cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Understanding Digital Markets: Review and Assessment
Creators: name: Smith, Michael
name: Bailey, Joseph
name: Brynjolfsson, Erik
Publisher: name: Carnegie Mellon University
Year: 1999
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: As the Internet develops into a robust channel for commerce, it will be important to understand the characteristics of electronic markets. Businesses, consumers, government regulators, and academic researchers face a variety of questions when analyzing these nascent markets. Will electronic markets have less friction than comparable conventional markets? What factors lead to dispersion in Internet prices? What are the major electronic commerce developments to watch in the coming years? This paper addresses these questions by reviewing current academic research, discussing the implications of this research, and proposing areas for future study. We review evidence that Internet markets are more efficient than conventional markets with respect to price levels, menu costs, and price elasticity. However, several studies find substantial and persistent dispersion in prices on the Internet. This price dispersion may be explained, in part, by heterogeneity in retailer-specific factors such as trust and awareness. In addition, we note that Internet markets are still in an early stage of development and may change dramatically in the coming years with the development of cross-channel sales strategies, infomediaries and shopbots, improved supply chain management, and new information markets.
Wave trains, solitons and modulation theory in FPU chains
Creators: name: Dreyer, Wolfgang
name: Herrmann, Michael
name: Rademacher, Jens D. M.
Publisher: name: Weierstrass Institute
Year: 2006
Subjects: subject: FPU chain
subject: traveling waves
subject: multiscale ansatz
subject: modulation theory
subject: dispersive shocks
subject: 34E13
subject: 37K60
subject: 70F45
subject: 70K70
subject: 82C21

description: We present an overview of recent results concerning wave trains, solitons and their modulation in FPU chains. We take a thermodynamic perspective and use hyperbolic scaling of particle index and time in order to pass to a macroscopic continuum limit. While strong convergence yields the well-known p-system of mass and momentum conservation, we generally obtain a weak form of it in terms of Young measures. The modulation approach accounts for microscopic oscillations, which we interpret as temperature, causing convergence only in a weak, average sense. We present the arising Whitham modulation equations in a thermodynamic form, as well as analytic and numerical tools for the resolution of the modulated wave trains. As a prototype for the occurrence of temperature from oscillation-free initial data, we discuss various Riemann problems, and the arising dispersive shock fans, which replace Lax-shocks. We predict scaling and jump conditions assuming a generic soliton at the shock front.
Schembria meridionalis Rondani 1861
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Schembria
Schembria meridionalis

description: Schembria meridionalis Rondani, 1861
ORIGINAL DESCRIPTION: 1861e: 111.
 TYPE LOCALITY: “ insula Melita [Malta Island]”.
 TYPE MATERIAL: 1 ♀, syntype (missing right fore-leg) (MZUF: Box 16): Schembria Rnd. / meridionalis Schembri / 851.
 CURRENT STATUS: valid species (Herting & Dely-Draskovits 1993: 235, Cerretti 2010: 250, O’Hara et al. 2020: 507).
 REMARKS: Rondani (1861e: 111) described Schembria meridionalis from just the female sex, without specifying the exact number of specimens, but giving a single measurement of length: “ Foeminam tantum observavi a D. Schembri missam [I observed only the female sent by Mr. Schembri]”. We found one syntype in this study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 354, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Predictors of disability in adolescents and young adults with acquired brain injury after the acute phase
Creators: name: Worm, M.S.
name: Valentin, J.B.
name: Johnsen, S.P.
name: Nielsen, J.F.
name: Forchhammer, H.B.
name: Svendsen, S.W.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Marine Biology
subject: Science Policy

description: To develop and validate a prediction model for disability among young patients with acquired brain injury (ABI) after the acute phase. Within a nationwide cohort of 446 15–30-year-old ABI-patients, we predicted disability in terms of Glasgow Outcome Scale – Extended (GOS-E) <7 12 months after baseline assessment in outpatient neurorehabilitation clinics. We studied 22 potential predictors covering demographic and medical factors, clinical tests, and self-reported fatigue and alcohol/drug consumption. The model was developed using multivariable logistic regression analysis and validated by 5-fold cross-validation and geographical validation. The model’s performance was assessed by receiver operating characteristic curves and calibration plots. Baseline assessment took place a median of 12 months post-ABI. Low GOS-E (range 1–8 (best)) and Functional Independence Measure (range 18–126 (best)) along with high mental fatigue (range 4–20 (worst)) predicted disability. The model showed high validity and performance with an area under the curve of 0.82 (95% confidence interval (CI) 0.77, 0.87) in the cross-validation and 0.81 (95% CI 0.73, 0.88) in the geographical validation. We developed and validated a parsimonious model which effectively predicted disability. The model may be useful to guide decision-making in outpatient neurorehabilitation clinics treating young patients with ABI.
title: ADCO, Cartulaire de Cîteaux pour les possessions de Chaugey et Maison-Dieu (Fin XVe siècle), Cart. 181 (11 H 754), 165 folios, f. 0088
Creators: name: de la Côte d'Or, Archives départementales
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2017
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Cartulaire de Cîteaux pour les possessions de Chaugey et Maison-Dieu (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 181 (11 H 754), 165 folios, f. 0088, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de Cîteaux pour les possessions de Chaugey et Maison-Dieu (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 181 (11 H 754), 165 folios, f. 0088, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
A Type IIB Matrix Model via non-Abelian T-dualities
Creators: name: van Gorsel, Jeroen
name: Zacarias, Salomon
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a new solution of type IIB supergravity with eight supercharges by applying non-Abelian T-duality to the $ AdS_5\times S^5$ solution, along the $ SU(2)$ isometries in both the internal and Lorentz symmetries. The study of quantised charges and D-brane embeddings suggests a configuration of D1 and D3'-branes that polarise into concentric, spherical, D3 and D5-branes due to the Myers dielectric effect. We find that our solution is dual to a IIB matrix model with fuzzy sphere vacua characterised by partitions of the number of D1 and D3'-branes. We also study the solution obtained via (Abelian) T-dualities along the $S^1$ fiber angles inside the $S^3$'s of the $ AdS_5\times S^5$ solution. In addition, we point out a precise relation between NATD and ATD solutions by considering a double scaling limit in the NATD solutions. In the particular case of the solutions obtained by a single (non-)Abelian T-duality inside the Lorentz symmetries of the $AdS_5\times S^5$ solution, we demonstrate that the double scaling limit provides a supergravity realisation of the relations between the vacua of the half-BPS theories studied by Lin and Maldacena.
description: 20 pages, 1 figure, 1 table
Exploring preprint retractions: A case study of arXiv
Creators: name: Zegler-Poleska, Ewa
Publisher: name: Zenodo
Year: 2024
Subjects: Trust and transparency in discarding data: when and how it is de-acquisitioned
Work on automating curation processes
Trust and transparency between universal standards and expectations and that of context and discipline specific adaptations
Building trust and transparency into research and curation techniques, costs, and workflows
Transparency as a means of demonstrating research integrity
Sharing outputs earlier using Open Research platforms
Skills needed for researchers and data stewards to make their practices transparent
Trust and transparency in people, How do we know researchers and data stewards have the skills they need?
Preprints
Retactions
Metadata
Research integrity

description: The rise of preprints, particularly during the pandemic, highlighted their importance in disseminating research. However, maintaining scholarly integrity through retractions poses challenges: journal article retractions are well-established, but preprint retractions lack research and standards. This study investigates over 7,000 retracted preprints on the arXiv platform, aiming to understand retraction reasons and establish guidelines to improve the integrity of scientific communication.
Additional file 1 of Inhibition of miR-153 ameliorates ischemia/reperfusion-induced cardiomyocytes apoptosis by regulating Nrf2/HO-1 signaling in rats
Creators: name: Hou, Wei
name: Zhu, Xianting
name: Liu, Juan
name: Map, Jiaguo
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Pharmacology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Marine Biology
subject: Computational Biology

description: Additional file 1. Additional figures.
Coping with stress before and after mild traumatic brain injury: a pilot hair cortisol study
Creators: name: Spikman, Jacoba M.
name: van der Horn, Harm J.
name: Scheenen, Myrthe E.
name: de Koning, Myrthe E.
name: Savas, Mesut
name: Langerak, Thomas
name: van Rossum, Elisabeth F. C.
name: van der Naalt, Joukje
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Background: Cortisol is a crucial hormone for adaptation to challenging and stressful situations. Hair cortisol measurement is used to determine chronic stress; the growth rate of hair allows to determine averaged cortisol levels for a longer period. Objective: Pre- and post-injury measures of hair cortisol were compared in patients with mild traumatic brain injury (mTBI), and related to their coping styles. Methods: For 46 patients with mTBI, 3 cm scalp hair samples were collected 4–6 weeks post-injury, resulting in two 1 cm segments, pre- and post-injury. Hair samples were also collected for 11 healthy controls. Hair cortisol was quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Complaints, anxiety, depression and coping style were measured two weeks post-injury and long term (six-twelve months), added with measures for post-traumatic stress and functional outcome. Results: There were no differences between patients’ pre- and post-injury cortisol levels, nor between cortisol levels of patients and controls. However, pre- and post-injury cortisol levels of patients were negatively correlated with both passive and an avoidant coping style. Conclusions: Our findings suggest that mTBI has no separate impact on chronic long-term cortisol levels, possibility indicating that variability in cortisol levels reflects individuals’ premorbid characteristics determining coping with stress in general.
Long-term behavior for superprocesses over a stochastic flow
Creators: name: Xiong, Jie
Publisher: name: Weierstrass Institute
Year: 2004
Subjects: subject: Superprocess
subject: stochastic flow
subject: log-Laplace equation
subject: long-term behavior
subject: 60G57
subject: 60H15
subject: 60J80

description: We study the limit of a superprocess controlled by a stochastic flow as $ttoinfty$. It is proved that when $dle 2$, this process suffers long-time local extinction, when $dge 3$, it has a limit which is persistent. The stochastic log-Laplace equation conjectured by Skoulakis and Adler [7] and studied by this author [12] plays a key role in the proofs like the one played by the log-Laplace equation in deriving long-term behavior for usual super-Brownian motion.
U.S. Consumers' Response to FACTA
Creators: name: Zhang, Bin
Publisher: name: Carnegie Mellon University
Year: 2008
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: In December 2003, Congress passed the Fair and Accurate Credit Transaction Act (FACTA) giving US consumers the right to request free annual credit reports. In compliance with this legislation three major US credit bureaus (Equifax, Experian, and TransUnion) began offering free copies of their credit file disclosures to all consumers. The FACTA initiative, as overseen by the Federal Trade Commission, is significant for several reasons: (1) it mandated private companies to offer some of their products and services for free and (2) it was one of the first and largest initiatives by the federal government aiming to alleviate the rising concerns with identity theft. Despite this goal, to date, no data regarding the public response to FACTA has been provided by the FTC or the credit reporting agencies themselves. This paper presents the results of a nationally representative survey of US consumers’ responses to FACTA. This research also provides the first look at the FACTA initiative as well as the motivations for US consumers to request copies of their credit reports. We discuss the factors impacting consumers’ awareness and usage of FACTA. We also identify the factors leading to the consumer opt-in decision to request free credit reports using FACTA. Such information can help us understand the impact of this legislation.
More on the Triplet Killing Potentials of Quaternionic Kaehler Manifolds
Creators: name: Aoyama, Shogo
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show the properties of the triplet Killing potentials of quaternionic Kaehler manifolds which have been missing in the literature. It is done by means of the metric formula of the manifolds. We compute the triplet Killing potentials for the quaternionic Kaehler manifold Sp(n+1)/Sp(n)xSp(1) as an illustration.
description: 13 pages
d-wave resonating valence bond states of fermionic atoms in optical lattices
Creators: name: Trebst, Simon
name: Schollwoeck, Ulrich
name: Troyer, Matthias
name: Zoller, Peter
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study controlled generation and measurement of superfluid d-wave resonating valence bond (RVB) states of fermionic atoms in 2D optical lattices. Starting from loading spatial and spin patterns of atoms in optical superlattices as pure quantum states from a Fermi gas, we adiabatically transform this state to an RVB state by change of the lattice parameters. Results of exact time-dependent numerical studies for ladders systems are presented, suggesting generation of RVB states on timescale smaller than typical experimental decoherence times.
description: 4+ pages, 5 figures
Studies in the statistical and thermal properties of hadronic matter under some extreme conditions
Creators: name: Chase, K. C.
name: Mekjian, A. Z.
name: Meenakshisundaram, P.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The thermal and statistical properties of hadronic matter under some extreme conditions are investigated using an exactly solvable canonical ensemble model. A unified model describing both the fragmentation of nuclei and the thermal properties of hadronic matter is developed. Simple expressions are obtained for quantities such as the hadronic equation of state, specific heat, compressibility, entropy, and excitation energy as a function of temperature and density. These expressions encompass the fermionic aspect of nucleons, such as degeneracy pressure and Fermi energy at low temperatures and the ideal gas laws at high temperatures and low density. Expressions are developed which connect these two extremes with behavior that resembles an ideal Bose gas with its associated Bose condensation. In the thermodynamic limit, an infinite cluster exists below a certain critical condition in a manner similar to the sudden appearance of the infinite cluster in percolation theory. The importance of multiplicity fluctuations is discussed and some recent data from the EOS collaboration on critical point behavior of nuclei can be accounted for using simple expressions obtained from the model.
description: 22 pages, revtex, includes 6 figures, submitted to Phys. Rev. C
Galaxy simulations in the Gaia era
Creators: name: Minchev, Ivan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We live in an age where an enormous amount of astrometric, photometric, asteroseismic, and spectroscopic data of Milky Way stars are being acquired, many orders of magnitude larger than about a decade ago. Thanks to the Gaia astrometric mission and followup ground-based spectroscopic surveys in the next 5-10 years about 10-20 Million stars will have accurate 6D kinematics and chemical composition measurements. KEPLER-2, PLATO, and TESS will provide asteroseismic ages for a good fraction of those. In this article we outline some outstanding problems concerning the formation and evolution of the Milky Way and argue that, due to the complexity of physical processes involved in the formation of disk galaxies, numerical simulations in the cosmological context are needed for the interpretation of Milky Way observations. We also discuss in some detail the formation of the Milky Way thick disk, chemodynamical models, and the effects of radial migration.
description: 8 pages, 3 figures, to appear in proceedings of IAU Symposium 330, eds. Recio-Blanco, de Laverny & Brown
Schineria tergestina Rondani 1857
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Schineria
Schineria tergestina

description: Schineria tergestina Rondani, 1857
ORIGINAL DESCRIPTION: 1857: 12.
 TYPE LOCALITY: “ ad Tergestum [Trieste (Italy)]”.
 TYPE MATERIAL: 1 ♂, syntype (MZUF: Box 10): Schineria Rnd / tergestina Rnd. / 501.
 CURRENT STATUS: valid species (Herting & Dely-Draskovits 1993: 271, Pape et al. 1995: 24, O’Hara et al. 2009: 173, 2020: 870, Cerretti 2010: 305).
 REMARKS: Rondani’s (1857: 12) key for the genus Schineria Rondani, 1856 lists Schineria tergestina as its type species, without specifying the number, sex or length of the specimens, from material received from J.R. Schiner. In his redescription, Rondani (1859b: 46) indicated having collected the male sex. We found one male syntype in this study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 354, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Predicting the X-ray polarization of type-2 Seyfert galaxies
Creators: name: Marin, F.
name: Dovciak, M.
name: Muleri, F.
name: Kislat, F. F.
name: Krawczynski, H. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: J.2.3; J.2.9
subject: 85-06

description: Infrared, optical and ultraviolet spectropolarimetric observations have proven to be ideal tools for the study of the hidden nuclei of type-2 active galactic nuclei (AGN) and for constraining the composition and morphology of the sub-parsec scale emission components. In this paper, we extend the analysis to the polarization of the X-rays from type-2 AGN. Combining two radiative transfer codes, we performed the first simulations of photons originating in the gravity dominated vicinity of the black hole and scattering in structures all the way out to the parsec-scale torus and polar winds. We demonstrate that, when strong gravity effects are accounted for, the X-ray polarimetric signal of Seyfert-2s carries as much information about the central AGN components as spectropolarimetric observations of Seyfert-1s. The spectropolarimetric measurements can constrain the spin of the central supermassive black hole even in edge-on AGN, the hydrogen column density along the observer's line-of-sight, and the composition of the polar outflows. However, the polarization state of the continuum source is washed out by multiple scattering, and should not be measurable unless the initial polarization is exceptionally strong. Finally, we estimate that modern X-ray polarimeters, either based on the photo-electric effect or on Compton scattering, will require long observational times on the order of a couple of mega-seconds to be able to properly measure the polarization of type-2 AGN.
description: 32 pages, 24 figures, accepted for publication in MNRAS
Energetic particle acceleration in a 3D magnetic field reconnection model: a role of MHD turbulence
Creators: name: Kobak, Tomasz
name: Ostrowski, Michal
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The role of MHD turbulence in the cosmic ray acceleration process in a volume with a reconnecting magnetic field is studied by means of Monte Carlo simulations. We performed modelling of proton acceleration with the 3D analytic model of stationary reconnection of Craig et al. (1995) providing the unperturbed background conditions. Perturbations of particle trajectories due to a turbulent magnetic field component were simulated using small-amplitude pitch-angle momentum scattering, enabling modelling of both small and large amplitude turbulence in a wide wave vector range. Within the approach, no second-order Fermi acceleration process is allowed. Comparison of the acceleration process in models involving particle trajectory perturbations to the unperturbed one reveals that the turbulence can substantially increase the acceleration efficiency, enabling much higher final particle energies and flat particle spectra.
description: 6 pages, 6 figures, MNRAS - accepted
Nonlinear estimation for linear inverse problems with error in the operator
Creators: name: Hoffmann, Marc
name: Reiß, Markus
Publisher: name: Weierstrass Institute
Year: 2004
Subjects: subject: statistical inverse problem
subject: Galerkin projection method
subject: wavelet thresholding
subject: minimax rate
subject: degree of ill-posedness
subject: matrix compression
subject: 65J20
subject: 62G07

description: We consider nonlinear estimation methods for statistical inverse problems in the case where the operator is not exactly known. For a canonical formulation a Gaussian operator white noise framework is developed. Two different nonlinear estimators are constructed, which correspond to the different order of the linear inversion and nonlinear smoothing step. We show that both estimators are rate-optimal over a wide range of Besov smoothness classes. The construction is based on the Galerkin projection method and wavelet thresholding schemes for the data and the operator.
Tweets Are Forever: A Large-Scale Quantitative Analysis of Deleted Tweets
Creators: name: Almuhimedi, Hazim
name: Shomir  Wilson
name: Liu, Bin
name: Sadeh-Koniecpol, Norman
name: Acquisti, Alessandro
Publisher: name: Carnegie Mellon University
Year: 2013
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: This paper describes an empirical study of 1.6M deleted tweets collected over a continuous one-week period from a set of 292K Twitter users. We examine several aggregate properties of deleted tweets, including their connections to other tweets (e.g., whether they are replies or retweets), the clients used to produce them, temporal aspects of deletion, and the presence of geotagging information. Some significant differences were discovered between the two collections, namely in the clients used to post them, their conversational aspects, the sentiment vocabulary present in them, and the days of the week they were posted. However, in other dimensions for which analysis was possible, no substantial differences were found. Finally, we discuss some ramifications of this work for understanding Twitter usage and management of one’s privacy.
Nanoscale mapping of ultrafast magnetization dynamics with femtosecond Lorentz microscopy
Creators: name: da Silva, Nara Rubiano
name: Möller, Marcel
name: Feist, Armin
name: Ulrichs, Henning
name: Ropers, Claus
name: Schäfer, Sascha
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Novel time-resolved imaging techniques for the investigation of ultrafast nanoscale magnetization dynamics are indispensable for further developments in light-controlled magnetism. Here, we introduce femtosecond Lorentz microscopy, achieving a spatial resolution below 100 nm and a temporal resolution of 700 fs, which gives access to the transiently excited state of the spin system on femtosecond timescales and its subsequent relaxation dynamics. We demonstrate the capabilities of this technique by spatio-temporally mapping the light-induced demagnetization of a single magnetic vortex structure and quantitatively extracting the evolution of the magnetization field after optical excitation. Tunable electron imaging conditions allow for an optimization of spatial resolution or field sensitivity, enabling future investigations of ultrafast internal dynamics of magnetic topological defects on 10-nanometer length scales.
Dewetting rates of thin liquid films
Creators: name: Münch, Andreas
Publisher: name: Weierstrass Institute
Year: 2004
Subjects: subject: Lubrication approximation
subject: slippage
subject: 76A20
subject: 76D27
subject: 68.15.+e
subject: 47.15.Gf
subject: 68.03.Kn
subject: 68.03.Cd

description: We investigate the dewetting rates of thin liquid films using a lubrication model that describes the dewetting process of polymer melts on hydrophobized substrates. We study the effect of different boundary conditions at the liquid/solid interface, in particular, of the no-slip and the Navier slip boundary condition, and compare our numerical solutions for the no-slip and the slip dominated cases to available results that originate from scaling arguments, simplified flow assumptions and energy balances. We furthermore consider these issues for an extended lubrication model that includes nonlinear curvature.
Siphona chetoliga Rondani 1865
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Siphona
Siphona chetoliga

description: Siphona chetoliga Rondani, 1865
ORIGINAL DESCRIPTION: 1865c: 194.
 TYPE LOCALITY: “ in Alpibus [Alps]”.
 TYPE MATERIAL: 1 ♀, holotype (missing mid-legs) (MZUF: Box 9): Siphona Mg. Bucentes Latr. / chetolyga [sic !] Rnd., Alpi / 433 / Siphona geniculata (DeGeer), det. Stig. Andersen.
 CURRENT STATUS: junior synonym of Siphona cristata (Fabricius, 1805) (Herting & Dely-Draskovits 1993: 334); junior synonym of Siphona geniculata (De Geer, 1776) (Andersen 1996: 94).
 REMARKS: Rondani (1865c 194) described Siphona chetoliga from just the female sex, without specifying either the number or the length of the specimens. Andersen (1996: 94) considered the single MZUF female as the holotype.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 354, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Spinon deconfinement in doped frustrated quantum antiferromagnets
Creators: name: Poilblanc, Didier
name: Laeuchli, Andreas
name: Mambrini, Matthieu
name: Mila, Frederic
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The confinement of a spinon liberated by doping two-dimensional frustrated quantum antiferromagnets with a non-magnetic impurity or a mobile hole is investigated. For a static vacancy, an intermediate behavior between complete deconfinement (kagome) and strong confinement (checkerboard) is identified in the J_1{-}J_2{-}J_3 model on the square lattice, with the emergence of two length scales, a spinon confinement length larger than the magnetic correlation length. For mobile holes, this translates into an extended spinon-holon boundstate allowing one to bridge momentum (ARPES spectral function) and real space (STM) experimental observations. These features provide clear evidence for a nearby "deconfined critical point" in a doped microscopic model.
description: Revised manuscript -- Ref. 26 added
Analysis of Four A-F Supergiants in M31 from Keck HIRES Spectroscopy
Creators: name: Venn, Kim A.
name: McCarthy, J. K.
name: Lennon, D. J.
name: Przybilla, N.
name: Kudritzki, R. P.
name: Lemke, M.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first stellar abundances in M31 are presented, based on Keck I HIRES spectroscopy and model atmospheres analyses of three A-F supergiants, 41-2368, 41-3712, and A-207. We also present the preliminary analysis of a fourth star, 41-3654. We find that the stellar oxygen abundances are in good agreement with those determined from nebular studies, even though the stars do {\it not} show a clear radial gradient in oxygen. The uncertainties in the stellar abundances are smaller than the range in the nebular results, making these stars ideal objects for further studies of the distribution of oxygen in M31. We show that the stars can be used to study the abundance distributions of other elements as well, including iron-group and heavier elements. The A-F supergiants also provide direct information on the metallicity and reddening of nearby Cepheid stars. We have examined the metallicity and reddening assumptions used for Cepheids within 1' of our targets and noted the differences from values used in the literature.
description: Accepted for publication in the ApJ, October 2000 (23 pages, 4 tables, 11 figures)
Characterization of Near-Earth Asteroids using KMTNet-SAAO
Creators: name: Erasmus, N.
name: Mommert, M.
name: Trilling, D. E.
name: Sickafoose, A. A.
name: van Gend, C.
name: Hora, J. L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present here VRI spectrophotometry of 39 near-Earth asteroids (NEAs) observed with the Sutherland, South Africa, node of the Korea Microlensing Telescope Network (KMTNet). Of the 39 NEAs, 19 were targeted, but because of KMTNet's large 2 deg by 2 deg field of view, 20 serendipitous NEAs were also captured in the observing fields. Targeted observations were performed within 44 days (median: 16 days, min: 4 days) of each NEA's discovery date. Our broadband spectrophotometry is reliable enough to distinguish among four asteroid taxonomies and we were able to confidently categorize 31 of the 39 observed targets as either a S-, C-, X- or D-type asteroid by means of a Machine Learning (ML) algorithm approach. Our data suggest that the ratio between "stony" S-type NEAs and "not-stony" (C+X+D)-type NEAs, with H magnitudes between 15 and 25, is roughly 1:1. Additionally, we report ~1-hour light curve data for each NEA and of the 39 targets we were able to resolve the complete rotation period and amplitude for six targets and report lower limits for the remaining targets.
Trade Reform and Regional Dynamics: Evidence From 25 Years of Brazilian Matched Employer-Employee Data
Creators: name: Dix-Carneiro, Rafael
name: Kovak, Brian
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: We empirically study the dynamics of labor market adjustment following the Brazilian trade reform of the 1990s. We use variation in industry-specific tariff cuts interacted with initial regional industry mix to measure trade-induced local labor demand shocks, and then examine regional and individual labor market responses to those one-time shocks over two decades. Contrary to conventional wisdom, we do not find that the impact of local shocks is dissipated over time through wage-equalizing migration. Instead, we find steadily growing effects of local shocks on regional formal sector wages and employment for 20 years. This finding can be rationalized in a simple equilibrium model with two complementary factors of production, labor and industry-specific factors such as capital, that adjust slowly and imperfectly to shocks. Next, we document rich margins of adjustment induced by the trade reform at the regional and individual level. Workers initially employed in harder hit regions face continuously deteriorating formal labor market outcomes relative to workers employed in less affected regions, and this gap persists even 20 years after the beginning of trade liberalization. Negative local trade shocks induce workers to shift out of the formal tradable sector and into the formal nontradable sector. Non-employment strongly increases in harder-hit regions in the medium run, but in the longer run, non-employed workers eventually find re-employment in the informal sector. Working age population does not react to these local shocks, but formal sector net migration does, consistent with the relative decline of the formal sector and growth of the informal sector in adversely affected regions.
On accurate domination in graphs
Creators: name: Cyman, Joanna
name: Henning, Michael A.
name: Topp, Jerzy
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C69, 05C05, 05C75, 05C76

description: A dominating set of a graph $G$ is a subset $D \subseteq V_G$ such that every vertex not in $D$ is adjacent to at least one vertex in $D$. The cardinality of a smallest dominating set of $G$, denoted by $γ(G)$, is the domination number of $G$. The accurate domination number of $G$, denoted by $γ_{\rm a}(G)$, is the cardinality of a smallest set $D$ that is a dominating set of $G$ and no $|D|$-element subset of $V_G \setminus D$ is a dominating set of $G$. We study graphs for which the accurate domination number is equal to the domination number. In particular, all trees $G$ for which $γ_{\rm a}(G) = γ(G)$ are characterized. Furthermore, we compare the accurate domination number with the domination number of different coronas of a graph.
description: 12 pages, 1 figure
Formation of $Σπ$ pairs in nuclear captures of K$^-$ mesons
Creators: name: Del Grande, Raffaele
name: Piscicchia, Kristian
name: Wycech, Slawomir
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The capture of K$^-$ mesons on nucleons bound in nuclei offer a chance to study the $Σπ$ pairs below the kinematic threshold of the $\bar{\mathrm{K}}$N systems. Various hyperon-pion charged combination are presently under investigation by AMADEUS. These data allow to test both isospin 0 and 1 amplitudes giving the possibility to detect the structure of resonant $Λ$(1405) state. Contrasted against similar electro-production data, it is possible to detect changes of $Λ$(1405) in nuclear media. Expected spectra and their uncertainties are calculated.
Trade Liberalization and the Skill Premium: A Local Labor Markets Approach
Creators: name: Dix-Carneiro, Rafael
name: Kovak, Brian
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: Trade economists have long studied the effects of globalization on wage differences between workers with different levels of skill or education. This literature has generally sought to link globalization to changes in the economy-wide skill premium. Attanasio et al. (2004) and Gonzaga et al. (2006) are salient examples that investigate whether changes in sector-specific prices or tariffs, changes in skill composition within and across sectors, and movements in the skill premium are consistent with the predictions of workhorse trade models, such as the Heckscher-Ohlin model. However, there is little evidence directly establishing a causal effect of globalization on the skill premium. More recently, a growing body of research has focused on trade’s differential effects across local markets within a country. In this paper, we combine these two strands of literature by developing a theoretically consistent approach to studying the causal effect of trade liberalization on the skill premium at the local level.
Tropicalization, symmetric polynomials, and complexity
Creators: name: Woo, Alexander
name: Yong, Alexander
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: Computational Complexity (cs.CC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: D. Grigoriev-G. Koshevoy recently proved that tropical Schur polynomials have (at worst) polynomial tropical semiring complexity. They also conjectured tropical skew Schur polynomials have at least exponential complexity; we establish a polynomial complexity upper bound. Our proof uses results about (stable) Schubert polynomials, due to R. P. Stanley and S. Billey-W. Jockusch-R. P. Stanley, together with a sufficient condition for polynomial complexity that is connected to the saturated Newton polytope property.
description: 8 pages
Hubble Diagrams in the Jordan and Einstein Frames
Creators: name: Rashidi, Reza
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Different models in cosmology generally predict different Hubble diagrams. Then, the comparison between the Hubble diagrams may be used as a way for distinguishing between different cosmological scenarios. But that is not always the case because there is no guarantee that two different models always have different Hubble diagrams. It may be possible for two physically-inequivalent models to have the same Hubble diagrams. In that case, the Hubble diagram cannot be used to differentiate between two models and it is necessary to find another way to distinguish between them. Therefore, the question of whether two different scenarios are distinguishable by using the Hubble diagrams is an important question which would not have an obvious answer. The Jordan and Einstein frames of $f(R)$ theories of gravity are inequivalent, provided that the metricity condition holds in both frames. In the present paper it is argued that if the time-variation of particle masses in the Einstein frame is taken into consideration, the Hubble diagram derived practically from type Ia supernova surveys does not enable us to differentiate between these two frames. Nevertheless, we show that by waiting long enough to measure the change in Hubble diagram it is possible to differentiate between two frames. In other words, the Hubble diagram cannot be employed alone to differentiate between two frames but comparison between the rates of changes in Hubble diagrams can provide a way to do so.
description: 14 pages
Searching for research data – an assessment of data publication practises at Stockholm University
Creators: name: Almbro, Maria
name: Olsson, Lisa
Publisher: name: Zenodo
Year: 2024
Subjects: Skills needed for researchers and data stewards to make their practices transparent
Open data
data publication
data availability
FAIR
repositories

description: In Sweden, the aim is to make all research data FAIR and openly available (when possible) by 2026. With 2026 being only two years away, little is still known about the current practices and the state of open data publishing. This poster presents an overview of the data publishing routes and transparent practises used by SU researchers in our study.
SIMEX and TLS: An equivalence result
Creators: name: Polzehl, Jörg
name: Zwanzig, Silvelyn
Publisher: name: Weierstrass Institute
Year: 2004
Subjects: subject: Errors-in-variables
subject: SIMEX
subject: Moment estimator
subject: Total Least Squares
subject: 62F12
subject: 62J05

description: SIMEX was introduced by Cook and Stefanski (1994) as a simulation type estimator in errors-in-variables models. The idea of the SIMEX procedure is to compensate for the effect of the measurement errors while still using naive regression estimators. Polzehl and Zwanzig (2004) defined a symmetrized version of this estimator. In this paper we establish some results relating these two simulation-extrapolation-type estimators to well known consistent estimators like the total least squares estimator (TLS) and the moment estimator (MME) in the context of errors-in-variables models. We further introduce an adaptive SIMEX (ASIMEX), which is calculated like SIMEX, but based on an estimated variance. The main result of this paper is that SYMEX, ASIMEX are equivalent to TLS. Additionally we see that SIMEX is equivalent to the moment estimator.
Toward a Shared Economic Vision for Pittsburgh a Southwestern Pennsylvania: A White Paper Update
Creators: name: Gleeson, Robert E.
Publisher: name: Carnegie Mellon University
Year: 1994
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: 160510 Public Policy
subject: FOS: Political science

description: Heinz College paper
First Passage Time Densities in Non-Markovian Models with Subthreshold Oscillations
Creators: name: Verechtchaguina, T.
name: Sokolov, I. M.
name: Schimansky-Geier, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Motivated by the dynamics of resonant neurons we consider a differentiable, non-Markovian random process $x(t)$ and particularly the time after which it will reach a certain level $x_b$. The probability density of this first passage time is expressed as infinite series of integrals over joint probability densities of $x$ and its velocity $\dot{x}$. Approximating higher order terms of this series through the lower order ones leads to closed expressions in the cases of vanishing and moderate correlations between subsequent crossings of $x_b$. For a linear oscillator driven by white or coloured Gaussian noise, which models a resonant neuron, we show that these approximations reproduce the complex structures of the first passage time densities characteristic for the underdamped dynamics, where Markovian approximations (giving monotonous first passage time distribution) fail.