cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Glueball-$Q\bar{Q}$ mixing and Okuba-Zweig-Iizuka rule violation in the hadronic decays of heavy quarkonia
Creators: name: Zhao, Qiang
name: Zou, Bing-song
name: Ma, Zhong-biao
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the correlations between the scalar meson configurations and Okuba-Zweig-Iizuka (OZI) rule violations in the hadronic decays of heavy quarkonia, e.g. $J/ψ$ and $Υ$, into isoscalar vector meson ($ϕ$ and $ω$) and scalar mesons ($f_0(1710)$, $f_0(1500)$, and $f_0(1370)$). It shows that the dramatic change of the values of the branching ratio fraction of $ϕf_0/ωf_0$ from low (e.g. in $J/ψ$ decays) to high energies (e.g. in $Υ$ decays) will not only test the glueball-$Q\bar{Q}$ mixings, but also provide important information about the mysterious OZI-rule violations within the scalars.
description: More discussions about the relation between the meson loop and OZI-rule violations are included; Revised version to appear in Phys. Lett. B
Time Evolution of Lepton Number Carried by Majorana Neutrinos
Creators: name: Adam, Apriadi Salim
name: Benoit, Nicholas J.
name: Kawamura, Yuta
name: Matsuo, Yamato
name: Morozumi, Takuya
name: Shimizu, Yusuke
name: Tokunaga, Yuya
name: Toyota, Naoya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We revisit the time evolution of the lepton family number for a SU(2) doublet consisting of a neutrino and a charged lepton. The lepton family number is defined through the weak basis of the SU(2) doublet, where the charged lepton mass matrix is real and diagonal. The lepton family number carried by the neutrino is defined by the left-handed current of the neutrino family. For this work we assume the neutrinos have Majorana mass. This Majorana mass term is switched on at time $t=0$ and the lepton family number is evolved. Since the operator in the flavor eigenstate is continuously connected to that of the mass eigenstate, the creation and annihilation operators for the two eigenstates are related to each other. We compute the time evolution of all lepton family numbers by choosing a specific initial flavor eigenstate for a neutrino. The evolution is studied for relativistic and nonrelativistic neutrinos. The nonrelativistic region is of particular interest for the Cosmic Neutrino Background predicted from big bang models. In that region we find the lepton family numbers are sensitive to Majorana and Dirac phases, the absolute mass, and mass hierarchy of neutrinos.
description: 20 pages, 7 figures. arXiv admin note: text overlap with arXiv:2004.07664. In v3,references are corrected. In v4, Fig.7 is added. In v6,the typos in Eq.(24),(29-33), and (90) are corrected. In v7,Eq.(20) and an author address are corrected
Les indicateurs de vigilance hospitaliers : revue des expériences étrangères
Creators: name: Mentec, Hervé
name: Legris, Candice
name: Cabarrot, Philippe
name: May-Michelangeli, Laetitia
Publisher: name: Health & Co
Year: 2023
Subjects: Indicateur qualité
Restitution des indicateurs
Surveillance
Qualité des soins
Sécurité du patient

description: Le suivi d’indicateurs permet de détecter des résultats atypiques, potentiels reflets de problèmes de qualité ou de sécurité des soins. C’est le principe d’un dispositif de vigilance menant les professionnels à analyser leurs résultats et leurs pratiques en cas de résultat déviant par rapport à la valeur attendue, et à mettre en place des actions d’amélioration en cas d’alerte confirmée. La recherche documentaire internationale réalisée par la Haute Autorité de santé a montré que les indicateurs de vigilance sont utilisés dans plusieurs pays depuis de nombreuses années, sont utilisables en routine à partir des bases de données médico-administratives, doivent, en cas d’alerte, déclencher un processus d’autoévaluation (couplé ou non à d’autres processus extérieurs, comme la revue par les pairs) et doivent être régulièrement réévalués. En France, un tel dispositif de vigilance a été mis en place pour la chirurgie. Ces dispositifs apparaissent vertueux dans les expériences étrangères et doivent trouver leur place en France au côté des autres éléments de la démarche d’amélioration de la qualité et de la sécurité des soins.
Positive definite maps, representations and frames
Creators: name: Dutkay, Dorin Ervin
Publisher: name: arXiv
Year: 2005
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We present a unitary approach to the construction of representations and intertwining operators. We apply it to the $C^*$-algebras, groups, Gabor type unitary systems and wavelets. We give an application of our method to the theory of frames, and we prove a general dilation theorem which is in turn applied to specific cases, and we obtain in this way a dilation theorem for wavelets.
Lyngbya majuscula Blooms in an Enclosed Marine Environment
Creators: name: Ng, Chin Soon Lionel
name: Ong, Lin Jin
name: Loke Ming Chou
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2012
Subjects: Lyngbya majuscula,sediment resuspension,enclosed marine environment,Singapore

description: 2, 5, EnvironmentAsia
Model for a Macroscopically Disordered Conductor with an Exactly Linear High-Field Magnetoresistance
Creators: name: Guttal, Vishwesha
name: Stroud, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We calculate the effective resistivity of a macroscopically disordered two dimensional conductor consisting of two components in a perpendicular magnetic field. When two components have equal area fractions, we use a duality theorem to show that the magnetoresistance is non-saturating and at high fields varies exactly linearly with magnetic field. At other compositions, an effective medium calculation leads to a saturating magnetoresistance. We briefly discuss possible connections between these results and magnetoresistance measurements on heavily disordered chalconide semiconductors.
description: 4 EPS figures, REVTEX style; Typos and Figures 1 and 2 corrected
Critical Factors Affecting the Desertification in Pa Deng, Adjoining Area of Kaeng Krachan National Park, Thailand
Creators: name: Saowanee Wijitkosum
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2014
Subjects: critical factor,desertification,soil erosion,land use,climate change

description: 2, 7, EnvironmentAsia
Andoa Field Materials
Creators: name: Arahuanaza, Dionisia
name: Arahuanaza, Lidia
name: Mucushua, Juan
name: Sandi, María
name: Beier, Christine
name: Escamilla, Ramón
name: Michael, Lev
name: Peeke, Catherine
name: Piqueras-Brunet, Marta
name: Sargent, Mary
name: Mucushúa, Pedro
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021

description: Audio recordings of lexical and sentence elicitation, scanned fieldnotes, derivative materials, previous documentation and analysis, photographs.
Non-universal suppression of the excitation gap in chaotic Andreev billiards: Superconducting terminals as sensitive probes for scarred states
Creators: name: Kormanyos, Andor
name: Schomerus, Henning
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: When a quantum-chaotic normal conductor is coupled to a superconductor, random-matrix theory predicts that a gap opens up in the excitation spectrum which is of universal size $E_g^{\rm RMT}\approx 0.3 \hbar/t_D$, where $t_D$ is the mean scattering time between Andreev reflections. We show that a scarred state of long lifetime $t_S\gg t_D$ suppresses the excitation gap over a window $ΔE\approx 2 E_g^{\rm RMT}$ which can be much larger than the narrow resonance width $Γ_S=\hbar/t_S$ of the scar in the normal system. The minimal value of the excitation gap within this window is given by $Γ_S/2\ll E_g^{\rm RMT}$. Hence the scarred state can be detected over a much larger energy range than it is the case when the superconducting terminal is replaced by a normal one.
description: 4 pages, 4 figures
An exploratory, descriptive study of art museum educators' attitudes in regard to art museum-elementary school collaboration
Creators: name: Liu, Wan-Chen
Publisher: name: University of British Columbia
Year: 2009

description: In North America, art museums have rendered services to elementary schools since the early 1900s. Although the scope and number of these services have expanded in the past several decades, the nature of the art museum-elementary school collaborative relationship can be problematic, and even counterproductive to the enhancement of quality of art education. There are some crucial issues related to the nature of and factors underlying collaboration among elementary schools and art museums, that need to be carefully considered in order for these efforts to be successful and fruitful. Since the relationship between attitudes and behavior is reciprocal, the attitudes of art museum educators in regard to art museum-elementary school collaboration are crucial to the quality and effectiveness of any collaborative endeavors and directly impact art museums' contribution to elementary art education. Therefore, this study explores art museum educators' attitudes in regard to art museum-elementary school collaboration. The present investigation is the only study of its kind in Canada to date. From the fall of 1997 to the spring of 1998, I conducted a survey of art museum educators in the province of British Columbia, Canada as well as interviews involving nine informants working in two art museums. Moreover, in order to meaningfully interpret the interview data, I observed the informants' daily routines in these galleries and collected documents related to the two study sites. This mixed method design was used to study BC art museum educators' attitudes in regard to art museum-elementary school collaboration relative to six specific issues: 1) models of art museum/gallery-school collaboration; 2) pedagogy and methods of art museum/gallery programs for elementary schools; 3) art museum/gallery programs and resources for elementary school teachers; 4) elementary school teacher participation in school-oriented art museum education; 5) content of art museum/gallery programs for elementary schools; and 6) linkage of art museum/gallery school programs and elementary school curricula. The results of this study suggest important implications to the future of collaborative endeavors bringing together elementary schools and art museums by highlighting issues related to the dynamics of the art museum educator - elementary school teacher relationships, professional knowledge and expertise, and curriculum links that strongly impact on such partnerships. They also provide guidance for future related research.
Article Series: "Common Grounds"  (COESO D.7.4)
Creators: name: Goyer, Gabrielle
name: Ariès, Quentin
name: Yildirim, Kaan
name: Achenbach, Kelly
Publisher: name: Zenodo
Year: 2023
Subjects: COESO Project
Participatory Research
Citizen Science

description: This report provides an overview of the "Common Grounds" article series, a component of the Collaborative Engagement on Societal Issues (COESO) project's communication and dissemination efforts. Serving as a key deliverable within the project's work package on communication and dissemination (WP7), the document introduces the article series, highlighting its creation and publication on the Cafebabel onlie magazine. The article series, showcased on Cafebabel, serves as a medium to communicate about participatory research to the larger public, with each article providing unique insights into the diverse COESO pilot projects.
Kähler-Einstein metrics on smooth Fano symmetric varieties with Picard number one
Creators: name: Lee, Jae-Hyouk
name: Park, Kyeong-Dong
name: Yoo, Sungmin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14M27, 32Q20, 53C25

description: Symmetric varieties are normal equivarient open embeddings of symmetric homogeneous spaces, and they are interesting examples of spherical varieties. We prove that all smooth Fano symmetric varieties with Picard number one admit Kähler-Einstein metrics by using a combinatorial criterion for K-stability of Fano spherical varieties obtained by Delcroix. For this purpose, we present their algebraic moment polytopes and compute the barycenter of each moment polytope with respect to the Duistermaat-Heckman measure.
description: 13 pages, 6 figures
MEASURING GLOBAL SPIN ALIGNMENT OF VECTOR MESONS AT STAR
Creators: name: III, Charles William Robertson
Publisher: name: Purdue University Graduate School
Year: 2025
Subjects: classificationCode: 510601
subject: Nuclear physics

description: Analysis of the global spin alignment of phi mesons in relativistic heavy-ion collisions at STAR. New methods for raw spin alignment signal and detector effect correctionsThis analysis prompted an erratum for: STAR Collaboration. Pattern of global spin alignment of ϕ and K*0 mesons in heavy-ion collisions. Nature 614, 244–248 (2023)
Geometry and Topology of Coadjoint Orbits of Semisimple Lie Groups
Creators: name: Bernatska, Julia
name: Holod, Petro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Representation Theory (math.RT)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 22E27, 57T15

description: Orbits of coadjoint representations of classical compact Lie groups have a lot of applications. They appear in representation theory, geometrical quantization, theory of magnetism, quantum optics etc. As geometric objects the orbits were the subject of much study. However, they remain hard for calculation and application. We propose simple solutions for the following problems: an explicit parameterization of the orbit by means of a generalized stereographic projection, obtaining a Kählerian structure on the orbit, introducing basis two-forms for the cohomology group of the orbit.
description: 21 pages, 1 figure, submitted to Proceedings of the 9th International Conference on 'Geometry, Integrability and Quantization', Varna, Bulgaria, June 8-13, 2007
Upper limits on gravitational wave bursts in LIGO's second science run
Creators: name: LIGO Scientific Collaboration
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We perform a search for gravitational wave bursts using data from the second science run of the LIGO detectors, using a method based on a wavelet time-frequency decomposition. This search is sensitive to bursts of duration much less than a second and with frequency content in the 100-1100Hz range. It features significant improvements in the instrument sensitivity and in the analysis pipeline with respect to the burst search previously reported by LIGO. Improvements in the search method allow exploring weaker signals, relative to the detector noise floor, while maintaining a low false alarm rate, O(0.1) microHz. The sensitivity in terms of the root-sum-square (rss) strain amplitude lies in the range of hrss~10^{-20} - 10^{-19}/sqrt(Hz) No gravitational wave signals were detected in 9.98 days of analyzed data. We interpret the search result in terms of a frequentist upper limit on the rate of detectable gravitational wave bursts at the level of 0.26 events per day at 90% confidence level. We combine this limit with measurements of the detection efficiency for given waveform morphologies in order to yield rate versus strength exclusion curves as well as to establish order-of-magnitude distance sensitivity to certain modeled astrophysical sources. Both the rate upper limit and its applicability to signal strengths improve our previously reported limits and reflect the most sensitive broad-band search for untriggered and unmodeled gravitational wave bursts to date.
description: 23 pages, 14 figures, to be submitted to Phys Rev D
On the motion of a compact elastic body
Creators: name: Beig, Robert
name: Wernig-Pichler, Michael
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the problem of motion of a relativistic, ideal elastic solid with free surface boundary by casting the equations in material form ("Lagrangian coordinates"). By applying a basic theorem due to Koch, we prove short-time existence and uniqueness for solutions close to a trivial solution. This trivial, or natural, solution corresponds to a stress-free body in rigid motion.
description: 12 pages, with slight corrections, to be published in Commun.Math.Phys
Bar-Halo Friction in Galaxies II: Metastability
Creators: name: Sellwood, J. A.
name: Debattista, Victor P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is well-established that strong bars rotating in dense halos generally slow down as they lose angular momentum to the halo through dynamical friction. Angular momentum exchanges between the bar and halo particles take place at resonances. While some particles gain and others lose, friction arises when there is an excess of gainers over losers. This imbalance results from the generally decreasing numbers of particles with increasing angular momentum, and friction can therefore be avoided if there is no gradient in the density of particles across the major resonances. Here we show that anomalously weak friction can occur for this reason if the pattern speed of the bar fluctuates upwards. After such an event, the density of resonant halo particles has a local inflexion created by the earlier exchanges, and bar slowdown can be delayed for a long period; we describe this as a metastable state. We show that this behavior in purely collisionless N-body simulations is far more likely to occur in methods with adaptive resolution. We also show that the phenomenon could arise in nature, since bar-driven gas inflow could easily raise the bar pattern speed enough to reach the metastable state. Finally, we demonstrate that mild external, or internal, perturbations quickly restore the usual frictional drag, and it is unlikely therefore that a strong bar in a galaxy having a dense halo could rotate for a long period without friction.
description: 13 pages, 11 figures, to appear in ApJ
Entanglement entropy and entanglement witnesses in models of strongly interacting low-dimensional fermions
Creators: name: França, V. V.
name: Capelle, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate the entanglement entropy of strongly correlated low-dimensional fermions in metallic, superfluid and antiferromagnetic insulating phases. The entanglement entropy reflects the degrees of freedom available in each phase for storing and processing information, but is found not to be a state function in the thermodynamic sense. The role of critical points, smooth crossovers and Hilbert space restrictions in shaping the dependence of the entanglement entropy on the system parameters is illustrated for metallic, insulating and superfluid systems. The dependence of the spin susceptibility on entanglement in antiferromagnetic insulators is obtained quantitatively. The opening of spin gaps in antiferromagnetic insulators is associated with enhanced entanglement near quantum critical points.
description: 5 pages, 5 figures, accepted by PRA
The Cosmology of Massless String Modes
Creators: name: Patil, Subodh P.
name: Brandenberger, Robert H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the spacetime dynamics of a gas of closed strings in the context of General Relativity in a background of arbitrary spatial dimensions. Our motivation is primarily late time String Gas Cosmology, where such a spacetime picture has to emerge after the dilaton has stabilized. We find that after accounting for the thermodynamics of a gas of strings, only string modes which are massless at the self-dual radius are relevant, and that they lead to a dynamics which is qualitatively different from that induced by the modes usually considered in the literature. In the context of an ansatz with three large spatial dimensions and an arbitrary number of small extra dimensions, we obtain isotropic stabilization of these extra dimensions at the self-dual radius. This stabilization occurs for fixed dilaton, and is induced by the special string states we focus on. The three large dimensions undergo a regular Friedmann-Robertson-Walker expansion. We also show that this framework for late-time cosmology is consistent with observational bounds.
description: 15 pages, no figures, references added (again)
Anti-de Sitter curvature radius constrained by quasars in brane-world scenarios
Creators: name: Coimbra-Araujo, Carlos H.
name: da Rocha, Roldao
name: Pedron, I. T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper is intended to investigate the luminosity due to accretion of gas in supermassive black holes (SMBHs) in the center of quasars, using a brane-world scenario naturally endowed with extra dimensions, whereon theories formulated introduce corrections in the field equations at high energies. SMBHs possess the necessary highly energetic environment for the introduction of these corrections, which are shown to produce small deviations in all SMBH properties and, consequentely, corrections in the accretion theory that supports quasars radiative processes. The radiative flux observed from quasars indicates these deviations, from which the magnitude of the AdS$_5$ bulk curvature radius, and consequently the extra dimension compactification radius is estimated.
description: 11 pages, RevTeX, Eq.(2) and (3) expanded, and comments thereon updated
SINFONI in the Galactic Center: young stars and IR flares in the central light month
Creators: name: Eisenhauer, F.
name: Genzel, R.
name: Alexander, T.
name: Abuter, R.
name: Paumard, T.
name: Ott, T.
name: Gilbert, A.
name: Gillessen, S.
name: Horrobin, M.
name: Trippe, S.
name: Bonnet, H.
name: Dumas, C.
name: Hubin, N.
name: Kaufer, A.
name: Kissler-Patig, M.
name: Monnet, G.
name: Stroebele, S.
name: Szeifert, T.
name: Eckart, A.
name: Schoedel, R.
name: Zucker, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report 75 milli-arcsec resolution, near-IR imaging spectroscopy within the central 30 light days of the Galactic Center [...]. To a limiting magnitude of K~16, 9 of 10 stars in the central 0.4 arcsec, and 13 of 17 stars out to 0.7 arcsec from the central black hole have spectral properties of B0-B9, main sequence stars. [...] all brighter early type stars have normal rotation velocities, similar to solar neighborhood stars. We [...] derive improved 3d stellar orbits for six of these S-stars in the central 0.5 arcsec. Their orientations in space appear random. Their orbital planes are not co-aligned with those of the two disks of massive young stars 1-10 arcsec from SgrA*. We can thus exclude [...] that the S-stars as a group inhabit the inner regions of these disks. They also cannot have been located/formed in these disks [...]. [...] we conclude that the S-stars were most likely brought into the central light month by strong individual scattering events. The updated estimate of distance to the Galactic center from the S2 orbit fit is Ro = 7.62 +/- 0.32 kpc, resulting in a central mass value of 3.61 +/- 0.32 x 10^6 Msun. We happened to catch two smaller flaring events from SgrA* [...]. The 1.7-2.45 mum spectral energy distributions of these flares are fit by a featureless, red power law [...]. The observed spectral slope is in good agreement with synchrotron models in which the infrared emission comes from [...] radiative inefficient accretion flow in the central R~10 Rs region.
description: 50 pages, 10 figures, 2 tables, submitted to ApJ, February 6th, 2005, abstract abridged
The relativistic dynamics of oppositely charged two fermions interacting with external uniform magnetic field
Creators: name: Guvendi, Abdullah
name: Dogan, Semra Gurtas
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We investigated the relativistic dynamics of oppositely charged two fermions interacting with an external uniform magnetic field. We chose the interaction of each fermion with the external magnetic field in the symmetric gauge, and obtained a precise solution of the corresponding fully-covariant two-body Dirac equation that derived from Quantum Electrodynamics via Action principle. The dynamic symmetry of the system we deal with allowed us to determine the relativistic Landau levels of such a spinless composite system, without using any group theoretical method. As a result, we determined the eigenfunctions and eigenvalues of the corresponding two-body Dirac Hamiltonian
description: 1 figure
Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum
Creators: name: Alberola, N.
name: Anthonioz, T.
name: Badertscher, A.
name: Bas, C.
name: Belov, A. S.
name: Crivelli, P.
name: Gninenko, S. N.
name: Golubev, N. A.
name: Kirsanov, M. M.
name: Rubbia, A.
name: Sillou, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We have developed a high-efficiency pulsed slow positron beam for experiments with orthopositronium in vacuum. The new pulsing scheme is based on a double-gap coaxial buncher powered by an RF pulse of appropriate shape. The modulation of the positron velocity in the two gaps is used to adjust their time-of-flight to a target. This pulsing scheme allows to minimize non-linear aberrations in the bunching process and to efficiently compress positron pulses with an initial pulse duration ranging from 300 to 50 ns into bunches of 2.3 to 0.4 ns width, respectively, with a repetition period of 1 mks. The compression ratio achieved is ~100, which is a factor 5 better than has been previously obtained with slow positron beams based on a single buncher. Requirements on the degree, to which the moderated positrons should be mono-energetic and on the precision of the waveform generation are presented. Possible applications of the new pulsed positron beam for measurements of thin films are discussed.
description: 16 pages, 11 figures
Residual oxygen content and powder recycling: effects on microstructure and mechanical properties of additively manufactured Ti-6Al-4V parts
Creators: name: Emminghaus, Nicole
name: Bernhard, Robert
name: Hermsdorf, Jörg
name: Kaierle, Stefan
Publisher: name: London : Springer
Year: 2022
Subjects: subject: Additive manufacturing
subject: Design of experiments
subject: Laser-based powder bed fusion
subject: Mechanical properties
subject: Microstructure
subject: Ti-6Al-4V
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: The laser-based powder bed fusion of metals (PBF-LB/M) offers a variety of advantages over conventional processing techniques and the possibility to recycle and reuse powder increases its sustainability. However, the process and resulting part properties are influenced by a variety of factors including powder recycling grade and residual oxygen content of the process atmosphere. Especially in terms of reactive materials like Ti-6Al-4V, oxidation during processing and recycling determines process stability and reproducibility. This work therefore focusses on the influence of the conventionally varied processing parameters as well as atmosphere residual oxygen content process and powder recycling on the microstructure and mechanical properties. For this purpose, the design of experiments approach is used and by evaluation of regression models, effect sizes and interactions are given. Additionally, two different etching techniques were employed to reveal different aspects of the microstructure. While no significant influence of powder recycling and residual oxygen on the microstructure could be observed, they both significantly influence the mechanical properties. A maximum hardness of 470 HV0.1, a maximum ultimate tensile strength of 1252.3 MPa, and a maximum elongation at break of 17.8 % were obtained. The results demonstrate the importance of the processing atmosphere’s residual oxygen content and of taking into account the changing powder characteristics during recycling as well as its effect on the part properties.
Live and Dead Nodes
Creators: name: Lehmann, S.
name: Jackson, A. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper, we explore the consequences of a distinction between `live' and `dead' network nodes; `live' nodes are able to acquire new links whereas `dead' nodes are static. We develop an analytically soluble growing network model incorporating this distinction and show that it can provide a quantitative description of the empirical network composed of citations and references (in- and out-links) between papers (nodes) in the SPIRES database of scientific papers in high energy physics. We also demonstrate that the death mechanism alone can result in power law degree distributions for the resulting network.
description: 12 pages, 3 figures. To be published in Computational and Mathematical Organization Theory
PolyVent V2.0 Organisation Repo, having documentation and reference to module repos
Creators: name: Read, Robert
name: Bechard, Nathaniel
name: Suturin, Victor
name: Zuiderwijk, Antal
Publisher: name: Zenodo
Year: 2024
Subjects: ventilator
Arudiuno
open source
respiration
patient-ventilator asynchrony
acoustic ventilation
ventilation modes

description: This is the Organisation Repo for the PolyVent V2.0. The PolyVent is a fully open-source mechanical ventilator. This is a top-level repo that contains documentation and references to the individual module repositories.

PolyVent is highly modular; different modules designs are in different repos. Although this harms understanding, it helps engineering flexibility.
Trading Transforms of Non-weighted Simple Games and Integer Weights of Weighted Simple Games
Creators: name: Kawana, Akihiro
name: Matsui, Tomomi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: 91B12

description: This study investigates simple games. A fundamental research question in this field is to determine necessary and sufficient conditions for a simple game to be a weighted majority game. Taylor and Zwicker (1992) showed that a simple game is non-weighted if and only if there exists a trading transform of finite size. They also provided an upper bound on the size of such a trading transform, if it exists. Gvozdeva and Slinko (2011) improved that upper bound; their proof employed a property of linear inequalities demonstrated by Muroga (1971).In this study, we provide a new proof of the existence of a trading transform when a given simple game is non-weighted. Our proof employs Farkas' lemma (1894), and yields an improved upper bound on the size of a trading transform. We also discuss an integer-weight representation of a weighted simple game, improving the bounds obtained by Muroga (1971). We show that our bound on the quota is tight when the number of players is less than or equal to five, based on the computational results obtained by Kurz (2012). Furthermore, we discuss the problem of finding an integer-weight representation under the assumption that we have minimal winning coalitions and maximal losing coalitions.In particular, we show a performance of a rounding method. Lastly, we address roughly weighted simple games. Gvozdeva and Slinko (2011) showed that a given simple game is not roughly weighted if and only if there exists a potent certificate of non-weightedness. We give an upper bound on the length of a potent certificate of non-weightedness. We also discuss an integer-weight representation of a roughly weighted simple game.
description: 23 pages
The social sciences and humanities contributions to citizen science: insights from the COESO project journey (COESO D.7.6)
Creators: name: Smaniotto, Alessia
Publisher: name: Zenodo
Year: 2023
Subjects: COESO Project
Social Sciences and Humanities
SSH
Citizen Science
Participatory Research

description: This document is a summary report from the COESO project work, taking stock of desk research, field learnings and community feedback collected during its preparation (2018–2020) and its implementation (January 2021-December 2023) phases. The COESO project was coordinated by a research performing organization focused on social sciences and humanities (SSH) research – the French École des Hautes Études en Sciences Sociales – and a French research infrastructure committed to fostering scholarly communication and open science in the SSH – OpenEdition. The main outcome of the project – the Virtual Ecosystem for Research Activation (VERA) – is now part of the portfolio of services of the European research infrastructure OPERAS.
Weltweite Beziehungen einer deutschen Landeskirche am Beispiel der Evangelischen Kirche von Westfalen
Creators: name: Thimme, Hans-Martin
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 37 Nr. 4 (1988): Ökumenische Rundschau, Band 37, Heft 4
Water maser variability in a high-mass YSO outburst -- VERA and ALMA observations of S255 NIRS 3
Creators: name: Hirota, Tomoya
name: Cesaroni, Riccardo
name: Moscadelli, Luca
name: Sugiyama, Koichiro
name: Burns, Ross A.
name: Kim, Jungha
name: Sunada, Kazuyoshi
name: Yonekura, Yoshinori
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We carried out observations of the 22 GHz H2O masers in a high-mass protostar S255 NIRS 3 by using VERA. We measured the proper motions of the 22 GHz H2O masers associated with a bipolar outflow. The expansion velocity of the blueshifted bow shock traced by the 22 GHz H2O masers was 28 km s-1 corresponding to a dynamical timescale of 60 years. The direction of the maser outflow is slightly tilted compared with the radio jet, which could suggest a more recent ejection episode during the accretion burst event. The total flux density of the 22 GHz H2O masers has gradually increased from early 2017 and has become almost constant in 2018. For the first time, we reveal extended H2O maser emission at 22 GHz in a star forming region, which is partly resolved out by VERA and even by the most extended VLA configurations. We find that the flux variation of such an extended component is similar to that of the unresolved maser emission. We also conducted observations of the submillimeter continuum and the 321 GHz H2O masers with ALMA at Band 7. The continuum emission does not show significant variations compared with the previous observations performed 5 months before. We mapped the 321 GHz H2O masers in S255 NIRS 3 providing the fourth example, for this maser, of the spatial distribution in a high-mass star-forming region. The lower ratio of the 22 GHz/321 GHz maser luminosity in the blueshifted bow shock suggests a temperature (>1000 K), higher than for the other maser features in this region. We conclude that the bow shock structure traced by the 22 GHz H2O maser features is unlikely to be originating at the interface between the radio jet powered by the recent accretion outburst and the surrounding medium. The brightening of the 22 GHz H2O masers could be due to radiative excitation by photons form the infrared outburst escaping along the cavity created by the newly ejected material.
description: 19 pages, 28 figures, accepted for publication in Astronomy & Astrophysics
The ages of L dwarfs
Creators: name: Jameson, R. F.
name: Lodieu, N.
name: Casewell, S. L.
name: Bannister, N. P.
name: Dobbie, P. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new method to derive the age of young (<0.7 Gyr) L dwarfs based on their near-infrared photometry, colours, and distances. The method is based on samples of L dwarfs belonging to the Upper Sco association (5 Myr), the Alpha Per (85 Myr) and Pleiades (125 Myr) clusters, and the Ursa Major (400 Myr) and Hyades (625 Myr) moving groups. We apply our method to a number of interesting objects in the literature, including a known L dwarf binary, L dwarf companions, and spectroscopic members of the young sigma Orionis cluster.
description: 8 pages, 5 figures. Accepted for publication in MNRAS
How Medical Crowdfunding Helps People? A Large-scale Case Study on Waterdrop Fundraising
Creators: name: Huang, Junjie
name: Shen, Huawei
name: Cao, Qi
name: Cai, Li
name: Cheng, Xueqi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: While online medical crowdfunding achieved tremendous success, quantitative study about whether and how medical crowdfunding helps people remains little explored. In this paper, we empirically study how online medical crowdfunding helps people using more than 27, 000 fundraising cases in Waterdrop Fundraising, one of the most popular online medical crowdfunding platforms in China. We find that the amount of money obtained by fundraisers is broadly distributed, i.e., a majority of lowly donated cases coexist with a handful of very successful cases. We further investigate the factors that potentially correlate with the success of medical fundraising cases. Profile information of fundraising cases, e.g., geographic information of fundraisers, affects the donated amounts, since detailed description may increase the credibility of a fundraising case. One prominent finding lies in the effect of social network on the success of fundraising cases: the spread of fundraising information along social network is a key factor of fundraising success, and the social capital of fundraisers play an important role in fundraising. Finally, we conduct prediction of donations using machine learning models, verifying the effect of potential factors to the success of medical crowdfunding. Altogether, this work presents a data-driven view of medical fundraising on the web and opens a door to understanding medical crowdfunding.
description: Accepted as a full paper at ICWSM 2021
Photoinduced absorption in disubstituted polyacetylenes: Comparison of theory with experiments
Creators: name: Sony, Priya
name: Shukla, Alok
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In a recently performed experiment Korovyanko et al [Phys. Rev. B 67, 035114 (2003)] have measured the photo-induced absorption (PA) spectrum of phenyl-disubstituted polyacetylenes (PDPA) from 1$B_{u}$ and 2$A_{g}$ excited states. In 1$B_{u}$ PA spectrum they identified two main features namely PA1 and PA2. While in the 2$A_{g}$ spectrum they identified only one feature called PA$_{g}$. In this paper we present a theoretical study of 1$B_{u}$ and 2$A_{g}$ PA spectra of oligo-PDPA's using correlated-electron Pariser-Parr-Pople (P-P-P) model and various configuration interaction (CI) methodologies. We compare the calculated spectra with the experiments, as well as with the calculated spectra of polyenes of the same conjugation lengths. Calculated spectra are in good agreement with the experiments. Based upon our calculations, we identify PA1 as the m$A_{g}$ state and PA$_{g}$ as the $nB_{u}$ state of the polymer. Regarding the PA2 feature, we present our speculations. Additionally, it is argued that the nature of excited states contributing to the $2A_{g}$-PA spectra of oligo-PDPA's is qualitatively different from those contributing to the spectra of polyenes.
description: Revtex4, 14 pages, 8 figures (To appear in Phys. Rev. B, March 15 (2005) issue)
Son of two tribes : a research journey
Creators: name: Yorke, Daun C.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis consists of two parts. The first is a children's book titled "Son Of Two Tribes". The second part is this document which traces the two and a half year research journey taken by the author and subject in writing this book. This work is a marriage of images and text. "Son Of Two Tribes" and the accompanying research journey focus on the cultural heritage of one small child, Luther Tettevi. Luther is a member of two tribes, the Dakelh' ne First Nations in Northern British Columbia and the Anlo Ewe in Southern Ghana. The book and journey explore the untouched heritages of both tribes, when Luther's ancestors on both continents were living in harmony with nature. The European invasion of each tribal homeland is uncovered and issues such as slavery, residential schools and the Sixties' Scoop are explored as they directly impacted this child's family history. Images of First Nations and African people portrayed in the media are discussed and exposed visually. This work concludes with a discussion about the process of rebuilding, after a troubled past and the strength within this family to endure and survive.
Quartic hilltop inflation revisited
Creators: name: German, Gabriel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We implement a procedure by which the parameters present in the potential of Quartic Hilltop Inflation (QHI) are eliminated in favor of the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$. By doing this it is posible to obtain in a straightforward and simple way the equations of a previous analysis where an analytical treatment of QHI in the large field limit is given. This procedure also allows a more precise discussion of general properties of the model. Also, using a constraint from the reheating epoch it is possible to find bounds for the parameters of the model as well as for quantities of interest such as the running of the scalar index, the reheating temperature and the inflationary scale. Since the bounds found come from expressions given exclusively in terms of $n_s$ and $r$ they will continue to narrow as the measurements of the observables $n_s$ and $r$ become more sensitive.
description: 14 pages, 5 figures. Accepted for publication in JCAP. Small changes to match the accepted version
Pattern-matching Unit for Medical Applications
Creators: name: Leombruni, O.
name: Annovi, A.
name: Giannetti, P.
name: Biesuz, N. V.
name: Roda, C.
name: Piendibene, M.
name: Calvetti, M.
name: Peretti, L.
name: Cencini, M.
name: Tosetti, M.
name: Buonincontri, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Medical Physics (physics.med-ph)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We explore the application of concepts developed in High Energy Physics (HEP) for advanced medical data analysis. Our study case is a problem with high social impact: clinically-feasible Magnetic Resonance Fingerprinting (MRF). MRF is a new, quantitative, imaging technique that replaces multiple qualitative Magnetic Resonance Imaging (MRI) exams with a single, reproducible measurement for increased sensitivity and efficiency. A fast acquisition is followed by a pattern matching (PM) task, where signal responses are matched to entries from a dictionary of simulated, physically-feasible responses, yielding multiple tissue parameters simultaneously. Each pixel signal response in the volume is compared through scalar products with all dictionary entries to choose the best measurement reproduction. MRF is limited by the PM processing time, which scales exponentially with the dictionary dimensionality, i.e. with the number of tissue parameters to be reconstructed. We developed for HEP a powerful, compact, embedded system, optimized for extremely fast PM. This system executes real-time tracking for online event selection in the HEP experiments, exploiting maximum parallelism and pipelining. Track reconstruction is executed in two steps. The Associative Memory (AM) ASIC first implements a PM algorithm by recognizing track candidates at low resolution. The second step, which is implemented into FPGAs (Field Programmable Gate Arrays), refines the AM output finding the track parameters at full resolution. We propose to use this system to perform MRF, to achieve clinically reasonable reconstruction time. This paper proposes an adaptation of the HEP system for medical imaging and shows some preliminary results.
description: 6 pages, 6 figures, submitted to the 22nd IEEE Real Time Conference
Optimization approach for the computation of magnetohydrostatic coronal equilibria in spherical geometry
Creators: name: Wiegelmann, T.
name: Neukirch, T.
name: Ruan, P.
name: Inhester, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: This paper presents a method which can be used to calculate models of the global solar corona from observational data. Aims: We present an optimization method for computing nonlinear magnetohydrostatic equilibria in spherical geometry with the aim to obtain self-consistent solutions for the coronal magnetic field, the coronal plasma density and plasma pressure using observational data as input. Methods: Our code for the self-consistent computation of the coronal magnetic fields and the coronal plasma solves the non-force-free magnetohydrostatic equilibria using an optimization method. Previous versions of the code have been used to compute non-linear force-free coronal magnetic fields from photospheric measurements in Cartesian and spherical geometry, and magnetostatic-equilibria in Cartesian geometry. We test our code with the help of a known analytic 3D equilibrium solution of the magnetohydrostatic equations. The detailed comparison between the numerical calculations and the exact equilibrium solutions is made by using magnetic field line plots, plots of density and pressure and some of the usual quantitative numerical comparison measures. Results: We find that the method reconstructs the equilibrium accurately, with residual forces of the order of the discretisation error of the analytic solution. The correlation with the reference solution is better than 99.9% and the magnetic energy is computed accurately with an error of <0.1%. Conclusions: We applied the method so far to an analytic test case. We are planning to use this method with real observational data as input as soon as possible.
description: 6 pages, 4 figures