cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Oscillator-to-oscillator codes do not have a threshold
Creators: name: Hänggli, Lisa
name: Koenig, Robert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is known that continuous variable quantum information cannot be protected against naturally occurring noise using Gaussian states and operations only. Noh et al. (PRL 125:080503, 2020) proposed bosonic oscillator-to-oscillator codes relying on non-Gaussian resource states as an alternative, and showed that these encodings can lead to a reduction of the effective error strength at the logical level as measured by the variance of the classical displacement noise channel. An oscillator-to-oscillator code embeds K logical bosonic modes (in an arbitrary state) into N physical modes by means of a Gaussian N-mode unitary and N-K auxiliary one-mode Gottesman-Kitaev-Preskill-states. Here we ask if - in analogy to qubit error-correcting codes - there are families of oscillator-to-oscillator codes with the following threshold property: They allow to convert physical displacement noise with variance below some threshold value to logical noise with variance upper bounded by any (arbitrary) constant. We find that this is not the case if encoding unitaries involving a constant amount of squeezing and maximum likelihood error decoding are used. We show a general lower bound on the logical error probability which is only a function of the amount of squeezing and independent of the number of modes. As a consequence, any physically implementable family of oscillator-to-oscillator codes combined with maximum likelihood error decoding does not admit a threshold.
description: 33 pages, 5 figures, updated to match published version
On the closure property of Lepage equivalents of Lagrangians
Creators: name: Voicu, Nicoleta
name: Garoiu, Stefan
name: Vasian, Bianca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 58A10, 58A20, 83D05

description: Lepage equivalents of Lagrangians are a higher order, field-theoretical generalization of the notion of Poincare-Cartan form from mechanics and play a similar role: they give rise to a geometric formulation (and to a geometric understanding) of the calculus of variations. A long-standing open problem is the determination, for field-theoretical Lagrangians of order greater than one, of a Lepage equivalent with the so-called closure property: the Lepage equivalent is a closed differential form if and only if the Lagrangian has vanishing Euler-Lagrange expressions. The present paper proposes a solution to this problem, for general Lagrangians, of any order. The construction is a local one; yet, we show that in most of the cases of interest for physical applications, the obtained Lepage equivalent is actually globally defined. A variant of this construction, which is advantageous for reducible Lagrangians, is also introduced. In particular, for reducible Lagrangians of order two, the obtained Lepage equivalents are of order one.
description: 15 pages
Low concordance of differential DNA methylation analysis methods
Creators: name: McCormick, Helen
name: Hickey, Peter
name: Giannoulatou, Eleni
name: Cropley, Jennifer
name: Suter, Catherine
Publisher: name: F1000Research
Year: 2015

description: DNA methylation is one of the most widely used markers for the study of epigenetic contributions to phenotypic variation and disease. There are several methods for analyzing genome-wide DNA methylation data in common use, but there has been no rigorous evaluation of their performance. We have performed a systematic assessment and comparison of three packages: MethySig, methylKit  and DSS, using an empirical dataset of 12 reduced representation bisulphite sequencing libraries (6 test, 6 control). Surprisingly, we observed very low concordance among these commonly used model-based and binomial test-based approaches: using equivalent pre-processing and filtering parameters for each method, we found that the three methods identified significant differentially methylated cytosines at a concordance rate of less than 1%. Similarly low levels of concordance were observed with identification of differentially methylated regions using tiled data. Our study highlights the need for systematic approaches to reliable differential methylation analysis via data simulation. This concept of simulation will be discussed in the context of the growing implementation of epigenomic data in human medicine.
Channel Access-Based Self-Organized Clustering in Ad Hoc Networks
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 100503 Computer Communications Networks
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: An ad hoc network is a self-organized and distributed entity consisting of a number of mobile stations (MSs) without thecoordination of any centralized access point. Clustering is one of the fundamental problems in ad hoc networks. In this context, we describe a distributed clustering algorithm for multihop ad hoc networks. We first propose a randomized control channel broadcast access method to maximize the worst-case control channel efficiency, based on which a distributed clustering algorithm is proposed. Both theoretical analysis and simulations indicate that the proposed clustering algorithm takes much less time and overhead to cluster a given network with more stable cluster structure, while incurring very small maintenance overhead in a dynamic network resulting from the mobility of the MSs.
Removing Atmospheric Fringes from Zwicky Transient Facility i-Band Images using Principal Component Analysis
Creators: name: Medford, Michael S.
name: Nugent, Peter
name: Goldstein, Danny
name: Masci, Frank J.
name: Andreoni, Igor
name: Beck, Ron
name: Coughlin, Michael W.
name: Duev, Dmitry A.
name: Mahabal, Ashish A.
name: Riddle, Reed L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Zwicky Transient Facility is a time-domain optical survey that has substantially increased our ability to observe and construct massive catalogs of astronomical objects by use of its 47 square degree camera that can observe in multiple filters. However the telescope's i-band filter suffers from significant atmospheric fringes that reduce photometric precision, especially for faint sources and in multi-epoch co-additions. Here we present a method for constructing models of these atmospheric fringes using Principal Component Analysis that can be used to identify and remove these artifacts from contaminated images. In addition, we present the Uniform Background Indicator as a quantitative measurement of the reduced correlated background noise and photometric error present after removing fringes. We conclude by evaluating the effect of our method on measuring faint sources through the injection and recovery of artificial stars in both single-image epochs and co-additions. Our method for constructing atmospheric fringe models and applying those models to produce cleaned images is available for public download in the open source python package \href{https://github.com/MichaelMedford/fringez}{fringez}.
description: 13 pages, 10 figures, accepted to PASP (6/24/2021)
Durability of buried galvanized steel structures in British Columbia
Creators: name: Galtung-Døsvig, Tom
Publisher: name: University of British Columbia
Year: 2009

description: The local goal of this thesis was to collect information regarding the determination of the service life of galvanized steel plates, which are used in the construction of soil-steel structures. British Columbia's Ministry of Transportation and Highways (MoTH) detected durability problems in some of its water carrying soil/steel structures, and requested that research be done to adopt design life specifications for the future installations of structures. This work summarizes the processes of degradation which affect the durability of soil/steel structures and discusses the design life practices currently employed by many European countries and the U . S. Based on a survey of 35 galvanized steel drainage structures and underpasses conducted by the author on Vancouver Island during the summer of 1994, recommendations are given regarding the durability of these particular structures. A method was devised to evaluate design service life based on the new design life philosophy, specifically fitted to environmental conditions encountered in Coastal British Columbia.
Evidence for X(3872) in PbPb collisions and studies of its prompt production at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (PbPb) collisions at a center-of-mass energy of $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV per nucleon pair, using the decay chain X(3872) $\to$ J$/ψ\, π^+π^- \to$ $μ^+μ^-π^+π^-$. The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb$^{-1}$. The measurement is performed in the rapidity and transverse momentum ranges $|y|$ $\lt$ 1.6 and 15 $\lt$ $p_\mathrm{T}$ $\lt$ 50 GeV$/c$. The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to $ψ$(2S) yield ratio is found to be $ρ^\mathrm{PbPb} = $ 1.08 $\pm$ 0.49 (stat) $\pm$ 0.52 (syst), to be compared with typical values of 0.1 for pp collisions. This result provides a unique experimental input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-005 (CMS Public Pages)
Διαχείριση τροχιών κινούμενων αντικειμένων σε περιβάλλον Hadoop:
Creators: name: Σανιδά, Σταυρούλα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: τροχιές
χωροχρονικά δεδομένα
κινούμενα αντικείμενα
λειτουργία join
trajectories
spatiotemporal data
moving objects
join processing
MapReduce
Hadoop

description: Μια από τις σημαντικότερες προκλήσεις στην αποδοτική διαχείριση δεδομένων είναι η αποθήκευση, η επερώτηση και η ανάλυση μεγάλων όγκων δεδομένων. Λαμβάνοντας υπόψη ότι η θέση και ο χρόνος είναι σημαντικά χαρακτηριστικά τα οποία συχνά συνοδεύουν τα αντικείμενα, στην εργασία αυτή, μελετάμε τη διαχείριση μεγάλων συνόλων δεδομένων τροχιών (massive trajectory datasets) με βάση το προγραμματιστικό μοντέλο MapReduce. Συγκεκριμένα, μελετάμε την λειτουργία της «ένωσης-join» μεταξύ ενός ενδεχομένως μεγάλου συνόλου δεδομένων το οποίο αποτελείται από περιοχές ενδιαφέροντος (regions of interest) και ενός ογκώδους συνόλου δεδομένων τροχιών το οποίο αναπαριστά την κίνηση ενός συνόλου κινούμενων αντικειμένων. Η έξοδος της λειτουργίας της «ένωσης-join» είναι ένα σύνολο εγγραφών οι οποίες αναπαριστούν την τομή μεταξύ τμημάτων των τροχιών (segments) και χωρικών περιοχών (spatial region) μαζί με τα αντίστοιχα χρονικά στιγμιότυπα (time instances). Το αποτέλεσμα αυτό παρουσιάζει ιδιαίτερο ενδιαφέρον για διάφορες εφαρμογές όπως, η συμπλήρωση των τροχιών με σημασιολογικό περιεχόμενο, ο χαρακτηρισμός των τροχιών χρησιμοποιώντας την πληροφορία που περιέχεται στις περιοχές ενδιαφέροντος ή ακόμη η ανίχνευση τροχιών οι οποίες παραβιάζουν απαγορευμένες ζώνες/περιοχές. Τέτοιου είδους έξοδος μπορεί επίσης να χρησιμοποιηθεί για να υποστηρίξει άλλες λειτουργίες.
description: One of the most important challenges for efficient data management is the storage, querying and analysis of massive datasets. Taking into account that location and time are important attributes that frequently accompany objects, in this work, we study the management of massive trajectory datasets based on the MapReduce programming paradigm. In particular, we explore the join operation between a potentially large set containing regions of interest and a massive set of trajectories representing the motion of a set of moving objects. The output of this join operation is a set of records representing the intersection between trajectory segments and spatial regions along with the corresponding time instances. This is an interesting result in order to complement trajectories with semantic content, to annotate trajectories using information contained in regions of interest, or to detect trajectories violating restricted areas, just to name a few applications. This kind of output can be used to support other operations as well.
Thermodynamics of AdS/QCD
Creators: name: Kajantie, K.
name: Tahkokallio, T.
name: Yee, Jung-Tay
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study finite temperature properties of four dimensional QCD-like gauge theories in the gauge theory/gravity duality picture. The gravity dual contains two deformed 5d AdS metrics, with and without a black hole, and a dilaton. We study the thermodynamics of the 4d boundary theory and constrain the two metrics so that they correspond to a high and a low temperature phase separated by a first order phase transition. The equation of state has the standard form for the pressure of a strongly coupled fluid modified by a vacuum energy, a bag constant. We determine the parameters of the deformation by using QCD results for $T_c$ and the hadron spectrum. With these parameters, we show that the phase transition in the 4d boundary theory and the 5d bulk Hawking-Page transition agree. We probe the dynamics of the two phases by computing the quark-antiquark free energy in them and confirm that the transition corresponds to confinement-deconfinement transition.
description: 1+19 pages, 6 figures, references added, section 3 improved
Current-Voltage Characteristics of Long-Channel Nanobundle Thin-Film Transistors: A Bottom-up Perspective
Creators: name: Pimparkar, N. V.
name: Kumar, S.
name: Murthy, J. Y.
name: Alam, M. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: By generalizing the classical linear response theory of stick percolation to nonlinear regime, we find that the drain current of a Nanobundle Thin Film Transistor (NB-TFT) is described under a rather general set of conditions by a universal scaling formula ID = A/LS g(LS/LC, rho_S * LS * LS) f(VG, VD), where A is a technology-specific constant, g is function of geometrical factors like stick length (LS), channel length (LC), and stick density (rho_S) and f is a function of drain (VD) and gate (VG) biasing conditions. This scaling formula implies that the measurement of full I-V characteristics of a single NB-TFT is sufficient to predict the performance characteristics of any other transistor with arbitrary geometrical parameters and biasing conditions.
Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s) = 1.96 TeV
Creators: name: CDF Collaboration
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the top quark pair production cross section in ppbar collisions at sqrt(s)=1.96 TeV using 318 pb^{-1} of data collected with the Collider Detector at Fermilab. We select ttbar decays into the final states e nu + jets and mu nu + jets, in which at least one b quark from the t-quark decays is identified using a secondary vertex-finding algorithm. Assuming a top quark mass of 178 GeV/c^2, we measure a cross section of 8.7 +-0.9 (stat) +1.1-0.9 (syst) pb. We also report the first observation of ttbar with significance greater than 5 sigma in the subsample in which both b quarks are identified, corresponding to a cross section of 10.1 +1.6-1.4(stat)+2.0-1.3 (syst) pb.
description: Accepted for publication in Physics Review Letters, 7 pages
Learning elliptic partial differential equations with randomized linear algebra
Creators: name: Boullé, Nicolas
name: Townsend, Alex
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 65N80, 35J08, 35R30, 60G15, 65F55 65N80, 35J08, 35R30, 60G15, 65F55

description: Given input-output pairs of an elliptic partial differential equation (PDE) in three dimensions, we derive the first theoretically-rigorous scheme for learning the associated Green's function $G$. By exploiting the hierarchical low-rank structure of $G$, we show that one can construct an approximant to $G$ that converges almost surely and achieves a relative error of $\mathcal{O}(Γ_ε^{-1/2}\log^3(1/ε)ε)$ using at most $\mathcal{O}(ε^{-6}\log^4(1/ε))$ input-output training pairs with high probability, for any $0
description: 25 pages, 4 figures
First results from SAPAC: towards a 3D-picture of the Fornax cluster core
Creators: name: Dunn, Laura P.
name: Jerjen, Helmut
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A sophisticated SBF analysis package has been developed, designed to measure distances of early-type galaxies by means of surface brightness fluctuations of unresolved stars. This suite of programs called SAPAC is made readily available to the astronomical community for extensive testing with the long-term goal to provide the necessary tools for systematic distance surveys of early-type galaxies using modern optical/NIR telescopes equipped with wide-field cameras. We discuss the technical and scientific concepts of SAPAC and demonstrate its capabilities by analysing deep B and R-band CCD images of 10 dwarf elliptical (dE) galaxy candidates in the Fornax cluster obtained with FORS1 at the VLT. All candidates are confirmed as cluster members. We then turn our attention to the innermost region of the Fornax cluster. A total of 29 early-type galaxies closer than three cluster core radii (2 degrees) from the central galaxy NGC1399 have radial velocities and SBF distances. Their Hubble diagram exhibits a pronounced S-shaped infall pattern suggesting a picture that Fornax is still in the process of formation during the present epoch through a general collapse and possible accretion of distinct groups of galaxies. The associated collapse time is 2.9(+1.6, -0.9)Gyr. After cleansing our galaxy sample from a few kinematical outliers the true distance of the Fornax cluster core is determined at 20.13+-0.40 Mpc [(m-M)_0=31.51+-0.04mag]. Applying a bootstrap resampling technique on the distance distribution with individual distance errors taken into account further reveals a small intrinsic cluster depth of sigma_int=0.74(+0.52,-0.74)Mpc in best agreement with the cluster's linear extension in the sky: sigma_R.A=sigma_DEC~=0.5Mpc. (Abridged)
description: 33 pages, 7 figures, accepted to The Astronomical Journal
PatternQuery: Web application for fast detection of biomacromolecular structural patterns in the entire Protein Data Bank
Creators: name: Lukáš Pravda
name: Sehnal, David
name: Vařeková, Radka Svobodová
name: Crina-Maria Ionescu
name: Koča, Jaroslav
Publisher: name: F1000Research
Year: 2015

description: Well defined biomacromolecular patterns such as binding sites, catalytic sites, specific protein or nucleic acid sequences, etc. precisely modulate many important biological phenomena. We introduce PatternQuery, a web-based application designed for detection and fast extraction of such patterns. The application uses a unique query language with Python-like syntax to define the patterns that will be extracted from datasets provided by the user, or from the entire Protein Data Bank (PDB). Moreover, the database-wide search can be restricted using a variety of criteria, such as PDB ID, resolution, and organism of origin, to provide only relevant data. The extraction generally takes a few seconds for several hundreds of entries, up to approximately one hour for the whole PDB. The detected patterns are made available for download to enable further processing, as well as presented in a clear tabular and graphical form directly in the browser. The unique design of the language and the provided service could pave the way towards novel PDB-wide analyses, which were either difficult or unfeasible in the past. The application is available free of charge at http://ncbr.muni.cz/PatternQuery.
Index pairings for pullbacks of C*-algebras
Creators: name: Dabrowski, L.
name: Hadfield, T.
name: Hajac, P. M.
name: Matthes, R.
name: Wagner, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 81R60, 19D55

description: In this overview, we study how to reduce the index pairing for a fibre-product C*-algebra to the index pairing for the C*-algebra over which the fibre product is taken. As an example we analyze the case of suspensions and apply it to noncommutative instanton bundles of arbitrary charges over the suspension of quantum deformations of the 3-sphere.
description: 18 pages, to appear in Banach Centre Publications. New title, one more author, totally rewritten with new material added
Application of large-scale text-mining and curation for extracting neuronal electrophysiology data
Creators: name: Tebaykin, Dmitry
name: Shreejoy Tripathy
name: Li, Brenna
name: Delaram Abdollahzadeh
name: Anderson, Kristofer
name: Pavlidis, Paul
Publisher: name: F1000Research
Year: 2015

description: Recently, there has been a major effort by neuroscientists to systematically organize and integrate vast quantities of brain data. Here, as part of the NeuroElectro project (www.neuroelectro.org), we employ large scale text-mining, supplemented with manual curation, to extract quantitative measurements from >100K neuroscience full-text articles.

Specifically, we use heuristic and machine learning approaches to identify sentences containing electrophysiological data or metadata entries. We then break these sentences down into smaller pieces and collect the desired information using regular expression rule based methods. For example, we identify ion concentrations (e.g., Ca2+, Mg2+, etc.) in chemical solutions with 89% accuracy. While major ion concentrations are known to have specific qualitative effects on neurons, they are not well quantified for various neuron types.

Another domain that we are mining is neuronal synaptic plasticity, which describes the strengthening (or weakening) of connections between neurons. Although, our regular expression based approach can identify this information with some degree of accuracy, we have found that it is absolutely necessary to manually curate the text-mined data. For this purpose we have employed a graphical interface (NLP BRAT) and trained curators who are able to efficiently verify the raw text-mined values.

Ultimately, this extracted data will enhance the existing NeuroElectro database of normalized neuronal electrophysiology values. It would further allow us to link electrophysiological diversity across neuron types to corresponding differences in gene expression levels and disease phenotypes.
TOI 122b and 237b, Two Warm Exoplanets Orbiting Inactive M Dwarfs Discovered by TESS
Creators: name: Waalkes, William
name: Berta-Thompson, Zachory
name: Collins, Karen
Publisher: name: Zenodo
Year: 2021
Subjects: Exoplanet
M dwarf
TESS
Transit
Super-Earth

description: We set out to validate and characterize two TESS Objects of Interest (TOIs): TOI 122 and TOI 237. Using high precision light curves from observatories around the globe as well as SOAR Speckle imaging, Magellan FIRE spectra, and SALT-HRS spectra, we rule out various false positive scenarios and constrain the stellar and planetary properties.
description: Paper published in AJ, Jan 2021
Incremental effective stress liquefaction modelling of sands
Creators: name: McIntyre, Jay Duncan
Publisher: name: University of British Columbia
Year: 2009

description: A one dimensional incremental effective stress liquefaction model is presented. Two versions of the model have been developed - a static model to simulate the behaviour of a sand element to laboratory cyclic simple shear tests, and a dynamic model to compute the response of sand under harmonic or earthquake loading. For undrained cyclic loading, neither model incorporates strain softening response typical for loose sands, but have been calibrated to predict the response type known as cyclic mobility. The static version of the model is calibrated to match characteristic laboratory cyclic simple shear test results. Comparisons between laboratory results and modelled data are presented. The dynamic version of the model incorporates the key components of the static model, and can be used to predict the response of a simplified soil profile under dynamic loading. In particular, earthquake acceleration time history records may be used as input. The dynamic model was applied to simulate the field case history recorded at the Wildlife Site in California during the 1987 Superstition Hills earthquake. The recorded downhole acceleration time history was used as input for the dynamic model and the predicted response, in terms of surface acceleration, relative displacement, and porewater pressure, compared with the measured values. The predicted acceleration and displacement time histories are in good agreement with the measured values in terms of both the amplitude and characteristic frequency of response. The predicted porewater pressures are not in good agreement with the recorded values. The predicted porewater pressure rise is much faster than the measured data. The slower response may be due to limitations in the compliance of the measuring system and to the possibility that liquefaction did not occur simultaneously at all points in the liquefied layer.
Cosmological Topologically Massive Gravitons and Photons
Creators: name: Carlip, S.
name: Deser, S.
name: Waldron, A.
name: Wise, D. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study topologically massive (2+1)-dimensional gravity with a negative cosmological constant. The masses of the linearized curvature excitations about AdS_3 backgrounds are not only shifted from their flat background values but, more surprisingly, split according to chirality. For all finite values of the topological mass, we find a single bulk degree of freedom with positive energy, and exhibit a complete set of normalizable, finite-energy wave packet solutions. This model can also be written as a sum of two higher-derivative SL(2,R) Chern--Simons theories, weighted by the central charges of the boundary conformal field theory. At two particular "critical" values of the couplings, one of these central charges vanishes, and linearized topologically massive gravity becomes equivalent to topologically massive electromagnetism; however, the physics of the bulk wave packets remains unaltered here.
description: 36 pages, 1 figure. v2: Expanded; exhibits localized normalizable wave packets and exact chiral pp-wave solutions. v3: Added references; clarification on bulk vs. boundary chirality. v4: Published version; changes include discussion of bulk solutions' asymptotic acceptability at all mu
Quantum Game Theory Based on the Schmidt Decomposition
Creators: name: Ichikawa, Tsubasa
name: Tsutsui, Izumi
name: Cheon, Taksu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a novel formulation of quantum game theory based on the Schmidt decomposition, which has the merit that the entanglement of quantum strategies is manifestly quantified. We apply this formulation to 2-player, 2-strategy symmetric games and obtain a complete set of quantum Nash equilibria. Apart from those available with the maximal entanglement, these quantum Nash equilibria are extensions of the Nash equilibria in classical game theory. The phase structure of the equilibria is determined for all values of entanglement, and thereby the possibility of resolving the dilemmas by entanglement in the game of Chicken, the Battle of the Sexes, the Prisoners' Dilemma, and the Stag Hunt, is examined. We find that entanglement transforms these dilemmas with each other but cannot resolve them, except in the Stag Hunt game where the dilemma can be alleviated to a certain degree.
description: 40 pages, 9 figures, PlainTeX
Surface rotation and magnetic activity for 55,000+ Kepler solar-type stars
Creators: name: Santos, Ângela R. G.
name: Breton, Sylvain N.
name: Mathur, Savita
name: García, Rafael A.
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence
Post main sequence cool stars
Stellar surface rotation
Stellar magnetic activity
Starspots
Kepler

description: Dark magnetic spots co-rotating with the stellar surface lead to quasi-periodic brightness variations, which enclose relevant information on stellar rotation and magnetic activity properties. In this work, we analyzed the Kepler long-cadence data of 159,710 main-sequence and subgiant FGKM stars. Rotation-period candidates are obtained by combining wavelet analysis with autocorrelation function of light curves. The final rotation periods Prot are selected via a machine learning algorithm, automatic selection, and complementary visual inspection. We successfully recover average rotation periods and photometric activity proxy Sph for 55,201 stars, which corresponds to an increase in detections of more than 60% in comparison with McQuillan et al. (2014). The rotation-period distribution is confirmed to be bimodal for the Kepler solar-type targets showing a slow- and a fast-rotating branches. While the rotation period generally decreases with increasing effective temperature Teff, the Sph behavior is more complex. For main-sequence GKM stars, Sph spans a wider range of values with increasing Teff, while F stars tend to have smaller Sph values in comparison with cooler stars. Overall, for main-sequence GKM stars, fast rotators are photometrically more active than slow rotators. For K stars, the slow- and fast-rotating branches are almost parallel in the Sph-Prot diagram, whereas for G stars the fast-rotating branch corresponds to a Sph saturated regime. Detecting Prot for a larger number of slow rotators, the upper edge of the Prot distribution is found to be located at longer periods than found previously.
description: {"references": ["Berger, T. A., et al. 2020, AJ, 159, 280", "Breton, S. N., et al. 2021, arXiv:2101.10152", "Ceillier, T., et al. 2017, A&A, 605, A111", "Ceillier, T., et al. 2016, MNRAS, 456, 119", "Garc\u00eda, R. A., et al. 2014, A&A, 572, A34", "Garc\u00eda, R. A., et al. 2011, MNRAS, 414, L6", "Jenkins, J. M., et al. 2010, ApJL, 713, L87", "Mathur, S., et al. 2014, A&A, 562, A124", "Mathur, S., et al. 2010, A&A, 518, A53", "Mathur, S., et al. 2017, ApJS, 229, 30", "McQuillan, A., et al. 2014, ApJS, 211, 24", "Santos, A. R. G., et al. 2019, ApJS, 244, 21"]}
Probing the timescale dependency of local and global variations in surface air temperature from climate simulations and reconstructions of the last millennia
Creators: name: Ellerhoff, Beatrice
name: Rehfeld, Kira
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Earth's climate can be understood as a dynamical system that changes due to external forcing and internal couplings. Essential climate variables, such as surface air temperature, describe this dynamics. Our current interglacial, the Holocene (11,700 yr ago to today), has been characterized by small variations in global mean temperature prior to anthropogenic warming. However, the mechanisms and spatiotemporal patterns of fluctuations around this mean, called temperature variability, are poorly understood despite their socio-economic relevance. Here, we examine discrepancies between temperature variability from model simulations and paleoclimate reconstructions by categorizing the scaling behavior of local and global surface air temperature on the timescale of years to centuries. To this end, we contrast power spectral densities (PSD) and their power-law scaling using simulated and observation-based temperature series of the last 6000 yr. We further introduce the spectral gain to disentangle the externally forced and internally generated variability as a function of timescale. It is based on our estimate of the joint PSD of radiative forcing, which exhibits a scale break around the period of 7 yr. We find that local temperature series from paleoclimate reconstructions show a different scaling behavior than simulated ones, with a tendency towards stronger persistence (i.e., correlation between successive values within a time series) on periods of 10 to 200 yr. Conversely, the PSD and spectral gain of global mean temperature are consistent across data sets. Our results point to the limitation of climate models to fully represent local temperature statistics over decades to centuries. By highlighting the key characteristics of temperature variability, we pave a way to better constrain possible changes in temperature variability with global warming and assess future climate risks.
description: Main manuscript: 15 pages, 1 table, 6 figures, Supplementary Materials: 3 tables, 16 figures
Εμπειρίες και απόψεις εκπαιδευτικών πρωτοβάθμιας εκπαίδευσης που συμμετείχαν στην παράλληλη στήριξη στο πλαίσιο της συνεκπαίδευσης
Creators: name: Μπουτσούκη, Αικατερίνη Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Παράλληλη στήριξη
Ειδική αγωγή
Συμπεριληπτική εκπαίδευση
Parallel support
Special education
Inclusive education

description: Στην Ελλάδα, τα τελευταία χρόνια, με τη ψήφιση του νόμου 3699/2008 άρχισε να υλοποιείται μια μορφή συνεργατικής διδασκαλίας, η οποία ονομάστηκε παράλληλη στήριξη. Σύμφωνα με αυτόν το νόμο, οι μαθητές με αναπηρία και ειδικές εκπαιδευτικές ανάγκες μπορούν να φοιτούν σε σχολική τάξη του γενικού σχολείου υποστηριζόμενοι από έναν επιπλέον εκπαιδευτικό. Οι αλλαγές στην εκπαίδευση των παιδιών με ειδικές ανάγκες επηρεάζουν σε μεγάλο βαθμό τους εκπαιδευτικούς, που εμπλέκονται άμεσα στις προσπάθειες εκπαίδευσης των μαθητών με ειδικές ανάγκες μέσα στο γενικό σχολείο ή στη συνηθισμένη πράξη. Η παρούσα εργασία επικεντρώνεται στις εμπειρίες των εκπαιδευτικών στην παράλληλη στήριξη και ενδιαφέρεται να προσδιορίσει τους προβληματισμούς που εκφράζουν ως προς την εφαρμογή της. Στην έρευνα συμμετείχαν 10 εκπαιδευτικοί της πρωτοβάθμιας εκπαίδευσης που έχουν εργαστεί στην παράλληλη στήριξη σε γενική τάξη, βοηθώντας παιδιά με ειδικές εκπαιδευτικές ανάγκες. Για τη συλλογή του υλικού διεξήχθηκαν συνεντεύξεις και η ανάλυσή του έγινε με τη μέθοδο της ποιοτικής ανάλυσης περιεχομένου. Τα αποτελέσματα ποικίλουν σύμφωνα με τις προσωπικές εμπειρίες του κάθε εκπαιδευτικού.
description: In Greece , with the enactment of Law 3699/2008 started a form of collaborative teaching, which is called “parallel support”. According to this law, students with disabilities and special educational needs can attend school class of mainstream school supported by an additional teacher. The changes in special education affect greatly teachers who are directly involved in education for students with special needs in mainstream school. This paper focuses on the experiences of teachers in “parallel support” and tries to explore the concerns of these teachers regarding to the application of “parallel support”. The survey involved 10 primary school teachers who have worked in parallel support in general classroom, helping children with special educational needs. Interviews were conducted in order to collect the material for the research and for the analysis was used the method of qualitative content analysis. The results vary according to personal experiences of each teacher.
Evolution of a reproductive character in 26 Neotropica anuran species
Creators: name: Leite, Gabriela
name: Franco-Belussi, Lilian
name: Provete, Diogo Borges
name: Classius De Oliveira
Publisher: name: F1000Research
Year: 2015

description: This presentation was given at the VII Symposim on Comparative Biology at Ribeirão Preto (http://sites.ffclrp.usp.br/ebc/). These results are part of a project on the evolution of anuran reproductive morphology.
Orthoptera Olivier 1789
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
name: Husemann, Martin
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera

description: Order Orthoptera Olivier, 1789  Suborder Caelifera Ander, 1939
description: Published as part of Gupta, Sunil Kumar, Chandra, Kailash & Husemann, Martin, 2019, An annotated checklist of the Indian species of the band-winged grasshopper genus Sphingonotus Fieber, 1852 (Orthoptera: Acrididae) with description of a new species, pp. 349-358 in Zootaxa 4604 (2) on page 350, DOI: 10.11646/zootaxa.4604.2.7, http://zenodo.org/record/2833177
Accretion and outflow activity in proto-brown dwarfs
Creators: name: Riaz, Basmah
name: Bally, John
Publisher: name: Zenodo
Year: 2021
Subjects: Very low mass stars

description: Mass accretion and ejection are the fundamental processes during the early stages of star formation. We have conducted the first extensive study of the accretion and outflow properties in Class 0/I proto-brown dwarfs (proto-BDs) using VLT SINFONI spectroscopy and spectro-imaging observations. The near-infrared spectra for the proto-BDs show prominent emission in the Paschen β, Brackett γ, Brackett 10–19, and several [FeII] and H2 lines. The detection of H2 lines from vibrational energy levels of ν = 1 to ν = 6 indicates the presence of both a cold (E(v,J) < 6000 K) and a hot gas component (E(v,J) > 20,000 K). The Class 0 proto-BDs show strong emission in the H2 lines but the [Fe II] lines are undetected, while the Class I objects show emission in both [Fe II] and H2 lines, suggesting an evolutionary trend in the jets from a molecular to an ionic composition. Extended emission with knots is seen in the [Fe II] and H2 spectro-images for 3 proto-BDs, while the rest show compact morphologies with a peak on-source. The peak velocities of the [Fe II] lines (≥100 km/s) are higher than the H2 lines (∼10-50 km/s), indicating that these lines trace different flow components. The accretion and outflow activity rates for the proto-BDs are in the range of (2×10−6 - 5×10−9) M⊙/yr. The outflow rate derived using the [Fe II] lines is at least an order of magnitude higher than H2 lines, indicating that [Fe II] traces a large fraction of the total outflow mass. A comparison with Class 0/I protostars indicates that there is no notable decline in the accretion and outflow activity or jet efficiencies over a wide range in bolometric luminosities from ~30 L⊙ down to ~0.03 L⊙.
description: {"references": ["Riaz & Bally, 2021, MNRAS, 501, 3781"]}
Sub-signature Operators and the Kastler-Kalau-Walze type theorem for manifolds with boundary
Creators: name: Wu, Tong
name: Wei, Sining
name: Wang, Yong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this paper, we obtain two Lichnerowicz type formulas for sub-signature operators. And we give the proof of Kastler-Kalau-Walze type theorems for sub-signature operators on 4-dimensional and 6-dimensional compact manifolds with (resp.without) boundary.
Spectroscopic analysis of accretion/ejection signatures in the Herbig Ae/Be stars
Creators: name: Moura, T
name: Alencar, S. H. P.
name: Sousa, A. P
Publisher: name: Zenodo
Year: 2021

description: Time series analysis of two high-resolution UVES / ESO spectra stars Herbig Ae/Be members of the young star cluster NGC 2264 with indications of sufficient circumstellar material so that the addition and ejection processes. Determination of stellar parameters with synthetic spectral adjustment, and study the variability of the emission lines and classified the circumstellar lines, such as Halpha, Hbeta, according to its morphologies. Halpha medium profile model, using a hybrid MHD model that includes a stellar magnetosphere and a disk wind,
Multicolour CCD Measurements of Visual Double and Multiple Stars. III
Creators: name: Lampens, P.
name: Strigachev, A.
name: Duval, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent CCD observations were performed in the period 1998-2004 for a large sample of visual double and multiple stars selected from the Hipparcos Catalogue and/or from the Gliese Catalogue of Nearby Stars. Accurate astrometric and photometric data allowing to characterize the individual components are provided. These data are confronted to Hipparcos data or to data from an older epoch in order to assess the nature of the observed systems. We simultaneously apply a Moffat-Lorentz profile with a similar shape to all detected components and adjust the profile parameters from which we obtain the relative astrometric position (epoch, position angle, angular separation) as well as differential multi-colour photometry (filters (B)VRI). We thus acquired recent data for 71 visual systems of which 6 are orbital binaries, 27 are nearby and 30 are multiple systems. In three cases, the systems remained unresolved. 23 new components were detected and measured. Two new visual double stars of intermediate separation were also found. The estimated accuracies in relative position are 0.04 deg and 0.01" respectively, while those in differential photometry are of the order of 0.01-0.02 mag in general. The nature of the association of 55 systems is evaluated. New basic binary properties are derived for 20 bound systems. Component colours and masses are provided for two orbital binaries.
description: 7 pages, 2 Postscript figures, 1 appendix, 1 annex containing 3 tables. Appendix A and Tables~4-6 are only available in electronic form. Astronomy and Astrophysics, in press (2006)
A Fourier type transform on translation invariant valuations on convex sets
Creators: name: Alesker, Semyon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: Let $V$ be a finite dimensional real vector space. In the article we construct an isomorphism between the space of smooth translation invariant valuations on convex subsets of $V$ and the space of such valuations (twisted by densities) on the dual space $V^*$. This isomorphism commutes with the natural action of the full linear group on both spaces of valuations, maps product on the source (introduced in arXiv:math/0301148) to the convolution on the target (introduced in arXiv:math/0607449), and satisfies a Plancherel type inversion formula. As an application, a version of the hard Lefschetz theorem for valuations is proved.
description: 85 pages; a mistake in Example 0.1.5 corrected
Γραμμική και μη-γραμμική λογική: σύγκριση και πρακτικές εφαρμογές:
Creators: name: Γουγλίδης, Αντώνιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Γραμμική λογική
Μη-γραμμική λογική
Έλεγχος μοντέλων
Linear time logic
Computation tree logic
Model checking

description: Η λογική και συγκεκριμένα η μαθηματική λογική αποτελεί έναν ιδιαίτερα ενδιαφέροντα κλάδο τόσο των μαθηματικών όσο και της επιστήμης της πληροφορικής, με ιδιαίτερα σημαντικές εφαρμογές στον έλεγχο ορθότητας μιας πληθώρας τύπου συστημάτων. Στην παρούσα διπλωματική εργασία παρουσιάζονται δύο βασικές χρονικές λογικές, οι LTL και CTL, που υποστηρίζονται από πολλές εφαρμογές ελέγχου μοντέλων. Στη συνέχεια γίνεται παρουσίαση των βασικών διαφορών μεταξύ των δύο χρονικών λογικών, όπως αυτές έχουν προσδιοριστεί από υπάρχουσες ερευνητικές εργασίες. Μέσω της σύγκρισης δίνεται η δυνατότητα στον αναγνώστη να επιλέξει κατά περίπτωση τη σωστή γλώσσα για την περιγραφή των προς έλεγχο ιδιοτήτων. Τέλος, δίνεται ένα παράδειγμα εφαρμογής της τεχνικής ελέγχου μοντέλων, το οποίο αφορά στον έλεγχο ιδιοτήτων LTL ή CTL σε πολιτικές ελέγχου πρόσβασης βασιζόμενες σε ρόλους.
description: Logic and specifically mathematical logic is an interesting sector of both mathematics and computer science, with important applications in checking the correctness of systems. In this dissertation, we present two fundamental temporal logics (i.e., LTL and CTL), which are supported by several model checkers. In turn, we present the main differences between the two temporal logics, as these are identified in the existing literature. Through the comparison the readers are given the opportunity to correctly choose the appropriate temporal logic depending on the type of properties required to be defined. Finally, we present an example of a model checking technique, which can be used to check the correctness of role based access control policies by verifying properties described in either LTL or CTL.
Performance Of A Liquid Argon Time Projection Chamber Exposed To The WANF Neutrino Beam
Creators: name: al., F. Arneodo et
Publisher: name: arXiv
Year: 2006
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the results of the first exposure of a Liquid Argon TPC to a multi-GeV neutrino beam. The data have been collected with a 50 liters ICARUS-like chamber located between the CHORUS and NOMAD experiments at the CERN West Area Neutrino Facility (WANF). We discuss both the instrumental performance of the detector and its capability to identify and reconstruct low multiplicity neutrino interactions.
description: 14 pages, 12 figures. Submitted for publication to Physical Review D
Ανάπτυξη και μελέτη γαλβανισμένων επικαλύψεων Zn με προσμείξεις Μg ή Αl, με ηλεκτρονική μικροσκοπία σάρωσης και περίθλαση ακτίνων Χ
Creators: name: Συρόπουλος, Βασίλειος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Γαλβανισμός
Επικάλυψη
Ψευδάργυρος
Galvanizing
Coating
Zinc

description: Σκοπός της εργασίας ήταν να διερευνηθεί ο τρόπος ανάπτυξης και η δομή της επικάλυψης, τόσο στην περίπτωση του κλασικού γαλβανισμού, όσο και σε δυο άλλες περιπτώσεις όπου η προσθήκη επιπλέον στοιχείων στο τήγμα Zn βελτιώνει τις ιδιότητες της επικάλυψης. Έτσι λοιπόν, παρασκευάστηκαν 11 δοκίμια, από τα οποία τα 5 είχαν ως επικάλυψη Zn100% με χρόνους εμβάπτισης από 30sec έως 2.5min, τα 3 είχαν ως επικάλυψη Zn90% - Μg10% με χρόνους εμβάπτισης 1,2 και 3min και τέλος παρασκευάστηκαν 3 δοκίμια με επικάλυψη Zn90% - Al10% με χρόνους εμβάπτισης 1,2 και 3min. Τα δείγματα αυτά, καθώς και ένα πρότυπο δείγμα Zn100% (t=2min), μελετήθηκαν κυρίως με ηλεκτρονική μικροσκοπία σάρωσης (SEM), αλλά και με περίθλαση ακτίνων Χ (XRD) όπου ήταν αναγκαίο.
description: The purpose of this study was to investigate the growth mode and the structure of the coating, as in the case of conventional galvanizing, and in two other cases where adding extra elements in the melt of Zn improves the properties of the coating. For this purpose, 11 samples were prepared, of which 5 were coated with Zn100% with immersion times of 30sec to 2.5min, 3 were coated with Zn90% - Mg10% with immersion times 1,2 and 3min and 3 samples were prepared with coating Zn90% - Al10% with immersion times of 1,2 and 3min. These samples and a standard sample of Zn100% (t = 2min), mainly studied with scanning electron microscopy (SEM), and X-ray diffraction (XRD) where necessary.
description: Σε συνεργασία με το Ινστιτούτο Τεχνολογίας Γκρενόμπλ (Γαλλία), το ΕΚΕΦΕ Δημόκριτος, και το CNRS (Centre National de la Researche Scientifique, Γαλλία)