cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Benchmarking the cosmological master equations
Creators: name: Colas, Thomas
name: Grain, Julien
name: Vennin, Vincent
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Master equations are commonly employed in cosmology to model the effect of additional degrees of freedom, treated as an "environment", onto a given "system". However, they rely on assumptions that are not necessarily satisfied in cosmology, where the environment may be out of equilibrium and the background is dynamical. In this work, we apply the master-equation program to a model that is exactly solvable, and which consists of two linearly coupled scalar fields evolving on a cosmological background. The light field plays the role of the system and the heavy field is the environment. By comparing the exact solution to the output of the master equation, we can critically assess its performance. We find that the master equation exhibits a set of "spurious" terms that explicitly depend on the initial conditions, and which arise as a consequence of working on a dynamical background. Although they cancel out in the perturbative limit of the theory (i.e. at leading orders in the interaction strength), they spoil resummation. However, when those terms are removed, the master equation performs impressively well to reproduce the power spectra and the amount of the decoherence of the light field, even in the strongly decohered regime. We conclude that master equations are able to perform late-time resummation, even though the system is far from the Markovian limit, provided spurious contributions are suppressed.
description: 25 pages without appendices (48 pages in total), 5 figures, matches published version in EPJC
Giant exchange bias in a single-phase magnet with two magnetic sublattices
Creators: name: Sun, Young
name: Cong, Junzhuang
name: Chai, Yisheng
name: Yan, Liqin
name: Zhao, Yuelei
name: Wang, Shouguo
name: Ning, Wei
name: Zhang, Yuheng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Exchange bias phenomenon is generally ascribed to the exchange coupling at the interfaces between ferromagnetic and antiferromagnetic layers. Here, we propose a bulk form of exchange bias in a single-phase magnet where the coupling between two magnetic sublattices induces a significant shift of the coercive field after a field cooling. Our experiments in a complicated magnet YbFe2O4 demonstrate a giant exchange bias at low temperature when the coupling between the Yb3+ and Fe2+/Fe3+ sublattices take places. The cooling magnetic field dependence and the training effect of exchange bias are consistent with our model. In strong contrast to conventional interfacial exchange bias, this bulk form of exchange bias can be huge, reaching the order of a few Tesla.
description: 17 pages, 6 figures
On Guiding Search in HTN Temporal Planning with non Temporal Heuristics
Creators: name: Cavrel, Nicolas
name: Pellier, Damien
name: Fiorino, Humbert
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The Hierarchical Task Network (HTN) formalism is used to express a wide variety of planning problems as task decompositions, and many techniques have been proposed to solve them. However, few works have been done on temporal HTN. This is partly due to the lack of a formal and consensual definition of what a temporal hierarchical planning problem is as well as the difficulty to develop heuristics in this context. In response to these inconveniences, we propose in this paper a new general POCL (Partial Order Causal Link) approach to represent and solve a temporal HTN problem by using existing heuristics developed to solve non temporal problems. We show experimentally that this approach is performant and can outperform the existing ones.
Enhanced pair-correlation functions in the two-dimensional Hubbard model
Creators: name: Yanagisawa, Takashi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this study we have computed the pair correlation functions in the two-dimensional Hubbard model using a quantum Monte Carlo method. We employ a new diagonalization algorithm in quantum Monte Carlo method which is free from the negative sign problem. We show that the d-wave pairing correlation function is indeed enhanced slightly for the positive on-site Coulomb interaction U when doping away from the half-filling. When the system size becomes large, the pair correlation function P_d is increased for U>0 compared to the non-interacting case, while P_d is suppressed for U>0 when the system size is small. The enhancement ratio P_d[U]/P_d[U=0] will give a criterion on the existence of superconductivity. The ratio P_d[U]/P_d[U=0] increases almost linearly \propto L as the system size L\times L is increased. This increase is a good indication of an existence of superconducting phase in the two-dimensional Hubbard model. There is, however, no enhancement of pair correlation functions at half-filling, which indicates the absence of superconductivity without hole doping.
description: arXiv admin note: substantial text overlap with arXiv:0707.1929
Non-stationary effects in the coupled quantum dots influenced by the electron-phonon interaction
Creators: name: Mantsevich, V. N.
name: Maslova, N. S.
name: Arseyev, P. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyzed time evolution of the localized charge in the system of two interacting single level quantum dots (QDs) coupled with the continuous spectrum states in the presence of electron-phonon interaction. We demonstrated that electron-phonon interaction leads to the increasing of localized charge relaxation rate. We also found that several time scales with different relaxation rates appear in the system in the case of non-resonant tunneling between the dots. We revealed the formation of oscillations in the filling numbers time evolution caused by the emission and adsorption processes of phonons.
description: 6 pages, 2 figures
Solving a problem with a single parameter: A smooth bcc to fcc phase transition for metallic lithium
Creators: name: Jerabek, Paul
name: Burrows, Anthony
name: Schwerdtfeger, Peter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Density functional calculations for metallic lithium along a cuboidal bcc-to-fcc transformation path demonstrate that the bcc phase is quasi-degenerate with the fcc phase with a very small activation barrier of 0.1~kJ/mol, but becomes the dominant phase at higher temperatures in accordance with Landau theory. This resolves the long-standing controversy about the two phases for lithium.
description: 8 pages, 6 figures
title: Wilhelm Albert von Brunn: Mitteldeutsche Hortfunde der jüngeren Bronzezeit. Römisch-Germanische Forschungen Bd. 29. Berlin 1968
Creators: name: Kimmig, Wolfgang
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Wilhelm Albert von Brunn: Mitteldeutsche Hortfunde der jüngeren Bronzezeit. Römisch-Germanische Forschungen Bd. 29. Verlag Walter de Gruyter, Berlin 1968. Textband IX, 381 Seiten, 5 Tabellen, 15 Abbildungen und 1 Beilage; Tafelband IV, 204 Tafeln und 22 Karten.
Magnetic proximity effect at the 3D topological insulator/magnetic insulator interface
Creators: name: Eremeev, S. V.
name: Men'shov, V. N.
name: Tugushev, V. V.
name: Echenique, P. M.
name: Chulkov, E. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The magnetic proximity effect is a fundamental feature of heterostructures composed of layers of topological insulators and magnetic materials since it underlies many potential applications in devices with novel quantum functionality. Within density functional theory we study magnetic proximity effect at the 3D topological insulator/magnetic insulator (TI/MI) interface in Bi$_2$Se$_3$/MnSe(111) system as an example. We demonstrate that a gapped ordinary bound state which spectrum depends on the interface potential arises in the immediate region of the interface. The gapped topological Dirac state also arises in the system owing to relocation to deeper atomic layers of topological insulator. The gap in the Dirac cone is originated from an overlapping of the topological and ordinary interfacial states. This result being also corroborated by the analytic model, is a key aspect of the magnetic proximity effect mechanism in the TI/MI structures.
description: 10 pages, 3 figures
title: Ernst Penninger: Der Dürrnberg bei Hallein I. Katalog der Grabfunde aus der Hallstatt- und Latènezeit, Erster Teil. München 1972
Creators: name: Fischer, Franz
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Ernst Penninger: Der Dürrnberg bei Hallein I. Katalog der Grabfunde aus der Hallstatt- und Latènezeit, Erster Teil. Unter Mitarbeit von L. Pauli, mit Beiträgen von H . Hirschhuber, J. Riederer und W. Specht. Veröffentlichung der Kommission zur archäologischen Erforschung des spätrömischen Raetien der Bayerischen Akademie der Wissenschaften. Münchner Beiträge zur Vor- und Frühgeschichte, Band 16. C. H . Beck'sche Verlagsbuchhandlung, München 1972. 128 Seiten, 16 Abbildungen und 16 Tafeln im Text und 120 Tafeln und 2 Kartenbeilagen.
Automating Microservices Test Failure Analysis using Kubernetes Cluster Logs
Creators: name: Sarika, Pawan Kumar
name: Badampudi, Deepika
name: Josyula, Sai Prashanth
name: Usman, Muhammad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Kubernetes is a free, open-source container orchestration system for deploying and managing Docker containers that host microservices. Kubernetes cluster logs help in determining the reason for the failure. However, as systems become more complex, identifying failure reasons manually becomes more difficult and time-consuming. This study aims to identify effective and efficient classification algorithms to automatically determine the failure reason. We compare five classification algorithms, Support Vector Machines, K-Nearest Neighbors, Random Forest, Gradient Boosting Classifier, and Multilayer Perceptron. Our results indicate that Random Forest produces good accuracy while requiring fewer computational resources than other algorithms.
On ground state (in-)stability in multi-dimensional cubic-quintic Schrödinger equations
Creators: name: Carles, Rémi
name: Klein, Christian
name: Sparber, Christof
Publisher: name: University of Illinois at Chicago
Year: 2023
Subjects: Uncategorized

description: We consider the nonlinear Schrödinger equation with a focusing cubic term and a defocusing quintic nonlinearity in dimensions two and three. The main interest of this article is the problem of orbital (in-)stability of ground state solitary waves. We recall the notions of energy minimizing versus action minimizing ground states and prove that, in general, the two must be considered as nonequivalent. We numerically investigate the orbital stability of least action ground states in the radially symmetric case, confirming existing conjectures or leading to new ones.
Role of Bulk flow in Turbulent Convection
Creators: name: Verma, Mahendra K.
name: Pandey, Ambrish
name: Mishra, Pankaj K.
name: Chandra, Mani
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In this paper we present scaling of large-scale quantities like Peclét and Nusselt numbers, and the dissipation rates of kinetic energy and entropy. Our arguments are based on the scaling of bulk quantities and earlier experimental and simulation results. We also present the inertial-range properties of spectra and fluxes of kinetic energy and entropy.
description: 15 pages, to Appear in the proceedings of "Senfest, International Conference on Complex Processes in Plasmas and Nonlinear Dynamical Systems"
Short documentary edited from the footage from Neuhaus working on sound project outdoors and urban locations
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Sound in art
Emergency vehicles
Sirens (signaling devices)
Emergency vehicles--Safety measures
Sound--Experiments

description: This is a short documentary about Neuhaus and the siren redesign project edited from the footage from items in Box 19 and Box 20. No titles or credits.
Wave-Supported Hybrid Fast-Thermal p-$^{11}$B Fusion
Creators: name: Kolmes, E. J.
name: Ochs, I. E.
name: Fisch, N. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The possibility of fusion ignition in proton-Boron$^{11}$ plasma is strongly enhanced if the energy from the fusion-produced $α$ particles is channeled to fast protons, but in an environment in which most of the protons are thermally distributed. This hybrid of thermonuclear fusion and beam-plasma fusion offers surprisingly large advantages to either purely thermonuclear or purely beam-plasma fusion, neither of which can by themselves significantly exceed the large bremsstrahlung radiation emitted by the proton-Boron$^{11}$ plasma. The hybrid scheme has the potential to reduce the confinement time of the reactants that is required to achieve ignition by an order of magnitude.
description: 6 pages, 3 figures
Using novel sequence assembly strategies to resolve the transformer gene family
Creators: name: Wilkins, Glen Tristan
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Transformer (Trf; formerly 185/333) is an immune-related multigene family found exclusively in sea urchins. Empirical experiments have shown Trf to be unusually diversified in Strongylocentrotus purpuratus (SpTrf), with its genome encoding an estimated 80-120 alleles. However, the published S. purpuratus genome assembly contained only 2 Trf genes, with successive revisions raising that number to 6. This major discrepancy has plagued the study of SpTrf, making experimental findings difficult to interpret. In this thesis I develop bioinformatic tools and methods aimed to resolve problematic genomic loci with demonstrable confidence. These tools include novel algorithms to efficiently index and query large raw sequencing datasets, allowing the tools to be run on a desktop computer with minimal memory use. I then use these methods to resolve Trf in the local sea urchin Heliocidaris tuberculata (HtTrf), to find its genome encodes only four such genes in a single cluster. In the process, I uncover an experimental artefact in the methods used to characterize SpTrf diversity that would dramatically inflate perceived diversity when applied to HtTrf. Combined, these findings imply that SpTrf may have been substantially mischaracterized as a hypervariable gene family. To revise and expand current understanding of Trf, I characterize Trf genes in a wide variety of sea urchin species, most of which were previously unstudied. As part of this process, I resolve SpTrf to be far less numerous (15 alleles possessed by an individual) than empirically estimated, but still misrepresented in genome assemblies. The survey of species reveals a clear phylogenetic division where all 19 echinidean species possessed Trf, while all non-echinideans did not - implying the relatively recent de novo evolution of Trf in a common ancestor of echinideans. In each echinidean species, Trf is a multigene family, but sequence similarity is unexpectedly high among paralogs. This lack of divergence among paralogs appears to be explained by the arrangement of Trf genes in genomic clusters, where evidence of frequent duplications, deletions and gene conversion events can be observed. These observations fit with Trf being a multigene family that evolves by concerted evolution, where gene conversion acts to homogenize paralogs. Overall, this thesis serves to identify and resolve the mischaracterization of Trf genes, culminating in a comprehensive investigation into Trf diversity and evolution. It also represents a case study in how multigene families can be misrepresented in sequence assembly and how targeted analysis methods can provide a high-confidence resolution.
title: Hansörg Kellner: Die Römer in Bayern. München 1971
Creators: name: Unz, Christoph
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Hansörg Kellner: Die Römer in Bayern. Süddeutscher Verlag, München 1971. 219 Seiten, 179 Abbildungen auf Tafeln, 65 Textabbildungen.
Characterization of InSb quantum wells with atomic layer deposited gate dielectrics
Creators: name: Uddin, M. M.
name: Liu, H. W.
name: Yang, K. F.
name: Nagase, K.
name: Mishima, T. D.
name: Santos, M. B.
name: Hirayama, Y.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report magnetotransport measurements of a gated InSb quantum well (QW) with high quality Al2O3 dielectrics (40 nm thick) grown by atomic layer deposition. The magnetoresistance data demonstrate a parallel conduction channel in the sample at zero gate voltage (Vg). A good interface between Al2O3 and the top InSb layer ensures that the parallel channel is depleted at negative Vg and the density of two-dimensional electrons in the QW is tuned by Vg with a large ratio of 6.5x1014 m-2V-1 but saturates at large negative Vg. These findings are closely related to layer structures of the QW as suggested by self-consistent Schrodinger-Poisson simulation and two-carrier model.
description: 11 pages,3 figures
Additional computational files of Tunable Macrocyclic Polyparaphenylene Nanolassos via Copper-free Click Chemistry
Creators: name: Yang, Wudi
name: Zhang, Lina
name: Dral, Pavlo O.
Publisher: name: figshare
Year: 2022
Subjects: Computational chemistry

description: We provide additional raw data containing XYZ coordinates of all optimized species, archive files of Gaussian calculations as well as an Excel spreadsheet file with energies and charges
Vortex Structures and Momentum Sharing in Dynamic Sauter-Schwinger Process
Creators: name: Bechler, A.
name: Vélez, F. Cajiao
name: Krajewska, K.
name: Kamiński, J. Z.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Vortex pattern formation in electron-positron pair creation from vacuum by a time-dependent electric field of linear polarization is analyzed. It is demonstrated that in such scenario the momentum distributions of created particles exhibit vortex-antivortex pairs. Their sensitivity to the laser field parameters such as the field frequency and intensity is also studied. Specifically, it is shown that with increasing field frequency accross the one-photon threshold additional vortex-antivortex pairs appear. Their location in the momentum space is consistent with a general threshold behavior of probability distributions of created electrons (positrons). Namely, while for small field frequencies the particles tend to be created along the field polarization direction, for large enough frequencies they are predominantly generated in the perpendicular direction. Such change in longitudinal and transverse momentum sharing of created particles occurs accross the one-photon threshold.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
Large-scale radio continuum properties of 19 Virgo cluster galaxies The influence of tidal interactions, ram pressure stripping, and accreting gas envelopes
Creators: name: Vollmer, B.
name: Soida, M.
name: Beck, R.
name: Chung, A.
name: Urbanik, M.
name: Chyzy, K. T.
name: Otmianowska-Mazur, K.
name: Kenney, J. D. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Deep scaled array VLA 20 and 6cm observations including polarization of 19 Virgo spirals are presented. This sample contains 6 galaxies with a global minimum of 20cm polarized emission at the receding side of the galactic disk and quadrupolar type large-scale magnetic fields. In the new sample no additional case of a ram-pressure stripped spiral galaxy with an asymmetric ridge of polarized radio continuum emission was found. In the absence of a close companion, a truncated HI disk, together with a ridge of polarized radio continuum emission at the outer edge of the HI disk, is a signpost of ram pressure stripping. 6 out of the 19 observed galaxies display asymmetric 6cm polarized emission distributions. Three galaxies belong to tidally interacting pairs, two galaxies host huge accreting HI envelopes, and one galaxy had a recent minor merger. Tidal interactions and accreting gas envelopes can lead to compression and shear motions which enhance the polarized radio continuum emission. In addition, galaxies with low average star formation rate per unit area have a low average degree of polarization. Shear or compression motions can enhance the degree of polarization. The average degree of polarization of tidally interacting galaxies is generally lower than expected for a given rotation velocity and star formation activity. This low average degree of polarization is at least partly due to the absence of polarized emission from the thin disk. Ram pressure stripping can decrease whereas tidal interactions most frequently decreases the average degree of polarization of Virgo spiral galaxies. We found that moderate active ram pressure stripping has no influence on the spectral index, but enhances the global radio continuum emission with respect to the FIR emission, while an accreting gas envelope can but not necessarily enhances the radio continuum emission with respect to the FIR emission.
description: 37 pages, 26 figures, accepted for publication in A&A
Neuhaus working on sound project in urban location
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Sound in art
Emergency vehicles
Sirens (signaling devices)
Emergency vehicles--Safety measures
Sound--Experiments

description: Neuhaus working on the siren redesign project in urban location, involving cars with speakers driving around. Includes footage of Neuhaus giving instructions to drivers
Phonon coupling effects in magnetic moments of magic and semi-magic nuclei
Creators: name: Saperstein, E. E.
name: Achakovskiy, O.
name: Kamerdzhiev, S.
name: Krewald, S.
name: Speth, J.
name: Tolokonnikov, S. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Phonon coupling (PC) corrections to magnetic moments of odd neighbors of magic and semi-magic nuclei are analyzed within the self-consistent Theory of Finite Fermi Systems (TFFS) based on the Energy Density Functional by Fayans et al. The perturbation theory in g_L^2 is used where g_L is the phonon-particle coupling vertex. A model is developed with separating non-regular PC contributions, the rest is supposed to be regular and included into the standard TFFS parameters. An ansatz is proposed to take into account the so-called tadpole term which ensures the total angular momentum conservation with g_L^2 accuracy. An approximate method is suggested to take into account higher order terms in g_L^2. Calculations are carried out for four odd-proton chains, the odd Tl, Bi, In and Sb ones. Different PC corrections strongly cancel each other. In the result, the total PC correction to the magnetic moment in magic nuclei is, as a rule, negligible. In non-magic nuclei considered it is noticeable and, with only one exception, negative. On average it is of the order of -(0.1 - 0.5) μ_N and improves the agreement of the theory with the data. Simultaneously we calculated the gyromagnetic ratio g_L^{ph} of all low-lying phonons in 208Pb. For the 3^-_1 state it is rather close to the Bohr-Mottelson model prediction whereas for other L-phonons, two 5^- and six positive parity states, the difference from the Bohr-Mottelson values is significant.
description: 21 pages, 24 figures
Arrival time in quantum mechanics (demonstrated in geometrical order)
Creators: name: Kijowski, Jerzy
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A geometric construction of the arrival time in conventional quantum mechanics is presented. It is based on a careful mathematical analysis of different quantization procedures for classical observables as functions of positions and momenta. A class of observables is selected which possess a unique (if any) quantized version. A simple criterion for existence of such a quantized version is formulated. These mathematical results are then applied to the classical "arrival time" observable.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
Additional computational files of Tuning the Properties of Macrocyclic Poplyparaphenylene Nanolassos via Copper-free Click Chemistry
Creators: name: Yang, Wudi
name: Zhang, Lina
name: Dral, Pavlo O.
Publisher: name: figshare
Year: 2022

description: We provide additional raw data containing XYZ coordinates of all optimized species, archive files of Gaussian calculations as well as an Excel spreadsheet file with energies and charges
Limits on the source properties of FR-I galaxies from high-energy neutrino and gamma observations
Creators: name: Saba, Isaac
name: Tjus, Julia Becker
name: Halzen, Francis
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Active galactic nuclei (AGN) are believed to be the source of ultra high energy cosmic rays (UHECRs). Particles are assumed to be accelerated in the accretion disk and the plasma jets, produced due to conservation of angular momentum, to the highest energies, where they interact with each other and produce pions, which decay among others in neutrinos. For a known cosmic ray spectral behavior, the main parameters in the calcula- tion of the neutrino flux from proton-proton interactions are the target density nH and the ratio of electrons to protons fe . Using most recent neutrino flux limits from IceCube point source searches, we set limits on the target densities for 33 FR-I galaxies. The densities are shown to be smaller than 30 cm^{-3} to 2000 cm^{-3}, depending on the source and when using a fixed electron to proton ratio of f_{e} = 0.1. This implies that some cosmic ray acceleration sites, espe- cially those close to the core of the AGN, can already be excluded, or else that the ratio of electrons to protons deviates significantly from the commonly used value of 0.1. For Centaurus A (Cen A) and Messier 87 (M 87) we use Fermi observations to model the γ-flux, the neutrino flux and the resulting target density. The detec- tion of these neutrinos will help to find information about acceleration processes in the source.
Neuhaus working on sound project outdoors
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Sound in art
Emergency vehicles
Sirens (signaling devices)
Emergency vehicles--Safety measures
Sound--Experiments

description: Neuhaus working on sound project outdoors, related to the siren redesign project; rocky desert location, presumably somewhere in American West; includes footage of driving to various locations and talking to camera about his work.
Quantum metamaterial without local control
Creators: name: Shvetsov, A.
name: Satanin, A. M.
name: Nori, Franco
name: Savel'ev, S.
name: Zagoskin, A. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A quantum metamaterial can be implemented as a quantum coherent 1D array of qubits placed in a transmission line. The properties of quantum metamaterials are determined by the local quantum state of the system. Here we show that a spatially-periodic quantum state of such a system can be realized without direct control of the constituent qubits, by their interaction with the initializing ("priming") pulses sent through the system in opposite directions. The properties of the resulting quantum photonic crystal are determined by the choice of the priming pulses. This proposal can be readily generalized to other implementations of quantum metamaterials.
description: 6 pages, 5 figures
Feeding Versus Feedback in AGNs from Near-Infrared IFU Observations: The Case of Mrk79
Creators: name: Riffel, Rogemar A.
name: Storchi-Bergmann, Thaisa
name: Winge, Claudia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have mapped the gaseous kinematics and the emission-line flux distributions and ratios from the inner ~680pc radius of the Seyfert 1 galaxy Mrk79, using two-dimensional (2D) near-IR J- and Kl-band spectra obtained with the Gemini instrument NIFS at a spatial resolution of ~100pc and velocity resolution of ~40km/s. The molecular hydrogen flux distribution presents two spiral arms extending by ~700pc, one to the north and another to the south of the nucleus, with an excitation indicating heating by X-rays from the central source. The low velocity dispersion (sigma~50km/s) and rotation pattern supports a location of the H2 gas in the disk of the galaxy. Blueshifts observed along the spiral arm in the far side of the galaxy and redshifts in the spiral arm in the near side, suggest that the spiral arms are feeding channels of H2 to the inner 200pc. From channel maps along the H2 l2.1218um emission-line profile we estimate a mass inflow rate of ~4E-3 M_Sun/year, which is one order of magnitude smaller than the mass accretion rate necessary to power the AGN of Mrk79. The emission from the ionized gas (traced by Pabeta and [FeII]l1.2570um emission lines) is correlated with the radio jet and with the narrow-band [OIII] flux distribution. Its kinematics shows both rotation and outflows to the north and south of the nucleus. The ionized gas mass outflow rate through a cross section with radius ~320pc located at a distance of ~455pc from the nucleus is 3.5 MSun/year, which is much larger than the AGN mass accretion rate, indicating that most of the outflowing gas originates in the interstellar medium surrounding the galaxy nucleus, which is pushed away by a nuclear jet.
description: Accepted by MNRAS
Pericenter passage of the gas cloud G2 in the Galactic Center
Creators: name: Gillessen, Stefan
name: Genzel, Reinhard
name: Fritz, Tobias K
name: Eisenhauer, Frank
name: Pfuhl, Oliver
name: Ott, Thomas
name: Schartmann, Marc
name: Ballone, Alessandro
name: Burkert, Andreas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have further followed the evolution of the orbital and physical properties of G2, the object currently falling toward the massive black hole in the Galactic Center on a near-radial orbit. New, very sensitive data were taken in April 2013 with NACO and SINFONI at the ESO VLT . The 'head' of G2 continues to be stretched ever further along the orbit in position-velocity space. A fraction of its emission appears to be already emerging on the blue-shifted side of the orbit, past pericenter approach. Ionized gas in the head is now stretched over more than 15,000 Schwarzschild radii RS around the pericenter of the orbit, at ~ 2000 RS ~ 20 light hours from the black hole. The pericenter passage of G2 will be a process stretching over a period of at least one year. The Brackett-γ luminosity of the head has been constant over the past 9 years, to within +- 25%, as have the line ratios Brackett-γ / Paschen-α and Brackett-γ / Helium-I. We do not see any significant evidence for deviations of G2's dynamical evolution, due to hydrodynamical interactions with the hot gas around the black hole, from a ballistic orbit of an initially compact cloud with moderate velocity dispersion. The constant luminosity and the increasingly stretched appearance of the head of G2 in the position-velocity plane, without a central peak, is not consistent with several proposed models with continuous gas release from an initially bound zone around a faint star on the same orbit as G2.
description: 10 figures, submitted to ApJ
48 esposizione internazionale d'arto. La Biennale di Venezia
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Sound in art
Sound installations (Art)
Art, Modern--Exhibitions

description: A video tour of the 48th Biennale di Venezia exhibition, including a sound installation by Neuhaus starting at 1:40
Phenomenological theory of the giant magnetoimpedance of composite wires
Creators: name: Betzholz, Ralf
name: Gao, Haibin
name: Zhao, Zhenjie
name: Hartmann, Uwe
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Composite wires with a three-layered structure are known to show a particularly large magnetoimpedance effect. The wires consist of a highly conductive core, an insulating layer and an outer ferromagnetic shell. In order to understand the origin of the effect a theory based on a coupling of the Maxwell equations to the Landau-Lifschitz-Gilbert equation is suggested. The theory is phenomenological in the sense that it does not account for a domain structure. However, theoretical results nicely reproduce those obtained in various measurements. Furthermore, an upper limit of the magnetoimpedance ratio for a given combination of materials can be determined.
description: 4 pages, figures
Effects of Data Enrichment with Image Transformations on the Performance of Deep Networks
Creators: name: Temiz, Hakan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Images cannot always be expected to come in a certain standard format and orientation. Deep networks need to be trained to take into account unexpected variations in orientation or format. For this purpose, training data should be enriched to include different conditions. In this study, the effects of data enrichment on the performance of deep networks in the super resolution problem were investigated experimentally. A total of six basic image transformations were used for the enrichment procedures. In the experiments, two deep network models were trained with variants of the ILSVRC2012 dataset enriched by these six image transformation processes. Considering a single image transformation, it has been observed that the data enriched with 180 degree rotation provides the best results. The most unsuccessful result was obtained when the models were trained on the enriched data generated by the flip upside down process. Models scored highest when trained with a mix of all transformations.
Automatic and Accurate Classification of Hotel Bathrooms from Images with Deep Learning
Creators: name: Temiz, Hakan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Hotel bathrooms are one of the most important places in terms of customer satisfaction, and where the most complaints are reported. To share their experiences, guests rate hotels, comment, and share images of their positive or negative ratings. An important part of the room images shared by guests is related to bathrooms. Guests tend to prove their satisfaction or dissatisfaction with the bathrooms with images in their comments. These Positive or negative comments and visuals potentially affect the prospective guests. In this study, two different versions of a deep learning algorithm were designed to classify hotel bathrooms as satisfactory (good) or unsatisfactory (bad, when any defects such as dirtiness, deficiencies, malfunctions were present) by analyzing images. The best-performer between the two models was determined as a result of a series of extensive experimental studies. The models were trained for each of 144 combinations of 5 hyper-parameter sets with a data set containing more than 11 thousand bathroom images, specially created for this study. The "HotelBath" data set was shared also with the community with this study. Four different image sizes were taken into consideration: 128, 256, 512 and 1024 pixels in both directions. The classification performances of the models were measured with several metrics. Both algorithms showed very attractive performances even with many combinations of hyper-parameters. They can classify bathroom images with very high accuracy. Suh that the top algorithm achieved an accuracy of 92.4% and an AUC (area under the curve) score of 0.967. In addition, other metrics also proved the success...
An Inverse Approach to Windows' Resource-Based Permission Mechanism for Access Permission Vulnerability Detection
Creators: name: Temiz, Hakan
name: Buyukeke, Ahmet
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In organizations, employees work with information stored in files according to their duties and responsibilities. Windows uses resource-based access permissions that any permission for any user has to be set separately per resource. This approach gets complicated as the number of resources and users increase, and causes oversights in assigning permissions. Therefore, a special mechanism is required to scrutinize what permissions any employee has on any set of resources. This requirement is circumvented by reversing the Windows approach in terms of user-accessible resources. This approach is implemented by a program allowing quick and easy examination of any type of permissions granted or denied to active directory users on any folder. In this way, administrators can make sure there is no any missing or overlooked setting that could cause a security vulnerability. This approach can easily be extended to scrutinize other resources, and for other local or active directory objects.
News Release
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Emergency vehicles
Sirens (signaling devices)
Emergency vehicles--Safety measures
Sound--Experiments

description: Starts with about 3 minutes of news clips related to Neuhaus, followed by recording of documentary Super Chief about Earl Warren. The news clips cover Neuhaus’s efforts to create a new siren sound for emergency vehicles designed to reduce noise pollution and prevent vehicle collisions
Length statistics of random multicurves on closed hyperbolic surfaces
Creators: name: Liu, Mingkun
Publisher: name: arXiv
Year: 2019
Subjects: subject: Geometric Topology (math.GT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In this paper, we determine the distribution of the length partition of a random multicurve of fixed topological type on a closed hyperbolic surface using the methods of Margulis' thesis and Mirzakhani's equidistribution theorem for horospheres. This distribution admits a polynomial density, whose coefficients can be expressed explicitly in terms of intersection numbers of psi-classes on the Deligne--Mumford compactification, and in particular it does not depend on the hyperbolic metric. This result generalizes prior work of M. Mirzakhani in the case of random pants decompositions. Results very close to ours are obtained independently and simultaneously by F. Arana-Herrera.
Interplay between magnetism and magnetocaloric effect in NdCuSi
Creators: name: Gupta, Sachin
name: Suresh1, K. G.
name: Nigam, A. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the magnetic, thermal, magnetocaloric and transport properties of polycrystalline NdCuSi. The compound shows a weak antiferromagnetic ordering, as confirmed by different measurements. Arrott plots indicate that the magnetic phase transition is found to be second order in nature. The isothermal magnetic entropy change calculated using the magnetization data gives a value of 11.1 J/kg K for a field change of 50 kOe. The follows h2/3 dependence (h is the reduced field) with a negative intercept, which is predicted by mean field theory for second order phase transitions. Landau theory of phase transition was applied to calculate change in entropy, which was found to be in good agreement with that calculated directly from the magnetization data. Temperature dependence of electrical resistivity shows a pronounced anomaly at the ordering temperature, which is attributed to the spin fluctuations.
description: 13 pages, 7 figures
Search for Higgs boson production in oppositely charged dilepton and missing energy final states in 9.7 fb-1 of ppbar collisions at sqrts = 1.96 TeV
Creators: name: D0 Collaboration
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for Higgs boson in final states with two oppositely charged leptons and large missing transverse energy as expected in H -> WW -> lvlv decays. The events are selected from the full Run II data sample of 9.7 fb-1 of ppbar collisions collected with the D0 detector at the Fermilab Tevatron Collider at sqrt s = 1.96 TeV. To validate our search methodology, we measure the non-resonant W W production cross section and find sigma_WW = 11.6 +/- 0.7 pb, in agreement with the standard model prediction. In the Higgs boson search, no significant excess above the background expectation is observed. Upper limits at the 95% confidence level on the Higgs boson production cross section are therefore derived. Within the standard model, the Higgs boson mass range 159 < MH < 176 GeV is excluded while the expected exclusion sensitivity is 156 < MH < 172 GeV. For a mass hypothesis of MH = 125 GeV, we exclude Higgs boson production cross sections 4.1 times larger than the standard model expectation, which is compatible with the presence of a Higgs boson at this mass. Within a theoretical framework with a fourth generation of fermions, the mass range 125 < MH < 218 GeV is excluded. The search results are also interpreted in the context of fermiophobic Higgs boson couplings, which yields an exclusion of fermiophobic Higgs boson production cross sections 3.1 times larger than the expectation for MH = 125 GeV.
description: 24 pages, 64 figures
Integrated tool-set for Control, Calibration and Characterization of quantum devices applied to superconducting qubits
Creators: name: Wittler, Nicolas
name: Roy, Federico
name: Pack, Kevin
name: Werninghaus, Max
name: Roy, Anurag Saha
name: Egger, Daniel J.
name: Filipp, Stefan
name: Wilhelm, Frank K.
name: Machnes, Shai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Efforts to scale-up quantum computation have reached a point where the principal limiting factor is not the number of qubits, but the entangling gate infidelity. However, the highly detailed system characterization required to understand the underlying error sources is an arduous process and impractical with increasing chip size. Open-loop optimal control techniques allow for the improvement of gates but are limited by the models they are based on. To rectify the situation, we provide an integrated open-source tool-set for Control, Calibration and Characterization, capable of open-loop pulse optimization, model-free calibration, model fitting and refinement. We present a methodology to combine these tools to find a quantitatively accurate system model, high-fidelity gates and an approximate error budget, all based on a high-performance, feature-rich simulator. We illustrate our methods using simulated fixed-frequency superconducting qubits for which we learn model parameters with less than 1% error and derive a coherence limited cross-resonance (CR) gate that achieves 99.6% fidelity without need for calibration.
description: Source code available at http://q-optimize.org; added references; updated with journal version; updated references
Do floating orbits in extreme mass ratio binary black holes exist?
Creators: name: Kapadia, Shasvath J.
name: Kennefick, Daniel
name: Glampedakis, Kostas
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper examines the possibility of floating or non-decaying orbits for extreme mass ratio binary black holes. In the adiabatic approximation, valid in the extreme mass ratio case, if the orbital flux lost due to gravitational radiation reaction is compensated for by the orbital flux gained from the spins of the black holes via superradiant scattering (or, equivalently, tidal acceleration) the orbital decay would be stalled, causing the binary to "float". We show that this flux balance is not, in practice, possible for extreme mass ratio binary black holes with circular equatorial orbits; furthermore, adding eccentricity and inclination to the orbits will not significantly change this null result, thus ruling out the possibility of floating orbits for extreme mass ratio binary black holes. We also argue that binaries consisting of material bodies dense and massive enough to generate gravitational waves detectable by any kind of gravitational wave detector are also unlikely to float. Using a multipolar analysis, we show that a non-Kerr spacetime which could produce a floating orbit (given the same amount of tidal acceleration as in the case of a Kerr black hole) would need to be rapidly rotating prolate spheroid, which would be an exotic object indeed.
description: 11 pages, 7 Figures