cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On purely transmitting defects in affine Toda field theory
Creators: name: Corrigan, E.
name: Zambon, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Affine Toda field theories with a purely transmitting integrable defect are considered and the model based on a_2 is analysed in detail. After providing a complete characterization of the problem in a classical framework, a suitable quantum transmission matrix, able to describe the interaction between an integrable defect and solitons, is found. Two independent paths are taken to reach the result. One is an investigation of the triangle equations using the S-matrix for the imaginary coupling bulk affine Toda field theories proposed by Hollowood, and the other uses a functional integral approach together with a bootstrap procedure. Evidence to support the results is collected in various ways: for instance, through the calculation of the transmission factors for the lightest breathers. While previous discoveries within the sine-Gordon model motivated this study, there are several new phenomena displayed in the a_2 model including intriguing disparities between the classical and the quantum pictures. For example, in the quantum framework, for a specific range of the coupling constant that excludes a neighbourhood of the classical limit, there is an unstable bound state.
description: 36 pages
Conformal Blocks from Celestial Gluon Amplitudes II: Single-valued Correlators
Creators: name: Fan, Wei
name: Fotopoulos, Angelos
name: Stieberger, Stephan
name: Taylor, Tomasz R.
name: Zhu, Bin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent paper, here referred to as part I, we considered the celestial four-gluon amplitude with one gluon represented by the shadow transform of the corresponding primary field operator. This correlator is ill-defined because it contains branch points related to the presence of conformal blocks with complex spin. In this work, we adopt a procedure similar to minimal models and construct a single-valued completion of the shadow correlator, in the limit when the shadow is "soft." By following the approach of Dotsenko and Fateev, we obtain an integral representation of such a single-valued correlator. This allows inverting the shadow transform and constructing a single-valued celestial four-gluon amplitude. This amplitude is drastically different from the original Mellin amplitude. It is defined over the entire complex plane and has correct crossing symmetry, OPE and bootstrap properties. It agrees with all known OPEs of celestial gluon operators. The conformal block spectrum consists of primary fields with dimensions $Δ=m+i λ$, with integer $m\geq 1$ and various, but always integer spin, in all group representations contained in the product of two adjoint representations.
description: 35 pages
Global Information Guided Video Anomaly Detection
Creators: name: Lv, Hui
name: Xu, Chunyan
name: Cui, Zhen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Video anomaly detection (VAD) is currently a challenging task due to the complexity of anomaly as well as the lack of labor-intensive temporal annotations. In this paper, we propose an end-to-end Global Information Guided (GIG) anomaly detection framework for anomaly detection using the video-level annotations (i.e., weak labels). We propose to first mine the global pattern cues by leveraging the weak labels in a GIG module. Then we build a spatial reasoning module to measure the relevance between vectors in spatial domain with the global cue vectors, and select the most related feature vectors for temporal anomaly detection. The experimental results on the CityScene challenge demonstrate the effectiveness of our model.
A steady-state magneto-optical trap of fermionic strontium on a narrow-line transition
Creators: name: Escudero, Rodrigo González
name: Chen, Chun-Chia
name: Bennetts, Shayne
name: Pasquiou, Benjamin
name: Schreck, Florian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A steady-state magneto-optical trap (MOT) of fermionic strontium atoms operating on the 7.5 kHz-wide ${^1\mathrm{S}_0} - {^3\mathrm{P}_1}$ transition is demonstrated. This MOT features $8.4 \times 10^{7}$ atoms, a loading rate of $1.3\times 10^{7}$atoms/s, and an average temperature of 12 $μ$K. These parameters make it well suited to serve as a source of atoms for continuous-wave superradiant lasers operating on strontium's mHz-wide clock transition. Such lasers have only been demonstrated using pulsed Sr sources, limiting their range of applications. Our MOT makes an important step toward continuous operation of these devices, paving the way for continuous-wave active optical clocks.
description: 11 pages, 7 figures
Quantum multiparty key distribution protocol without use of entanglement
Creators: name: Matsumoto, Ryutaroh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a quantum key distribution (QKD) protocol that enables three parties agree at once on a shared common random bit string in presence of an eavesdropper without use of entanglement. We prove its unconditional security and analyze the key rate.
description: 8 pages, no figure
Dewarping Document Image By Displacement Flow Estimation with Fully Convolutional Network
Creators: name: Xie, Guo-Wang
name: Yin, Fei
name: Zhang, Xu-Yao
name: Liu, Cheng-Lin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: As camera-based documents are increasingly used, the rectification of distorted document images becomes a need to improve the recognition performance. In this paper, we propose a novel framework for both rectifying distorted document image and removing background finely, by estimating pixel-wise displacements using a fully convolutional network (FCN). The document image is rectified by transformation according to the displacements of pixels. The FCN is trained by regressing displacements of synthesized distorted documents, and to control the smoothness of displacements, we propose a Local Smooth Constraint (LSC) in regularization. Our approach is easy to implement and consumes moderate computing resource. Experiments proved that our approach can dewarp document images effectively under various geometric distortions, and has achieved the state-of-the-art performance in terms of local details and overall effect.
Dirichlet series for finite combinatorial rank dynamics
Creators: name: Everest, G.
name: Miles, R.
name: Stevens, S.
name: Ward, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 37C30, 26E30, 12J25

description: We introduce a class of group endomorphisms -- those of finite combinatorial rank -- exhibiting slow orbit growth. An associated Dirichlet series is used to obtain an exact orbit counting formula, and in the connected case this series is shown to have a closed rational form. Analytic properties of the Dirichlet series are related to orbit-growth asymptotics: depending on the location of the abscissa of convergence and the degree of the pole there, various orbit-growth asymptotics are found, all of which are polynomially bounded.
description: reference for Agmon's theorem added
Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
Creators: name: Woodward, R. I.
name: Lo, Y. S.
name: Pittaluga, M.
name: Minder, M.
name: Paraïso, T. K.
name: Lucamarini, M.
name: Yuan, Z. L.
name: Shields, A. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication that eliminates all detector side-channels, although is currently limited by implementation complexity and low secure key rates. Here, we introduce a simple and compact MDI-QKD system design at gigahertz clock rates with enhanced resilience to laser fluctuations - thus enabling free-running semiconductor laser sources to be employed without spectral or phase feedback. This is achieved using direct laser modulation, carefully exploiting gain-switching and injection-locking laser dynamics to encode phase-modulated time-bin bits. Our design enables secure key rates that improve upon the state of the art by an order of magnitude, up to 8 bps at 54 dB channel loss and 2 kbps in the finite-size regime for 30 dB channel loss. This greatly simplified MDI-QKD system design and proof-of-principle demonstration shows that MDI-QKD is a practical, high-performance solution for future quantum communication networks.
Large deviations for quantum Markov semigroups on the 2 x 2 matrix algebra
Creators: name: Comman, Henri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 46L55; 82C10; 60F10

description: Let $({\mathcal{T}}_{*t})$ be a predual quantum Markov semigroup acting on the full 2 x 2 matrix algebra and having an absorbing pure state. We prove that for any initial state $ω$, the net of orthogonal measures representing the net of states $({\mathcal{T}}_{*t}(ω))$ satisfies a large deviation principle in the pure state space, with a rate function given in terms of the generator, and which does not depend on $ω$. This implies that $({\mathcal{T}}_{*t}(ω))$ is faithful for all $t$ large enough. Examples arising in weak coupling limit are studied.
description: We correct a mistake in the statement of Lemma 1 in the preliminaries section (this has no effect on the proofs and results of the paper); typos corrected
A production and cost analysis of log transportation by flatbed trucks in the central jungle region of Peru
Creators: name: Aquino, David Cirilo
Publisher: name: University of British Columbia
Year: 2010

description: This thesis reports a study of the productivity and cost of hauling logs by flatbed trucks, observed during 1985 at Belho Horizonte S.C.R. Ltd. sawmill, in Pichanaki, Peru. This operation typifies many similar hauling operations in the Peruvian tropical mountain forests. In order to investigate means of improving productivity and decreasing hauling costs in the hauling operations of the Forest companies in the Central Jungle Region of Peru, the productivity and cost trade-offs of truck hauling by diesel-powered trucks and gasoline-powered trucks was evaluated. Furthermore, the overall hauling system was also examined to identify the main factors that govern productivity and costs of the flatbed trucks. The truck activities during the entire hauling cycle were recorded using Servis Recorders. The haul distance, the number of logs and the volume hauled per trip were also recorded on a survey form. Complementary information regarding truck cost parameters was also obtained. The results show that there is no significant difference in performance between gasoline-powered trucks and diesel-powered trucks when they are compared for the following operating variables: velocity empty, velocity loaded, delay, loading and unloading time. Significantly greater payloads per trip have been found for diesel-powered trucks. Very low productivity and very expensive hauling costs have been found for both types of truck as a result of low truck speed caused by the poor conditions of the forest roads, low productivity of the manual loading method, and excessive delay time per trip. Substantial productivity increases and haul cost reductions can be obtained by upgrading the forest roads, mechanizing the loading operation, reducing the delay time, and loading the vehicles to their capacity every trip. Under the existing operating conditions, hauling logs with used (17-18 yr-old) gasoline-powered trucks was more cost efficient for the most frequent one-way haul distance (30-50 km) in the Central Jungle Region of Peru. The information provided in this study can be applied for planning purposes and to examine the feasibility of using trucks of greater payload capacity, and new loading and unloading equipment. In addition, the actual configuration of the forest roads can be compared to the requirements of future trucking equipment.
Percolation of Vortices in the 3D Abelian Lattice Higgs Model
Creators: name: Wenzel, Sandro
name: Bittner, Elmar
name: Janke, Wolfhard
name: Schakel, Adriaan M. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The compact Abelian Higgs model is simulated on a cubic lattice where it possesses vortex lines and pointlike magnetic monopoles as topological defects. The focus of this high-precision Monte Carlo study is on the vortex network, which is investigated by means of percolation observables. In the region of the phase diagram where the Higgs and confinement phases are separated by a first-order transition, it is shown that the vortices percolate right at the phase boundary, and that the first-order nature of the transition is reflected by the network. In the crossover region, where the phase boundary ceases to be first order, the vortices are shown to still percolate. In contrast to other observables, the percolation observables show finite-size scaling. The exponents characterizing the critical behavior of the vortices in this region are shown to fall in the random percolation universality class.
description: 24 pages, 12 figures
Enhancing the Detection of Natural Thermal Entanglement with Disorder
Creators: name: Hide, Jenny
name: Son, Wonmin
name: Vedral, Vlatko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Physical systems have some degree of disorder present in them. We discuss how to treat natural, thermal entanglement in any random macroscopic system from which a thermodynamic witness bounded by a constant can be found. We propose that functional many-body perturbation theory be applied to allow either a quenched or an annealed average over the disorder to be taken. We find when considering the example of an XX Heisenberg spin chain with a random coupling strength, that the region of natural entanglement detected by both witnesses can be enhanced by the disorder.
description: 4 pages, 2 figures, accepted by Physical Review Letters
Post-merger evolution of double helium white dwarfs and distribution of helium-rich hot subdwarfs
Creators: name: Yu, Jinlong
name: Zhang, Xianfei
name: Lv, Guoliang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The mergers of double helium white dwarfs are believed to form isolated helium-rich hot subdwarfs. Observation shows that the helium-rich hot subdwarfs can be divided into two subgroups based on whether the surface is carbon-rich or carbon-normal. But it is not clear whether this distribution directly comes from binary evolution. We adopt the binary population synthesis (BPS) to obtain the population of single helium-rich hot subdwarfs according to the channel of double helium white dwarfs merger. We find that the merger channel can represent the two subgroups in the $T_{\rm{eff}}-\log g$ plane related to different masses of progenitor helium white dwarfs. For $Z$ = 0.02, the birth rates and local density of helium-rich hot subdwarf stars by the mergers of two helium white dwarfs is $\sim 4.82 \times 10^{-3}$ $\rm yr^{-1}$ and $\sim$ 290.0 $\rm kpc^{-3}$ at 13.7 Gyr in our Galaxy, respectively. The proportion of carbon-rich and carbon-normal helium-rich hot subdwarfs are 32$\%$ and 68$\%$, respectively.
description: 6 pages, 4 figures, accepted by MNRAS, comments welcome!
Particle beam eigen-emittances, phase integral, vorticity, and rotations
Creators: name: Groening, L.
name: Xiao, C.
name: Chung, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Particle beam eigen-emittances comprise the lowest set of rms-emittances that can be imposed to a beam through symplectic optical elements. For cases of practical relevance this paper introduces an approximation providing a very simple and powerful relation between transverse eigen-emittance variation and the beam phase integral. This relation enormously facilitates modeling eigen-emittance tailoring scenarios. It reveals that difference of eigen-emittances is given by the beam phase integral or vorticity rather than by angular momentum. Within the approximation any beam is equivalent to two objects rotating at angular velocities of same strength and different sign. A description through circular beam modes has been done already in [A. Burov, S. Nagaitsev, and Y. Derbenev, Circular modes, beam adapters, and their applications in beam optics, Phys. Rev. E 66, 016503 (2002)]. The new relation presented here is a complementary and vivid approach to provide a physical picture of the nature of eigen-emittances for cases of practical interest.
description: 12 pages, 5 figures
Zone S: Auxiliary summary: Source > Function
Creators: name: Crane, Thera Marie
Publisher: name: Zenodo
Year: 2025

description: This document, a companion to Carbo et al. (2025), samples lexical source meanings and their corresponding auxiliary functions from the Zone S auxiliary database, including both more lexical functions and more grammatical functions, to give an overview of grammaticalization patterns. Meanings and functions are derived based on grammatical descriptions (see Carbo et al. 2025 for source information). Some assumptions have been made in our attempt to unify “core” source meanings and auxiliary functions, for comparative purposes, but we have been relatively conservative in describing functions. Therefore, some items with separate functional entries may, in fact, be used similarly or identically across languages.

This document is not exhaustive, and, in particular, the absence of an attested auxiliary or function in a particular language (especially if other languages in the same cluster exhibit these auxiliaries) does not mean for certain that it does not occur in that language, or with that function.

 

For additional information, including references: Carbo, Matilda, Thera Marie Crane & Hilde Gunnink. 2025. ‘Comparative auxiliary spreadsheet for Southern Bantu languages.’ DOI: 10.5281/zenodo.15143755
Autonomous stabilization of photonic Laughlin states through angular momentum potentials
Creators: name: Umucalilar, Rifat Onur
name: Simon, Jonathan
name: Carusotto, Iacopo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We propose a method to stabilize Laughlin states of a large number of strongly interacting photons by combining a frequency-selective incoherent pump with a step-like potential in the angular momentum basis. Analytical expressions for the preparation efficiency and for the principal error sources are obtained. Direct extension of the preparation scheme to states containing single or multiple quasiholes is discussed.
description: 5+3 pages
Symmetry-breaking boundary states for WZW models
Creators: name: Blakeley, Daniel
name: Recknagel, Andreas
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Starting with the SU(2)_k WZW model, we construct boundary states that generically preserve only a parafermion times Virasoro subalgebra of the full affine Lie algebra symmetry of the bulk model. The boundary states come in families: intervals for generic k, quotients of SU(2) by discrete groups if k is a square. In that case, special members of the families can be viewed as superpositions of rotated Cardy branes. Using embeddings of SU(2) into higher groups, the new boundary states can be lifted to symmetry-breaking branes for other WZW models.
description: 22 pages; notes and references added
The use of fluorescent dye and site characteristics to evaluate surface erosion on harvested areas in the Vernon Forest District, B.C.
Creators: name: Traynor, Janice Mae
Publisher: name: University of British Columbia
Year: 2010

description: Surface erosion on forest lands can cause stream sedimentation and reduce site productivity. In the North Okanagan downstream irrigation and municipal demand require low sediment levels in their water. Higher elevation forest lands have shallow soils developed from nutrient-poor glacial till. To evaluate erosion occurrence on forest lands a research project was initiated in the summer of 1984 on 10 sites in mid-elevation, recently harvested cutblocks in the Vernon Forest Region. The objective of the study was to evaluate surface erosion and relate erosion intensity to site characteristics. Two separate methods were used to accomplish this. Line transects sampled soil disturbance and examined causal factors for erosion occurrence. Fluorescent dye plots, established on four of the 10 sites, examined rate, distance and patterns of downslope soil particle movement. Transects were surveyed in a grid pattern across the cutblock and results indicated areal distribution of disturbance. Soil disturbance at the sample point was recorded using 10 classes ranging from bare soil and litter disturbance to deep gouges and deep deposits of soil. Assessment of care-in-logging and identification of existing and potential erosion sites completed the site evaluation. Day-Glo fluorescent pigment was used to tag soil in situ. Dye was applied in August, 1984, in one metre strips across the slope on plots varying in aspect, slope and disturbance. Field measurement of soil movement was completed in the spring of 1985, shortly after snowmelt. Tagged particles were located and illuminated at night by ultraviolet light. A hand held mineral lamp provided sufficient illumination and fluorescence was recorded on color film. Soil-movement ratings, based on visual perception of particle movement, were assigned to each plot. These ratings were compared to plot and site characteristics to identify possible erosion trends. The results of this study support the consensus of research results reported in the literature. The major sites of erosion are skid trails and the road system. Steep slopes, fine' soil, north aspects and compaction increase potential erosion. Fluorescent dye is an effective soil particle tag allowing distance and pathways of movement to be identified. Day-Glo fluorescent pigment in a solution of acetone was fully satisfactory in adherence to the particle and in persistence under prevailing climatic conditions.
A Catalog of Diffuse Interstellar Bands in the Spectrum of HD 204827
Creators: name: Hobbs, L. M.
name: York, D. G.
name: Snow, T. P.
name: Oka, T.
name: Thorburn, J. A.
name: Bishof, M.
name: Friedman, S. D.
name: McCall, B. J.
name: Rachford, B.
name: Sonnentrucker, P.
name: Welty, D. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Echelle spectra of the double-lined spectroscopic binary HD 204827 were obtained on five nights, at a resolving power R = 38,000 and with a S/N ratio = 750 near 6000 A in the final, combined spectrum. The stars show E(B-V) = 1.11 and spectral types near O9.5V and B0.5III. A catalog is presented of 380 diffuse interstellar bands (DIBs) measured between 3900 and 8100 A in the stars' spectrum. The central wavelengths, the widths (FWHM), and the equivalent widths of nearly all of the bands are tabulated, along with the minimum uncertainties in the latter. The reliable removal of very weak stellar lines from the catalog, and of some stellar lines from the less severe blends with DIBs, is made generally easy by the highly variable radial velocities of both stars. The principal result of this investigation is that the great majority of the bands in the catalog are very weak and relatively narrow. Typical equivalent widths amount to a few mA, and the band widths (FWHM) are most often near 0.55 A. Therefore, most of these DIBs can be detected only in spectra obtained at a resolving power and a S/N ratio at least comparable to those used here. In addition, the anomalous interstellar reddening and the very high value of the ratio N(C2)/E(B-V) seen toward HD 204827 indicate that the physical conditions in one or more of the several interstellar clouds seen in this direction differ significantly from those found toward the prototypical DIB target HD 183143, for example. Probably primarily for these reasons, 113 of the 380 bands, or 30%, were not detected in four previous, modern surveys of the DIBs seen in the spectra of stars other than HD 204827. Both the tabulated data for the DIBs and a plot of our spectrum of HD 204827 are available online at http://dibdata.org
description: 85 pages (17 of text, 14 of tables, 54 of figures). To appear in the Astrophysical Journal
17q12-q21 variants interact with early-life exposures to modify asthma risk in Black children - Supplement
Creators: name: Gereige, Jessica
name: Morin, Andreanne
name: Calatroni, Agustin
name: Visness, Cynthia
name: Wood, Robert
name: Kattan, Meyer
name: Bacharier, Leonard
name: Becker, Patrice
name: Altman, Matthew
name: Gern, James
name: Ober, Carole
name: O'Connor, George
Publisher: name: Zenodo
Year: 2021

description: Supplementary Material (Methods, Tables E1-3, Figures E1-4)
The Higgs boson -- its implications and prospects for future discoveries
Creators: name: Bass, Steven D.
name: De Roeck, Albert
name: Kado, Marumi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Higgs boson, a fundamental scalar, was discovered at CERN in 2012 with mass 125 GeV, a mass that turned out to be a remarkable choice of Nature. In the Standard Model of particle physics, the Higgs boson is closely linked to the mechanism that gives mass to the W and Z gauge bosons that mediate the weak interactions and to the charged fermions. Following discovery of the Higgs boson, present measurements at the Large Hadron Collider are focused on testing the Higgs boson's couplings to other elementary particles, precision measurements of the Higgs boson's properties and initial investigation of the Higgs boson's self-interaction and shape of the Higgs potential. With the Higgs boson mass of 125 GeV the vacuum sits very close to the border of stable and metastable, which may be a hint to deeper physics beyond the Standard Model. The Higgs potential also plays an important role in ideas about the cosmological constant or dark energy that drives the accelerating expansion of the Universe, the mysterious dark matter that comprises about 80% of the matter component in the Universe, as well as a possible phase transition in the early Universe that might be responsible for baryogenesis. Detailed study of the Higgs boson is at the centre of the recent European Strategy for Particle Physics update. Here we review the present status of this physics and discuss the new insights expected from present and future experiments.
description: Preprint of article submitted to Nature Reviews Physics, 25 pages, 8 figures
Learning Group Activities from Skeletons without Individual Action Labels
Creators: name: Zappardino, Fabio
name: Uricchio, Tiberio
name: Seidenari, Lorenzo
name: Del Bimbo, Alberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: To understand human behavior we must not just recognize individual actions but model possibly complex group activity and interactions. Hierarchical models obtain the best results in group activity recognition but require fine grained individual action annotations at the actor level. In this paper we show that using only skeletal data we can train a state-of-the art end-to-end system using only group activity labels at the sequence level. Our experiments show that models trained without individual action supervision perform poorly. On the other hand we show that pseudo-labels can be computed from any pre-trained feature extractor with comparable final performance. Finally our carefully designed lean pose only architecture shows highly competitive results versus more complex multimodal approaches even in the self-supervised variant.
description: ICPR 2020
Incommensurate smectic phase in close proximity to the high-Tc superconductor FeSe/SrTiO3
Creators: name: Yuan, Yonghao
name: Fan, Xuemin
name: Wang, Xintong
name: He, Ke
name: Zhang, Yan
name: Xue, Qi-Kun
name: Li, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Superconductivity is significantly enhanced in monolayer FeSe grown on SrTiO3, but not for multilayer films, in which large strength of nematicity develops. However, the link between the high-transition temperature superconductivity in monolayer and the correlation related nematicity in multilayer FeSe films is not well understood. Here, we use low-temperature scanning tunneling microscopy to study few-layer FeSe thin films grown by molecular beam epitaxy. We observe an incommensurate long-range smectic phase, which solely appears in bilayer FeSe films. The smectic order still locally exists and gradually fades away with increasing film thickness, while it suddenly vanishes in monolayer FeSe, indicative of an abrupt smectic phase transition. Surface alkali-metal doping can suppress the smectic phase and induce high-Tc superconductivity in bilayer FeSe. Our observations provide evidence that the monolayer FeSe is in close proximity to the smectic phase, and its superconductivity is likely enhanced by this electronic instability as well.
description: Comments are welcome: )
Improving HTc Josephson Junctions (HTc JJ) by annealing: the role of vacancy-interstitial annihilation
Creators: name: Sirena, M.
name: Matzen, S.
name: Bergeal, N.
name: Lesueur, J.
name: Faini, G.
name: Bernard, R.
name: Briatico, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have studied the annealing effect in transport properties of High temperature Josephson Junctions (HTc JJ) made by ion irradiation. Low temperature annealing (80 degrees Celsius) increases the JJ transition temperature (TJ) and the Ic.Rn product, where Ic is the critical current and Rn the normal resistance. We found that the spread in JJ characteristics can be lowered by sufficient long annealing times. Using random walk numerical simulations, we showed that the characteristic annealing time and the evolution of the spread in JJ characteristics can be explained by a vacancy-interstitial annihilation process rather than by an oxygen diffusion one.
description: 7 pages and 3 figures submitted to Applied Physics Letters
Absence of diffusion in certain random lattices: Numerical evidence
Creators: name: Markos, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate, by solving numerically the time-dependent Schroedinger equation, the physical character of electron localization in a disordered two-dimensional lattice. We show, in agreement with the prediction of P. W. Anderson, that the disorder prevents electron diffusion. The electron becomes spatially localized in a specific area of the system. Our numerical analysis confirms that the electron localization is a quantum effect caused by the wave character of electron propagation and has no analogy in classical mechanics.
description: *.png figures
Low-temperature and high-temperature approximations for penetrable-sphere fluids. Comparison with Monte Carlo simulations and integral equation theories
Creators: name: Malijevsky, Alexandr
name: Yuste, Santos B.
name: Santos, Andres
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The two-body interaction in dilute solutions of polymer chains in good solvents can be modeled by means of effective bounded potentials, the simplest of which being that of penetrable spheres (PSs). In this paper we construct two simple analytical theories for the structural properties of PS fluids: a low-temperature (LT) approximation, that can be seen as an extension to PSs of the well-known solution of the Percus-Yevick (PY) equation for hard spheres, and a high-temperature (HT) approximation based on the exact asymptotic behavior in the limit of infinite temperature. Monte Carlo simulations for a wide range of temperatures and densities are performed to assess the validity of both theories. It is found that, despite their simplicity, the HT and LT approximations exhibit a fair agreement with the simulation data within their respective domains of applicability, so that they complement each other. A comparison with numerical solutions of the PY and the hypernetted-chain approximations is also carried out, the latter showing a very good performance, except inside the core at low temperatures.
description: 14 pages, 8 figures; v2: some figures redone; small changes
A Logic Programming Framework for Combinational Circuit Synthesis
Creators: name: Tarau, Paul
name: Luderman, Brenda
Publisher: name: arXiv
Year: 2008
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Discrete Mathematics (cs.DM)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Logic Programming languages and combinational circuit synthesis tools share a common "combinatorial search over logic formulae" background. This paper attempts to reconnect the two fields with a fresh look at Prolog encodings for the combinatorial objects involved in circuit synthesis. While benefiting from Prolog's fast unification algorithm and built-in backtracking mechanism, efficiency of our search algorithm is ensured by using parallel bitstring operations together with logic variable equality propagation, as a mapping mechanism from primary inputs to the leaves of candidate Leaf-DAGs implementing a combinational circuit specification. After an exhaustive expressiveness comparison of various minimal libraries, a surprising first-runner, Strict Boolean Inequality "
Permutation Decoding and the Stopping Redundancy Hierarchy of Cyclic and Extended Cyclic Codes
Creators: name: Hehn, Thorsten
name: Milenkovic, Olgica
name: Laendner, Stefan
name: Huber, Johannes B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We introduce the notion of the stopping redundancy hierarchy of a linear block code as a measure of the trade-off between performance and complexity of iterative decoding for the binary erasure channel. We derive lower and upper bounds for the stopping redundancy hierarchy via Lovasz's Local Lemma and Bonferroni-type inequalities, and specialize them for codes with cyclic parity-check matrices. Based on the observed properties of parity-check matrices with good stopping redundancy characteristics, we develop a novel decoding technique, termed automorphism group decoding, that combines iterative message passing and permutation decoding. We also present bounds on the smallest number of permutations of an automorphism group decoder needed to correct any set of erasures up to a prescribed size. Simulation results demonstrate that for a large number of algebraic codes, the performance of the new decoding method is close to that of maximum likelihood decoding.
description: 40 pages, 6 figures, 10 tables, submitted to IEEE Transactions on Information Theory
Quantifying the Impact of Boundary Constraint Handling Methods on Differential Evolution
Creators: name: Boks, Rick
name: Kononova, Anna V.
name: Wang, Hao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences
subject: I.2.8

description: Constraint handling is one of the most influential aspects of applying metaheuristics to real-world applications, which can hamper the search progress if treated improperly. In this work, we focus on a particular case - the box constraints, for which many boundary constraint handling methods (BCHMs) have been proposed. We call for the necessity of studying the impact of BCHMs on metaheuristics' performance and behavior, which receives seemingly little attention in the field. We target quantifying such impacts through systematic benchmarking by investigating 28 major variants of Differential Evolution (DE) taken from the modular DE framework (by combining different mutation and crossover operators) and $13$ commonly applied BCHMs, resulting in $28 \times 13 = 364$ algorithm instances after pairing DE variants with BCHMs. After executing the algorithm instances on the well-known BBOB/COCO problem set, we analyze the best-reached objective function value (performance-wise) and the percentage of repaired solutions (behavioral) using statistical ranking methods for each combination of mutation, crossover, and BBOB function group. Our results clearly show that the choice of BCHMs substantially affects the empirical performance as well as the number of generated infeasible solutions, which allows us to provide general guidelines for selecting an appropriate BCHM for a given scenario.
description: 9 pages, 2 figures. To be published in the 2021 Genetic and Evolutionary Computation Conference Companion
Discovery of mesoscopic nematicity wave in iron-based superconductors
Creators: name: Shimojima, T.
name: Motoyui, Y.
name: Taniuchi, T.
name: Bareille, C.
name: Onari, S.
name: Kontani, H.
name: Nakajima, M.
name: Kasahara, S.
name: Shibauchi, T.
name: Matsuda, Y.
name: Shin, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Nematicity is ubiquitous in electronic phases of high transition temperature superconductors, particularly in iron-based superconductors (IBSCs). Order parameter that characterizes the nematic phase has been investigated in momentum space, but its real-space arrangement remains largely unclear. We use linear dichroism (LD) in low-temperature laser-photoemission electron microscope to map out the nematic order parameter of nonmagentic FeSe and antiferromagnetic BaFe2(As0.87P0.13)2. In contrast to the structural domains that have atomic-scale domain walls, the LD patterns in both materials show peculiar sinusoidal waves of electronic nematicity with mesoscopic wavelength. The analysis reveals that the nematic order has an extremely long coherence length, more than 1000 times longer than the unit cell. Our direct visualization of electronic spatial variation uncovers a new fundamental aspect of quantum liquid crystalline states of correlated electrons in IBSCs.
description: 15 pages, 4 figures, Supplementary materials
On heterotic model constraints
Creators: name: Bouchard, Vincent
name: Donagi, Ron
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The constraints imposed on heterotic compactifications by global consistency and phenomenology seem to be very finely balanced. We show that weakening these constraints, as was proposed in some recent works, is likely to lead to frivolous results. In particular, we construct an infinite set of such frivolous models having precisely the massless spectrum of the MSSM and other quasi-realistic features. Only one model in this infinite collection (the one constructed in arXiv:hep-th/0512149) is globally consistent and supersymmetric. The others might be interpreted as being anomalous, or as non-supersymmetric models, or as local models that cannot be embedded in a global one. We also show that the strongly coupled model of arXiv:hep-th/0512149 can be modified to a perturbative solution with stable SU(4) or SU(5) bundles in the hidden sector. We finally propose a detailed exploration of heterotic vacua involving bundles on Calabi-Yau threefolds with Z_6 Wilson lines; we obtain many more frivolous solutions, but none that are globally consistent and supersymmetric at the string scale.
description: 38 pages
Swelling Dynamics of a Disk-Shaped Gel
Creators: name: Man, Xingkun
name: Doi, Masao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: When a gel absorbs solvent from surrounding, stress field is created in the gel, and this causes complex dynamics of the swelling behavior. Here we study this effect for disk-shaped gel by rigorously solving the diffusio-mechanical coupling equation. We show that (a) while the macroscopic thickness and the radius of the gel increases monotonically in time, the gel is compressed near the mid-plane, and that (b) while the swelling time depends on the shear modulus $G$ of the gel, its dependence is weak, and the time is mainly determined by the friction constant of the gel network and the osmotic bulk modulus of the gel. We also show that these characteristic features are reproduced accurately by a simple variational calculation for the gel deformation. An analytical expression is given for the swelling time.
description: 17 pages, 5 figures, to be appeared in Macromolecules
Spectroscopic analysis of finite size effects around a Kondo quantum dot
Creators: name: Simon, Pascal
name: Feinberg, Denis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a simple setup in which a small quantum dot is strongly connected to a finite size box. This box can be either a metallic box or a finite size quantum wire.The formation of the Kondo screening cloud in the box strongly depends on the ratio between the Kondo temperature and the box level spacing. By weakly connecting two metallic reservoirs to the quantum dot, a detailed spectroscopic analysis can be performed. Since the transport channels and the screening channels are almost decoupled, such a setup allows an easier access to the measure of finite-size effects associated with the finite extension of the Kondo cloud.
description: contribution to Les Houches proceeding, ``Quantum magnetism'' 2006
Protospondylis Linsley 1942
Creators: name: Santos-Silva, Antonio
name: Shute, Sharon
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Protospondylis

description: Revalidation of Protospondylis Linsley, |942 Vitali (2006) considered Protospondylis Linsley, 1942 to be synonymous with Parandra Latreille, 1804. However this was a tentative placement and we believe that it is not possible to affirm that Protospondylis is a true Parandrinae based on the figure of the fossil and the characters discussed by Vitali. Vitali states (p.24) that ‘‘The conservation of this fossil makes it diffi cult to use the key to genera provided by Santos-Silva (2002) ’’ thus it is impossible to establish, without doubt, that Protospondylis is synonymous with Parandra sensu lato. To solve this problem we are revalidating Protospondylis as a genus different from Parandra sensu lato, and place it incertae sedis in the Cerambycidae until its true taxonomic position can be resolved by the discovery of further specimens of Protospondylis florissantensis (Wickham, 1920).
description: Published as part of Santos-Silva, Antonio & Shute, Sharon, 2009, The identity of Parandra laevis Latreille, 1804 and nomenclatural changes in the Parandrinae (Coleoptera, Cerambycidae), pp. 19-35 in ZooKeys 25 (25) on page 32, DOI: 10.3897/zookeys.25.245, http://zenodo.org/record/576555
description: {"references": ["Vitali F (2006) Th e real taxonomic position of Spondylis florissantensis Wickham, 1920 (Coleoptera, Cerambycidae). Entomapeiron (P. S.) 1: 13 - 28.", "Latreille PA (1804) Histoire Naturelle, generale et particuliere des Crustaces et des Insectes Insectes faisant suite aus OEuvres de Leclerc de Buffon, et partie d complet d'histoire naturelle redige par C. S. Sonnini \u2026 Principes elementaires. F. Dufart, Paris, 11: iv + 1 - 424.", "Santos-Silva A (2002) Notas e descricoes em Parandrini (Coleoptera, Cerambycidae, Parandrinae). Iheringia (Serie Zoologia) 92: 29 - 52, 56 figs."]}
Newtonian Event-Chain Monte Carlo and Collision Prediction with Polyhedral Particles
Creators: name: Klement, Marco
name: Lee, Sangmin
name: Anderson, Joshua A.
name: Engel, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Polyhedral nanocrystals are building blocks for nanostructured materials that find applications in catalysis and plasmonics. Synthesis efforts and self-assembly experiments have been assisted by computer simulations that predict phase equilibra. Most current simulations employ Monte Carlo methods, which generate stochastic dynamics. Collective and correlated configuration updates are alternatives that promise higher computational efficiency and generate trajectories with realistic dynamics. One such alternative involves event-chain updates and has recently been proposed for spherical particles. In this contribution, we develop and apply event-chain Monte Carlo for hard convex polyhedra. Our simulation makes use of an improved computational geometry algorithm XenoSweep, which predicts sweep collision in a particularly simple way. We implement Newtonian event chains in the open source general-purpose particle simulation toolkit HOOMD-blue for serial and parallel simulation. The speed-up over state-of-the-art Monte Carlo is between a factor of 10 for nearly spherical polyhedra and a factor of 2 for highly aspherical polyhedra. Finally, we validate the Newtonian event-chain algorithm by applying it to a current research problem, the multi-step nucleation of two classes of hard polyhedra.
description: 12 pages, 13 figures