cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On semistable principal bundles over a complex projective manifold
Creators: name: Biswas, Indranil
name: Bruzzo, Ugo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14F05, 14L10, 32L05

description: Let G be a simple linear algebraic group defined over the complex numbers. Fix a proper parabolic subgroup P of G and a nontrivial antidominant character χof P. We prove that a holomorphic principal G-bundle E over a connected complex projective manifold M is semistable and the second Chern class of its adjoint bundle vanishes in rational cohomology if and only if the line bundle over E/P defined by χis numerically effective. Similar results remain valid for principal bundles with a reductive linear algebraic group as the structure group. These generalize an earlier work of Y. Miyaoka where he gave a characterization of semistable vector bundles over a smooth projective curve. Using these characterizations one can also produce similar criteria for the semistability of parabolic principal bundles over a compact Riemann surface.
description: 21 pages. To appear in "International Mathematical Research Notices"
Circular chromatic index of graphs of maximum degree 3
Creators: name: Afshani, Peyman
name: Ghandehari, Mahsa
name: Ghandehari, Mahya
name: Hatami, Hamed
name: Tusserkani, Ruzbeh
name: Zhu, Xuding
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15

description: This paper proves that if $G$ is a graph (parallel edges allowed) of maximum degree 3, then $χ_c'(G) \leq 11/3$ provided that $G$ does not contain $H_1$ or $H_2$ as a subgraph, where $H_1$ and $H_2$ are obtained by subdividing one edge of $K_2^3$ (the graph with three parallel edges between two vertices) and $K_4$, respectively. As $χ_c'(H_1) = χ_c'(H_2) = 4$, our result implies that there is no graph $G$ with $11/3 < χ_c'(G) < 4$. It also implies that if $G$ is a 2-edge connected cubic graph, then $χ'(G) \le 11/3$.
"Stokes' Second Problem in High Frequency Limit. Application to Micro (Nano)- Resonators
Creators: name: Yakhot, V.
name: Colosqui, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Astrophysics (astro-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Using kinetic equation in the relaxation approximation (RTA), we investigate a flow generated by an infinite plate oscillating with frequency $ω$. Geometrical simplicity of the problem allows a solution in the entire range of dimensionless frequency variation $0\leq ωτ\leq \infty$, where $τ$ is a properly defined relaxation time. A transition from viscoelastic behavior of Newtonian fluid ($ωτ\to 0$) to purely elastic dynamics in the limit $ωτ\to \infty$ is discovered. The relation of the derived solutions to microfluidics (high-frequency micro-resonators) is demonstrated on an example of a "plane oscillator .
On the Complexity of the Circular Chromatic Number
Creators: name: Hatami, Hamed
name: Tusserkani, Ruzbeh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: Circular chromatic number, $χ_c$ is a natural generalization of chromatic number. It is known that it is \NP-hard to determine whether or not an arbitrary graph $G$ satisfies $χ(G) = χ_c(G)$. In this paper we prove that this problem is \NP-hard even if the chromatic number of the graph is known. This answers a question of Xuding Zhu. Also we prove that for all positive integers $k \ge 2$ and $n \ge 3$, for a given graph $G$ with $χ(G)=n$, it is \NP-complete to verify if $χ_c(G) \le n- \frac{1}{k}$.
Transition magnetic moments of Majorana neutrinos in supersymmetry without R-parity in light of neutrino oscillations
Creators: name: Gozdz, Marek
name: Kaminski, Wieslaw A.
name: Simkovic, Fedor
name: Faessler, Amand
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The transition magnetic moments of Majorana neutrinos are calculated in grand unified theory (GUT) constrained Minimal Supersymmetric Standard Model (MSSM) with explicit R-parity violation. It is assumed that neutrinos acquire masses via one-loop (quark-squark and lepton-slepton) radiative corrections. The mixing of squarks, sleptons, and quarks is considered explicitly. The connection between neutrino magnetic moments and the entries of neutrino mass matrix is studied. The current upper limits on neutrino magnetic moments are deduced from the elements of phenomenological neutrino mass matrix, which is reconstructed using the neutrino oscillation data and the lower bound on the neutrinoless double beta decay half-life. Further, the results for transitional magnetic moments of Majorana neutrinos are presented for the cases of inverted and normal hierarchy of neutrino masses and different SUSY scenarios. The largest values are of the order of 10^{-17} in units of Bohr magneton.
description: 12 pages including 1 eps figure
Effects of iron on the physiology of oceanic phytoplankton from the NE subarctic Pacific Ocean
Creators: name: Muggli, Deborah Lynn
Publisher: name: University of British Columbia
Year: 2009

description: The physiology of 2 oceanic phytoplankton species freshly isolated from the subarctic Pacific (Station P, 145°W, 50°N) was examined, focusing on the effects of iron (Fe) on various physiological parameters. The two species, a coccolithophore Emiliania huxleyi and a large diatom Actinocyclus sp., represent different taxonomic groups and size classes of indigenous phytoplankton found at Stn P. The effect that nitrogen source (NO3" vs. NH.4+) had on the physiology and metal nutrition of both E. huxleyi and Actinocyclus sp. under Fereplete and Fe-stressed conditions was examined. In general, the diatom responded as expected based on.theoretical energy and Fe requirement predictions, with NH4"*"-grown cells exhibiting a physiological advantage over NC>3"-grown cells under Fe-stressed conditions. In contrast, E. huxleyi exhibited no physiological advantage when grown on N H 4 + compared to NO3" under Fe-stressed conditions, largely due to the decrease in cell volume of NO3"-grown cells under Fe-stress. Secondly, the effect of Fe on the sinking rate of both the small oceanic coccolithophore and the larger diatom was examined. Fe conditions drastically affected the sinking rate of the diatom, with a > 5 times increase in sinking rate under Fe-replete compared to Fe-stressed conditions. Fe conditions had no effect on the oceanic coccolithophore. EDTA concentrations of 100 jtM were found to inhibit cell division rates by 30 - 50%, as well as affecting carbon metabolism in both species. As this concentration of EDTA is used in many phytoplankton/trace metal studies, caution is warranted, especially when working with oceanic species. Lastly, the ecophysiology of the 2 oceanic species in natural Stn P water (no metals or artificial chelators added) and in the same seawater to which 5 nM Fe was added was examined. Under in situ conditions, E. huxleyi grew maximally while Actinocyclus sp. was unable to divide. When 5 nM of Fe was added, Actinocyclus sp. resumed cell division and grew significantly faster than E. huxleyi. E. huxleyi's biochemical composition (chl a, C, N) did not change when Fe was added to the seawater, whereas the diatom exhibited signs of severe Fe-stress when grown on Stn P water with no additions. From the experiments conducted in this thesis, E. huxleyi appears to be better adapted to living in a low Fe environment than the diatom. These are the first laboratory data on phytoplankton species isolated from the NE subarctic Pacific (or any High Nutrient Low Chlorophyll region), and these data provide independent, physiological support for the Fe/grazing hypothesis in the NE subarctic Pacific.
Marcinkiewicz-Zygmund inequalities and interpolation by spherical harmonics
Creators: name: Marzo, Jordi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 94A20; 33C55; 65T40

description: We find necessary density conditions for Marcinkiewicz-Zygmund inequalities and interpolation for spaces of spherical harmonics with respect to the L^p norm. Moreover, we prove that there are no complete interpolation families for p\neq 2.
A significant excess in major merger rate for AGNs with the highest Eddington ratios at z<0.2
Creators: name: Marian, V.
name: Jahnke, K.
name: Andika, I.
name: Banados, E.
name: Bennert, V. N.
name: Cohen, S.
name: Husemann, B.
name: Kaasinen, M.
name: Koekemoer, A. M.
name: Mechtley, M.
name: Onoue, M.
name: Schindler, J. T.
name: Schramm, M.
name: Schulze, A.
name: Silverman, J. D.
name: Smirnova-Pinchukova, I.
name: van der Wel, A.
name: Villforth, C.
name: Windhorst, R. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observational studies are increasingly finding evidence against major mergers being the dominant mechanism responsible for triggering AGN. After studying the connection between major mergers and AGN with the highest Eddington ratios at z=2, we here expand our analysis to z<0.2, exploring the same AGN parameter space. Using ESO VLT/FORS2 B-, V- and color images, we examine the morphologies of 17 galaxies hosting AGNs with Eddington ratios >0.3, and 25 mass- and redshift-matched control galaxies. To match the appearance of the two samples, we add synthetic point sources to the inactive comparison galaxies. The combined sample of AGN and inactive galaxies was independently ranked by 19 experts with respect to the degree of morphological distortion. We combine the resulting individual rankings into multiple overall rankings, from which we derive the respective major merger fractions of the two samples. With a best estimate of 0.41 $\pm$ 0.12 for the AGN host galaxies and 0.08 $\pm$ 0.06 for the inactive galaxies our results imply that our AGN host galaxies have a significantly higher merger rate, regardless of the observed wavelength or applied methodology. We conclude that although major mergers are an essential mechanism to trigger local high Eddington ratio AGNs at z<0.2, the origin of >=50% of this specific AGN subpopulation still remains unclear.
description: 17 pages (plus 23 pages appendix), 8 figures, 3 tables; Accepted for publication in ApJ
State-resolved rotational cross sections and thermal rate coefficients for ortho-/para-H2+HD at low temperatures and HD+HD elastic scattering
Creators: name: Sultanov, Renat A.
name: Khugaev, Avas V.
name: Guster, Dennis
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Results for quantum mechanical calculations of the integral cross sections and corresponding thermal rate coefficients for para-/ortho-H2+HD collisions are presented. Because of significant astrophysical interest in regard to the cooling of primodial gas the low temperature limit of para-/ortho-H2+HD is investigated. Sharp resonances in the rotational state-resolved cross sections have been calculated at low energies. These resonances are important and significantly contribute to the corresponding rotational state-resolved thermal rate coefficients, particularly at low temperatures, that is less than $T \sim 100$K. Additionally in this work, the cross sections for the elastic HD+HD collision have also been calculated. We obtained quite satisfactory agreement with the results of other theoretical works and experiments.
description: 16 pages, 5 figures, additional results included
Dynamic role of dust in formation of molecular clouds
Creators: name: Zhuravlev, V. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Dust is the usual minor component of the interstellar medium. Its dynamic role in the contraction of the diffuse gas into molecular clouds is commonly assumed to be negligible because of the small mass fraction, $f \simeq 0.01$. However, as shown in this study, the collective motion of dust grains with respect to the gas may considerably contribute to the destabilisation of the medium on scales $λ\lesssim λ_J$, where $λ_J$ is the Jeans length-scale. The linear perturbations of the uniform self-gravitating gas at rest are marginally stable at $λ\simeq λ_J$, but as soon as the drift of grains is taken into account, they begin growing at a rate approximately equal to $(f τ)^{1/3} t^{-1}_{ff}$, where $τ$ is the stopping time of grains expressed in units of the free fall time of the cloud, $t_{ff}$. The physical mechanism responsible for such a weak dependence of the growth rate on $f$ is the resonance of heavy sound waves stopped by the self-gravity of gas with weak gravitational attraction caused by perturbations of the dust fraction. Once there is stationary subsonic bulk drift of the dust, the growing gas-dust perturbations at $λ< λ_J$ become waves propagating with the drift velocity projected onto the wavevector. Their growth has a resonant nature as well and the growth rate is substantially larger than that of the recently discovered resonant instability of gas-dust mixture in the absence of self-gravity. The new instabilities can facilitate gravitational contraction of cold interstellar gas into clouds and additionally produce dusty domains of sub-Jeans size at different stages of molecular cloud formation and evolution.
description: 19 pages, 7 figures; accepted for publication in MNRAS
KOSAKATA DALAM BAHASA DAERAH JAWA TIMUR
Creators: name: Sabrina, Balqis
Publisher: name: Zenodo
Year: 2024
Subjects: "kamus", "bahasa jawa", "leksikografi", "kosakata", "kata dasar"

description: Kamus ini berisi tentang kata dasar dalam bahasa Jawa Timur, yang merupakan salah satu dialek utama bahasa Jawa yang digunakan di wilayah Jawa Timur, Indonesia. Bahasa Jawa Timur, atau sering disebut sebagai "Boso Suroboyoan", memiliki ciri unik yang membedakannya dari dialek Jawa lainnya, terutama dalam hal pemahaman dasar dan pengucapan. Kamus ini bertujuan untuk mengidentifikasi dan menganalisis kata-kata dasar yang menjadi landasan dalam komunikasi sehari-hari masyarakat Jawa Timur. Proses pembuatan kamus ini melibatkan beberapa tahap, seperti: 1) Pengumpulan data, dengan melakukan wawancara dengan penduduk asli dan aktif berbicara dalam bahasa Jawa Timur yang direkam untuk mengetahui penggunaan kosakata tersebut masih digunakan atau tidak, serta mengumpulkan kata-kata dari sumber tertulis seperti sastra lokal dan media masa. 2) Pemilihan Lema, dari ribuan kata yang dikumpulkan hanya dipilih kata-kata yang paling sering digunakan. Kamus ini akan mencakup sekitar 100 lema. 3) Penyusunan definisi, setiap kata dijelaskan dalam bahasa Indonesia dengan definisi yang jelas dan mudah dipahami. 4) Pengkategorian, kata-kata diklasifikasikan berdasarkan kelas kata (kata benda, kata kerja, kata sifat, dll.) Kamus “Kosakata dalam Bahasa Jawa Timur” diharapkan menjadi sumber referensi yang komprehensif, tidak hanya bagi penutur asli bahasa Jawa Timur, tetapi juga bagi mereka yang ingin mempelajari kekayaan bahasa Jawa Timur itu sendiri.
Observational constraints on cosmological solutions of $f(Q)$ theories
Creators: name: Ayuso, Ismael
name: Lazkoz, Ruth
name: Salzano, Vincenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Over the last years some interest has been gathered by $f(Q)$ theories, which are new candidates to replace Einstein's prescription for gravity. The non-metricity tensor $Q$ allows to put forward the assumption of a free torsionless connection and, consequently, new degrees of freedom in the action are taken into account. This work focuses on a class of $f(Q)$ theories, characterized by the presence of a general power-law term which adds up to the standard (linear in) $Q$ term in the action, and on new cosmological scenarios arising from them. Using the Markov chain Montecarlo method we carry out statistical tests relying upon background data such as Type Ia Supernovae luminosities and direct Hubble data (from cosmic clocks), along with Cosmic Microwave Background shift and Baryon Acoustic Oscillations data. This allows us to perform a multifaceted comparison between these new cosmologies and the (concordance) $Λ$CDM setup. We conclude that, at the current precision level, the best fits of our $f(Q)$ models correspond to values of their specific parameters which make them hardly distinguishable from our General Relativity "échantillon", that is $Λ$CDM.
description: 15 pages, 13 figures
Affine Transformations of Loop Nests for Parallel Execution and Distribution of Data over Processors
Creators: name: Adutskevich, E. V.
name: Bakhanovich, S. V.
name: Likhoded, N. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The paper is devoted to the problem of mapping affine loop nests onto distributed memory parallel computers. A method to find affine transformations of loop nests for parallel execution and distribution of data over processors is presented. The method tends to minimize the number of communications between processors and to improve locality of data within one processor. A problem of determination of data exchange sequence is investigated. Conditions to determine the ability to arrange broadcast is presented.
description: 9 pages
Physics of Symmetry Protected Topological phases involving Higher Symmetries and their Applications
Creators: name: Jian, Chao-Ming
name: Wu, Xiao-Chuan
name: Xu, Yichen
name: Xu, Cenke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss physical constructions, and the boundary properties of various symmetry protected topological phases that involve 1-form symmetries, from one spatial dimension (1d) to four spatial dimensions (4d). For example, the prototype 3d boundary state of 4d SPT states involving 1-form symmetries can be either a gapless photon phase (quantum electrodynamics) or gapped topological order enriched by 1-form symmetries, namely the loop excitations of these topological orders carry nontrivial 1-form symmetry charges. This study also serves the purpose of diagnosing anomaly of 3d states of matter. Connection between SPT states with 1-form symmetries and condensed matter systems such as quantum dimer models at one lower dimension will also be discussed. Whether a quantum dimer model can have a trivial gapped phase or not depends on the nature of its corresponding bulk state in one higher dimension.
description: 10 pages, 1 figure
Η Νέα Γυναίκα στον εργασιακό κόσμο της εποχής της Βαϊμάρης αλλά και οι διαφυλετικές της σχέσεις όπως διαφαίνεται μέσα από τα λογοτεχνικά βιβλία «Gilgi – eine von uns» της Irmgard Keun και «Eine Zierde:
Creators: name: Γαλάταλη, Φωτεινή Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Γεωργοπούλου, Ελένη καθηγήτρια

description: Η Δημοκρατία της Βαϊμάρης είναι μια εξαιρετικά πολύπλοκη ιστορική περίοδο (1918 – 1933), με αλλαγές τόσο στον πολιτικό, όσο και στον οικονομικό, κοινωνικό, τεχνολογικό και λογοτεχνικό χώρο. Παρόλο τις αλλαγές όμως φαίνεται μέχρι και σήμερα πως αυτές δεν ολοκληρώθηκαν ακόμα ουσιαστικά, όπως για παράδειγμα όσον αφορά την κατάσταση των γυναικών στην κοινωνία, στον κόσμο της εργασίας, ή ακόμη και στις διαπροσωπικές τους σχέσεις. Αυτά ακριβώς είναι και τα σημεία που ασχολείται αυτή η διπλωματική εργασία μέσα από τις δυο ηρωίδες Gilgi και Frieda, των βιβλίων «Gilgi – eine von uns» και «Eine Zierde für den Verein. Ein Roman vom Rauchen, Sporteln, Lieben und Verkaufen» των συγγραφέων Irmgard Keun και Marieluise Fleißer αντίστοιχα. Και οι δύο πρωταγωνίστριες συγκρίνονται και αναλύονται, καθεμία σε σχέση με ποιον τύπο της Νέας Γυναίκας της Δημοκρατίας της Βαϊμάρης αντιπροσωπεύει. Η πρώτη ηρωίδα, η οποία πλάθει ακόμα τον χαρακτήρα της, είναι μια χειραφετημένη γυναίκα, που θέλει και επιδιώκει να είναι κυρίως οικονομικά ανεξάρτητη από τον άνδρα, ενώ η δεύτερη, ως πιο έμπειρη γυναίκα, έχει αρκετά χαρακτηριστικά ενός άνδρα ώστε να μπορεί να επιζήσει στον ανδροκρατούμενο επαγγελματικά χώρο. Συνοψίζοντας στο τέλος τις θέσεις και τις απόψεις των δύο γυναικών προκύπτει το συμπέρασμα πως η δεύτερη ηρωίδα καθρεφτίζει την ζωή της πρώτης.
description: The Weimar Republic is an extremely complex historical period (1918 - 1933). During that period changes took place in the political as well as the economic, social, technological and literary field. Despite the changes, it seems even today that they were not substantially completed. For example, there were no substantial changes in women’s social status as well as their place in the labor sector. These are exactly the points dealt within this thesis. In the books of Irmgard Keun and Marieluise Fleißer, «Gilgi - eine von uns» and «Eine Zierde für den Verein. Ein Roman vom Rauchen, Sporteln, Lieben und Verkaufen » respectively, two heroines Gilgi and Frieda, are being compared and analyzed towards their relationship to the type of New Woman in the Weimar Republic. The first heroine, who still shapes her character, is an emancipated woman who wants and seeks to be financially independent. The second one, a more experienced woman, has several masculine features and can survive in a male-dominated workplace. Summarizing the views and opinions of the two women, it is concluded that the second heroine reflects the life of the first one.
Gauge Principle and Gauge Invariance in Two-Level Systems
Creators: name: Savasta, Salvatore
name: Di Stefano, Omar
name: Settineri, Alessio
name: Zueco, David
name: Hughes, Stephen
name: Nori, Franco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum Rabi model is a widespread description of the coupling between a two-level system and a quantized single mode of an electromagnetic resonator. Issues about this model's gauge invariance have been raised. These issues become evident when the light-matter interaction reaches the so-called ultrastrong coupling regime. Recently, a modified quantum Rabi model able to provide gauge-invariant physical results (e.g., energy levels, expectation values of observables, quantum probabilities) in any interaction regime was introduced [Nature Physics 15, 803 (2019)]. Here we provide an alternative derivation of this result, based on the implementation in two-state systems of the gauge principle, which is the principle from which all the fundamental interactions in quantum field theory are derived. The adopted procedure can be regarded as the two-site version of the general method used to implement the gauge principle in lattice gauge theories. Applying this method, we also obtain the gauge-invariant quantum Rabi model for asymmetric two-state systems, and the multi-mode gauge-invariant quantum Rabi model beyond the dipole approximation.
description: arXiv admin note: substantial text overlap with arXiv:2006.06583
Ergodic Properties of a Class of Discrete Abelian Group Extensions of Rank-One Transformations
Creators: name: Dodd, Chris
name: Jeasakul, Phakawa
name: Jirapattanakul, Anne
name: Kane, Daniel M.
name: Robinson, Becky
name: Stein, Noah
name: Silva, Cesar E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A40, 37A15

description: We define a class of discrete abelian group extensions of rank-one transformations and establish necessary and sufficient conditions for these extensions to be power weakly mixing. We show that all members of this class are multiply recurrent. We then study conditions sufficient for showing that cartesian products of transformations are conservative for a class of invertible infinite measure-preserving transformations and provide examples of these transformations.
description: 20 pages
Discovery of a large population of Nitrogen-Enhanced stars in the Magellanic Clouds
Creators: name: Fernández-Trincado, José G.
name: Beers, Timothy C.
name: Minniti, Dante
name: Carigi, Leticia
name: Barbuy, Beatriz
name: Placco, Vinicius M.
name: Bidin, Christian Moni
name: Villanova, Sandro
name: Roman-Lopes, Alexandre
name: Nitschelm, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the APOGEE-2S$+$ discovery of a unique collection of nitrogen-enhanced mildly metal-poor giant stars, peaking at [Fe/H]$\sim -0.89$ with no carbon enrichment, toward the Small and Large Magellanic Clouds (MCs), with abundances of light- (C, N), odd-Z (Al, K) and $α-$elements (O, Mg, Si) that are typically found in Galactic globular clusters (GCs). Here we present 44 stars in the MCs that exhibit significantly enhanced [N/Fe] abundance ratios, well above ([N/Fe]$>+0.6$) typical Galactic levels at similar metallicity, and a star that is very nitrogen-enhanced ([N/Fe]$> +2.45$). Our sample consists of luminous evolved stars on the asymptotic giant branch (AGB), eight of which are classified as bonafide semi-regular (SR) variables, as well as low-luminosity stars similar to that of stars on the tip of the red giant branch of stellar clusters in the MCs. It seems likely that whatever nucleosynthetic process is responsible for these anomalous MC stars it is similar to that which caused the common stellar populations in GCs. We interpret these distinctive C-N patterns as the observational evidence of the result of tidally shredded GCs in the MCs. These findings might explain some previous conflicting results over bulge N-rich stars, and broadly help to understand GC formation and evolution. Furthermore, the discovery of such a large population of N-rich AGB stars in the MCs suggests that multiple stellar populations might not only be exotic events from the past but can also form at lower redshift.
description: Accepted for publication in ApJ Letters; 11 pages, 4 Figures, 1 Table
On the Computational Complexity of Defining Sets
Creators: name: Hatami, Hamed
name: Maserrat, Hossein
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: Suppose we have a family ${\cal F}$ of sets. For every $S \in {\cal F}$, a set $D \subseteq S$ is a {\sf defining set} for $({\cal F},S)$ if $S$ is the only element of $\cal{F}$ that contains $D$ as a subset. This concept has been studied in numerous cases, such as vertex colorings, perfect matchings, dominating sets, block designs, geodetics, orientations, and Latin squares. In this paper, first, we propose the concept of a defining set of a logical formula, and we prove that the computational complexity of such a problem is $Σ_2$-complete. We also show that the computational complexity of the following problem about the defining set of vertex colorings of graphs is $Σ_2$-complete: {\sc Instance:} A graph $G$ with a vertex coloring $c$ and an integer $k$. {\sc Question:} If ${\cal C}(G)$ be the set of all $χ(G)$-colorings of $G$, then does $({\cal C}(G),c)$ have a defining set of size at most $k$? Moreover, we study the computational complexity of some other variants of this problem.
Improved Fokker-Planck Equation for Resonance Line Scattering
Creators: name: Rybicki, George B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new Fokker-Planck equation is developed for treating resonance line scattering, especially relevant to the treatment of Lyman alpha in the early universe. It is a "corrected" form of the equation of Rybicki & Dell'Antonio that now obeys detailed balance, so that the approach to thermal equilibrium is properly described. The new equation takes into account the energy changes due to scattering off moving particles, the recoil term of Basko, and stimulated scattering. One result is a surprising unification of the equation for resonance line scattering and the Kompaneets equation. An improved energy exchange formula due to resonance line scattering is derived. This formula is compared to previous formulas of Madau, Meikson, & Rees (1997) and Chen & Miralda-Escudé (2004).
description: 10 pages, no figures, submitted to ApJ
Degeneracy between mass and peculiar acceleration for the double white dwarfs in the LISA band
Creators: name: Xuan, Zeyuan
name: Peng, Peng
name: Chen, Xian
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Mass and distance are fundamental quantities to measure in gravitational-wave (GW) astronomy. However, recent studies suggest that the measurement may be biased due to the acceleration of GW source. Here we develop an analytical method to quantify such a bias induced by a tertiary on a double white dwarf (DWD), since DWDs are the most common GW sources in the milli-Hertz band. We show that in a large parameter space the mass is degenerate with the peculiar acceleration, so that from the waveform we can only retrieve a mass of ${\cal M}(1+Γ)^{3/5}$, where ${\cal M}$ is the real chirp mass of the DWD and $Γ$ is a dimensionless factor proportional to the peculiar acceleration. Based on our analytical method, we conduct mock observation of DWDs by the Laser Interferometer Space Antenna (LISA). We find that in about $9\%$ of the cases the measured chirp mass is biased due to the presence of a tertiary by $(5-30)\%$. Even more extreme cases are found in about a dozen DWDs and they may be misclassified as double neutron stars, binary black holes, DWDs undergoing mass transfer, or even binaries containing lower-mass-gap objects and primordial black holes. The bias in mass also affects the measurement of distance, resulting in a seemingly over-density of DWDs within a heliocentric distance of $1$ kpc as well as beyond $100$ kpc. Our result highlights the necessity of modeling the astrophysical environments of GW sources to retrieve their correct physical parameters.
Scalable superconducting qubit circuits using dressed states
Creators: name: Liu, Yu-xi
name: Sun, C. P.
name: Nori, Franco
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study a coupling/decoupling method between a superconducting qubit and a data bus that uses a controllable time-dependent electromagnetic field (TDEF). As in recent experiments, the data bus can be either an LC circuit or a cavity field. When the qubit and the data bus are initially fabricated, their detuning should be made far larger than their coupling constant, so these can be treated as two independent subsystems. However, if a TDEF is applied to the qubit, then a "dressed qubit" (i.e., qubit plus the electromagnetic field) can be formed. By choosing appropriate parameters for the TDEF, the dressed qubit can be coupled to the data bus and, thus, the qubit and the data bus can exchange information with the assistance of the TDEF. This mechanism allows the scalability of the circuit to many qubits. With the help of the TDEF, any two qubits can be selectively coupled to (and decoupled from) a common data bus. Therefore, quantum information can be transferred from one qubit to another.
description: 10 pages, 5 figures
Καταγραφή των απόψεων των διευθυντών και των σχολικών συμβούλων της Α/θμιας εκπαίδευσης σε θέματα διγλωσσίας και δίγλωσσης εκπαίδευσης
Creators: name: Ιορδανίδου, Αναστασία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Διγλωσσία
Δίγλωσση εκπαίδευση
Στελέχη εκπαίδευσης
Bilingualism
Bilingual education
School leadership

description: Στόχος της παρούσας διατριβής ήταν η καταγραφή των απόψεων 224 διευθυντών από διάφορες σχολικές μονάδες της ελληνικής επικράτειας και 10 σχολικών συμβούλων της περιφέρειας της Δυτικής Μακεδονίας της Πρωτοβάθμιας Εκπαίδευσης σε θέματα διγλωσσίας και δίγλωσσης εκπαίδευσης, μέσα από ερωτηματολόγια και ημιδομημένες συνεντεύξεις. Επίσης, μέσα από την ανάλυση λόγου επιχειρείται μία βαθύτερη ανάλυση των πεποιθήσεων των συγκεκριμένων στελεχών εκπαίδευσης. Τα δεδομένα που συλλέχθηκαν ερμηνεύονται με βάση τις θεωρίες για τη διγλωσσία και τις απόψεις διευθυντών και των σχολικών συμβούλων για τη δίγλωσση εκπαίδευση στην Ελλάδα. Τα αποτελέσματα καταδεικνύουν τη θετική στάση και των διευθυντών και των σχολικών συμβούλων προς τη διγλωσσία, καθώς φαίνεται να αναγνωρίζουν ποικίλα γνωστικά πλεονεκτήματα. Διαφωνούν μεταξύ τους ως προς την ύπαρξη ρατσιστικών τάσεων προς τους αλλοδαπούς μαθητές, αφού οι μεν διευθυντές δεν έχουν παρατηρήσει φαινόμενα ρατσισμού στο σχολείο τους, οι δε σχολικοί σύμβουλοι πιστεύουν στην ύπαρξη τέτοιων φαινομένων. Ως προς την εφαρμογή της δίγλωσσης εκπαίδευσης στην Ελλάδα και τα δύο δείγματα θεωρούν το θεσμικό πλαίσιο ελλιπές και ανεφάρμοστο, τους εκπαιδευτικούς χωρίς την κατάλληλη κατάρτιση και το εκπαιδευτικό σύστημα ανέτοιμο να διαχειριστεί προβλήματα που αφορούν τη διαπολιτισμικότητα.
description: The aim of the present research is the recording of the views of 224 school principals from different school units all around Greece and 10 school directors of Primary School Education in the West Macedonia region on matters of bilingualism and bilingual education, through questionnaires and semi-structured interviews. Furthermore, through the analysis, of speech, a deeper analysis of the specific executives beliefs is attempted. The data collected is interpreted based on the theories on bilingualism and the principals and school directors views on bilingual education in Greece. The results demonstrate the positive attitude of the principals and the schools directors towards bilingualism, as they seem to identify various learning advantages. They disagree with each other as far as the occurrence of racist trends towards foreign students is concerned, since the principals have not noticed phenomena of racism in their schools, while the schools counselors believe that such phenomena occur. On the matter of the implementation of bilingual education in Greece both groups think that the institutional framework is inadequate and inapplicable, the teachers are not properly trained and the educational system is not ready to handle problems that have to do with interculturalism.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Νηπιαγωγών (Πανεπιστήμιο Δυτικής Μακεδονίας)
Changing images of self : the efficacy of retirement preparation programmes for women
Creators: name: Comish, Sara Elizabeth
Publisher: name: University of British Columbia
Year: 2009

description: Facing retirement can be a stressful experience for sonne older adults. A cognitive-behavioural intervention was designed to help older wonnen cope with retirement anxiety, specifically targeting positive images of self in the future, described by Markus and Nurius (1986) as possible selves. Sixty-one preretirement women ranging in age from 49 to 71 (/W = 59.9) were randomly assigned to either a targeted-change group, a structured-discussion group, or a wait-list control group. The targeted-change group and the structured-discussion group met for 2 hours a week for 8 weeks. A modified state form of the State- Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, Vagg, & Jacobs, 1983), the Short form of the Multiscore Depression Inventory (Berndt, 1986), the Retirement Self-efficacy questionnaire (Poser & Engels, 1983), and a measure of possible selves were administered pre- and post-treatment, with a 3-month follow-up. Following the post-test, participants in the wait-list were assigned to one of the retirement seminars. It was predicted that from pre- to post-test participants in the targeted-change group would show a greater change in the measures than participants in the structured-discussion groups who would in turn, show a greater change than participants in the wait-list. The predictions were tested using planned orthogonal univariate tests. Retirement self-efficacy and positive possible selves increased more for participants in the targeted-change group and structured-discussion groups than for participants in the wait-list from pre-test to post-test. In addition, positive possible selves increased more for participants in the targeted-change than for participants in the structureddiscussion group from pre-test to the average of post-test and follow-up. It was concluded that the interventions were effective in changing how participants saw themselves in the future. Conclusions with regard to treatment efficacy, however, were restricted by observed change in the wait-list group on the anxiety measure following the initial interview, The results are discussed in terms of non-specific treatment effects, along with issues relating to research on possible selves, and implications for retirement programmes.
Return of the Big Glitcher: NICER timing and glitches of PSR J0537-6910
Creators: name: Ho, Wynn C. G.
name: Espinoza, Cristobal M.
name: Arzoumanian, Zaven
name: Enoto, Teruaki
name: Tamba, Tsubasa
name: Antonopoulou, Danai
name: Bejger, Michal
name: Guillot, Sebastien
name: Haskell, Brynmor
name: Ray, Paul S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: PSR J0537-6910, also known as the Big Glitcher, is the most prolific glitching pulsar known, and its spin-induced pulsations are only detectable in X-ray. We present results from analysis of 2.7 years of NICER timing observations, from 2017 August to 2020 April. We obtain a rotation phase-connected timing model for the entire timespan, which overlaps with the third observing run of LIGO/Virgo, thus enabling the most sensitive gravitational wave searches of this potentially strong gravitational wave-emitting pulsar. We find that the short-term braking index between glitches decreases towards a value of 7 or lower at longer times since the preceding glitch. By combining NICER and RXTE data, we measure a long-term braking index n=-1.25+/-0.01. Our analysis reveals 8 new glitches, the first detected since 2011, near the end of RXTE, with a total NICER and RXTE glitch activity of 8.88x10^-7 yr^-1. The new glitches follow the seemingly unique time-to-next-glitch---glitch-size correlation established previously using RXTE data, with a slope of 5 d microHz^-1. For one glitch around which NICER observes two days on either side, we search for but do not see clear evidence of spectral nor pulse profile changes that may be associated with the glitch.
description: 11 pages, 10 figures; accepted for publication in MNRAS
Perfect dominating sets in the Cartesian products of prime cycles
Creators: name: Hatami, Hamed
name: Hatami, Pooya
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C69

description: We study the structure of a minimum dominating set of $C_{2n+1}^n$, the Cartesian product of $n$ copies of the cycle of size $2n+1$, where $2n+1$ is a prime.
description: Final version
Computational modeling of electrophysiology and molecular variability in single neurons reveals a tunable switch with discrete neuromodulatory response phenotypes
Creators: name: Anderson, Warren
name: Hirenkumar Markadia
name: Rajanikanth Vadigepalli
Publisher: name: F1000Research
Year: 2015

description: Recent single cell studies show extensive molecular variability underlying cellular responses. We evaluated the impact of such variability in the expression of molecular components on the neurophysiology and neuromodulation. We employed a computational model that integrates neuropeptide receptor-mediated signaling and electrophysiology. We simulated a large population of neurons in which expression levels of a neuropeptide receptor and multiple ion channels were simultaneously varied over a range of physiological levels. We analyzed the effects of variation on the electrophysiological response to a neuropeptide stimulus. Our results revealed distinct response patterns associated with low versus high receptor levels and were further tuned by the biophysical state. Neurons with low receptor levels showed increased excitability and neurons with high receptor levels showed reduced excitability. These response patterns were separated by a narrow range of receptor levels forming a separatrix. The position of this separatrix was dependent on the expression level of multiple ion channels. To assess the relative contributions of receptor and ion channel levels to the response profiles, we categorized the responses into five phenotypes based on response kinetics and magnitude. The results showed that ion channel expression variation primarily influenced response kinetics while receptor level variation primarily influenced the steady-state response. Our results show that receptor expression and biophysical state interact to yield discrete neuronal activity phenotypes corresponding to a tunable switch-like behavior.

Funding: NIH/NHLBI R01 111621.
How to preserve symmetries with cut-off regularized integrals?
Creators: name: Varin, T.
name: Davesne, D.
name: Oertel, M.
name: Urban, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a prescription to calculate the quadratic and logarithmic divergent parts of several integrals employing a cutoff in a coherent way, i.e. in total agreement with symmetry requirements. As examples we consider one-loop Ward identities for QED and a phenomenological chiral model.
description: 11 pages, 3 graphs
Approximation and Inapproximability Results for Maximum Clique of Disc Graphs in High Dimensions
Creators: name: Afshani, Peyman
name: Hatami, Hamed
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Geometry (cs.CG)
subject: Metric Geometry (math.MG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We prove algorithmic and hardness results for the problem of finding the largest set of a fixed diameter in the Euclidean space. In particular, we prove that if $A^*$ is the largest subset of diameter $r$ of $n$ points in the Euclidean space, then for every $ε>0$ there exists a polynomial time algorithm that outputs a set $B$ of size at least $|A^*|$ and of diameter at most $r(\sqrt{2}+ε)$. On the hardness side, roughly speaking, we show that unless $P=NP$ for every $ε>0$ it is not possible to guarantee the diameter $r(\sqrt{4/3}-ε)$ for $B$ even if the algorithm is allowed to output a set of size $({95\over 94}-ε)^{-1}|A^*|$.
description: Final version
Σύγχρονες αναγνώσεις του Νίτσε για την τέχνη: οι περιπτώσεις Νεχαμά και Χάιντεγκερ:
Creators: name: Καπετάνιου, Ελισσάβετ Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Νίτσε
Χάιντεγκερ
Νεχαμάς
ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ Nietzsche
Heidegger
Nehamas

description: Σκοπός της παρούσας εργασίας είναι η μελέτη των απόψεων του Νίτσε αναφορικά με την τέχνη. Ειδικότερα, εξετάζουμε τις περιπτώσεις του Νεχαμά και του Χάιντεγκερ. Στο πρώτο μέρος, παρουσιάζουμε την αισθητική προσέγγιση του Νεχαμά, σύμφωνα με την οποία ο Νίτσε είναι ένας αισθητικός φιλόσοφος που έχει ως στόχο να δημιουργήσει τον εαυτό του μέσα από τα έργα του. Αντιμετωπίζει τη ζωή του ως ένα λογοτεχνικό κείμενο. Στη συνέχεια αναφερόμαστε στις βασικές έννοιες της νιτσεϊκής φιλοσοφίας, όπως στον προοπτικισμό, στη γενεαλογική μέθοδο, στην έννοια της αλήθειας, στη θέληση για δύναμη για να υπογραμμίσουμε τις αναλογίες που συναντούμε διαρκώς ανάμεσα στη ζωή και την τέχνη στο σύμπαν του Νίτσε. Στο δεύτερο μέρος ασχολούμαστε με την ανάγνωση της χαϊντεγκεριανής προσέγγισης, η οποία ερμηνεύει την τέχνη του Νίτσε ως θέληση για δύναμη. Αναφερόμαστε στη σχέση τέχνης και αλήθειας που κατέχει κεντρική θέση στη σκέψη του Χάιντεγκερ και εξηγούμε την έννοια του μηδενισμού που αποτελεί έννοια- κλειδί για την κατανόηση του φιλοσοφικού έργου του Νίτσε. Για τον Νίτσε, η τέχνη βρίσκεται στον αντίποδα του μηδενισμού και η τέχνη είναι ένας τρόπος έκφρασης της βούλησης για ισχύ.
description: The aim of the present thesis is to discuss Nietzsche’s views on art. In particular we examined Nehamas’ and Heidegger’s interpretations of the Nietzschean theories. We presented the aesthetic approach of Nehamas according to whom Nietzsche is an aesthetic philosopher who, on the one hand, looks at the world as if it were a literary text, and, on the other, aims to create a literary character. Furthermore, we analyzed Nietzsche's key ideas such as perspectivism, the will to power and his view on truth in order to point out the similarities between life and art in Nietzsche’s writings. Finally, we examined Heidegger’s interpretation which discerns art as the will to power and therein analyzed the relation between truth and in his philosophy.
Three-dimensional super-Yang--Mills theory on the lattice and dual black branes
Creators: name: Catterall, Simon
name: Giedt, Joel
name: Jha, Raghav G.
name: Schaich, David
name: Wiseman, Toby
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In the large-$N$ and strong-coupling limit, maximally supersymmetric SU($N$) Yang--Mills theory in $(2 + 1)$ dimensions is conjectured to be dual to the decoupling limit of a stack of $N$ D$2$-branes, which may be described by IIA supergravity.We study this conjecture in the Euclidean setting using nonperturbative lattice gauge theory calculations.Our supersymmetric lattice construction naturally puts the theory on a skewed Euclidean 3-torus. Taking one cycle to have anti-periodic fermion boundary conditions, the large-torus limit is described by certain Euclidean black holes. We compute the bosonic action---the variation of the partition function---and compare our numerical results to the supergravity prediction as the size of the torus is changed, keeping its shape fixed. Our lattice calculations primarily utilize $N = 8$ with extrapolations to the continuum limit, and our results are consistent with the expected gravity behavior in the appropriate large-torus limit.
description: v1: 11 pages with 5 figures and data release at https://zenodo.org/record/4059477
Testing for a linear MA model against threshold MA models
Creators: name: Ling, Shiqing
name: Tong, Howell
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62F05, 62M10 (Primary) 60G10 (Secondary)

description: This paper investigates the (conditional) quasi-likelihood ratio test for the threshold in MA models. Under the hypothesis of no threshold, it is shown that the test statistic converges weakly to a function of the centred Gaussian process. Under local alternatives, it is shown that this test has nontrivial asymptotic power. The results are based on a new weak convergence of a linear marked empirical process, which is independently of interest. This paper also gives an invertible expansion of the threshold MA models.
description: Published at http://dx.doi.org/10.1214/009053605000000598 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)