cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ophiogaleus , Thuy 2013
Creators: name: Rousseau, Julie
name: Gale, Andrew Scott
name: Thuy, Ben
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Ophiuroidea
Ophiurida
Ophiacanthidae
Ophiogaleus

description: Genus Ophiogaleus Thuy, 2013   Type species
 Ophiacantha ? constricta Hess, 1966, by original designation.   Extended diagnosis
Ophiacanthid with disc covered in minute, thin, rounded scales bearing short, conical spines. Radial shields oval, elongate, shorter than three times the disc radius. Jaws long, with small, oval, elongate oral papillae, two to three at the jaw apex and at least five along the jaw edge. Numerous spines (generally at least seven) reaching the length of two arm segments and positioned on ear-shaped spine articulations on a strongly elevated distal portion of lateral arm plates; dorsal and ventral lobes of spine articulations merged into continuous lobe; outer surface of lateral arm plates with moderately coarsely meshed stereom; ridge on inner side composed of short, narrow, oblique central part with generally strongly widened, triangular dorsal portion with nearly vertical distal edge and pointed dorsal and ventro-proximal tips; generally several spurs at least on inner distal edge of lateral arm plates; arm spines forming fan dorsally at least in proximal arm segments; row of spine articulations commonly protruding ventrally. Ventral portion of lateral arm plate wide and abutting along the arm midline on at least half the length of an arm segment. One to two rounded triangular tentacle pores.
description: Published as part of Rousseau, Julie, Gale, Andrew Scott & Thuy, Ben, 2018, New articulated asteroids (Echinodermata, Asteroidea) and ophiuroids (Echinodermata, Ophiuroidea) from the Late Jurassic (Volgian / Tithonian) of central Spitsbergen, pp. 1-26 in European Journal of Taxonomy 411 on page 12, DOI: 10.5852/ejt.2018.411, http://zenodo.org/record/3805999
Constraining the primordial black hole scenario with Bayesian inference and machine learning: the GWTC-2 gravitational wave catalog
Creators: name: Wong, Kaze W. K.
name: Franciolini, Gabriele
name: De Luca, Valerio
name: Baibhav, Vishal
name: Berti, Emanuele
name: Pani, Paolo
name: Riotto, Antonio
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Primordial black holes (PBHs) might be formed in the early Universe and could comprise at least a fraction of the dark matter. Using the recently released GWTC-2 dataset from the third observing run of the LIGO-Virgo Collaboration, we investigate whether current observations are compatible with the hypothesis that all black hole mergers detected so far are of primordial origin. We constrain PBH formation models within a hierarchical Bayesian inference framework based on deep learning techniques, finding best-fit values for distinctive features of these models, including the PBH initial mass function, the fraction of PBHs in dark matter, and the accretion efficiency. The presence of several spinning binaries in the GWTC-2 dataset favors a scenario in which PBHs accrete and spin up. Our results indicate that PBHs may comprise only a fraction smaller than $0.3 \%$ of the total dark matter, and that the predicted PBH abundance is still compatible with other constraints.
description: 14 pages, 5 figures. v2: matching published version
USA Today Poll # 1315
Creators: name: USA Today
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: 1984 Presidential election: likelihood of voting, opinion of Reagan, Mondale, Glenn, Jackson, Hart, McGovern; registered Democrats only-first/second choice for nomination: Mondale, Glenn, McGovern, Hart, Jackson, Askew, Hollings, Cranston; rate Reagan/Mondale/Hart on: ability to lead country, new ideas, communicate to public, experience, concern for needs/problems of people like respondent, handle international crises, freedom from special interests, compassion, work hard/stay vigorous; vote for Reagan/Mondale, Reagan/Hart; experience with inpatient/outpatient treatment: too long a wait, rude treatment, unsatisfactory medical treatment, adequate explanations, reasonable charges, first class care, re-visit same hospital; agree/disagree: hospitals provide high quality care, primarily concerned with money/convenience, no legal action against honest mistakes, bad management, administrators unaware of patients' problems, disorganization causes long waits, staff unskilled dealing with patient problems/concerns; federal tax system: fairness, advantages to special interest, percentage who cheat, chances of getting caught, approval/disapproval of cheating; agree/disagree: federal income tax discourages people from working, would work harder if taxed a lower rate, discourages people from working would work harder if taxed at a lower rate unfair/helpful, auditing makes one feel like a criminal, tougher enforcement little effect on cheating, tax laws give special advantages to rich; labor union membership, party affiliation.
Effective Supergravity from the Weakly Coupled Heterotic String
Creators: name: Gaillard, Mary K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The motivation for Calabi-Yau-like compactifications of the weakly coupled $E_8\otimes E_8$ heterotic string theory, its particle spectrum and the issue of dilaton stabilization are briefly reviewed. Modular invariant models for hidden sector condensation and supersymmetry breaking are described at the quantum level of the effective field theory. Their phenomenological and cosmological implications, including a possible origin for R-parity, are discussed.
description: 17 pages, Talk presented at the Symposium in honor of Julius Wess, Jan. 10--11, 2004
Energy nonequipartition in a collisional model of a confined quasi-two-dimensional granular mixture
Creators: name: Brito, Ricardo
name: Soto, Rodrigo
name: Garzó, Vicente
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A collisional model of a confined quasi-two-dimensional granular mixture is considered to analyze homogeneous steady states. The model includes an effective mechanism to transfer the kinetic energy injected by vibration in the vertical direction to the horizontal degrees of freedom of grains. The set of Enskog kinetic equations for the velocity distribution functions of each component is derived first to analyze the homogeneous state. As in the one-component case, an exact scaling solution is found where the time dependence of the distribution functions occurs entirely through the granular temperature $T$. As expected, the kinetic partial temperatures $T_i$ of each component are different and hence, energy equipartition is broken down. In the steady state, explicit expressions for the temperature $T$ and the ratio of partial kinetic temperatures $T_i/T_j$ are obtained by considering Maxwellian distributions defined at the partial temperatures $T_i$. The (scaled) granular temperature and the temperature ratios are given in terms of the coefficients of restitution, the solid volume fraction, the (scaled) parameters of the collisional model, and the ratios of mass, concentration, and diameters. In the case of a binary mixture, the theoretical predictions are exhaustively compared with both direct simulation Monte Carlo and molecular dynamics simulations with a good agreement. The deviations are identified to be originated in the non-Gaussianity of the velocity distributions and on microsegregation patterns, which induce spatial correlations not captured in the Enskog theory.
description: 16 pages, 10 figures; to be published in Phys. Rev. E
Planar coincidences for N-fold symmetry
Creators: name: Pleasants, Peter A. B.
name: Baake, Michael
name: Roth, Johannes
Publisher: name: arXiv
Year: 2005
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52C05; 52C23

description: The coincidence problem for planar patterns with $N$-fold symmetry is considered. For the N-fold symmetric module with $N<46$, all isometries of the plane are classified that result in coincidences of finite index. This is done by reformulating the problem in terms of algebraic number fields and using prime factorization. The more complicated case $N \ge 46$ is briefly discussed and N=46 is described explicitly. The results of the coincidence problem also solve the problem of colour lattices in two dimensions and its natural generalization to colour modules.
description: 38 pages, 4 figures; updated and slightly corrected version of a paper published in J. Math. Phys. (see below)
Quantum Annealing in a Kinetically Constrained System
Creators: name: Das, Arnab
name: Chakrabarti, Bikas K.
name: Stinhcombe, Robin B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Classical and quantum annealing is discussed for a kinetically constrained chain of $N$ non-interacting asymmetric double wells, represented by Ising spins in a longitudinal field $h$. It is shown that in certain cases, where the kinetic constraints may arise from infinitely high but vanishingly narrow barriers appearing in the relaxation path of the system, quantum annealing exploiting the quantum-mechanical penetration of sufficiently narrow barriers may be far more efficient than its thermal counterpart. We have used a semiclassical picture of scattering dynamics to do our simulation for the quantum system.
description: 5 pages, 3 figures
Quantitative Assessment of Finite-element Models for Magnetostatic Field Calculations
Creators: name: Crittenden, J. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences
subject: G.1.1; G.1.2; G.1.4; G.1.6; G.3; G.4; J.2
subject: 78-04 (Primary) 41-00, 65D05, 65D10, 65D15, 65D17, 65D30, 65D32 (Secondary)

description: We present quantitative means for assessing the numerical accuracy of static magnetic field calculations in finite-element models. Our calculations use the three-dimensional Opera simulation software suite of Dassault Syst`emes. Our need to assess the effects of fringe fields requires such a 3D algorithm. While we do discuss and compare our approach to a method of accuracy estimation used in the Opera post-processor, our methods are generally applicable to any model using relaxation techniques in finite-element systems. For purposes of illustration, we present modeling and analysis of two types of quadrupole electromagnets presently in operation in the south arc of the Cornell Electron Storage Ring (CESR). Calculations of field multipole expansion coefficients and numerical deviations from Maxwell's equations in source-free regions are discussed, with emphasis on the dependence of their accuracy on changes to the finite-element model. Successive refinement steps in the finite-element model for the non-extraction type of CESR south arc quadrupole achieve a reduction in the RMS value of the longitudinal component of the curl vector on the magnet axis by a factor of nearly 70 from $4.38 \times 10^{-2}$ T/m to $6.36 \times 10^{-4}$ T/m, which is 0.0021% of the field gradient. An accuracy of 2.9% is achieved for a dodecapole coefficient of $2.4 \times 10^{-4}$ of that of the quadrupole in the longitudinal integral of the vertical field gradient at a radius of 1 cm.
description: Updated with accepted manuscript. 22 pages, 10 figures, 3 tables, 23 citations
Covariance properties and regularization of conserved currents in tetrad gravity
Creators: name: Obukhov, Yuri N.
name: Rubilar, Guillermo F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the properties of the gravitational energy-momentum 3-form within the tetrad formulation of general relativity theory. We derive the covariance properties of the quantities describing the energy-momentum content under Lorentz transformations of the tetrad. As an application, we consider the computation of the total energy (mass) of some exact solutions of Einstein's general relativity theory which describe compact sources with asymptotically flat spacetime geometry. As it is known, depending on the choice of tetrad frame, the formal total integral for such configurations may diverge. We propose a natural regularization method which yields finite values for the total energy-momentum of the system and demonstrate how it works on a number of explicit examples.
description: 36 pages, Revtex, no figures; small changes, published version
ROLE OF TYROSYL-DNA PHOSPHODIESTERASE (TDP 1) ON REPAIR OF 3′-PHOSPHOGLYCOLATE (3′- PG) TERMINATED DNA DOUBLE-STRAND BREAKS (DSBS) AND IN RESPONSE TO OXIDATIVE STRESS
Creators: name: Zhou, Tong
Publisher: name: VCU Libraries
Year: 2012

description: VCU Theses and Dissertations
High-order maximum-entropy collocation methods
Creators: name: Greco, F.
name: Arroyo, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This paper considers the approximation of partial differential equations with a point collocation framework based on high-order local maximum-entropy schemes (HOLMES). In this approach, smooth basis functions are computed through an optimization procedure and the strong form of the problem is directly imposed at the collocation points, reducing significantly the computational times with respect to the Galerkin formulation. Furthermore, such a method is truly meshless, since no background integration grids are necessary. The validity of the proposed methodology is verified with supportive numerical examples, where the expected convergence rates are obtained. This includes the approximation of PDEs on domains bounded by implicit and explicit (NURBS) curves, illustrating a direct integration between the geometric modeling and the numerical analysis.
Ophioculina Rousseau & Gale & Thuy 2018, gen. nov.
Creators: name: Rousseau, Julie
name: Gale, Andrew Scott
name: Thuy, Ben
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Ophiuroidea
Ophiurida
Ophiopyrgidae
Ophioculina

description: Ophioculina Rousseau & Thuy gen. nov.
urn:lsid:zoobank.org:act: E82E3C6B-7193-4082-9FDD-6549411E1EFB  Type species
 Ophioculina hoybergia Rousseau & Thuy gen. et sp. nov., by original designation.   Diagnosis
Dorsal disc with numerous, small, thin scales. Well-developed arm comb. Tentacle pores developed as between-plate openings pointing ventro-distalwards until median arm then reduced to within-plate perforations.  Etymology
 From the Latin ‘ culina ’, kitchen, since most of the specimens where discovered accidentally while clearing a surface area for the kitchen tent of the 2010 field camp.
description: Published as part of Rousseau, Julie, Gale, Andrew Scott & Thuy, Ben, 2018, New articulated asteroids (Echinodermata, Asteroidea) and ophiuroids (Echinodermata, Ophiuroidea) from the Late Jurassic (Volgian / Tithonian) of central Spitsbergen, pp. 1-26 in European Journal of Taxonomy 411 on page 16, DOI: 10.5852/ejt.2018.411, http://zenodo.org/record/3805999
Coil-stretch-like transition of elastic sheets in extensional flows
Creators: name: Yu, Yijiang
name: Graham, Michael D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The conformation of a long linear polymer dissolved in fluid and exposed to an extensional flow is well-known to exhibit a "coil-stretch" transition, which for sufficiently long chains can lead to bistability. The present work reports computations indicating that an analogous "compact-stretched" transition arises in the dynamics of a thin elastic sheet. Sheets of nominally circular, square or rectangular shape are simulated in planar and biaxial flows using a finite element method for the sheet conformations and a regularized Stokeslet method for the fluid flow. If a neo-Hookean constitutive model is used for the sheet elasticity, the sheets will stretch without bound once a critical extension rate, as characterized nondimensionally by a capillary number, is exceeded. Nonlinear elasticity, represented with the Yeoh model, arrests the stretching, leading to a highly-stretched steady state once the critical capillary number is exceeded. For all shapes and in both planar and biaxial extension, a parameter regime exists in which both weakly stretched (compact) and strongly stretched states can be found, depending on initial conditions. I.e. this parameter regime displays bistability. As in the long-chain polymer case, the bistable behavior arises from the hydrodynamic interaction between distant elements of the sheet, and vanishes if these interactions are artificially screened by use of a Brinkman model for the fluid motion. While the sheets can transiently display wrinkled shapes, all final shapes in planar and biaxial extension are planar.
description: 10 pages, 12 figures. Accepted by Soft Matter
Online Photometric Calibration of Automatic Gain Thermal Infrared Cameras
Creators: name: Das, Manash Pratim
name: Matthies, Larry
name: Daftry, Shreyansh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Thermal infrared cameras are increasingly being used in various applications such as robot vision, industrial inspection and medical imaging, thanks to their improved resolution and portability. However, the performance of traditional computer vision techniques developed for electro-optical imagery does not directly translate to the thermal domain due to two major reasons: these algorithms require photometric assumptions to hold, and methods for photometric calibration of RGB cameras cannot be applied to thermal-infrared cameras due to difference in data acquisition and sensor phenomenology. In this paper, we take a step in this direction, and introduce a novel algorithm for online photometric calibration of thermal-infrared cameras. Our proposed method does not require any specific driver/hardware support and hence can be applied to any commercial off-the-shelf thermal IR camera. We present this in the context of visual odometry and SLAM algorithms, and demonstrate the efficacy of our proposed system through extensive experiments for both standard benchmark datasets, and real-world field tests with a thermal-infrared camera in natural outdoor environments.
description: 8 pages, 6 figures, Pre-Print. This work has been submitted to the IEEE for possible publication
COMMUNICATIVE COMPETENCE AS A FACTOR OF PERSONAL AND PROFESSIONAL DEVELOPMENT OF A FUTURE SPECIALIST
Creators: name: Ataullayeva, Maxbuba
Publisher: name: Zenodo
Year: 2024

description: this article explores the significance of communicative competence as a pivotal factor in the personal and professional development of future specialists. Effective communication skills are essential for individuals embarking on their professional journeys. They play a crucial role in building relationships, fostering collaboration, and achieving success in various fields. The development of communicative competence empowers future specialists to navigate complex social and professional landscapes, enhancing their overall growth and efficacy.
COOL-LAMPS I. An Extraordinarily Bright Lensed Galaxy at Redshift 5.04
Creators: name: Khullar, Gourav
name: Gozman, Katya
name: Lin, Jason J.
name: Martinez, Michael N.
name: Acuña, Owen S. Matthews
name: Medina, Elisabeth
name: Merz, Kaiya
name: Sanchez, Jorge A.
name: Sisco, Emily E.
name: Stein, Daniel J. Kavin
name: Sukay, Ezra O.
name: Tavangar, Kiyan
name: Bayliss, Matthew B.
name: Bleem, Lindsey E.
name: Brownsberger, Sasha
name: Dahle, Håkon
name: Florian, Michael K.
name: Gladders, Michael D.
name: Mahler, Guillaume
name: Rigby, Jane R.
name: Sharon, Keren
name: Stark, Antony A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the discovery of COOL J1241+2219, a strongly-lensed galaxy at redshift $z$=5.043$\pm$0.002 with observed magnitude $z_{AB}=20.47$, lensed by a moderate-mass galaxy cluster at $z$=1.001$\pm$0.001. COOL J1241+2219 is the brightest lensed galaxy currently known at optical and near-infrared wavelengths at $z$ $\gtrsim$ 5; it is $\sim$5 times brighter than the prior record-holder lensed galaxy, and several magnitudes brighter than the brightest unlensed galaxies known at these redshifts. It was discovered as part of COOL-LAMPS, a collaboration initiated to find strongly lensed systems in recent public optical imaging data. We characterise the lensed galaxy, as well as the central galaxy of the lensing cluster using ground-based $griz$JH imaging and optical spectroscopy. We report model-based magnitudes, and derive stellar masses, dust content, metallicity and star-formation rates via stellar-population synthesis modeling. Our lens mass modeling, based on ground-based imaging, implies a median source magnification of $\sim$30, which puts the stellar mass and star formation rate (in the youngest age bin, closest to the epoch of observation) at logM$_{*}$ = $10.11^{+0.21}_{-0.26}$ and SFR = $27^{+13}_{-9}$ M$_{\odot}$/yr, respectively. We constrain a star formation history for COOL J1241+2219 consistent with constant star formation across $\sim$1 Gyr of cosmic time, and that places this galaxy on the high-mass end of the star-forming main sequence. COOL J1241+2219 is 2-4 times more luminous than a galaxy with the characteristic UV luminosity at these redshifts. The UV continuum slope $β$= -2.2$\pm$0.2 places this galaxy on the blue side of the observed distribution of galaxies at $z$=5, although the lack of Ly$α$ emission indicates dust sufficient to suppress this emission.
description: Accepted in the Astrophysical Journal, December 2020 (in production). 16 pages, 7 figures, 2 tables
Chemical Composition in the Globular Cluster M71 from Keck/HIRES Spectra of Turn-Off Stars
Creators: name: Boesgaard, Ann Merchant
name: King, Jeremy R.
name: Cody, Ann Marie
name: Stephens, Alex
name: Deliyannis, Constantine P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have made observations with the Keck I telescope and HIRES at a resolution of $\sim$45,000 of five nearly identical stars at the turn-off of the metal-rich globular cluster M 71. Our mean Fe abundance, [Fe/H]=-0.80 +-0.02, is in excellent agreement with previous cluster determinations from both giants and near-turnoff stars. There is no clear evidence for any star-to-star abundance differences or correlations in our sample. Abundance ratios of the Fe-peak elements (Cr, Ni) are similar to Fe. The turn-off stars in M71 have remarkably consistent enhancements of 0.2 - 0.3 dex in [Si/Fe], [Ca/Fe] and [Ti/Fe] -- like the red giants. Our [Mg/Fe] ratio is somewhat lower than that suggested by other studies. We compare our mean abundances for the five M 71 stars with field stars of similar [Fe/H] -- 8 with halo kinematics and 17 with disk kinematics. The abundances of the alpha-fusion products (Mg, Si, Ca, Ti) agree with both samples, but seem a closer match to the disk stars. The Mg abundance in M71 is at the lower edge of the disk and halo samples. The neutron-capture elements, Y and Ba, are enhanced relative to solar in the M71 turn-off stars. Our ratio [Ba/Fe] is similar to that of the halo field stars but a factor of two above that for the disk field stars. The important [Ba/Y] ratio is significantly lower than M71 giant values. The Na content of the M71 turn-off stars is remarkably similar to that in the disk field stars, but more than a factor of two higher than the halo field star sample. We find [Na/Fe] = +0.14 $\pm$0.04 with a spread less than half of that found in the red giants in M71. Excluding Mg, the lack of intracluster $α$-element variations (turn-off vs giants) suggests the polluting material arose in a more traditional $s$-process environment such as AGB stars.
description: Accepted for Ap.J. August 20, 2005 issue 25 pages, 9 figures, 9 tables
Interferometric Visibility in Curved Spacetimes
Creators: name: Basso, Marcos L. W.
name: Maziero, Jonas
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In [M. Zych et al., Nat. Commun. 2, 505 (2011)], the authors predicted that the interferometric visibility is affected by a gravitational field in way that cannot be explained without the general relativistic notion of proper time. In this work, we take a different route and start deriving the same effect using the unitary representation of the local Lorentz transformation in the Newtonian Limit. In addition, we show that the effect on the interferometric visibility due to gravity persists in different spacetime geometries. However, the influence is not necessarily due to the notion of proper time. For instance, by constructing a `astronomical' Mach-Zehnder interferometer in the Schwarzschild spacetime, the influence on the interferometric visibility can be due to another general relativistic effect, the geodetic precession. Besides, by using the unitary representation of the local Lorentz transformation, we show that this behavior of the interferometric visibility is general for an arbitrary spacetime, provided that we restrict the motion of the quanton to a two-dimensional spacial plane.
description: 11 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:2011.00736, arXiv:2102.09623
q-Deformed Statistical-Mechanical Property in the Dynamics of Trajectories en route to the Feigenbaum Attractor
Creators: name: Robledo, A.
name: Moyano, L. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We demonstrate that the dynamics towards and within the Feigenbaum attractor combine to form a q-deformed statistical-mechanical construction. The rate at which ensemble trajectories converge to the attractor (and to the repellor) is described by a q-entropy obtained from a partition function generated by summing distances between neighboring positions of the attractor. The values of the q-indices involved are given by the unimodal map universal constants, while the thermodynamic structure is closely related to that formerly developed for multifractals. As an essential component in our demonstration we expose, at a previously unknown level of detail, the features of the dynamics of trajectories that either evolve towards the Feigenbaum attractor or are captured by its matching repellor. The dynamical properties of the family of periodic superstable cycles in unimodal maps are seen to be key ingredients for the comprehension of the discrete scale invariance features present at the period-doubling transition to chaos. We make clear the dynamical origin of the anomalous thermodynamic framework existing at the Feigenbaum attractor.
description: 16 pages, 24 figures. Final published version. Minor corrections and typos added
Stability of Three Unit Charges. Necessary Conditions
Creators: name: Gridnev, D. K.
name: Greiner, C.
name: Greiner, W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the stability of three Coulomb charges $\{+1, -1, -1 \}$ with finite masses in the framework of nonrelativistic quantum mechanics. A simple physical condition on masses is derived to guarantee the absence of bound states below the dissociation thresholds. In particular this proves that certain negative muonic ions are unstable, thus extending the old result of Thirring \cite{thirring} to the actual values of all masses. The proof is done by reducing the initial problem to the question of binding of one particle in some effective potential.
description: 10 pages
SuperBoRG: Exploration of point sources at $z\sim8$ in HST parallel fields
Creators: name: Morishita, T.
name: Stiavelli, M.
name: Trenti, M.
name: Treu, T.
name: Roberts-Borsani, G. W.
name: Mason, C. A.
name: Hashimoto, T.
name: Bradley, L.
name: Coe, D.
name: Ishikawa, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: To extend the search for quasars in the epoch of reionization beyond the tip of the luminosity function, we explore point source candidates at redshift $z\sim8$ in SuperBoRG, a compilation of $\sim$0.4deg$^2$ archival medium-deep ($m_{\rm F160W}\sim 26.5$ABmag, 5$σ$) parallel IR images taken with the Hubble Space Telescope (HST). Initial candidates are selected by using the Lyman-break technique. We then carefully analyze source morphology, and robustly identify 3 point sources at $z\sim8$. Photometric redshift analysis reveals that they are preferentially fit by extra-galactic templates, and we conclude that they are unlikely to be low-$z$ interlopers, including brown dwarfs. A clear IRAC ch2 flux excess is seen in one of the point sources, which is expected if the source has strong H$β$+[O III] emission with rest-frame equivalent width of $\sim3000$AA. Deep spectroscopic data taken with Keck/MOSFIRE, however, do not reveal Ly$α$ emission from the object. In combination with the estimated H$β$+[O III] equivalent width, we place an upper limit on its Ly$α$ escape fraction $f_{\rm esc, Lyα}< 2 \%$. We estimate the number density of these point sources $\sim1\times10^{-6}$Mpc$^{-3}$mag$^{-1}$ at $M_{\rm UV}\sim-23$mag. The final interpretation of our results remains inconclusive: extrapolation from low-$z$ studies of $faint$ quasars suggests that $>100\times$ survey volume may be required to find one of this luminosity. The James Webb Space Telescope will be able to conclusively determine the nature of our luminous point source candidates, while the Roman Space Telescope will probe $\sim 200$ times the area of the sky with the same observing time considered in this HST study.
description: Accepted for publication in ApJ. 11 pages, 7 figures, 4 tables
$J$-pairing interaction, number of states, and nine-$j$ sum rules of four identical particles
Creators: name: Zhao, Y. M.
name: Arima, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper we study $J$-pairing Hamiltonian and find that the sum of eigenvalues of spin $I$ states equals sum of norm matrix elements within the pair basis for four identical particles such as four fermions in a single-$j$ shell or four bosons with spin $l$. We relate number of states to sum rules of nine-$j$ coefficients. We obtained sum rules for nine-$j$ coefficients $$ and $$ summing over (1) even $J$ and $K$, (2) even $J$ and odd $K$, (3) odd $J$ and odd $K$, and (4) both even and odd $J,K$, where $j$ is a half integer and $l$ is an integer.
description: 6 pages, no figure, updated version, to be published. Physical Review C, in press
Participation, internalisation and differentiation : understanding YouTube user agency through YouTubing practice
Creators: name: Gu, Jie
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: HM851.G8 2012
subject: YouTube (Electronic resource)
subject: Online social networks Social aspects
subject: Internet Social aspects
subject: Information society

description: In the participatory era of new media, a multidisciplinary approach to new media user agency is expected since the increasing diffusion of new media use in various social fields has generated multifarious user roles and activities. This new approach is also expected to overcome the insufficiencies of methodological individualism and wholism which have long dominated the research discipline of new media user agency and activity. This thesis applies the insights of practice theories to the study of YouTube user agency through an 18 months' participant observation study within the Australian context (23 semi-structured interviews and a self-reflexive participant observation through uploading YouTube videos in person). Unlike individualistic and wholistic approaches to human agency, practice theories insist that the social and collective organization of practices is the everyday pivot between structure and agency. Based on this rationale, I develop a new practice approach in my thesis which understands YouTube users as social actors who carry out YouTubing practice in social life. I suggest that YouTube user agency is decided neither by individualistic parameters nor by structural forces but by the organization of YouTubing practice. I examine three issues in my thesis which are concerned with YouTube user agency from a practice perspective. Firstly, I investigate people's motivations for uploading and sharing videos on YouTube through examining the process through which my respondents participate in YouTubing practice. The result reveal how the ways in which YouTubing practice relate to other social practices in my respondents' world influence their YouTubing participation. Secondly, I find that YouTubing practice is organized by two key constitutive elements: a sense of audience and individuals' beliefs concerned with a sense of audience. I then demonstrate how these two key constitutive elements are developed by the joint forces of my respondents' intelligibilities and the elements involved in YouTubing practice. These findings help us understand how YouTube user agency is rooted in the organization of YouTubing practice. This thesis lastly identifies four types of YouTubing performances which represent my respondents' differentiated participation levels and engagement.
title: The austerity of time: living with neoliberalism, financialization, and difference in London’s Docklands
Creators: name: Vieira, Jordan Patrick
Publisher: name: London School of Economics and Political Science (LSE)
Year: 2021

description: Based on twenty-four months of ethnographic fieldwork that drew upon relationships cultivated over several years, this thesis explores how abstract time is materialized in the everyday lives of people on the Isle of Dogs in London. Bound by the Thames on three sides and a series of interlocking quays on the fourth, the Isle of Dogs is the geographically distinct heart of London’s Docklands that had historically been home to a homogeneous white, working-class community for nearly two centuries. This changed with the closing of the docks, the financialization of the British economy, increased (im)migration of finance professionals alongside the proximal construction of the Canary Wharf financial hub in the 1990s, and the austerity policies of recent governments. Against this backdrop of a shrinking state, market competition, and political upheaval evidenced by the UK’s departure from the European Union, the thesis argues and investigates four core points. First, that issues of time are vital, though often taken-for-granted and underexplored, aspects of social life that deserve explicit ethnographic engagement in various registers of lived experience. Second, that constructions of time, continuity, and money are mutually constitutive of each other and generative of widespread impatience exacerbated by a sense of time lack and imminent rupture. Such anxiety manifests in various interrelated social issues seen in part in housing, crime, ideas of belonging, and class tension. Third, given the above, that time and money share congruent notions of transaction and management, which form particular social practices and interpersonal relationships. Finally, that these points underscore a tension between competitive accumulation and social accommodation (and the conditions under which people vacillate between the two) amid desires to create or prolong desired actualizations of lifestyle and social reproduction within an ultimately finite (differentiated) living present. The thesis examines these themes through the lens of a pub with a precarious existence and the life courses and rhythms of its landlords, staff, and patrons. It follows an overarching narrative that concludes with the pub’s closure, an event that encapsulates and exemplifies the key points discussed throughout.
Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids
Creators: name: Reichhardt, C.
name: Reichhardt, C. J. Olson
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We simulate a colloid with charge q_d driven through a disordered assembly of interacting colloids with charge q and show that, for q_d \approx q, the velocity-force relation is nonlinear and the velocity fluctuations of the driven particle are highly intermittent with a 1/f characteristic. When q_d >> q, the average velocity ddrops, the velocity force relation becomes linear, and the velocity fluctuations are Gaussian. We discuss the results in terms of a crossover from strongly intermittent heterogeneous dynamics to continuum dynamics. We also make several predictions for the transient response in the different regimes.
description: 4 pages, 5 postscript figures. Version to appear in Physical Review Letters
NFDI4Objects: Task Area 2 "Collecting"
Creators: name: Baars, Stefanie
name: Heiduk, Matthias
name: Schäfer, Felix F.
name: Thiery, Florian
name: Busch, Alexandra Wilhelmine
name: Weisser, Bernhard
Publisher: name: Zenodo
Year: 2023

description: Kurzvorstellung der Task Area 2 "Collecting" im Rahmen des NFDI4Objects-Community Meetings 2023
Pushing run-and-tumble particles through a rugged channel
Creators: name: Bijnens, Bram
name: Maes, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze the case of run-and-tumble particles pushed through a rugged channel both in the continuum and on the lattice. The current characteristic is non-monotone in the external field with (1) the appearance of a current and nontrivial density profile even at zero field for asymmetric obstacles, (2) the current decreasing with persistence at small field and increasing with persistence at large field. Activity in terms of self-propulsion increases the maximal current and postpones dying. We give an effective theoretical description with wider validity.
Heuristic Methods and Performance Bounds for Photonic Design
Creators: name: Angeris, Guillermo
name: Vučković, Jelena
name: Boyd, Stephen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Optimization and Control (math.OC)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the photonic design problem, a scientist or engineer chooses the physical parameters of a device to best match some desired device behavior. Many instances of the photonic design problem can be naturally stated as a mathematical optimization problem that is computationally difficult to solve globally. Because of this, several heuristic methods have been developed to approximately solve such problems. These methods often produce very good designs, and, in many practical applications, easily outperform 'traditional' designs that rely on human intuition. Yet, because these heuristic methods do not guarantee that the approximate solution found is globally optimal, the question remains of just how much better a designer might hope to do. This question is addressed by performance bounds or impossibility results, which determine a performance level that no design can achieve. We focus on algorithmic performance bounds, which involve substantial computation to determine. We illustrate a variety of both heuristic methods and performance bounds on two examples. In these examples (and many others not reported here) the performance bounds show that the heuristic designs are nearly optimal, and can considered globally optimal in practice. This review serves to clearly set up the photonic design problem and unify existing approaches for calculating performance bounds, while also providing some natural generalizations and properties.
Proof of the volume conjecture for Whitehead doubles of a family of torus knots
Creators: name: Zheng, Hao
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25; 57M27

description: A technique to calculate the colored Jones polynomials of satellite knots, illustrated by the Whitehead doubles of knots, is presented. Then we prove the volume conjecture for Whitehead doubles of a family of torus knots and show some interesting observations.
description: 18 pages, 3 figures
Unitarity Bounds for Gauged Axionic Interactions and the Green-Schwarz Mechanism
Creators: name: Coriano, Claudio
name: Guzzi, Marco
name: Morelli, Simone
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the effective actions of anomalous models in which a four-dimensional version of the Green-Schwarz mechanism is invoked for the cancellation of the anomalies, and we compare it with those models in which gauge invariance is restored by the presence of a Wess-Zumino term. Some issues concerning an apparent violation of unitarity of the mechanism, which requires Dolgov-Zakharov poles, are carefully examined, using a class of amplitudes studied in the past by Bouchiat-Iliopoulos-Meyer (BIM), and elaborating on previous studies. In the Wess-Zumino case we determine explicitly the unitarity bound using a realistic model of intersecting branes (the Madrid model) by studying the corresponding BIM amplitudes. This is shown to depend significantly on the Stückelberg mass and on the coupling of the extra anomalous gauge bosons and allows one to identify Standard-Model-like regions (which are anomaly-free) from regions where the growth of certain amplitudes is dominated by the anomaly, separated by an inflection point which could be studied at the LHC. The bound can even be around 5-10 TeV's for a $Z'$ mass around 1 TeV and varies sensitively with the anomalous coupling. The results for the WZ case are quite general and apply to all the models in which an axion-like interaction is introduced as a generalization of the Peccei-Quinn mechanism, with a gauged axion.
description: 50 pages, 28 figures
Balzer, Friedrich-Martin / Schnell, Karl Ulrich, Der Fall Erwin Eckert
Creators: name: Müller, Wolfgang
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 37 Nr. 2 (1988): Ökumenische Rundschau, Band 37, Heft 2
Effect of Single-ion Anisotropy on Magnetocaloric Properties of Frustrated Spin-$s$ Ising Nanoclusters
Creators: name: Mohylna, Mariia
name: Žukovič, Milan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Effects of a single-ion anisotropy on magnetocaloric properties of selected spin-$s\geq 1$ antiferromagnetic Ising clusters with frustration-inducing triangular geometry are studied by exact enumeration. It is found that inclusion of the single-ion anisotropy parameter $D$ can result in a much more complex ground-state behavior, which is also reflected in a magnetocaloric effect (MCE) at finite temperatures. For negative $D$ (easy-plane anisotropy) with increasing $s$ the ground-state magnetization as a function of the external field gradually shows increasing number of plateaus of various heights. Except for the cases of integer $s$ with $D < D_0 \leq 0$, the first magnetization plateau is of non-zero height. This property facilitates an enhanced MCE in the adiabatic demagnetization process in the form of an abrupt decrease in temperature as the magnetic field vanishes to zero. The cooling rate can be considerably enhanced in the systems with larger $s$ and $D>0$ (easy-axis anisotropy), albeit its dependence on these parameters is strongly dependent on the cluster geometry. From the studied systems more favorable conditions for observing a giant MCE were found in the 2CS cluster, consisting of two corner-sharing tetrahedra, the experimental realization of which could be technologically used for efficient refrigeration to ultra-low temperatures.
description: 16 pages, 9 figures
The pariah case : some comments on the origin and evolution of primitive dogs and on the taxonomy of related species
Creators: name: Gonzalez, Antonio
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: QL737.C22 G66 2012
subject: Canis Evolution Asia
subject: Canis Origin
subject: Canis Evolution Australia
subject: Dogs Origin
subject: Paleontology Pleistocene

description: This thesis describes our current knowledge on the taxonomy and archaeology of some Asian, African and Australasian Canis and explores new approaches to their classification and identity, using the Asian pariah as a pivotal point. I analysed several populations of primitive dogs, and described processes of diversification. What in many places is simply designated "the village dog" is a subtype of the pariah; the Australian dingo is also connected to the pariah, although there are some peculiarities related to its non-domestic nature; and I propose a hypothesis on the nature of the pariah. Asian wolf populations contain substantial heterogeneity, and a review of the taxa lupus and pallipes and their intermediate forms in Asia is much needed. The so-called wolf jackal is an independent species from the golden jackal but the name Canis lupaster, frequently used for it, does not apply to it. Available documentary and collection data support a strong connection between C. mosbachensis and the pale footed wolf (Canis pallipes). A Pleistocene wolf skull from the Narmada Valley may exemplify the transition from the smaller wolves of the Pleistocene drylands to the larger types that populated the Levantine highlands during the Natufian. The Natufian dogs are a very variable group; Neolithic materials from the Middle East and South and Central Asia are morphologically closest to modern types of pariah. Finally the extensive sampling conducted during this work provided evidence of aberrant specimens among some of the studied populations.
Influences of Fly Ash on Concrete Product's Properties and Environmental Impact Reduction
Creators: name: Thipsuree Kornboonraksa
name: Thirdpong Srisukphun
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2015
Subjects: fly ash,Portland cement,global warming potential,ANOVA analysis

description: 1, 8, EnvironmentAsia
Response of Malaysian Local Rice Cultivars Induced by Elevated Ozone Stress
Creators: name: Marzuki Ismail, Azrin Suroto
name: Samsuri Abdullah
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2015
Subjects: biochemical expression,yield response,ground level ozone,local rice plants,Malaysia

description: 1, 8, EnvironmentAsia
An Analysis into the Temporal Variations of Ground Level Ozone in the Arid Climate of Makkah applying k-means Algorithms
Creators: name: Munir, Said
name: Turki M. Habeebullah
name: Mohammed, Atef M.F.
name: Morsy, Essam A.
name: Awad, Abdel Hameed A.H.
name: Abdulaziz R. Seroji
name: Hassan, Ibrahim A.
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2015
Subjects: ground level ozone,temporal variations,k-means algorithm,Makkah

description: 1, 8, EnvironmentAsia