cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Conic geometric optimisation on the manifold of positive definite matrices
Creators: name: Sra, Suvrit
name: Hosseini, Reshad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We develop \emph{geometric optimisation} on the manifold of Hermitian positive definite (HPD) matrices. In particular, we consider optimising two types of cost functions: (i) geodesically convex (g-convex); and (ii) log-nonexpansive (LN). G-convex functions are nonconvex in the usual euclidean sense, but convex along the manifold and thus allow global optimisation. LN functions may fail to be even g-convex, but still remain globally optimisable due to their special structure. We develop theoretical tools to recognise and generate g-convex functions as well as cone theoretic fixed-point optimisation algorithms. We illustrate our techniques by applying them to maximum-likelihood parameter estimation for elliptically contoured distributions (a rich class that substantially generalises the multivariate normal distribution). We compare our fixed-point algorithms with sophisticated manifold optimisation methods and obtain notable speedups.
description: 27 pages; updated version with simplified presentation; 7 figures
Squeezed superradiance enables robust entanglement-enhanced metrology even with highly imperfect readout
Creators: name: Koppenhöfer, Martin
name: Groszkowski, Peter
name: Clerk, A. A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum metrology protocols using entangled states of large spin ensembles attempt to achieve measurement sensitivities surpassing the standard quantum limit (SQL), but in many cases they are severely limited by even small amounts of technical noise associated with imperfect sensor readout. Amplification strategies based on time-reversed coherent spin-squeezing dynamics have been devised to mitigate this issue, but are unfortunately very sensitive to dissipation, requiring a large single-spin cooperativity to be effective. Here, we propose a new dissipative protocol that combines amplification and squeezed fluctuations. It enables the use of entangled spin states for sensing well beyond the SQL even in the presence of significant readout noise. Further, it has a strong resilience against undesired single-spin dissipation, requiring only a large collective cooperativity to be effective.
description: 6+9 pages, 3+3 figures; equivalent to published version; a reference to a previously unpublished manuscript has been updated
Multi-bounce resonances in the interaction of walking droplets
Creators: name: Zhang, George
name: Christov, Ivan C.
name: Rahman, Aminur
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Dynamical Systems (math.DS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37xx, 76B15, 70Kxx

description: Discrete dynamical models of walking droplets ("walkers") have allowed swift numerical experiments revealing heretofore unobserved quantum statistics and related behaviors in a classical hydrodynamic system. We present evidence that one such model of walking droplets exhibits the empirically elusive $n$-bounce resonances that are traditionally seen in the scattering of solitary waves governed by covariant nonlinear field theories with polynomial self-interaction. A numerical investigation of the chosen model of interacting walking droplets reveals a fractal structure of resonances in the velocity in--velocity out diagram, much like the usual maps constructed for collisions of solitary waves. We suggest avenues for further theoretical analysis of walker collisions, which may connect this discrete model to the field-theoretic setting, as well as directions towards new experimental realizations $n$-bounce resonances.
description: 13 pages, 5 figures. v2: minor updates, accepted for publication in a Special Issue of Mechanics Research Communications. This paper is dedicated to the memory of our friend, mentor, and colleague, Denis Blackmore. Sk\r{a}l
Symmetries of the Three Gap Theorem
Creators: name: Dasgupta, Aneesh
name: Roeder, Roland
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 11K06, 11J71, 37A44

description: The Three Gap Theorem states that for any $α\in \mathbb{R}$ and $N \in \mathbb{N}$, the fractional parts of $\{ 0α, 1α, \dots, (N - 1)α\}$ partition the unit circle into gaps of at most three distinct lengths. We prove a result about symmetries in the order with which the sizes of gaps appear on the circle.
description: To appear in The American Math Monthly. This is the author's original manuscript (AOM), and this version does not include several improvements that took place due to the refereeing process. Comments welcome!
Asymptotic linear bounds of Castelnuovo-Mumford regularity in multigraded modules
Creators: name: Ghosh, Dipankar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: Primary 13E05, 13D45, 13A02

description: Let $A$ be a Noetherian standard $\mathbb{N}$-graded algebra over an Artinian local ring $A_0$. Let $I_1,\ldots,I_t$ be homogeneous ideals of $A$ and $M$ a finitely generated $\mathbb{N}$-graded $A$-module. We prove that there exist two integers $k$ and $k'$ such that \[ \mathrm{reg}(I_1^{n_1} \cdots I_t^{n_t} M) \leq (n_1 + \cdots + n_t) k + k' \quad\mbox{for all }~n_1,\ldots,n_t \in \mathbb{N}. \]
description: 9 pages
MPEC 2023-L28 : 2023 DP5
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 DP5

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Scrambling is Necessary but Not Sufficient for Chaos
Creators: name: Dowling, Neil
name: Kos, Pavel
name: Modi, Kavan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We show that out-of-time-order correlators (OTOCs) constitute a probe for Local-Operator Entanglement (LOE). There is strong evidence that a volumetric growth of LOE is a faithful dynamical indicator of quantum chaos, while OTOC decay corresponds to operator scrambling, often conflated with chaos. We show that rapid OTOC decay is a necessary but not sufficient condition for linear (chaotic) growth of the LOE entropy. We analytically support our results through wide classes of local-circuit models of many-body dynamics, including both integrable and non-integrable dual-unitary circuits. We show sufficient conditions under which local dynamics leads to an equivalence of scrambling and chaos.
description: 6+16 Pages. Comments welcome
Lithium-ion Battery Online Knee Onset Detection by Matrix Profile
Creators: name: Zhou, Kate Qi
name: Qin, Yan
name: Yuen, Chau
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Lithium-ion batteries (LiBs) degrade slightly until the knee onset, after which the deterioration accelerates to end of life (EOL). The knee onset, which marks the initiation of the accelerated degradation rate, is crucial in providing an early warning of the battery's performance changes. However, there is only limited literature on online knee onset identification. Furthermore, it is good to perform such identification using easily collected measurements. To solve these challenges, an online knee onset identification method is developed by exploiting the temporal information within the discharge data. First, the temporal dynamics embedded in the discharge voltage cycles from the slight degradation stage are extracted by the dynamic time warping. Second, the anomaly is exposed by Matrix Profile during subsequence similarity search. The knee onset is detected when the temporal dynamics of the new cycle exceed the control limit and the profile index indicates a change in regime. Finally, the identified knee onset is utilized to categorize the battery into long-range or short-range categories by its strong correlation with the battery's EOL cycles. With the support of the battery categorization and the training data acquired under the same statistic distribution, the proposed SOH estimation model achieves enhanced estimation results with a root mean squared error as low as 0.22%.
Formation energy of intrinsic defects in silicon from the Galitskii-Migdal formula
Creators: name: Matsko, N. L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The work is devoted to the formation energy calculations of intrinsic defects in silicon based on the GW method and the Galitskii-Migdal formula. The two methods for calculating the electronic response function are applied. The first one uses direct integration over frequency to determine the response function. The diagonal form of the spectral function is the only assumption within the RPA framework, but the supercell calculations are very time-consuming. Therefore, we propose the method in which the response function is calculated in the plasmon pole approximation, and the GW contribution to the exchange-correlation energy is taken with a certain mixing constant. The value of the constant is found from the correspondence with experimental data. This makes it possible to obtain an accuracy comparable to the first method at significantly lower computational costs. The described method is used to calculate the formation energy of the neutral self-interstitial, vacancy and two divacansy structures in supercells of 214-217 silicon atoms.
Stripe to spot transition in a plant root hair initiation model
Creators: name: Breña-Medina, V. F.
name: Avitabile, D.
name: Champneys, A. R.
name: Ward, M. J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A generalised Schnakenberg reaction-diffusion system with source and loss terms and a spatially dependent coefficient of the nonlinear term is studied both numerically and analytically in two spatial dimensions. The system has been proposed as a model of hair initiation in the epidermal cells of plant roots. Specifically the model captures the kinetics of a small G-protein ROP, which can occur in active and inactive forms, and whose activation is believed to be mediated by a gradient of the plant hormone auxin. Here the model is made more realistic with the inclusion of a transverse co-ordinate. Localised stripe-like solutions of active ROP occur for high enough total auxin concentration and lie on a complex bifurcation diagram of single and multi-pulse solutions. Transverse stability computations, confirmed by numerical simulation show that, apart from a boundary stripe, these 1D solutions typically undergo a transverse instability into spots. The spots so formed typically drift and undergo secondary instabilities such as spot replication. A novel 2D numerical continuation analysis is performed that shows the various stable hybrid spot-like states can coexist. The parameter values studied lead to a natural singularly perturbed, so-called semi-strong interaction regime. This scaling enables an analytical explanation of the initial instability, by describing the dispersion relation of a certain non-local eigenvalue problem. The analytical results are found to agree favourably with the numerics. Possible biological implications of the results are discussed.
description: 28 pages, 44 figures
Additional file 4 of Factors influencing conveyance of older adults with minor head injury by paramedics to the emergency department: a multiple methods study
Creators: name: Nicholson, Helen
name: Voss, Sarah
name: Black, Sarah
name: Taylor, Hazel
name: Williams, David
name: Benger, Jonathan
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 4. Consequence factors influencing conveyance ofolder adults with minor head injury by paramedics.
Gamma classes and quantum cohomology of Fano manifolds: Gamma conjectures
Creators: name: Galkin, Sergey
name: Golyshev, Vasily
name: Iritani, Hiroshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: Classical Analysis and ODEs (math.CA)
subject: Number Theory (math.NT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: We propose Gamma Conjectures for Fano manifolds which can be thought of as a square root of the index theorem. Studying the exponential asymptotics of solutions to the quantum differential equation, we associate a principal asymptotic class A_F to a Fano manifold F. We say that F satisfies Gamma Conjecture I if A_F equals the Gamma class G_F. When the quantum cohomology of F is semisimple, we say that F satisfies Gamma Conjecture II if the columns of the central connection matrix of the quantum cohomology are formed by G_F Ch(E_i) for an exceptional collection {E_i} in the derived category of coherent sheaves D^b_coh(F). Gamma Conjecture II refines part (3) of Dubrovin's conjecture. We prove Gamma Conjectures for projective spaces and Grassmannians.
description: 56 pages, 11 figures, v2: references added, some proofs simplified and shortened; Property O introduced; the discussion on Gamma conjecture for toric manifolds/toric complete intersections and the compatibility with quantum Lefschetz has been removed and appears in arXiv:1508.00719, v3: a rigorous definition of mutation of marked reflection systems given in 4.3, v4: minor changes
José Carlos Goncalves Peixoto, Pensamento Social e Pedagógico de D. Frei Caetano Brandão, Braga 1991, 173 pp., 230X160.
Creators: name: Pereira, José Dias
Publisher: name: Theologica
Year: 1994

description: Theologica, v. 29 n. 2 (1994): Santuários marianos | Braga e Viana do Castelo
The symplectic displacement energy
Creators: name: Banyaga, Augustin
name: Hurtubise, David E.
name: Spaeth, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D35, 57R17

description: We define the symplectic displacement energy of a non-empty subset of a compact symplectic manifold as the infimum of the Hofer-like norm [5] of symplectic diffeomorphisms that displace the set. We show that this energy (like the usual displacement energy defined using Hamiltonian diffeomorphisms) is a strictly positive number on sets with non-empty interior. As a consequence we prove a result justifying the introduction of the notion of strong symplectic homeomorphisms [4].
description: 15 pages, 1 figure
The Gaia FGK Benchmark Stars - High resolution spectral library
Creators: name: Blanco-Cuaresma, S.
name: Soubiran, C.
name: Jofré, P.
name: Heiter, U.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. An increasing number of high resolution stellar spectra is available today thanks to many past and ongoing spectroscopic surveys. Consequently, numerous methods have been developed in order to perform an automatic spectral analysis on a massive amount of data. When reviewing published results, biases arise and they need to be addressed and minimized. Aims. We are providing a homogeneous library with a common set of calibration stars (known as the Gaia FGK Benchmark Stars) that will allow to assess stellar analysis methods and calibrate spectroscopic surveys. Methods. High resolution and signal-to-noise spectra were compiled from different instruments. We developed an automatic process in order to homogenize the observed data and assess the quality of the resulting library. Results. We built a high quality library that will facilitate the assessment of spectral analyses and the calibration of present and future spectroscopic surveys. The automation of the process minimizes the human subjectivity and ensures reproducibility. Additionally, it allows us to quickly adapt the library to specific needs that can arise from future spectroscopic analyses.
description: accepted for publication in Astronomy and Astrophysics. Language corrections and updated reference parameters
Additional file 3 of Factors influencing conveyance of older adults with minor head injury by paramedics to the emergency department: a multiple methods study
Creators: name: Nicholson, Helen
name: Voss, Sarah
name: Black, Sarah
name: Taylor, Hazel
name: Williams, David
name: Benger, Jonathan
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 3. Patientfactors influencing conveyance of older adults with minor head injury byparamedics.
Momentum broadening of heavy quarks and jets in the Glasma from classical colored particle simulations
Creators: name: Avramescu, Dana
name: Băran, Virgil
name: Greco, Vincenzo
name: Ipp, Andreas
name: Müller, David. I.
name: Ruggieri, Marco
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the effects of the pre-equilibrium Glasma stage of heavy-ion collisions on the broadening of momentum for heavy quarks and jets using classical colored particle simulations based on Wong's equations. Confirming previous studies, we find that these probes accumulate momentum on the order of the saturation scale $Q_s$ and that the color field of the Glasma induces an anisotropy with more broadening along the beam axis. For quark jets the anisotropy is more pronounced at lower energies.
description: 4 pages, 1 figure, proceedings for the 29th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2022)
A superradiant two-level laser with intrinsic light force generated gain
Creators: name: Bychek, Anna
name: Ritsch, Helmut
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The implementation of a superradiant laser as an active frequency standard is predicted to provide better short-term stability and robustness to thermal and mechanical fluctuations when compared to standard passive optical clocks. However, despite significant recent progress, the experimental realization of continuous wave superradiant lasing still remains an open challenge as it requires continuous loading, cooling, and pumping of active atoms within an optical resonator. Here we propose a new scenario for creating continuous gain by using optical forces acting on the states of a two-level atom via bichromatic coherent pumping of a cold atomic gas trapped inside a single-mode cavity. Analogous to atomic maser setups, tailored state-dependent forces are used to gather and concentrate excited-state atoms in regions of strong atom-cavity coupling while ground-state atoms are repelled. To facilitate numerical simulations of a sufficiently large atomic ensemble, we rely on a second-order cumulant expansion and describe the atomic motion in a semi-classical point-particle approximation subject to position-dependent light shifts which induce optical gradient forces along the cavity axis. We study minimal conditions on pump laser intensities and detunings required for collective superradiant emission. Balancing Doppler cooling and gain-induced heating we identify a parameter regime of a continuous narrow-band laser operation close to the bare atomic frequency.
description: 9 pages, 8 figures
Effects of discontinuities of the derivatives of the inflaton potential
Creators: name: Cadavid, Alexander Gallego
name: Romano, Antonio Enea
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the effects of a class of features of the inflaton potential, corresponding to discontinuties in its derivatives. We perform fully numerical calculations and derive analytical approximations for the curvature pertubations spectrum and the bispectrum which are in good agreement with the numerical results. The spectrum of primordial perturbations has oscillations around the scale $k_0$ which leaves the horizon at the time $τ_0$ when the feature occurs, with the amplitude and phase of the oscillations determined by the size and the order of the discontinuity. The large scale bispectrum in the squeezed and equilateral limits have a very similar form and are linearly suppressed. Both in the squeezed and equilateral small scale limit the bispectrum has an oscillatory behavior whose phase depends on the parameters determining the discontinuity, and whose amplitude is inversely proportional to the scale. Given the generality of this class of features they could be used to model or classify phenomenologically different types of non Gaussian features encountered in observational data such as the cosmic microwave background radiation or large scale structure.
description: 26 pages, 22 figures, version accepted by EPJC
Baryons, multi-hadron systems, and composite dark matter in non-relativistic QCD
Creators: name: Assi, Benoît
name: Wagman, Michael L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We provide a formulation of potential non-relativistic quantum chromodynamics (pNRQCD) suitable for calculating binding energies and matrix elements of generic hadron and multi-hadron states made of heavy quarks in $SU(N_c)$ gauge theory using quantum Monte Carlo techniques. We compute masses of quarkonium and triply-heavy baryons in order to study the perturbative convergence of pNRQCD and validate our numerical methods. Further, we study $SU(N_c)$ models of composite dark matter and provide simple power series fits to our pNRQCD results that can be used to relate dark meson and baryon masses to the fundamental parameters of these models. For many systems comprised entirely of heavy quarks, the quantum Monte Carlo methods employed here are less computationally demanding than lattice field theory methods, although they introduce additional perturbative approximations. The formalism presented here may therefore be particularly useful for predicting composite dark matter properties for a wide range of $N_c$ and heavy fermion masses.
description: 39 pages, 24 figures
Additional file 2 of Factors influencing conveyance of older adults with minor head injury by paramedics to the emergency department: a multiple methods study
Creators: name: Nicholson, Helen
name: Voss, Sarah
name: Black, Sarah
name: Taylor, Hazel
name: Williams, David
name: Benger, Jonathan
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 2. Resource factors influencing conveyance of olderadults with minor head injury by paramedics.
Nanosecond light induced, thermally tunable transient dual absorption bands in a-Ge5As30Se65 thin film
Creators: name: Khan, Pritam
name: Saxena, Tarun
name: Adarsh, K. V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this article, we report the first observation of nanosecond laser induced transient dual absorption bands, one in the bandgap (TA1) and another in the sub-bandgap (TA2) regions of a-Ge5As30Se65 thin films. Strikingly, these bands are thermally tunable and exhibit a unique contrasting characteristic: the magnitude of TA1 decreases while that of TA2 increases with increasing temperature. Further, the decay kinetics of these bands is strongly influenced by the temperature, which signifies a strong temperature-dependent exciton recombination mechanism. The induced absorption shows quadratic and the decay time constant shows linear dependence on the laser beam fluence.
description: 17 pages, 6 figures
Excitonic Resonances in Coherent Anti-Stokes Raman Scattering from Single Wall Carbon Nanotubes
Creators: name: Gordeev, Georgy
name: Lafeta, Lucas
name: Flavel, Benjamin Scott
name: Jorio, Ado
name: Malard, Leandro M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work we investigate the role of exciton resonances in coherent anti-Stokes Raman scattering (er-CARS) in single walled carbon nanotubes (SWCNTs). We drive the nanotube system in simultaneous phonon and excitonic resonances, where we observe a superior enhancement by orders of magnitude exceeding non-resonant cases. We investigated the resonant effects in five $(n,m)$ chiralities and find that the er-CARS intensity varies drastically between different nanotube species. The experimental results are compared with a perturbation theory model. Finally, we show that such giant resonant non-linear signals enable rapid mapping and local heating of individualized CNTs, suggesting easy tracking of CNTs for future nanotoxology studies and therapeutic application in biological tissues.
description: 17 pages, 6 figures
Caffarelli-Kohn-Nirenberg type equations of fourth order with the critical exponent and Rellich potential
Creators: name: Bhakta, Mousomi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 31B30, 35J35, 35J75, 35J91

description: We study the existence/nonexistence of positive solution of $$ {Δ^2u-μ\frac{u}{|x|^4}=\frac{|u|^{q_β-2}u}{|x|^β}\quad\textrm{in $Ω$,}} $$ when $Ω$ is a bounded domain and $N\geq 5$, $q_β=\frac{2(N-β)}{N-4}$, $0\leq β<4$ and $0\leqμ0$.
description: 21 pages
Enhancement of Spin-Charge Conversion Efficiency for Co$_{3}$Sn$_{2}$S$_{2}$ across Transition from Paramagnetic to Ferromagnetic Phase
Creators: name: Seki, Takeshi
name: Lau, Yong-Chang
name: Ikeda, Junya
name: Fujiwara, Kohei
name: Ozawa, Akihiro
name: Iihama, Satoshi
name: Nomura, Kentaro
name: Tsukazaki, Atsushi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Co$_{3}$Sn$_{2}$S$_{2}$ (CSS) is one of the shandite compounds and becomes a magnetic Weyl semimetal candidate below the ferromagnetic phase transition temperature ($\textit{T}_\textrm{C}$). In this paper, we investigate the temperature ($\textit{T}$) dependence of conversion between charge current and spin current for the CSS thin film by measuring the spin-torque ferromagnetic resonance (ST-FMR) for the trilayer consisting of CSS / Cu / CoFeB. Above $\textit{T}_\textrm{C}$ ~ 170 K, the CSS / Cu / CoFeB trilayer exhibits the clear ST-FMR signal coming from the spin Hall effect in the paramagnetic CSS and the anisotropic magnetoresistance (AMR) of CoFeB. Below $\textit{T}_\textrm{C}$, on the other hand, it is found that the ST-FMR signal involves the dc voltages ($\textit{V}_\textrm{dc}$) not only through the AMR but also through the giant magnetoresistance (GMR). Thus, the resistance changes coming from both AMR and GMR should be taken into account to correctly understand the characteristic field angular dependence of $\textit{V}_\textrm{dc}$. The spin Hall torque generated from the ferromagnetic CSS, which possesses the same symmetry as that for spin Hall effect, dominantly acts on the magnetization of CoFeB. A definite increase in the spin-charge conversion efficiency ($ξ$) is observed at $\textit{T}$ < $\textit{T}_\textrm{C}$, indicating that the phase transition to the ferromagnetic CSS promotes the highly efficient spin-charge conversion. In addition, our theoretical calculation shows the increase in spin Hall conductivity with the emergence of magnetic moment at $\textit{T}$ < $\textit{T}_\textrm{C}$, which is consistent with the experimental observation.
description: 38 pages, 8 figures, 2 tables
MAGPy: a tool for Gaussian process regression and its application to planet detection
Creators: name: Rescigno, Federica
Publisher: name: Zenodo
Year: 2022
Subjects: planet detection
Gaussian process
radial velocity
HARPS-N
data reduction

description: I present MAGPy, a new soon-to-be-public Gaussian process (GP) regression pipeline with affine-invariant Markov Chain Monte Carlo (MCMC) parameter space searching algorithm. The pipeline was developed for planetary detection, but it is flexible enough to be used for any GP regression analysis. We also present the detection of a sub-Neptune and a sub-Saturn planet orbiting the high-proper motion K-dwarf TOI-2134.
description: The complete analysis is currently in process and its paper in prep. The poster presents the preliminary results obtained before July 2022.
description: {"references": ["Lagrange A. M., Desort M., Meunier N., 2010, A&A, 512, A38", "Meunier N., Desort M., Lagrange A. M., 2010, A&A, 512, A39", "Haywood R. D., et al., 2014, MNRAS, 443, 2517", "Cosentino R., et al., 2012, Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series Vol. 8446, p. 84461V"]}
Firmware
Creators: name: Earley, Eric J.
name: Ortiz-Catalan, Max
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: ADS_BP
subject: EMG
subject: open source
subject: bioelectric signal
subject: BioPatRec
subject: data acquisition
subject: pattern recognition

description: Files pertaining to the firmware loaded to the ADS_BP handling on-board operations.
Atomic gravimeter robust to environmental effects
Creators: name: Panda, Cristian D.
name: Tao, Matt
name: Ceja, Miguel
name: Reynoso, Andrew
name: Müller, Holger
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Atomic accelerometers and gravimeters are usually based on freely-falling atoms in atomic fountains, which not only limits their size, but also their robustness to environmental factors such as tilts, magnetic fields or vibrations. Such limitations have precluded their broad adoption in the field, for geophysics, geology, and inertial navigation. More recently, atom interferometers based on holding atoms in an optical lattice have been developed. Such gravimeters also suppress the influence of vibrations in the frequency range of ~1 Hz and above by several orders of magnitude relative to conventional atomic gravimeters. Here, we show that such interferometers are robust to tilts of more than 8 mrad with respect to the vertical and can suppress the effect of even strong environmental magnetic fields and field gradients by using atoms in the F=3,4 hyperfine ground states as co-magnetometers, potentially eliminating the need for shielding. We demonstrate gravimeter sensitivity of $0.7~\rm{mGal}/\sqrt{\rm Hz}$ ($1~{\rm mGal}=10~μ\rm{m/s}^2$) in a compact geometry where atoms only travel over mm of space.
description: 9 pages, 4 figures
ADS_BP
Creators: name: Earley, Eric J.
name: Ortiz-Catalan, Max
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: BioPatRec
subject: data acquisition
subject: bioelectric signal
subject: pattern recognition
subject: EMG
subject: ADS_BP
subject: open source

description: Files pertaining to the manufacture and assembly of the ADS_BP board, including DipTrace projects, gerber and drill files, and a bill of materials.
Pablo Maria Garrido, La ≪Reforma≫ Teresiana y la Orden del Carmen. ≪Ruptura≫ o complemento?, Institutum Carmelitanum, Roma 1991, 168 pp., 190X115, ISBN 88-7288-020-3
Creators: name: Arieiro, José
Publisher: name: Theologica
Year: 1994

description: Theologica, v. 29 n. 2 (1994): Santuários marianos | Braga e Viana do Castelo
Measurement of the forward $η$ meson production rate in p-p collisions at $\sqrt{s}$=13 TeV with the LHCf-Arm2 detector
Creators: name: Piparo, Giuseppe
name: Adriani, Oscar
name: Berti, Eugenio
name: Betti, Pietro
name: Bonechi, Lorenzo
name: Bongi, Massimo
name: D'Alessandro, Raffaello
name: Detti, Sebastiano
name: Haguenauer, Maurice
name: Itow, Yoshitaka
name: Kasahara, Katsuaki
name: Kitagami, Yuga
name: Kondo, Moe
name: Matsubara, Yutaka
name: Menjo, Hiroaki
name: Muraki, Yasushi
name: Ohashi, Ken
name: Papini, Paolo
name: Ricciarini, Sergio
name: Sako, Takashi
name: Sakurai, Nobuyuki
name: Scaringella, Monica
name: Shimizu, Yuki
name: Tamura, Tadashi
name: Tiberio, Alessio
name: Torii, Shoji
name: Tricomi, Alessia
name: Turner, William C.
name: Yoshida, Kenji
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The forward $η$ mesons production has been observed by the Large Hadron Collider forward (LHCf) experiment in proton-proton collision at $\sqrt{s}$=13 TeV. This paper presents the measurement of the inclusive production rate of $η$ in $p_T<$ 1.1 GeV/c, expressed as a function of the Feynman-x variable. These results are compared with the predictions of several hadronic interaction models commonly used for the modelling of the air showers produced by ultra-high energy cosmic rays. This is both the first measurement of $η$ mesons from LHCf and the first time a particle containing strange quarks has been observed in the forward region for high-energy collisions. These results will provide a powerful constraint on hadronic interaction models for the purpose of improving the understanding of the processes underlying the air showers produced in the Earth's atmosphere by ultra-energetic cosmic rays.
description: 18 pages, 7 figures, 4 tables
Magnetic Breakdown and Topology in the Kagome Superconductor CsV3Sb5 under High Magnetic Field
Creators: name: Chapai, Ramakanta
name: Leroux, Maxime
name: Oliviero, Vincent
name: Vignolles, David
name: Smylie, M. P.
name: Chung, D. Y.
name: Kanatzidis, M. G.
name: Kwok, W. -K.
name: Mitchell, J. F.
name: Welp, Ulrich
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The recently discovered layered Kagome metals of composition AV3Sb5 (A = K, Rb, Cs) exhibit a complex interplay among superconductivity, charge density wave order, topologically non-trivial electronic band structure and geometrical frustration. Here, we probe the electronic band structure underlying these exotic correlated electronic states in CsV3Sb5 with quantum oscillation measurements in pulsed fields up to 86 T. The high-field data reveal a sequence of magnetic breakdown orbits that allows the construction of a model for the folded Fermi surface of CsV3Sb5. The dominant features are large triangular Fermi surface sheets that cover almost half of the folded Brillouin zone that have not yet been detected in angle resolved photoemission spectroscopy (ARPES). These sheets display pronounced nesting at the charge density wave (CDW) vectors, which may stabilize the CDW state. The Berry phases of the electron orbits have been deduced from Landau level fan diagrams near the quantum limit without the need for extrapolations, thereby unambiguously establishing the non-trivial topological character of several electron bands in this Kagome lattice superconductor.
description: 28 pages, 10 figures, 1 table, Supplementary Materials added
Additional file 1 of Factors influencing conveyance of older adults with minor head injury by paramedics to the emergency department: a multiple methods study
Creators: name: Nicholson, Helen
name: Voss, Sarah
name: Black, Sarah
name: Taylor, Hazel
name: Williams, David
name: Benger, Jonathan
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1. Interview topic guide. Topicguide for paramedic interviews.
Additional file 1 of The substantiveness of socioeconomic school compositional effects in Australia: measurement error and the relationship with academic composition
Creators: name: Sciffer, Michael G.
name: Perry, Laura B.
name: McConney, Andrew
Publisher: name: figshare
Year: 2022
Subjects: subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: Additional file 1. Appendix.
Galactic diffuse gamma-ray emission from GeV to PeV energies in light of up-to-date cosmic ray measurements
Creators: name: Zhang, Rui
name: Huang, Xiaoyuan
name: Xu, Zhi-Hui
name: Zhao, Shiping
name: Yuan, Qiang
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The diffuse gamma-ray emission between 10 and 1000 TeV from the Galactic plane was recently measured by the Large High Altitude Air Shower Observatory (LHAASO). These observations will help tremendously in constraining the propagation and interaction of cosmic rays in the Milky Way. Additionally, new measurements of CR spectra reach a very high precision up to 100 TeV energies, revealing multiple spectral structures of various species. In this work, we confront the model prediction of the diffuse gamma-ray emission, based on up-to-date measurements of the local cosmic ray spectra and simplified propagation setup, with the measurements of diffuse gamma-rays. To better constrain the low-energy part of the model, we analyze the 14.6 years of Fermi-LAT data to extract the Galactic diffuse emission between 1 and 500 GeV from the same sky regions of LHAASO, after subtracting the contribution from known sources and the isotropic diffuse gamma-ray background. The joint Fermi-LAT and LHAASO spectra thus cover a very wide energy range from 1 GeV to 1 PeV with small gaps from 0.5 to 10 TeV. Compared with the prediction, we find that clear excesses between several GeV and ~60 TeV of the diffuse emission exist. Possible reasons to explain the excesses may include unresolved sources or more complicated propagation models. We illustrate that an exponential-cutoff-power-law component with an index of -2.40 and cutoff energy of ~30 TeV is able to account for such excesses.
Parity and symmetry in intersection and ordinary cohomology
Creators: name: Sun, Shenghao
name: Zheng, Weizhe
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14F20 (Primary), 14G15, 14G25, 14F43, 11E81 (Secondary)

description: In this paper, we show that the Galois representations provided by $\ell$-adic cohomology of proper smooth varieties, and more generally by $\ell$-adic intersection cohomology of proper varieties, over any field, are orthogonal or symplectic according to the degree. We deduce this from a preservation result of orthogonal and symplectic pure perverse sheaves by proper direct image. We show moreover that the subgroup of the Grothendieck group generated by orthogonal pure perverse sheaves of even weights and symplectic pure perverse sheaves of odd weights are preserved by Grothendieck's six operations. Over a finite field, we deduce parity and symmetry results for Jordan blocks appearing in the Frobenius action on intersection cohomology of proper varieties, and virtual parity results for the Frobenius action on ordinary cohomology of arbitrary varieties.
description: 48 pages. v7: improved 4.3.1
A Quantum Breakdown Model: from Many-body Localization to Chaos with Scars
Creators: name: Lian, Biao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a quantum model of fermions simulating the electrical breakdown process of dielectrics. The model consists of $M$ sites with $N$ fermion modes per site, and has a conserved charge $Q$. It has an on-site chemical potential $μ$ with disorder $W$, and an interaction of strength $J$ restricting each fermion to excite two more fermions when moving forward by one site. We show the $N=3$ model with disorder $W=0$ show a Hilbert space fragmentation and is exactly solvable except for very few Krylov subspaces. The analytical solution shows that the $N=3$ model exhibits many-body localization (MBL) as $M\rightarrow\infty$, which is stable against $W>0$ as our exact diagonalization (ED) shows. At $N>3$, our ED suggests a MBL to quantum chaos crossover at small $W$ as $M/N$ decreases across $1$, and persistent MBL at large $W$. At $W=0$, an exactly solvable many-body scar flat band exists in many charge $Q$ sectors, which has a nonzero measure in the thermodynamic limit. We further calculate the time evolution of a fermion added to the particle vacuum, which shows a breakdown (dielectric) phase when $μ/J<1/2$ ($μ/J>1/2$) if $W\ll J$, and no breakdown if $W\gg J$.
description: 21+8 pages, 17+5 figures
Edge-Enhanced Microscopy of Comlplex Object using Scalar and Vectorial Vortex Filtering
Creators: name: Zangpo, Jigme
name: Kawabe, Tomohiro
name: Kobayashi, Hirokazu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Recently, $4f$ system containing a q-plate has been used to perform edge detection and enhancement of amplitude and phase objects. However, only few studies have concentrated on edge enhancement of phase-amplitude objects. Here, we experimentally verified the functional difference between scalar and vectorial vortex filtering using an onion cell, the experimental results agree well with theoretical analysis. We verified our experimental results through numerical simulation. Although vectorial vortex filtering successfully enhanced the edges of phase and amplitude objects in the phase-amplitude object, they are indistinguishable due to the equal enhancement of the edges of the phase and amplitude objects. To address this, we propose a method to isolate the edge of the phase object from the edge of the amplitude object using off-axis beam illumination. We theoretically calculated the isolation of the edge of the phase object from the amplitude object, and verified via numerical simulations.
António Abel Rodrigues CANAVARRO, O P. Diogo Monteiro (1561- 1634) e a sua Arte de Orar, Colecção «Memorabilia Christiana» 3, Universidade Católica Portuguesa/Edit. Apostolado da Oração, Braga, 1992, 200 pp., 260X190
Creators: name: Araújo, António De
Publisher: name: Theologica
Year: 1994

description: Theologica, v. 29 n. 2 (1994): Santuários marianos | Braga e Viana do Castelo
Double ramification cycles and integrable hierarchies
Creators: name: Buryak, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It this paper we present a new construction of a hamiltonian hierarchy associated to a cohomological field theory. We conjecture that in the semisimple case our hierarchy is related to the Dubrovin-Zhang hierarchy by a Miura transformation and check it in several examples.
description: Final version, 18 pages
Long-Tailed Classification of Thorax Diseases on Chest X-Ray: A New Benchmark Study
Creators: name: Holste, Gregory
name: Wang, Song
name: Jiang, Ziyu
name: Shen, Thomas C.
name: Shih, George
name: Summers, Ronald M.
name: Peng, Yifan
name: Wang, Zhangyang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Imaging exams, such as chest radiography, will yield a small set of common findings and a much larger set of uncommon findings. While a trained radiologist can learn the visual presentation of rare conditions by studying a few representative examples, teaching a machine to learn from such a "long-tailed" distribution is much more difficult, as standard methods would be easily biased toward the most frequent classes. In this paper, we present a comprehensive benchmark study of the long-tailed learning problem in the specific domain of thorax diseases on chest X-rays. We focus on learning from naturally distributed chest X-ray data, optimizing classification accuracy over not only the common "head" classes, but also the rare yet critical "tail" classes. To accomplish this, we introduce a challenging new long-tailed chest X-ray benchmark to facilitate research on developing long-tailed learning methods for medical image classification. The benchmark consists of two chest X-ray datasets for 19- and 20-way thorax disease classification, containing classes with as many as 53,000 and as few as 7 labeled training images. We evaluate both standard and state-of-the-art long-tailed learning methods on this new benchmark, analyzing which aspects of these methods are most beneficial for long-tailed medical image classification and summarizing insights for future algorithm design. The datasets, trained models, and code are available at https://github.com/VITA-Group/LongTailCXR.
description: DALI 2022 (MICCAI workshop)
Additional file 1 of Assessment of the ability, perception, and readiness of nurses to manage tracheostomy-related complications in Riyadh City: a cross-sectional study
Creators: name: Alotaibi, Fahad Zarraq
name: Alkhatabi, Reema
name: Allowaihiq, Lujain
name: Alhazzani, Hassan
name: Alshehri, Ghada
name: Hajr, Eman A.
name: Alkholaiwi, Feras
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Cancer
subject: Science Policy

description: Additional file 1. Supplementary Material.
Emergent SU(3) symmetry in random spin-1 chains
Creators: name: Quito, V. L.
name: Hoyos, José A.
name: Miranda, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that generic SU(2)-invariant random spin-1 chains have phases with an emergent SU(3) symmetry. We map out the full zero-temperature phase diagram and identify two different phases: (i) a conventional random singlet phase (RSP) of strongly bound spin pairs (SU(3) "mesons") and (ii) an unconventional RSP of bound SU(3) "baryons", which are formed, in the great majority, by spin trios located at random positions. The emergent SU(3) symmetry dictates that susceptibilities and correlation functions of both dipolar and quadrupolar spin operators have the same asymptotic behavior.
description: 5 pages plus 3-page Supplemental Material, 5 figures; published version