cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Publications Router: populating repositories automatically
Creators: name: Byford, Steve
name: Rehin, Adam
name: Bollini, Andrea
name: Pascarelli, L. Andrea
name: Mornati, Susanna
Publisher: name: Zenodo
Year: 2021
Subjects: DSpace, Publications Router, RIOXX, REF, Interoperability, Open access, Open research

description: Institutions around the world have wrestled with how to be as efficient as possible in making their researchers’ articles openly available on their repositories. They use a variety of systems and workflows to try to achieve this.
 For UK institutions, Jisc’s Publications Router service works with publishers to capture articles, match them to their authors’ institutions and deliver them directly into the relevant repositories. It is now interoperable with a wider range of systems that institutions use, including research information management systems and CRISs, as well as repositories.
 Collaboration with 4Science, who have developed the relevant patches for the latest DSpace versions, means that Router can now deliver the full richness of RIOXX metadata fields (as well as full-text articles) into recent versions of DSpace. Parallel work includes compliance with the Research Excellence Framework (REF) in the UK, demonstrating the value of institutional repositories for research evaluation as well.
 Although currently aimed at UK institutions, Jisc would like to enable Router to serve institutions in additional territories. We look at some of the challenges and opportunities this will entail.
description: Presented at the OR2021 conference online, 9 June 2021
An SO(5) Symmetric Ladder
Creators: name: Scalapino, D.
name: Zhang, Shou-Cheng
name: Hanke, W.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We construct an SO(5) symmetric electron model on a two-chain ladder with purely local interactions on a rung. The ground state phase diagram of this model is determined in the strong-coupling limit. The relationship between the spin-gap magnon mode of the spin-gap insulator and the $π$ resonance mode of the d-wave pairing phase is discussed. We also present the exact ground state for an SO(5) superspin model.
description: 28 pages including figures
Quantum Entangled Supercorrelated States in the Jaynes-Cummings Model
Creators: name: Rajagopal, A. K.
name: Jensen, K. L
name: Cummings, F. W.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The regions of independent quantum states, maximally classically correlated states, and purely quantum entangled (supercorrelated) states described in a recent formulation of quantum information theory by Cerf and Adami are explored here numerically in the parameter space of the well-known exactly soluable Jaynes-Cummings model for equilibrium and nonequilibrium time-dependent ensembles.
description: 12 pages, 3 figures
Additional file 1: of Three-dimensional quantitative assessment of palatal bone height for insertion of orthodontic implants - a retrospective CBCT study
Creators: name: Chhatwani, Sachin
name: Rose-Zierau, Viola
name: Haddad, Bassel
name: Almuzian, Mohammed
name: Kirschneck, Christian
name: Gholamreza Danesh
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology

description: Table S1. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for the total study population (N = 180). Table S2. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for men (N = 85). Table S3. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for women (N = 95). Table S4. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for age group 8-12 years (N = 33). Table S5. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for age group 13-16 years (N = 43). Table S6. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for age group 17-21 years (N = 51). Table S7. Palatal bone height (mm) at the 88 evaluated sites (P1-P88) for age group 22-40 years (N = 54). (DOCX 59 kb)
Arbitrary Shaped Acoustic Concentrators Enabled by Nihility Media
Creators: name: Fakheri, Mohammad Hosein
name: Sedeh, Hooman Barati
name: Abdolali, Ali
Publisher: name: arXiv
Year: 2018
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Based on the transformation acoustics (TA) methodology, an innovative approach for designing arbitrary shape concentrators is proposed. unlike previous works, which utilized inhomogenous and anisotropic materials to localize the incident waves in an arbitrary domain, the same functionality will be attained by introducing only one homogenous anisotropic medium, which is called acoustic nihility media (ANM). A great advantage of this method is that the attained materials are not dependent on the shape of the concentrator. That is regardless of the device geometry, a constant ANM will be used for each new shape and the output results do not alter. This will circumvent the conventional transformation acoustics' sophisticated and tedious calculations and could be easily implemented in real life scenarios.
description: 8 pages, 5 figures
A novel design for cruiser type motorcycle silencer based on micro perforated elements
Creators: name: Kabral, R.
name: Rämmal, H.
name: Auriemma, F.
name: Luppin, J.
name: Koiv, R.
name: Tiikoja, H.
name: Lavrentjev, J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: ...Micro perforated elements are innovative acoustic solutions,which silencing effect is based on the dissipation of the acoustic wave energy in a pattern of sub-millimeter apertures. Similarly to fibrous materials the micro-perforated materials have been proved to provide effective sound absorption in a wide frequency range. Additionally, the silencer is designed as a two-stage system that provides an optimal solution for a variety of exploitation conditions. In this paper a novel design for a cruiser type motorcycle silencer, based on micro-perforated elements, is presented. It has been demonstrated that the micro-perforated elements can successfully be used to achieve high attenuation of IC-engine noise in strictly limited circumstances. A technical description of the design and manufacturing of the prototype silencer is given and technological issues are discussed. The acoustical and fluid-dynamical performance of the silencer is characterized by transmission loss and pressure drop data. The influence of the two-stage system valve operation has been analyzed by studying the acoustics data and engine output characteristics. In addition to the experimental investigations, numerical 1-D models were developed for the optimization of the silencer geometry and the results are compared in a number of operating conditions. The studies have resulted in development of a silencer system for a small series cruiser type motorcycle. The first silencer prototypes have been tested on the motorcycle. While maintaining acceptable pressure drop characteristics, it has proven to comply with standard noise criteria without incorporating fibrous materials....
ORCID AND OPENAIRE COMPLIANCE FOR DSPACE: OR2021
Creators: name: Roy, William
name: Matthews, Courtney
name: Bollini, Andrea
name: Pascarelli, L. Andrea
name: Mornati, Susanna
name: Shearer, Kathleen
name: Lasou, Pierre
Publisher: name: Zenodo
Year: 2021
Subjects: DSpace
OpenAIRE
ORCID
OAI-PMH
Interoperability

description: Members of the Canadian Association of Research Libraries’ Open Repositories Working Group (CARL-ORWG) have a common goal of making research outcomes generated at their universities openly available to the global knowledge commons. In 2018 a subset of CARL-ORWG led by Queen’s University pooled their resources and hired 4Science to develop code to make aggregation from DSpace current versions (5 & 6) into OpenAire possible. In discussions with 4Science it was proposed and decided that this development work include a patch for adding ORCIDs to the required OAI-PMH feed. This presentation will provide background on this completed work including the principles and goals for open research shared by CARL members and 4Science and the details of the ORCID patch. DSpace is the most popular open source repository platform in the world and this implementation will bring benefit to the vast global community using the latest versions of DSpace, besides providing guidance and inspiration to other communities.
Additional file 2: of Patient involvement in clinical trials: motivation and expectations differ between patients and researchers involved in a trial on urinary tract infections
Creators: name: Schilling, Imke
name: Behrens, Heike
name: Hugenschmidt, Claudia
name: Liedtke, Jennifer
name: Schmiemann, Guido
name: Gerhardus, Ansgar
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Marine Biology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: FOS: Biological sciences
subject: Computational Biology

description: GRIPP2 Checklist, PDF file. (DOCX 107 kb)
Additional file 1: of Patient involvement in clinical trials: motivation and expectations differ between patients and researchers involved in a trial on urinary tract infections
Creators: name: Schilling, Imke
name: Behrens, Heike
name: Hugenschmidt, Claudia
name: Liedtke, Jennifer
name: Schmiemann, Guido
name: Gerhardus, Ansgar
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Marine Biology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: COREQ (COnsolidated criteria for REporting Qualitative research) checklist, PDF file. (PDF 6219 kb)
f(R) gravity theory and CMBR constraints
Creators: name: Hwang, J.
name: Noh, H.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the large-scale cosmic structure generation by an inflation based on a pure f(R)-type gravity theory. Comparison with recent CMBR observations gives the following results: (1) The near Zel'dovich spectral conditions uniquely choose R^2-type gravity. (2) The R^2 gravity predicts specific nearly scale-invariant Zel'dovich spectra for both the scalar- and tensor-type perturbations. Thus, (3) the considered model survives current observational data. The COBE-DMR quadrupole data (4) give constraints on the coupling constant and the energy scale during inflation, and (5) require the gravitational wave contribution to be suppressed. (6) Therefore, future observations of (2) and (5) can provide strong tests of the inflation scenario based on R^2 gravity. Parallel analyses made in the conformally transformed Einstein frame give the observationally identical results.
description: 6 pages, to appear in Phys. Lett. B
Realizing Magnetoelectric Coupling with Hydroxide as a Knob
Creators: name: Ni, J. Y.
name: Wang, P. S.
name: Lu, J. L.
name: Xiang, H. J.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Materials with a coexistence of magnetic and ferroelectric order (i.e., multiferroics) provide an efficient route for the control of magnetism by electric fields. Unfortunately, a long-sought room temperature multiferroic with strongly coupled ferroelectric and ferromagnetic (or ferrimagnetic) orderings is still lacking. Here, we propose that hydrogen intercalation in antiferromagnetic transition metal oxides is a promising way to realize multiferroics with strong magnetoelectric coupling. Taking brownmillerite SrCoO2.5 as an example, we show that hydrogen intercalated SrCoO2.5 displays strong ferrimagnetism and large electric polarization in which the hydroxide acts as a new knob to simultaneously control the magnetization and polarization at room temperature. We expect that ion intercalation will become a general way to design magnetoelectric and spintronic functional materials.
A generalized Hamiltonian Constraint Operator in Loop Quantum Gravity and its simplest Euclidean Matrix Elements
Creators: name: Gaul, Marcus
name: Rovelli, Carlo
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a generalized version of the Hamiltonian constraint operator in nonperturbative loop quantum gravity. The generalization is based on admitting arbitrary irreducible SU(2) representations in the regularization of the operator, in contrast to the original definition where only the fundamental representation is taken. This leads to a quantization ambiguity and to a family of operators with the same classical limit. We calculate the action of the Euclidean part of the generalized Hamiltonian constraint on trivalent states, using the graphical notation of Temperley-Lieb recoupling theory. We discuss the relation between this generalization of the Hamiltonian constraint and crossing symmetry.
description: 35 pp, 20 eps figures; minor corrections, references added; version to appear in Class. Quant. Grav
Electron-impact excitation and ionization of atomic calcium at intermediate energies
Creators: name: Zatsarinny, Oleg
name: Parker, Henry
name: Bartschat, Klaus
Publisher: name: arXiv
Year: 2018
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a comprehensive study of electron collisions with calcium atoms by using the convergent \emph{B}-spline \emph{R}-matrix method. Elastic, excitation, and ionization cross sections were obtained for all transitions between the lowest 39 physical states of calcium (except for $3p^6 4s5g\ ^{3,1}G$) up to the $3p^6 4s8s\ ^1S$ state, for incident electron energies ranging from threshold to 100~eV. A multi\-configuration Hartree-Fock method with non\-orthogonal term-dependent orbitals was employed to generate accurate wave functions for the target states. Close-coupling expansions including the 39 physical states plus 444 pseudo-target states of calcium were used to check the sensitivity of the results to coupling to the target continuum. The cross-section dataset obtained from the large-scale calculations is expected to be sufficiently accurate and comprehensive for most current modeling applications involving neutral calcium.
description: 9 pages, 9 figures
Charge ordering and spin- Peierls transition in alpha'-NaV2O5
Creators: name: Thalmeier, P.
name: Fulde, P.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent X-ray analysis and NMR- experiments have shown that alpha'- NaV2O5 is not a conventional spin-Peierls (SP) compound because above the transition at 33K it is in a homogeneous mixed valent (MV) state and atomic spin chains do not exist. Furthermore, thermal expansion experiments have identified the existence of a double phase transition. We present a theoretical model which qualitatively explains these observations. We derive an effective Hamiltonian for the insulating state which describes the transitions as primary charge order leading to linear spin chains in b- direction and a secondary SP- transition. We show that this scenario explains in a natural way the anomalous BCS-ratio observed in alpha'- NaV2O5.
description: 10 pages, 2 figures, accepted for publication in Europhysics Letters
Variable 21cm absorption at z=0.3127
Creators: name: Kanekar, Nissim
name: Chengalur, Jayaram N
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report multi-epoch GMRT HI observations of the z = 0.3127 damped absorber towards the quasar PKS 1127-145, which reveal variability in both the absorption profile and the flux of the background source, over a time-scale of a few days. The observed variations cannot be explained by simple inter-stellar scintillation (ISS) models where there are only one or two scintillating components and all of the ISS occurs in the Galaxy. More complicated models where there are either more scintillating components or some of the ISS occurs in the ISM of the z=0.3127 absorber may be acceptable. However, the variability can probably best be explained in models incorporating motion (on sub-VLBI scales) of a component of the background continuum source, with or without some ISS. All models for producing the variable 21cm absorption profile require small scale variations in the 21cm optical depth of the absorber. The length scale for the opacity variations is $\sim 0.1$ pc in pure super-luminal motion models, and $\sim$ 10 pc in pure ISS models. Models involving sub-luminal motion, combined with scintillation of the moving component, require opacity variations on far smaller scales, $\sim$ 10 - 100 AU.
description: 5 pages, 2 figures. Accepted for publication in MNRAS
Shared repositories: building (multi-tenancy) repository services at the British Library
Creators: name: Basford, Jenny
name: Gould, Sara
name: Reimer, Torsten
Publisher: name: Zenodo
Year: 2021
Subjects: Samvera Hyku
shared repository
multi-tenancy
OR2021

description: In 2018, a report by the Universities UK Open Access Repositories Working Group raised concerns about repository sustainability and proposed a range actions that could support open repositories. It also posed the question of whether the integration of separate institutional repositories and increased use of shared services might help to pool resources, reduce costs and increase visibility, citation and impact. While shared repositories are still unusual, in November 2019, the British Library launched its shared open access repository. It brings together the research outputs of six cultural heritage organisations – available as separate repositories as well as a shared search interface at https://iro.bl.uk. To our knowledge, it is the first example of a shared repository that takes advantage of the multi-tenancy features of the open source Samvera Hyku repository system. This paper discusses both the nature, challenge and benefits of developing a multi-tenant repository system, and the BL’s progress towards a shared repository service for a wider range of partner organisations. Based on the lessons learned so far, we will discuss the potential of open source-based, shared repositories to contribute to an open knowledge environment, and how this project already opened up previously closed content.
Specific heat in the integer quantum Hall effect: An exact diagonalization approach
Creators: name: Mandal, Sudhansu S.
name: Acharyya, Muktish
Publisher: name: arXiv
Year: 1997
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have studied the integer quantum Hall effect at finite temperatures by diagonalizing a single body tight binding model Hamiltonian including Aharonov-Bohm phase. We have studied the energy dependence of the specific heat and the Hall conductivity at a given temperature. The specific heat shows a sharp peak between two consecutive Hall plateaus. At very low temperatures, the numerical results of the temperature variations of specific heat (in the plateau region) are in good agreement with the analytical results.
description: 2 figures, (To appear in Physica B)
Image distortion in non perturbative gravitational lensing
Creators: name: Frittelli, Simonetta
name: Kling, Thomas P.
name: Newman, Ezra T.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We introduce the idea of {\it shape parameters} to describe the shape of the pencil of rays connecting an observer with a source lying on his past lightcone. On the basis of these shape parameters, we discuss a setting of image distortion in a generic (exact) spacetime, in the form of three {\it distortion parameters}. The fundamental tool in our discussion is the use of geodesic deviation fields along a null geodesic to study how source shapes are propagated and distorted on the path to an observer. We illustrate this non-perturbative treatment of image distortion in the case of lensing by a Schwarzschild black hole. We conclude by showing that there is a non-perturbative generalization of the use of Fermat's principle in lensing in the thin-lens approximation.
description: 22 pages, 6 figures, to appear in Phys. Rev. D (January 2001)
On the nature of trapped states in an MoS2 two-dimensional semiconductor with sulfur vacancies
Creators: name: Stan, Gabriela Ben-Melech
name: Toroker, Maytal Caspary
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology

description: Molybdenum disulfide (MoS2) is a common two-dimensional semiconductor that has been highly studied as an emerging material for catalysis and electronics. The most common material defects in MoS2 are sulfur vacancies. In order to reveal the nature of the trapped states induced by sulfur vacancies, we perform Density Functional Theory (DFT) combined with quantum dynamics calculations. According to our model, we find that the sulfur vacancies create trap states in the original band gap of monolayer MoS2 that disrupt charge transmission through the monolayer. In addition, we did not find any resonance states among the shallow states in the conduction band continuum.
Machine-Actionable DMPs in the Repository: Motivation and Implementation
Creators: name: Mudd, Taylor
Publisher: name: Zenodo
Year: 2021
Subjects: OR2021
Data Management Plans
DMPs
Machine-Actionable DMPs
Repository
Haplo

description: Data Management Plans (DMPs) are required increasingly to be submitted alongside ethical approval and funding applications for research projects, requiring researchers to consider what data will be produced as part of their research and how that will be managed and stored going forwards. These are typically managed in separate siloed systems, and stored in unstructured formats (eg. PDFs). Recording a DMP in a structured “machine-actionable” format enables systems to report and act on the planning information held within these documents. In this session we will examine how DMPs can be structured in a machine-actionable way, and explore some of the benefits of managing them in the repository alongside dataset deposit and management features. This will include discussion of the challenges in adapting institutional and funder forms to map to a machine-actionable data model, and the use of the RDA Common Standard for machine-actionable DMPs. The implementation of machine-actionable DMPs in Haplo Repository will be used as a case study. We will look at “quick wins” for attendees looking to implement maDMPs in their institutions, as well as consider some of the possible longer term benefits this approach enables.
Chemo-spectrophotometric evolution of spiral galaxies: V. Properties of galactic discs at high redshift
Creators: name: Boissier, S.
name: Prantzos, N.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore the implications for the high redshift universe of ``state-of-the-art'' models for the chemical and spectrophotometric evolution of spiral galaxies. The models are based on simple ``scaling relations'' for discs, obtained in the framework of Cold Dark Matter models for galaxy formation, and were ``calibrated'' as to reproduce the properties of the Milky Way and of nearby discs (at redshift z~0). In this paper, we compare the predictions of our ``hybrid'' approach to galaxy evolution to observations at moderate and high redshift. We find that the models are in fairly good agreement with observations up to z~1, while some problems appear at higher redshift (provided there is no selection bias in the data); these discrepancies may suggest that galaxy mergers (not considered in this work) played a non negligible role at z>1. We also predict the existence of a ``universal'' correlation between abundance gradients and disc scalelengths, independent of redshift.
description: 14 pages, 11 figures, MNRAS, in press
Calculation of Spin Tunneling Effects in the Presence of an Applied Magnetic Field
Creators: name: Liang, J. -Q.
name: Mueller-Kirsten, H. J. W.
name: Shurgaia, A. V.
name: Zimmerschied, F.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Condensed Matter (cond-mat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The tunneling splitting of the energy levels of a ferromagnetic particle in the presence of an applied magnetic field - previously derived only for the ground state with the path integral method - is obtained in a simple way from Schroedinger theory. The origin of the factors entering the result is clearly understood, in particular the effect of the asymmetry of the barriers of the potential. The method should appeal particularly to experimentalists searching for evidence of macroscopic spin tunneling.
description: 10 pages, LaTex, 4 figures included using graphicx
Image distortion from optical scalars in non perturbative gravitational lensing
Creators: name: Frittelli, Simonetta
name: Kling, Thomas P.
name: Newman, Ezra T.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a previous article concerning image distortion in non-perturbative gravitational lensing theory we described how to introduce shape and distortion parameters for small sources. We also showed how they could be expressed in terms of the scalar products of the geodesic deviation vectors of the source's pencil of rays in the past lightcone of an observer. In the present work we give an alternative approach to the description of the shape and distortion parameters and their evolution along the null geodesic from the source to the observer, but now in terms of the optical scalars (the convergence and shear of null vector field of the observer's lightcone) and the associated optical equations, which relate the optical scalars to the curvature of the spacetime.
description: 17 pages, 3 figures, to appear in Phys. Rev. D (January 2001)
A new population of soft X-ray weak quasars
Creators: name: Risaliti, G.
name: Marconi, A.
name: Maiolino, R.
name: Salvati, M.
name: Severgnini, P.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Quasars selected in optical surveys by means of their blue or UV excess are known to be strong emitters in the X-rays, except for Broad Absorption Line (BAL) objects. In this paper we study the X-ray emission of quasars selected through their emission line spectrum rather than their blue excess. X-ray data are obtained by cross-correlating two optical samples (the Hamburg Survey Catalogue and the Palomar Transit Catalogue) with the WGA catalogue of ROSAT observations. We find that a significant fraction of objects are strongly underluminous in the X-rays. We discuss the physical nature of these sources and we propose an interpretation for their optical and X-ray properties based on a dust-poor and gas-rich absorber. Our results suggest the existence of a population of AGNs having a type 1 optical spectrum and a type 2 X-ray emission
description: 8 pages, 8 figures, accepted for publication by Astronomy & Astrophysics
Van der Waals Interactions in DFT using Wannier Functions without empirical parameters
Creators: name: Silvestrelli, Pier Luigi
name: Ambrosetti, Alberto
Publisher: name: arXiv
Year: 2019
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A new implementation is proposed for including van der Waals (vdW) interactions in Density Functional Theory (DFT) using the Maximally-Localized Wannier functions (MLWFs), which is free from empirical parameters. With respect to the previous DFT/vdW-WF2 method, in the present DFT/vdW-WF2-x approach, the empirical, short-range, damping function is replaced by an estimate of the Pauli exchange repulsion, also obtained by the MLWFs properties. Applications to systems contained in the popular S22 molecular database and to the case of an Ar atom interacting with graphite, and comparison with reference data, indicate that the new method, besides being more physically founded, also leads to a systematic improvement in the description of vdW-bonded systems.
description: 3 figures. arXiv admin note: text overlap with arXiv:1111.6737, arXiv:1305.7035, arXiv:1603.08667
Assessment of the GW approximation using Hubbard chains
Creators: name: Pollehn, Thomas J.
name: Schindlmayr, Arno
name: Godby, R. W.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the performance of the GW approximation by comparison to exact results for small model systems. The role of the chemical potentials in Dyson's equation as well as the consequences of numerical resonance broadening are examined, and we show how a proper treatment can improve computational implementations of many-body perturbation theory in general. GW and exchange-only calculations are performed over a wide range of fractional band fillings and correlation strengths. We thus identify the physical situations where these schemes are applicable.
description: 14 pages including 5 figures, LaTeX
Level Correlations in Disordered Metals: the Replica sigma-Model
Creators: name: Kamenev, Alex
name: Mezard, Marc
Publisher: name: arXiv
Year: 1999
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We compute energy level correlations in weakly disordered metallic grains using the fermionic replica method. We use the standard sigma-model approach and show that non--trivial saddle points, which break replica symmetry, must be included in the calculation to reproduce the oscillatory behavior of the correlations. We calculate the correlation functions in all three classical ensembles GOE, GUE and GSE including the finite-dimensional gradient corrections. Our results coincides with those obtained by the supersymmetric sigma-model and the semi-classical trace formula.
description: 15 pages, no figures, added references
Extremely high excitation SiO lines in disk-outflow system in Orion Source I
Creators: name: Kim, Mi Kyoung
name: Hirota, Tomoya
name: Machida, Masahiro N.
name: Matsushita, Yuko
name: Motogi, Kazuhito
name: Matsumoto, Naoko
name: Honma, Mareki
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present high-resolution images of the submillimeter SiO line emissions of a massive young stellar object Orion Source I using the Atacama Large Millimeter/ Submillimeter Array (ALMA) at band 8. We detected the 464 GHz SiO v=4 J=11-10 line in Source I, which is the first detection of the SiO v=4 line in star-forming regions, together with the 465 GHz 29SiO v=2 J=11-10 and the 428 GHz SiO v=2 J=10-9 lines with a resolution of 50 AU. The 29SiO v=2 J=11-10 and SiO v=4 J=11-10 lines have compact structures with the diameter of <80 AU. The spatial and velocity distribution suggest that the line emissions are associated with the base of the outflow and the surface of the edge-on disk. In contrast, SiO v=2 J=10-9 emission shows a bipolar structure in the direction of northeast-southwest low-velocity outflow with ~200 AU scale. The emission line exhibits a velocity gradient along the direction of the disk elongation. With the assumption of the ring structure with Keplerian rotation, we estimated the lower limit of the central mass to be 7 solar mass and the radius of 12 AU< r <26 AU.
description: 13 pages, 4 figures, accepted for publication in ApJ
The BeppoSAX High Energy Large Area Survey. IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources
Creators: name: Vignali, C.
name: Comastri, A.
name: Fiore, F.
name: La Franca, F.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a comprehensive study of the soft X-ray properties of the BeppoSAX High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X-ray selected sources is detected by ROSAT. The soft X-ray colors for many of these objects, along with the 0.5-2 keV flux upper limits for those undetected in the ROSAT band, do imply the presence of absorption. The comparison with the ROSAT Deep Survey sources indicates that a larger fraction of absorbed objects among the HELLAS sources is present, in agreement with their hard X-ray selection and the predictions of the X-ray background synthesis models. Another striking result is the presence of a soft (additional) X-ray component in a significant fraction of absorbed objects.
description: 11 pages, LateX, 6 figures (included), aa.cls, graphicx.sty and lscape.sty macros. Accepted by A&A
Ferromagnetic Mixed-Valence and Kondo-Lattice State in TmTe at High Pressure
Creators: name: Link, P.
name: Goncharenko, I. N.
name: Mignot, J. -M.
name: Matsumura, T.
name: Suzuki, T.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Neutron diffraction experiments on TmTe at pressures up to 7 GPa are reported. The semiconductor-to-metal transition occurring at 2 GPa in this compound is accompanied by the appearance of strong ferromagnetic exchange interactions producing a Curie temperature as high as 14 K. This behavior is characteristic for the incipient mixed-valence regime just above the transition pressure and traced back to the release of a small concentration of free charge carriers in the material. The steep decrease of both the Curie temperature and ordered magnetic moment occurring at higher pressures emphasizes the role of Kondo fluctuations, and raises the interesting possibility that a quantum critical transition to a non-magnetic ground state of mixed-valence Tm might take place around 6 GPa.
description: 4 pages, 2 figures, PDF format; accepted for publication in Physical Review Letters
Instability of Non-vortex State toward a Quantized Vortex in Bose-Einstein Condensate under External Rotation
Creators: name: Isoshima, Tomoya
name: Machida, Kazushige
Publisher: name: arXiv
Year: 1999
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The instability condition of the non-vortex state toward vortex formation is exa mined within the Bogoliubov theory when a Bose-Einstein condensate is under exte rnally forced rotation. The obtained critical angular velocity combined with the previous stability cond itions for a votex yields a detailed phase diagram in the critical velocity vs t he system parameter. This facilitates vortex formation experiments for alkali atom gases confined in a harmonic potential.
description: 4 pages, 4 eps figures. The formulation is the same as that of cond-mat/9811367
Microwave Microscopy for Advanced and Efficient Materials Analysis and Production
Creators: name: Dambrine, Gilles
name: Povolodov, Petr
name: Théron, Didier
name: Haddadi, Kamel
Publisher: name: Zenodo
Year: 2019
Subjects: microwave, imaging, characterization

description: Products which require complicated material systems and nanoscale structural organization, e.g. third-generation solar cells, are often difficult to develop. This is because electronic properties of bulk semiconductors are often masked or at least strongly superimposed by material interface properties. Additionally, these interface properties are complex and thus make product design difficult. MMAMA, an H2020 European project, aims at solving this problem by offering a nanoscale characterization platform for the manufacturers of coatings, photovoltaic cells, and semi-conductor circuits. It is proposed to use a combination of scanning microwave microscopy, free-space, coaxial and dielectric resonator methods, and simulation to measure the material and interface properties of complicated material systems and nano-structures. The presentation give an overview of MMAMA project by presenting partners involved, general objectives, first results achieved and on-going activities.
description: All MMAMA's partners are associated as co-authors of the presentation.
Distant Comet C/2017 K2 and the Cohesion Bottleneck
Creators: name: Jewitt, David
name: Agarwal, Jessica
name: Hui, Man-To
name: Li, Jing
name: Mutchler, Max
name: Weaver, Harold
Publisher: name: arXiv
Year: 2018
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Distant long-period comet C/2017 K2 has been outside the planetary region of the solar system for 3 Myr, negating the possibility that heat retained from the previous perihelion could be responsible for its activity. This inbound comet is also too cold for water ice to sublimate and too cold for amorphous water ice, if present, to crystallize. C/2017 K2 thus presents an ideal target in which to investigate the mechanisms responsible for activity in distant comets. We have used Hubble Space Telescope to study the comet in the pre-perihelion distance range 13.8 to 15.9 AU. The coma maintains a logarithmic surface brightness gradient $m = -1.010\pm$0.004, consistent with steady-state mass loss. The absence of a radiation pressure swept tail indicates that the effective particle size is large (0.1 mm) and the mass loss rate is $\sim$200 kg s$^{-1}$, remarkable for a comet still beyond the orbit of Saturn. Extrapolation of the photometry indicates that activity began in 2012.1, at 25.9$\pm$0.9 AU, where the blackbody temperature is only 55 K. This large distance and low temperature suggest that cometary activity is driven by the sublimation of a super-volatile ice (e.g.~CO), presumably preserved by K2's long-term residence in the Oort cloud. The mass loss rate can be sustained by CO sublimation from an area $\lesssim 2$ km$^2$, if located near the hot sub-solar point on the nucleus. However, while the drag force from sublimated CO is sufficient to lift millimeter sized particles against the gravity of the cometary nucleus, it is 10$^2$ to 10$^3$ times too small to eject these particles against inter-particle cohesion. Our observations thus require either a new understanding of the physics of inter-particle cohesion or the introduction of another mechanism to drive distant cometary mass loss. We suggest thermal fracture and electrostatic supercharging in this context.
description: 27 pages, 9 figures
Two phase transitions in (s+id)-wave Bardeen-Cooper-Schrieffer superconductivity
Creators: name: Ghosh, Angsula
name: Adhikari, Sadhan K.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We establish universal behavior in temperature dependencies of some observables in $(s+id)$-wave BCS superconductivity in the presence of a weak $s$ wave. There also could appear a second second-order phase transition. As temperature is lowered past the usual critical temperature $T_c$, a less ordered superconducting phase is created in $d$ wave, which changes to a more ordered phase in $(s+id)$ wave at $T_{c1}$ ($< T_c$). The presence of two phase transitions manifest in two jumps in specific heat at $T_c$ and $T_{c1}$. The temperature dependencies of susceptibility, penetration depth, and thermal conductivity also confirm the new phase transition.
description: 6 pages, 5 post-script figures.
title: Eine Taxonomie zur Variabilisierung von Programmieraufgaben
Creators: name: Brocker, Annabell
name: Garman, Robert
name: Strickroth, Sven
name: Striewe, Michael
name: Voigtländer, Janis
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2024
Subjects: subject: Programmieraufgaben
subject: Variabilität
subject: Taxonomie
subject: Aufgabendesign

description: Ein wichtiger Faktor für das Erlernen der Programmierung sind praktische Programmieraufgaben. Dabei kann es aus organisatorischen oder didaktischen Gründen hilfreich sein, wenn eine Aufgabe in mehreren, leicht unterschiedlichen Varianten vorliegt. Diese Variabilität von Programmieraufgaben zeigt sich auf verschiedenen Ebenen und erfüllt vielfältige Zwecke. Eine systematische Klassifikation von Aufgabenstellungen auf diesen Ebenen kann dabei helfen, Programmieraufgaben gezielt an unterschiedliche Lernziele und Lernende anzupassen und Systeme zu entwickeln, die Aufgaben automatisch variieren. Der Arbeitskreis E-Assessment der Fachgruppe Bildungstechnologien der Gesellschaft für Informatik e. V. stellte auf dem Workshop einen ersten Entwurf einer Taxonomie vor, die verschiedene Dimensionen der Variabilität wie Schwierigkeitsgrad, Anforderungen, Kontext
und Technologie berücksichtigt. Diese Taxonomie soll Lehrenden, Curriculums-Entwickelnden, Bildungseinrichtungen und Entwickelnden von Bildungstechnologie als Instrument dienen, um Programmieraufgaben gezielt zu variieren bzw. technische Unterstützung für die Variabilität bereitzustellen und somit den unterschiedlichen Bedürfnissen der Lernenden und Zielen der Lehrenden gerecht zu werden. Im Rahmen des halbtägigen Workshops wurde die Taxonomie von den Teilnehmenden erprobt und diskutiert, um Stärken, Schwächen, Erweiterungsmöglichkeiten und Anwendungsgebiete zu identifizieren.
Asymptotic structure of a massless scalar field and its dual two-form field at spatial infinity
Creators: name: Henneaux, Marc
name: Troessaert, Cedric
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Relativistic field theories with a power law decay in $r^{-k}$ at spatial infinity generically possess an infinite number of conserved quantities because of Lorentz invariance. Most of these are not related in any obvious way to symmetry transformations of which they would be the Noether charges. We discuss the issue in the case of a massless scalar field. By going to the dual formulation in terms of a $2$-form (as was done recently in a null infinity analysis), we relate some of the scalar charges to symmetry transformations acting on the $2$-form and on surface degrees of freedom that must be added at spatial infinity. These new degrees of freedom are necessary to get a consistent relativistic description in the dual picture, since boosts would otherwise fail to be canonical transformations. We provide explicit boundary conditions on the $2$-form and its conjugate momentum, which involves parity conditions with a twist, as in the case of electromagnetism and gravity. The symmetry group at spatial infinity is composed of `improper gauge transformations'. It is abelian and infinite-dimensional. We also briefly discuss the realization of the asymptotic symmetries, characterized by a non trivial central extension and point out vacuum degeneracy.
Clinical findings from 104 cases of calving paralysis in dairy cows from Gippsland, Australia
Creators: name: PJ Poulton
name: AD Fisher
name: PD Mansell
name: MF Pyman
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Computational Biology

description: Case History: Dairy cows recumbent following calving on farms in South Gippsland, Australia were examined during two 3-month seasonal calving periods in 2011 and 2012 as part of a larger study of 218 recumbent cows. A cohort of 104 cows diagnosed with calving paralysis following dystocia was derived from the larger group, which were examined with 3 days of becoming recumbent. A thorough medical and musculoskeletal clinical examination was performed on each cow including flexor-withdrawal and patellar reflex tests, and postural assessment in the lifted position, unless the facilities were not available. Cows were diagnosed with one or more neurological syndromes: sciatic, tibial paresis, obturator or femoral, based on clinical findings consistent with damage to these peripheral nerves or their nerve roots. Clinical Findings: Evidence of sciatic syndrome was found in 100/104 (96.2%) cows and 146/172 (84.9%) affected hind limbs either as the sole neuropathy or in combination with tibial paresis, obturator or femoral syndromes. Pelvic damage was also present in 3/104 (2.8%) cows. Obturator syndrome was diagnosed in 30/104 (29%) cows and 45/172 (26.2%) affected hind limbs but not apparently as the sole reason for the recumbency. Femoral syndrome occurred in 16/104 (15.4%) cows and 21/172 (12.2%) affected hind limbs and was the only syndrome recorded in one cow. Clinical Relevance: Sciatic syndrome was the most common neurological syndrome observed in cows with calving paralysis. The other major nerves arising from the lumbo-sacral plexus were also affected and the various syndromes associated with damage to these nerves or their ventral nerve roots occurred in many combinations. Calving paralysis should be thought of as a paresis or paralysis resulting from damage to the ventral nerve roots of the lumbo-sacral plexus as any of the nerves originating from this plexus can be damaged during dystocia either individually or in combination with other nerves from the plexus.
On the Dynamics of the 4d Spin Glass in a magnetic field
Creators: name: Parisi, Giorgio
name: Ricci-Tersenghi, Federico
name: Ruiz-Lorenzo, Juan J.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the four dimensional Gaussian spin glass in presence of a magnetic field. Using off-equilibrium numerical simulations we have found that the probability distribution of the overlaps is built in the same way as that of the Mean Field approximation with replica symmetry breaking. Finally we have studied the violation of the fluctuation-dissipation theorem in presence of magnetic field.
description: 15 pages, 5 figures, uses epsfig.sty. Also available at http://chimera.roma1.infn.it/index_papers_complex.html