cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reduced-order modeling for complex 3D seismic wave propagation
Creators: name: Rekoske, John M.
name: May, Dave A.
name: Gabriel, Alice-Agnes
Publisher: name: arXiv
Year: 2024
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Elastodynamic Green's functions are an essential ingredient in seismology as they form the connection between direct observations of seismic waves and the earthquake source. They are also fundamental to various seismological techniques including physics-based ground motion prediction and kinematic or dynamic source inversions. In regions with established 3D models of the Earth's elastic structure, 3D Green's functions can be computed using numerical simulations of seismic wave propagation. However, such simulations are computationally expensive which poses challenges for real-time ground motion prediction. Here, we use a reduced-order model (ROM) approach that enables the rapid evaluation of approximate Green's functions. The ROM technique developed approximates three-component surface velocity wavefields obtained from numerical simulations of seismic wave propagation. We apply our ROM approach to a 50 km x 40 km area in the greater Los Angeles area accounting for topography, site effects, 3D subsurface velocity structure, and viscoelastic attenuation. The ROM constructed for this region enables rapid computation (0.001 CPU hours) of complete, high-resolution, 0.5 Hz surface velocity wavefields that are accurate for a shortest wavelength of 1.0 km. Using leave-one-out cross validation, we measure the accuracy of our Green's functions in both the time-domain and frequency-domain. Averaged across all sources and receivers, the error in the rapid seismograms is less than 0.01 cm/s. We demonstrate that the ROM can accurately and rapidly reproduce simulated seismograms for generalized moment tensor sources in our region, as well as kinematic sources by using a finite fault model of the 1987 Mw 5.9 Whittier Narrows earthquake as an example. We envision that our rapid, approximate Green's functions will be useful for constructing rapid ground motion synthetics with high spatial resolution.
Coherent Control of a Long-Lived Nuclear Memory Spin in a Germanium-Vacancy Multi-Qubit Node
Creators: name: Grimm, Nick
name: Senkalla, Katharina
name: Vetter, Philipp J.
name: Frey, Jurek
name: Gundlapalli, Prithvi
name: Calarco, Tommaso
name: Genov, Genko
name: Müller, Matthias M.
name: Jelezko, Fedor
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The ability to process and store information on surrounding nuclear spins is a major requirement for group-IV color center-based repeater nodes. We demonstrate coherent control of a ${}^{13}$C nuclear spin strongly coupled to a negatively charged germanium-vacancy center in diamond with coherence times beyond 2.5s at mK temperatures, which is the longest reported for group-IV defects. Detailed analysis allows us to model the system's dynamics, extract the coupling parameters, and characterize noise. We estimate an achievable memory time of 18.1s with heating limitations considered, paving the way to successful applications as a quantum repeater node.
On an invariance property of the space of smooth vectors
Creators: name: Neeb, Karl-Hermann
name: Salmasian, Hadi
name: Zellner, Christoph
Publisher: name: arXiv
Year: 2014
Subjects: subject: Representation Theory (math.RT)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 22E65, 22E45, 17B65

description: Let $(π, \mathcal H)$ be a continuous unitary representation of the (infinite dimensional) Lie group $G$ and $γ\: \mathbb R \to \mathrm{Aut}(G)$ define a continuous action of $\mathbb R$ on $G$. Suppose that $π^\#(g,t) = π(g) U_t$ defines a continuous unitary representation of the semidirect product group $G \rtimes_γ\mathbb R$. The first main theorem of the present note provides criteria for the invariance of the space $\mathcal H^\infty$ of smooth vectors of $π$ under the operators $U_f = \int_\mathbb R f(t)U_t\, dt$ for $f \in L^1(\mathbb R)$, resp., $f \in \mathcal S(\mathbb R)$. Using this theorem we show that, for suitably defined spectral subspaces $\mathfrak g_{\mathbb C}(E)$, $E \subseteq \mathbb R$, in the complexified Lie algebra $\mathfrak g_{\mathbb C}$, and $\mathcal H^\infty(F)$, $F\subseteq \mathbb R$, for $U$ in $\mathcal H^\infty$, we have \[ \mathsf{d}π(\mathfrak g_{\mathbb C}(E)) \mathcal H^\infty(F) \subseteq \mathcal H^\infty(E + F).\]
description: Accepted by Kyoto Journal of Math
Shortcuts to adiabaticity in open quantum critical systems
Creators: name: Mahunta, Shishira
name: Mukherjee, Victor
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study shortcuts to adiabaticity (STAs) through counterdiabatic driving in quantum critical systems in the presence of dissipation. We evaluate unitary as well as nonunitary controls, such that the system density matrix follows a prescribed trajectory corresponding to the eigenstates of a time-dependent reference Hamiltonian at any instant of time. The strength of the dissipator control term for the low-energy states shows universal scaling close to criticality. Using the example of free-fermionic systems, in particular, the transverse-field Ising model, we show that in contrast to STAs in closed quantum critical systems, here, STAs may require multibody interactions terms, even away from criticality, owing to the change in entropy of the time-dependent target state. Further, the associated heat current shows an extremum, while power dissipation changes curvature, close to criticality, and analogous to unitary control, no operational cost is associated with implementation of the exact counterdiabatic Hamiltonian. We believe the counterdiabatic protocol studied here could be of fundamental importance for understanding STAs in many-body open quantum systems and could be highly relevant for varied topics involving open many-body quantum systems, such as quantum computation and many-body quantum heat engines.
description: 8 pages, 3 figures
Flore d'Afrique centrale - Spermatophyta - Phytolaccaceae
Creators: name: Balle, S.
Publisher: name: Zenodo
Year: 1951
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Phytolaccaceae in Flore d'Afrique centrale series
Strategies to diversify Canadian baccalaureate nursing education: A scoping review protocol
Creators: name: Jap, Jennifer
name: Zakher, Bernadette
name: Mussell, Jessica
name: Dordunoo, Dzifa
name: Jaymelyn Hubert
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences

description: A scoping review protocol that aims to identify and characterize strategies for recruiting and retaining students from historically marginalized communities into Canadian baccalaureate nursing education programs.
Monmouth University Poll: March 2016 Ohio Primary
Creators: name: Monmouth University Polling Institute
Publisher: name: Roper Center for Public Opinion Research
Year: 2022

description: Registered to vote (1); voter likelihood (1); Republican/Democratic presidential primary (2); Republican presidential primary candidates (4); Open presidential primary opposite party voting (4); Businessman Donald Trump support post rally (1); Trump vs. Former Secretary of State Hillary Clinton vs. an Independent (2); Governor John Kasich job approval (2); Democratic presidential primary candidates (3); Trump vs. Senator Bernie Sanders vs. an Independent (1).
title: Elasto-Plastic Analysis of Buried Pipelines Subjected to the Large Fault Movement
Creators: name: Wang, Luo-Jia
Publisher: name: Old Dominion University Libraries
Year: 1993

description: The responses of buried pipelines subjected to a large fault movement are examined based upon a new non-linear cantilever beam analogy. This analogy assumes that the pipeline in the large deformation zone behaves like a cantilever beam subjected to a transversely concentrated shear at the inflection point and a uniformly distributed soil pressure along the entire span. Tangent modulus approach is adopted to analyze the coupled axial force-bending moment interaction effect on pipeline deformation in the inelastic range. Parametric studies of both tensile and compressive responses of buried pipeline to various fault movements, crossing angles, buried depths, pipe diameters and thicknesses are investigated and compared with the previous available results. Stability analysis for the pipeline subjected to a compressive fault is also presented.
Three-generation Asymmetric Orbifold Models from Heterotic String Theory
Creators: name: Beye, Florian
name: Kobayashi, Tatsuo
name: Kuwakino, Shogo
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using Z3 asymmetric orbifolds in heterotic string theory, we construct N=1 SUSY three-generation models with the standard model gauge group SU(3)_C \times SU(2)_L \times U(1)_Y and the left-right symmetric group SU(3)_C \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}. One of the models possesses a gauge flavor symmetry for the Z3 twisted matter.
description: 24 pages
Spherical coverings and X-raying convex bodies of constant width
Creators: name: Bondarenko, A.
name: Prymak, A.
name: Radchenko, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: Primary 52C17, Secondary 52A20, 52A40, 52C35

description: K. Bezdek and Gy. Kiss showed that existence of origin-symmetric coverings of unit sphere in $\mathbb{E}^n$ by at most $2^n$ congruent spherical caps with radius not exceeding $\arccos\sqrt{\frac{n-1}{2n}}$ implies the $X$-ray conjecture and the illumination conjecture for convex bodies of constant width in $\mathbb{E}^n$, and constructed such coverings for $4\le n\le 6$. Here we give such constructions with fewer than $2^n$ caps for $5\le n\le 15$.
 For the illumination number of any convex body of constant width in $\mathbb{E}^n$, O.~Schramm proved an upper estimate with exponential growth of order $(3/2)^{n/2}$. In particular, that estimate is less than $3\cdot 2^{n-2}$ for $n\ge 16$, confirming the above mentioned conjectures for the class of convex bodies of constant width. Thus, our result settles the outstanding cases $7\le n\le 15$.
 We also show how to calculate the covering radius of a given discrete point set on the sphere efficiently on a computer.
Foliations, solvability and global injectivity
Creators: name: Braun, Francisco
name: Filho, José Ruidival dos Santos
name: Teixeira, Marco Antonio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: Let $F: \mathbb{R}^n\to\mathbb{R}^n$ be a $C^{\infty}$ map such that $DF(x)$ is invertible for every $x\in\mathbb{R}^n$. Although being a local diffeomorphism, $F$ is not necessarily globally injective if $n\geq2$. Finding additional assumptions implying the global injectivity of $F$ for $n\geq 2$ is object of intense study in several areas of Mathematics. In this paper we revisit some assumptions and relations between them in the bidimensional case and discuss the natural higher dimensional situation.
Introduction to the IndetermSoft Set and IndetermHyperSoft Set
Creators: name: Smarandache, Florentin
Publisher: name: figshare
Year: 2022
Subjects: Mathematical logic, set theory, lattices and universal algebra

description: In this paper one introduces for the first time the IndetermSoft Set, as extension of the classical (determinate) Soft Set, that deals with indeterminate data, and similarly the HyperSoft Set extended to IndetermHyperSoft Set, where ‘Indeterm’ stands for ‘Indeterminate’ (uncertain, conflicting, not unique outcome). They are built on an IndetermSoft Algebra that is an algebra dealing with IndetermSoft Operators resulted from our real world. Afterwards, the corresponding Fuzzy / Intuitionistic Fuzzy / Neutrosophic / and other fuzzy-extension IndetermSoft Set & IndetermHyperSoft Set are presented together with their applications.
Deep Ritz-Finite Element methods: Neural Network Methods trained with Finite Elements
Creators: name: Grekas, Georgios
name: Makridakis, Charalambos G.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 65M15, 65M12

description: While much attention of neural network methods is devoted to high-dimensional PDE problems, in this work we consider methods designed to work for elliptic problems on domains $Ω\subset \mathbb{R} ^d, $ $d=1,2,3$ in association with more standard finite elements. We suggest to connect finite elements and neural network approximations through training, i.e., using finite element spaces to compute the integrals appearing in the loss functionals. This approach, retains the simplicity of classical neural network methods for PDEs, uses well established finite element tools (and software) to compute the integrals involved and it gains in efficiency and accuracy. We demonstrate that the proposed methods are stable and furthermore, we establish that the resulting approximations converge to the solutions of the PDE. Numerical results indicating the efficiency and robustness of the proposed algorithms are presented.
Flore d'Afrique centrale - Spermatophyta - Portulacaceae
Creators: name: Hauman, L.
Publisher: name: Zenodo
Year: 1951
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Portulacaceae in Flore d'Afrique centrale series
Violation of contextual generalization of the Leggett-Garg inequality for recognition of ambiguous figures
Creators: name: Asano, Masanari
name: Hashimoto, Takahisa
name: Khrennikov, Andrei
name: Ohya, Masanori
name: Tanaka, Yoshiharu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: Quantum Physics (quant-ph)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We interpret the Leggett-Garg (LG) inequality as a kind of contextual probabilistic inequality in which one combines data collected in experiments performed for three different contexts. In the original version of the inequality these contexts have the temporal nature and they are given by three pairs of instances of time, $(t_1, t_2), (t_2, t_3), (t_3, t_4),$ where $t_1 < t_2 < t_3.$ We generalize LG conditions of macroscopic realism and noninvasive measurability in the general contextual framework. Our formulation is done in the purely probabilistic terms: existence of the context independent joint probability distribution $P$ and the possibility to reconstruct the experimentally found marginal (two dimensional) probability distributions from the $P.$ We derive an analog of the LG inequality, "contextual LG inequality", and use it as a test of "quantum-likeness" of statistical data collected in a series of experiments on recognition of ambiguous figures. In our experimental study the figure under recognition is the Schroeder stair which is shown with rotations for different angles. Contexts are encoded by dynamics of rotations: clockwise, anticlockwise, and random. Our data demonstrated violation of the contextual LG inequality for some combinations of aforementioned contexts. Since in quantum theory and experiments with quantum physical systems this inequality is violated, e.g., in the form of the original LG-inequality, our result can be interpreted as a sign that the quantum(-like) models can provide a more adequate description of the data generated in the process of recognition of ambiguous figures.
description: Presented at the conference Quantum Interactions 14, University of Leicester, July 2014; submitted to Physica Scripta, IOP; new version contains discussions on Bell and contextuality, marginal selectivity, Kolmogorovization of contextual data
Analytic geometry over F_1 and the Fargues-Fontaine curve
Creators: name: Bambozzi, Federico
name: Ben-Bassat, Oren
name: Kremnizer, Kobi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: Functional Analysis (math.FA)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: This paper develops a theory of analytic geometry over the field with one element. The approach used is the analytic counter-part of the Toen-Vaquie theory of schemes over F_1, i.e. the base category relative to which we work out our theory is the category of sets endowed with norms (or families of norms). Base change functors to analytic spaces over Banach rings are studied and the basic spaces of analytic geometry (like polydisks) are recovered as a base change of analytic spaces over F_1. We end by discussing some applications of our theory to the theory of the Fargues-Fontaine curve and to the ring Witt vectors.
description: Small corrections have been made in the last section of the paper and some typos have been corrected
Distance between reproducing kernel Hilbert spaces and geometry of finite sets in the unit ball
Creators: name: Ofek, Danny
name: Pandey, Satish K.
name: Shalit, Orr
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46E22

description: In this paper we study the relationships between a reproducing kernel Hilbert space, its multiplier algebra, and the geometry of the point set on which they live. We introduce a variant of the Banach-Mazur distance suited for measuring the distance between reproducing kernel Hilbert spaces, that quantifies how far two spaces are from being isometrically isomorphic as reproducing kernel Hilbert spaces. We introduce an analogous distance for multiplier algebras, that quantifies how far two algebras are from being completely isometrically isomorphic. We show that, in the setting of finite dimensional quotients of the Drury-Arveson space, two spaces are "close" to one another if and only if their multiplier algebras are "close", and that this happens if and only if the underlying point-sets are "almost congruent", meaning that one of the sets is very close to an image of the other under a biholomorphic automorphism of the unit ball. These equivalences are obtained as corollaries of quantitative estimates that we prove.
description: 24 pages. To appear in Journal of Mathematical Analysis and Applications
KT4D Plan for Dissemination, Exploitation and Communication Activities
Creators: name: Ahern, Joanne
name: Osimanti, Francesco
Publisher: name: Zenodo
Year: 2023
Subjects: Knowledge technology, Democracy, Dissemination, Communication, Exploitation, Civic participation, AI, Artificial Intelligence, Big Data, KT4D

description: KT4D's “Plan for Dissemination, Exploitation and Communication Activities”, released at Month three, outlines and describes the main objectives and actions for the communication, dissemination, and stakeholder engagement activities for Knowledge Technologies for Democracy (KT4D), the methodology and assets underpinning the strategy. It outlines the actions taken during the first three months (M1 to M3) as well as the envisaged set of actions for the duration of the project going forward (M3-M36) to ensure the successful achievement of the project objectives in terms of appropriate dissemination of main results and outputs, community building endeavours and project recognition. The KT4D Plan for Dissemination, Exploitation and Communication Activities is structured to use an extensive set of communication channels to target the wide and diverse network of Stakeholders involved, and through the proactive support of the entire consortium will successfully promote and disseminate the project’s main results and outcomes using an extensive set of communication channels which will be outlined in this document.
The CRAFT Coherent (CRACO) upgrade I: System Description and Results of the 110-ms Radio Transient Pilot Survey
Creators: name: Wang, Z.
name: Bannister, K. W.
name: Gupta, V.
name: Deng, X.
name: Pilawa, M.
name: Tuthill, J.
name: Bunton, J. D.
name: Flynn, C.
name: Glowacki, M.
name: Jaini, A.
name: Lee, Y. W. J.
name: Lenc, E.
name: Lucero, J.
name: Paek, A.
name: Radhakrishnan, R.
name: Thyagarajan, N.
name: Uttarkar, P.
name: Wang, Y.
name: Bhat, N. D. R.
name: James, C. W.
name: Moss, V. A.
name: Murphy, Tara
name: Reynolds, J. E.
name: Shannon, R. M.
name: Spitler, L. G.
name: Tzioumis, A.
name: Caleb, M.
name: Deller, A. T.
name: Gordon, A. C.
name: Marnoch, L.
name: Ryder, S. D.
name: Simha, S.
name: Anderson, C. S.
name: Ball, L.
name: Brodrick, D.
name: Cooray, F. R.
name: Gupta, N.
name: Hayman, D. B.
name: Ng, A.
name: Pearce, S. E.
name: Phillips, C.
name: Voronkov, M. A.
name: Westmeier, T.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present the first results from a new backend on the Australian Square Kilometre Array Pathfinder, the Commensal Realtime ASKAP Fast Transient COherent (CRACO) upgrade. CRACO records millisecond time resolution visibility data, and searches for dispersed fast transient signals including fast radio bursts (FRB), pulsars, and ultra-long period objects (ULPO). With the visibility data, CRACO can localise the transient events to arcsecond-level precision after the detection. Here, we describe the CRACO system and report the result from a sky survey carried out by CRACO at 110ms resolution during its commissioning phase. During the survey, CRACO detected two FRBs (including one discovered solely with CRACO, FRB 20231027A), reported more precise localisations for four pulsars, discovered two new RRATs, and detected one known ULPO, GPM J1839-10, through its sub-pulse structure. We present a sensitivity calibration of CRACO, finding that it achieves the expected sensitivity of 11.6 Jy ms to bursts of 110 ms duration or less. CRACO is currently running at a 13.8 ms time resolution and aims at a 1.7 ms time resolution before the end of 2024. The planned CRACO has an expected sensitivity of 1.5 Jy ms to bursts of 1.7 ms duration or less, and can detect 10x more FRBs than the current CRAFT incoherent sum system (i.e., 0.5-2 localised FRBs per day), enabling us to better constrain he models for FRBs and use them as cosmological probes.
description: 26 pages, 19 figures, 9 tables, Accepted for publication in PASA
Effects of secular growth and mergers on the evolution of metallicity gradients and azimuthal variations in a Milky Way-like galaxy
Creators: name: Renaud, Florent
name: Ratcliffe, Bridget
name: Minchev, Ivan
name: Haywood, Misha
name: Di Matteo, Paola
name: Agertz, Oscar
name: Romeo, Alessandro B.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the evolution of the radial profiles and the azimuthal variations of the stellar metallicities from the Vintergatan simulation of a Milky Way-like galaxy. We find that negative gradients exist as soon as the disk settles at high redshift, and are maintained throughout the long term evolution of the galaxy, including during major merger events. The inside-out growth of the disk and an overall outward radial migration tend to flatten these gradients in time. Major merger events only have a moderate and short-lived imprint on the [Fe/H] distributions with almost no radial dependence. The reason lies in the timescale for enrichment in Fe being significantly longer than the duration of the starbursts episodes, themselves slower than dynamical mixing during typical interactions. It results that signatures of major mergers become undetectable in [Fe/H] only a few Myr after pericenter passages. We note that considering other tracers like the warm interstellar medium, or monitoring the evolution of the metallicity gradient as a single value instead of a radial full profile could lead to different interpretations, and warn against an oversimplification of this complex problem.
description: A&A accepted
title: Analysis of FEMA Guidelines for Coastal Dunes Using a Numerical Model
Creators: name: Payne, Brenton Edward
Publisher: name: Old Dominion University Libraries
Year: 2010

description: FEMA's current guideline for coastal dune erosion is called the 540 Rule. The intent of the 540 Rule is to act as a boolean guideline for dune protection. If a dune is validated as being substantial against the 1 % Annual Chance Storm Water Elevation Level by the 540 Rule, then the area behind the dune is considered to be susceptible to less energetic flooding. This is known as an AE Flood Zone. An immediate effect of being rezoned is a significant drop in the insurance costs behind the dune. However, if the dune is not validated by the 540 Rule, then it is assumed that the dune is not substantial enough to protect the area behind the dune, and this area therefore is labeled as a VE Zone. Under a VE Zone, construct requirements are considerably stricter, and existing structures will have a significantly higher flood insurance rate than if they were zoned as AE.

The one dimensional cross-shore beach change model known as SBEACH was selected to test the 540 Rule. Five severe storms were modified to be the 1 % annual chance SWEL for two beach profiles provided by FEMA. The PFD of one beach profile is about 20% greater than 540 ft3 /ft, and the other profile is about 20% less than 540 ft3 /ft. The FEMA beach profiles were not detailed enough offshore and were modified using data from the nearby U.S. Army Corps of Engineers Field Research Facility.

The results of the simulation concluded that the five storms applied to the two beach profiles all performed within the definition of the 540 Rule. Of particular importance, the dune which the 540 Rule defines as an effective barrier against the 1 % Annual Chance Storm Water Elevation Level never eroded beyond the dune heel. Therefore, in this study, the 540 Rule is found to be an appropriate means of primary frontal dune evaluation.
Stellar Ages through the Corners of the Boxy Bulge
Creators: name: Valenti, E.
name: Zoccali, M.
name: Renzini, A.
name: Brown, T. M.
name: Gonzalez, O.
name: Minniti, D.
name: Debattista, Victor P.
name: Mayer, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In some scenarios for the formation of the Milky Way bulge the stellar population at the edges of the boxy bulge may be younger than those on the minor axis, or close to the Galactic center. So far the only bulge region where deep color-magnitude diagrams have been obtained is indeed along the minor axis. To overcome this limitation, we aim at age-dating the bulge stellar populations far away from the bulge minor axis. Color-magnitude diagrams and luminosity functions have been obtained from deep near-IR VLT/HAWK-I images taken at the two Southern corners of the boxy bulge, i.e., near the opposite edges of the Galactic bar. The foreground disk contamination has been statistically removed using a pure disk field observed with the same instrument and located approximately at similar Galactic latitudes of the two bulge fields, and 30deg in longitude away from the Galactic center. For each bulge field, mean reddening and distance are determined using the position of red clump stars, and the metallicity distribution is derived photometrically using the color distribution of stars in the upper red giant branch. The resulting metallicity distribution function of both fields peaks around [Fe/H] -0.1 dex, with the bulk of the stellar population having a metallicity within the range: -1 dex < [Fe/H]
description: 10 pages, 10 figures, accepted for publication on A&A
Monmouth University Poll: February 2016 Virginia Primary
Creators: name: Monmouth University Polling Institute
Publisher: name: Roper Center for Public Opinion Research
Year: 2022

description: Registered to vote (1); voter likelihood (1); Republican/Democratic presidential primary (2); Republican presidential primary candidates (5); would/would not be happy if candidate won (2); Democratic presidential primary candidates (3); Former Secretary of State Hillary Clinton/Senator Bernie Sanders on concerns of families like yours (2).
Testing the thermal Sunyaev-Zel'dovich power spectrum of a halo model using hydrodynamical simulations
Creators: name: Ayçoberry, Emma
name: S., Pranjal R.
name: Benabed, Karim
name: Dubois, Yohan
name: Krause, Elisabeth
name: Eifler, Tim
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Statistical properties of LSS serve as powerful tools to constrain the cosmological properties of our Universe. Tracing the gas pressure, the tSZ effect is a biased probe of mass distribution and can be used to test the physics of feedback or cosmological models. Therefore, it is crucial to develop robust modeling of hot gas pressure for applications to tSZ surveys. Since gas collapses into bound structures, it is expected that most of the tSZ signal is within halos produced by cosmic accretion shocks. Hence, simple empirical halo models can be used to predict the tSZ power spectra. In this study, we employed the HMx halo model to compare the tSZ power spectra with those of several hydrodynamical simulations: the Horizon suite and the Magneticum simulation. We examined various contributions to the tSZ power spectrum across different redshifts, including the one- and two-halo term decomposition, the amount of bound gas, the importance of different masses and the electron pressure profiles. Our comparison of the tSZ power spectrum reveals discrepancies that increase with redshift. We find a 20% to 50% difference between the measured and predicted tSZ angular power spectrum over the multipole range $\ell=10^3-10^4$. Our analysis reveals that these differences are driven by the excess of power in the predicted two-halo term at low k and in the one-halo term at high k. At higher redshifts (z~3), simulations indicate that more power comes from outside the virial radius than from inside suggesting a limitation in the applicability of the halo model. We observe differences in the pressure profiles, despite the fair level of agreement on the tSZ power spectrum at low redshift with the default calibration of the halo model. In conclusion, our study suggests that the properties of the halo model need to be carefully controlled against real or mock data to be proven useful for cosmological purposes.
description: 14 pages, 9 figures
Rate of convergence for periodic homogenization of convex Hamilton-Jacobi equations in one dimension
Creators: name: Tu, Son N. T.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B40, 37J50, 49L25

description: Let $u^\varepsilon$ and $u$ be viscosity solutions of the oscillatory Hamilton-Jacobi equation and its corresponding effective equation. Given bounded, Lipschitz initial data, we present a simple proof to obtain the optimal rate of convergence $\mathcal{O}(\varepsilon)$ of $u^\varepsilon \rightarrow u$ as $\varepsilon \rightarrow 0^+$ for a large class of convex Hamiltonians $H(x,y,p)$ in one dimension. This class includes the Hamiltonians from classical mechanics with separable potential. The proof makes use of optimal control theory and a quantitative version of the ergodic theorem for periodic functions in dimension $n = 1$.
description: 23 pages, fixed an error in the statement of Lemma 2.8 from the previous version (results are unaffected)
Seismic Facies Analysis: A Deep Domain Adaptation Approach
Creators: name: Nasim, M Quamer
name: Maiti, Tannistha
name: Srivastava, Ayush
name: Singh, Tarry
name: Mei, Jie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Deep neural networks (DNNs) can learn accurately from large quantities of labeled input data, but often fail to do so when labelled data are scarce. DNNs sometimes fail to generalize ontest data sampled from different input distributions. Unsupervised Deep Domain Adaptation (DDA)techniques have been proven useful when no labels are available, and when distribution shifts are observed in the target domain (TD). In the present study, experiments are performed on seismic images of the F3 block 3D dataset from offshore Netherlands (source domain; SD) and Penobscot 3D survey data from Canada (target domain; TD). Three geological classes from SD and TD that have similar reflection patterns are considered. A deep neural network architecture named EarthAdaptNet (EAN) is proposed to semantically segment the seismic images when few classes have data scarcity, and we use a transposed residual unit to replace the traditional dilated convolution in the decoder block. The EAN achieved a pixel-level accuracy >84% and an accuracy of ~70% for the minority classes, showing improved performance compared to existing architectures. In addition, we introduce the CORAL (Correlation Alignment) method to the EAN to create an unsupervised deep domain adaptation network (EAN-DDA) for the classification of seismic reflections from F3 and Penobscot, to demonstrate possible approaches when labelled data are unavailable. Maximum class accuracy achieved was ~99% for class 2 of Penobscot, with an overall accuracy>50%. Taken together, the EAN-DDA has the potential to classify target domain seismic facies classes with high accuracy.
description: 22 pages, 13 figures, 5 tables, and supplementary material included in the end of the paper
title: Tax Barden on the Enterprise in Ukraine
Creators: name: Sytnyk, Nataliya
name: Sych, Olga
Publisher: name: E-Wydawnictwo. Prawnicza i Ekonomiczna Biblioteka Cyfrowa. Wydział Prawa, Administracji i Ekonomii Uniwersytetu Wrocławskiego
Year: 2020

description: The main purpose of the article is to exam the level of the tax burden on the enterprise, in terms of the impact of this indicator on the financial condition of the entity. For the purpose of this analysis, the data of Ukrainian company were selected, the number of indicators were evaluated, their elasticity and correlation were discussed. Two proposals were developed to decrease the amount of taxes that company payed.
Hadwiger's conjecture for 3-arc graphs
Creators: name: Wood, David R.
name: Xu, Guangjun
name: Zhou, Sanming
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: The 3-arc graph of a digraph $D$ is defined to have vertices the arcs of $D$ such that two arcs $uv, xy$ are adjacent if and only if $uv$ and $xy$ are distinct arcs of $D$ with $v\ne x$, $y\ne u$ and $u,x$ adjacent. We prove that Hadwiger's conjecture holds for 3-arc graphs.
NOMA-Based Cooperative Relaying with Receive Diversity in Nakagami-m Fading Channels
Creators: name: Kumar, Vaibhav
name: Cardiff, Barry
name: Flanagan, Mark F
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Non-orthogonal multiple access (NOMA) is being widely considered as a potential candidate to enhance the spectrum utilization in beyond fifth-generation (B5G) communications. In this paper, we derive closed-form expressions for the ergodic rate and outage probability of a multiple-antenna-assisted NOMA-based cooperative relaying system (CRS-NOMA). We present the performance analysis of the system for two different receive diversity schemes - selection combining (SC) and maximal-ratio combining (MRC), in Nakagami-m fading. We also evaluate the asymptotic behavior of the CRS-NOMA to determine the slope of the ergodic rate and diversity order. Our results show that in contrast to the existing CRS-NOMA systems, the CRS-NOMA with receive diversity outperforms its orthogonal multiple access (OMA) based counterpart even in the low-SNR regime, by achieving higher ergodic rate. Diversity analysis confirms that the CRS-NOMA achieves full diversity order using both SC and MRC schemes, and this diversity order depends on both the shape parameter m and the number of receive antennas. We also discuss the problem of optimal power allocation for the minimization of the outage probability of the system, and subsequently use this optimal value to obtain the ergodic rate. An excellent match is observed between the numerical and the analytical results, confirming the correctness of the derived analytical expressions.
description: 15 pages, 8 figures
Flore d'Afrique centrale - Spermatophyta - Balanophoraceae
Creators: name: Staner, P.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Balanophoraceae in Flore d'Afrique centrale series
Rotation Measure study of FRB 20180916B with the uGMRT
Creators: name: Bethapudi, S.
name: Spitler, L. G.
name: Li, D. Z.
name: Marthi, V. R.
name: Bause, M.
name: Main, R. A.
name: Wharton, R. S.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. Fast Radio Burst 20180916B is a repeating FRB whose activity window has a 16.34 day periodicity that also shifts and varies in duration with the observing frequency. Recently, arxiv:2205.09221 reported the FRB has started to show secular Rotation Measure (RM) increasing trend after only showing stochastic variability around a constant value of $-114.6$ rad m$^{-2}$ since its discovery.
 Aims. We aim to further study the RM variability of FRB 20180916B. The data comes from the ongoing campaigns of FRB 20180916B using the upgraded Giant Metrewave Radio Telescope (uGMRT). The majority of the observations are in Band 4, which is centered at 650 MHz with 200 MHz bandwidth.
 Methods. We apply a standard single pulse search pipeline to search for bursts. In total, we detect 116 bursts with $\sim$36 hours of on-source time spanning 1200 days, with two bursts detected during simultaneous frequency coverage observations. We develop and apply a polarization calibration strategy suited for our dataset. On the calibrated bursts, we use QU-fitting to measure RM. Lastly, we also measure various other properties such as rate, linear polarization fraction and fluence distribution.
 Results. Of the 116 detected bursts, we could calibrate 79 of them. From which, we observed in our early observations the RM continued to follow linear trend as modeled by arxiv:2205.09221. However, our later observations suggest the source switch from the linear trend to stochastic variations around a constant value of $-58.75$ rad m$^{-2}$. We also study cumulative rate against fluence and note that rate at higher fluences (> 1.2 Jy ms) scales as $γ= -1.09(7)$ whereas that at lower fluences (between 0.2 and 1.2 Jy ms) only scales as $γ= -0.51(1)$, meaning rate at higher fluence regime is steeper than at lower fluence regime.
description: abstract abridged, 11 pages, 8 figures, comments welcome
Optical conductivity, Drude weight and plasmons in twisted graphene bilayers
Creators: name: Stauber, Tobias
name: San-Jose, Pablo
name: Brey, Luis
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We numerically calculate the optical conductivity of twisted graphene bilayers within the continuum model. To obtain the imaginary part, we employ the regularized Kramers-Kronig relation allowing us to discuss arbitrary twist angles, chemical potential and temperature. We find that the Drude weight $D$ as function of the chemical potential $μ$ closely follows the shell structure of twisted bilayer displayed by the density of states. For certain angles, this results in a transport gap D=0 at finite $μ$. We also discuss the loss function which, for low doping, is characterized by acoustic interband "plasmons" and transitions close to the van Hove singularities. For larger doping, the plasmon mode of decoupled graphene bilayer is recovered that is damped especially for small wave numbers.
description: 21 pages. 8 figures
Dispersive analysis of the isospin breaking in the $X(3872)~\to~J/ψπ^+π^-$ and $X(3872)~\to~J/ψπ^+π^0π^-$ decays
Creators: name: Dias, Jorgivan Morais
name: Ji, Teng
name: Dong, Xiang-Kun
name: Guo, Feng-Kun
name: Hanhart, Christoph
name: Meißner, Ulf-G.
name: Zhang, Yu
name: Zhang, Zhen-Hua
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We analyze the latest LHCb data on the $π^+π^-$ spectrum in the isospin-violating $X(3872)\to J/ψπ^+π^-$ decay, based on dispersion theory to deal with the $ππ$ final state interactions. Additionally, the isospin breaking effects are properly introduced, allowing for a reliable and accurate extraction of the ratio, $R_X$, between the $X(3872)$ couplings to the $J/ψρ$ and $J/ψω$ channels from the data. We find very good agreement with the LHCb data for the whole range of the $π^+π^-$ invariant mass, and $R_X$ is determined to be {$0.26\pm 0.03$}. Using this value, we make predictions for the $π^+π^0π^-$ mass distribution in the $X(3872)\to J/ψπ^+π^0π^-$ process, which is currently accessible by the BESIII Collaboration, and update a prediction for the pole positions of the isovector partner states of the $X(3872)$, $W_{c1}$, with $I(J^{PC})=1(1^{++})$.
description: 9 pages, 1 table and 2 figures. Version to be published in Phys. Rev. D; results updated with a mistake on the rho-omega mixing corrected and a new appendix explaining how the mixing was obtained
Mutual synchronization of two stacks of intrinsic Josephson junctions in cuprate superconductors
Creators: name: Lin, Shi-Zeng
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Certain high-$T_c$ cuprate superconductors, which naturally realize a stack of Josephson junctions, thus can be used to generate electromagnetic waves in the terahertz region. A plate-like single crystal with $10^4$ junctions without cavity resonance was proposed to achieve strong radiation. For this purpose, it is required to synchronize the Josephson plasma oscillation in all junctions. In this work, we propose to use two stacks of junctions shunted in parallel to achieve synchronization. The two stacks are mutually synchronized in the whole IV curve, and there is a phase shift between the plasma oscillation in the two stacks. The phase shift is nonzero when the number of junctions in different stacks is the same, while it can be arbitrary when the number of junctions is different. This phase shift can be tuned continuously by applying a magnetic field when all the junctions are connected by superconducting wires.
description: 6.2 pages and 4 figures
Persistent Backdoor Attacks in Continual Learning
Creators: name: Guo, Zhen
name: Kumar, Abhinav
name: Tourani, Reza
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Backdoor attacks pose a significant threat to neural networks, enabling adversaries to manipulate model outputs on specific inputs, often with devastating consequences, especially in critical applications. While backdoor attacks have been studied in various contexts, little attention has been given to their practicality and persistence in continual learning, particularly in understanding how the continual updates to model parameters, as new data distributions are learned and integrated, impact the effectiveness of these attacks over time. To address this gap, we introduce two persistent backdoor attacks-Blind Task Backdoor and Latent Task Backdoor-each leveraging minimal adversarial influence. Our blind task backdoor subtly alters the loss computation without direct control over the training process, while the latent task backdoor influences only a single task's training, with all other tasks trained benignly. We evaluate these attacks under various configurations, demonstrating their efficacy with static, dynamic, physical, and semantic triggers. Our results show that both attacks consistently achieve high success rates across different continual learning algorithms, while effectively evading state-of-the-art defenses, such as SentiNet and I-BAU.
description: 18 pages, 15 figures, 6 tables
Comments on the holographic description of Narain theories
Creators: name: Dymarsky, Anatoly
name: Shapere, Alfred
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Information Theory (cs.IT)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We discuss the holographic description of Narain $U(1)^c\times U(1)^c$ conformal field theories, and their potential similarity to conventional weakly coupled gravity in the bulk, in the sense that the effective IR bulk description includes "$U(1)$ gravity" amended with additional light degrees of freedom. Starting from this picture, we formulate the hypothesis that in the large central charge limit the density of states of any Narain theory is bounded by below by the density of states of $U(1)$ gravity. This immediately implies that the maximal value of the spectral gap for primary fields is $Δ_1=c/(2πe)$. To test the self-consistency of this proposal, we study its implications using chiral lattice CFTs and CFTs based on quantum stabilizer codes. First we notice that the conjecture yields a new bound on quantum stabilizer codes, which is compatible with previously known bounds in the literature. We proceed to discuss the variance of the density of states, which for consistency must be vanishingly small in the large-$c$ limit. We consider ensembles of code and chiral theories and show that in both cases the density variance is exponentially small in the central charge.
description: v2, journal version with typos corrected