cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Plasma vs Drude modelling of the Casimir force: beyond the proximity force approximation
Creators: name: Hartmann, Michael
name: Ingold, Gert-Ludwig
name: Neto, Paulo A. Maia
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We calculate the Casimir force and its gradient between a spherical and a planar gold surface. Significant numerical improvements allow us to extend the range of accessible parameters into the experimental regime. We compare our numerically exact results with those obtained within the proximity force approximation (PFA) employed in the analysis of all Casimir force experiments reported in the literature so far. Special attention is paid to the difference between the Drude model and the dissipationless plasma model at zero frequency. It is found that the correction to PFA is too small to explain the discrepancy between the experimental data and the PFA result based on the Drude model. However, it turns out that for the plasma model, the corrections to PFA lie well outside the experimental bound obtained by probing the variation of the force gradient with the sphere radius [D. E. Krause et al., Phys. Rev. Lett. 98, 050403 (2007)]. The corresponding corrections based on the Drude model are significantly smaller but still in violation of the experimental bound for small distances between plane and sphere.
description: 6 pages, 3 figures; final version accepted for publication in PRL
Fluctuations of the gluon distribution from the small-x effective action
Creators: name: Dumitru, Adrian
name: Skokov, Vladimir
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The computation of observables in high energy QCD involves an average over stochastic semiclassical small-x gluon fields. The weight of various configurations is determined by the effective action. We introduce a method to study fluctuations of observables, functionals of the small-x fields, which does not explicitly involve dipoles. We integrate out those fluctuations of the gluon field under which a given observable is invariant. Thereby we obtain the effective potential for that observable describing its fluctuations about the saddle point. We determine explicitly the effective potential for the covariant gauge gluon distribution both for the McLerran-Venugopalan (MV) model and for a (non-local) Gaussian approximation for the small-x effective action. This provides insight into the correlation of fluctuations of the number of hard gluons versus their typical transverse momentum. We find that the spectral shape of the fluctuations of the gluon distribution is fundamentally different in the MV model, where there is a pile-up of gluons near the saturation scale, versus the solution of the small-x JIMWLK renormalization group, which generates essentially scale invariant fluctuations above the absorptive boundary set by the saturation scale.
description: 14 pages, 5 figures; v2: added section IV-A to discuss the parametric dependence of the selected fluctuations on the number of colors and on the thickness of the target; v3: version accepted to Phys. Rev. D
Universal Entanglement Dynamics following a Local Quench
Creators: name: Vasseur, Romain
name: Saleur, Hubert
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the time dependence of the entanglement between two quantum wires after suddenly connecting them via tunneling through an impurity. The result at large times is given by the well known formula $S(t) \approx {1\over 3}\ln {t}$. We show that the intermediate time regime can be described by a universal cross-over formula $S=F(tT_K)$, where $T_K$ is the crossover (Kondo) temperature: the function $F$ describes the dynamical "healing" of the system at large times. We discuss how to obtain analytic information about $F$ in the case of an integrable quantum impurity problem using the massless Form-Factors formalism for twist and boundary condition changing operators. Our results are confirmed by density matrix renormalization group calculations and exact free fermion numerics.
description: v3: minor changes
D-WP3.1_MATRIX Report on output-based surveillance system selection methodology
Creators: name: Horigan, Verity
name: Conrady, Beate
name: Nielsen, Liza Rosenbaum
name: Houe, Hans
name: Arnold, Mark
name: Lawes, Jo
name: Davies, Rob
name: Comin, Arianna
name: Young, Beth
name: Agren, Estelle
name: Lukasz Bocian
name: Zietek-Bocian, Anna
name: Stolarek, Agnieszka
name: Mirek Rozycki
name: Dewar, Rob
name: Rivers, Sam
name: Kent, Alex
name: Gonzales, Jose
name: Gerhards, Nora
name: Van Der Poel, Wim
Publisher: name: Zenodo
Year: 2022
Subjects: MATRIX
Output based surveillance

description: OHEJP Project: MATRIX
Scalable explicit implementation of anisotropic diffusion with Runge-Kutta-Legendre super-time-stepping
Creators: name: Vaidya, Bhargav
name: Prasad, Deovrat
name: Mignone, Andrea
name: Sharma, Prateek
name: Rickler, Luca
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: An important ingredient in numerical modelling of high temperature magnetised astrophysical plasmas is the anisotropic transport of heat along magnetic field lines from higher to lower temperatures.Magnetohydrodynamics (MHD) typically involves solving the hyperbolic set of conservation equations along with the induction equation. Incorporating anisotropic thermal conduction requires to also treat parabolic terms arising from the diffusion operator. An explicit treatment of parabolic terms will considerably reduce the simulation time step due to its dependence on the square of the grid resolution ($Δx$) for stability. Although an implicit scheme relaxes the constraint on stability, it is difficult to distribute efficiently on a parallel architecture. Treating parabolic terms with accelerated super-time stepping (STS) methods has been discussed in literature but these methods suffer from poor accuracy (first order in time) and also have difficult-to-choose tuneable stability parameters. In this work we highlight a second order (in time) Runge Kutta Legendre (RKL) scheme (first described by Meyer et. al. 2012) that is robust, fast and accurate in treating parabolic terms alongside the hyperbolic conversation laws. We demonstrate its superiority over the first order super time stepping schemes with standard tests and astrophysical applications. We also show that explicit conduction is particularly robust in handling saturated thermal conduction. Parallel scaling of explicit conduction using RKL scheme is demonstrated up to more than $10^4$ processors.
description: 15 pages, 9 figures, incorporated comments from the referee. This version is now accepted for publication in MNRAS
Exact solution of corner-modified banded block-Toeplitz eigensystems
Creators: name: Cobanera, Emilio
name: Alase, Abhijeet
name: Ortiz, Gerardo
name: Viola, Lorenza
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Motivated by the challenge of seeking a rigorous foundation for the bulk-boundary correspondence for free fermions, we introduce an algorithm for determining exactly the spectrum and a generalized-eigenvector basis of a class of banded block quasi-Toeplitz matrices that we call corner-modified. Corner modifications of otherwise arbitrary banded block-Toeplitz matrices capture the effect of boundary conditions and the associated breakdown of translational invariance. Our algorithm leverages the interplay between a non-standard, projector-based method of kernel determination (physically, a bulk-boundary separation) and families of linear representations of the algebra of matrix Laurent polynomials. Thanks to the fact that these representations act on infinite-dimensional carrier spaces in which translation symmetry is restored, it becomes possible to determine the eigensystem of an auxiliary projected block-Laurent matrix. This results in an analytic eigenvector Ansatz, independent of the system size, which we prove is guaranteed to contain the full solution of the original finite-dimensional problem. The actual solution is then obtained by imposing compatibility with a boundary matrix, also independent of system size. As an application, we show analytically that eigenvectors of short-ranged fermionic tight-binding models may display power-law corrections to exponential decay, and demonstrate the phenomenon for the paradigmatic Majorana chain of Kitaev.
description: 42 pages, no figures. Improved presentation, minor inaccuracies fixed. Published version
The multiplicity of massive stars: a 2016 view
Creators: name: Sana, Hugues
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Massive stars like company. Here, we provide a brief overview of progresses made over the last 5 years by a number of medium and large surveys. These results provide new insights on the observed and intrinsic multiplicity properties of main sequence massive stars and on the initial conditions for their future evolution. They also bring new interesting constraints on the outcome of the massive star formation process.
description: To appear in Proceedings of IAY Symposium 329; 1 table, 7 figures [Revised version: typos and updated references]
Constraints on top quark non-standard interactions from Higgs and $t \bar t$ production cross sections
Creators: name: Barducci, D.
name: Fabbrichesi, M.
name: Tonero, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We identify the differential cross sections for $t\bar t$ production and the total cross section for Higgs production through gluon fusion as the processes in which the two effective operators describing the leading non-standard interactions of the top quark with the gluon can be disentangled and studied in an independent fashion. Current data on the Higgs production and the $ {\rm d}σ/{\rm d} {p^t_T}$ differential cross section provide limits comparable, but not more stringent, than those from the total $t\bar t$ cross sections measurements at the LHC and Tevatron, where however the two operators enter on the same footing and can only be constrained together. Given the present uncertainties, we find that the most stringent bounds are provided by a combination of data on the $t \bar t$ total cross sections together with those from the Higgs production. We conclude by stating the (modest) reduction in the uncertainties necessary to provide more stringent limits by means of the Higgs production and $t\bar t$ differential cross section observables at the LHC with the future luminosity of 300 and 3000 fb$^{-1}$.
description: 12 pages, 9 figures, 3 tables. Discussion with the relation of the considered operators with the ones of the Warsaw basis extended. Missing contribution to the gluon fusion amplitude added. Main results unchanged
Isotropic-Nematic Phase Transitions in Gravitational Systems
Creators: name: Roupas, Zacharias
name: Kocsis, Bence
name: Tremaine, Scott
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine dense self-gravitating stellar systems dominated by a central potential, such as nuclear star clusters hosting a central supermassive black hole. Different dynamical properties of these systems evolve on vastly different timescales. In particular, the orbital-plane orientations are typically driven into internal thermodynamic equilibrium by vector resonant relaxation before the orbital eccentricities or semimajor axes relax. We show that the statistical mechanics of such systems exhibit a striking resemblance to liquid crystals, with analogous ordered-nematic and disordered-isotropic phases. The ordered phase consists of bodies orbiting in a disk in both directions, with the disk thickness depending on temperature, while the disordered phase corresponds to a nearly isotropic distribution of the orbit normals. We show that below a critical value of the total angular momentum, the system undergoes a first-order phase transition between the ordered and disordered phases. At the critical point the phase transition becomes second-order while for higher angular momenta there is a smooth crossover. We also find metastable equilibria containing two identical disks with mutual inclinations between $90^{\circ}$ and $180^\circ$.
description: 33 pages, 23 figures; minor changes to match the published version
Holarchical Innovation Teams: Principles Part I
Creators: name: F. Reber, Michael
Publisher: name: Economia Aziendale Online -
Year: 2023
Subjects: antecedent sociality, combinatory system, complementa¬rity of personal excellences, congeniality of personal excellences, consequent sociality, creative work, distributive justice, enjoy, eudaimonism, experiential learning, generosity, ...

description: This paper builds upon “Holarchical Innovation Teams: Philosophy” in volume 14, issue 1 of Economia Aziendale Online by establishing principles for the nascent discipline of Holarchical Innovation Teams (HITs). The principles stem from the tripartite philosophy of HITs: Human Dignity, Creative Work, and Holarchical Combinatory Value-Creation. This paper addresses in-depth the first two basic HITs principles of Human Dignity and Creative Work. A subsequent paper by the author will address the third principle of Holarchical Combinatory Value-Creation.
description: Economia Aziendale Online -, Vol 14, No 2 (2023): ISSUE 2/2023
Prediction and Characterization of Multiple Extremal Paths in Continuously Monitored Qubits
Creators: name: Lewalle, Philippe
name: Chantasri, Areeya
name: Jordan, Andrew N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine most-likely paths between initial and final states for diffusive quantum trajectories in continuously monitored pure-state qubits, obtained as extrema of a stochastic path integral. We demonstrate the possibility of "multipaths" in the dynamics of continuously-monitored qubit systems, wherein multiple most-likely paths travel between the same pre- and post-selected states over the same time interval. Most-likely paths are expressed as solutions to a Hamiltonian dynamical system. The onset of multipaths may be determined by analyzing the evolution of a Lagrange manifold in this phase space, and is mathematically analogous to the formation of caustics in ray optics or semiclassical physics. Additionally, we develop methods for finding optimal traversal times between states, or optimal final states given an initial state and evolution time; both give insight into the measurement dynamics of continuously-monitored quantum states. We apply our methods in two systems: a qubit with two non-commuting observables measured simultaneously, and a qubit measured in one observable while subject to Rabi drive. In the two-observable case we find multipaths due to caustics, bounded by a diverging Van-Vleck determinant, and their onset time. We also find multipaths generated by paths with different "winding numbers" around the Bloch sphere in both systems.
description: 20 pages, 8 figures. Compared with version 1, version 2 contains an additional appendix, as well as minor revisions / clarifications based partly on referee feedback at Phys. Rev. A
FAIR Software for the Social Sciences
Creators: name: de Boer, Lieke
name: Cammarata, Emilio
name: Martinez Ortiz, Carlos
name: Maineri, Angelica
Publisher: name: Zenodo
Year: 2023
Subjects: FAIR
software
codes
data
data analysis

description: Research software is widely used by researchers from all fields. Research software represents the set
 of operations and instructions to shape raw data to analytical and computational purposes. In this blog post, we describe
 how the FAIR principles apply to research software and point to useful resources.
Wilsonian RG-flow approach to holographic transport with momentum dissipation
Creators: name: Tian, Yu
name: Ge, Xian-Hui
name: Wu, Shao-Feng
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We systematically present a new approach for studying the coupled linear transport of holographic systems. In this approach, the set of equations for the linear perturbations can be reduced to a first-order nonlinear ordinary differential equation expressed as the radial (renormalization group) flow equation of the transport matrices. As an important application, we use this approach to compute the DC and AC conductivities of a holographic model with momentum dissipation, which can be easily read off from the nonlinear flow equations. This method also works for transport in the presence of an external magnetic field.
description: 1+26 pages, 6 figures, minor changes, published version
Standard Model Parton Distributions at Very High Energies
Creators: name: Bauer, Christian W.
name: Ferland, Nicolas
name: Webber, Bryan R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We compute the leading-order evolution of parton distribution functions for all the Standard Model fermions and bosons up to energy scales far above the electroweak scale, where electroweak symmetry is restored. Our results include the 52 PDFs of the unpolarized proton, evolving according to the SU(3), SU(2), U(1), mixed SU(2) x U(1) and Yukawa interactions. We illustrate the numerical effects on parton distributions at large energies, and show that this can lead to important corrections to parton luminosities at a future 100 TeV collider.
description: 30 pages, 7 figures. Improved treatment of input PDFs at 100 GeV. Adjusted plotting style to show features more clearly. Main results and conclusions unchanged
Out-of-Equilibrium Spin Transport in Mesoscopic Superconductors
Creators: name: Quay, CHL
name: Aprili, M
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The excitations in conventional superconductors, Bogoliubov quasiparticles, are spin-1/2 fermions but their charge is energy-dependent and, in fact, zero at the gap edge. Therefore, in superconductors (unlike normal metals) the spin and charge degrees of freedom may be separated. In this article, we review spin injection into conventional superconductors and focus on recent experiments on mesoscopic superconductors. We show how quasiparticle spin transport and out-of-equilibrium spin dependent superconductivity can be triggered using the Zeeman splitting of the quasiparticle density of states in thin-film superconductors with small spin-mixing scattering. Finally, we address the spin dynamics and the feedback of quasiparticle spin imbalances on the strength of the superconducting energy gap.
description: 18 pages, 5 figures
Integrable Structure of Multispecies Zero Range Process
Creators: name: Kuniba, Atsuo
name: Okado, Masato
name: Watanabe, Satoshi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We present a brief review on integrability of multispecies zero range process in one dimension introduced recently. The topics range over stochastic $R$ matrices of quantum affine algebra $U_q (A^{(1)}_n)$, matrix product construction of stationary states for periodic systems, $q$-boson representation of Zamolodchikov-Faddeev algebra, etc. We also introduce new commuting Markov transfer matrices having a mixed boundary condition and prove the factorization of a family of $R$ matrices associated with the tetrahedron equation and generalized quantum groups at a special point of the spectral parameter.
Local Uniqueness and Refined Spike Profiles of Ground States for Two-Dimensional Attractive Bose-Einstein Condensates
Creators: name: Guo, Yujin
name: Lin, Changshou
name: Wei, Juncheng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider ground states of two-dimensional Bose-Einstein condensates in a trap with attractive interactions, which can be described equivalently by positive minimizers of the $L^2-$critical constraint Gross-Pitaevskii energy functional. It is known that ground states exist if and only if $a< a^*:= \|w\|_2^2$, where $a$ denotes the interaction strength and $w$ is the unique positive solution of $Δw-w+w^3=0$ in $R^2$. In this paper, we prove the local uniqueness and refined spike profiles of ground states as $a\nearrow a^*$, provided that the trapping potential $h(x)$ is homogeneous and $H(y)=\int_{R^2} h(x+y)w^2(x)dx$ admits a unique and non-degenerate critical point.
description: 43 pages
Does information entropy play a role in the expansion and acceleration of the Universe?
Creators: name: Pandey, Biswajit
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose an interpretation of the expansion and acceleration of the Universe from an information theoretic viewpoint. We obtain the time evolution of the configuration entropy of the mass distribution in a static Universe and show that the process of gravitational instability leads to a rapid dissipation of configuration entropy during the growth of the density fluctuations making such a Universe entropically unfavourable. We find that in an expanding Universe, the configuration entropy rate is governed by the expansion rate of the Universe and the growth rate of density fluctuations. The configuration entropy rate becomes smaller but still remains negative in a matter dominated Universe and eventually becomes zero at some future time in a $Λ$ dominated Universe. The configuration entropy may have a connection to the dark energy and possibly plays a driving role in the current accelerating expansion of the Universe leading the Universe to its maximum entropy configuration.
description: 4 pages, no figures, minor revision, Accepted for publication in MNRAS Letters
MPEC 2024-Q70 : 2024 QD1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 QD1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The intention-implementation gap for community involvement in urban waterways governance: a scoping review
Creators: name: Perera, Ethamadalage Dineth
name: Moglia, Magnus
name: Glackin, Stephen
name: Woodcock, Ian
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Urban waterways as a subset of Nature-based solutions promote many functions, particularly in a warming climate by providing benefits for people and nature to adapt to critical social-ecological challenges. It has been widely suggested that a mechanism for unlocking those benefits is to promote active community involvement in governance. However, this practice is not widely adopted despite a common intention to do so. In this article, we review the evidence around such practices and why there is an intention-implementation gap. The review is based on analysis of 51 peer-reviewed scholarly works using a conceptual framework (Values, Rules, Knowledge) that has previously been applied to understand inertia in the adoption of climate adaptation practices. This framework provides an analytical lens to identify critical knowledge gaps by focusing firmly on factors that influence decision contexts. The review has revealed that whilst there are many academic papers outlining the hypothesised benefits of community involvement in urban waterways governance, there is much less detail about practices, risks, costs, or the lived experience of decision-makers. Nor is there much advice on the methods that can be used to implement the practice in a manner that effectively unlocks co-benefits. We argue that such evidence is urgently needed as it will allow the practice to be more widely adopted.
Motion of magnetically charged particles in a magnetically charged stringy black hole spacetime
Creators: name: González, P. A.
name: Olivares, Marco
name: Papantonopoulos, Eleftherios
name: Saavedra, Joel
name: Vásquez, Yerko
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the motion of massive particles with electric and magnetic charges in the background of a magnetically charged Garfinkle-Horowitz-Strominger stringy black hole. We solve analytically the equations of motion of the test particles and we describe the orbital motion in terms of the Weierstrass elliptic functions. We find that there are critical values of the magnetic charge of the black hole and the magnetic charge of the test particle which characterize the bound and unbound orbits and we study two observables, the perihelion shift and the Lense-Thirring effect. The trajectories depend on the electric and magnetic charges of the test particle. While the angular-motion depends on the electric charge of the test particle, the $r$ and $t$-motion depends on the mass and the magnetic charge of the test particle.
description: Version accepted for publication in PRD
Perceived differential vulnerability and climate change-related hazards in informal settlements in Accra, Ghana: re-thinking vulnerability to climate change in urban areas
Creators: name: Adams, Ishmael
name: Ghosh, S.
name: Runeson, G.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Physiology
subject: Biotechnology
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

description: Urbanisation in developing countries has co-evolved with exposure to hazards among the urban poor. Yet, current understandings of hazard vulnerability are context-specific and limiting for shedding light on perceived vulnerability to climate change in the context of informal urbanisation. The overall perception of informal dwellers on the causative and local factors that underly the processes of informal urbanisation and their hazard exposure and consequent vulnerability tends to receive less attention. Using Accra as a case and applying mixed methods, this paper analyses informal residents’ perceived vulnerability to hazards. A total of 582 households’ surveys and 3 institutional key informant interviews were conducted. The paper argues that hazard vulnerability in informal settlements is spatially differentiated and differentially perceived. The main factor associated with respondents’ perceived vulnerability was “threats of eviction”. Examination of informal dwellers’ hazard responses will improve our understanding of the influence of their perceptions on hazard responses in the context of informal urbanisation.
Varieties of sums of powers and moduli spaces of (1,7)-polarized abelian surfaces
Creators: name: Bolognesi, Michele
name: Massarenti, Alex
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G10, 11G15, 14K10 (Primary), 14E05, 14E08, 14M20 (Secondary)

description: We study the geometry of some varieties of sums of powers related to the Klein quartic. This allows us to describe the birational geometry of certain moduli spaces of abelian surfaces. In particular we show that the moduli space $\mathcal{A}_2(1,7)^{-}_{sym}$ of $(1,7)$-polarized abelian surfaces with a symmetric theta structure and an odd theta characteristic is unirational by showing that it admits a dominant morphism from a unirational conic bundle.
description: 14 pages
Additional file 1 of Does the “state of disaster” response have a downside? Hospital incident command group leaders’ experiences of a terrorist-induced major incident: a qualitative study
Creators: name: Murphy, Jason P.
name: Hörberg, Anna
name: RN, Monica Rådestad
name: Kurland, Lisa
name: Jirwe, Maria
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Pharmacology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Statistics
subject: FOS: Mathematics
subject: Science Policy
subject: Mental Health
subject: Plant Biology
subject: FOS: Biological sciences

description: Supplementary Material 1
Angpow: a software for the fast computation of accurate tomographic power spectra
Creators: name: Campagne, J. -E.
name: Neveu, J.
name: Plaszczynski, S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The statistical distribution of galaxies is a powerful probe to constrain cosmological models and gravity. In particular the matter power spectrum $P(k)$ brings information about the cosmological distance evolution and the galaxy clustering together. However the building of $P(k)$ from galaxy catalogues needs a cosmological model to convert angles on the sky and redshifts into distances, which leads to difficulties when comparing data with predicted $P(k)$ from other cosmological models, and for photometric surveys like LSST. The angular power spectrum $C_\ell(z_1,z_2)$ between two bins located at redshift $z_1$ and $z_2$ contains the same information than the matter power spectrum, is free from any cosmological assumption, but the prediction of $C_\ell(z_1,z_2)$ from $P(k)$ is a costly computation when performed exactly. The Angpow software aims at computing quickly and accurately the auto ($z_1=z_2$) and cross ($z_1 \neq z_2$) angular power spectra between redshift bins. We describe the developed algorithm, based on developments on the Chebyshev polynomial basis and on the Clenshaw-Curtis quadrature method. We validate the results with other codes, and benchmark the performance. Angpow is flexible and can handle any user defined power spectra, transfer functions, and redshift selection windows. The code is fast enough to be embedded inside programs exploring large cosmological parameter spaces through the $C_\ell(z_1,z_2)$ comparison with data. We emphasize that the Limber's approximation, often used to fasten the computation, gives wrong $C_\ell$ values for cross-correlations.
description: Published in Astronomy & Astrophysics
To What Extent Does Organizational Culture Affect Employee Commitment? An Explorative Study in Italian Companies
Creators: name: Farao, Caterina
Publisher: name: Economia Aziendale Online -
Year: 2023
Subjects: organizational culture, employees’ commitment, human capital, cultural dimensions, Italian companies

description: One of the greatest assets companies have, in order to be successful in today’s economy, is "human capital", and with that also comes the challenge to retain employees within the company itself. For this reason, it is very important to consider "organizational culture" and "employees’ commitment". The aim of this research is to analyze the relationship between these two crucial aspects, with a specific focus on the Italian context. Starting from the review of the extant literature and models, this relationship has been further investigated with the support of statistical analysis to empirically assess which organizational model is more related to a higher level of employees’ commitment. Based on data collected through questionnaires and interviews, the results of the empirical analyses show how the "clan organizational culture style" can generate a higher level of commitment among employees, with employees expressing their commitment in the form of "affectionate commitment". Furthermore, commitment has been found to be related to employees’ age and the size of the firm where respondents work, and not to the nature of the work itself. Moreover, the findings revealed the relevance of "organizational culture" in forming "employees’ commitment". Indeed, firms wanting to increase their employees’ commitment have to create a challenging, fair, and pleasant work environment in which commitment can grow. Additionally, our findings may suggest future studies to focus on the relationship between employees’ commitment and job opportunities, and on the motivations that guide workers' choice between different job opportunities.
description: Economia Aziendale Online -, Vol 14, No 2 (2023): ISSUE 2/2023
Localization and chiral properties near the ordering transition of an Anderson-like toy model for QCD
Creators: name: Giordano, Matteo
name: Kovacs, Tamas G.
name: Pittler, Ferenc
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The Dirac operator in finite temperature QCD is equivalent to the Hamiltonian of an unconventional Anderson model, with on-site noise provided by the fluctuations of the Polyakov lines. The main features of its spectrum and eigenvectors, concerning the density of low modes and their localization properties, are qualitatively reproduced by a toy-model random Hamiltonian, based on an Ising-type spin model mimicking the dynamics of the Polyakov lines. Here we study the low modes of this toy model in the vicinity of the ordering transition of the spin model, and show that at the critical point the spectral density at the origin has a singularity, and the localization properties of the lowest modes change. This provides further evidence of the close relation between deconfinement, chiral transition and localization of the low modes.
description: 11 pages, 7 figures
title: Κυκλική οικονομία σε Ελλάδα και εξωτερικό : τάσεις και προοπτικές για το μέλλον
title: Cyclical economy in Greece and abroad : trends and prospects for the future
titleType: AlternativeTitle
Creators: name: Ντούρος, Νικόλαος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2022
Subjects: subject: Kυκλική οικονομία
subject: Βιώσιμη ανάπτυξη
subject: Περιβάλλον
subject: Καινοτομία
subject: Επιχειρηματικότητα

description: Στις μέρες μας για να μπορεί να υπάρχει μια συνεχής ανάπτυξη της κοινωνίας με παράλληλη εξασφάλιση επάρκειας φυσικών πόρων και να επιτευχθεί ένα κλίμα ασφάλειας και σταθερότητας κρίνεται απαραίτητη προϋπόθεση η υιοθέτηση ενός νέου οικονομικού μοντέλου ανάπτυξης. Αυτό που θα κάνει θα είναι να περιορίζει τα απόβλητα, αλλά και θα μειώνει την ανάγκη για νέους πόρους που πρέπει να αντληθούν με μεγάλο οικονομικό και περιβαλλοντικό κόστος. Ο όρος της βιώσιμης ανάπτυξης αφορά την υιοθέτηση ενός τέτοιου μοντέλου για την οικονομία και την κοινωνία, το οποίο θα αναβαθμίσει το βιοτικό επίπεδο των ανθρώπων, καθώς θα χρησιμοποιεί με ευφυές τρόπο τους πόρους της σύγχρονης οικονομίας και θα μπορέσει να συμβάλλει στην ευημερία των πολιτών. Η μετάβαση από την παραδοσιακή στην κυκλική οικονομία, εκεί που συμπεριλαμβάνεται και η κυκλική βιοοικονομίας, θεωρείται τόσο από τις επιχειρήσεις όσο και από ιδιώτες που ασχολούνται με το ζήτημα αλλά και τις κυβερνήσεις των χωρών μια πολύ μεγάλη ευκαιρία που μπορεί να δημιουργήσει ορισμένα ανταγωνιστικά πλεονεκτήματα σε βιώσιμη βάση. Η συγκεκριμένη εργασία έχει σαν σκοπό ξεκινώντας από τις αρχές τις βιώσιμης ανάπτυξης και της κυκλικής οικονομίας να αναδείξει τρόπους μέσω από μελέτες περίπτωσης που υπάρχει εφαρμογή τους σε επιχειρηματικά μοντέλα στο τομέα των τροφίμων, του καφέ αλλά και της συλλογής και μεταποίησης των απορριμμάτων. Έχοντας τις βασικές πληροφορίες από αυτές τις περιπτώσεις έχει ως στόχο της να παρουσιάσει ένα νέο μοντέλο κυκλικής οικονομίας βασισμένο στις αρχές της καινοτομίας και της επιχειρηματικότητας.
A Lightcone Catalogue from the Millennium-XXL Simulation
Creators: name: Smith, Alex
name: Cole, Shaun
name: Baugh, Carlton
name: Zheng, Zheng
name: Angulo, Raul
name: Norberg, Peder
name: Zehavi, Idit
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Future galaxy surveys require realistic mock catalogues to understand and quantify systematics in order to make precise cosmological measurements. We present a halo lightcone catalogue and halo occupation distribution (HOD) galaxy catalogue built using the Millennium-XXL (MXXL) simulation. The halo catalogue covers the full sky, extending to z = 2 with a mass resolution of ~1e11 Msun/h . We use this to build a galaxy catalogue, which has an r-band magnitude limit of r < 20.0, with a median redshift of z~0.2. A Monte Carlo HOD method is used to assign galaxies to the halo lightcone catalogue, and we evolve the HODs to reproduce a target luminosity function; by construction, the luminosity function of galaxies in the mock is in agreement with the Sloan Digital Sky Survey (SDSS) at low redshifts and the Galaxy and Mass Assembly (GAMA) survey at high redshifts. A Monte Carlo method is used to assign a 0.1(g-r) colour to each galaxy, and the colour distribution of galaxies at different redshifts agrees with measurements from GAMA. The clustering of galaxies in the mock for galaxies in different magnitude and redshift bins is in good agreement with measurements from SDSS and GAMA, and the colour-dependent clustering is in reasonable agreement. We show that the baryon acoustic oscillation (BAO) can be measured in the mock catalogue, and the redshift space distortions (RSDs) are in agreement with measurements from SDSS, illustrating that this catalogue will be useful for upcoming surveys.
description: 18 pages, 18 figures, 1 table, accepted for publication in MNRAS. Halo and galaxy catalogues are available at http://icc.dur.ac.uk/data/ and https://tao.asvo.org.au/tao/
Perturbative evolution: a different approach at small x
Creators: name: Donnachie, A
name: Landshoff, P V
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We propose an approach to DGLAP evolution at small x that circumvents the usual problem that a perturbation expansion is not valid there. The data for the charm structure function are important to motivate the method, and it describes them much more successfully than the conventional approach.
description: 12 pages, 11 figures
Parents’ Question Asking Behavior in Low-Socioeconomic Status Families
Creators: name: Cheng, Sirui
Publisher: name: University of Chicago
Year: 2022
Subjects: subject: low SES family
subject: parent-child interaction
subject: math learning
subject: pedagogical question

description: In this paper, we argued for the significance of research into parent-child interactions and the necessity of observing these dynamics in low-SES families. As an essential aspect of interaction, parental question-asking was categorized into three classifications: pedagogical questions, information-seeking questions, and rhetorical questions, to examine the variances in parental question-asking in a math-related context. The main objective of this study was to probe how parents in low-SES families communicated with their children by using various types of math-related questions in three given tasks simulating daily scenarios. We observed that parents from low-SES backgrounds frequently asked questions in conversation, with the majority of those questions exhibiting a pedagogical focus. The secondary objective was to explore the association between math pedagogical questions and mathematical performance, and children’s gender and their math achievement. The W score was utilized to measure the mathematical proficiency of the children. The findings revealed that while there was no correlation between math pedagogical questions and the W score, a marginal effect of gender was found regarding math achievement and a correlation was identified between parental income and children's W score.
A study of aging effects of barrel Time-Of-Flight system in the BESIII experiment
Creators: name: Liu, Huan-Huan
name: Sun, Sheng-Sen
name: Fang, Shuang-Shi
name: Wu, Zhi
name: Dai, Hong-Liang
name: Heng, Yue-Kun
name: Zhou, Ming
name: Deng, Zi-Yan
name: Liu, Huai-Min
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The Time-Of-Flight system consisting of plastic scintillation counters plays an important role for particle identification in the BESIII experiment at the BEPCII double ring $e^+e^-$ collider. Degradation of the detection efficiency of the barrel TOF system has been observed since the start of physical data taking and this effect has triggered intensive and systematic studies about aging effects of the detector. The aging rates of the attenuation lengths and relative gains are obtained based on the data acquired in past several years. This study is essential for ensuring an extended operation of the barrel TOF system in optimal conditions.
description: 14 pages, 8 figures
Critical Review: Measures of Digital Competency related to Employability
Creators: name: Baah-Acheamfuor, Kwame
name: Qutieshat, Abubaker
name: Yangailo, Tryson
Publisher: name: Economia Aziendale Online -
Year: 2023
Subjects: digital competency, employability, framework, proficiency, problem solving

description: Digital competence could gain a competitive advantage for enterprises. The study was to understand the relationship between digital competence and employability. The evolution of the European Union Digital Competency frameworks was analyzed to derive measures that could be tested with employers. DigComp 2.2 provides an integrated framework of competency areas, their descriptors, proficiency levels, skills, attitudes, and knowledge applicable to employability. Knowledge was the key driver of digital competency, with measures of artificial intelligence emerging across competency areas. Also, attitudes were found to have a moderating effect between digital competency and employability. However, due to the diverse nature and employability requirements by firms and from different economic sectors, further studies targeted at a diverse group of employers could establish digital competencies in demand.
description: Economia Aziendale Online -, Vol 14, No 2 (2023): ISSUE 2/2023
The Observable Properties of Cool Winds from Galaxies, AGN, and Star Clusters. I. Theoretical Framework
Creators: name: Krumholz, Mark R.
name: Thompson, Todd A.
name: Ostriker, Eve C.
name: Martin, Crystal L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Winds arising from galaxies, star clusters, and active galactic nuclei are crucial players in star and galaxy formation, but it has proven remarkably difficult to use observations of them to determine physical properties of interest, particularly mass fluxes. Much of the difficulty stems from a lack of a theory that links a physically-realistic model for winds' density, velocity, and covering factors to calculations of light emission and absorption. In this paper we provide such a model. We consider a wind launched from a turbulent region with a range of column densities, derive the differential acceleration of gas as a function of column density, and use this result to compute winds' absorption profiles, emission profiles, and emission intensity maps in both optically thin and optically thick species. The model is sufficiently simple that all required computations can be done analytically up to straightforward numerical integrals, rendering it suitable for the problem of deriving physical parameters by fitting models to observed data. We show that our model produces realistic absorption and emission profiles for some example cases, and argue that the most promising methods of deducing mass fluxes are based on combinations of absorption lines of different optical depths, or on combining absorption with measurements of molecular line emission. In the second paper in this series, we expand on these ideas by introducing a set of observational diagnostics that are significantly more robust that those commonly in use, and that can be used to obtain improved estimates of wind properties.
description: 26 pages, 20 figures, accepted to MNRAS; minor text changes from previous version; software described is available from https://bitbucket.org/krumholz/despotic
Anisotropic multiple bounce models
Creators: name: Bacalhau, Anna Paula
name: Peter, Patrick
name: Vitenti, Sandro D. P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the Galileon ghost condensate implementation of a bouncing cosmological model in the presence of a non negligible anisotropic stress. We exhibit its structure, which we find to be far richer than previously thought. In particular, even restricting attention to a single set of underlying microscopic parameters, we obtain, numerically, many qualitatively different regimes: depending on the initial conditions on the scalar field leading the dynamics of the universe, the contraction phase can evolve directly towards a singularity, avoid it by bouncing once, or even bounce many times before settling into an ever-expanding phase. We clarify the behavior of the anisotropies in these various situations.
description: 11 pages, 9 figures, minor corrections
Additional file 1 of Awareness and attitudes of pregnant women concerning genetic disorders and pregnancy termination in northeastern Iran
Creators: name: Todarbary, Nafiseh
name: Irandegani, Abouzar
name: Meshkat, Mostafa
name: Gholoobi, Aida
name: Hamzehloei, Tayebeh
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Biotechnology
subject: Science Policy
subject: Mental Health

description: Supplementary file 1.