cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Meetup Events in American Cities: A Data Tool for Economic Development and Nowcasting
Creators: name: CAI YING
Publisher: name: University of Chicago
Year: 2019
Subjects: subject: urban economics
subject: opensource data
subject: producivity
subject: social connectivity
subject: Meetup events
subject: labor economics

description: Based on opensource data from Meetup.com, which includes 329497 Meetup events that happened in America during the period from 2011 to 2018, this thesis investigates the following questions: What are the distribution patterns of Meetup events? How is the frequency of social interaction activities like Meetup events related with city agglomeration? Does higher social connectivity promotes productivity? How can we use large-scale opensource data like Meetup data to help us predict meaningful economics information? Adopting data visualization techniques, text analysis and economics models (eg. Difference in Difference model), this thesis gives two meaningful insights: (1) that Meetup events exhibits the same super-linear pattern with population in Geoffery West «Scale»(2017) and the coefﬁcient is also around 1.15. (2) Under simple linear regression and DID model, Higher Meetup events frequency, which is used to represent higher social connecting activities do demonstrate its effect on productivity. Generally, the median income in a city can be increased by 20-33 dollars on average if 100 more Meetup events are held there.
Uniform convergence rates and automatic variable selection in nonparametric regression with functional and categorical covariates
Creators: name: Selk, Leonie
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified

description: In Selk, L., and Gertheiss, J. [(2022), ‘Nonparametric Regression and Classification with Functional, Categorical, and Mixed Covariates’, Advances in Data Analysis and Classification] a nonparametric prediction method for models with multiple functional and categorical covariates is introduced. The dependent variable can be categorical (binary or multi-class) or continuous, so that both classification and regression problems are considered. In the paper at hand the asymptotic properties of this method are studied. A uniform convergence rate for the regression / classification estimator is given. It is further shown that a data-driven least squares cross-validation method can asymptotically remove irrelevant noise variables automatically.
Critical Points at Infinity, Non-Gaussian Saddles, and Bions
Creators: name: Behtash, Alireza
name: Dunne, Gerald V.
name: Schaefer, Thomas
name: Sulejmanpasic, Tin
name: Unsal, Mithat
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It has been argued that many non-perturbative phenomena in quantum mechanics (QM) and quantum field theory (QFT) are determined by complex field configurations, and that these contributions should be understood in terms of of Picard-Lefschetz theory. In this work we compute the contribution from non-BPS multi-instanton configurations, such as instanton-anti-instanton $[{I}\bar{I}]$ pairs, and argue that these contributions should be interpreted as exact critical points at infinity. The Lefschetz thimbles associated with such critical points have a specific structure arising from the presence of non-Gaussian, quasi-zero mode (QZM), directions. When fermion degrees of freedom are present, as in supersymmetric theories, the effective bosonic potential can be written as the sum of a classical and a quantum potential. We show that in this case the semi-classical contribution of the critical point at infinity vanishes, but there is a non-trivial contribution that arises from its associated non-Gaussian QZM-thimble. This approach resolves several puzzles in the literature concerning the semi-classical contribution of correlated $[{I}\bar{I}]$ pairs. It has the surprising consequence that the configurations that dominate the expansion of observables, and the critical points that define the Lefschetz thimble decomposition need not be the same, a feature not present in the traditional Picard-Lefschetz approach.
description: 31 pages, v2: fixed hyperlinks to references, minor edits
Extended Einstein-Maxwell model
Creators: name: Balakin, A. B.
Publisher: name: arXiv
Year: 2007
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: A self-consistent extended Einstein-Maxwell model for relativistic non-stationary polarizable-magnetizable anisotropic media is presented. Based on the analogy with relativistic extended irreversible (transient) thermodynamics, the extended constitutive equations for the electrodynamics of continua are formulated phenomenologically, the convective derivatives of the first, second, etc. orders being taken into account. The master equations for the gravity field contain a modified effective (symmetric) stress-energy tensor of the electromagnetic field in a material medium, the use of this tensor being motivated both by historical analogies and direct variational procedure. By way of example we consider the exact solution of the extended Einstein-Maxwell model, describing the isotropic cosmological model with hidden non-vanishing electromagnetic field, electric polarization and magnetization.
description: 27 pages
WASP-104b is Darker than Charcoal
Creators: name: Močnik, T.
name: Hellier, C.
name: Southworth, J.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: By analysing the K2 short-cadence data from Campaign 14 we detect phase-curve modulation in the light curve of the hot-Jupiter host star WASP-104. The ellipsoidal modulation is detected with high significance and in agreement with theoretical expectations, while Doppler beaming and reflection modulations are detected tentatively. We show that the visual geometric albedo is lower than 0.03 at 95% confidence, making it one of the least-reflective planets found to date. The light curve also exhibits a rotational modulation, implying a stellar rotational period likely to be near 23 or 46 days. In addition, we refine the system parameters and place tight upper limits for transit timing and duration variations, starspot occultation events, and additional transiting planets.
description: 7 pages, 5 figures, 1 table. Accepted for publication in The Astronomical Journal
Boundary-adaptive kernel density estimation: the case of (near) uniform density
Creators: name: Racine, Jeffrey S.
name: Li, Qi
name: Wang, Qiaoyu
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Marine Biology
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Computational Biology

description: We consider nonparametric kernel estimation of density functions in the bounded-support setting having known support [a,b] using a boundary-adaptive kernel function and data-driven bandwidth selection, where a and b are finite and known prior to estimation. We observe, theoretically and in finite sample settings, that when bounds are known a priori this kernel approach is capable of outperforming even correctly specified parametric models, in the case of the uniform distribution. We demonstrate that this result has implications for modelling a range of densities other than the uniform case. Furthermore, when bounds [a,b] are unknown and the empirical support (i.e. [min(xi),max(xi)]) is used in their place, similar behaviour surfaces.
Scale anomalies in non-relativistic field theories in 2+1 dimensions
Creators: name: Haugset, T.
name: Ravndal, F.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: {}From the one-loop effective potential for a gas of non-relativistic bosons in two spatial dimensions interacting via a delta-function potential at zero-temperature and finite chemical potential, the anomaly of the energy-momentum tensor follows directly. It is also similarly derived when the bosons have an additional Chern-Simons interaction. In the special case of anyons, the scale anomaly vanishes to one-loop order in the effective potential and also to second order in the statistical angle.
description: 6, OSLO-TP 10-93
English-Catalan Neural Machine Translation in the Biomedical Domain through the cascade approach
Creators: name: Costa-jussà, Marta R.
name: Casas, Noe
name: Melero, Maite
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This paper describes the methodology followed to build a neural machine translation system in the biomedical domain for the English-Catalan language pair. This task can be considered a low-resourced task from the point of view of the domain and the language pair. To face this task, this paper reports experiments on a cascade pivot strategy through Spanish for the neural machine translation using the English-Spanish SCIELO and Spanish-Catalan El Periódico database. To test the final performance of the system, we have created a new test data set for English-Catalan in the biomedical domain which is freely available on request.
description: Full workshop proceedings can be found at https://multilingualbio.bsc.es/wp-content/uploads/2018/03/LREC-2018-PROCEEDINGS-MultilingualBIO.pdf
Effect of heavy-quark energy loss on the muon differential production cross section in Pb-Pb collisions at \sqrtsNN=5.5 TeV
Creators: name: del Valle, Z. Conesa
name: Dainese, A.
name: Ding, H. -T.
name: García, G. Martínez
name: Zhou, D. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the nuclear modification factors RAA and RCP of the high transverse momentum 5
Dust Polarization Toward Embedded Protostars in Ophiuchus with ALMA. I. VLA 1623
Creators: name: Sadavoy, Sarah I.
name: Myers, Philip C.
name: Stephens, Ian W.
name: Tobin, John
name: Commercon, Benoit
name: Henning, Thomas
name: Looney, Leslie
name: Kwon, Woojin
name: Segura-Cox, Dominique
name: Harris, Robert
Publisher: name: arXiv
Year: 2018
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present high resolution (~ 30 au) ALMA Band 6 dust polarization observations of VLA 1623. The VLA 1623 data resolve compact ~ 40 au inner disks around the two protobinary sources, VLA 1623-A and VLA 1623-B, and also an extended ~ 180 au ring of dust around VLA 1623-A. This dust ring was previously identified as a large disk in lower-resolution observations. We detect highly structured dust polarization toward the inner disks and the extended ring with typical polarization fractions ~ 1.7% and ~ 2.4%, respectively. The two components also show distinct polarization morphologies. The inner disks have uniform polarization angles aligned with their minor axes. This morphology is consistent with expectations from dust scattering. By contrast, the extended dust ring has an azimuthal polarization morphology not previously seen in lower-resolution observations. We find that our observations are well fit by a static, oblate spheroid model with a flux-frozen, poloidal magnetic field. We propose that the polarization traces magnetic grain alignment likely from flux freezing on large scales and magnetic diffusion on small scales. Alternatively, the azimuthal polarization may be attributed to grain alignment by the anisotropic radiation field. If the grains are radiatively aligned, then our observations indicate that large (~ 100 um) dust grains grow quickly at large angular extents. Finally, we identify significant proper motion of VLA 1623 using our observations and those in the literature. This result indicates that the proper motion of nearby systems must be corrected for when combining ALMA data from different epochs.
description: Accepted in ApJ; 15 pages, 13 figures
What's The Problem With ^3He?
Creators: name: Olive, Keith A.
name: Rood, Robert T.
name: Schramm, David N.
name: Truran, James
name: Vangioni-Flam, Elisabeth
Publisher: name: arXiv
Year: 1994
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the galactic evolutionary history of \he3 in models which deplete deuterium by as much as a factor of 2 to $\sim$ 15 from its primordial value to its present day observed value in the ISM. We show that when \he3 production in low mass stars (1 -- 3 $M_\odot$) is included over the history of the galaxy, \he3 is greatly over-produced and exceeds the inferred solar values and the abundances determined in galactic \hii regions. Furthermore, the ISM abundances show a disturbing dispersion which is difficult to understand from the point of view of standard chemical evolution models. In principle, resolution of the problem may lie in either 1) the calculated \he3 production in low mass stars; 2) the observations of the \he3 abundance; or 3) an observational bias towards regions of depleted \he3. Since \he3 observations in planetary nebula support the calculated \he3 production in low mass stars, option (1) is unlikely. We will argue for option (3) since the \he3 interstellar observations are indeed made in regions dominated by massive stars in which \he3 is destroyed. In conclusion, we note that the problem with \he3 seems to be galactic and not cosmological.
description: 17 pages, LaTeX, 5 postscript figures available upon request
Buffalo Bones in Profile
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 9999
Subjects: Unit Profile
Overview
Bison Bones
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of overview of unit profile displaying 500 year old bison bones. Original photograph scanned from slide.
Persistent homology based goodness-of-fit tests for spatial tessellations
Creators: name: Hirsch, Christian
name: Krebs, Johannes
name: Redenbach, Claudia
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Evolutionary Biology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Plant Biology

description: Motivated by the rapidly increasing relevance of virtual material design in the domain of materials science, it has become essential to assess whether topological properties of stochastic models for a spatial tessellation are in accordance with a given dataset. Recently, tools from topological data analysis such as the persistence diagram have allowed to reach profound insights in a variety of application contexts. In this work, we establish the asymptotic normality of a variety of test statistics derived from a tessellation-adapted refinement of the persistence diagram. Since in applications, it is common to work with tessellation data subject to interactions, we establish our main results for Voronoi and Laguerre tessellations whose generators form a Gibbs point process. We elucidate how these conceptual results can be used to derive goodness of fit tests, and then investigate their power in a simulation study. Finally, we apply our testing methodology to a tessellation describing real foam data.
A bootstrap functional central limit theorem for time-varying linear processes
Creators: name: Beering, Carina
name: Leucht, Anne
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Molecular Biology
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences

description: We provide a functional central limit theorem for a broad class of smooth functions for possibly non-causal multivariate linear processes with time-varying coefficients. Since the limiting processes depend on unknown quantities, we propose a local block bootstrap procedure to circumvent this inconvenience in practical applications. In particular, we prove bootstrap validity for a very large class of processes. Our results are illustrated by some numerical examples.
Duality in Quantum Toda theory and W-algebras
Creators: name: Kausch, H. G.
name: Watts, G. M. T.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider Quantum Toda theory associated to a general Lie algebra. We prove that the conserved quantities in both conformal and affine Toda theories exhibit duality interchanging the Dynkin diagram and its dual, and inverting the coupling constant. As an example we discuss the conformal Toda theories based on $B_2,B_3$ and $G_2$ and the related affine theories.
description: 25 pages
Localized modes of binary mixtures of Bose-Einstein condensates in nonlinear optical lattices
Creators: name: Abdullaev, F. Kh.
name: Gammal, A.
name: Salerno, M.
name: Tomio, Lauro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The properties of the localized states of a two component Bose-Einstein condensate confined in a nonlinear periodic potential [nonlinear optical lattice] are investigated. We reveal the existence of new types of solitons and study their stability by means of analytical and numerical approaches. The symmetry properties of the localized states with respect to the NOL are also investigated. We show that nonlinear optical lattices allow the existence of bright soliton modes with equal symmetry in both components, bright localized modes of mixed symmetry type, as well as, dark-bright bound states and bright modes on periodic backgrounds. In spite of the quasi 1D nature of the problem, the fundamental symmetric localized modes undergo a delocalizing transition when the strength of the nonlinear optical lattice is varied. This transition is associated with the existence of an unstable solution, which exhibits a shrinking (decaying) behavior for slightly overcritical (undercritical) variations in the number of atoms.
description: 13 pages, 14 figures
Isospin Conservation in Neutron Rich Systems of Heavy Nuclei
Creators: name: Jain, Ashok Kumar
name: Garg, Swati
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: It is generally believed that isospin would diminish in its importance as we go towards heavy mass region due to isospin mixing caused by the growing Coulomb forces. However, it was realized quite early that isospin could become an important and useful quantum number for all nuclei including heavy nuclei due to neutron richness of the systems~\cite{robson}. Lane and Soper~\cite{lane} also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations~\cite{jain,swati} for the fission fragment distributions obtained from heavy-ion fusion fission reactions. We discuss in detail the procedure adopted to assign the isospin values and the role of neutron multiplicity data in obtaining the total fission fragment distributions. We show that the observed fragment distributions can be reproduced rather reasonably well by the calculations based on the idea of conservation of isospin. This is probably the very first direct experimental evidence of the validity of isospin in heavy nuclei, which arises largely due to the neutron-rich nature of heavy nuclei and their fragments. This result may eventually become useful for the theories of nuclear fission and also in other practical applications.
description: 4 pages, 3 figures, Invited Talk at 16th International Symposium on Capture Gamma Ray Spectroscopy and Related Topics (CGS16), Shanghai Jiao Tong University, China and accepted in EPJ Web of Conferences
W_{\infty} Gauge Transformations and the Electromagnetic Interactions of Electrons in the Lowest Landau Level
Creators: name: Sakita, B.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We construct a $W_{\infty}$ gauge field theory of electrons in the lowest Landau level. For this purpose we introduce an external gauge potential $\cal A $ such that its $W_{\infty}$ gauge transformations cancel against the gauge transformation of the electron field. We then show that the electromagnetic interactions of electrons in the lowest Landau level are obtained through a non-linear realization of $\cal A$ in terms of the $U(1)$ gauge potential $A^{\m}$. As applications we derive the effective Lagrangians for circular droplets and for the $\n =1$ quantum Hall system.
description: 10 pages, CCNY-HEP-93/2 plain tex
Dependence of contrast and CNR on the IRF full-width at half-maximum (FWHM)
Creators: name: Mora, Alberto Dalla
Publisher: name: figshare
Year: 2018
Subjects: subject: 20599 Optical Physics not elsewhere classified
subject: FOS: Physical sciences

description: Each set of graphs shows the dependence of contrast (top row) and CNR (bottom row) on the depth or amount of optical perturbation of the inclusion (first and second column) and on the bulk optical properties (third column). In each single graph, the results for different source-detector distances (colors) are shown
TURLI TILLARIDA ANTROPONIMLRNING  LINGVOMADANIY  XUSUSIYATLARI (TURK VA TOJIK TILLARI MISOLIDA)
Creators: name: Kamolova, Sanobar
Publisher: name: Zenodo
Year: 2024

description: Ushbu mqolada  til va madaniyat, turkcha va tojikcha ismlar, ularning  lingvomadaniy  xususiyatlari  haqida bayon etilgan. Til madaniyat bilan yashaydi, madaniyat esa til bilan birga rivojlanadi va to‘planadi .Turk va tojik tillaridagi ism- fmiliyalarning o‘ziga xos qonunlar asosida ishlatilishi   ifodalangan. Hozirgi kunda   ijtimoiy-iqtisodiy, ijtimoiy-madaniy sharoitlar, oila tiplari, turmush tarzi, mentaliteti va boshqalar,bularning barchasi nomlarda ham o‘z ifodasini topgan.
The Swift/BAT AGN Spectroscopic Survey -- IX. The Clustering Environments of an Unbiased Sample of Local AGN
Creators: name: Powell, M. C.
name: Cappelluti, N.
name: Urry, C. M.
name: Koss, M.
name: Finoguenov, A.
name: Ricci, C.
name: Trakhtenbrot, B.
name: Allevato, V.
name: Ajello, M.
name: Oh, K.
name: Schawinski, K.
name: Secrest, N.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We characterize the environments of local accreting supermassive black holes by measuring the clustering of AGN in the Swift/BAT Spectroscopic Survey (BASS). With 548 AGN in the redshift range 0.01
description: Accepted for publication in ApJ
Phase diagram of nuclear "pasta" and its uncertainties in supernova cores
Creators: name: Sonoda, Hidetaka
name: Watanabe, Gentaro
name: Sato, Katsuhiko
name: Yasuoka, Kenji
name: Ebisuzaki, Toshikazu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the model dependence of the phase diagram of inhomogeneous nulcear matter in supernova cores using the quantum molecular dynamics (QMD). Inhomogeneous matter includes crystallized matter with nonspherical nuclei - "pasta" phases - and the liquid-gas phase separating nuclear matter. Major differences between the phase diagrams of the QMD models can be explained by the energy of pure neutron matter at low densities and the saturation density of asymmetric nuclear matter. We show the density dependence of the symmetry energy is also useful to understand uncertainties of the phase diagram. We point out that, for typical nuclear models, the mass fraction of the pasta phases in the later stage of the collapsing cores is higher than 10-20 %.
description: 11 pages, 5 figures
The reality conditions for the new canonical variables of General Relativity
Creators: name: Immirzi, Giorgio
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the constraints and the reality conditions that have to be imposed in the canonical theory of 4--d gravity formulated in terms of Ashtekar variables. We find that the polynomial reality conditions are consistent with the constraints, and make the theory equivalent to Einstein's, as long as the inverse metric is not degenerate; when it is degenerate, reality conditions cannot be consistently imposed in general, and the theory describes complex general relativity.
description: 11 p
Incorporating the effect of weather in construction scheduling and management with sine wave curves: application in the United Kingdom
Creators: name: Ballesteros-Pérez, Pablo
name: Smith, Stefán Thor
name: Lloyd-Papworth, Josephine Gwen
name: Cooke, Peter
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: The impact of (adverse) weather is a common cause of delays, legal claims and economic losses in construction projects. Research has recently been carried out aimed at incorporating the effect of weather in project planning; but these studies have focussed on either a narrow set of weather variables, or a very limited range of construction activities or projects. A method for processing a country’s historical weather data into a set of weather delay maps for some representative standard construction activities is proposed. Namely, sine curves are used to associate daily combinations of weather variables to delay and provide coefficients for expected productivity losses. A complete case study comprising the construction of these maps and the associated sine waves for the UK is presented along with an example of their use in building construction planning. Findings of this study indicate that UK weather extends project durations by an average of 21%. However, using climatological data derived from weather observations when planning could lead to average reductions in project durations of 16%, with proportional reductions in indirect and overhead costs.
Fermi pockets and quantum oscillations of the Hall coefficient in high temperature superconductors
Creators: name: Chakravarty, Sudip
name: Kee, Hae-Young
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent quantum oscillation measurements in high temperature superconductors in high magnetic fields and low temperatures have ushered in a new era. These experiments explore the normal state from which superconductivity arises and provide evidence of a reconstructed Fermi surface consisting of electron and hole pockets in a regime in which such a possibility was previously considered to be remote. More specifically, the Hall coefficient has been found to oscillate according to the Onsager quantization condition, involving only fundamental constants and the areas of the pockets, but with a sign that is negative. Here we explain the observations with the theory that the alleged normal state exhibits a hidden order, the $d$-density wave, which breaks symmetries signifying time reversal, translation by a lattice spacing, and a rotation by an angle $π/2$, while the product of any two symmetry operations is preserved. The success of our analysis underscores the importance of spontaneous breaking of symmetries, Fermi surface reconstruction, and conventional quasiparticles. We primarily focus on the version of the order that is commensurate with the underlying crystalline lattice, but also touch upon the consequences if the order were to incommensurate. It is shown that while commensurate order results in two independent oscillation frequencies as a function of the inverse of the applied magnetic field, incommensurate order leads to three independent frequencies. The oscillation amplitudes, however, are determined by the mobilities of the charge carriers comprising the Fermi pockets.
description: Final version with a correction of a minor typo; 6 pages, 2 figures
Slave Anyons in the $t$-$J$ Model at the Supersymmetric Point
Creators: name: Lerda, Alberto
name: Sciuto, Stefano
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We discuss the properties of the supersymmetric $t$-$J$ model in the formalism of the slave operators. In particular we introduce a generalized abelian bosonization for the model in two dimensions, and show that holons and spinons can be anyons of arbitrary complementary statistics (slave anyon representation). The braiding properties of these anyonic operators are thoroughly analyzed, and are used to provide an explicit linear realization of the superalgebra $SU(1|2)$. Finally, we prove that the Hamiltonian of the $t$-$J$ model in the slave anyon representation is invariant under $SU(1|2)$ for $J=2\,t$.
description: 37 pp., TeX file (3 figures on request), DFTT 30/93 and ITP-SB-93-30
Infrared modified gravity with propagating torsion: instability of torsionfull de Sitter-like solutions
Creators: name: Nikiforova, Vasilisa
name: Damour, Thibault
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We continue the exploration of the consistency of a modified-gravity theory that generalizes General Relativity by including a dynamical torsion in addition to the dynamical metric. The six-parameter theory we consider was found to be consistent around arbitrary torsionless Einstein backgrounds, in spite of its containing a (notoriously delicate) massive spin-2 excitation. At zero bare cosmological constant, this theory was found to admit a self-accelerating solution whose exponential expansion is sustained by a non-zero torsion background. The scalar-type perturbations of the latter torsionfull self-accelerating solution were recently studied and were found to preserve the number of propagating scalar degrees of freedom, but to exhibit, for some values of the torsion background some exponential instabilities (of a rather mild type). Here, we study the tensor-type and vector-type perturbations of the torsionfull self-accelerating solution, and of its deformation by a non-zero bare cosmological constant. We find strong, "gradient" instabilities in the vector sector. No tuning of the parameters of the theory can kill these instabilities without creating instabilities in the other sectors. Further work is needed to see whether generic torsionfull backgrounds are prone to containing gradient instabilities, or if the instabilities we found are mainly due to the (generalized) self-accelerating nature of the special de Sitter backgrounds we considered.
description: 32 pages, 2 figures; four references added in the Introduction; more explanations on the structure of the action of torsion gravity; additional discussion of the crossing between the two branches of de Sitter-like solutions; to be published in Phys. Rev. D
Resource theory of non-Gaussian operations
Creators: name: Zhuang, Quntao
name: Shor, Peter W.
name: Shapiro, Jeffrey H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Gaussian states and operations are crucial for various continuous-variable quantum information processing tasks. To quantitatively understand non-Gaussianity beyond states, we establish a resource theory for non-Gaussian operations. In our framework, we consider Gaussian operations as free operations, and non-Gaussian operations as resources. We define entanglement-assisted non-Gaussianity generating power and show that it is a monotone that is non-increasing under the set of free super-operations, i.e., concatenation and tensoring with Gaussian channels. For conditional unitary maps, this monotone can be analytically calculated. As examples, we show that the non-Gaussianity of ideal photon-number subtraction and photon-number addition equal the non-Gaussianity of the single-photon Fock state. Based on our non-Gaussianity monotone, we divide non-Gaussian operations into two classes: (1) the finite non-Gaussianity class, e.g., photon-number subtraction, photon-number addition and all Gaussian-dilatable non-Gaussian channels; and (2) the diverging non-Gaussianity class, e.g., the binary phase-shift channel and the Kerr nonlinearity. This classification also implies that not all non-Gaussian channels are exactly Gaussian-dilatable. Our resource theory enables a quantitative characterization and a first classification of non-Gaussian operations, paving the way towards the full understanding of non-Gaussianity.
description: 15 pages, 4 figures
Directional recoil rates for WIMP direct detection
Creators: name: Alenazi, Moqbil S.
name: Gondolo, Paolo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: New techniques for the laboratory direct detection of dark matter weakly interacting massive particles (WIMPs) are sensitive to the recoil direction of the struck nuclei. We compute and compare the directional recoil rates ${dR}/{d\cosθ}$ (where $θ$ is the angle measured from a reference direction in the sky) for several WIMP velocity distributions including the standard dark halo and anisotropic models such as Sikivie's late-infall halo model and logarithmic-ellipsoidal models. Since some detectors may be unable to distinguish the beginning of the recoil track from its end (lack of head-tail discrimination), we introduce a ``folded'' directional recoil rate ${dR}/{d|\cosθ|}$, where $|\cosθ|$ does not distinguish the head from the tail of the track. We compute the CS$_2$ and CF$_4$ exposures required to distinguish a signal from an isotropic background noise, and find that ${dR}/{d|\cosθ|}$ is effective for the standard dark halo and some but not all anisotropic models.
description: 39 pages, 15 figures
W-Infinity and String Theory
Creators: name: Shen, X.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review some recent developments in the theory of $W_\infty$. We comment on its relevance to lower-dimensional string theory.
description: 46 pages
Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
Creators: name: Lezama, A.
name: Valente, P.
name: Failache, H.
name: Martinelli, M.
name: Nussenzveig, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have numerically solved the Heisenberg-Langevin equations describing the propagation of quantized fields through an optically thick sample of atoms. Two orthogonal polarization components are considered for the field and the complete Zeeman sublevel structure of the atomic transition is taken into account. Quantum fluctuations of atomic operators are included through appropriate Langevin forces. We have considered an incident field in a linearly polarized coherent state (driving field) and vacuum in the perpendicular polarization and calculated the noise spectra of the amplitude and phase quadratures of the output field for two orthogonal polarizations. We analyze different configurations depending on the total angular momentum of the ground and excited atomic states. We examine the generation of squeezing for the driving field polarization component and vacuum squeezing of the orthogonal polarization. Entanglement of orthogonally polarized modes is predicted. Noise spectral features specific of (Zeeman) multi-level configurations are identified.
description: 12 pages 9 figures. Submitted to Physical Review A
From the library catalogue to the Semantic Web - The conversion process from MARC 21 to BIBFRAME 2.0
Creators: name: Geeraert, Friedel
name: Https://Orcid.Org/0000-0002-5780-2763
Publisher: name: figshare
Year: 2018
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: This study focuses on BIBFRAME from the perspective of metadata conversion from MARC 21 to BIBFRAME 2.0. In the first part (chapters 1-4) the following topics are discussed: the MARC format and AACR2, the linked data principles and the semantic web, FRBR and RDA and the BIBFRAME model. In the second part (chapters 5-6) a practical approach is taken to study the following researchquestion: ’What are the implications of the implementation of BIBFRAME on an organisational and operational level?’. The organisational implications of such a change are discussed based on a literature review centred around change (management) in libraries. The discussion about the operational implications is based on the analysis of the transformation of two sets of bibliographic descriptions inMARC XML stemming from two libraries: the National Library of Belgium or KBR and the university libraries of the Université Libre de Bruxelles. These records are transformed from MARC 21 into BIBFRAME 2.0 by means of the conversion tools made available by the Library of Congress. As the KBR uses an in-house version of MARC an additional transformation from KBR MARC to MARC 21 was necessary which was achieved by means of scripts programmed in Python.
Archaeological Monitoring at Lynwood Street, Phoenix, Maricopa County, Arizona
Creators: name: Touchin, Jewel
name: Stubing, Michael
Publisher: name: Jacobs
Year: 2011
Subjects: subject: Arizona (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/335/arizona-state-territory
subject: Phoenix, AZ
valueUri: https://core.tdar.org/browse/geographic-keyword/76695/phoenix-az
subject: Phoenix Basin
valueUri: https://core.tdar.org/browse/geographic-keyword/27/phoenix-basin
subject: Maricopa (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/3900/maricopa-county
subject: Hohokam
valueUri: https://core.tdar.org/browse/temporal-keyword/5633/hohokam
subject: Hohokam
valueUri: https://core.tdar.org/browse/culture-keyword/21/hohokam
subject: Resource Extraction / Production / Transportation Structure or Features
valueUri: https://core.tdar.org/browse/site-type/272/resource-extraction-production-transportation-structure-or-features
subject: Agricultural or Herding
valueUri: https://core.tdar.org/browse/site-type/273/agricultural-or-herding
subject: Canal or Canal Feature
valueUri: https://core.tdar.org/browse/site-type/275/canal-or-canal-feature
subject: Archaeological Monitoring
valueUri: https://core.tdar.org/browse/other-keyword/893/archaeological-monitoring
subject: Ground Disturbance Monitoring
valueUri: https://core.tdar.org/browse/investigation-type/20/ground-disturbance-monitoring
subject: Records Search / Inventory Checking
valueUri: https://core.tdar.org/browse/investigation-type/8/records-search-inventory-checking

description: Records in the PGM database indicate that the APE is located within 250 ft. of the archaeological site and within 50 ft. of a possible prehistoric canal. The COP Archaeology Office guidelines require that archaeological monitoring and/or testing be conducted for ground-disturbing projects that are located within 250 ft. of a prehistoric site or within 50 ft. of a prehistoric canal. Due to the possible presence of cultural resources, the COP Archaeology Office requested that cultural resource monitoring be conducted during ground-disturbing activities associated with this fence removal and concrete wall installation project. No evidence of the previously plotted prehistoric canal or any prehistoric or historic features or artifacts was identified within the area monitored.
Scattering From a Two Dimensional Array of Flux Tubes: A Study of The Validity of Mean Field Theory
Creators: name: Kiers, Ken
name: Weiss, Nathan
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Mean Field Theory has been extensively used in the study of systems of anyons in two spatial dimensions. In this paper we study the physical grounds for the validity of this approximation by considering the Quantum Mechanical scattering of a charged particle from a two dimensional array of magnetic flux tubes. The flux tubes are arranged on a regular lattice which is infinitely long in the ``$y$'' direction but which has a (small) finite number of columns in the ``$x$'' direction. Their physical size is assumed to be infinitesimally small. We develop a method for computing the scattering angle as well as the reflection and transmission coefficients to lowest order in the Aharonov--Bohm interaction. The results of our calculation are compared to the scattering of the same particle from a region of constant magnetic field whose magnitude is equal to the mean field of all the flux tubes. For an incident plane wave, the Mean Field approximation is shown to be valid provided the flux in each tube is much less than a single flux quantum. This is precisely the regime in which Mean Field Theory for anyons is expected to be valid. When the flux per tube becomes of order 1, Mean Field Theory is no longer valid.
description: 23 pages, University of British Columbia Preprint UBCTP93-010
Charge Symmetry Breaking Effects in Pion and Kaon Structure
Creators: name: Hutauruk, Parada T. P.
name: Bentz, Wolfgang
name: Cloët, Ian C.
name: Thomas, Anthony W.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Charge symmetry breaking (CSB) effects associated with the $u$ and $d$ quark mass difference are investigated in the quark distribution functions and spacelike electromagnetic form factors of the pion and kaon. We use a confining version of the Nambu--Jona-Lasinio model, where CSB effects at the infrared scale associated with the model are driven by the dressed $u$ and $d$ quark mass ratio, which because of dynamical chiral symmetry breaking is much closer to unity than the associated current quark mass ratio. The pion and kaon are given as bound states of a dressed quark and a dressed antiquark governed by the Bethe-Salpeter equation, and exhibit the properties of Goldstone bosons, with a pion mass difference given by $m_{π^+}^2 - m_{π^0}^2 \propto (m_u - m_d)^2$ as demanded by dynamical chiral symmetry breaking. We find significant CSB effects for realistic current quark mass ratios ($m_u/m_d \sim 0.5$) in the quark flavor-sector electromagnetic form factors of both the pion and kaon. For example, the difference between the $u$ and $d$ quark contributions to the $π^+$ electromagnetic form factors is about 8\% at a momentum transfer of $Q^2 \simeq 10\,$GeV$^2$, while the analogous effect for the light quark sector form factors in the $K^+$ and $K^0$ is about twice as large. For the Parton distribution functions, we find CSB effects which are considerably smaller than those found in the electromagnetic form factors.
description: 9 pages, 11 figures
title: Bassin du Ziz et du Rhéris. Hypsométrie et hydrographie
title: Bassin du Ziz et du Rhéris. Hypsométrie et hydrographie
Creators: name: :Unkn
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2023
Subjects: subject: Hydrographie
subject: Hypsométrie

description: Cartographie
description: BESM-carto_1955-66-p148-00_066-01
description: 148
description: 66
description: Bulletin économique et social du Maroc
description: Source: Maison méditerranéenne des sciences de l'homme, Cité numérique de la Méditerranée (Cinumed), Bibliothèque nationale du Royaume du Maroc (BNRM)
description: Source: Bulletin économique et social du Maroc
description: Source: Bulletin économique et social du Maroc (BESM) > BESM (Cartographie)
description: Relation: https://cinumed.mmsh.univ-aix.fr/idurl/1/81631
description: Coverage: Ziz
description: Coverage: Maroc
description: Coverage: XXe siècle
description: Temporal: XXe siècle
description: Bibliographic citation: « Bassin du Ziz et du Rhéris. Hypsométrie et hydrographie », In Bulletin économique et social du Maroc (BESM), n° 66, 1955
description: Provenance: Maison méditerranéenne des sciences de l'homme, Cité numérique de la Méditerranée (Cinumed), Bibliothèque nationale du Royaume du Maroc (BNRM)
description: Provenance: https://cinumed.mmsh.univ-aix.fr/
$Z_n$ Baxter Models and Quantum Symmetric Spaces
Creators: name: Freund, Peter G. O.
name: Zabrodin, Anton V.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The scattering of two excitations (both of the simplest kind) in the magnetic model related to the $Z_n$\--Baxter model is naturally described for $n \rightarrow \infty$ in terms of the Macdonald polynomials for root system $A_1$. These polynomials play the role of zonal spherical functions for a two parameter family of quantum symmetric spaces. These spaces ``interpolate'' between various $p$\--adic and real symmetric spaces.
description: 15 pages
de Sitter Relativity and Quantum Physics
Creators: name: Aldrovandi, R.
name: Almeida, J. P. Beltran
name: Mayor, C. S. O.
name: Pereira, J. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the presence of a cosmological constant, interpreted as a purely geometric entity, absence of matter is represented by a de Sitter spacetime. As a consequence, ordinary Poincare' special relativity is no longer valid and must be replaced by a de Sitter special relativity. By considering the kinematics of a spinless particle in a de Sitter spacetime, we study the geodesics of this spacetime, the ensuing definitions of canonical momenta, and explore possible implications for quantum mechanics.
description: To appear in "Quantum Theory: Reconsideration of Foundations 4", 11-16 June 2007, Vaxjo University, Sweden (AIP Conference Proceedings, ed. by G. Adenier, A. Khrennikov and T. Nieuwenhuizen). 10 pages