cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Where are the hot ion lines in classical T Tauri stars formed?
Creators: name: Günther, H. M.
name: Schmitt, J. H. M. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Classical T Tauri stars show a plethora of in- and outflow signatures in a variety of wavelengths bands. In order to constrain gas velocities and temperatures we analyse the emission in the hot ion lines. We use all available archival FUSE spectra of CTTS to measure the line widths, fluxes and shifts and complement this sample with HST/GHRS and HST/STIS data. We present theoretical estimates for temperatures reached in possible emission models like jets, winds, disks and accretion funnels and look for correlations with X-ray lines and absorption properties. We find line shifts in the range from -170 km/s and +100 km/s. Most linewidths exceed the stellar rotational broadening. Those CTTS with blue-shifted lines also show excess absorption in X-rays. CTTS single out from MS stars by their large ratio of the O VII to O VI luminosities. No single emission mechanism can be found for all objects. The properties of those stars with blue-shifted lines are compatible with an origin in a shock-heated dust-depleted outflow.
description: accepted by A&A Replacement done after language editing
Particle size effect on the Langmuir-Hinshelwood barrier for CO oxidation on regular arrays of Pd clusters supported on ultrathin alumina films
Creators: name: Sitja, Georges
name: Tissot, Héloïse
name: Henry, Claude
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The Langmuir-Hinshelwood barrier (ELH) and the pre-exponential factor ($ν$LH) for CO oxidation have been measured at high temperature on hexagonal arrays of Pd clusters supported on an ultrathin alumina film on Ni3Al(111). The Pd clusters have a sharp size distribution and the mean sizes are: 174$\pm$13, 360$\pm$19 and 768$\pm$28 atoms. ELH and $ν$LH are determined from the initial reaction rate of a CO molecular beam with a saturation layer of adsorbed oxygen on the Pd clusters, measured at different temperatures (493$\le$T (K) $\le$613). The largest particles (3.5 nm) give values of ELH and $ν$LH similar to those measured on Pd (111) [2]. However, smaller particles (2.7 and 2.1 nm) show very different behavior. The origin of this size effect is discussed in terms of variation of the electronic structure and of the atomic structure of the Pd clusters.
Spin Noise Fluctuations from Paramagnetic Molecular Adsorbates on Surfaces
Creators: name: Messina, Paolo
name: Mannini, Matteo
name: Caneschi, Andrea
name: Gatteschi, Dante
name: Sorace, Lorenzo
name: Sigalotti, Paolo
name: Sandrin, Cristian
name: Pittana, Paolo
name: Manassen, Yishay
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The measurement of spin noise in nuclei was pioneered on bulk samples more than two decades ago. An ensemble of spins can produce a coherent signal at the frequency of a static magnetic field, known as spin noise, an effect due to the statistical polarization of small ensembles. The difficulty of these measurements is that the signal is extremely small, even if electron spins are detected. Although the statistical polarization of N spins dominates the Boltzmann statistics if N approaches unity, a more sensitive tool is requested to measure the polarization of the magnetic moment of a single spin. In this paper we report on the verification of recent results on the detection of spin noise from paramagnetic molecules of BDPA alpha,gamma,Bisdiphenylene,betha,phenylallyl by Durkan and coworkers. C. Durkan and M. E. Welland, Appl. Phys. Lett. 80, 458 2002 We also present new results on a second paramagnetic specie, DPPH (1,1,Diphenyl,2.picrylhydrazyl), deposited on Au(111) surfaces. ESR spectra from ultrathin films of DPPH and BDPA grown on Au(111) are reported. We prove that the paramagnetic molecules preserve their magnetism on the surface. These data and a thorough analysis of the signal recovery apparatus help to understand the low statistical recurrence of the spin noise in the data set . A thorough description of the experimental apparatus together with an analysis of the parameters that determine the sensitivity are also presented.
description: Figure resolution limited by file size. Contact author for 300*300 dpi pictures
Preprints as accelerator of scholarly communication: An empirical analysis in Mathematics
Creators: name: Wang, Zhiqi
name: Chen, Yue
name: Glänzel, Wolfgang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Digital Libraries (cs.DL)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: In this study we analyse the key driving factors of preprints in enhancing scholarly communication. To this end we use four groups of metrics, one referring to scholarly communication and based on bibliometric indicators (Web of Science and Scopus citations), while the others reflect usage (usage counts in Web of Science), capture (Mendeley readers) and social media attention (Tweets). Hereby we measure two effects associated with preprint publishing: publication delay and impact. We define and use several indicators to assess the impact of journal articles with previous preprint versions in arXiv. In particular, the indicators measure several times characterizing the process of arXiv preprints publishing and the reviewing process of the journal versions, and the ageing patterns of citations to preprints. In addition, we compare the observed patterns between preprints and non-OA articles without any previous preprint versions in arXiv. We could observe that the "early-view" and "open-access" effects of preprints contribute to a measurable citation and readership advantage of preprints. Articles with preprint versions are more likely to be mentioned in social media and have shorter Altmetric attention delay. Usage and capture prove to have only moderate but stronger correlation with citations than Tweets. The different slopes of the regression lines between the different indicators reflect different order of magnitude of usage, capture and citation data.
description: This is the accepted manuscript of the paper being published in Journal of Informetrics. The link to the final published journal version : https://linkinghub.elsevier.com/retrieve/pii/S1751157720300729
On the uniform convexity of L^p
Creators: name: Hanche-Olsen, Harald
Publisher: name: arXiv
Year: 2005
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E30

description: We present a short, direct proof of the uniform convexity of L^p spaces for 1
description: V2: somewhat expanded to improve the exposition
Exact Eigenvalues and Eigenfunctions of the Hulthen Potential in the PT-Symmetry for Any Angular Momentum
Creators: name: Ikhdair, Sameer M.
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Schrodinger equation with the PT-symmetric Hulthen potential is solved exactly by taking into account effect of the centrifugal barrier for any l-state. Eigenfunctions are obtained in terms of the Jacobi polynomials. The Nikiforov-Uvarov method is used in the computations. Our numerical results are in good agreement with the ones obtained before. Keywords: Energy Eigenvalues and Eigenfunctions; Hulthen potential; PT-symmetry; Nikiforov-Uvarov Method.
description: 24 pages
Some statistical properties of multivariate proper dispersion models, with special reference to a multivariate gamma model
Creators: name: Rajeswaran, Jeevanantham
Publisher: name: University of British Columbia
Year: 2009

description: A broad class of error distributions for generalized linear models is provided by the class of dispersion models which was introduced by Jorgensen (1987a, 1997a) and a detailed study on dispersion models was made by Jorgensen (1997b). In this thesis we study multivariate proper dispersion models. Our aim is to do multivariate analysis for non-normal data, particularly data from the multivariate gamma distribution which is an example of a multivariate proper dispersion model, introduced by Jorgensen and Lauritzen (1998). This class provides a multivariate extension of the dispersion model density, following the spirit of the multivariate normal density. We consider the saddlepoint approximation for small dispersion matrices, which, in turn, implies that the multivariate proper dispersion model is approximately multivariate normal for small dispersion matrices. We want to mimic the basic technique of testing in multivariate normal, Hotelling's T². Our version of the T² test applies asymptotically, for either small dispersion or large samples. We also consider estimating the normalizing constant of the bivariate gamma by Monte Carlo simulation and we investigate the marginal density by using numerical integration. We also investigate the distribution of the T²-statistic by Monte Carlo simulation.
Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
Creators: name: Daghero, D.
name: Piatti, E.
name: Zhigadlo, N. D.
name: Ummarino, G. A.
name: Barbero, N.
name: Shiroka, T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Underdoped PrFeAs(O,F), one of the less known members of the 1111 family of iron-based superconductors, was investigated in detail by means of transport, SQUID magnetometry, nuclear magnetic resonance (NMR) measurements and point-contact Andreev-reflection spectroscopy (PCARS). PCARS measurements on single crystals evidence the multigap nature of PrFeAs(O,F) superconductivity, shown to host at least two isotropic gaps, clearly discernible in the spectra, irrespective of the direction of current injection (i.e., along the ab planes or along the c axis). Additional features at higher energy can be interpreted as signatures of a strong electron-boson coupling, as demonstrated by a model which combines Andreev reflection with the Eliashberg theory. Magnetic resonance measurements in the normal phase indicate the lack of a magnetic order in underdoped PrFeAs(O,F), while $^{75}$As NMR spin-lattice relaxation results suggest the presence of significant electronic spin fluctuations, peaking above $T_{c}$ and expected to mediate the superconducting pairing.
description: 12 pages, 9 figures. Title changed, minor amendments in the text
Structure preserving condensed forms for pairs of Hermitian matrices and matrix valued functions
Creators: name: Wunderlich, Lena
Publisher: name: Technische Universität Berlin
Year: 2006
Subjects: subject: 510 Mathematik
subject: Hermitian matrix pairs
subject: pairs of Hermitian matrix valued functions
subject: condensed forms
subject: differential-algebraic systems
subject: strangeness-free formulation

description: The study of matrix pairs or pairs of matrix valued functions is often motivated by applications from linear differential-algebraic equations. In many applications from mechanics or control theory the underlying matrices are symmetric or Hermitian. We study structure preserving condensed forms for pairs of Hermitian matrices and pairs of Hermitian matrix functions. Further, we show how we can derive a structure preserving equivalent strangeness-free system from differential-algebraic equations using the derivative array approach.
title: Meta v Bundeskartellamt: Something Old, Something New
Creators: name: van de Waerdt, Peter J.
Publisher: name: European Papers (www.europeanpapers.eu)
Year: 2024
Subjects: subject: Meta v Bundeskartellamt
subject: competition law
subject: data protection law
subject: digital markets
subject: sincere cooperation
subject: GDPR

description: European Papers - A Journal on Law and Integration, 2023 8(3), 1077-1103
description: European Forum Insight of 8 January 2024
description: I. Introduction - II. From German Competition Decision to EU Judgement - II.1. Bundeskartellamt Decision B6-22/16 of 6 February 2019 - II.2. Judgment of the Court (Grand Chamber) of 4 July 2023 - III. Comment - III.1. Something new: relations between competition law and data protection - III.2. Something borrowed: Meta v Bundeskartellamt and the European Commission - III.3. Something old: arts 6 and 9 GDPR - IV. Concluding remark.
description: Meta v Bundeskartellamt is the culmination of an issue years in the making: the relation between data protection and competition. In contention is the Bka’s finding that Meta’s practice of combining personal data across its many services, in addition to data collected through the integration of its services into third-party websites and apps, constitutes a violation of competition law. In this case, the ECJ holds that a competition authority is at liberty to consider GDPR violations as a “vital clue” to a finding of abuse of dominance, provided it first requested the cooperation of the competent data protection authorities. Furthermore, it finds that, apart from consent, no legal bases from the GDPR justify Facebook’s data processing. Through the principle of sincere cooperation, the Court opens the door to further integration of data protection and competition, acknowledging that data collection is at the core of digital market companies’ business models. Although the case is based on German national law, there is reason to believe that the same line of reasoning could also apply to the European Commission, thus expanding its options in digital market oversight. In contrast, the Court’s analysis of the GDPR is not quite as innovative, but still helpfully lists and reaffirms existing law.
New higher-order generalized uncertainty principle: Applications
Creators: name: Hamil, B.
name: Lütfüoğlu, B. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Last year, Chung and Hassanabadi proposed a higher order general uncertainty principle (GUP$^\ast$) that predicts a minimal length as well as possesses a upper bound momentum limit. In this article, we have discussed an ideal gas system and its thermal properties using that deformed canonical algebra introduced by them. Moreover, we examined blackbody radiation spectrum and the cosmological constant in the presence of the GUP$^\ast$. After a comparison with the existing literature, we concluded that the given formalism of Chung and Hassanabadi yields more accurate results.
description: 12 pages, 7 pages
Sorting with Complete Networks of Stacks
Creators: name: König, Felix G.
name: Lübbecke, Marco E.
Publisher: name: Technische Universität Berlin
Year: 2007
Subjects: subject: 510 Mathematik
subject: stack
subject: sorting
subject: hardness of approximation
subject: PSPACE-complete

description: Knuth introduced the problem of sorting with a sequence of stacks. Tarjan extended this idea to sorting with acyclic networks of stacks (and queues), where items to be sorted move from a source through the network to a sink while they may be stored temporarily at nodes (the stacks). Both characterized which permutations are sortable; but complexity of sorting was not an issue.
SMART: A Situation Model for Algebra Story Problems via Attributed Grammar
Creators: name: Hong, Yining
name: Li, Qing
name: Gong, Ran
name: Ciao, Daniel
name: Huang, Siyuan
name: Zhu, Song-Chun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Solving algebra story problems remains a challenging task in artificial intelligence, which requires a detailed understanding of real-world situations and a strong mathematical reasoning capability. Previous neural solvers of math word problems directly translate problem texts into equations, lacking an explicit interpretation of the situations, and often fail to handle more sophisticated situations. To address such limits of neural solvers, we introduce the concept of a \emph{situation model}, which originates from psychology studies to represent the mental states of humans in problem-solving, and propose \emph{SMART}, which adopts attributed grammar as the representation of situation models for algebra story problems. Specifically, we first train an information extraction module to extract nodes, attributes, and relations from problem texts and then generate a parse graph based on a pre-defined attributed grammar. An iterative learning strategy is also proposed to improve the performance of SMART further. To rigorously study this task, we carefully curate a new dataset named \emph{ASP6.6k}. Experimental results on ASP6.6k show that the proposed model outperforms all previous neural solvers by a large margin while preserving much better interpretability. To test these models' generalization capability, we also design an out-of-distribution (OOD) evaluation, in which problems are more complex than those in the training set. Our model exceeds state-of-the-art models by 17\% in the OOD evaluation, demonstrating its superior generalization ability.
A statistical study of SUMER spectral images: events, turbulence, and intermittency
Creators: name: Buchlin, E.
name: Vial, J. -C.
name: Lemaire, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze a series of full-Sun observations, which was performed with the SoHO/SUMER instrument between March and October 1996. Some parameters (radiance, shift and width) of the S VI 93.3 nm, S VI 94.4 nm, and Lyman Epsilon line profiles were computed on board. Radiances and line-of-sight velocities in a large central region of the Sun are studied statistically: distributions of solar structures, field Fourier spectra and structure functions are obtained. The structures have distributions with power-law tails, the Fourier spectra of the radiance fields also display power laws, and the normalized structure functions of the radiance and velocity fields increase at small scales. These results support the idea of the existence of small scales, created by turbulence, and of intermittency of the observed fields. These properties may provide insight into the processes needed for heating the transition region, or, if confirmed in the corona, the corona itself. The difficulties encountered in this analysis, especially for the velocity data, underline the needs for sensitive ultraviolet imaging spectrometers.
description: 10 pages, 13 figures, Astronomy & Astrophysics, in press
The Maximum Capacity of a Line Plan is Inapproximable
Creators: name: Puhl, Christina
name: Stiller, Sebastian
Publisher: name: Technische Universität Berlin
Year: 2007
Subjects: subject: 510 Mathematik
subject: complexity
subject: approximation
subject: railway optimization
subject: line planning

description: We consider a basic subproblem which arises in line planning with upper capacities: How much can be routed maximally along all possible lines? The essence of this problem is the Path Constrained Network Flow (PCN) problem. We explore the complexity of this problem. In particular we show that it is as hard to approximate as MAX CLIQUE. We also show that the PCN problem is hard for special graph classes, interesting both from a complexity and from a practical perspective. Finally, we present a relevant graph class for which there is a polynomial-time algorithm.
Updated Z-Burst Neutrinos at Horizons
Creators: name: Fargion, D.
name: Oliva, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Recent homogeneous and isotropic maps of UHECR, suggest an isotropic cosmic origin almost uncorrelated to nearby Local Universe prescribed by GZK (tens Mpc) cut-off. Z-Burst model based on UHE neutrino resonant scattering on light relic ones in nearby Hot neutrino Dark Halo, may overcome the absence of such a local imprint and explain the recent correlation with BL Lac at distances of a few hundred Mpc. Z-Burst multiple imprint, due to very possible lightest non-degenerated neutrino masses, may inject energy and modulate UHECR ZeV edge spectra. The Z-burst (and GZK) ultra high energy neutrinos (ZeV and EeV band) may also shine, by UHE neutrinos mass state mixing, and rise in corresponding UHE Tau neutrino flavor, whose charged current tau production and its decay in flight, maybe the source of UHE showering on Earth. The Radius and the atmosphere size of our planet constrains the tau maximal distance and energy to make a shower. These terrestrial tau energies are near GZK energy limit. Higher distances and energies are available in bigger planets; eventual solar atmosphere horizons may amplify the UHE tau flight allowing tau showering at ZeV energies offering a novel way to reveal the expected Z-Burst extreme neutrino fluxes.
description: 6 Pages, 9 figures
From Learning to Relearning: A Framework for Diminishing Bias in Social Robot Navigation
Creators: name: Hurtado, Juana Valeria
name: Londoño, Laura
name: Valada, Abhinav
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The exponentially increasing advances in robotics and machine learning are facilitating the transition of robots from being confined to controlled industrial spaces to performing novel everyday tasks in domestic and urban environments. In order to make the presence of robots safe as well as comfortable for humans, and to facilitate their acceptance in public environments, they are often equipped with social abilities for navigation and interaction. Socially compliant robot navigation is increasingly being learned from human observations or demonstrations. We argue that these techniques that typically aim to mimic human behavior do not guarantee fair behavior. As a consequence, social navigation models can replicate, promote, and amplify societal unfairness such as discrimination and segregation. In this work, we investigate a framework for diminishing bias in social robot navigation models so that robots are equipped with the capability to plan as well as adapt their paths based on both physical and social demands. Our proposed framework consists of two components: \textit{learning} which incorporates social context into the learning process to account for safety and comfort, and \textit{relearning} to detect and correct potentially harmful outcomes before the onset. We provide both technological and societal analysis using three diverse case studies in different social scenarios of interaction. Moreover, we present ethical implications of deploying robots in social environments and propose potential solutions. Through this study, we highlight the importance and advocate for fairness in human-robot interactions in order to promote more equitable social relationships, roles, and dynamics and consequently positively influence our society.
INNER WHORLS OF GREGORYCERAS (AMMONITINA, PELTOCERATINAE) AS THE FIRST OCCURRENCE OF THE GENUS IN MEXICO
Creators: name: BERTHA VILLASEÑOR, ANA
name: OLÓRIZ, FEDERICO
name: LÓPEZ-PALOMINO, ISABEL
Publisher: name: Università degli Studi di Milano
Year: 2004

description: Two nuclei of Gregoryceras are described as the first record of the genus in Mexico. The occurrence in Mexico of the ubiquitous Tethyan genus Gregoryceras is interpreted as related to a major flooding episode that affected neritic shelves in the southern North-American plate.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
Biomimetic Omnidirectional Anti-reflective Glass via Direct Ultrafast Laser Nanostructuring
Creators: name: Papadopoulos, Antonis
name: Skoulas, Evangelos
name: Mimidis, Alexandros
name: Perrakis, George
name: Kenanakis, George
name: Tsibidis, George D.
name: Stratakis, Emmanuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We report on a single-step, biomimetic approach for the realization of omnidirectional transparent antireflective glass. In particular, it is shown that circularly polarized ultrashort laser pulses produce self-organized nanopillar structures on fused silica (SiO2). The laser induced nanostructures are selectively textured on the glass surface in order to mimic the spatial randomness, pillar-like morphology, as well as the remarkable anti-reflection properties found on the wings of the glasswing butterfly, Greta oto[1] and various Cicada species[2]. The artificial structures exhibit impressive anti-reflective properties, both in the visible and infrared frequency range. Accordingly, the laser-processed glass surfaces show reflectivity smaller than 1% for various angles of incidence in the visible spectrum for S-P linearly polarized configurations. While, in the near infrared spectrum, the laser-textured glass shows higher transmittance compared to the pristine. It is envisaged that our current results will revolutionize the technology of anti-reflective transparent surfaces and impact numerous applications from glass displays to optoelectronic devices.
New Length Bounds for Cycle Bases
Creators: name: Elkin, Michael
name: Liebchen, Christian
name: Rizzi, Romeo
Publisher: name: Technische Universität Berlin
Year: 2007
Subjects: subject: 510 Mathematik
subject: minimum cycle basis problem
subject: tree metrics
subject: Deo's conjecture

description: Based on a recent work by Abraham, Bartal and Neiman (2007), we construct a strictly fundamental cycle basis of length O(n2) for any unweighted graph, whence proving the conjecture of Deo et al. (1982).
A Bose-Einstein condensate in an optical lattice with tunable spacing: transport and static properties
Creators: name: Fallani, Leonardo
name: Fort, Chiara
name: Lye, Jessica
name: Inguscio, Massimo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In this Letter we report the investigation of transport and static properties of a Bose-Einstein condensate in a large-spaced optical lattice. The lattice spacing can be easily tuned starting from few micrometers by adjusting the relative angle of two partially reflective mirrors. We have performed in-situ imaging of the atoms trapped in the potential wells of a 20 micrometers-spaced lattice. For a lattice spacing of 10 micrometers we have studied the transport properties of the system and the interference pattern after expansion, evidencing quite different results with respect to the physics of BECs in ordinary near-infrared standing wave lattices, owing to the different length and energy scales.
description: 11 pages, 7 figures, revised version (modified figures, extended text)
Validation of the accuracy and precision of Gaia EDR3 parallaxes with globular clusters
Creators: name: Apellániz, J. Maíz
name: González, M. Pantaleoni
name: Barbá, R. H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: CONTEXT. Gaia EDR3 has produced parallaxes for 1.468x10^9 sources but there are calibration issues that require corrections to the published values and uncertainties. AIMS. We want to characterize the behavior of the uncertainties of the Gaia EDR3 parallaxes. We also aim to provide a procedure for the calculation of distances to stars and stellar clusters. METHODS. We reanalyze some of the data in the calibration papers for QSO and LMC parallaxes and combine those results with measurements for six bright GCs. We calculate the angular covariance of EDR3 parallaxes at small separations based on the LMC results and combine it with the results for larger angles using QSOs to obtain an analytical formula for the angular covariance over the whole sky. The results for the six GCs are used to validate the parallax bias correction as a function of magnitude, color, and ecliptic latitude and to determine the constant used to convert internal uncertainties to external ones. RESULTS. The angular covariance at zero separation is 106.2 muas^2, yielding a minimum uncertainty for EDR3 parallaxes of 10.3 muas for individual stars. That value can be only slightly reduced for GCs after considering the behavior of the angular covariance of the parallaxes for small separations. The Lindegren et al. parallax bias correction works quite well, except for the brighter magnitudes, suggesting improvements may be possible there. The value of k is 1.1-1.7 and depends on G. Stars with moderately large values of RUWE can still provide useful parallaxes albeit with larger values of k. We give accurate and precise Gaia EDR3 distances to the six GCs and for the specific case of 47 Tuc we are able to beat the angular covariance limit and derive a high-precision distance of 4.53+-0.06 kpc. Finally, a recipe for the derivation of distances to stars and stellar clusters using Gaia EDR3 parallaxes is given. [ABRIDGED]
description: Version accepted in A&A
OXFORDIAN BIOSTRATIGRAPHY AND AMMONITE ASSOCIATIONS FROM WEST SICILY: BIOSTRATIGRAPHIC SUCCESSION OF GENUS GREGORYCERAS AND CORRELATION WITH TETHYAN PERISPHINCTID SCALE
Creators: name: D'ARPA, CAROLINA
name: MELÉNDEZ, GUILLERMO
Publisher: name: Università degli Studi di Milano
Year: 2004

description: Middle to lower upper Oxfordian ammonite successions from northwest Sicily, are mainly composed of groups showing a typical Mediterranean character. These include common representatives of suborder Phylloceratina. Among Ammonitina, the bulk of recorded associations is formed by representatives of Mediterranean subfamilies Passendorferiinae, Euaspidoceratinae and Peltoceratinae, with a minor representation of family Oppeliidae. The studied ammonite associations include over two hundred specimens, from which, a whole of one hundred and fifty have been identified and described. They have been collected from three sections located on the southern side of Mount Erice, southwest from the town of Erice (Trapani province).
Taphonomic features displayed by the recorded ammonites indicate, on one hand, sedimentation conditions on an open hemipelagic platform under low turbulence conditions and low sedimentation rate values. On the other hand, Perisphinctid (Passendorferiinae) and Aspidoceratidae assemblages appear dominated by juvenile or pre-adult specimens, indicating palaeobiological entities probably colonizing the area and spreading to epicontinental areas farther North from the southern slope of Tethys. From the biostratigraphic point of view, stratigraphic succession of representatives of genus Gregoryceras has allowed recognising a biostratigraphic succession in the Mediterranean Province, which can closely correlate with the one established with representatives of Passendorferia and Perisphinctes for the Submediterranean Province.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
LATE JURASSIC AND EARLY CRETACEOUS AMMONITES FROM THE WEIMEI FORMATION IN GYANGZE, SOUTHERN TIBET
Creators: name: TAKEI, MASAHIKO
name: MATSUOKA, ATSUSHI
name: YANG, QUN
name: KOBAYASHI, KENTA
name: NAGAHASHI, TOHRU
name: ZENG, QINGGAO
name: WANG, YUJING
name: HE, GUOXIONG
Publisher: name: Università degli Studi di Milano
Year: 2004

description: The Weimei Formation in southern Tibet is a shallow marine sequence accumulated in the northern margin of the Indian subcontinent. It has been dated as Tithonian based on ammonites such as Haplophylloceras strigile (Blanford), Berriasella sp. and Himalayites sp. Six ammonite specimens were found in the type locality of the Weimei Formation. They include Spiticeras (Spiticeras) spitiense (Blanford), Berriasella sp. and Phylloceras sp. The occurrence of S. spitiense indicates that the ammonite-bearing portion is assignable to the Berriasian stage. The Jurassic/Cretaceous boundary possibly exists within the Weimei Formation.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
Multiwavelength Observations of the Extreme X-Ray Selected BL Lac Object PG 1553+11 (1ES 1553+113)
Creators: name: Osterman, M. Angela
name: Miller, H. Richard
name: Campbell, Amy M.
name: Marshall, Kevin
name: McFarland, John P.
name: Aller, Hugh
name: Aller, Margo
name: Fried, Robert E.
name: Kurtanidze, Omar M.
name: Nikolashvili, Maria G.
name: Tornikoski, Merja
name: Valtaoja, Esko
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: PG 1553+11 was the target of a coordinated three week multiwavelength campaign during 2003 April and May. A significant X-ray flare was observed during the second half of this campaign. Although no optical flare was recorded during the X-ray campaign, optical observations obtained immediately prior to the campaign displayed a higher flux than that recorded during the campaign. An optical flare was observed a few days after the end of the X-ray campaign and may be related to the X-ray flare. Radio observations were made at three frequencies, with no significant changes in flux detected near the times of the optical and X-ray flares. The spectral energy distributions and flux ratios in different wavebands observed for this object are compared to other X-ray selected blazars to demonstrate how PG 1553+11 is an extreme member of this group.
description: 28 pages, 4 figures, 7 tables. Accepted for publication in AJ
Rough translation of file VP-291009-01
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-120919-09: Rough translation (minute-by-minute) of file VP-291009-01, recorded by Verdena in October 2009. No transcription in this session, translation only.
Cayley-Hamilton Theorem for Symplectic Quantum Matrix Algebras
Creators: name: Ogievetsky, O.
name: Pyatov, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We establish the analogue of the Cayley--Hamilton theorem for the quantum matrix algebras of the symplectic type.
description: arXiv admin note: text overlap with arXiv:math/0511618
SUBOREAL/BOREAL AMMONITE SUCCESSION AT THE OXFORDIAN/KIMMERIDGIAN BOUNDARY IN THE FLODIGARRY SECTION (STAFFIN BAY, ISLE OF SKYE, UK)
Creators: name: A.MATYJA, BRONIS£AW
name: N.PAGE, KEVIN
name: WIERZBOWSKI, ANDRZEJ
name: K.WRIGHT, JOHN
Publisher: name: Università degli Studi di Milano
Year: 2004

description: The Flodigarry section at Staffin Bay, Isle of Skye, has yielded numerous ammonites both of Subboreal and Boreal affinity. This has enabled close correlation of the Subboreal and Boreal ammonite zonations, and provided new palaeontological data on levels which may be considered as a potential GSSP for the Oxfordian/Kimmeridgian boundary. The traditional Oxfordian/Kimmeridgian boundary placed at the Pseudocordata/Baylei zones boundary of the Subboreal scheme corresponds precisely to the Rosenkrantzi/Bauhini zones boundary of the Boreal scheme: this level is characterized by appearance of Pictonia together with Prorasenia replacing an older assemblage of Ringsteadia-Microbiplices (Subboreal), as well as by first occurrence of small-sized Amoeboceras (Plasmatites) – mostly A. praebauhini (Boreal). A further level which may be considered as the Oxfordian/Kimmeridgian boundary is the boundary between the Bauhini Zone and Kitchini Zone of the Boreal scheme characterized by first occurrence of Amoeboceras (Amoebites) of the A. bayi group. This level corresponds to the Planula/Galar subzones boundary of the Submediterranean scheme, i.e. it lies close to the currently accepted Oxfordian/Kimmeridgian boundary in the Submediterranean Succession.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
BIO- AND LITHOSTRATIGRAPHIC STUDY ON THE LOWER KIMMERIDGIAN OF THE SWABIAN AND FRANCONIAN ALB (GERMANY)
Creators: name: WILHELM SCHICK, HERBERT
Publisher: name: Università degli Studi di Milano
Year: 2004

description: Correlation between Lower Kimmeridgian marly Lacunosamergel Formation of Swabia and the limestone-dominated Arzberg Formation of Franconia was recently carried out successfully. Correlation difficulties in the past were encountered in the Hypselocyclum Zone and in the Divisum Zone ("Balderum-Bank"). Base and top of the Hypselocyclum Zone, sensu Atrops: the Hippolytense Subzone and Perayensis horizon respectively, were correlated with numerous finds of Cymaceras guembeli (Oppel) on the base, and Ardescia perayensis Atrops on the top throughout Franconia and Swabia. For the first time several Aspidoceras (Pseudhimalayites) uhlandi (Oppel) were found in the Swabian Alb above the "Balderum-Bank". These finds help to correct misinterpretations based on the presumed limited vertical range of A. uhlandi in Swabia and the lack of finds of Idoceras balderum (Oppel) in some sections of S Franconia. Now, the widened range of Aspidoceras (P.) uhlandi allows long-distance correlation with the Western Mediterranean Domain sensu Olóriz.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
Finding Paths between Graph Colourings: PSPACE-completeness and Superpolynomial Distances
Creators: name: Bonsma, Paul
name: Cereceda, Luis
Publisher: name: Technische Universität Berlin
Year: 2007
Subjects: subject: 510 Mathematik
subject: vertex recolouring
subject: colour graph
subject: PSPACE-completeness
subject: superpolynomial distance

description: Suppose we are given a graph G together with two proper vertex k-colourings of G, α and β. How easily can we decide whether it is possible to transform α into β by recolouring vertices of G one at a time, making sure we always have a proper k-colouring of G? This decision problem is trivial for k=2, and decidable in polynomial time for k=3. Here we prove it is PSPACE-complete for all k >= 4. In particular, we prove that the problem remains PSPACE-complete for bipartite graphs, as well as for: (i) planar graphs and 4 <= k <= 6, and (ii) bipartite planar graphs and k=4. Moreover, the values of k in (i) and (ii) are tight, in the sense that for larger values of k, it is always possible to recolour α to β. We also exhibit, for every k >= 4, a class of graphs {GN,k:N>0}, together with two k-colourings for each GN,k, such that the minimum number of recolouring steps required to transform the first colouring into the second is superpolynomial in the size of the graph: the minimum number of steps is Ω(2N), whereas the size of GN is O(N2). This is in stark contrast to the k=3 case, where it is known that the minimum number of recolouring steps is at most quadratic in the number of vertices. We also show that a class of bipartite graphs can be constructed with this property, and that: (i) for 4 <= k <= 6 planar graphs and (ii) for k=4 bipartite planar graphs can be constructed with this property. This provides a remarkable correspondence between the tractability of the problem and its underlying structure.
Braneworld black holes as gravitational lenses
Creators: name: Eiroa, Ernesto F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Black holes acting as gravitational lenses produce, besides the primary and secondary weak field images, two infinite sets of relativistic images. These images can be studied using the strong field limit, an analytic method based on a logarithmic asymptotic approximation of the deflection angle. In this work, braneworld black holes are analyzed as gravitational lenses in the strong field limit and the feasibility of observation of the images is discussed.
description: 7 pages, 1 figure, to appear in the Brazilian Journal of Physics (proceedings of the Conference 100 Years of Relativity, Sao Paulo, Brazil, August 2005)
Constraining neutron star radii in black hole-neutron star mergers from their electromagnetic counterparts
Creators: name: Fragione, Giacomo
name: Loeb, Abraham
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Mergers of black hole (BH) and neutron star (NS) binaries are of interest since the emission of gravitational waves (GWs) can be followed by an electromagnetic (EM) counterpart, which could power short gamma-ray bursts. Until now, LIGO/Virgo has only observed a candidate BH-NS event, GW190426\_152155, which was not followed by any EM counterpart. We discuss how the presence (absence) of a remnant disk, which powers the EM counterpart, can be used along with spin measurements by LIGO/Virgo to derive a lower (upper) limit on the radius of the NS. For the case of GW190426\_152155, large measurement errors on the spin and mass ratio prevent from placing an upper limit on the NS radius. Our proposed method works best when the aligned component of the BH spin (with respect to the orbital angular momentum) is the largest, and can be used to complement the information that can be extracted from the GW signal to derive valuable information on the NS equation of state.
description: 6 pages, 3 figures, accepted by MNRAS
The Higgs boson as a gauge field in extra dimensions
Creators: name: Serone, Marco
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I review, at a general non-technical level, the main properties of models in extra dimensions where the Higgs field is identified with some internal component of a gauge field.
description: 4 pages, talk given at the IFAE conference, Catania, Italy, March 30 - April 2 2005; v2: references added
Three measures of fidelity for photon states
Creators: name: Bialynicki-Birula, Iwo
name: Bialynicka-Birula, Zofia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that the standard method of introducing the quantum description of the electromagnetic field -- by canonical field quantization -- is not the only one. We have chosen here the relativistic quantum mechanics of the photon as the starting point. The treatment of photons as elementary particles merges smoothly with the description in terms of the quantized electromagnetic field but it also reveals some essential differences. The most striking result is the appearance of various measures of fidelity for quantum states of photons. These measures are used to characterize the localization of photons.
description: 3 figures
UPPER JURASSIC RADIOLARIANS FROM INICI MOUNTAIN AREA (NORTHWESTERN SICILY, ITALY): BIOCHRONOLOGY AND CALIBRATION BY AMMONITES
Creators: name: BECCARO, PAOLA
Publisher: name: Università degli Studi di Milano
Year: 2004

description: This research is devoted to the biostratigraphic analysis of radiolarian assemblages of the Upper Jurassic intermediate siliceous member of the Rosso Ammonitico Formation in the Inici Mountain area (Northwestern Sicily, Italy). The aims of this paper are to give the first description of this radiolarian associations, to establish a direct biochronostratigraphy by means of radiolarians, and to calibrate radiolarian biozones by ammonite zones. During Late Jurassic time, Inici Mt. area was part of a submerged pelagic plateau characterized by deposition of Rosso Ammonitico condensed facies (Rosso Ammonitico Inferiore -RAI- and Rosso Ammonitico Superiore -RAS-) and basinal facies (Rosso Ammonitico Medio -RAM-). Four stratigraphical sections from the RAM have been studied: Fornazzo Strada, Fornazzo Cava, Castello Inici and Balada di Baida. In all sections RAM consists of siliceous nodular limestone alternating with marly limestone, and moderately preserved radiolarians. Biostratigraphic correlation has been made using the Unitary Associations (UAs) method: 11 UAs have been identified and grouped in 5 biozones (Unitary Associations Zones: UAZs) whose age is calibrated by ammonites found in the same successions and/or in the under- and overlying formations. Ammonite assemblages assign the top of RAI to mid Oxfordian and the top of RAM to upper Kimmeridgian. The ranges of Eucyrtidiellum unumaense (Yao) s.l. and Williriedellum (?) marcucciae Cortese have been extended with respect to those stated in Baumgartner et al. 1995a. Syringocapsidae family is extraordinarily abundant and new morphogroups are presented here: Podobursa sp. A, Podobursa sp. B, Syringocapsa sp. A, Syringocapsa sp. B. Other new morphogroups are: Fultacapsa sphaerica (Ozvoldova) ssp. A, Loopus sp. A, transitional forms between Emiluvia orea Baumgartner and Emiluvia ultima Baumgartner & Dumitrica, transitional forms between Tetratrabs bulbosa Baumgartner and Tetratrabs zealis (Ozvoldova).
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 110, No 1
Subsystem Pseudo-pure States
Creators: name: Cappellaro, P.
name: Hodges, J. S.
name: Havel, T. F.
name: Cory, D. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A critical step in experimental quantum information processing (QIP) is to implement control of quantum systems protected against decoherence via informational encodings, such as quantum error correcting codes, noiseless subsystems and decoherence free subspaces. These encodings lead to the promise of fault tolerant QIP, but they come at the expense of resource overheads. Part of the challenge in studying control over multiple logical qubits, is that QIP test-beds have not had sufficient resources to analyze encodings beyond the simplest ones. The most relevant resources are the number of available qubits and the cost to initialize and control them. Here we demonstrate an encoding of logical information that permits the control over multiple logical qubits without full initialization, an issue that is particularly challenging in liquid state NMR. The method of subsystem pseudo-pure state will allow the study of decoherence control schemes on up to 6 logical qubits using liquid state NMR implementations.
description: 9 pages, 1 Figure
Mehr Verbindlichkeit im Gespräch zwischen charismatischer Bewegung und Kirchen gesucht
Creators: name: Werner, Dietrich
name: Hempelmann, Reinhard
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 44 Nr. 2 (1995): Ökumenische Rundschau, Band 44, Heft 2