cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
La influencia de los eventos deportivos como motivación en la elección de un destino turístico y como motor de desarrollo del mismo
Creators: name: Blanco Gregory, Rocío
Publisher: name: Eracle. Journal of Sport and Social Sciences
Year: 2018

description: In this descriptive article, we present the development experienced in recent years of the tourism sector in Extremadura (Spain), focusing on tourism related to sport and adventure, classifying the different types of sports practiced in the autonomous community, how sport has
evolved in general over the years and, finally, the different companies dedicated to the conjugation of sporting events with tourism, which have boomed so much today. Sports tourism encompasses all activities that relate to sports in general. The main activities that can be highlighted are tourist trips to a specific destination that has been chosen, because important sporting events have been developed or the possibility of practicing sports in the same environment. The influence exercised by the media together with public institutions on the healthy aspects of sports, causes society to consider itself as another reason to travel to a certain destination and to experience what is publicized in these media. This entails an increase in the number of visitors to the destination in particular favoring, in turn, a remarkable development of economic, cultural and sports. The different business entities related to the tourism industry are using the great power of attraction of these sporting events, increasingly, as a strategy to promote a region or a country as tourist destinations.
description: Eracle. Journal of Sport and Social Sciences, Vol 1 (2018): Lo sport tra pratica quotidiana, appartenenze sociali e ricadute economiche
Remarks on the Generalized Chaplygin Gas
Creators: name: Banerjee, Rabin
name: Ghosh, Subir
name: Kulkarni, Shailesh
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We have developed an action formulation for the Generalized Chaplygin Gas (GCG). The most general form for the nonrelativistic GCG action is derived consistent with the equation of state. We have also discussed a relativistic formulation for GCG by providing a detailed analysis of the Poincare algebra.
description: References addeded
The SPIRou Legacy Survey: near-infrared and optical radial velocity analysis of Gl 480 and Gl 382 using SPIRou, HARPS and CARMENES spectrographs
Creators: name: Ould-Elhkim, M.
name: Moutou, C.
name: Donati, J-F.
name: Artigau, É.
name: Cadieux, C.
name: Martioli, E.
name: Forveille, T.
name: da Silva, J. Gomes
name: Cloutier, R.
name: Carmona, A.
name: Fouqué, P.
name: Charpentier, P.
name: Larue, P.
name: Cook, N. J.
name: Delfosse, X.
name: Doyon, R.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: Advancements in the field of exoplanetary research have extended radial velocity (RV) observations from the optical to the near-infrared (nIR) domain. M dwarf stars, characterized by their lower masses and higher prevalence of rocky planets, have become a focal point of investigation. This study uses data from the near-infrared spectropolarimeter SPIRou and data available in the literature from the HARPS and CARMENES spectrographs operating in the optical to analyze RVs of two nearby M dwarfs, Gl 480 and Gl 382.
 Aims: This work aims to detect and characterize exoplanetary companions around Gl 480 and Gl 382 by mitigating stellar activity effects through advanced data analysis techniques. The study seeks to improve the reliability of RV signals by integrating multi-wavelength observations and stellar activity diagnostics.
 Methods: The study employs a comprehensive approach that combines the line-by-line (LBL) framework with the Wapiti (Weighted principAl comPonent analysIs reconsTructIon) method to correct for systematics in SPIRou data. Through an extensive analysis of available stellar activity indicators and by combining optical data from the HARPS and CARMENES instruments, we perform a joint analysis of RV measurements in both the nIR and optical domains.
 Results: Our analysis confirms the detection of a planet orbiting Gl 480 with a period of $9.5537 \pm 0.0005$ d and a minimum mass of $8.8 \pm 0.7$ M$_\oplus$. Additionally, we detect a tentative signal at 6.4 d, whose significance depends strongly on the choice of Gaussian Process priors constrained by stellar activity indicators and would require further observations for confirmation. In contrast, no planetary signals are detected for Gl 382, where RV variations are dominated by stellar activity.
Wave functions for the Schwarschild black hole interior
Creators: name: Cartin, Daniel
name: Khanna, Gaurav
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the Hamiltonian constraint derived by Ashtekar and Bojowald, we look for pre-classical wave functions in the Schwarzschild interior. In particular, when solving this difference equation by separation of variables, an inequality is obtained relating the Immirzi parameter $γ$ to the quantum ambiguity $δ$ appearing in the model. This bound is violated when we use a natural value for $δ$ based on loop quantum gravity together with a recent proposal for $γ$. We also present numerical solutions of the constraint.
description: 15 pages, 4 figures, published version
The Bakken formation (late Devonian-early Mississippian) : a black shale source rock in the Williston Basin
Creators: name: Smith, Mark G.
Publisher: name: University of British Columbia
Year: 2009

description: The Bakken Formation (Late Devonian-Early Mississippian) is an entirely sub-surface deposit in the Williston Basin of Saskatchewan, Manitoba, North Dakota and Montana. It is composed of two black mudstone members (Lower and Upper), separated by a gray mudstone/sandstone member (Middle). The hemipelagic mudstone of the Lower and Upper members was deposited under stagnant bottom conditions, characterized by anoxic bottom water containing increased concentrations of dissolved H2S and sluggish bottom water currents, in water > 200 m deep. The Middle Member consists of a lower burrow-mottled offshore mudstone (Sub-unit A), a middle ripple-bedded and trough cross-bedded shoreface sandstone (Sub-unit B) and a second, upper burrow-mottled offshore mudstone (Sub-unit C). Abundant trace fossils in the Middle Member are characteristic of Nereites, Cruziana and Skolithos ichnofacies which reflect offshore and shoreface settings. Changes in depositional conditions reflected by Bakken members were caused by relative sea-level change. The Lower black mudstone was deposited during an increase in relative sea-level. The mudstone and sandstone of sub-units A and B (Middle Member) were deposited during a forced regression as relative sea-level rapidly dropped. The mudstone of Sub-unit C and the Upper Member were deposited during renewed sea-level rise. The Lower member contains up to 20% total organic carbon (TOC) because of high algal productivity and increased siliciclastic sedimentation which improved burial efficiency. The Upper black mudstone contains up to 35% TOC that resulted from high rates of algal productivity. Anoxic bottom water enhanced the concentration of organic matter by inhibiting substrate colonization that leads to sediment bioturbation. During Bakken deposition, estuarine-like circulation in the Williston Basin was caused by the semi-enclosed basin geography and prevailing east to west winds. Upwelling associated with estuarine-like circulation brought nutrientenriched water from the equatorial counter current in the adjacent Pacific Ocean Basin to the surface photic zone resulting in increased algal productivity. Restriction of estuarine-like circulation to the upper water column in a semienclosed Williston Basin could have isolated basin bottom water which, along with high rates of organic sedimentation, caused anoxia in bottom water. Deposition of organic-rich Bakken mudstones demonstrates the combined effects of increased productivity and enhanced preservation.
Rayleigh-Taylor turbulence is nothing like Kolmogorov turbulence in the self similar regime
Creators: name: Poujade, Olivier
Publisher: name: arXiv
Year: 2006
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Astrophysics (astro-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: An increasing number of numerical simulations and experiments describing the turbulent spectrum of Rayleigh-Taylor (RT) mixing layers came to light over the past few years. Results reported in recent studies allow to rule out a turbulence {\it à la Kolmogorov} as a mechanism acting on a self similar RT turbulent mixing layer. A different mechanism is presented, which complies with both numerical and experimental results and relates RT flow to other buoyant flows.
description: 4 pages, 1 figure, Phys. Rev. Lett 97, 185002 (2006)
Correcting Sky Quality Meter measurements for aging effects using twilight as calibrator
Creators: name: Puschnig, Johannes
name: Näslund, Magnus
name: Schwope, Axel
name: Wallner, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In the last decade numerous Sky Quality Meters (SQMs) were installed throughout the globe, aiming to assess the temporal change of the night sky brightness (NSB), and thus the change in light pollution. However, it has become clear that SQM readings may be affected by aging effects such as degradation of the sensor sensitivity and/or loss of transmissivity of optical components (filter, housing window). To date, the magnitude of the darkening has not been assessed in a systematic way. We report for the first time on the quantification of the SQM aging effect and describe the applied method. We combine long-term SQM measurements obtained between 2011 and 2019 in Potsdam-Babelsberg (23 km to the southwest of the center of Berlin), Vienna and Stockholm with a readily available empirical twilight model, which serves as calibrator. Twilight SQM observations, calibrated for changing sun altitudes, reveal a linear degradation of the measurement systems (SQM + housing window) with the following slopes: 34$\pm$4, 46$\pm$2 and 53$\pm$2 milli-mag$_{\rm SQM}$ arcsec$^{-2}$ yr$^{-1}$ for Stockholm, Potsdam-Babelsberg and Vienna. With the highest slope found in Vienna (latitude $\sim$48$^\circ$) and the lowest one found in Stockholm (latitude $\sim$59$^\circ$), we find an indication for the dependence of the trend on solar irradiance (which is a function of geographic latitude).
description: Submitted to MNRAS
An Update on the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007: Swift observations of UV variability and persistence of X-ray faintness
Creators: name: Grupe, Dirk
name: Schady, Patricia
name: Leighly, Karen M.
name: Komossa, Stefanie
name: O'Brien, Paul
name: Nousek, John A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the detection of UV variability and the persistence of X-ray faintness of the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007 based on the first year of monitoring this AGN with Swift between 2005 October and 2007 January. WPVS 007 has been an unusual source. While being X-ray bright during the ROSAT All-Sky Survey it has been extremely faint in all following X-ray observations. Swift also finds this NLS1 to be X-ray faint and not detected in the Swift X-Ray Telescope at an 3$σ$ upper limit of $2.6\times 10^{-17}$ W m$^{-2}$ in the 0.3-10.0 keV band and confirms that the AGN is still in a low state. During the 2006 July and December observations with \swift's UV-Optical Telescope (UVOT) the AGN became fainter by about 0.2 mag in the UV filters and by about 0.1 mag in V, B, and U compared with the 2005 October to 2006 January and 2006 September/October observations followed by a rebrightening in the 2007 January observation. This variability can be caused either by a change in the absorption column density and therefore the reddening in the UV, or by flux variations of the central engine. We also noticed that the flux in the UVOT filters agree with earlier measurements by the International Ultraviolet Explorer taken between 1993-1995, but spectra taken by the Hubble Space Telescope Faint Object Spectrograph show that WPVS 007 was fainter in the UV by a factor of at least 2 in 1996. The flat optical/UV spectrum suggests that some UV extinction is present in the spectrum, but that alone cannot at all account for the dramatic fading in the X-ray flux. Most likely we see a partial covering absorber in X-rays. Alternatively, the current X-ray emission seen from WPVS 007 may also be the emission from the host galaxy.
description: Accepted for publications in the Astronomical Journal, 14 pages, 5 figures, 4 tables
On the effects of the Chern-Simons term in an Abelian gauged Skyrme model in $d=4+1$ dimensions
Creators: name: Navarro-Lerida, Francisco
name: Radu, Eugen
name: Tchrakian, D. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study an Abelian gauged $O(5)$ Skyrme model in $4+1$ dimensions, featuring the $F^4$ Maxwell and the Chern-Simons terms. Our aim is to expose the mechanism, discovered in the analogous Abelian gauged $O(3)$ Skyrme model in $2+1$ dimensions, which leads to the unusual relation of the mass-energy $E$ to the electric charge $Q_e$ and angular momentum $J$, and, to the change in the value of the "baryon number" $q$ due to the influence of the Abelian field on the Skyrmion. Chern-Simons dynamics together with the dynamics of the gauged Skyrme scalar, allows for solutions with varying asymptotic values of the magnetic field, resulting in these unusual properties listed. Numerical work is carried out on an effective one dimensional subsystem resulting from imposition of an enhaced radial symmetry on ${\mathbb R}^4$.
description: 14 pages, 5 figures
Marco Bellinazzo (2017), I veri s ignori del calcio, Feltrinelli, Milano
Creators: name: Del Gaudio, Vincenzo
Publisher: name: Eracle. Journal of Sport and Social Sciences
Year: 2018

description: Un pensiero ideologico. 29 maggio 2015, un blitz dell’FBI mette a ferro e fuoco i vertici della Fifa. Il presidente che ha governato la massima istituzione calcistica mondiale dal 1904 si trova al centro di una funesta rete di ricatti, mazzette e gestione sleale del calcio. Il libro di Marco Bellinazzo, “I veri signori del calcio” (2017), si apre raccontando cosa accade in quei frenetici giorni di cambiamento.
description: Eracle. Journal of Sport and Social Sciences, Vol 1 (2018): Lo sport tra pratica quotidiana, appartenenze sociali e ricadute economiche
Fundamental Quantum Limit to Multiphoton Absorption Rate for Monochromatic Light
Creators: name: Tsang, Mankei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The local multiphoton absorption rate for an arbitrary quantum state of monochromatic light, taking into account the photon number, momentum, and polarization degrees of freedom, is shown to have an upper bound that can be reached by coherent fields. This surprising result rules out any quantum enhancement of the multiphoton absorption rate by momentum entanglement.
description: 4 pages, 1 figure, submitted, v2: accepted by PRL
Characterization of the footrot microbiome in Portuguese sheep breeds through metagenomics
Creators: name: Usié, Ana
Publisher: name: Zenodo
Year: 2022

description: Congress: Congreso Hispano-luso de Ganadería Extensiva y Desarrollo Rural. Sostenibilidad GarantizadaLocal: Cáceres (Spain). Date: 1-2 Nov. 2022
description: Introduction: In the Alentejo region Merino sheep are the most common breed, reared for the production of meat, dairy and wool. Footrot is responsible for lameness, decreased animal welfare and higher production losses, generating a negative economic impact. The disease is caused by the bacteria Dichelobacter nodosus that interacts with the sheep foot microbiome, to date largely uncharacterized. To understand and characterize the footrot microbiome dynamics,of different footrot affection scores, a whole metagenome sequencing (WMGS) approach was used.

Materials and methods: Tissue samples from affected feet were collected from 212 animals with different footrot degrees of lesion severity, ranging from 0 to 5. DNA was extracted from each sample and used in WMGS. The sequence dataset was analysed with a classic metagenomics approach to characterize and quantify the composition of the microbial community present in each sample. The reads of each sample were taxonomically classified and the abundance of each species identified was estimated in order to perform a differential abundance analysis between the samples with different footrot infection degrees.

Results and discussion: Distinct bacterial communities were associated with feet with different footrot scores identifying a total of 63 phyla and 504 families. As the severity of footrot infection increases the microorganisms’ diversity decreases triggering a shift in the composition of the microbiome from a dominant gram-positive in mild stages to a dominant gram-negative in the severe stages. The diminished diversity is accompanied by the increased abundances, as the disease progressed, of D. nodosus and Fusobacterium necrophorum (which plays a role as an opportunistic and is considered as a secondary pathogen), along with several species previously associated with footrot and other polymicrobial diseases affecting the epidermis and provoking inflammatory responses such as Treponema spp., Staphylococcus spp., Streptococcus spp. and Campylobacter spp. Although these bacteria are not able to initiate footrot, several evidences have been described supporting their association with the severity and incidence increase of footrot lesions caused by D. nodosus and F. necrophorum.

Conclusions: These results confirm the involvement of D. nodosus and F. necrophorum as two of the main species related with footrot infection. In this work were also identified a set of key-species that differentiate mild and severe footrot infection stages. Although further investigation is required to establish the roles of particular taxa, our results provided significant information to better understand diseases pathogenesis representing an important contribution for the analysis of the microbiome in animal welfare research.
Low-Power Reconfigurable FIR Filter HDL Design
Creators: name: Bagin, Richard
name: Nagy, Lukas
name: Stopjakova, Viera
Publisher: name: Zenodo
Year: 2025

description: This article discusses the process of HDL (hardware description language) design and testing of reconfigurable FIR filter optimized for low-power consumption in  nanoscale CMOS technology. The maximum number of coefficients and used numerical data representation can be set during synthesis. The end-user is then capable of changing the number of active coefficients (filter order) and their value. All flip-flops can be rearranged into 1-bit scan-chain for production test and it can also be used for filter debugging. MATLAB application was developed for easier interaction with the FIR filter. It allows to set the coefficients, process the samples, scan and display the contents of flip-flops.
Nuclear deformation as a source of the non-linearity of King plot in the Yb$^+$ ion
Creators: name: Allehabi, Saleh O.
name: Dzuba, V. A.
name: Flambaum, V. V.
name: Afanasjev, A. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We perform atomic relativistic many-body calculations of the field isotope shifts and calculations of corresponding nuclear parameters for all stable even-even isotopes of Yb$^+$ ion. We demonstrate that if we take nuclear parameters of the Yb isotopes from a range of the state-the-art nuclear models which all predict strong quadrupole nuclear deformation, then calculated non-linearity of the King plot, caused by the difference in the deformation in different isotopes, is consistent with the non-linearity observed in the experiment (Ian Counts {\em et al}, Phys. Rev. Lett. {\bf 125}, 123002 (2020)). The changes of nuclear RMS radius between isotopes extracted from experiment are consistent with those obtained in the nuclear calculations.
description: 6 pages, 1 figure
Giant persistent photoconductivity in monolayer MoS2 field-effect transistors
Creators: name: George, A.
name: Fistul, M. V.
name: Gruenewald, M.
name: Kaiser, D.
name: Lehnert, T.
name: Mupparapu, R.
name: Neumann, C.
name: Hübner, U.
name: Schaal, M.
name: Masurkar, N.
name: Reddy, A. L. M.
name: Staude, I.
name: Kaiser, U.
name: Fritz, T.
name: Turchanin, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Monolayer transition metal dichalcogenides (TMD) have numerous potential applications in ultrathin electronics and photonics. The exposure of TMD based devices to light generates photo-carriers resulting in an enhanced conductivity, which can be effectively used, e.g., in photodetectors. If the photo-enhanced conductivity persists after removal of the irradiation, the effect is known as persistent photoconductivity (PPC). Here we show that ultraviolet light (wavelength = 365 nm) exposure induces an extremely long-living giant PPC (GPPC) in monolayer MoS2 (ML-MoS2) field-effect transistors (FET) with a time constant of ~30 days. Furthermore, this effect leads to a large enhancement of the conductivity up to a factor of 107. In contrast to previous studies in which the origin of the PPC was attributed to extrinsic reasons such as trapped charges in the substrate or adsorbates, we unambiguously show that the GPPC arises mainly from the intrinsic properties of ML-MoS2 such as lattice defects that induce a large amount of localized states in the forbidden gap. This finding is supported by a detailed experimental and theoretical study of the electric transport in TMD based FETs as well as by characterization of ML-MoS2 with scanning tunneling spectroscopy, high-resolution transmission electron microscopy, and photoluminescence measurements. The obtained results provide a basis towards the defect-based engineering of the electronic and optical properties of TMDs for device applications.
description: 25 pages, 5 figures
Electricity and Water Supply Consumption and Green House Gas Emission at the Office of the Faculty of Science and Technology, Suan Sunandha Rajabhat University
Creators: name: Ronbanchob Apiratikul
Publisher: name: Podduang Enterprise Co., Ltd
Year: 2015
Subjects: Resources management, Electricity, Water supply, Green House Gases Emission

description: 2, 2, Suan Sunandha Science and Technology Journal
Electrical detection of magnetic circular dichroism: application to magnetic microscopy in ultra-thin ferromagnetic films
Creators: name: Guillet, T.
name: Marty, A.
name: Vergnaud, C.
name: Bonell, F.
name: Jamet, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Imaging the magnetic configuration of thin-films has been a long-standing area of research. Since a few years, the emergence of two-dimensional ferromagnetic materials calls for innovation in the field of magnetic imaging. As the magnetic moments are extremely small, standard techniques like SQUID, torque magnetometry, magnetic force microscopy and Kerr effect microscopy are challenging and often lead to the detection of parasitic magnetic contributions or spurious effects. In this work, we report a new magnetic microscopy technique based on the combination of magnetic circular dichroism and Seebeck effect in semiconductor/ferromagnet bilayers. We implement this method with perpendicularly magnetized (Co/Pt) multilayers sputtered on Ge (111). We further show that the electrical detection of MCD is more sensitive than the Kerr magnetometry, especially in the ultra-thin film regime, which makes it particularly promising for the study of emergent two-dimensional ferromagnetic materials.
description: 8 pages, 10 figures
Quasi-long-range ordering in a finite-size 2D Heisenberg model
Creators: name: Kapikranian, Oleksandr
name: Berche, Bertrand
name: Holovatch, Yurij
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We analyse the low-temperature behaviour of the Heisenberg model on a two-dimensional lattice of finite size. Presence of a residual magnetisation in a finite-size system enables us to use the spin wave approximation, which is known to give reliable results for the XY model at low temperatures T. For the system considered, we find that the spin-spin correlation function decays as 1/r^eta(T) for large separations r bringing about presence of a quasi-long-range ordering. We give analytic estimates for the exponent eta(T) in different regimes and support our findings by Monte Carlo simulations of the model on lattices of different sizes at different temperatures.
description: 9 pages, 3 postscript figs, style files included
A photo-induced strange metal with electron and hole quasi-particles
Creators: name: Dasari, Nagamalleswararao
name: Li, Jiajun
name: Werner, Philipp
name: Eckstein, Martin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Photo-doping of Mott insulators or correlated metals can create an unusual metallic state which simultaneously hosts hole-like and electron-like particles. We study the dynamics of this state up to long times, as it passes its kinetic energy to the environment. When the system cools down, it crosses over from a bad metal into a resilient quasiparticle regime, in which quasiparticle bands are formed with separate Fermi levels for electrons and holes, but quasiparticles do not yet satisfy the Fermi liquid paradigm. Subsequently, the transfer of energy to the environment slows down significantly, and the system does not reach the Fermi liquid state even on the timescale of picoseconds. The transient photo-doped strange metal exhibits unusual properties of relevance for ultrafast charge and heat transport: In particular, there can be an asymmetry in the properties of electrons and holes, and strong correlations between electrons and holes, as seen in the spectral properties.
description: 7 pages, 6 figures
Quantum Hall Effect of Dirac Fermions in Graphene: Disorder Effect and Phase Diagram
Creators: name: Sheng, D. N.
name: Sheng, L.
name: Weng, Z. Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We numerically study the interplay of band structure, topological invariant and disorder effect in two-dimensional electron system of graphene in a magnetic field. Two \emph{distinct} quantum Hall effect (QHE) regimes exist in the energy band with the unconventional "half-integer" QHE appearing near the band center, consistent with the experimental observation. The latter is more robust against disorder scattering than the conventional QHE states near the band edges. The phase diagram for the unconventional QHE is obtained where the destruction of the Hall plateaus at strong disorder is through the float-up of extended levels toward band center and higher plateaus always disappear first. We further predict a new insulating phase between $ν=\pm 2$ QHE states at the band center, which may explain the experimentally observed resistance discontinuity near zero gate voltage.
description: 4 pages, 4 figures
Singular Modes of the Electromagnetic Field
Creators: name: Budko, Neil V.
name: Samokhin, Alexander B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We show that the mode corresponding to the point of essential spectrum of the electromagnetic scattering operator is a vector-valued distribution representing the square root of the three-dimensional Dirac's delta function. An explicit expression for this singular mode in terms of the Weyl sequence is provided and analyzed. An essential resonance thus leads to a perfect localization (confinement) of the electromagnetic field, which in practice, however, may result in complete absorption.
description: 14 pages, no figures
The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135
Creators: name: Readhead, A. C. S.
name: Ravi, V.
name: Liodakis, I.
name: Lister, M. L.
name: Singh, V.
name: Aller, M. F.
name: Blandford, R. D.
name: Browne, I. W. A.
name: Gorjian, V.
name: Grainge, K. J. B.
name: Gurwell, M. A.
name: Hodges, M. W.
name: Hovatta, T.
name: Kiehlmann, S.
name: Lähteenmäki, A.
name: McAloone, T.
name: Max-Moerbeck, W.
name: Pavlidou, V.
name: Pearson, T. J.
name: Peirson, A. L.
name: Perlman, E. S.
name: Reeves, R. A.
name: Soifer, B. T.
name: Taylor, G. B.
name: Tornikoski, M.
name: Vedantham, H. K.
name: Werner, M.
name: Wilkinson, P. N.
name: Zensus, J. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: PKS 1413+135 is one of the most peculiar blazars known. Its strange properties led to the hypothesis almost four decades ago that it is gravitationally lensed by a mass concentration associated with an intervening galaxy. It exhibits symmetric achromatic variability, a rare form of variability that has been attributed to gravitational milli-lensing. It has been classified as a BL Lac object, and is one of the rare objects in this class with a visible counterjet. BL Lac objects have jet axes aligned close to the line of sight. It has also been classified as a compact symmetric object, which have jet axes not aligned close to the line of sight. Intensive efforts to understand this blazar have hitherto failed to resolve even the questions of the orientation of the relativistic jet, and the host galaxy. Answering these two questions is important as they challenge our understanding of jets in active galactic nuclei and the classification schemes we use to describe them. We show that the jet axis is aligned close to the line of sight and PKS 1413+135 is almost certainly not located in the apparent host galaxy, but is a background object in the redshift range $0.247 < z < 0.5$. The intervening spiral galaxy at $z = 0.247$ provides a natural host for the putative lens responsible for symmetric achromatic variability and is shown to be a Seyfert 2 galaxy. We also show that, as for the radio emission, a "multizone" model is needed to account for the high-energy emission.
description: Accepted for publication in The Astrophysical Journal. 28 pages, 15 figures
Probing the role of single defects on the thermodynamics of electric-field induced phase transitions
Creators: name: Kalinin, S. V.
name: Jesse, S.
name: Rodriguez, B. J.
name: Chu, Y. H.
name: Ramesh, R.
name: Eliseev, E. A.
name: Morozovska, A. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The kinetics and thermodynamics of first order transitions is universally controlled by defects that act as nucleation sites and pinning centers. Here we demonstrate that defect-domain interactions during polarization reversal processes in ferroelectric materials result in a pronounced fine structure in electromechanical hysteresis loops. Spatially-resolved imaging of a single defect center in multiferroic BiFeO3 thin film is achieved, and the defect size and built-in field are determined self-consistently from the single-point spectroscopic measurements and spatially-resolved images. This methodology is universal and can be applied to other reversible bias-induced transitions including electrochemical reactions.
description: 34 pages,4 figures, high quality figures are available upon request, submitted to Phys. Rev. Lett
Envisioning the Future of DDI in the Metadata Landscape
Creators: name: Orten, Hilde
name: Johnson, Jon
name: Lyle, Jared
Publisher: name: Zenodo
Year: 2023
Subjects: DDI
metadata

description: This European DDI (EDDI) User Conference plenary session was for the chairs of the DDI Executive Board and the DDI Scientific Board, as well as the DDI Executive Director, to discuss Alliance priorities and plans, especially with an eye toward user and member needs. Presenters and attendees engaged in conversations and Q&A, especially to envision DDI's strategic role in the exciting future of metadata.

A separate PDF file captured attendees' feedback provided to the following questions:

What are some of the things that you were really pleased or excited about with DDI in 2023?

What challenges are you or your organization currently facing that you need DDI products and/or services to solve?

What are important focus points for the scientific and technical work of the DDI Alliance in the next two years?

What DDI training opportunities would you like to see in the next year?
Simulating Yang-Mills theories with a complex coupling
Creators: name: Pawlowski, Jan M.
name: Scherzer, Manuel
name: Schmidt, Christian
name: Ziegler, Felix P. G.
name: Ziesché, Felix
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a novel simulation strategy for Yang-Mills theories with a complex coupling, based on the Lefschetz thimble decomposition. We envisage, that the approach developed in the present work, can also be adapted to QCD at finite density, and real time simulations. Simulations with Lefschetz thimbles offer a potential solution to sign problems in Monte Carlo calculations within many different models with complex actions. We discuss the structure of Generalized Lefschetz thimbles for pure Yang-Mills theories with a complex gauge coupling $β$ and show how to incorporate the gauge orbits. We propose to simulate such theories on the union of the tangential manifolds to the relevant Lefschetz thimbles attached to the critical manifolds of the Yang-Mills action. We demonstrate our algorithm on a (1+1)-dimensional U(1) model and discuss how, starting from the main thimble result, successive subleading thimbles can be taken into account via a reweighting approach. While we face a residual sign problem, our novel approach performs exponentially better than the standard reweighting approach.
description: 18 pages, 10 figures
Stability of trapped fermionic gases with attractive interactions
Creators: name: Fregoso, Benjamin M.
name: Baym, Gordon
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a unified overview, from the mean-field to the unitarity regime, of the stability of a trapped Fermi gas with short range attractive interactions. Unlike in a system of bosons, a Fermi gas is always stable in these regimes, no matter how large the particle number. However, when the interparticle spacing becomes comparable to the range of the interatomic interactions, instability is not precluded.
description: 5 pages, 4 figures
Recursive Diagonalization of Quantum Hamiltonians to all order in $\hbar$
Creators: name: Gosselin, Pierre
name: Hanssen, Jocelyn
name: Mohrbach, Herve
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a diagonalization method for generic matrix valued Hamiltonians based on a formal expansion in power of $\hbar $. Considering $\hbar $ as a running parameter, a differential equation connecting two diagonalization processes for two very close values of $\hbar $ is derived. The integration of this differential equation allows the recursive determination of the series expansion in powers of $\hbar $ for the diagonalized Hamiltonian. This approach results in effective Hamiltonians with Berry phase corrections of higher order in $\hbar $, and deepens previous works on the semiclassical diagonalization of quantum Hamiltonians which led notably to the discovery of the intrinsic spin Hall effect. As physical applications we consider spinning massless particles in isotropic inhomogeneous media and show that both the energy and the velocity get quantum corrections of order $\hbar ^{2}$. We also derive formally to all order in $\hbar $ the energy spectrum and the equations of motion of Bloch electrons in an external electric field.
Unified description of charge and spin excitations of stripes in cuprates
Creators: name: Lorenzana, J.
name: Seibold, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study stripes in cuprates within the one-band and the three-band Hubbard model. Magnetic and charge excitations are described within the time-dependent Gutzwiller approximation. A variety of experiments (charge profile from resonant soft X-ray scattering, incommensurability vs. doping, optical excitations, magnetic excitations, etc.) are described within the same approach.
description: 4 pages, 4 figures, submitted to M2S-HTSC VIII, Dresden 2006
A possible explanation of a broad $1^{--}$ resonant structure around 1.5GeV
Creators: name: Li, Bing An
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The broad $1^{--}$ resonant structure around 1.5GeV observed in the $K^+ K^-$ mass spectrum in $J/ψ\to K^+ K^-π^0$ by BESII is interpreted as a composition of $ρ(1450)$ and $ρ(1700)$. Various tests are investigated.
description: 9 pages
Geology, alteration, mineralization and metal zonation of the Mt. Milligan porphyry copper-gold deposits
Creators: name: Delong, R. Campbell
Publisher: name: University of British Columbia
Year: 2009

description: The Mt. Milligan porphyry copper-gold deposits are in central British Columbia, 155 km northwest of Prince George. They were discovered in 1987 after extensive soil and lithogeochemical sampling, geological mapping, ground and airborne geophysical surveys, trenching and diamond drilling. An indicated resource of 299 million tonnes grading 0.45 g/t Au and 0.22% Cu has been delineated in two deposits: Mt. Milligan Main, which includes the 66 zone, and the Southern Star. The Mt. Milligan deposits are hosted by porphyritic monzonite stocks and adjacent volcanic rocks of the Witch Lake formation of the Takla Group. All are within the Early Mesozoic Quesnel Terrane. Potassic and propylitic alteration characterize the Mt. Milligan deposits. Potassic alteration is most intensely developed around the contacts of the MBX and Southern Star stocks. An inner biotite subzone is spatially related to the core of copper-gold mineralization. Propylitic alteration occurs peripheral to, and locally superimposed on, the outer borders of the potassic alteration. Central parts of most of the deposits are: (i) gold and copper rich, (ii) mineralized with chalcopyrite, and minor bornite and pyrite, and (iii) associated with potassic alteration. Peripheral mineralization, including the gold rich but copper poor 66 zone, is marked by minor lead-zinc-silver mineralization (mainly in sparse veins) associated with propylitic alteration. Higher gold concentrations in the 66 zone can be accounted for by overprinting of two periods of gold deposition from AuCl⁻¹ and Au(HS)₂⁻ bearing solutions. Other characteristics consistent with this two stage model of gold deposition are: (1) two populations of gold, one correlating with copper (gold transport as AuCl⁻¹ similar to the higher temperature copper chloride complexes), and one independent of copper (transport as Au(HS) ₂⁻), (2) two periods of alteration: (i) potassic (consistent with gold being transported as AuCl⁻¹), and (ii) a propylitic retrograde overprint of an assemblage of epidote-pyrite associated with alteration of biotite to chlorite, and (3) elevated zinc, lead and silver concentrations, indicative of lower temperature solutions that would favour gold transport as Au(HS) ₂⁻.
Nonlinearity Compensation and Link Margin Analysis of 112-Gbps Circular-Polarization Division Multiplexed Fiber Optic Communication System using a Digital Coherent Receiver over 800-km SSMF Link
Creators: name: Choyon, A. K. M. Sharoar Jahan
name: Chowdhury, Ruhin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Nonlinear effects have been considered as the major limitations in coherent optical (CO) fiber transmission system. DSP based CO receiver with digital backpropagation (DBP) method has recently facilitated the compensation of fiber nonlinear impairments as well as compensating dispersion of optical fiber. In this paper, a comprehensive design is presented for circular-polarization division multiplexed (CPDM) 8-quadrature amplitude modulation (8-QAM) with DSP based CO receiver for the fiber optic communication (FOC) system to investigate the impact of nonlinearities. We have examined the performance of nonlinearity compensating DSP based CO receiver with DBP method and demonstrated that it can be effectively employed to mitigate the intrachannel nonlinearities in CPDM 8-QAM FOC system over 800-km SSMF link. By effectively compensating the fiber nonlinearities, we analyze the performance of bit error rate (BER), optical signal to noise ratio (OSNR), optimum launch power, and investigate the link margin by evaluating OSNR margin for a specific launch power. Moreover, a CPDM technique helps as a very suitable means of maximizing the link capacity as well as enhancing the spectral-efficiency (SE) of the FOC system.
description: 11 pages, 12 figures
ERICC Working Paper _ Diversity and Fragmentation of Myanmar Education: Schooling Shaped by Protracted Conflict and Crisis
Creators: name: ERICC Consortium
name: Rinehart, Gray
name: Pherali, Tejendra
name: Chase, Elaine
name: Zaw, Htet Thiha
name: Naing, Thein
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: This rigorous review synthesises evidence on education in the conflict-affected contexts of Myanmar. Applying the ERICC conceptual framework (Kim et al., 2022), we analyse the status of education and overall outcomes in terms of access, quality, continuity and coherence of education, particularly in regions that are controlled by ethnic armed organisations (EAOs), in refugee camps and in migrant settings on the Thai-Myanmar border. 114 studies were coded against the ERICC conceptual framework to prioritise key themes at policy systems and local levels. The study found that grievances among the ethnic minority communities because of the exclusionary and hegemonic education policies adopted by the central government have contributed to the formations of diverse ethnic educational provisions that assert autonomy and serve as a vehicle for political resistance. Nevertheless, there is a significant gap in knowledge about the quality of these provisions and the extent to which they promote equity, justice and social cohesion. The 2021 coup has significantly affected all education systems in Myanmar, leading to an acute schooling and learning crisis for millions of children. Most ethnic education systems remain at risk of attack while many are regularly experiencing disruptions due to ongoing clashes between EAOs and the Myanmar military in their regions. Even though some EAOs and ethnic minority communities have historically campaigned for a federal democratic political settlement, there is evidence of ambivalence among key ethnic stakeholders with regards to the Federal Democracy Education Policy proposed by the National Unity Government. Thailand’s restrictive policies towards refugees limits the opportunities open to refugee youth and prohibits them from seeking employment educational opportunities outside the nine refugee camps on the border. This lack of future prospects undermines refugee children’s motivation to continue education. Even though the education in refugee camps is managed by refugee organisations, their reliance on limited and precarious donor funding means that the sustainability and overall quality of the provisions are perpetually at risk. The migrant educational provisions operate within a ‘zone of exception,’ meaning they are generally tolerated by the Thai state but do not receive any governmental support. As a result, migrant learning centres largely operate with external funding. This study highlights serious gaps in education research and calls for policy-relevant and actionable research evidence that could inform educational decision-making in the conflict-affected contexts of Myanmar.