cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamical mass measurements of two protoplanetary discs
Creators: name: Lodato, G.
name: Rampinelli, L.
name: Viscardi, E.
name: Longarini, C.
name: Inzquierdo, A.
name: Paneque-Carreno, T.
name: Testi, L.
name: Facchini, S.
name: Miotello, A.
name: Veronesi, B.
name: Hall, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: ALMA observations of line emission from planet forming discs have demonstrated to be an excellent tool to probe the internal disc kinematics, often revealing subtle effects related to important dynamical processes occurring in them, such as turbulence, or the presence of planets, that can be inferred from pressure bumps perturbing the gas motion, or from detection of the planetary wake. In particular, we have recently shown for the case of the massive disc in Elias 2-27 how one can use such kind of observations to measure deviations from Keplerianity induced by the disc self-gravity, thus constraining the total disc mass with good accuracy and independently on mass conversion factors between the tracer used and the total mass. Here, we refine our methodology and extend it to two additional sources, GM Aur and IM Lup, for which archival line observations are available for both the 12CO and the 13CO line. For IM Lup, we are able to obtain a consistent disc mass of Mdisc=0.1 Msun, implying a disc-star mass ratio of 0.1 (consistent with the observed spiral structure in the continuum emission) and a gas/dust ratio of ~ 65 (consistent with standard assumptions), with a systematic uncertainty by a factor ~2 due to the different methods to extract the rotation curve. For GM Aur, the two lines we use provide slightly inconsistent rotation curves, that cannot be attributed only to a difference in the height of the emitting layer, nor to a vertical temperature stratification. Our best fit disc mass measurement is Mdisc=0.26Msun, implying a disc-star mass ratio of ~0.35 and a gas/dust ratio of ~130... ABRIDGED
description: 14 pages, 10 figures, MNRAS in press
A system function component model for magnetic particle imaging with anisotropic particles
Creators: name: Maass, Marco
name: Droigk, Christine
name: Eulers, Mathias
name: Mertins, Alfred
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: In this work, it is demonstrated how an extended equilibrium magnetization model that allows modeling of uniaxial anisotropy for the nanoparticles can be integrated into the system function component model for magnetic particle imaging with a field-free point moving along a Lissajous trajectory. In previous works, the particle model with anisotropy has been shown to describe the measured system function better than the classical Langevin model of paramagnetism. However, the question arises how this model relates to the observed tensor products of the Chebyshev polynomials in the Fourier series components of the system function. Static uniaxial anisotropy is assumed in this work. It is shown that the structure compared to the isotropic solution can be preserved in this case.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Analytical representations of unified equations of state for neutron-star matter
Creators: name: Potekhin, A. Y.
name: Fantina, A. F.
name: Chamel, N.
name: Pearson, J. M.
name: Goriely, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Context. A unified equation of state (EoS) should describe the crust and the core of a neutron star using the same physical model. The Brussels-Montreal group has recently derived a family of such EoSs based on the nuclear energy-density functional theory with generalized Skyrme effective forces, fitted to the available mass data. At the same time, these forces were constrained to reproduce microscopic calculations of homogeneous neutron matter based on realistic two- and three-nucleon forces. Aims. We represent basic physical characteristics of the latest Brussels-Montreal EoS models by analytical expressions to facilitate their inclusion in astrophysical simulations. Methods. We consider three EoS models, which significantly differ by stiffness: BSk19, BSk20, and BSk21. For each of them we constructed two versions of the EoS parametrization. In the first version, pressure P and gravitational mass density ρare given as functions of the baryon number density n_b. In the second version, P, ρ, and n_b are given as functions of pseudo-enthalpy, which is useful for two-dimensional calculations of stationary rotating configurations of neutron stars. In addition to the EoS, we derived analytical expressions for several related quantities that are required in neutron-star simulations: number fractions of electrons and muons in the stellar core, nucleon numbers per nucleus in the inner crust, and equivalent radii and shape parameters of the nuclei in the inner crust. Results. We obtain analytical representations for the basic characteristics of the models of cold dense matter, which are most important for studies of neutron stars. We demonstrate the usability of our results by applying them to calculations of neutron-star mass-radius relations, maximum and minimum masses, thresholds of direct Urca processes, and the electron conductivity in the neutron-star crust.
description: 13 pages, 10 figures, 10 tables. In v.2, minor typos in the text and references are fixed. In v.3 and v.4, typos in Table 6 and Eq.(17), respectively, are fixed. In v.5, labels on Fig.7 are corrected
Bringing Students into the Picture: Teaching with Tableaux Vivants
Creators: name: Foutch, Ellery
Publisher: name: Middlebury
Year: 2022
Subjects: Curriculum and pedagogy
Humanities and social sciences curriculum and pedagogy (excl. economics, business and management)

description: This article explores a recent experiment in implementing tableaux vivants as a college-level art history assignment, in which students researched works of art and also assumed the pose, posture, and attributes of the work; students were also invited to reconceptualize and think transformatively about these historical works. Drawing upon the principles of Universal Design for Learning, the assignment offers an impetus for close looking, research, critical thinking, interpretation and creativity, and an engagement in metacognitive and embodied experiences, as will be demonstrated by the resulting assignments and students' written self-reflections. While the assignment was originally designed for a course focused on American culture prior to 1830, this approach could apply to a broad chronological and geographical range to encompass nearly any figurative art.
Computing exact $D$-optimal designs by mixed integer second-order cone programming
Creators: name: Sagnol, Guillaume
name: Harman, Radoslav
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistics Theory (math.ST)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Let the design of an experiment be represented by an $s$-dimensional vector $\mathbf {w}$ of weights with nonnegative components. Let the quality of $\mathbf {w}$ for the estimation of the parameters of the statistical model be measured by the criterion of $D$-optimality, defined as the $m$th root of the determinant of the information matrix $M(\mathbf {w})=\sum_{i=1}^sw_iA_iA_i^T$, where $A_i,i=1,\ldots,s$ are known matrices with $m$ rows. In this paper, we show that the criterion of $D$-optimality is second-order cone representable. As a result, the method of second-order cone programming can be used to compute an approximate $D$-optimal design with any system of linear constraints on the vector of weights. More importantly, the proposed characterization allows us to compute an exact $D$-optimal design, which is possible thanks to high-quality branch-and-cut solvers specialized to solve mixed integer second-order cone programming problems. Our results extend to the case of the criterion of $D_K$-optimality, which measures the quality of $\mathbf {w}$ for the estimation of a linear parameter subsystem defined by a full-rank coefficient matrix $K$. We prove that some other widely used criteria are also second-order cone representable, for instance, the criteria of $A$-, $A_K$-, $G$- and $I$-optimality. We present several numerical examples demonstrating the efficiency and general applicability of the proposed method. We show that in many cases the mixed integer second-order cone programming approach allows us to find a provably optimal exact design, while the standard heuristics systematically miss the optimum.
description: Published at http://dx.doi.org/10.1214/15-AOS1339 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A design of a low-power open-side MPI scanner Using inverted spliced permanent magnets
Creators: name: Zhu, Tao
name: He, Jie
name: Wei, Zechen
name: Hui, Hui
name: Yang, Xin
name: Tian, Jie
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Magnetic particle imaging (MPI) is a promising imaging modality with high sensitivity, high resolution and no depth limitation. Scaled MPI scanners are developed to satisfy the demand for imaging larger imaging objects. Considering the ultimate goal of whole-body scanning, open-side MPI scanner is more suitable than traditional closed-bore MPI scanner. A fully electrically driven open-side MPI scanner have been built, enabling rotating and translating field free line (FFL) in three dimensions. However, the high power required to run the system may become a challenge when trying to scale it up. Here, we present a design of an open-side MPI device using inverted spliced permanent magnets. The design eliminates the need for power suppliers to generate and move the FFL, reducing the cooling requirements of the system. Compared to conventional solution based on permanent magnets, our solution can generate a more uniform FFL, which is essential for accurate imaging.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
title: Social media and archaeological communication: an Australian survey
Creators: name: Colley, Sarah
Publisher: name: University Library Heidelberg
Year: 2014

description: Der Beitrag diskutiert die arbeitsbezogene Nutzung von Social-Media auf der Grundlage von umfassenden Interviews, die im Jahr 2011 mit dreißig australischen Archäologen und Denkmalpflegern geführt wurden. Die meisten Interviewpartner verwenden moderierte E-Mail-Listen und Diskussionsforen und waren in unterschiedlicher Intensität z. B. in Blogs, Wikis, professionellen Netzwerken und Content-Communities aktiv. Viele der Befragten gaben an, dass sie andere sozialen Medien wie z.B. Facebook oder Twitter nicht mögen und ihren Einsatz bei der beruflichen Arbeit vermeiden. Einflussfaktoren auf die Nutzung der Social Media waren auch die Unternehmenskommunikation und Arbeitsplatzregelungen, die unterschiedliche digitale Kompetenz, Fragen der notwendigen und verfügbaren Ressourcen (Kosten, Zeit, Mühen, IT-Unterstützung) sowie ethische Fragen, die mit einigen Unternehmen und Produkten verbunden sind. Die Verwendung von anderen digitalen Techniken der Kommunikation am Arbeitsplatz, die verfügbaren Mittel und die Haltung dazu, sowie die l okale, regionale und globale Interaktionen der Interviewten wird ebenfalls untersucht. Die Ergebnisse der Studie sind relevant für die Erforschung der Auswirkungen des digitalen Wandels auf die Archäologie, die politische Ökonomie der Archäologie und auf die Praxis der Denkmalpflege.

description: The paper discusses work-related social media use based on in-depth interviews conducted in 2011 with thirty Australian archaeologists and cultural heritage professionals. Most people used moderated email lists and discussion forums and there was variable engagement with e.g. blogs, wikis, professional networking platforms and content communities. Many respondents said they disliked and avoided other social media (e.g. Facebook, Twitter) at work. Factors influencing use included corporate communication and workplace policies; different levels and kinds of digital literacy and competency; resourcing issues (cost, time, effort, ICT support) and ethics and values associated with some businesses and products. Use of other digital technology, aims of and attitudes to workplace communication and local, regional and global interactions are also discussed. The results are important for research into the impacts of digital technology on archaeology and the political economy of archaeology and cultural heritage practice.
A Recursive Sparse Grid Collocation Method for Differential Equations with White Noise
Creators: name: Zhang, Z.
name: Tretyakov, M. V.
name: Rozovskii, B.
name: Karniadakis, G. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H15 (Primary), 35R60 (Secondary), 60H40

description: We consider a sparse grid collocation method in conjunction with a time discretization of the differential equations for computing expectations of functionals of solutions to differential equations perturbed by time-dependent white noise. We first analyze the error of Smolyak's sparse grid collocation used to evaluate expectations of functionals of solutions to stochastic differential equations discretized by the Euler scheme. We show theoretically and numerically that this algorithm can have satisfactory accuracy for small magnitude of noise or small integration time, however it does not converge neither with decrease of the Euler scheme's time step size nor with increase of Smolyak's sparse grid level. Subsequently, we use this method as a building block for proposing a new algorithm by combining sparse grid collocation with a recursive procedure. This approach allows us to numerically integrate linear stochastic partial differential equations over longer times, which is illustrated in numerical tests on a stochastic advection-diffusion equation.
description: It's a minor revision of the original version
Does the Helmholtz theorem of vector decomposition apply to the wave fields of electromagnetic radiation?
Creators: name: Stewart, A. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The derivation of the Helmholtz theorem of vector decomposition of a 3-vector field requires that the field satisfy certain convergence properties at spatial infinity. This paper investigates if time-dependent electromagnetic radiation wave fields, which are of long range, satisfy these requirements. It is found that the requirements are satisfied because the fields give rise to integrals over the radial distance r of integrands of the form sin(kr)/r and cos(kr)/r. These Dirichlet integrals converge at infinity as required.
description: Version 4, 13 pages pdf. Add an appendix which describes a situation where surface integrals diverge
A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications
Creators: name: Abbate, F.
name: Possenti, A.
name: Ridolfi, A.
name: Krishnan, V. Venkatraman
name: Buchner, S.
name: Barr, E. D.
name: Bailes, M.
name: Kramer, M.
name: Cameron, A.
name: Parthasarathy, A.
name: van Straten, W.
name: Chen, W.
name: Camilo, F.
name: Padmanabh, P. V.
name: Mao, S. A.
name: Freire, P. C. C.
name: Ransom, S. M.
name: Vleeschower, L.
name: Geyer, M.
name: Zhang, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the polarization profiles of 22 pulsars in the globular cluster 47 Tucanae using observations from the MeerKAT radio telescope at UHF-band (544-1088 MHz) and report precise values of dispersion measure (DM) and rotation measure (RM). We use these measurements to investigate the presence of turbulence in electron density and magnetic fields. The structure function of DM shows a break at $\sim 30$ arcsec ($\sim 0.6$ pc at the distance of 47 Tucanae) that suggests the presence of turbulence in the gas in the cluster driven by the motion of wind-shedding stars. On the other hand, the structure function of RM does not show evidence of a break. This non-detection could be explained either by the limited number of pulsars or by the effects of the intervening gas in the Galaxy along the line of sight. Future pulsar discoveries in the cluster could help confirm the presence and localise the turbulence.
description: Accepted for publication in MNRAS, 14 pages, 6 figures
Limit Pricing and Strategic Investment
Creators: name: Brighi, L.
name: D'Amato, M.
Publisher: name: Dipartimento di Economia Marco Biagi - Università degli Studi di Modena e Reggio Emilia
Year: 2022
Subjects: subject: Entry deterrence, signalling, strategic investment, limit pricing, pooling equilibrium
subject: Entry deterrence
subject: signalling
subject: strategic investment
subject: limit pricing
subject: pooling equilibrium

description: We study an entry model where an incumbent privately informed about costs can make a cost-reducing investment choice, along with a pricing decision, in order to prevent a competing rm from entering the market. We show that if limit pricing per se can not deter pro table entry, the opportunity to undertake a strategic investment does not provide an additional instrument for the achievement of this goal to the incumbent.
The long-lasting Ascaris suum antigens in the lungs shapes the tissue adaptation modifying the pulmonary architecture and immune response after infection in mice (MATERIALS AND METHODS)
Creators: name: Fujiwara, Ricardo
name: Oliveira, Fabrício Marcus Silva
Publisher: name: figshare
Year: 2023
Subjects: Other biological sciences not elsewhere classified

description: This shared document refers to the additional information on "material and methods" contained in the paper titled (The long-lasting Ascaris suum antigens in the lungs shapes the tissue adaptation modifying the pulmonary architecture and immune response after infection in mice).
Bootstrapping the O(N) Vector Models
Creators: name: Kos, Filip
name: Poland, David
name: Simmons-Duffin, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the conformal bootstrap for 3D CFTs with O(N) global symmetry. We obtain rigorous upper bounds on the scaling dimensions of the first O(N) singlet and symmetric tensor operators appearing in the $ϕ_i \times ϕ_j$ OPE, where $ϕ_i$ is a fundamental of O(N). Comparing these bounds to previous determinations of critical exponents in the O(N) vector models, we find strong numerical evidence that the O(N) vector models saturate the bootstrap constraints at all values of N. We also compute general lower bounds on the central charge, giving numerical predictions for the values realized in the O(N) vector models. We compare our predictions to previous computations in the 1/N expansion, finding precise agreement at large values of N.
description: 26 pages, 5 figures; V2: typos corrected
title: Wolf-Dieter Becker: Das Elsbachtal: Die Landschaftsgeschichte vom Endneolithikum bis ins Hochmittelalter (Rheinische Ausgrabungen 56). Mainz 2005
Creators: name: Schreg, Rainer
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Wolf-Dieter Becker: Das Elsbachtal: Die Landschaftsgeschichte vom Endneolithikum bis ins Hochmittelalter (Rheinische Ausgrabungen 56).
Mainz: Philipp von Zabern 2005. 348 Seiten, ISBN 3-8053-3464-8, € 65,50
Synthesis of thorium and uranium in asymptotic giant branch stars
Creators: name: Choplin, A.
name: Goriely, S.
name: Siess, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The intermediate neutron capture process (i-process) operates at neutron densities between those of the slow and rapid neutron-capture processes. It can be triggered by the ingestion of protons in a convective helium-burning region. One possible astrophysical site is low-mass low-metallicity asymptotic giant branch (AGB) stars. We study here the possibility that actinides (particularly Th and U) may be significantly synthesized through i-process nucleosynthesis in AGB stars. We computed a 1 $M_{\odot}$ model at [Fe/H] $= -2.5$ with the stellar evolution code STAREVOL. We used a nuclear network of 1160 species from H to Cf coupled to the transport processes. During the proton ingestion event, the neutron density goes up to $\sim 10^{15}$ cm$^{-3}$. While most of the nuclear flow cycles in the neutron-rich Pb-Bi-Po region, a non-negligible fraction leaks towards heavier elements and eventually synthesizes actinides. The surface enrichment in Th and U is subject to nuclear and astrophysical model uncertainties that could be lowered in the future, in particular by a detailed analysis of the nuclear inputs that affect the neutron capture rates of neutron-rich isotopes between Pb and Pa. One stellar candidate that may confirm the production of actinides by the i-process is the carbon-enhanced metal-poor r/s star J0949-1617, which shows Th lines in its spectrum. Its surface abundance is shown to be reasonably well reproduced by our AGB model. Combined with cosmochronometry, this finding opens the way to dating the i-process event and thus obtaining a lower limit for the age of CEMP-r/s stars. Such a dating is expected to be accurate only if surface abundances of Th and U can be extracted simultaneously. This work shows that actinides can be synthesized in AGB stars through the i-process. As a consequence, the r-process may not be the sole mechanism for the production of U and Th.
description: 6 pages, 3 figures, accepted in A&A
Non-Markovian Dynamical Maps: Numerical Processing of Open Quantum Trajectories
Creators: name: Cerrillo, Javier
name: Cao, Jianshu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The initial stages of the evolution of an open quantum system encode the key information of its underlying dynamical correlations, which in turn can predict the trajectory at later stages. We propose a general approach based on non-Markovian dynamical maps to extract this information from the initial trajectories and compress it into non-Markovian transfer tensors. Assuming time-translational invariance, the tensors can be used to accurately and efficiently propagate the state of the system to arbitrarily long timescales. The non-Markovian Transfer Tensor Method (TTM) demonstrates the coherent-to-incoherent transition as a function of the strength of quantum dissipation and predicts the non-canonical equilibrium distribution due to the system-bath entanglement. TTM is equivalent to solving the Nakajima-Zwanzig equation, and therefore can be used to reconstruct the dynamical operators (the system Hamiltonian and memory kernel) from quantum trajectories obtained in simulations or experiments. The concept underlying the approach can be generalized to physical observables with the goal of learning and manipulating the trajectories of an open quantum system.
description: 5 pages, 4 figures
Brownian superparamagnetic nanoparticles for cell viability assessment in Magnetic Particle Imaging
Creators: name: Kuo, Renesmee
name: Saayujya, Chinmoy
name: Yeo, Kim Hwang
name: Huynh, Quincy
name: Rodrigo, Irati
name: Chandrasekharan, Prashant
name: Conolly, Steven
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Molecular imaging tools can noninvasively track cells in vivo. However, no techniques today can rapidly monitor cell therapies to allow for nimble treatment optimization for each patient, the epitome of Personalized Medicine. Magnetic Particle Imaging (MPI) is a new tracer imaging technology that could soon provide MDs unequivocal therapy treatment feedback in just three days. MPI with Brownian superparamagnetic iron oxide nanoparticles shows promise towards noninvasive sensing of cell viability via viscosity changes in apoptotic cells. This unique ability could greatly improve the efficacy of cell therapies by enabling rapid personalization of the treatment.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
VP12-03 Excitation Modes for Spin Waves in a Two-dimensional Magnetic Vortex Lattice
Creators: Payal Bhattacharjee and Saswati Barman
Publisher: name: IEEE
Year: 2025

In the flux-closure vortex state, nano- and micron-sized magnetic platelets exhibit in-plane curling magnetization and nanometer-sized perpendicularly magnetized vortex cores. Possessing the simplest nontrivial configuration, these objects are of wide interest to micromagnetics and may provide novel paths for spintronics applications. Spin wave eigen modes resulting from the magnetostatic interaction are present in vortex state structures at frequencies more than an order of magnitude higher. Using micromagnetic simulations, we looked at the spin wave modes of a two-dimensional square magnetic vortex lattice in six different lattice configurations using a sinc-function field applied in-plane and perpendicular to the disk plane. This study, therefore, provides an in-depth understanding of the collective azimuthal and radial spin-wave eigen frequencies in a two-dimensional lattice of magnetic vortices and may provide a new approach for creating a new type of magnonic crystal employing magnetic vortices arranged in a lattice.References: [1] M.-W. Yoo, J. Lee, and S.-K. Kim, Appl. Phys. Lett. 100, 172413 (2012). [2] M. Helsen, A. Gangwar, J. De Clercq, A. Vansteenkiste, M. Weigand, C. Back, B. Van Waeyenberge, Appl. Phys. Lett. 106, 032405 (2015). [3] M. Noske, H. Stoll, M. Fahnle, R. Hertel, G. Schutz, Phys. Rev. B 91, 014414 (2015).
In the flux-closure vortex state, nano- and micron-sized magnetic platelets exhibit in-plane curling magnetization and nanometer-sized perpendicularly magnetized vortex cores. Possessing the simplest nontrivial configuration, these objects are of wide interest to micromagnetics and may provide novel paths for spintronics applications. Spin wave eigen modes resulting from the magnetostatic interaction are present in vortex state structures at frequencies more than an order of magnitude higher. Using micromagnetic simulations, we looked at the spin wave modes of a two-dimensional square magnetic vortex lattice in six different lattice configurations using a sinc-function field applied in-plane and perpendicular to the disk plane. This study, therefore, provides an in-depth understanding of the collective azimuthal and radial spin-wave eigen frequencies in a two-dimensional lattice of magnetic vortices and may provide a new approach for creating a new type of magnonic crystal employing magnetic vortices arranged in a lattice.References: [1] M.-W. Yoo, J. Lee, and S.-K. Kim, Appl. Phys. Lett. 100, 172413 (2012). [2] M. Helsen, A. Gangwar, J. De Clercq, A. Vansteenkiste, M. Weigand, C. Back, B. Van Waeyenberge, Appl. Phys. Lett. 106, 032405 (2015). [3] M. Noske, H. Stoll, M. Fahnle, R. Hertel, G. Schutz, Phys. Rev. B 91, 014414 (2015).
Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. III. Grids of Isochrones for $-2.5 \le$ [Fe/H] $\le -0.5$ and Helium Abundances $Y = 0.25$ and $0.29$ at Each Metallicity
Creators: name: VandenBerg, Don A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Stellar evolutionary tracks for $0.12 \le M/M_\odot \le 1.0$ have been computed for each of several variations in the abundances of C, N, and O, assuming mass-fraction helium abundances $Y = 0.25$ and $0.29$, and 11 metallicities in the range $-1.5 \le$ [Fe/H] $\le -0.5$, in 0.2 dex increments. Such computations are provided for mixtures with [O/Fe] between $+0.4$ and $+0.8$, for different C:N:O ratios at a fixed value of [CNO/Fe], and for enhanced C. Computer codes are provided to interpolate within these grids to produce isochrones for ages $> 7$ Gyr and to generate magnitudes and colours for many broad-band filters using bolometric corrections based on MARCS model atmospheres and synthetic spectra. The models are compared with (i) similar computations produced by other workers, (ii) observed UV, optical, and IR colour-magnitude diagrams (CMDs), (iii) the effective temperatures, $(V-I_C)_0$ and $(V-K_S)_0$ colours of Pop. II stars in the solar neighbourhood, and (iv) empirical data for the absolute magnitude of the tip of the giant branch (TRGB). The isochrones are especially successful in reproducing the observed morphologies of observed CMDs and in satisfying the TRGB constraints. They also fare quite well in explaining the IR colours of low mass stars in globular clusters, indicating that they have [O/Fe] $\approx +0.6$, though some challenges remain.
description: Accepted for publication in the MNRAS; the paper consists of 20 pages, incuding 13 figures
Exponential divisor functions
Creators: name: Lelechenko, Andrew V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11N37, 11M06, 11A25

description: Consider the operator $E$ on arithmetic functions such that $Ef$ is the multiplicative arithmetic function defined by $(Ef)(p^a) = f(a)$ for every prime power $p^a$. We investigate the behaviour of $E^mτ_k$, where $τ_k$ is a $k$-dimensional divisor function and $E^m$ stands for the $m$-fold iterate of $E$. We estimate the error terms of $\sum_{n\le x} E^mτ_k(n)$ for various combinations of $m$ and $k$. We also study properties of $E^mf$ for arbitrary $f$ and sufficiently large $m$. Our study provides a unified approach to functions with exponential divisors. We improve special cases of the Dirichlet asymmetric divisor problem and several results on the exponential divisor and totient functions.
description: 13 pages
The lived experiences of South Asian immigrants accessing diabetes-related healthcare in host countries: protocol for a systematic review of qualitative studies
Creators: name: Kathiravel, Thanusha
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Medicine and Health Sciences
subject: access to health care
subject: diabetes
subject: immigrant health
subject: South Asian health

description: Protocol of a systematic literature review of the experiences of accessing health care among South Asian immigrant adults with diabetes who live in host countries
Keck Spectroscopy of the Coma Cluster Ultra-Diffuse Galaxy Y358: Dynamical Mass in a Wider Context
Creators: name: Gannon, Jonah S.
name: Forbes, Duncan A.
name: Brodie, Jean P.
name: Romanowsky, Aaron J.
name: Couch, Warrick J.
name: Ferré-Mateu, Anna
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We examine ultra-diffuse galaxies (UDGs) and their relation to non-UDGs in mass-radius-luminosity space. We begin by publishing Keck/KCWI spectroscopy for the Coma cluster UDG Y358, for which we measure both a recessional velocity and velocity dispersion. Our recessional velocity confirms association with the Coma cluster and Y358's status as a UDG. From our velocity dispersion (19 $\pm$ 3 km s$^{-1}$) we calculate a dynamical mass within the half-light radius which provides evidence for a core in Y358's dark matter halo. We compare this dynamical mass, along with those for globular cluster (GC)-rich/-poor UDGs in the literature, to mass profiles for isolated, gas-rich UDGs and UDGs in the NIHAO/FIRE simulations. We find GC-poor UDGs have dynamical masses similar to isolated, gas-rich UDGs, suggesting an evolutionary pathway may exist between the two. Conversely, GC-rich UDGs have dynamical masses too massive to be easily explained as the evolution of the isolated, gas-rich UDGs. The simulated UDGs match the dynamical masses of the GC-rich UDGs. However, once compared in stellar mass -- halo mass space, the FIRE/NIHAO simulated UDGs do not match the halo masses of either the isolated, gas-rich UDGs or the GC-rich UDGs at the same stellar mass. Finally, we supplement our data for Y358 with other UDGs that have measured velocity dispersions in the literature. We compare this sample to a wide range of non-UDGs in mass-radius-luminosity space, finding UDGs have a similar locus to non-UDGs of similar luminosity with the primary difference being their larger half-light radii.
description: 16 pages, 9 figures, accepted for publication in MNRAS
Simulation study of a magnetic particle imaging device capable of hyperthermia
Creators: name: He, Jie
name: Li, Yimeng
name: Zhu, Tao
name: Zhong, Jing
name: Hui, Hui
name: Tian, Jie
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Magnetic fluid hyperthermia (MFH) is a promising non-invasive therapy. Magnetic particle imaging (MPI) is a novel quantitative imaging technique determining the local concentration of magnetic nanoparticles with high sensitivity, and high temporal-spatial resolution. Successful implemention of MPI-guided localized MFH have been reported, which shows great potential for precision diagnosis and treatment of tumors. However, real-time 3D MPI-guided localized MFH hasn’t been reported, which is promising for understaning the the treatment process and molecular mechanism of MFH. Here, we present a proof-of-concept design of a 3D Cartesian scanning MPI device with a radiofrequency coil capable of localized MFH. A proof-of-concept simulation study is conducted to evaluate the feasibility of designed coils, designed 3D MPI mode and designed localized mode. The simultion results show the designed MPI device has the potential to realize the real-time 3D MPI-guided localized MFH.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Continuous-Time Public Good Contribution under Uncertainty: A Stochastic Control Approach
Creators: name: Ferrari, Giorgio
name: Riedel, Frank
name: Steg, Jan-Henrik
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Portfolio Management (q-fin.PM)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 93E20, 91B70, 91A15, 91A25, 60G51

description: In this paper we study continuous-time stochastic control problems with both monotone and classical controls motivated by the so-called public good contribution problem. That is the problem of n economic agents aiming to maximize their expected utility allocating initial wealth over a given time period between private consumption and irreversible contributions to increase the level of some public good. We investigate the corresponding social planner problem and the case of strategic interaction between the agents, i.e. the public good contribution game. We show existence and uniqueness of the social planner's optimal policy, we characterize it by necessary and sufficient stochastic Kuhn-Tucker conditions and we provide its expression in terms of the unique optional solution of a stochastic backward equation. Similar stochastic first order conditions prove to be very useful for studying any Nash equilibria of the public good contribution game. In the symmetric case they allow us to prove (qualitative) uniqueness of the Nash equilibrium, which we again construct as the unique optional solution of a stochastic backward equation. We finally also provide a detailed analysis of the so-called free rider effect.
description: 38 pages. This version is a revised version of the paper "Continuous-Time Public Good Contribution under Uncertainty". Added new results, improved exposition of the results and changed some proofs
Final stage of merging binaries of supermassive black holes: observational signatures
Creators: name: Wang, Jian-Min
name: Songsheng, Yu-Yang
name: Li, Yan-Rong
name: Du, Pu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: There are increasing interests in binary supermassive black holes (SMBHs), but merging binaries with separations smaller than ~1 light days (~10^2 gravitational radii for 10^8 Msun), which are rapidly evolving under control of gravitational waves, are elusive in observations. In this paper, we discuss fates of mini-disks around component SMBHs for three regimes: 1) low rates (advection-dominated accretion flows: ADAFs); 2) intermediate rates; 3) super-Eddington accretion rates. Mini-disks with intermediate rates are undergoing evaporation through thermal conduction of hot corona forming a hybrid radial structure. When the binary orbital periods are shorter than sound propagation timescales of the evaporated mini-disks, a new instability, denoted as sound instability, arises because the disks will be highly twisted so that they are destroyed. We demonstrate a critical separation of A_{crit}~10^2 Rg from the sound instability of the mini-disks and the cavity is full of hot gas. For those binaries, component SMBHs are accreting with Bondi mode in the ADAF regime, showing periodic variations resulting from Doppler boosting effects in radio from the ADAFs due to orbital motion. In the mean while, the circumbinary disks (CBDs) are still not hot enough (ultraviolet deficit) to generate photons to ionize gas for broad emission lines. For slightly super-Eddington accretion of the CBDs, MgII line appears with decreases of UV deficit, and for intermediate super-Eddington Balmer lines appear, but CIV line never unless CBD accretion rates are extremely high. Moreover, if the CBDs are misaligned with the binary plane, it is then expected to have optical periodical variations with about ten times radio periods.
description: 10 pages, 3 figures; accepted to MNRAS
Combinatorics of Link Diagrams and Volume
Creators: name: Giambrone, Adam
Publisher: name: arXiv
Year: 2013
Subjects: subject: Geometric Topology (math.GT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We show that the volumes of certain hyperbolic A-adequate links can be bounded (above and) below in terms of two diagrammatic quantities: the twist number and the number of certain alternating tangles in an A-adequate diagram. We then restrict our attention to plat closures of certain braids, a rich family of links whose volumes can be bounded in terms of the twist number alone. Furthermore, in the absence of special tangles, our volume bounds can be expressed in terms of a single stable coefficient of the colored Jones polynomial. Consequently, we are able to provide a new collection of links that satisfy a Coarse Volume Conjecture.
description: 17 pages. 15 figures
S-PLUS DR1 galaxy clusters and groups catalogue using PzWav
Creators: name: Werner, S. V.
name: Cypriano, E. S.
name: Gonzalez, A. H.
name: de Oliveira, C. Mendes
name: Araya-Araya, P.
name: Doubrawa, L.
name: de Oliveira, R. Lopes
name: Lopes, P. A. A.
name: Vitorelli, A. Z.
name: Brambila, D.
name: Costa-Duarte, M.
name: Telles, E.
name: Kanaan, A.
name: Ribeiro, T.
name: Schoenell, W.
name: Gonçalves, T. S.
name: Menéndez-Delmestre, K.
name: Bom, C. R.
name: Nakazono, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a catalogue of 4499 groups and clusters of galaxies from the first data release of the multi-filter (5 broad, 7 narrow) Southern Photometric Local Universe Survey (S-PLUS). These groups and clusters are distributed over 273 deg$^2$ in the Stripe 82 region. They are found using the PzWav algorithm, which identifies peaks in galaxy density maps that have been smoothed by a cluster scale difference-of-Gaussians kernel to isolate clusters and groups. Using a simulation-based mock catalogue, we estimate the purity and completeness of cluster detections: at S/N>3.3 we define a catalogue that is 80% pure and complete in the redshift range 0.1 10^{14}$ M$_\odot$. We also assessed the accuracy of the catalogue in terms of central positions and redshifts, finding scatter of $σ_R=12$ kpc and $σ_z=8.8 \times 10^{-3}$, respectively. Moreover, less than 1% of the sample suffers from fragmentation or overmerging. The S-PLUS cluster catalogue recovers ~80% of all known X-ray and Sunyaev-Zel'dovich selected clusters in this field. This fraction is very close to the estimated completeness, thus validating the mock data analysis and paving an efficient way to find new groups and clusters of galaxies using data from the ongoing S-PLUS project. When complete, S-PLUS will have surveyed 9300 deg$^{2}$ of the sky, representing the widest uninterrupted areas with narrow-through-broad multi-band photometry for cluster follow-up studies.
description: 17 pages, 15 figures, paper accepted for publication by MNRAS
VP23-09 Magnetic Control of Electromagnetically Induced Transparency in Slow Light Experiments
Creators: Jin Wang
Amy Krause
Publisher: name: IEEE
Year: 2025

This study investigates the influence of magnetic fields on electromagnetically induced transparency (EIT) and slow light phenomena in rubidium vapor experiments. Magnetic fields significantly impact system dynamics, influencing critical parameters including Faraday rotation, susceptibility, transmission, population distributions, and coherence. The research explores various effects of magnetic fields on coherence properties and the efficiency of EIT-based light storage mechanisms, aiming to minimize decoherence losses and enhance quantum memory device performance. Key findings highlight the necessity of comprehending magnetic effects for controlling EIT and slow light phenomena while mitigating decoherence. The study provides insights into atomic state dynamics influenced by magnetic fields, particularly in relation to interactions with control and signal fields. This research aims to develop a comprehensive model that quantifies these effects, focusing specifically on maintaining prolonged quantum coherence. These advancements are crucial for practical applications in quantum information and optical technologies, ensuring robust performance in essential domains such as quantum communication and computation.References: H. Gao, M. Rosenberry, J. Wang, and H. Batelaan, J. Phys. B, 38, 1857 (2005). G. Lindblad, Commun. Math. Phys. 48, 119 (1976). M. Fleischhauer and M. D. Lukin, Phys. Rev. Lett. 84, 5094 (2000). M. Fleischhauer and M. D. Lukin, Phys. Rev. A 65, 022314 (2002).
This study investigates the influence of magnetic fields on electromagnetically induced transparency (EIT) and slow light phenomena in rubidium vapor experiments. Magnetic fields significantly impact system dynamics, influencing critical parameters including Faraday rotation, susceptibility, transmission, population distributions, and coherence. The research explores various effects of magnetic fields on coherence properties and the efficiency of EIT-based light storage mechanisms, aiming to minimize decoherence losses and enhance quantum memory device performance. Key findings highlight the necessity of comprehending magnetic effects for controlling EIT and slow light phenomena while mitigating decoherence. The study provides insights into atomic state dynamics influenced by magnetic fields, particularly in relation to interactions with control and signal fields. This research aims to develop a comprehensive model that quantifies these effects, focusing specifically on maintaining prolonged quantum coherence. These advancements are crucial for practical applications in quantum information and optical technologies, ensuring robust performance in essential domains such as quantum communication and computation.References: H. Gao, M. Rosenberry, J. Wang, and H. Batelaan, J. Phys. B, 38, 1857 (2005). G. Lindblad, Commun. Math. Phys. 48, 119 (1976). M. Fleischhauer and M. D. Lukin, Phys. Rev. Lett. 84, 5094 (2000). M. Fleischhauer and M. D. Lukin, Phys. Rev. A 65, 022314 (2002).
The Language Question and the Diaspora
Creators: Van Dyck, Karen
Publisher: name: Columbia University
Year: 2008
Subjects: Greek language, Modern
Linguistic change
Language policy
National characteristics, Greek
Literature and society

description: Since the eighteenth century, well before independence, Greek intellectuals, school teachers, and priests have fought over which variety of the Greek language should be the official one. Which register of Greek a Greek spoke  -- and, even more importantly, wrote -- was central to what it meant to be Greek. Here I propose to shift the focus from the national to a diasporic perspective on the Language Question. I begin by rehearsing the familiar story of language reform in the service of nation building, but my primary concern will be to show that the same texts that illustrate this story also illustrate another. Many of the works written by the major figures in this debate reveal, on closer examination, that issues of nation are caught up with the question of what it means to be a Diaspora Greek. In fact, the fight for a single national language seems to be as much about diasporic multilingualism as it is about enforcing monolingualism. In my reading of texts by some of the foremost writers on the language question, Adamantios Korais, Dionysios Solomos, Psycharis (Jean Psichari), and Penelope Delta, in particular, I aim to show how much the nation’s language question has been indebted to the transnational and diasporic dimension of modern Greek culture. To read the work of these writers solely through the lens of the nation involves forgetting the multilingual and diasporic journeys that make their texts possible.
A novel method for magnetic particle optical imaging
Creators: name: Cui, Xinchao
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: A novel method for magnetic particle imaging that exploits the change in transmitted light intensity of magnetic nanoparticles in the presence of a magnetic field allows for high resolution and sensitive imaging of magnetic nanoparticles. Since the method uses direct optical imaging, the theoretical resolution is no longer governed by the properties of the material, but depends on the optical diffraction limit. In future work, it is expected that high-resolution magnetic nanoparticle imaging in vivo will be achieved by selecting wavelengths of light that have a high penetration capacity into biological tissue.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)