cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evidence for Metallicity-Dependant Spin Evolution in the Kepler field
Creators: name: Amard, L.
name: Roquette, J.
name: Matt, S. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A curious rotation period distribution in the Color-Magnitude-Period Diagram (CMPD) of the Kepler field was recently revealed, thanks to data from Gaia and Kepler spacecraft. It was found that redder and brighter stars are spinning slower than the rest of the main sequence. On the theoretical side, it was demonstrated that metallicity should affect the rotational evolution of stars as well as their evolution in the Hertzprung-Rüssel or Color-Magnitude diagram. In this work we combine this dataset with medium and high resolution spectroscopic metallicities and carefully select main sequence single stars in a given mass range. We show that the structure seen in the CMPD also corresponds to a broad correlation between metallicity and rotation, such that stars with higher metallicity rotate on average more slowly than those with low metallicity. We compare this sample to theoretical rotational evolution models that include a range of different metallicities. They predict a correlation between rotation rate and metallicity that is in the same direction and of about the same magnitude as that observed. Therefore metallicity appears to be a key parameter to explain the observed rotation period distributions. We also discuss a few different ways in which metallicity can affect the observed distribution of rotation period, due to observational biases and age distributions, as well as the effect on stellar wind torques.
description: 13 pages, 10 figures
High dimensional density estimation with sparse grids
Creators: name: Wilson, Padarn George
Publisher: name: The Australian National University
Year: 2015

description: Density estimation is a classical and well studied problem in modern statistics. In the case of low dimensional problems there are a wide array of well understood and efficient non-parametric methods in the existing literature. In contrast, high dimensional density estimation remains a very challenging problem in this field. As the dimension of the variable space increases there is an exponential growth in both the computational complexity of the problem and in the required sample size. This is a fundamental difficulty, and no single technique can avoid it altogether. Instead, techniques must be developed that take advantage of problem specific information or simplifying assumptions. In this thesis we study a particularly relevant situation in modern statistics, in which there is a large quantity of data and the underlying dimension of the problem is reasonably high. In this situation, the most flexible methods are too computationally expensive, and specification of reasonable parametric models becomes too difficult. We propose a range of techniques which utilize the concept of Sparse Grids. This is a technique that exploits additional regularity assumptions to allow a more efficient grid based representation of a function. This grid like approach allows an efficient treatment of massive data sets, while still possessing a reasonable degree of flexibility. We present different options for estimating density functions using a Sparse Grid. These estimators are examined first through a systematic study of the estimators theoretical properties, then through numerical examples of their real world performance and computational feasibility.
Μελέτη της στρατηγικής περάσματος εμποδίου σε ασθενείς με νόσο Πάρκινσον:
Creators: name: Καρρά, Μαγδαληνή Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Νόσος Πάρκινσον
Βηματισμός
Πέρασμα εμποδίου
Parkinson's disease
Gait
Passing obstacles

description: Ο σκοπός της έρευνάς μας, που πραγματοποιήθηκε στο εργαστήριο προπονητικής και αθλητικής απόδοσης του Τ.Ε.Φ.Α.Α –Α.Π.Θ, ήταν η μελέτη και η σύγκριση των κινηματικών και δυναμικών χαρακτηριστικών των κάτω άκρων ,κατά τη διάρκεια του κάθετου περάσματος εμποδίου σε παρκινσονικούς ασθενείς και υγιείς. Μετρήθηκαν δυο γκρουπ, το ένα αποτελούνταν από 8 άνδρες και γυναίκες ηλικίας 60-70 χρόνων ,με νόσο Πάρκινσον και το άλλο αποτελούνταν από υγιείς άνδρες και γυναίκες της ίδιας ηλικίας.Μελετήθηκε η στρατηγική περάσματος εμποδίου και τα κινηματικά χαρακτηριστικά δεδομένα του κύκλου βάδισης στις 2 δυο αρθρώσεις (γόνατος & ποδοκνημικής), στα 3 ύψη (0%,10% και 20%), που αντιστοιχούσε στο 0%,10% και 20% του μήκους του άκρου ποδός του εξεταζόμενου. Τα αποτελέσματά μας έδειξαν, ότι τα σταθερά εμφανιζόμενα εμπόδια δεν τροποποιούν και δε βελτιώνουν τα κινητικά πρότυπα περάσματος των παρκινσονικών, όπως συμβαίνει στα ξαφνικά εμφανιζόμενα εμπόδια Ουσιαστικά οι παρκινσονικοί διατηρούν το παθολογικό πρότυπο βάδισης. Αυτό στηρίζεται από τα δυναμικά χαρακτηριστικά της βάδισης, τις αποστάσεις και τους χρόνους διέλευσης εμποδίου, από το ύψος περάσματος εμποδίου και από τις γωνίες του γόνατος και της ποδοκνημικής
description: The purpose of this research, which was conducted in the laboratory of training and athletic performance of the faculty of Physical Education in the Aristotle University of Thessaloniki, was to study and compare the kinematic and dynamic characteristics of lower limbs during the vertical movement over an obstacle in healthy and Parkinson’s disease patients. Two groups were measured, one consisting of 8 male and female Parkinson’s patients aged 60-70, and the other consisting of healthy men and women of the same age. What was also examined was the strategy of passing an obstacle and the standard kinematic characteristics of gait cycle in the two joints (knee and ankle), in 3 heights (0%,10% and 20%), which correspond to 0%,10% and 20% of the leg length of the people examined.The results indicated that the occurring stable obstacles do not change and improve the kinematic standards of passing in Parkinsonians, as it happens in suddenly occurring obstacles. In fact, Parkinsonians maintain the pathological gait standard. This is based on the dynamic gait characteristics, the distances and the time of passing over the obstacle, the height of passing over the obstacle and the angles of knee and ankle.
Hexapanopeus caribbaeus
Creators: name: Mantelatto, Fernando L.
name: Tamburus, Ana Francisca
name: Magalhães, Tatiana
name: Buranelli, Raquel C.
name: Terossi, Mariana
name: Negri, Mariana
name: Castilho, Antonio L.
name: Costa, Rogério C.
name: Zara, Fernando J.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Panopeidae
Hexapanopeus
Hexapanopeus caribbaeus

description: Hexapanopeus caribbaeus (Stimpson, 1871)
(Figure 20C)
Micropanope caribbaeus Stimpson, 1871: 108.
Material examined. Brazil, São Paulo: 1 ♂, CCDB 5669, Ubatuba, colls. F. Mantelatto et al., 20.x.2012; 1 ♂, CCDB 5658, Ilha Vitoria, Ubatuba, colls. F. Mantelatto et al., 20.x.2012; 8 ♂, 2 ♀ (1 ♀ ov), 1 j, CCDB 5672, Ubatuba, colls. F. Mantelatto et al., 19.x.2010; 7 ♂, 3 ♀ (1 ♀ ov), 3 j, CCDB 5674, Ubatuba, colls. F. Mantelatto et al., 01.xii.2014; 1 ♂, CCDB 5681, Ubatuba, colls. F. Mantelatto et al., 19.x.2012; 2 ♂, CCDB 5881, Ilhabela, colls. F. Zara et al., 10.ix.2013.
Distribution. Western Atlantic—USA (Florida), Antilles, north of South America, and Brazil (Piauí, Paraíba, Pernambuco, Alagoas, Bahia, São Paulo, Santa Catarina, Rio Grande do Sul) (Coelho & Ramos 1972; Abele & Kim 1986; Almeida et al. 2007b; Coelho et al. 2008; Felder et al. 2009; Vieira & Calazans 2010).
Remarks. Previous records on the coast of São Paulo include Ubatuba (Alves et al. 2012b) and Ilha Vitória (Alves et al. 2012a).
description: Published as part of Mantelatto, Fernando L., Tamburus, Ana Francisca, Magalhães, Tatiana, Buranelli, Raquel C., Terossi, Mariana, Negri, Mariana, Castilho, Antonio L., Costa, Rogério C. & Zara, Fernando J., 2020, Checklist of decapod crustaceans from the coast of the São Paulo state (Brazil) supported by integrative molecular and morphological data: III. Infraorder Brachyura Latreille, 1802, pp. 1-108 in Zootaxa 4872 (1) on page 73, DOI: 10.11646/zootaxa.4872.1.1, http://zenodo.org/record/4423421
Impact of Rubin Observatory cadence choices on supernovae photometric classification
Creators: name: Alves, Catarina S.
name: Peiris, Hiranya V.
name: Lochner, Michelle
name: McEwen, Jason D.
name: Kessler, Richard
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will discover an unprecedented number of supernovae (SNe), making spectroscopic classification for all the events infeasible. LSST will thus rely on photometric classification, whose accuracy depends on the not-yet-finalized LSST observing strategy. In this work, we analyze the impact of cadence choices on classification performance using simulated multi-band light curves. First, we simulate SNe with an LSST baseline cadence, a non-rolling cadence, and a presto-color cadence which observes each sky location three times per night instead of twice. Each simulated dataset includes a spectroscopically-confirmed training set, which we augment to be representative of the test set as part of the classification pipeline. Then, we use the photometric transient classification library snmachine to build classifiers. We find that the active region of the rolling cadence used in the baseline observing strategy yields a 25% improvement in classification performance relative to the background region. This improvement in performance in the actively-rolling region is also associated with an increase of up to a factor of 2.7 in the number of cosmologically-useful Type Ia supernovae relative to the background region. However, adding a third visit per night as implemented in presto-color degrades classification performance due to more irregularly sampled light curves. Overall, our results establish desiderata on the observing cadence related to classification of full SNe light curves, which in turn impacts photometric SNe cosmology with LSST.
description: 22 pages, 14 figures. Changed to match version accepted by the Astrophysical Journal Supplement Series (accepted 06/02/2023)
Η αντιμετώπιση των προβλημάτων μάθησης μέσα από τη διδασκαλία αναλυτικών μεθόδων επεξεργασίας: η περίπτωση της επίλυσης προβλημάτων στα μαθηματικά του δημοτικού σχολείου
Creators: name: Δαραής, Κωνσταντίνος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Αναλυτικές μέθοδοι επεξεργασίας
Μαθηματικό πρόβλημα
Διδασκαλία σε ομάδες
Δυσκολίες μάθησης
Teaching of analytical methods of process
Problem solving
Teaching in groups
Learning difficulties

description: Η εργασία πραγματεύεται το θέμα της διδασκαλίας αναλυτικών μεθόδων επεξεργασίας των μαθηματικών λεκτικών προβλημάτων μέσα από την οργάνωση των μαθητών της τάξης σε ομάδες. Υλοποιήθηκε σε μια στ' τάξη δημοτικού σχολείου και αξιολόγησε την πρόοδο των μαθητών τόσο με ποιοτικά όσο και ποσοτικά κριτήρια με αναφορά στη βελτίωση των μαθητών απέναντι στο μαθηματικό λεκτικό πρόβλημα
description: The topic of this thesis is the teaching of analytical methods and its role in mathematical problem solving. The compilation of its main corpus was based on a teaching whic took place in a 6th grade of a primary school. The assessement of the data of this field research is both qualitative and quantitative
Hadronic resonance production in $d$+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV at RHIC
Creators: name: Abelev, B. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the first measurements of the $ρ(770)^0$, $K^*$(892), $Δ$(1232)$^{++}$, $Σ$(1385), and $Λ$(1520) resonances in $d$+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV, reconstructed via their hadronic decay channels using the STAR detector at RHIC. The masses and widths of these resonances are studied as a function of transverse momentum ($p_T$). We observe that the resonance spectra follow a generalized scaling law with the transverse mass ($m_T$). The $$ of resonances in minimum bias collisions is compared to the $$ of $π$, $K$, and $\bar{p}$. The $ρ^0/π^-$, $K^*/K^-$, $Δ^{++}/p$, $Σ(1385)/Λ$, and $Λ(1520)/Λ$ ratios in $d$+Au collisions are compared to the measurements in minimum bias $p+p$ interactions, where we observe that both measurements are comparable. The nuclear modification factors ($R_{dAu}$) of the $ρ^0$, $K^*$, and $Σ^*$ scale with the number of binary collisions ($N_{bin}$) for $p_T >$ 1.2 GeV/$c$.
description: STAR Collaboration. Submitted to PRC
Role of NiO in the nonlocal spin transport through thin NiO films on Y$_3$Fe$_5$O$_{12}$
Creators: name: Hoogeboom, Geert R.
name: Nicolaas, Geert-Jan N. Sint
name: Alexander, Andreas
name: Kuschel, Olga
name: Wollschläger, Joachim
name: Ennen, Inga
name: van Wees, Bart J.
name: Kuschel, Timo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In spin transport experiments with spin currents propagating through antiferromagnetic (AFM) material, the antiferromagnet is treated as a mainly passive spin conductor not generating nor adding any spin current to the system. The spin current transmissivity of the AFM NiO is affected by magnetic fluctuations, peaking at the Néel temperature and decreasing by lowering the temperature. In order to study the role of the AFM in local and nonlocal spin transport experiments, we send spin currents through NiO of various thickness placed on Y$_3$Fe$_5$O$_{12}$. The spin currents are injected either electrically or by thermal gradients and measured at a wide range of temperatures and magnetic field strengths. The transmissive role is reflected in the sign change of the local electrically injected signals and the decrease in signal strength of all other signals by lowering the temperature. The thermally generated signals, however, show an additional upturn below 100$\,$K which are unaffected by an increased NiO thickness. A change in the thermal conductivity could affect these signals. The temperature and magnetic field dependence is similar as for bulk NiO, indicating that NiO itself contributes to thermally induced spin currents.
Magnetocentrifugal Winds in 3D: Nonaxisymmetric Steady State
Creators: name: Anderson, Jeffrey M.
name: Li, Zhi-Yun
name: Krasnopolsky, Ruben
name: Blandford, Roger D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Outflows can be loaded and accelerated to high speeds along rapidly rotating, open magnetic field lines by centrifugal forces. Whether such magnetocentrifugally driven winds are stable is a longstanding theoretical problem. As a step towards addressing this problem, we perform the first large-scale 3D MHD simulations that extend to a distance $\sim 10^2$ times beyond the launching region, starting from steady 2D (axisymmetric) solutions. In an attempt to drive the wind unstable, we increase the mass loading on one half of the launching surface by a factor of $\sqrt{10}$, and reduce it by the same factor on the other half. The evolution of the perturbed wind is followed numerically. We find no evidence for any rapidly growing instability that could disrupt the wind during the launching and initial phase of propagation, even when the magnetic field of the magnetocentrifugal wind is toroidally dominated all the way to the launching surface. The strongly perturbed wind settles into a new steady state, with a highly asymmetric mass distribution. The distribution of magnetic field strength is, in contrast, much more symmetric. We discuss possible reasons for the apparent stability, including stabilization by an axial poloidal magnetic field, which is required to bend field lines away from the vertical direction and produce a magnetocentrifugal wind in the first place.
description: 10 pages, 2 figures, accepted for publication in ApJL
Connecting the formation of stars and planets. I -- Spectroscopic characterization of host stars with TIGRE
Creators: name: Flor-Torres, L. M.
name: Coziol, R.
name: Schröder, K. -P.
name: Jack, D.
name: Schmitt, J. H. M. M.
name: Blanco-Cuaresma, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In search for a connection between the formation of stars and the formation of planets, a new semi-automatic spectral analysis method using \textsf{iSpec} was developed for the TIGRE telescope installed in Guanajuato, Mexico. TIGRE is a 1.2m robotic telescope, equipped with an Echelle spectrograph (HEROS), with a resolution R $\simeq 20000$. \textsf{iSpec} is a synthetic spectral fitting program for stars that allows to determine in an homogeneous way their fundamental parameters: effective temperature, $T_{\rm eff}$, surface gravity, $\log g$, metallicities, $[M/H]$ and $[Fe/H]$, and rotational velocity, $V \sin i$. In this first article we test our method by analysing the spectra of 46 stars, host of exoplanets, obtained with the TIGRE.
description: Accepted for publication in RevMexAA
The use of a railgun facility for dynamic fracture of brittle materials.
Creators: Schneider, Markus
Vincent, Gregory
Hogan, James D.
Spray, John G.
Publisher: name: University of Alberta Library
Year: 2015

Linear electromagnetic acceleration has a wide range of applications. Among them are applications in the field of materials

science where relatively small, inexpensive systems can be of high value. For instance, it was shown recently at the French-German Institute of Saint Louis (ISL), France, that the symmetric Taylor test – a method to investigate the deformation behaviour of specimens at high deformation rates- can be realized with higher precision than attainable with other acceleration methods by using a railgun with velocity control. In this work, we present another example for an application of a railgun in the field of materials science, namely the study of impact phenomena and terminal ballistics. One of the major advantages of railgun technology is that the acceleration profile can be well defined at velocity ranges from very low speeds (< 10 m/s) up to more than 2000 m/s – for one and the same launcher. Moreover, the geometry of a railgun projectile

can be round, rectangular or, as in the case discussed here, hexagonal. Finally, electromagnetic acceleration does not require

the use of propellants, which in the case of impact experiments could lead to complications – at least for the experimental

application presented. The quest is to study the ejecta field of fractured brittle materials at moderate impact velocities (< 500

m/s). It transpires that a railgun can be a valuable tool for such investigations. Using high-speed cameras and novel data processing methods ejecta distribution-velocity relations are explored. Our contribution describes the experimental setup used and will introduce some of the major results obtained so far.
Έρευνα του υδατικού δυναμικού και των δυνατοτήτων αξιοποίησης του χείμαρρου "Ποταμούλι" Ν.Γρεβενών:
Creators: name: Παντοπούλου, Στεργιανή Παντελή
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Υδατικό δυναμικό
Χειμαρρικό περιβάλλον
Αξιοποίηση
Διαχείριση
Ταμίευση
Πλημμυρική αιχμή
Water supply
Torrential environment
Utilise
Managing
Water thrift
Avalanche point

description: Το νερό είναι ένα από τα βασικά "κοινωνικά αγαθά", αποτελεί αναπόσπαστο τμήμα του οικοσυστήματος μέσα στο οποίο ζει ο άνθρωπος αλλά και ουσιώδες χαρακτηριστικό του φυσικού περιβάλλοντος. Η συνεχής αύξηση του πλυθησμού και η μεγάλη βιομηχανική ανάπτυξη έχουν οδηγήσει στην υπερβολική εκμετάλλευση των φυσικών πόρων, με συνέπεια την εξάντληση τους και την καταστροφή τους. Στο επίκεντρο αυτών των εντατικών εκμεταλλεύσεων, τα τελευταία χρόνια, βρίσκεται και το υδατικό δυναμικό. Αντικείμενο της παρούσας μεταπτυχιακής διατριβής είναι: "Η διερεύνηση των δυνατοτήτων βέλτιστης χωροχρονικής διαχείρισης του υδατικού δυναμικού του χειμάρρου Ποταμούλι με χειμαρρικά, περιβαλλοντικά, δασικά και κοινωνικά κριτήρια. Από τα αντικείμενα της παρούσας διατριβής προκύπτει ότι βασικοί στόχοι της είναι ο προσδιορισμός των μορφομετρικών χαρακτηριστικών, των βασικών παραγόντων που καθορίζουν το χειμαρρικό περιβάλλον της λεκάνης απορροής και η ανάπτυξη τρόπων αξιοποίησης του υδατικού πλεονάσματος του χειμάρου. Αρα βασικό στοιχείο του συστήματος ορθολογικής διαχείρισης των υδατικών πόρων του χειμμάρου Ποταμούλι είναι η ελεγχόμενη ταμίευη και αξιοποίηση του καταστροφικού τμήματος των πλημμυρικών αιχμών.
description: Water is one of the most basic public and common goods, and it constitutes an inseparable part of any ecosystem humans live in. Moreover, it is an essential element of the natural environment. The constant population growth and the vast industrial development have led to the excessive exploitation of the natural resources, resulting their exhaustion and destruction. Among the targets of this intensive exploitation are also our planet's water supplies. The topic of this dissertation paper is "Researching the possibilities of efficient chorochronic management of the Potamouli torrent water supply, using torrential, forestal and social criteria. The objectives of the dissertation are the definition of the morphometric characteristics, the definition of the basis factors that determine the torrential environment of the emanation basin, and the suggestion of utilizing methods of the water surplus of the torrent. As it is clear, the basic element for rationally managing the water supplies of the Potamouli torrent, is the controlled and regulated water thrift and the utilisation of the catastrophic part of the avalanche points.
Quantum Spectra of Hydrogen Atoms in Various Magnetic Fields with the Closed Orbit Theory
Creators: name: Peng, Liang-You
name: Zhang, Xian-Zhou
name: Rao, Jian-Guo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The quantum spectra of hydrogen atoms in various magnetic fields have been calculated with the closed orbit theory. The magnitude of the magnetic field decreases from 5.96 T to 0.56T with a step of 0.6T. We demonstrate schematically that the closed orbits disappear with the decrease of the magnitude of the magnetic field when the corresponding finite resolution of experiment is fixed. This may give us a good way to control the shape and the number of the closed orbits in the system, and thus to control where a peak should exist in the Fourier transformation of the quantum spectra.
description: 4 pages
Modified iterated Tikhonov methods for solving systems of nonlinear ill-posed equations
Creators: name: Baumeister, J.
name: De Cezaro, A.
name: Leitao, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65J20, 47J06

description: We investigate iterated Tikhonov methods coupled with a Kaczmarz strategy for obtaining stable solutions of nonlinear systems of ill-posed operator equations. We show that the proposed method is a convergent regularization method. In the case of noisy data we propose a modification, the so called loping iterated Tikhonov-Kaczmarz method, where a sequence of relaxation parameters is introduced and a different stopping rule is used. Convergence analysis for this method is also provided.
description: 18 pages. arXiv admin note: text overlap with arXiv:0801.3088, arXiv:2011.09674
Asymptotic analysis of random matrices with external source and a family of algebraic curves
Creators: name: McLaughlin, K. D. T-R
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a set of conditions which, if satisfied, provide for a complete asymptotic analysis of random matrices with source term containing two distinct eigenvalues. These conditions are shown to be equivalent to the existence of a particular algebraic curve. For the case of a quartic external field, the curve in question is proven to exist, yielding precise asymptotic information about the limiting mean density of eigenvalues, as well as bulk and edge universality.
Probing Nuclear Matter with Jet Conversions
Creators: name: Liu, W.
name: Fries, R. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the flavor of leading jet partons as a valuable probe of nuclear matter. We point out that the coupling of jets to nuclear matter naturally leads to an alteration of jet chemistry even at high transverse momentum $p_T$. In particular, QCD jets coupling to a chemically equilibrated quark gluon plasma in nuclear collisions, will lead to hadron ratios at high transverse momentum $p_T$ that can differ significantly from their counterparts in $p+p$ collisions. Flavor measurements could complement energy loss as a way to study interactions of hard QCD jets with nuclear matter. Roughly speaking they probe the inverse mean free path $1/λ$, while energy loss probes the average squared momentum transfer $μ^2/λ$. We present some estimates for the rate of jet conversions in a consistent Fokker-Planck framework and their impact on future high-$p_T$ identified hadron measurements at RHIC and LHC. We also suggest some novel observables to test flavor effects.
description: 12 pages, 11 figures, version to appear in PRC
Provably robust blind source separation of linear-quadratic near-separable mixtures
Creators: name: Kervazo, Christophe
name: Gillis, Nicolas
name: Dobigeon, Nicolas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: Image and Video Processing (eess.IV)
subject: Machine Learning (stat.ML)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this work, we consider the problem of blind source separation (BSS) by departing from the usual linear model and focusing on the linear-quadratic (LQ) model. We propose two provably robust and computationally tractable algorithms to tackle this problem under separability assumptions which require the sources to appear as samples in the data set. The first algorithm generalizes the successive nonnegative projection algorithm (SNPA), designed for linear BSS, and is referred to as SNPALQ. By explicitly modeling the product terms inherent to the LQ model along the iterations of the SNPA scheme, the nonlinear contributions of the mixing are mitigated, thus improving the separation quality. SNPALQ is shown to be able to recover the ground truth factors that generated the data, even in the presence of noise. The second algorithm is a brute-force (BF) algorithm, which is used as a post-processing step for SNPALQ. It enables to discard the spurious (mixed) samples extracted by SNPALQ, thus broadening its applicability. The BF is in turn shown to be robust to noise under easier-to-check and milder conditions than SNPALQ. We show that SNPALQ with and without the BF postprocessing is relevant in realistic numerical experiments.
description: 23 pages + 24 pages of Appendix containing the proofs
ARIANNA: A New Concept for UHE Neutrino Detection
Creators: name: Barwick, Steven W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The ARIANNA concept utilizes the Ross Ice Shelf near the coast of Antarctica to increase the sensitivity to cosmogenic neutrinos by roughly an order of magnitude when compared to the sensitivity of existing detectors and those under construction. Therefore, ARIANNA can test a wide variety of scenarios for GZK neutrino production, and probe for physics beyond the standard model by measuring the neutrino cross-section at center of momentum energies near 100 TeV. ARIANNA capitalizes on several remarkable properties of the Ross Ice Shelf: shelf ice is relatively transparent to electromagnetic radiation at radio frequencies and the water-ice boundary below the shelf creates a good mirror to reflect radio signals from neutrino interactions in any downward direction. The high sensitivity results from nearly six months of continuous operation, low energy threshold (~3x10^17 eV), and more than 2*pi of sky coverage. The baseline concept for ARIANNA consists of moderately high gain antenna stations arranged on a 100 x 100 square grid, separated by about 300m. Each station consists of a small group of cross-polarized antennas residing just beneath the snow surface and facing downwards. They communicate with a central control hub by wireless links to generate global triggers.
description: 8 pages, 6 figures, 1 table, 28 references: submitted to Proceedings of 2nd Workshop on TeV Astrophysics, Aug 28-31, 2006, Madison, WI
The troublesome woman : a study of Barbara Pym's novels and short stories
Creators: name: Joyce, Robin Rosemary
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: PR6066.Y58 J69 2012
subject: Pym, Barbara Criticism and interpretation.
subject: Literature and society History 20th century.Great Britain
subject: Women and literature History 20th century.Great Britain
subject: Feminism in literature

description: This dissertation offers a revisionist account of Barbara Pym's fiction written between 1935 and 1979. It is an analysis of Pym's published work and unpublished manuscripts. The thesis contends that Pym's writing has a significant feminist dimension in the way it represents women characters and challenges conventions about women's role. Pym was a consummate observer. It is argued that, consciously or unconsciously, she interpreted her observations from a feminist perspective. Unlike post-1970s writers, she was ill equipped to place her observations into a feminist framework. Their familiarity with a body of feminist theory gave their work recognisable markers through which to interpret their feminist understandings. Re-reading Pym's work through some of those understandings demonstrates that, although she has no apparent feminist framework, many of the issues she raises and the way in which she approaches them, are feminist. It is argued that Pym continues some of Jane Austen's practices in her use of irony and mockery; confounding expectations of male and female behaviour; uttering truisms to highlight inconsistencies in behaviour; and using a conforming woman to contrast with a troublesome woman. This thesis argues that the arguments for a feminist re-reading of Austen's work are legitimately applied to re-reading Pym's texts. Until the 1970s, Pym also wrote subversive texts in inhospitable circumstances. The familiar conservative village setting or context for much of her fiction is a cover for the challenging exploration of the unequal nature of relationships between women and men. In the reception of Pym's fiction, the village has often been mistaken for the whole interest of the work. This thesis contends that Pym's techniques provided a cosy cover for representations of women and men that disturbed conventional pieties about marriage and women's social role. Pym would not describe herself as a feminist writer. However, Pym gives women's stories credibility, supports the notion of spinsters who choose to remain unmarried and observes friendships between women and realises them in her fiction. Pym's work is examined against feminist criteria. She gives what I refer to as the ""troublesome woman"" a central place in her narratives; her work destabilises the argument that women have inherently different characteristics from men and that nurturing is central to women's lives; binary feminist ideas are a recurring feature; and she features some aspects of the politics of difference. Pym's work is also compared with Fay Weldon and Zoe Fairbairns' acknowledged feminist work. Pym's feminist approach culminates in her 1970s novels, An Academic Question and Quartet in Autumn. --provided by Candidate.
Key Advantages of using Wearable Technology to Track your Health
Creators: name: Haruna G. R.
name: Aminu A.U.
name: N. A. Sulaiman
name: M. A. Baballe
Publisher: name: gjrpublication
Year: 2024

description: These vital signs can be tracked by wearable sensors, which can also be used to assess patients' health. As a result, they can be very beneficial to patients and healthcare professionals in the diagnosis of diseases, particularly when it comes to taking a patient's body temperature in infectious disorders.
The properties of 70micron selected high-redshift galaxies in the Extended Groth Strip
Creators: name: Symeonidis, M.
name: Willner, S. P.
name: Rigopoulou, D.
name: Huang, J. -S.
name: Fazio, G. G.
name: Jarvis, M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the infrared properties of 43 high redshift (0.135 and for a large fraction (~50 per cent) the SED turns over into the Rayleigh-Jeans regime at wavelengths longward of 90 microns. For comparison, we also fit semi-empirical templates based on local galaxy data, however, these underestimate the far-infrared SED shape by a factor of at least 2 and in extreme cases up to 10 for the majority (~70 per cent) of the sources. Further investigation of SED characteristics reveals that the mid-infrared (70/24 microns) continuum slope is decoupled from various galaxy properties such as the total infrared luminosity and far-infrared peak, quantified by the L_160/L_70 ratio. In view of these results, we propose that these high-redshift galaxies have different properties to their local counterparts, in the sense that large amounts of dust cause heavy obscuration and are responsible for an additional cold emissive component, appearing as a far-infrared excess in their SEDs.
description: 15 pages, 11 figures and 3 tables; accepted for publication in MNRAS
Ultrafast creation and melting of nonequilibrium excitonic condensates in bulk WSe$_{2}$
Creators: name: Perfetto, E.
name: Stefanucci, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the screened dynamics of the nonequilibrium excitonic consensate forming in a bulk WSe$_{2}$ when illuminated by coherent light resonant with the lowest-energy exciton. Intervalley scattering causes electron migration from the optically populated K valley to the conduction band minimum at $Σ$. Due to the electron-hole unbalance at the K point a plasma of quasi-free holes develops, which efficiently screens the interaction of the remaining excitons. We show that this plasma screening causes an ultrafast melting of the nonequilibrium consensate and that during melting coherent excitons and quasi-free electron-hole pairs coexist. The time-resolved spectral function does exhibit a conduction and excitonic sidebands of opposite convexity and relative spectral weight that changes in time. Both the dependence of the time-dependent conduction density on the laser intensity and the time-resolved spectral function agree with recent experiments.
description: 10 pages, 9 figures
Distributions of image quality metrics in the MRIQC Web-API
Creators: name: Nielson, Dylan
name: Zhang, Charles
name: Esteban, Oscar
name: Gorgolewski, Krzysztof
name: Halchenko, Yaroslav
name: Ghosh, Satrajit
name: Bandettini, Peter
name: Thomas, Adam
Publisher: name: Zenodo
Year: 2019

description: Automated quality metrics on ~283,000 MRI scans are publicly available Analysis of these quality metrics reveals complex structure related to scanner model, manufacturer, and field strength Flip angle is important for T1w image quality metrics Scanner manufacturer is important for BOLD image quality metrics
Συγκέντρωση οργανικής ουσίας στην επιφάνεια του εδάφους δασών πεύκης 16 ως 25 χρόνια μετά από πυρκαγιά:
Creators: name: Αραμπατζής, Νικόλαος Αστέριου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Δασικός τάπητας
Οργανική ουσία
Συσσώρευση θρεπτικών στοιχείων
Δασικές πυρκαγιές
Χαλέπιος πεύκη
Θαλάσσια πεύκη
Forest floor
Organic matter
Nutrient accumulation
Forest fires
Pinus halepensis
Pinus maritima

description: Σκοπός της παρούσας έρευνας ήταν να μελετήσει το δασικό τάπητα σε τέσσερα νέα σχετικά δασικά οικοσυστήματα πεύκης του νομού Χαλκιδικής, τα οποία είχαν καεί 16 ως 25 χρόνια πριν. Ως περιοχές έρευνας επιλέχθηκαν δάση χαλεπίου πεύκης στη Χανιώτη και Αγία Παρασκευή που είχαν καεί πριν 25 έτη, δάσος χαλεπίου πεύκης στο Γομάτι που είχε καεί πριν 16 έτη και ένα δάσος στο Πόρτο Κουφό που είχε καεί πριν 21 έτη και αναδασώθηκε με θαλάσσια πεύκη. Μετρήθηκε η ποσότητα του δασικού τάπητα και της οργανικής ουσίας και οι ποσότητες των θρεπτικών στοιχείων και στους δυο οργανικούς ορίζοντες (Αοο και Αο), καθώς και το είδος του εδάφους που αναπτύχθηκαν τα δάση της πεύκης μετά την πυρκαγιά. Οι συστάδες πεύκης δεν παρουσίασαν σημαντικές διαφορές στη συσσώρευση δασικού τάπητα και στη συγκέντρωση οργανικής ουσίας, σε σχέση με τις περιοχές έρευνας. Στην περιοχή της Χανιώτης συσσωρεύτηκαν μεγαλύτερες ποσότητες των θρεπτικών στοιχείων Ν, P, K και Ca, σε σχέση με τις υπόλοιπες περιοχές έρευνας. Η φύση του μητρικού πετρώματος (μάργες) επηρέασε τη συσσώρευση Ca στο δασικό τάπητα στη Χανιώτη και την Αγία Παρασκευή, ενώ στο μικρό βάθος του εδάφους οφείλεται η μικρή συσσώρευση δασικού τάπητα στο Γομάτι και στο Πόρτο Κουφό.
description: The aim of this research was to study the forest floor of four, relatively new, forest ecosystems of pine at Chalkidiki that had been burned 16 to 25 years ago. Forests of Pinus halepensis at Chanioti and Agia Paraskevi that had been burned 25 years ago, forest of Pinus halepensis at Gomati that had been burned 16 years ago and forest at Porto Koufo that had been burned 21 years ago and was reforested with Pinus maritima, were defined as study areas. Forest floor, organic matter and nutrient accumulation were measured in both organic layers (Αοο και Αο), as well as the soil type where pine forests were developed postfire. Pine forests did not had significant differences in forest floor and organic matter accumulation, concerning the study areas. At Chanioti the accumulations of Ν, P, K and Ca were increased, compared to the other study areas. The nature of maternal rock (marls) influenced the accumulation of Ca in the forest floor at Chanioti and Agia Paraskevi, while the small depth of soil is responsible for the small accumulation of forest floor at Gomati and Porto Koufo.
Based-nonequilibrium-environment non-Markovianity, quantum Fisher information and quantum coherence
Creators: name: Lin, Danping
name: Zou, Hong-Mei
name: Yang, Jianhe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, we investigate the non-Markovianity, quantum Fisher information (QFI) and quantum coherence of a qubit in a nonequilibrium environment and have obtained the expressions of QFI and quantum coherence as well as their relationship. We have also discussed in detail the influences of the different noise parameters on these quantum sffects. The results show that the suitable parameters of the nonequilibrium environment can retard the QFI and quantum coherence in both Markovian and non-Markovian regions. In addition, the smaller memory effects and the larger the jumping rate, the greater the QFI and quantum coherence. And a larger QFI naturally corresponds to a larger quantum coherence, which indicates that the quantum coherence can enlarge the QFI and can effectively enhance the quantum metrology.
Η διδασκαλία της γλώσσας σε παιδιά με ελαφρα νοητική καθυστέρηση: μια έρευνα δράσης
Creators: name: Γκαράνης, Ανδρέας Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Νοητική καθυστέρηση
Ερευνα δράσης
Αναγνωστική κατανόηση
Mental retardation
Action research
Reading comprehension

description: Κύριος σκοπός της παρούσας έρευνας είναι η εφαρμογή μιας διδασκαλίας σε ένα τμήμα με μαθητές με ελαφρά νοητική καθυστέρηση, προκειμένου οι τελευταίοι να αναπτύξουν επαρκώς τις δεξιότητες για την ανάγνωση και την κατανόηση της γλώσσας μέσω της εκμάθησης συγκεκριμένων στρατηγικών. Βασικός στόχος της έρευνας είναι να προσδιοριστούν και να αξιολογηθούν οι τροποποιήσεις που πρέπει να γίνουν κατά τη διδασκαλία της γλώσσας, ώστε να αποκτήσουν οι μαθητές με ελαφρά νοητική καθυστέρηση τις δεξιότητες ανάγνωσης και κατανόησης της γλώσσας. Παράλληλα, επιδιώχθηκε να πραγματοποιηθούν οι κατάλληλες μεθοδολογικές επιλογές ώστε να ενισχυθεί και η ενεργητική στάση των μαθητών και η ενεργητική συμμετοχή τους στη διαδικασία διδασκαλίας και μάθησης. Η μέθοδος που επιλέχθηκε ήταν η έρευνα δράσης. Τα αποτελέσματα της παρέμβασης κατέδειξαν ότι οι μαθητές με ελαφρά νοητική καθυστέρηση, που συμμετείχαν στην έρευνα, παρουσίασαν βελτίωση όσον αφορά την κατανόηση του γραπτού λόγου και μπόρεσαν να αξιοποιήσουν ικανοποιητικά τις στρατηγικές που διδάχτηκαν. Επιπλέον, η εφαρμογή της μεθόδου project συνέβαλε ώστε να αυξηθεί η συμμετοχή των μαθητών στη διδακτική διαδικασία και να ενισχυθεί η αλληλεπίδραση μεταξύ τους. Ωστόσο, στον τομέα της κριτικής και μεταγνωστικής ικανότητας καθώς και σε εκείνον που αναφέρεται στα γλωσσικά ελλείμματα των μαθητών δεν παρατηρήθηκε ουσιαστική αλλαγή.
description: The main purpose of the current study is an intensive instruction in a class of students with mild mental retardation, in order to provide to these students the acquisition of the basic skills for reading comprehension through specific reading strategies. This study attempted to address and evaluate the adaptation which had to facilitate In order to learn the students with mild mental retardation the skills for reading comprehension. In parallel, there where an attempt to define the methological choices so as to provide the active participation of the students due to teaching and learning process. An action research project was developed for this study. The results of the intervention suggest that the students with mild mental disability who participated improved their reading comprehension level and they learn to use the reading strategies that have been taught. Moreover, the implementation of “project” approach contributed to increasing participation of the students due to the learning process and had positive influence to their interaction. Nevertheless, as far as the critical and the meta-cognitive abilities are concerned and those which referred to the linguistic deficiency of the students none sufficient change occurred.
Practical Simplified Indoor Multiwall Path-Loss Model
Creators: name: Kang, Taewon
name: Seo, Jiwon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Over the past few decades, attempts had been made to build a suitable channel prediction model to optimize radio transmission systems. It is particularly essential to predict the path loss due to the blockage of the signal, in indoor radio system applications. This paper proposed a multiwall path-loss propagation model for an indoor environment, operating at a transmission frequency of 2.45 GHz in the industrial, scientific, and medical (ISM) radio band. The effects of the number of the walls to be traversed along the radio propagation path are considered in the model. To propose the model, the previous works on well-known indoor path loss models are discussed. Then, the path loss produced by the intervening walls in the propagation path is measured, and the terms representing the loss factors in the theoretical pathloss model are modified. The analyzed results of the path loss factors acquired at 2.45 GHz are presented. The proposed path-loss model simplifies the loss factor term with an admissible assumption of the indoor environment and predicts the path-loss factor accurately.
description: Submitted to ICCAS 2020
Semiclassical Approach to Chaotic Quantum Transport
Creators: name: Müller, Sebastian
name: Heusler, Stefan
name: Braun, Petr
name: Haake, Fritz
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We describe a semiclassical method to calculate universal transport properties of chaotic cavities. While the energy-averaged conductance turns out governed by pairs of entrance-to-exit trajectories, the conductance variance, shot noise and other related quantities require trajectory quadruplets; simple diagrammatic rules allow to find the contributions of these pairs and quadruplets. Both pure symmetry classes and the crossover due to an external magnetic field are considered.
description: 33 pages, 11 figures (appendices B-D not included in journal version)
Interior Point Methods Applied to the Linear Assignment Problem
Creators: name: Korimort, Thomas
Publisher: name: Zenodo
Year: 2000
Subjects: Interior Point Methods
Numerical Algorithms
Ellipsoid Method
Combinatorial Optimization
Linear Assignment Problem
C++
Computer Algorithms
Optimization Algorithms

description: An interior point algorithm is applied to the linear assignment problem. The algorithm is written in C++ and tested for its performance. Algorithmic correctness is derived.
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