \geq -2/3$ thereby bounding $h$ away from $h=-1$. The implications of this are discussed.
description: 9 pages, 1 figure
Η συναισθησία και η αισθητηριακή αντίληψη της εικόνας, ήχου, μουσικής και κίνησης.
Creators: name: Ντερόπουλος, Παναγιώτης Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πολυαισθητηριακή αντίληψη
Συναισθησία
Κιναισθησία
Multi sensory perception
Synesthesia
Kinesthesia

description: Η παρούσα εργασία διερευνά την αντίληψη του χρώματος, του ήχου και της κίνησης και της συσχέτισης που δημιουργεί ο συνδυασμός των παραπάνω στις αισθήσεις και στις αντιλήψεις του ατόμου. Οι αντιλήψεις της εικόνας του ήχου και της κίνησης μέσω των αισθήσεων διαφοροποιούνται από άτομο σε άτομα και ειδικότερα στους συναισθητικούς ανθρώπους. Ο πρωταρχικός σκοπός είναι να έρθουμε σε επαφή με το φαινόμενο της συναισθησίας και να διερευνήσουμε τους τύπους, τα χαρακτηριστικά και της μορφές που το φαινόμενο λαμβάνει στα άτομα που βιώνουν συναισθητικές καταστάσεις. Η συναισθησία και η πολυαισθητηριακή αντίληψη είναι ένα φαινόμενο που απασχολεί αρκετούς τομείς όπως τη ιατρική, την ψυχολογία, την τέχνη και την επιστήμη γενικότερα. Επιπλέον, σε ένα δεύτερο βήμα παρουσιάζεται και αναλύεται το φαινόμενο της κιναισθησίας που αναφέρεται στην αντίληψη του χώρου, ή αλλιώς της αίσθησης μέσω της κίνησης. Είναι επίσης γνωστό πως, οι τεχνολογικές εξελίξεις και η ανάπτυξη της πληροφορικής επέτρεψε την ανάπτυξη πολυμεσικών εφαρμογών, οι οποίες συμβάλουν στην πολυαισθητηριακή αντίληψη του ατόμου. Ως εκ τούτου, στα πλαίσια της διερεύνησης της συναισθητικής και της κιναισθητικής αντίληψης εξετάζεται η χρήση της τεχνολογίας και πως αυτή συνδέεται με τα δυο αυτά φαινόμενα και τις θεωρήσεις που έχουν αναπτυχθεί γύρω από αυτά.
description: Current thesis explores the perception of color, sound and motion and the correlation by the combination of the above in the senses and perceptions of the individual. The perceptions of the image of sound and movement through the senses are differentiated from person to person and especially to synaesthetics. The primary purpose of thesis is presentation of synesthesia and the exploration of the synesthesia’s types, characteristics and forms. Synesthesia and multisensory perception is a phenomenon that involves several areas such as medicine, psychology, art, and science in general. Secondly, we present and analyze the phenomenon of kinesthesia, is the term referring to the perception of space, or sense of movement through movement. It is also known that technological developments and the development of IT enabled the development of multimedia applications that contribute to the multisensory perception of the individual. Therefore, in the context of the exploration of sensory and kinesthetic perception, was examined the use of technology related with synesthesia and investigate the different theories about them.
On the gap between an empirical distribution and an exponential distribution of waiting times for price changes in a financial market
Creators: name: Sazuka, Naoya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We analyze waiting times for price changes in a foreign currency exchange rate. Recent empirical studies of high frequency financial data support that trades in financial markets do not follow a Poisson process and the waiting times between trades are not exponentially distributed. Here we show that our data is well approximated by a Weibull distribution rather than an exponential distribution in a non-asymptotic regime. Moreover, we quantitatively evaluate how much an empirical data is far from an exponential distribution using a Weibull fit. Finally, we discuss a phase transition between a Weibull-law and a power-law in the asymptotic long waiting time regime.
description: 9 pages, 6 figures, submitted for a publication and under review
Ομαδοποίηση δεδομένων διαφημίσεων εργασίας από το StackOverflow
Creators: name: Αθανασάκογλου, Δημήτρης Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Επιχειρηματική Ευφυία
Ομαδοποίηση Δεδομένων
Ιεραρχικός Αλγόριθμος
Business Intelligence
Data Clustering
Hierarchical Algorithm

description: Μια από τις σημαντικότερες διεργασίες οι οποία λαμβάνει χώρα σε κάθε επιχείρηση είναι ο τρόπος και η διαδικασία λήψης των αποφάσεων. Η επιχειρηματική ευφυία και η μηχανική μάθηση αποτελούν εργαλεία τα οποία δίνουν την δυνατότητα στα διοικητικά στελέχη των επιχειρήσεων να αυτοματοποιήσουν την διαδικασία αυτή και να τεκμηριώσουν τις αποφάσεις οι οποίες πρέπει να ληφθούν στο εργασιακό περιβάλλον. Ένα από τα εργαλεία της μηχανικής μάθησης είναι και η ομαδοποίηση δεδομένων η οποία έχει ως στόχο την δημιουργία ομάδων μέσα από σύνολα δεδομένων. Σκοπός της παρούσας πτυχιακής εργασίας είναι η ομαδοποίηση δεδομένων διαφημίσεων εργασίας από την ενότητα «Developer Jobs» του StackOverflow και η εξαγωγή συσχετίσεων ανάμεσα στις διάφορες τεχνολογίες οι οποίες ζητούνται θα απασχολήσουν τον τομέα της πληροφορικής και των επικοινωνιών στο μέλλον. Επιπλέον η εργασία στοχεύει στη δημιουργία μιας web based εφαρμογής η οποία θα δίνει τη δυνατότητα στο χρήστη να υλοποιεί τις τεχνικές ομαδοποίησης οι οποίες περιγράφονται στην εργασία μαζί με όλες τις παραδοσιακές στατιστικές μεθοδολογίες. Για την επίτευξη του στόχου αυτού χρησιμοποιούνται εργαλεία όπως η στατιστική γλώσσα προγραμματισμού R και το πακέτο Shiny. Οι μεθοδολογίες ομαδοποίησης οι οποίες εφαρμόζονται επεκτείνονται από τον Ιεραρχικό αλγόριθμο μέχρι και τα πιθανολογικά μοντέλα. Επίσης γίνεται χρήση της ανάλυσης αντιστοιχιών για την εξαγωγή των συσχετίσεων.
description: The decision-making process is a vital process for the modern company. Business intelligence and machine learning tools enable business executives to automate this process and document decisions that need to be made in the work environment. Clustering is a machine learning tool that aims to find groups within a given dataset. The purpose of this dissertation is to cluster data from StackOverflow’s «Developer Jobs» section, in order to find correlations between the different technologies that are required and will dominate the IT and communications industry in future. In addition, the project aims at creating a web-based application that will enables the user to implement all the above clustering methods as well as other traditional statistical methodologies. To achieve this goal, tools such as the R programming language and the shiny package are used. The clustering methods that are applied extend from the hierarchical algorithm to complex probabilistic models. Correspondence analysis is also used in order to detect correlations between the different technologies.
Locating current sheets in the solar corona
Creators: name: Buechner, Joerg
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Current sheets are essential for energy dissipation in the solar corona, in particular by enabling magnetic reconnection. Unfortunately, sufficiently thin current sheets cannot be resolved observationally and the theory of their formation is an unresolved issue as well. We consider two predictors of coronal current concentrations, both based on geometrical or even topological properties of a force free coronal magnetic field. First, there are separatrices related to magnetic nulls. Through separatrices the magnetic connectivity changes discontinuously. Coronal magnetic nulls are, however, very rare. At second, inspired by the concept of generalized magnetic reconnection without nulls, quasi-separatrix layers (QSL) were suggested. Through QSL the magnetic connectivity changes continuously, though strongly. The strength of the connectivity change can be quantified by measuring the squashing of the flux tubes which connect the magnetically conjugated photospheres. We verify the QSL and separatrix concepts by comparing the sites of magnetic nulls and enhanced squashing with the location of current concentrations in the corona. Due to the known difficulties of their direct observation we simulated the coronal current sheets by numerically calculating the response of the corona to energy input from the photosphere heating a simultaneously observed EUV Bright Point. We did not find coronal current sheets not at the separatrices but at several QSL locations. The reason is that although the geometrical properties of force free extrapolated magnetic fields can indeed, hint at possible current concentrations, a necessary condition for current sheet formation is the local energy input into the corona.
Mimicking Kerr's multipole moments
Creators: name: Bonga, Béatrice
name: Yang, Huan
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Multipole moments carry a lot of information about the gravitational field. Nonetheless, knowing all the multipole moments of an object does not determine conclusively the nature of the object itself. In particular, the multipole moments of the Kerr spacetime are not unique. Here we construct several physically motivated Newtonian objects with multipole moments identical to those of Kerr. Moreover, we also provide a description of how to include post-Newtonian corrections to these objects without changing their multipole moments.
description: 8 pages, 3 figures; updated to match the published version (includes an extended introduction and discussion)
Helium observations of exoplanet atmospheres are connected to stellar coronal abundances
Creators: name: Poppenhaeger, Katja
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence
Exoplanet atmospheres
Stellar coronae
Stellar EUV emission

description: Transit observations in the helium lines near 10830 Angstrom are a new successful tool to study exoplanetary atmospheres and their mass loss. Forming those lines requires ionization and recombination of helium in the exoplanetary atmosphere. This ionization is caused by stellar photons in the extreme UV (EUV); however, no currently active telescopes can observe this part of the stellar spectrum. The stellar spectrum close to the helium ionization threshold consists of individual emission lines, many of which are formed by iron at coronal temperatures. Coronal elemental abundances exhibit distinct patterns related to the first ionization potential (FIP) of those elements, with elements like iron being strongly depleted for high-activity low-mass stars. I show that stars with high versus low coronal iron abundances follow different scaling laws that tie together their X-ray emission and the EUV flux close to the helium ionization threshold. I also show that the currently observed large scatter in the relationship of EUV irradiation with exoplanetary helium transit depths can be reduced by taking coronal iron abundances into account, allowing us to target exoplanets with well-observable helium signatures with much higher confidence.
description: {"references": ["Wood et al. (2018), The Astrophysical Journal, Volume 862, Issue 1, article id. 66, arXiv:1806.05111", "Oklopcic and Hirata (2018), The Astrophysical Journal Letters, Volume 855, Issue 1, article id. L11, arXiv:1711.05269", "Spake et al. (2018), Nature, Volume 557, Issue 7703, p.68-70, arXiv:1805.01298"]}
A Rare Upper Airway Obstruction by Large Hemorrhagic Vocal Polyps
Creators: name: Jarinratn Sirirattanapan, Suprapol Chantapan
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2015
Subjects: vocal polyps, pedunculated vocal polyps, hemorrhagic vocal polyps, stridor, airway compromise, tracheostomy.

description: 1, 22, Journal of Medicine and Health Sciences
Chaotic Emission from Electromagnetic Systems Considering Self-Interaction
Creators: name: Kokubun, Fernando
name: Zanchin, Vilson T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The emission of electromagnetic waves from a system described by the Hénon-Heiles potential is studied in this work. The main aim being to analyze the behavior of the system when the damping term is included explicitly into the equations of motion. Energy losses at the chaotic regime and at the regular regime are compared. The results obtained here are similar to the case of gravitational waves emission, as long we consider only the energy loss. The main difference being that in the present work the energy emitted is explicitly calculated solving the equation of motion without further approximations. It is expected that the present analysis may be useful when studying the analogous problem of dissipation in gravitational systems.
description: Typos in Refs. corrected. Other minor changes
Tools for fully automated volumetric measurement of cerebral atrophy from MRI ready for routine clinical practice in diagnosing Alzheimer's disease
Creators: name: Monton Wongwandee
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2015
Subjects: Volumetric magnetic resonance imaging, Alzheimer's disease, Hippocampal atrophy

description: 1, 22, Journal of Medicine and Health Sciences
Good and Proper: Self-similarity of N-body Simulations with Proper Force Softening
Creators: name: Garrison, Lehman H.
name: Joyce, Michael
name: Eisenstein, Daniel J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Analysis of self-similarity in scale-free $N$-body simulations reveals the spatial and temporal scales for which statistics measured in cosmological simulations are converged to the physical continuum limit. We examine how the range of scales in which the two-point correlation function is converged depends on the force softening length and whether it is held constant in comoving or proper coordinates. We find that a proper softening that reaches roughly 1/30th of the inter-particle spacing by the end of the simulation resolves the same spatial and temporal scales as a comoving softening of the same length while using a third fewer time steps, for a range of scale factors typical to $Λ$CDM simulations. We additionally infer an inherent resolution limit, set by the particle mass and scaling as $a^{-1/2}$, beyond which reducing the softening does not improve the resolution. We postulate a mapping of these results with spectral index $n=-2$ to $Λ$CDM simulations.
description: 14 pages, 12 figures. Minor changes to match accepted version. Comments welcome!
Additional file 3 of Analysis of initial laboratory diagnosis of malaria and its accuracy compared with re-testing from 2013 to 2018 in Yunnan Province, China
Creators: name: Dong, Ying
name: Deng, Yan
name: Xu, Yanchun
name: Chen, Mengni
name: Wei, Chun
name: Zhang, Canglin
name: Mao, Xianghua
name: Xue, Jingbo
Publisher: name: figshare
Year: 2020
Subjects: subject: Physical Sciences not elsewhere classified
subject: Medicine
subject: Environmental Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 3. Accuracy of initial malaria diagnoses in Yunnan Province prefectures (2013 to 2018).
Spin-valley phase diagram of the two-dimensional metal-insulator transition
Creators: name: Gunawan, O.
name: Gokmen, T.
name: Vakili, K.
name: Padmanabhan, M.
name: De Poortere, E. P.
name: Shayegan, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using symmetry breaking strain to tune the valley occupation of a two-dimensional (2D) electron system in an AlAs quantum well, together with an applied in-plane magnetic field to tune the spin polarization, we independently control the system's valley and spin degrees of freedom and map out a spin-valley phase diagram for the 2D metal-insulator transition. The insulating phase occurs in the quadrant where the system is both spin- and valley-polarized. This observation establishes the equivalent roles of spin and valley degrees of freedom in the 2D metal-insulator transition.
description: 4 pages, 2 figures
Escape from supercooling with or without bubbles: gravitational wave signatures
Creators: name: Lewicki, Marek
name: Pujolàs, Oriol
name: Vaskonen, Ville
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quasi-conformal models are an appealing scenario that can offer naturally a strongly supercooled phase transition and a period of thermal inflation in the early Universe. A crucial aspect for the viability of these models is how the Universe escapes from the supercooled state. One possibility is that thermal inflation phase ends by nucleation and percolation of true vacuum bubbles. This route is not, however, always efficient. In such case another escape mechanism, based on the growth of quantum fluctuations of the scalar field that eventually destabilize the false vacuum, becomes relevant. We study both of these cases in detail in a simple yet representative model. We determine the duration of the thermal inflation, the curvature power spectrum generated for the scales that exit horizon during the thermal inflation, and the stochastic gravitational wave background from the phase transition. We show that these gravitational waves provide an observable signal from the thermal inflation in almost the entire parameter space of interest. Furthermore, the shape of the gravitational wave spectrum can be used to ascertain how the Universe escaped from supercooling.
description: 11 pages, 6 figures. published version
Torsion theories for finite von Neumann algebras
Creators: name: Vas, Lia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Rings and Algebras (math.RA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 16W99, 46L99, 16S90, 19K99

description: The study of modules over a finite von Neumann algebra ${\mathcal A}$ can be advanced by the use of torsion theories. In this work, some torsion theories for ${\mathcal A}$ are presented, compared and studied. In particular, we prove that the torsion theory $(\mathrm{\bf T},\mathrm{\bf P})$ (in which a module is torsion if it is zero-dimensional) is equal to both Lambek and Goldie torsion theories for ${\mathcal A}$. Using torsion theories, we describe the injective envelope of a finitely generated projective ${\mathcal A}$-module and the inverse of the isomorphism $K_0({\mathcal A})\to K_0({\mathcal U}),$ where ${\mathcal U}$ is the algebra of affiliated operators of ${\mathcal A}.$ Then, the formula for computing the capacity of a finitely generated module is obtained. Lastly, we study the behavior of the torsion and torsion-free classes when passing from a subalgebra ${\mathcal B}$ of a finite von Neumann algebra ${\mathcal A}$ to ${\mathcal A}$. With these results, we prove that the capacity is invariant under the induction of a ${\mathcal B}$-module.
Encouraging Persons with Coronary Artery Disease to Adhere to Therapeutic Recommendations: Collaboration among Members in a Multidisciplinary Team
Creators: name: Juntima Rerkluenrit
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2015
Subjects: adhere to therapeutic recommendations, persons with coronary artery disease, multidisciplinary team

description: 1, 22, Journal of Medicine and Health Sciences
Comparing energy loss and $p_{\perp}$-broadening in perturbative QCD with strong coupling $\mathcal{N}=4$ SYM theory
Creators: name: Dominguez, Fabio
name: Marquet, C.
name: Mueller, A. H.
name: Wu, Bin
name: Xiao, Bo-Wen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compare medium induced energy loss and $p_{\perp}$-broadening in perturbative QCD with that of the trailing string picture of SYM theory. We consider finite and infinite extent matter as well as relativistic heavy quarks which correspond to those being produced in the medium or external to it. When expressed in terms of the appropriate saturation momentum, we find identical parametric forms for energy loss in perturbative QCD and SYM theory. We find simple correspondences between $p_{\perp}$-broadening in QCD and in SYM theory although $p_{\perp}$-broadening is radiation dominated in SYM theory and multiple scattering dominated in perturbative QCD.
description: 34 pages, 3 figures. More discussion and reference have been added
Nosocomial infection
Creators: name: Nitaya Indrawattana, Muthita Vanaporn
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2015
Subjects: Nosocomial infection, Pseudomonas aeruginosa, Klebsiella spp., Acinetobacter baumannii, Methicillin resistant Staphylococcus aureus, Enterococci

description: 1, 22, Journal of Medicine and Health Sciences
Cosmological Structure Formation Creates Large-Scale Magnetic Fields
Creators: name: Siegel, E. R.
name: Fry, J. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper examines the generation of seed magnetic fields due to the growth of cosmological perturbations. In the radiation era, different rates of scattering from photons induce local differences in the ion and electron density and velocity fields. The currents due to the relative motion of these fluids generate magnetic fields on all cosmological scales, peaking at a magnitude of ~ 10^{-24} Gauss at the epoch of recombination. Magnetic fields generated in this manner provide a promising candidate for the seeds of magnetic fields presently observed on galactic and extra-galactic scales.
description: 9 pages, 3 figures, important error corrected: with the correction, overall field strengths are 10^{-24} Gauss, discussion of other works in the literature expanded, and references added
Additional file 1 of “Help Us!”: a content analysis of COVID-19 help-seeking posts on Weibo during the first lockdown
Creators: name: Guo, Yu
name: Hou, Yongkang
name: Xiang, Hongzhe
name: Chen, Liang
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Virology

description: Additional file 1. Table for manually filtered criteria.
~20 yr of stellar activity for M stars
Creators: name: Ibañez Bustos, R. V.
name: Buccino, A. P.
name: Mauas, P. J. D.
Publisher: name: Zenodo
Year: 2021
Subjects: low-mass stars
late-type stars
stellar activity

description: M dwarf stars are prime targets in current and upcoming exoplanet surveys, due to their ubiquity in the
 solar neighborhood and the high occurrence of small exoplanets in their habitable zones. However, their
 magnetic activity could hinder the detection of orbiting planets and also seriously contrains the
 habitability of the terrestrial planets.
 During the last decade, new debates about the mechanism responsible for the magnetic activity of M stars
 have emerged in the dynamo theory. Information on the long-term activity of partially and fully
 convective M stars would allow us to understand whether their underlying dynamo is responsible for the
 detected activity cycles.
 Since 1999, the HKα Project is operating in the Argentinian observatory CASLEO (Complejo
 Astronómico El Leoncito), exclusively dedicated to observe a set of F3V to M5.5V stars. To date, our
 database presents more than 6000 mid-resolution spectra with a wavelength range from 389 to 669 nm,
 which constitutes an ideal dataset to study long-term activity.
 In the present work, we show the first evidence of activity cycles for a fully convective M
 stars, Gl 729, obtained from reliabale time series of 20 year length.
The strength and structure of the magnetic field in the galactic outflow of M82
Creators: name: Lopez-Rodriguez, Enrique
name: Guerra, Jordan
name: Asgari-Targhi, Mahboubeh
name: Schmelz, Joan T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galactic outflows driven by starbursts can modify the galactic magnetic fields and drive them away from the galactic planes. Here, we quantify how these fields may magnetize the intergalactic medium. We estimate the strength and structure of the fields in the starburst galaxy M82 using thermal polarized emission observations from SOFIA/HAWC+ and a potential field extrapolation commonly used in solar physics. We modified the Davis-Chandrasekhar-Fermi method to account for the large-scale flow and the turbulent field. Results show that the observed magnetic fields arise from the combination of a large-scale ordered potential field associated with the outflow and a small-scale turbulent field associated with bow-shock-like features. Within the central $900$ pc radius, the large-scale field accounts for $53\pm4$% of the observed turbulent magnetic energy with a median field strength of $305\pm15$ $μ$G, while small-scale turbulent magnetic fields account for the remaining $40\pm5$% with a median field strength of $222\pm19$ $μ$G. We estimate that the turbulent kinetic and turbulent magnetic energies are in close equipartition up to $\sim2$ kpc (measured), while the turbulent kinetic energy dominates at $\sim7$ kpc (extrapolated). We conclude that the fields are frozen into the ionized outflowing medium and driven away kinetically. The magnetic field lines in the galactic wind of M82 are `open,' providing a direct channel between the starburst core and the intergalactic medium. Our novel approach offers the tools needed to quantify the effects of outflows on galactic magnetic fields as well as their influence on the intergalactic medium and evolution of energetic particles.
description: 17 pages, 9 figures, Accepted for publication in ApJ
Κατανόηση του μεταφορικού λόγου με την προσθήκη εικόνας από παιδιά με πραγματολογικά ελλείμματα
Creators: name: Αναστασίου, Αικατερίνη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Κατανόηση μεταφορικού λόγου
Πραγματολογικά ελλείμματα
Εικόνα
Understanding the metaphor
Factual deficits
With the addition of a picture

description: Η πραγματολογική χρήση του λόγου αποτελεί βασική κατάκτηση, η οποία αποτελεί προϋπόθεση για την επίτευξη της επικοινωνίας ανάμεσα στα άτομα. Η κατανόηση της μη κυριολεκτικής χρήσης του λόγου, των ιδιωμάτων, των μεταφορικών εκφράσεων αλλά και η επίγνωση της επιλογής του λόγου που ταιριάζει στο επικοινωνιακό πλαίσιο έχουν άμεση σύνδεση με τον τομέα αυτό του λόγου ενώ η μη κατάκτηση των πραγματολογικών δεξιοτήτων μπορεί να επιφέρει δυσκολία στα άτομα που εκφράζεται με ελλείμματα τόσο στην αναγνώριση εκφράσεων όσο στην αδυναμία σύναψης συζήτησης και γενικότερα επικοινωνίας με τους γύρω του. Η αξιολόγηση των πραγματολογικών ελλειμμάτων των παιδιών αλλά και η παρέμβαση μέσω δραστηριοτήτων που περιέχουν εικόνες μπορούν να φανούν ιδιαίτερα χρήσιμες για την ανάπτυξη των πραγματολογικών του δεξιοτήτων. Η έρευνα αυτή αποτελεί μια προσπάθεια αξιολόγησης της αποτελεσματικότητας της παρέμβασης με χρήση εικόνας για παιδιά που παρουσιάζουν πραγματολογικά ελλείμματα μέσα από τη χορήγηση δοκιμασίας για την αξιολόγηση των πραγματολογικών ελλειμμάτων, την οποία κατασκεύασε η ερευνήτρια. Τελικά, η χρήση του οπτικού υλικού φάνηκε πως βοήθησε ιδιαίτερα τα παιδιά να κατανοήσουν τη μεταφορική χρήση του λόγου ενώ σε δεύτερη συνάντηση με την ερευνήτρια και επίλυση της δοκιμασίας επέδειξαν σημαντική βελτίωση στις επιδόσεις τους αναφορικά με τις πραγματολογικές τους δεξιότητες και την αναγνώριση των μεταφορικών εκφράσεων.
description: Realistic use of speech is a basic conquest, which consist a basic condition in order to achieve communication between individuals. Understanding the non-literal use of speech, idiom expressions, figurative speech and awareness of the choice of language that fits the communication framework, have a direct link to this area of speech. Non-acquisition of these skills can make communication difficult for individuals, who have deficits in the recognition of these expressions and the inability to hold a discussion and communication in general with others. The assessment of children's actual deficits and the intervention through activities containing images can be particularly useful for the development of their factual skills. This research consist an attempt of the evaluation of the effectiveness of interventions in children, who present factual deficits, through a test constructed by the researcher. Ultimately, the use of visual material seemed to have helped children to understand the use of figurative speech, while in a second encounter with the researcher, they showed a significant improvement in their performance in the test in terms of factual skills and recognition of figurative speech.
Photoelectron experiments and studies of X-ray absorption near edge structure in alkaline-earth and rare-earth flurides
Creators: name: Gao, Yuan
Publisher: name: University of British Columbia
Year: 2009

description: Alkaline-earth fluorides and rare-earth trifluorides possess technological importance for applications in multi-layer electronic device structures and opto-electronic devices. Interfaces between thin films of YbF₃ and Si(111) substrates were studied by photoelectron spectroscopy and x-ray absorption spectroscopy using synchrotron radiation. Results of YbF₃/Si(111) were compared with those of TmF₃Si(111). While electrons in the Si valence band are prevented from occupying the empty 4f levels in TmF₃ at the interface by the on-site Coulomb repulsion energy, the charge transfer from Si to YbF₃ is possible because the totally filled 4f states in Yb still lie below the Si valence band maximum. The theory of x-ray absorption near edge structure (XANES) is incomplete except for a few particularly simple special cases. A Bragg reflection model was developed to qualitatively explain the oscillations in XANES, in terms of the scattering of the photoelectron wave between families of lattice planes as set out by the Bragg condition for backscattering. The model was found to represent the data for systems with nearly free electron like conduction bands reasonably well. High resolution CaF₂ fluorine K edge XANES was used as a prototype to understand XANES in more depth on systems with strong core hole effects. Unlike previous work which involved multiple scattering cluster calculations that include only short range order effects, both the long range order and the symmetry breaking core holes are included in a new bandstructure approach in which the core hole is treated with a supercell technique. A first principles calculation with the use of pseudopotentials successfully reproduced all the main features of the first 15 eV of the fluorine K edge in CaF₂ which had not been explained with the cluster calculations. A comparison of the theoretical and experimental fluorine K edges in CaF₂ and BaF₂ was used to identify the structure related features. The possibility of multi-electron excitations being responsible for higher energy features in the XANES was investigated by comparing the energy loss satellites in the fluorine is x-ray photoelectron spectra with features at corresponding energies in the fluorine K edge absorption spectra. Finally the fluorine K edges in the rare-earth trifluorides LaF₃, CeF₃, NdF₃, SmF₃, EuF₃, DyF₃ and YbF₃ were explored for the first time with the high resolution x-ray absorption spectroscopy. The near edge part of the fluorine K edges in all seven rare-earth trifluorides was found not to be dominated by the Bragg peaks because of the short life time of the photoelectron and the low crystal symmetry.
Torsion theories for algebras of affiliated operators of finite von Neumann algebras
Creators: name: Vas, Lia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Rings and Algebras (math.RA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 16W99, 46L99, 16S90

description: The dimension of any module over an algebra of affiliated operators ${\mathcal U}$ of a finite von Neumann algebra ${\mathcal A}$ is defined using a trace on ${\mathcal A}.$ All zero-dimensional ${\mathcal U}$-modules constitute the torsion class of torsion theory $(\mathrm{\bf T},\mathrm{\bf P})$. We show that every finitely generated ${\mathcal U}$-module splits as the direct sum of torsion and torsion-free part. Moreover, we prove that the theory $(\mathrm{\bf T},\mathrm{\bf P})$ coincides with the theory of bounded and unbounded modules and also with the Lambek and Goldie torsion theories. Lastly, we use the introduced torsion theories to give the necessary and sufficient conditions for ${\mathcal U}$ to be semisimple.
description: To appear in Rocky Mountain Journal of Mathematics
Groverian Entanglement Measure of Pure Quantum States with Arbitrary Partitions
Creators: name: Shimoni, Yishai
name: Biham, Ofer
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Groverian entanglement measure of pure quantum states of $n$ qubits is generalized to the case in which the qubits are divided into any $m \le n$ parties and the entanglement between these parties is evaluated. To demonstrate this measure we apply it to general states of three qubits and to symmetric states with any number of qubits such as the Greenberg-Horne-Zeiliner state and the W state.
description: 5 pages, 2 figures, 1 table
Convolutors of translation-modulation invariant Banach spaces of ultradistributions
Creators: name: Neyt, Lenny
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 46F05. Secondary 44A35, 42B10, 46H25, 81S30

description: We study the space of tempered ultradistributions whose convolutions with test functions are all contained in a given translation-modulation invariant Banach space of ultradistributions. Our main result will be the first structural theorem for the aforementioned space. As an application we consider several extensions of convolution.
description: 37 pages
Discretization errors in the spectrum of the Hermitian Wilson-Dirac operator
Creators: name: Sharpe, Stephen R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I study the leading effects of discretization errors on the low energy part of the spectrum of the Hermitian Wilson-Dirac operator in infinite volume. The method generalizes that used to study the spectrum of the Dirac operator in the continuum, and uses partially quenched chiral perturbation theory for Wilson fermions. The leading-order corrections are proportional to a^2 (a being the lattice spacing). At this order I find that the method works only for one choice of sign of one of the three low energy constants describing discretization errors. If these constants have the relative magnitudes expected from large N_c arguments, then the method works if the theory has an Aoki phase for m of order a^2, but fails if there is a first-order transition. In the former case, the dependence of the gap and the spectral density on m and a^2 are determined. In particular, the gap is found to vanish more quickly as m_pi^2-> 0 than in the continuum. This reduces the region where simulations are safe from fluctuations in the gap.
description: 44 pages, 16 figures (v2: reference added; v3: published version--typos corrected)
On a Possible Solution to the Tidal Realignment Problem for Hot Jupiters
Creators: name: Anderson, Kassandra R.
name: Winn, Joshua N.
name: Penev, Kaloyan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Hot stars with hot Jupiters have a wide range of obliquities, while cool stars with hot Jupiters tend to have low obliquities. An enticing explanation for this pattern is tidal realignment of the cool host stars, although this explanation assumes that obliquity damping occurs faster than orbital decay, an assumption that needs further exploration. Here we revisit this tidal realignment problem, building on previous work identifying a low-frequency component of the time-variable tidal potential that affects the obliquity but not the orbital separation. We adopt a recent empirically-based model for the stellar tidal quality factor and its sharp increase with forcing frequency. This leads to enhanced dissipation at low frequencies, and efficient obliquity damping. We model the tidal evolution of 46 observed hot Jupiters orbiting cool stars. A key parameter is the stellar age, which we determine in a homogeneous manner for the sample, taking advantage of Gaia DR2 data. We explore a variety of tidal histories and futures for each system, finding in most cases that the stellar obliquity is successfully damped before the planet is destroyed. A testable prediction of our model is that hot-Jupiter hosts with orbital periods shorter than 2--3 days should have obliquities much smaller than $1^\circ$. With the possible exception of WASP-19b, the predicted future lifetimes of the planets range from $10^8$\,yr to more than $10^{10}$\,yr. Thus, our model implies that these hot Jupiters are probably not in immediate danger of being devoured by their host stars while they are on the main sequence.
description: 24 pages, 14 figures, 1 table, accepted for publication in ApJ. Revised version following the referee report
Mechanical unfolding of RNA: From hairpins to structures with internal multiloops
Creators: name: Hyeon, Changbong
name: Thirumalai, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Mechanical unfolding of RNA structures, ranging from hairpins to ribozymes, using laser optical tweezer (LOT) experiments have begun to reveal the features of the energy landscape that cannot be easily explored using conventional experiments. Upon application of constant force ($f$), RNA hairpins undergo cooperative transitions from folded to unfolded states whereas subdomains of ribozymes unravel one at a time. Here, we use a self-organized polymer (SOP) model and Brownian dynamics simulations to probe mechanical unfolding at constant force and constant-loading rate of four RNA structures of varying complexity. Our work shows (i) the response of RNA to force is largely determined by the native structure; (ii) only by probing mechanical unfolding over a wide range of forces can the underlying energy landscape be fully explored.
description: 26 pages, 6 figures, Biophys. J. (in press)
Additional file 1 of Triglyceride-glucose index, symptomatic intracranial artery stenosis and recurrence risk in minor stroke patients with hypertension
Creators: name: Wang, Yongle
name: Liu, Tingting
name: Li, Yanan
name: Zhang, Kaili
name: Fan, Haimei
name: Ren, Jing
name: Li, Juan
name: Li, Yali
name: Li, Xinyi
name: Wu, Xuemei
name: Wang, Junhui
name: Xue, Lixi
name: Gao, Xiaolei
name: Yan, Yuping
name: Li, Gaimei
name: Liu, Qingping
name: Niu, Wenhua
name: Du, Wenxian
name: Liu, Yuting
name: Niu, Xiaoyuan
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Biological Sciences not elsewhere classified
subject: Hematology
subject: Virology

description: Additional file 1: Table S1. Frequency and percentage of missing variables. Table S2. Baseline characteristics of patients included and excluded due to missing data of TG, FBG and intracranial artery imaging. Table S3. Baseline characteristics of patients with or without sICAS. Table S4. Univariate logistic regression analysis of risk factors associated with sICAS. Table S5. Univariate linear regression analysis of risk factors associated with ICASB. Table S6. Subgroup analysis between TyG index and the degree of sICAS. Table S7. Univariate Cox regression analysis of risk factors associated with ischemic stroke recurrence. Table S8. Sensitivity analysis after multiple imputation of variates with missing values. Table S9. Interaction effect on stroke recurrence between TyG and sICAS. Table S10. The value of TyG improved the risk stratification of stroke recurrence according to continuous-NRI and IDI. Figure S1. Pattern of missing data. Figure S2. Distribution of arteries responsible for sICAS. Figure S3. Association between responsible sICAS arteries and TyG. Figure S4. Contour plots reflecting the effect of age, BMI, and blood pressure on the relationship between TyG and sICAS. Figure S5. X-tile analyses of TyG optimal cutoff value. Figure S6. Combined effect of TyG and burden of ICAS on ischemic stroke recurrence. Figure S7. IDI plot.
Strongly Correlated Electrons in the $[Ni(hmp)(ROH)X]_4$ Single Molecule Magnet: A DFT+U Study
Creators: name: Cao, Chao
name: Hill, Stephen
name: Cheng, Hai-Ping
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The single-molecule magnet $\mathrm{[Ni(hmp)(MeOH)Cl]_4}$ is studied using both density functional theory (DFT) and the DFT+U method, and the results are compared. By incorporating a Hubbard-U like term for both the nickel and oxygen atoms, the experimentally determined ground state is successfully obtained, and the exchange coupling constants derived from the DFT+U calculation agree with experiment very well. The results show that the nickel 3d and oxygen 2p electrons in this molecule are strongly correlated, and thus the inclusion of on-site Coulomb energies is crucial to obtaining the correct results.
description: 4 pages, 5 figures, 2 tables. accepted by Phys. Rev. Lett
Η ανταγωνιστικότητα του γάλακτος στην ελληνική αγορά
Creators: name: Χατζησυμεωνίδου, Στέλλα Ιορδάνη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανταγωνιστικότητα
Γάλα
Ελληνική αγορά
Competitiveness
Milk
Greek market

description: Η παρούσα μεταπτυχιακή εργασία αφορά την αγορά γάλακτος στην Ελλάδα και πιο συγκεκριμένα την ανταγωνιστικότητα του κλάδου. Με την παρούσα εργασία επιδιώκεται η εξέταση της διάρθρωσης του κλάδου αλλά και των βασικών μεγεθών που τον απαρτίζουν. Στα πλαίσια της μεταπτυχιακής εργασίας ορίζονται τα γαλακτοκομικά προϊόντα τα συστατικά και η αξία του γάλακτος όπως επίσης και τα στάδια επεξεργασίας του. Στη συνέχεια γίνεται αναφορά για τις κατηγορίες του γάλακτος προκειμένου να καταστεί σαφές ότι γίνεται λόγος για ένα προϊόν της βασικής διατροφής των Ελλήνων. Στη συνέχεια παρουσιάζονται στοιχεία προσφοράς και ζήτησης του γάλακτος στην ελληνική αγορά, όπως επίσης και το νομοθετικό πλαίσιο που αφορά τον κλάδο. Τέλος γίνεται χρηματοοικονομική ανάλυση των μεγαλύτερων εταιριών επεξεργασίας γάλακτος που εδρεύουν στην εγχώρια αγορά γάλακτος .Με την ολοκλήρωση της μεταπτυχιακής εργασίας αναμένεται να έχει αποτυπωθεί με σαφήνεια ο τρόπος της λειτουργίας της γαλακτοβιομηχανίας καθώς και θέση της καθεμιάς εταιρείας στον κλάδο.
description: This master thesis concerns the milk market in Greece and more specifically the competitiveness of the sector. This paper seeks to examine the structure of the industry and its basic dimensions. In the context of the dissertation, dairy products are defined as the constituents and the value of the milk as well as the stages of its processing. Then there is a reference to the categories of milk in order to make it clear that a product of the basic diet of the Greeks is presented below and there are presented elements of supply and demand of milk in the Greek market. The completion of the dissertation is expected to have clearly illustrated the way the sector works and the needs of Greek society.
Self-injection locking of the gain-switched laser diode
Creators: name: Shitikov, Artem E.
name: Lobanov, Valery E.
name: Kondratiev, Nikita M.
name: Voloshin, Andrey S.
name: Lonshakov, Evgeny A.
name: Bilenko, Igor A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We experimentally observed self-injection locking regime of the gain-switched laser to high-Q optical microresonator. We revealed that comb generated by the gain-switched laser experiences a dramatic reduce of comb teeth linewidths in this regime. We demonstrated the Lorentzian linewidth of the comb teeth of sub-kHz scale as narrow as for non-switched self-injection locked laser. Such setup allows generation of high-contrast electrically-tunable optical frequency combs with tunable comb line spacing in a wide range from 10 kHz up to 10 GHz. The characteristics of the generated combs were studied for various modulation parameters - modulation frequency and amplitude, and for parameters, defining the efficiency of the self-injection locking - locking phase, coupling efficiency, pump frequency detuning.
description: Physical Review Applied
A GEANT-based study of atmospheric neutrino oscillation parameters at INO
Creators: name: Samanta, Abhijit
name: Bhattacharya, Sudeb
name: Ghosal, Ambar
name: Kar, Kamales
name: Majumdar, Debasish
name: Raychaudhuri, Amitava
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have studied the dependence of the allowed space of the atmospheric neutrino oscillation parameters on the time of exposure for a magnetized Iron CALorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We have performed a Monte Carlo simulation for a 50 kTon ICAL detector generating events by the neutrino generator NUANCE and simulating the detector response by GEANT. A chi-square analysis for the ratio of the up-going and down-going neutrinos as a function of $L/E$ is performed and the allowed regions at 90% and 99% CL are displayed. These results are found to be better than the current experimental results of MINOS and Super-K. The possibilities of further improvement have also been discussed.
description: 8 pages, 13 figures, a new figure added, version accepted in IJMPA