cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hyperbolic plasmons in massive tilted 2D Dirac materials
Creators: name: Mojarro, M. A.
name: Carrillo-Bastos, R.
name: Maytorena, Jesús A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We explore topological transitions in the type of propagation of surface electromagnetic modes in massive anisotropic tilted Dirac systems. The presence of tilting and mass gives rise to an indirect band gap that strongly modifies the joint density of states compared to the gapless system. New van Hove singularities appear, and the interplay between intra and interband transitions leads to an anisotropic optical conductivity with imaginary parts acquiring opposite signs in orthogonal directions, opening the possibility of having hyperbolic propagation of plasmons. Isofrequency contours and low plasmon losses, as obtained from the dispersion relation, show that transitions between purely anisotropic quasi-elliptical and well-defined, highly directional, hyperbolic modes are attainable only when tilt and mass coexist. Fine-tuning in the THz regime suggests that this might be useful as a dynamical probe of concurring tilt and mass in Dirac materials.
description: 6 pages, 5 figures
Magnetar XTE J1810-197: Spectro-temporal evolution of average radio emission
Creators: name: Maan, Yogesh
name: Surnis, Mayuresh P.
name: Joshi, Bhal Chandra
name: Bagchi, Manjari
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the long-term spectro-temporal evolution of the average radio emission properties of the magnetar XTE J1810-197 (PSR J1809-1943) following its most recent outburst in late 2018. We report the results from two and a half years of monitoring campaign with the upgraded Giant Metrewave Radio Telescope carried out over the frequency range of 300 - 1450 MHz. Our observations show intriguing time variability in the average profile width, flux density, spectral index and the broadband spectral shape. While the average profile width appears to gradually decrease at later epochs, the flux density shows multiple episodes of radio re-brightening over the course of our monitoring. Our systematic monitoring observations reveal that the radio spectrum has steepened over time, resulting in evolution from a magnetar-like to a more pulsar-like spectrum. A more detailed analysis reveals that the radio spectrum has a turnover, and this turnover shifts towards lower frequencies with time. We present the details of our analysis leading to these results, and discuss our findings in the context of magnetar radio emission mechanisms as well as potential manifestations of the intervening medium. We also briefly discuss whether an evolving spectral turnover could be an ubiquitous property of radio magnetars.
description: 12 pages, 6 figures, accepted for publication in ApJ
54929: A woman oiler at Bolton station in May 1917
Creators: name: Project Team, First World War Poetry Digital Archive
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: No description available.
Additional file 2 of Evaluating the impact of a trial of labor after cesarean section on labor duration: a retrospective cohort study
Creators: name: Ooba, Hikaru
name: Maki, Jota
name: Masuyama, Hisashi
Publisher: name: figshare
Year: 2024
Subjects: subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: Supplementary Material 2
Many-body localization in a quantum gas with long-range interactions and linear external potential
Creators: name: Lukin, I. V.
name: Slyusarenko, Yu. V.
name: Sotnikov, A. G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study theoretically transitions between the localized and chaotic many-body regimes in one-dimensional quantum lattice systems with long-range couplings between particles and linear external potential. In terms of established criteria characterizing localization, we construct effective phase diagrams for several types of lattice systems with variable amplitude of the external linear tilt and interaction strength. By means of exact diagonalization and time-dependent variational principle numerical approaches we analyze system dynamics after quenches. Our results reveal that the Stark localization without any artificial source of disorder remains stable upon inclusion of long-range interactions.
description: published version, 14 pages, 11 figures
Non-Markovian feedback control and acausality: an experimental study
Creators: name: Debiossac, Maxime
name: Rosinberg, Martin Luc
name: Lutz, Eric
name: Kiesel, Nikolai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Causality is an important assumption underlying nonequilibrium generalizations of the second law of thermodynamics known as fluctuation relations. We here experimentally study the nonequilibrium statistical properties of the work and of the entropy production for an optically trapped, underdamped nanoparticle continuously subjected to a time-delayed feedback control. Whereas the non-Markovian feedback depends on the past position of the particle for a forward trajectory, it depends on its future position for a time-reversed path, and is therefore acausal. In the steady-state regime, we show that the corresponding fluctuation relations in the long-time limit exhibit a clear signature of this acausality, even though the time-reversed dynamics is not physically realizable.
Axion cosmology in the presence of non-trivial Nambu-Goldstone modes
Creators: name: Yoshimura, Motohiko
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Axion cosmology is reexamined taking into account effect of kinetic pseudo Nambu-Goldstone modes, with its importance recently pointed out. When Peccei-Quinn (PQ) symmetry is broken by a chiral U(1) singlet, it is found that the effect of kinetic Nambu-Goldstone mode makes the axion dark matter untenable. When PQ symmetry is extended and is broken by two singlets, we find axion cosmology to work, but there are several differences from the axion cosmology studied in the literature. The differences are (1) ordinary type of dark matter scaling as $1/{\rm cosmic \; scale\; factor}^3$ arising from a modulus field and not from the usual angular field, (2) mass of the dark matter quantum in the ultralight range, $(10^{-32} \sim 10^{-14})\,$eV, (3) emergence of dark energy with the present density of order (a few meV)$^4$ consistent with observations, (4) presence of a long range spin-dependent force, (5) slow-roll inflation after PQ symmetry breaking when conformal coupling to gravity is introduced.
description: Revised in published form. 11 pages, 3 figures
Anticlinic order of long-range repulsive rod-like magnetic particles in 2D
Creators: name: Zheng, Xiaoyu
name: Addai, Obeng Appiagyei
name: Palffy-Muhoray, Peter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In the field of liquid crystals, it is well-known that rod-like molecules interacting via long-range attractive interactions or short-range repulsive potentials can exhibit orientational order. In this work, we are interested in what would happen to systems of rod-like particles interacting via long-range repulsive potential. In our model, each particle consists of a number of point dipoles uniformly distributed along the particle length, with all dipoles pointing along the $z-$ axis, so that the rod-like particles repel each other when they lie in the $x-y$ plane. Dipoles from different particles interact via an $r^{-3}$potential, where $r$ is the distance between the dipoles. We have considered two model systems, each with $N$ particles in a unit cell with periodic boundary conditions. In the first, particle centers are fixed on a square or triangular lattice but they are free to rotate. In the second, particles are free to translate as well as in cells with variable shapes. Here they self-assemble to form configurations where the stress tensors are isotropic. Our numerical results show that at low temperatures the particles tend to form stripes with alternating orientations, resembling herringbone patterns or the anticlinic Sm-C$_{A}$ liquid crystal phase.
description: 11 pagers, 4 figures
Topological Black Holes with curvature induced scalarization in the extended scalar-tensor theories
Creators: name: Kiorpelidi, Stella
name: Koutsoumbas, George
name: Machattou, Andri
name: Papantonopoulos, Eleftherios
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the perturbative behaviour of topological black holes in the presence of a cosmological constant and a scalar field coupled to the Gauss-Bonnet term. We calculate both analytically and numerically the quasi-normal modes of scalar perturbations in the extended scalar-tensor-Gauss-Bonnet gravity. In the case of small black holes we find a phase transition of the topological black hole to a hairy configuration.
description: 20 pages, 8 figures
Robust and Deterministic Preparation of Bosonic Logical States in a Trapped Ion
Creators: name: Matsos, V. G.
name: Valahu, C. H.
name: Navickas, T.
name: Rao, A. D.
name: Millican, M. J.
name: Kolesnikow, X. C.
name: Biercuk, M. J.
name: Tan, T. R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Encoding logical qubits in bosonic modes provides a potentially hardware-efficient implementation of fault-tolerant quantum information processing. Here, we demonstrate high-fidelity and deterministic preparation of highly non-classical bosonic states in the mechanical motion of a trapped ion. Our approach implements error-suppressing pulses through optimized dynamical modulation of laser-driven spin-motion interactions to generate the target state in a single step. We demonstrate logical fidelities for the Gottesman-Kitaev-Preskill (GKP) state as high as $\bar{\mathcal{F}}=0.940(8)$, a distance-3 binomial state with an average fidelity of $\mathcal{F}=0.807(7)$, and a 12.91(5) dB squeezed vacuum state.
description: 14 pages, 9 figures
A shortcut to adiabaticity in a cavity with a moving mirror
Creators: name: Del Grosso, Nicolás F.
name: Lombardo, Fernando C.
name: Mazzitelli, Francisco D.
name: Villar, Paula I.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Shortcuts to adiabaticity constitute a powerful alternative that speed up time-evolution while mimicking adiabatic dynamics. They are also relevant to clarify fundamental questions such as a precise quantification of the third principle of thermodynamics and quantum speed limits. In this letter we describe, for the first time, how to implement shortcuts to adiabaticity in quantum field theory, for the particular case of a massless scalar field inside a cavity with a moving wall, in 1 + 1 dimensions. The approach is based on the known solution to the problem that exploits the conformal symmetry, and the shortcuts take place whenever there is no dynamical Casimir effect. We obtain a fundamental limit for the efficiency of an Otto cycle with the quantum field as a working system, that depends on the maximum velocity that the mirror can attain. We describe possible experimental realizations of the shortcuts using superconducting circuits.
description: Published version
Pulse amplification in a closed loop $Λ$ system with permanent dipole moments
Creators: name: Daloi, Nilamoni
name: Das, Partha
name: Dey, Tarak Nath
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Propagation of a weak Gaussian probe pulse through a closed loop $Λ$ system with permanent dipole moments (PDMs) is investigated in presence of a strong control field along with a third field. The presence of PDMs allows multi photon excitation, which are otherwise forbidden. The PDMs modify the Rabi frequencies of the probe, control, and the third field inside the medium which noticeably affects the propagation of probe pulse. The probe pulse is amplified during propagation with its Gaussian shape intact. Due to unprohibited two photon excitation it is possible to amplify a probe pulse whose frequency is twice of the control field's frequency, with the help of the third field.
description: 7 pages, 6 figures
Symmetry-enforcing neural networks with applications to constitutive modeling
Creators: name: Garanger, Kévin
name: Kraus, Julie
name: Rimoli, Julian J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The use of machine learning techniques to homogenize the effective behavior of arbitrary microstructures has been shown to be not only efficient but also accurate. In a recent work, we demonstrated how to combine state-of-the-art micromechanical modeling and advanced machine learning techniques to homogenize complex microstructures exhibiting non-linear and history dependent behaviors (Logarzo et al., 2021). The resulting homogenized model, termed smart constitutive law (SCL), enables the adoption of microstructurally informed constitutive laws into finite element solvers at a fraction of the computational cost required by traditional concurrent multiscale approaches. In this work, the capabilities of SCLs are expanded via the introduction of a novel methodology that enforces material symmetries at the neuron level, applicable across various neural network architectures. This approach utilizes tensor-based features in neural networks, facilitating the concise and accurate representation of symmetry-preserving operations, and is general enough to be extend to problems beyond constitutive modeling. Details on the construction of these tensor-based neural networks and their application in learning constitutive laws are presented for both elastic and inelastic materials. The superiority of this approach over traditional neural networks is demonstrated in scenarios with limited data and strong symmetries, through comprehensive testing on various materials, including isotropic neo-Hookean materials and tensegrity lattice metamaterials. This work is concluded by a discussion on the potential of this methodology to discover symmetry bases in materials and by an outline of future research directions.
Sensing enhancement of a Fabry-Perot THz cavity using switchable VO2 mirrors
Creators: name: Papari, Gian Paolo
name: Pellegrino, Anna Lucia
name: Malandrino, Graziella
name: Andreone, Antonello
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We experimentally investigate the sensing properties of an open cavity operating in the THz regime and realized by employing as mirrors two thin vanadium dioxide (VO2) films grown on silicon parallel plates and separated by a variable length. The phase transition of VO2 is used to control the behavior of the system between two different responses: a high transmission mode to the incident radiation (VO2 in the insulating state) and a high sensitivity to tiny changes in the cavity refractive index (VO2 in the conducting state). In the first state, the low loss regime enables to adjust the cavity length and easily optimize the resonances due to the Fabry-Perot (FP) effect in the Si plates and in the cavity volume. The activation of the metallic-like state instead, by damping the FP oscillations in the plates, promotes the onset of a comb-like spectrum that can be exploited as a versatile tool for accurate sensing applications. Using both an analytical model and full-wave simulations, we estimate the device response to variation in the refractive index of the cavity volume, showing that the proposed structure can achieve sensitivity values among the highest reported for THz sensors.
Observational constraints on the deceleration parameter in a tilted universe
Creators: name: Asvesta, Kerkyra
name: Kazantzidis, Lavrentios
name: Perivolaropoulos, Leandros
name: Tsagas, Christos G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a parametrization of the deceleration parameter in a tilted universe, namely a cosmological model equipped with two families of observers. The first family follows the smooth Hubble flow, while the second are the real observers residing in a typical galaxy inside a bulk flow and moving relative to the smooth Hubble expansion with finite peculiar velocity. We use the compilation of Type Ia Supernovae (SnIa) data, as described in the Pantheon dataset, to find the quality of fit to the data and study the redshift evolution of the deceleration parameter. In so doing, we consider two alternative scenarios, assuming that the bulk-flow observers live in the $Λ$CDM and in the Einstein-de Sitter universe. We show that a tilted Einstein-de Sitter model can reproduce the recent acceleration history of the universe, without the need of a cosmological constant or dark energy, by simply taking into account linear effects of peculiar motions. By means of a Markov Chain Monte Carlo (MCMC) method, we also constrain the magnitude and the uncertainties of the parameters of the two models. From our statistical analysis, we find that the tilted Einstein-de Sitter model, equipped with one or two additional parameters that describe the assumed large-scale velocity flows, performs similar to the standard $Λ$CDM paradigm in the context of model selection criteria (Akaike Information Criterion and Bayesian Information Criterion).
description: 13 pages, 5 figures and 3 tables. Accepted for publication in MNRAS. References added, subsection added with details on the Pantheon dataset. The numerical analysis files for the reproduction of the figures can be downloaded from https://github.com/lkazantzi/tilted-cosmology
On strong growth conditions for weighted spaces of entire functions
Creators: name: Schindl, Gerhard
Publisher: name: arXiv
Year: 2024
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30D15, 30D60, 46E05, 46E15

description: We characterize the inclusion relations between weighted classes of entire functions with rapid decreasing growth and study strong growth comparison relations between given weights. In our considerations first we focus on weights defined in terms of the so-called associated weight function where the weight(system) is based on a given sequence. Then the abstract weight function case is reduced to the weight sequence setting by using the so-called associated weight sequence. Finally, we compare weighted entire function spaces defined in terms of so-called dilatation-type and exponential-type weight systems.
description: 30 pages; this is the second part of the first version of submission arXiv:2211.14374. The proofs of Prop. 4.7 & 4.12, and hence of Cor. 4.14, in the first part contain a technical gap; in the appendix of this paper we provide a correction. Some stylistic changes according to the suggestions by the anonymous referee have been applied; this version is published in Bull. Sci. math
Structural and Magnetic Properties of Fe-Al alloys: an Ab initio Studies
Creators: name: Zagrebin, Mikhail A.
name: Matyunina, Mariya V.
name: Koshkin, Alexey B.
name: Sokolovskiy, Vladimir V.
name: Buchelnikov, Vasiliy D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the framework of density functional theory, the structural and magnetic properties of Fe$_{100-x}$Al$_x$ alloys (${5 \leq x \leq 25}$~at.\%) with the different structural order are investigated. Using the Korringa-Kohn-Rostoker Green's function method with a coherent potential approximation, the equilibrium lattice parameters, ground-state energy, and shear moduli for D0$_3$, B2, and A2 structures are calculated. For all structures, the optimized lattice constant increases while the shear modulus demonstrates a decreasing behavior with increasing Al content. The tetragonal magnetostriction constants are estimated by the torque method. The A2 and B2 structures provide a positive contribution to the tetragonal magnetostriction. With the help of Monte Carlo simulations of the Heisenberg model, the Curie temperatures are obtained in a wide concentration range.
Angular momentum and generalized parton distributions for the proton with basis light-front quantization
Creators: name: Liu, Yiping
name: Xu, Siqi
name: Mondal, Chandan
name: Zhao, Xingbo
name: Vary, James P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the unpolarized and the helicity dependent generalized parton distributions (GPDs) for the valence quarks of the proton in both momentum space and position space within the basis light-front quantization (BLFQ) framework. The GPDs for the valence quarks are computed from the eigenvectors of a light-front effective Hamiltonian in the valence Fock sector consisting of a three-dimensional confinement potential and a one-gluon exchange interaction with fixed coupling. Employing these GPDs, we obtain the spatial distributions of quark angular momentum inside the proton. In our BLFQ approach, we explore various definitions of angular momentum density and illustrate the differences between them arising from terms that integrate to zero. We also discuss the flavor contributions to the quark angular momentum densities.
description: 14 pages, 4 figures
Stuck-at Faults in ReRAM Neuromorphic Circuit Array and their Correction through Machine Learning
Creators: name: Sawal, Vedant
name: Wong, Hiu Yung
Publisher: name: arXiv
Year: 2024
Subjects: subject: Hardware Architecture (cs.AR)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: In this paper, we study the inference accuracy of the Resistive Random Access Memory (ReRAM) neuromorphic circuit due to stuck-at faults (stuck-on, stuck-off, and stuck at a certain resistive value). A simulation framework using Python is used to perform supervised machine learning (neural network with 3 hidden layers, 1 input layer, and 1 output layer) of handwritten digits and construct a corresponding fully analog neuromorphic circuit (4 synaptic arrays) simulated by Spectre. A generic 45nm Process Development Kit (PDK) was used. We study the difference in the inference accuracy degradation due to stuck-on and stuck-off defects. Various defect patterns are studied including circular, ring, row, column, and circular-complement defects. It is found that stuck-on and stuck-off defects have a similar effect on inference accuracy. However, it is also found that if there is a spatial defect variation across the columns, the inference accuracy may be degraded significantly. We also propose a machine learning (ML) strategy to recover the inference accuracy degradation due to stuck-at faults. The inference accuracy is improved from 48% to 85% in a defective neuromorphic circuit.
Importance of accurate consideration of the electron inertia in hybrid-kinetic simulations of collisionless plasma turbulence: 1. The 2D limit
Creators: name: Jain, Neeraj
name: Muñoz, Patricio
name: Tabriz, Meisam Farzalipour
name: Rampp, Markus
name: Büchner, Jörg
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The dissipation mechanism of the magnetic energy in turbulent collisionless space and astrophysical plasmas is still not well understood. Its investigation requires efficient kinetic simulations of the energy transfer in collisionless plasma turbulence. In this respect, hybrid-kinetic simulations, in which ions are treated as particles and electrons as an inertial fluid, have begun to attract a significant interest recently. Hybrid-kinetic models describe both ion- and electron scale processes by ignoring electron kinetic effects so that they are computationally much less demanding compared to fully kinetic plasma models. Hybrid-kinetic codes solve either the Vlasov equation for the ions (Eulerian Vlasov-hybrid codes) or the equations of motion of the ions as macro-particles (Lagrangian Particle-in-Cell (PIC)-hybrid codes). They consider the inertia of the electron fluid using different approximations. We check the validity of these approximations by employing our recently massively parallelized three-dimensional PIC-hybrid code CHIEF which considers the electron inertia without any of the common approximations. In particular we report the results of simulations of two-dimensional collisionless plasma turbulence. We conclude that the simulation results obtained using hybrid-kinetic codes which use approximations to describe the electron inertia need to be interpreted with caution. We also discuss the parallel scalability of CHIEF, to the best of our knowledge, the first PIC-hybrid code which without approximations describes the inertial electron fluid.
description: 9 figures, submitted
Quantum tunneling in graphene Corbino disk in a solenoid magnetic potential with wedge disclination
Creators: name: Bouhlal, Ahmed
name: Jellal, Ahmed
name: Mansouri, Mohamed
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the wedge disclination effect on quantum tunneling of a Corbino disk in gapped-graphene of inner $R_1$ and outer $R_2$ radii in the presence of magnetic flux $Φ_i$. We solve Dirac equation for different regions and obtain the solutions of energy spectrum in terms of Hankel functions. The asymptotic behaviors for large arguments allow us to determine the transmission, Fano factor and conductance. We establish the case where the crystal symmetry is modified locally by replacing a hexagon by pentagon, square, heptagon or octagon. We show that the wedge disclination $n$ modifies the amplitude of transmission oscillations. We find that the period of Fano factor oscillations is of the Aharonov-Bohm type, which strongly depends on $n$ where intense peaks are observed. As another result, $n$ changes the minimum and period of conductance oscillations of the Aharonov-Bohm type. We show that $n$ minimizes the effect of resonance and decreases the amplitude of conductance magnitude $ΔG$ oscillations.
description: 8 pages, 10 figures, two columns
sj-docx-2-eeg-10.1177_15500594221103834 - Supplemental material for Changes in Electrical Brain Activity and Cognitive Functions Following Mild to Moderate COVID-19: A one-Year Prospective Study After Acute Infection
Creators: name: Andrei Appelt, Pablo
name: Taciana Sisconetto, Angélica
name: Baldo Sucupira, Kelly Savana Minaré
name: Neto, Eduardo de Moura
name: Chagas, Tatiane de Jesus
name: Bazan, Rodrigo
name: Moura Cabral, Ariana
name: Andrade, Adriano de Oliveira
name: de Souza, Luciane Aparecida Pascucci Sande
name: José Luvizutto, Gustavo
Publisher: name: SAGE Journals
Year: 2022
Subjects: subject: 110904 Neurology and Neuromuscular Diseases
subject: FOS: Clinical medicine
subject: Neuroscience

description: Supplemental material, sj-docx-2-eeg-10.1177_15500594221103834 for Changes in Electrical Brain Activity and Cognitive Functions Following Mild to Moderate COVID-19: A one-Year Prospective Study After Acute Infection by Pablo Andrei Appelt, Angélica Taciana Sisconetto, Kelly Savana Minaré Baldo Sucupira, Eduardo de Moura Neto, Tatiane de Jesus Chagas, Rodrigo Bazan, Ariana Moura Cabral, Adriano de Oliveira Andrade, Luciane Aparecida Pascucci Sande de Souza and Gustavo José Luvizutto in Clinical EEG and Neuroscience
Generalization of the Tavis-Cummings model for multi-level anharmonic systems: insights on the second excitation manifold
Creators: name: Campos-Gonzalez-Angulo, Jorge A.
name: Yuen-Zhou, Joel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Confined electromagnetic modes strongly couple to collective excitations in ensembles of quantum emitters, producing light-matter hybrid states known as polaritons. Under such conditions, the discrete multilevel spectrum of molecular systems offers an appealing playground for exploring multiphoton processes. This work contrasts predictions from the Tavis-Cummings (TC) model, in which the material is a collection of two-level systems, with the implications of considering additional energy levels with harmonic and anharmonic structures. We discuss the exact eigenspectrum, up to the second excitation manifold, of an arbitrary number $N$ of oscillators collectively coupled to a single cavity mode in the rotating-wave approximation. Elaborating on our group-theoretic approach [New J. Phys. 23, 063081 (2021)], we simplify the brute-force diagonalization of a gigantic $N^2\times N^2$ Hamiltonian (where $N=10^6-10^{10}$, as experiments suggest) to the diagonalization of, at most, $4\times4$ matrices. We thoroughly discuss the eigenstates and the consequences of weak and strong anharmonicities. Furthermore, we find resonant conditions between bipolaritons and anharmonic transitions where two-photon absorption can be enhanced. Finally, we conclude that energy shifts in the polaritonic states induced by anharmonicities become negligible for large $N$. Thus, calculations with a single or few emitters qualitatively fail to represent the nonlinear optical response of the collective strong coupling regime. Our work highlights the rich physics of multilevel anharmonic systems coupled to cavities absent in standard models of quantum optics. We also provide concise tabulated expressions for eigenfrequencies and transition amplitudes, which should serve as a reference for future spectroscopic studies of molecular polaritons.
description: 15 pages, 6 figures
Active Control of Bound States in the Continuum in Toroidal Metasurfaces
Creators: name: Kovalev, Fedor V.
name: Miroshnichenko, Andrey E.
name: Basharin, Alexey A.
name: Toepfer, Hannes
name: Shadrivov, Ilya V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The remarkable properties of toroidal metasurfaces, featuring ultrahigh-Q bound states in the continuum (BIC) resonances and nonradiating anapole modes, have garnered significant attention. The active manipulation of quasi-BIC resonance characteristics offers substantial potential for advancing tunable metasurfaces. Our study explores explicitly the application of vanadium dioxide, a phase change material widely used in active photonics and room-temperature bolometric detectors, to control quasi-BIC resonances in toroidal metasurfaces. The phase change transition of vanadium dioxide occurs in a narrow temperature range, providing a large variation in material resistivity. Through heating thin film patches of vanadium dioxide integrated into a metasurface comprising gold split-ring resonators on a sapphire substrate, we achieve remarkable control over the amplitude and frequency of quasi-BIC resonances due to their high sensitivity to losses present in the system. Breaking the symmetry of meta-atoms reveals enhanced tunability. The predicted maximum change in the quasi-BIC resonance amplitude reaches 14 dB with a temperature variation of approximately 10 °C.
description: Submitted to Advanced Photonics Research
Knowledge Engineering in the Language Model Era
Creators: name: Groth, Paul
Publisher: name: Zenodo
Year: 2023
Subjects: Language Models
LM
Large Language Models
LLM
Prompt engineering

description: In this talk, I contend that the emergence of large language models (LLMs) (e.g. GPT3, T5) as both a source of knowledge and an an effective tool for extracting knowledge provides new opportunities for knowledge engineering. First, by helping to address the cost knowledge acquisition, LLMs let us focus on other aspects of knowledge engineering - understanding the user, ensuring that the knowledge production lifecycle is reliable, dealing with curation. Second, the accessibility of LLMs means that more people could benefit from knowledge engineering practices. This raises the question of how to disseminate those practices. Here, I take the example of prompt engineering.
Lost in translation: the Abelian affine connection (in the coincident gauge)
Creators: name: Jiménez, Jose Beltrán
name: Koivisto, Tomi S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The simplest i.e. the Abelian i.e. the commutative i.e. the integrable i.e. the flat and torsion-free i.e. the symmetric teleparallel affine connection has been considered in many recent works in the literature. Such an affine connection is characterised by the property that it can be vanished by a general coordinate transformation, by fixing the so called coincident gauge. This article focuses on the subtleties involved in the applications of the coincident gauge.
description: 11 pages, no figues; Contribution to the Special Issue of the International Journal of Geometric Methods in Modern Physics dedicated to the conference Geometric Foundations of Gravity 2021
An Integrated Usability Framework for Evaluating Open Government Data Portals: Comparative Analysis of EU and GCC Countries
Creators: name: Molodtsov, Fillip
name: Nikiforova, Anastasija
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: This study explores the critical role of open government data (OGD) portals in fostering transparency and collaboration between diverse stakeholders. Recognizing the challenges of usability, communication with diverse populations, and strategic value creation, this paper develops an integrated framework for evaluating OGD portal effectiveness that accommodates user diversity (regardless of their data literacy and language), evaluates collaboration and participation, and the ability of users to explore and understand the data provided through them. The framework is validated by applying it to 33 national portals across European Union and Gulf Cooperation Council (GCC) countries, as a result of which we rank OGD portals, identify some good practices that lower-performing portals can learn from, and common shortcomings. Notably, the study unveils the competitive and innovative nature of GCC OGD portals, pinpointing specific improvement areas such as multilingual support and data understandability. The findings underscore the growing trend of exposing data quality metrics and advocate for enhanced two-way communication channels between users and portal representatives. Overall, the study contributes to accelerating the development of user-friendly, collaborative, and sustainable OGD portals while addressing gaps identified in previous research.
description: This paper has been accepted for publication in Proceedings of the 25th Annual International Conference on Digital Government Research and this is a preprint version of the manuscript
Visual Inertial Odometry using Focal Plane Binary Features (BIT-VIO)
Creators: name: Lisondra, Matthew
name: Kim, Junseo
name: Murai, Riku
name: Zareinia, Kourosh
name: Saeedi, Sajad
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Focal-Plane Sensor-Processor Arrays (FPSP)s are an emerging technology that can execute vision algorithms directly on the image sensor. Unlike conventional cameras, FPSPs perform computation on the image plane -- at individual pixels -- enabling high frame rate image processing while consuming low power, making them ideal for mobile robotics. FPSPs, such as the SCAMP-5, use parallel processing and are based on the Single Instruction Multiple Data (SIMD) paradigm. In this paper, we present BIT-VIO, the first Visual Inertial Odometry (VIO) which utilises SCAMP-5.BIT-VIO is a loosely-coupled iterated Extended Kalman Filter (iEKF) which fuses together the visual odometry running fast at 300 FPS with predictions from 400 Hz IMU measurements to provide accurate and smooth trajectories.
description: Accepted for Presentation Yokohama, Japan for IEEE 2024 ICRA
Exploring Estonia's Open Government Data Development as a Journey towards Excellence: Unveiling the Progress of Local Governments in Open Data Provision
Creators: name: Rajamäe-Soosaar, Katrin
name: Nikiforova, Anastasija
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Databases (cs.DB)
subject: Software Engineering (cs.SE)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Estonia has a global reputation of a digital state or e-country. However, despite the success in digital governance, the country has faced challenges in the realm of Open Government Data (OGD) area, with significant advancements in its OGD ecosystem, as reflected in various open data rankings from 2020 and onwards, in the recent years being recognized among trend-setters. This paper aims to explore the evolution and positioning of Estonia's OGD development, encompassing national and local levels, through an integrated analysis of various indices, primary data from the Estonian OGD portal, and a thorough literature review. The research shows that Estonia has made progress in the national level open data ecosystem, primarily due to improvements in the OGD portal usability and legislation amendments. However, the local level is not as developed, with local governments lagging behind in OGD provision. The literature review highlights the lack of previous research focusing on Estonian and European local open data, emphasizing the need for future studies to explore the barriers and enablers of municipal OGD. This study contributes to a nuanced understanding of Estonia's dynamic journey in the OGD landscape, shedding light on both achievements and areas warranting further attention for establishing a sustainable open data ecosystem.
description: This paper has been accepted for publication in Proceedings of the 25th Annual International Conference on Digital Government Research and this is a pre-print version of the manuscript. It is posted here for your personal use. Not for redistribution
Otimização de Armazenamento de Imagens com Base64 para Registro Permanente em Block Chain
Creators: name: Pacheco HArley
Publisher: name: Zenodo
Year: 2024

description: This project explores the inclusion of images in the blockchain, highlighting the use of compact QR codes as an innovative solution for storing visual data in a decentralized network. We began with 5x5 pixel images and progressed to 20x20 pixel QR codes, with the potential to reach up to 30x30 pixels. The study analyzes encoding techniques such as Base64, Base85, and Base256, emphasizing the importance of maintaining human readability. We conclude that this approach offers significant potential, but further research is needed to optimize and expand its applications.Este projeto explora a inclusão de imagens na blockchain, destacando o uso de QR codes compactos como uma solução inovadora para o armazenamento de dados visuais em uma rede descentralizada. Iniciamos com imagens de 5x5 pixels e evoluímos para QR codes de 20x20 pixels, com a possibilidade de alcançar até 30x30 pixels. O estudo analisa técnicas de codificação como Base64, Base85, e Base256, e destaca a importância de manter a legibilidade para humanos. Concluímos que essa abordagem oferece grande potencial, mas mais pesquisas são necessárias para otimizar e expandir suas aplicações.
title: Sy magre son devenus (Linker 265, 1603)
Creators: name: Santini, Giovanna
Publisher: name: Francigena
Year: 2018
Subjects: pellegrinaggio,canto d’itinerario,via francigena, pilgrimage,route song

description: Si propone una nuova edizione del componimento anonimo Sy magre son devenus, un “canto d’itinerario” in cui si descrive in prima persona l’esperienza di viaggio di un pellegrino diretto
a Roma. Rispetto alle precedenti edizioni, si apportano alcune correzioni utili a riconoscere il significato letterale e complessivo del testo, tradotto e commentato dal punto di vista storico, linguistico e filologico. This article proposes a new edition of the anonymous poem Sy magre son devenus, a “route song”
that narrates in the first person a pilgrim’s journey to Rome. Some corrections are made with respect to previous editions, which are useful for recognizing the literal and general meaning of the text. The edition is translated and commented from historical, linguistic, and philological
points of view.
Hyperboloidal method for frequency-domain self-force calculations
Creators: name: Macedo, Rodrigo Panosso
name: Leather, Benjamin
name: Warburton, Niels
name: Wardell, Barry
name: Zenginoğlu, Anıl
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational self-force theory is the leading approach for modeling gravitational wave emission from small mass-ratio compact binaries. This method perturbatively expands the metric of the binary in powers of the mass ratio. The source for the perturbations depends on the orbital configuration, calculational approach, and the order of the perturbative expansion. These sources fall into three broad classes: (i) distributional, (ii) worldtube, and (iii) unbounded support. The latter, in particular, is important for emerging second-order (in the mass ratio) calculations. Traditional frequency domain approaches employ the variation of parameters method and compute the perturbation on standard time slices with numerical boundary conditions supplied at finite radius from series expansions of the asymptotic behavior. This approach has been very successful, but the boundary conditions calculations are tedious, and the approach is not well suited to unbounded sources where homogeneous solutions must be computed at all radii. This work develops an alternative approach where hyperboloidal slices foliate the spacetime, and compactifying coordinates simplify the boundary treatment. We implement this approach with a multi-domain spectral solver with analytic mesh refinement and use the scalar-field self-force on circular orbits around a Schwarzschild black hole as an example problem. The method works efficiently for all three source classes encountered in self-force calculations and has distinct advantages over the traditional approach. For example, our code efficiently computes the perturbation for orbits with extremely large orbital radii ($r_{p}>10^5M$) or modes with very high spherical harmonic mode index ($\ell \ge 100$). Our results indicate that hyperboloidal methods can play an essential role in self-force calculations.
description: 25 pages, 19 figures; updated to reflect published version
Supplemental Material - Albumin versus balanced crystalloid for resuscitation in the treatment of sepsis: A protocol for a randomised controlled feasibility study, “ABC-Sepsis”
Creators: name: Cafferkey, John
name: Ferguson, Andrew
name: Grahamslaw, Julia
name: Oatey, Katherine
name: Norrie, John
name: Lone, Nazir
name: Walsh, Timothy
name: Horner, Daniel
name: Appelboam, Andy
name: Hall, Peter
name: Skipworth, Richard
name: Bell, Derek
name: Rooney, Kevin
name: Shankar-Hari, Manu
name: Corfield, Alasdair
name: Gray, Alasdair
Publisher: name: SAGE Journals
Year: 2022
Subjects: Health and Community Services
Cardiology
Emergency Medicine
Surgery

description: Supplemental Material for Albumin versus balanced crystalloid for resuscitation in the treatment of sepsis: A protocol for a randomised controlled feasibility study, “ABC-Sepsis” by John Cafferkey, Andrew Ferguson, Julia Grahamslaw, Katherine Oatey, John Norrie, Timothy Walsh, Nazir Lone, Daniel Horner, Andy Appelboam, Peter Hall, Richard Skipworth, Derek Bell, Kevin Rooney, Manu Shankar-Hari, Alasdair Corfield and Alasdair Gray in Journal of the Intensive Care Society
A quantum information theoretic analysis of reinforcement learning-assisted quantum architecture search
Creators: name: Sadhu, Abhishek
name: Sarkar, Aritra
name: Kundu, Akash
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the field of quantum computing, variational quantum algorithms (VQAs) represent a pivotal category of quantum solutions across a broad spectrum of applications. These algorithms demonstrate significant potential for realising quantum computational advantage. A fundamental aspect of VQAs involves formulating expressive and efficient quantum circuits (namely ansatz), and automating the search of such ansatz is known as quantum architecture search (QAS). Recently, reinforcement learning (RL) techniques is utilized to automate the search for ansatzes, known as RL-QAS. This study investigates RL-QAS for crafting ansatz tailored to the variational quantum state diagonalisation problem. Our investigation includes a comprehensive analysis of various dimensions, such as the entanglement thresholds of the resultant states, the impact of initial conditions on the performance of RL-agent, the phase transition behaviour of correlation in concurrence bounds, and the discrete contributions of qubits in deducing eigenvalues through conditional entropy metrics. We leverage these insights to devise an entanglement-guided admissible ansatz in QAS to diagonalise random quantum states using optimal resources. Furthermore, the methodologies presented herein offer a generalised framework for constructing reward functions within RL-QAS applicable to variational quantum algorithms.
description: Published version