cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Designer Flat Bands: Topology and Enhancement of Superconductivity
Creators: name: Chan, Si Min
name: Grémaud, B.
name: Batrouni, G. G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We construct quasi one-dimensional topological and non-topological three-band lattices with tunable band gap and winding number of the flat band. Using mean field (MF) and exact density matrix renormalization group (DMRG) calculations, we show explicitly how the band gap affects pairing and superconductivity (SC) in a Hubbard model with attractive interactions. We show excellent agreement between MF and DMRG. When a phase twist is applied on the system, a phase difference appears between pairing order parameters on different sublattices, and this plays a very important role in the SC density. The SC weight, $D_s$, on the gapped topological, $W\neq0$, flat band increases linearly with interaction strength, $U$, for low values, and with a slope that depends on the details of the compact localized state at $U=0$. As $U\to 0$ for the gapped non-topological flat band ($W=0$), $D_s$ decays with a power law faster than quadratic but slower than exponential. This indicates that isolated non-topological flat bands are less beneficial to SC. In the gapless case (flat band touching the band above it), we find at low $U$ (both for $W=0$ and $W\neq 0$) that $D_s\propto U^φ$ with $φ<1$ contrary to the $U{\rm ln}\, ({\rm const.}/U)$ behavior reported in the literature. In other words, $D_s$ increases faster than linearly for low $U$ thus favoring SC at weak interaction more than the gapped case. For systems with touching bands, we observe that the one-body correlation length, $ξ$, diverges as a power law as $U\rightarrow0$, while for the isolated flat band $ξ(U\to 0)$ is a constant smaller than one lattice spacing. Both behaviors are distinct from the exponential divergence of $ξ$ in the dispersive case. Our results re-establish that the BCS mean field and quantum metric alone are insufficient to characterize SC at weak coupling.
title: Crambamboli-Lied; [1848]
title: Wie prächtig geht's im deutschen Land Wohl mit der Märzerrungenschaft! ...
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform des Erscheinungsvermerks: Gedruckt und zu haben bei August Stritt in Frankfurt a. M., Rosengasse No. 3
Temperature dependent resistivity in the doped two dimensional metallic phase of mTMD bilayers
Creators: name: Ahn, Seongjin
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two recent experiments from Cornell and Columbia have reported insulator-to-metal transitions in two-dimensional (2D) moiré transition metal dichalcogenides (mTMD) induced by doping around half-filling, where the system is a Mott insulator. In the current work, we consider the temperature dependent resistivity of this metallic phase in the doped situation away from half-filling, arguing that it arises from the strongly temperature dependent 2D Friedel oscillations (i.e. finite momentum screening) associated with random quenched charged impurities, leading to the observed strongly increasing linear-in-$T$ resistivity in the metallic phase. Our theory appears to account for the temperature-dependent metallic resistivity for doping around half-filling of the effective moiré TMD band, showing that temperature-dependent screened Coulomb disorder is an essential ingredient of doped 2D mTMD physics.
description: 5 pages, 3 figures
Generalized Browder's theorem for tensor product and elementary operators
Creators: name: Boasso, Enrico
name: Duggal, B. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A10

description: The transfer property for the generalized Browder's theorem both of the tensor product and of the left-right multiplication operator will be characterized in terms of the $B$-Weyl spectrum inclusion. In addition, the isolated points of these two classes of operators will be fully characterized.
description: 11 pages; original research article
Breaking wave field statistics with a multilayer model
Creators: name: Wu, Jiarong
name: Popinet, Stéphane
name: Deike, Luc
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The statistics of breaking wave fields is characterised within a novel multi-layer framework, which generalises the single-layer Saint-Venant system into a multi-layer and non-hydrostatic formulation of the Navier-Stokes equations. We simulate an ensemble of phase-resolved surface wave fields in physical space, where strong non-linearities including wave breaking are modelled, without surface overturning. We extract the kinematics of wave breaking by identifying breaking fronts and their speed, for freely evolving wave fields initialised with typical wind wave spectra. The $Λ(c)$ distribution, defined as the length of breaking fronts (per unit area) moving with speed $c$ to $c+dc$ following Phillips 1985, is reported for a broad range of conditions. We recover the $Λ(c) \propto c^{-6}$ scaling without any explicit wind forcing for steep enough wave fields. A scaling of $Λ(c)$ based solely on the mean square slope and peak wave phase speed is shown to describe the modelled breaking distributions well. The modelled breaking distributions are found to be in good agreement with field measurements and the proposed scaling is consistent with previous empirical formulations. The present work paves the way for simulations of the turbulent upper ocean directly coupled with realistic breaking waves dynamics, including Langmuir turbulence, and other sub-mesoscale processes.
description: first submission
Hadronic resonances in heavy-ion collisions at ALICE (Strangeness in Quark Matter 2013)
Creators: name: Knospe, A. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Properties of the hadronic phase of high-energy heavy-ion collisions can be studied by measuring the ratios of hadronic resonance yields to the yields of longer-lived particles. These ratios can be used to study the strength of re-scattering effects, the chemical freeze-out temperature, and the lifetime between chemical and kinetic freeze-out. The restoration of chiral symmetry during the early hadronic phase or near the phase transition may lead to shifts in the masses and increases in the widths of hadronic resonances. The ALICE collaboration has measured the spectra, masses, and widths of the K*(892)0 and phi(1020) resonances in Pb-Pb collisions at 2.76 TeV. These results, including RAA and the ratios of the integrated resonance yields to stable hadron yields, are presented and compared to results from other collision systems and to theoretical predictions.
description: 4 pages, 3 figures, Proceedings of Strangeness in Quark Matter conference, 21-27 July 2013, Birmingham, UK
title: Der Präsident der verfassunggebenden Reichsversammlung verfehlt nicht ... mitzutheilen, daß der Reichstags-Abgeordnete Wiebker von Uckermünde ... gestorben ist und Morgen ... zu Grabe getragen wird,; [1849]
title: Frankfurt am Main, den 28. März 1849
titleType: Subtitle
Creators: name: Simson, Eduard ¬von
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Ohne Titel. - In Fraktur
Numerical simulations of seismo-acoustic nuisance patterns from an induced M1.8 earthquake in the Helsinki, southern Finland, metropolitan area
Creators: name: Krenz, Lukas
name: Wolf, Sebastian
name: Hillers, Gregor
name: Gabriel, Alice-Agnes
name: Bader, Michael
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geophysics (physics.geo-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Seismic waves can couple with the atmosphere and generate sound waves. The influence of faulting mechanisms on earthquake sound patterns provides opportunities for earthquake source characterization. Sound radiated from earthquakes can be perceived as disturbing which can negatively impact the social acceptance of geoengineering applications. Motivated by reports of felt and heard disturbances associated with the week-long stimulation of a 6 km-deep geothermal system in 2018 below the Otaniemi district of Espoo, Helsinki, we conduct fully coupled 3D numerical simulations of wave propagation in the solid Earth and the atmosphere. We assess the sensitivity of the ground shaking and audible noise distributions to the source geometry of the induced earthquakes. Utilizing recent computational advances and the open-source software SeisSol, we model seismo-acoustic frequencies up to 25 Hz, thereby reaching the lower limit of the audible sound frequency range. We present synthetic distributions of shaking and audible and discuss implications for better understanding seismic nuisances in metropolitan regions. In five 3D coupled elastic-acoustic scenario, we analyze the ground velocity and pressure levels of earthquake-generated seismic and acoustic waves. We show that S waves generate the strongest sound disturbance with sound pressure levels of up to 0.04 Pa. We use statistical analysis to compare our noise distributions with commonly used empirical relationships. We find that our 3D synthetic amplitudes are generally smaller than the empirical predictions and that the interaction of the source-specific radiation pattern and topography can lead to significant non-linear effects. Our study highlights the complexity and information content of spatially variable audible effects associated with small induced earthquakes on local scales.
description: 36 pages, 11 figures
Additional file 1 of Economic burden of Cardiac Arrest in Spain: analyzing healthcare costs drivers and treatment strategies cost-effectiveness
Creators: name: Matilla-García, Mariano
name: Ubeda Molla, Paloma
name: Sánchez Martínez, Fernando
name: Ariza-Solé, Albert
name: Gómez-López, Rocío
name: López de Sá, Esteban
name: Ferrer, Ricard
Publisher: name: figshare
Year: 2023
Subjects: subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: Supplementary Material 1
Relación costo mercado en instalaciones hoteleras de la província de Ciego de Ávila
Creators: name: Ahu, María Emilia Aspiolea
name: Pérez, Rigoberto Pérez
name: Rodríguez, Yudelmys Rendón
name: Rodríguez, Olbeida Barrios
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: El crecimiento experimentado por el turismo en Cuba no ha sido proporcional al avance alcanzado por el sector, lo cual se expresa en bajos niveles de eficiência económica, este comportamiento es válido para el Polo Turístico Jardines dei Rey de la província de Ciego de Avila. El beneficio obtenido por una instalación hotelera es medido en términos de utilidad y es determinado por el comportamiento de los ingresos y los costos. La necesidad de inserción en un mercado cada vez más inestable y competitivo ha sido la causa de los bajos precios ofertados por los hoteles de este polo turístico, jo cual ha afectado la rentabilidad que necesitan para operar adecuadamente, trabajar sobre los costos para reducirlos hasta el nivel que impone el mercado es la base de la técnica de costo objetivo o target costing que se expone en el trabajo. En general el objetivo dei trabajo se resume de la forma siguiente: Aplicar la técnica de costo objetivo, para elevar la eficiência económica en instalaciones hoteleras y lograr un turismo sostenible en la província de Ciego de Avila. Los resultados evidencian que la reducción de costos es un imperativo y en función de esta meta se deben trazar estratégias. El trabajo se inicio en el ano 2000 y sus resultados se han aplicado en vários hoteles dei polo de diferentes cadenas.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
title: In Erwägung, daß die Vollmacht der hohen Nationalversammlung, wie ausgedehnt sie auch ist, doch nicht so weit reichen kann, unabänderliche Beschlüsse zu fassen, daß alle Bestimmungen der Verfassung und der Grundrechte durch den selbstherrlichen Willen des deutschen Volkes ...; [1849]
title: Frankfurt a. M., [...]. Januar 1849
titleType: Subtitle
Creators: name: Wuttke, Heinrich
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Ohne Titel. - In Fraktur
Gate-tunable anomalous Hall effect in stacked van der Waals ferromagnetic insulator - topological insulator heterostructures
Creators: name: Allcca, Andres E. Llacsahuanga
name: Pan, Xing-Chen
name: Miotkowski, Ireneusz
name: Tanigaki, Katsumi
name: Chen, Yong P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The search of novel topological phases, such as the quantum anomalous Hall insulator (QAHI) or the axion insulator, has motivated different schemes to introduce magnetism into topological insulators. One scheme is to introduce ferromagnetic dopants in topological insulators. However, it is generally challenging and requires carefully engineered growth/heterostructures or relatively low temperatures to observe the QAHI due to issues such as the added disorder with ferromagnetic dopants. Another promising scheme is using the magnetic proximity effect with a magnetic insulator to magnetize the topological insulator. Most of these heterostructures are synthesized so far by growth techniques such as molecular beam epitaxy and metallic organic chemical vapor deposition. These are not readily applicable to allow mixing and matching many of the available ferromagnetic and topological insulators due to difference in growth conditions and lattice mismatch. Here, we demonstrate that the magnetic proximity effect can still be obtained in stacked heterostructures assembled via the dry transfer of exfoliated micrometer-sized thin flakes of van der Waals topological insulator and magnetic insulator materials (BiSbTeSe2/Cr2Ge2Te6), as evidenced in the observation of an anomalous Hall effect (AHE). Furthermore, devices made from these heterostructures can allow modulation of the AHE when controlling the carrier density via electrostatic gating. These results show that simple mechanical transfer of magnetic van der Waals materials provides another possible avenue to magnetize topological insulators by magnetic proximity effect, a key step towards further realization of novel topological phases such as QAHI and axion insulators.
description: 22 pages, 10 figures
Pulsar Timing Arrays and the cosmological constant
Creators: name: Espriu, Domenec
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this talk I review how a non-zero cosmological constant $Λ$ affects the propagation of gravitational waves and their detection in pulsar timing arrays (PTA). If $Λ\neq 0$ it turns out that waves are anharmonic in cosmological Friedmann-Robertson- Walker coordinates and although the amount of anharmonicity is very small it leads to potentially measurable effects. The timing residuals induced by gravitational waves in PTA would show a peculiar angular dependence with a marked enhancement around a particular value of the angle subtended by the source and the pulsars. This angle depends mainly on the actual value of the cosmological constant and the distance to the source. Preliminary estimates indicate that the enhancement can be rather notorious for supermassive black hole mergers and in fact it could facilitate the first direct detection of gravitational waves while at the same time representing a `local' measurement of $Λ$.
description: 13 pages, 7 figures (in 14 separate files), invited talk at the 2nd Russian-Spanish meeting on particle physics at all scales, Saint Petersburg (Russia), October 2013
Ergodicity of the Wang--Swendsen--Kotecký algorithm on several classes of lattices on the torus
Creators: name: Salas, Jesús
name: Sokal, Alan D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove the ergodicity of the Wang--Swendsen--Kotecký (WSK) algorithm for the zero-temperature $q$-state Potts antiferromagnet on several classes of lattices on the torus. In particular, the WSK algorithm is ergodic for $q\ge 4$ on any quadrangulation of the torus of girth $\ge 4$. It is also ergodic for $q \ge 5$ (resp. $q \ge 3$) on any Eulerian triangulation of the torus such that one sublattice consists of degree-4 vertices while the other two sublattices induce a quadrangulation of girth $\ge 4$ (resp.~a bipartite quadrangulation) of the torus. These classes include many lattices of interest in statistical mechanics.
description: 27 pages, pdflatex, and 22 pdf figures. Corrected an error in Remark 4 after Theorem 4.4. Final version
Porque viajam os alunos de pós-graduação da FEUALG?
Creators: name: Correia, Antónia
name: Valle, Patrícia Oom Do
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: As motivações do turista são fundamentais no processo de decisão turística e na formação da imagem do destino (Correia e Crouch, 2003). Durante as últimas décadas, a balança turística portuguesa apresentou sempre um saldo positivo. Poucos eram os portugueses que faziam férias no exterior ou até mesmo os que faziam férias. No sentido de fomentar o interesse pela investigação na área das férias dos portugueses, o presente estudo apresenta os principais resultados da aplicação de um conjunto de métodos estatísticos multivariados com o objectivo de caracterizar a procura turística dos estudantes de mestrado e de pós-graduação da Faculdade de Economia da Universidade do Algarve (FEUALG). As análises efectuadas permitiram obter três dimensões de escolha do destino turístico, bem como três grupos de turistas com motivações diferentes para fazer férias.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
A regulação jurídica dos territórios turísticos - Portugal e estudo de casos internacionais
Creators: name: Machado, Virgílio
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: O presente artigo discute o valor dos territórios turísticos e em que medida a sua regulação jurídica é, ou pode vir a ser, factor estratégico de planeamento, desenvolvimento e promoção dos serviços e organizações turísticas que operam nesses territórios. Para tanto, o território turístico é considerado como um sinal distintivo, o resultado da congregação de projectos, empreendimentos, iniciativas ou actividades, designadamente, promocionais, em redor de um valor conjunto - a protecção e valorização da imagem de um destino turístico. Tal imagem projectada, através de símbolos ou elementos comunicacionais, os "sinais geoturísticos" identificam uma nova dimensão do espaço turístico, entendido enquanto valor regulatório jurídico-institucional acrescentado aos serviços e organizações turísticas. A investigação procurou demonstrar este valor geo-turístico, analisando, por um lado, a evolução legislativa portuguesa e, por outro, o estudo de casos internacionais, concluindo-se por um défice de regulação normativa portuguesa, desvirtuador da utilização das capacidades estratégicas dos "sinais geo-turísticos", ao serviço da organização e promoção dos destinos turísticos portugueses.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
Turbulent drag reduction by spanwise wall forcing. Part 2: High-Reynolds-number experiments
Creators: name: Chandran, Dileep
name: Zampiron, Andrea
name: Rouhi, Amirreza
name: Fu, Matt K.
name: Wine, David
name: Holloway, Brian
name: Smits, Alexander J.
name: Marusic, Ivan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Here, we present measurements of turbulent drag reduction in boundary layers at high friction Reynolds numbers in the range of $4500 \le Re_τ\le 15000$. The efficacy of the approach, using streamwise travelling waves of spanwise wall oscillations, is studied for two actuation regimes: (i) inner-scaled actuation (ISA), as investigated in Part 1 of this study, which targets the relatively high-frequency structures of the near-wall cycle, and (ii) outer-scaled actuation (OSA), which was recently presented by Marusic et al. (Nat. Commun., vol. 12, 2021) for high-$Re_τ$ flows, targeting the lower-frequency, outer-scale motions. Multiple experimental techniques were used, including a floating-element balance to directly measure the skin-friction drag force, hot-wire anemometry to acquire long-time fluctuating velocity and wall-shear stress, and stereoscopic-PIV (particle image velocimetry) to measure the turbulence statistics of all three velocity components across the boundary layer. Under the ISA pathway, drag reduction of up to 25% was achieved, but mostly with net power saving losses due to the high-input power cost associated with the high-frequency actuation. The low-frequency OSA pathway, however, with its lower input power requirements, was found to consistently result in positive net power savings of 5 - 10%, for moderate drag reductions of 5 - 15%. The results suggest that OSA is an attractive pathway for energy-efficient drag reduction in high Reynolds number applications. Both ISA and OSA strategies are found to produce complex inter-scale interactions, leading to attenuation of the turbulent fluctuations across the boundary layer for a broad range of length and time scales.
Cyber Network Resilience against Self-Propagating Malware Attacks
Creators: name: Chernikova, Alesia
name: Gozzi, Nicolò
name: Boboila, Simona
name: Angadi, Priyanka
name: Loughner, John
name: Wilden, Matthew
name: Perra, Nicola
name: Eliassi-Rad, Tina
name: Oprea, Alina
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: Dynamical Systems (math.DS)
subject: Spectral Theory (math.SP)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Self-propagating malware (SPM) has led to huge financial losses, major data breaches, and widespread service disruptions in recent years. In this paper, we explore the problem of developing cyber resilient systems capable of mitigating the spread of SPM attacks. We begin with an in-depth study of a well-known self-propagating malware, WannaCry, and present a compartmental model called SIIDR that accurately captures the behavior observed in real-world attack traces. Next, we investigate ten cyber defense techniques, including existing edge and node hardening strategies, as well as newly developed methods based on reconfiguring network communication (NodeSplit) and isolating communities. We evaluate all defense strategies in detail using six real-world communication graphs collected from a large retail network and compare their performance across a wide range of attacks and network topologies. We show that several of these defenses are able to efficiently reduce the spread of SPM attacks modeled with SIIDR. For instance, given a strong attack that infects 97% of nodes when no defense is employed, strategically securing a small number of nodes (0.08%) reduces the infection footprint in one of the networks down to 1%.
description: 20 pages
Ultra-compact Silicon Multimode Waveguide Bends Based on Special Curves for Dual Polarizations
Creators: name: Wang, Juanli
name: Sun, Shangsen
name: Zhang, Runsen
name: Zhang, Fengchun
name: Zhu, Ning
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The multimode waveguide bends (MWBs) with very compact sizes are the key building blocks in the applications of different mode-division multiplexing (MDM) systems. To further increase the transmission capacity, the silicon multimode waveguide bends for dual polarizations are of particular interest considering the very distinct mode behaviors under different polarizations in the silicon waveguides. Seldom silicon MWBs suitable for both polarizations have been studied. In this paper we analyze several dual-polarization-MWBs based on different bending curve functions. These special curve-based silicon MWBs have the advantages of easy fabrication and low loss compared with other structures based on the subwavelength structures such as gratings. A comparison is made between the free-form curve, Bezier curve, and Euler curve, which are used in the bending region instead of a conventional arc. The transmission spectra of the first three TE and TM modes in the silicon multimode waveguide with a core thickness of 340 nm are investigated. The simulation results indicate that in the premise of the same effective radius which is only 10 in this paper, the 6-mode MWB based on the free-form curve has the optimal performances, including an extremely low loss below 0.052dB and low crosstalk below -25.97dB for all six modes in the wide band of 1500-1600 nm. The MWBs based on the Bezier and Euler curve have degraded performances in terms of the loss and crosstalk. The results of this paper provide an efficient design method of the polarization insensitive silicon MWBs, which may leverage the researches for establishing complicated optical transmission systems incorporating both the MDM and polarization-division multiplexing (PDM) technology.
description: 18 pages
Lisbon as a city break destination: competitive analysis as perceived by London travel agents
Creators: name: Moital, Miguel
name: Peres, Rita
name: Costa, Cátia
Publisher: name: Journal of Tourism & Development
Year: 2005

description: Previous research has failed to assess destination image from a direct competitive point of view. This study aime d to overcome this gap by proposing a methodolog y where by a destination is directly compared to its competitors . It does it from a travei agents perspective because the images that these important elements of the tourism distribution channel hold about a destination are one of the determinants in the consumer decision - making process . Lisbon was compared to two other city break destinations in both cognitive and affective images . Results showed that the competitive images of Lisbon were , to a certain extent, different to both destinations and overall Lisbon was perceived as more appealing for a city break than Copenhagen but less than Amsterdam . Implications for the management of Lisbon as a city break destination are discussed.
description: Journal of Tourism & Development, n.º 3 (2005)
$\mathbfΔ$S$^z$=2 quantum magnetization discontinuities proportional in number to the spin s in C$_{60}$: Origin and the role of symmetry
Creators: name: Konstantinidis, N. P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The quantum antiferromagnetic Heisenberg model on the fullerene C$_{60}$ in a magnetic field has $4s$ ground-state magnetization discontinuities with $ΔS^z=2$ as a function of the spin quantum number $s$ that disappear at the classical limit. The molecule can be seen as the fullerene C$_{20}$ with interpentagon interactions that generate the discontinuities when sufficiently strong. The discontinuities originate from the antiferromagnetic Ising limit for both molecules. The results show how spatial symmetry dictates the magnetic response of the $I_h$ fullerene molecules.
description: 30 pages, 11 figures, 14 tables
A modelação das previsões sobre a procura turística
Creators: name: Silva, Sancho
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: Através de um estudo efectuado para a Direcção-Geral do Turismo em Novembro de 2003, o signatário procedeu à previsão da evolução da procura turística externa em Portugal para o horizonte de médio e longo prazo. Assim, no presente artigo, apresenta-se uma síntese do percurso metodológico definido, com particular realce para a descrição do modelo de projecção macroeconómico utilizado e para a avaliação da sua consistência face aos dados reais do passado.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
Photometry of Variable Stars from Dome A, Antarctica: Results from the 2010 Observing Season
Creators: name: Wang, Lingzhi
name: Macri, Lucas M.
name: Wang, Lifan
name: Ashley, Michael C. B.
name: Cui, Xiangqun
name: Feng, Long-Long
name: Gong, Xuefei
name: Lawrence, Jon S.
name: Liu, Qiang
name: Luong-Van, Daniel
name: Pennypacker, Carl R.
name: Shang, Zhaohui
name: Storey, John W. V.
name: Yang, Huigen
name: Yang, Ji
name: Yuan, Xiangyan
name: York, Donald G.
name: Zhou, Xu
name: Zhu, Zhenxi
name: Zhu, Zonghong
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present results from a season of observations with the Chinese Small Telescope ARray (CSTAR), obtained over 183 days of the 2010 Antarctic winter. We carried out high-cadence time-series aperture photometry of 20,000 stars with i<15.3 mag located in a 23 square-degree region centered on the south celestial pole. We identified 188 variable stars, including 67 new objects relative to our 2008 observations, thanks to broader synoptic coverage, a deeper magnitude limit and a larger field of view. We used the photometric data set to derive site statistics from Dome A. Based on two years of observations, we find that extinction due to clouds at this site is less than 0.1 and 0.4 mag during 45% and 75% of the dark time, respectively.
description: Accepted for publication in the Astronomical Journal. Light curves and finding charts of all variable stars will be made available at http://casdc.china-vo.org/data/cstar
Additional file 1 of Optimal allocation of physicians improves accessibility and workload disparities in stroke care
Creators: name: Ohashi, Kazuki
name: Osanai, Toshiya
name: Bando, Kyohei
name: Fujiwara, Kensuke
name: Tanikawa, Takumi
name: Tani, Yuji
name: Takamiya, Soichiro
name: Sato, Hirotaka
name: Morii, Yasuhiro
name: Ishikawa, Tomoki
name: Ogasawara, Katsuhiko
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer

description: Supplementary Material 1
Gravitational wave of the Bianchi VII universe: particle trajectories, geodesic deviation and tidal accelerations
Creators: name: Osetrin, Konstantin
name: Osetrin, Evgeny
name: Osetrina, Elena
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 83C35

description: For the gravitational wave model based on the type III Shapovalov wave space-time, test particle trajectories and the exact solution of geodesic deviation equations for the Bianchi type VII universe are obtained. Based on the found 4-vector of deviation, tidal accelerations in a gravitational wave are calculated. For the obtained solution in a privileged coordinate system, an explicit form of transformations into a synchronous reference system is found, which allows time synchronization at any points of space-time with separation of time and spatial coordinates. The synchronous reference system used is associated with a freely falling observer on the base geodesic. In a synchronous coordinate system, an explicit form of the gravitational wave metric, a 4-vector of geodesic deviation, and a 4-vector of tidal accelerations in a gravitational wave are obtained. The exact solution describes a variant of the primordial gravitational wave. The results of the work can be used to study the plasma radiation generated by tidal accelerations of a gravitational wave.
description: 21 pages
Existence and stability of a periodic solution of a general difference equation with applications to neural networks with a delay in the leakage terms
Creators: name: Bento, António J. G.
name: Oliveira, José J.
name: Silva, César M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34K13, 34K25, 92C20

description: In this paper, a new global exponential stability criterion is obtained for a general multidimensional delay difference equation using induction arguments. In the cases that the difference equation is periodic, we prove the existence of a periodic solution by constructing a type of Poincaré map. The results are used to obtain stability criteria for a general discrete-time neural network model with a delay in the leakage terms. As particular cases, we obtain new stability criteria for neural network models recently studied in the literature, in particular for low-order and high-order Hopfield and Bidirectional Associative Memory(BAM).
description: 20 pages, 3 figures
Multiple breaking patterns in the Brout-Englert-Higgs effect beyond perturbation theory
Creators: name: Dobson, Elizabeth
name: Maas, Axel
name: Riederer, Bernd
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In many BSM theories, especially GUTs, introducing a Brout-Englert-Higgs effect allows for multiple breaking patterns of the gauge symmetry. The possibility to select a particular pattern is usually decisive for the phenomenological viability of a theory. Beyond perturbation theory it is necessary to replace the Brout-Englert-Higgs effect by a manifestly gauge-invariant description. We study the simplest case with multiple breaking patterns, an $\textrm{SU}(3)$ Yang-Mills theory coupled to a single scalar `Higgs' field in the adjoint representation, on the lattice. We find that only one pattern remains at fixed parameters and gauge-fixing strategy, and that the associated quantum effective potential emerges from a non-trivial interplay of many aspects.
description: 32 pages, 22 figures (with several subfigures), 1 table
Bethe-Salpeter Equations from the 4PI effective action
Creators: name: Carrington, M. E.
name: Fu, WeiJie
name: Fugleberg, T.
name: Pickering, D.
name: Russell, I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we derive a hierarchy of integral equations from the 4PI effective action which have the form of Bethe-Salpeter equations. We show that, together with the equation of motion for the self-consistent 4-vertex, these integral equations are closed, and that their expansions give infinite series of connected diagrams which have the correct symmetry.
description: 20 pages, 13 figures
Segurança, higiene e saúde na hotelaria portuguesa. O caso do distrito de Aveiro
Creators: name: Santos, Rossana
name: Costa, Carlos
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: Sendo o sector do alojamento um dos principais componentes do sistema do turismo e constatando-se existirem tendências mundiais ao nível das diversas vertentes da indústria hoteleira, a segurança, higiene e saúde assumem uma posição central neste artigo, uma vez que se apresentam como uma das maiores forças de mudança, contribuindo, assim, com desafios significativos para esta indústria. A análise e enquadramento do sector em Portugal bem como a análise da procura, no sentido de se perceber o seu comportamento e as suas novas exigências, permitem demonstrar que a procura turística é particularmente sensível aos problemas de segurança, higiene e saúde, influenciando negativamente as taxas de ocupação no sector hoteleiro. Deste modo, são propostas medidas baseadas naquelas tendências mundiais que podem contribuir para prevenir e melhorar a segurança, higiene e saúde no sector hoteleiro, em Portugal. Pelo facto de se constatar que algumas daquelas ainda não são contempladas na lei nacional, são feitas recomendações para o serem no futuro, tendo em vista o reforço de medidas legislativas e regulamentares destinadas ao sector nestas áreas, resultando, assim, num aumento das suas taxas de ocupação.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
Managing relationship with corporate clients: a case study of the hotel industry in Goa
Creators: name: Vieira, Armando Luis
name: Costa, Carlos
name: Fernandes, Rathisha
Publisher: name: Journal of Tourism & Development
Year: 2005

description: Based on the results of a multiple-case study, this paper explores the marketing strategies used by hoteliers in Goa, a '365 days on a holiday spof. Particular attention is paid to evidences of the practice of relationship marketing and managerial suggestions are presented.
description: Journal of Tourism & Development, n.º 3 (2005)
Contributos para o marketing de destinos rurais - o caso do norte de Portugal
Creators: name: Kastenholz, Elisabeth
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2005

description: O turismo rural tem sido apontado como uma oportunidade para a diversificação da oferta e imagem do destino Portugal, capaz de atrair "novos mercados" para "novos destinos", potenciando o desenvolvimento dos mesmos. Contudo, o grau em que este turismo é, efectivamente, capaz de corresponder às diversas e elevadas expectativas depende, para além do real potencial do destino, da capacidade para atrair e satisfazer um mercado turístico heterogéneo e exigente. Neste contexto, a pesquisa de mercado é imprescindível, permitindo conhecer os visitantes do destino, compreender os seus comportamentos, motivações, desejos, percepções e frustrações. A relevância destes dados para a definição de estratégias ao nível do marketing de destinos será discutida com base nos resultados de um estudo de mercado realizado em áreas rurais no Norte de Portugal.
description: Revista Turismo & Desenvolvimento, n.º 3 (2005)
Determining Lamé coefficients by elastic Dirichlet-to-Neumann map on a Riemannian manifold
Creators: name: Tan, Xiaoming
name: Liu, Genqian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: For the Lamé operator $\mathcal{L}_{λ,μ}$ with variable coefficients $λ$ and $μ$ on a smooth compact Riemannian manifold $(M,g)$ with smooth boundary $\partial M$, we give an explicit expression for full symbol of the elastic Dirichlet-to-Neumann map $Λ_{λ,μ}$. We show that $Λ_{λ,μ}$ uniquely determines partial derivatives of all orders of the Lamé coefficients $λ$ and $μ$ on $\partial M$. Moreover, for a nonempty open subset $Γ\subset\partial M$, suppose that the manifold and the Lamé coefficients are real analytic up to $Γ$, we prove that $Λ_{λ,μ}$ uniquely determines the Lamé coefficients on the whole manifold $\bar{M}$.
description: 18
Social Influence and the Collective Dynamics of Opinion Formation
Creators: name: Moussaid, Mehdi
name: Kaemmer, Juliane E.
name: Analytis, Pantelis P.
name: Neth, Hansjoerg
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Social influence is the process by which individuals adapt their opinion, revise their beliefs, or change their behavior as a result of social interactions with other people. In our strongly interconnected society, social influence plays a prominent role in many self-organized phenomena such as herding in cultural markets, the spread of ideas and innovations, and the amplification of fears during epidemics. Yet, the mechanisms of opinion formation remain poorly understood, and existing physics-based models lack systematic empirical validation. Here, we report two controlled experiments showing how participants answering factual questions revise their initial judgments after being exposed to the opinion and confidence level of others. Based on the observation of 59 experimental subjects exposed to peer-opinion for 15 different items, we draw an influence map that describes the strength of peer influence during interactions. A simple process model derived from our observations demonstrates how opinions in a group of interacting people can converge or split over repeated interactions. In particular, we identify two major attractors of opinion: (i) the expert effect, induced by the presence of a highly confident individual in the group, and (ii) the majority effect, caused by the presence of a critical mass of laypeople sharing similar opinions. Additional simulations reveal the existence of a tipping point at which one attractor will dominate over the other, driving collective opinion in a given direction. These findings have implications for understanding the mechanisms of public opinion formation and managing conflicting situations in which self-confident and better informed minorities challenge the views of a large uninformed majority.
description: Published Nov 05, 2013. Open access at: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0078433
Resource Guide for Teaching Post-Quantum Cryptography
Creators: name: Holden, Joshua
Publisher: name: arXiv
Year: 2022
Subjects: subject: History and Overview (math.HO)
subject: Cryptography and Security (cs.CR)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 97F60, 97H40, 97P20

description: Public-key cryptography has become a popular way to motivate the teaching of concepts in elementary number theory, abstract algebra, and introduction to proof courses, as well as in cryptography courses. Unfortunately, many experts expect quantum computers to make common forms of public-key cryptography obsolete in the near future. Fortunately, there are several systems being evaluated to replace RSA and the other systems we currently use. While some of the systems are too complicated to be good examples in introductory courses, others are either quite manageable or have simplified versions which are manageable. This article gives a tour of the main types of systems under consideration and the teaching resources available for instructors who want to teach them.
description: 9 pages. This article has been accepted for publication in Cryptologia, published by Taylor & Francis
Ground-state 12CO emission and a resolved jet at 115 GHz (rest-frame) in the radio loud quasar 3C318
Creators: name: Heywood, Ian
name: Martinez-Sansigre, Alejo
name: Willott, Chris J.
name: Rawlings, Steve
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: An analysis of 44 GHz VLA observations of the z = 1.574 radio-loud quasar 3C318 has revealed emission from the redshifted J = 1 - 0 transition of the CO molecule and spatially resolved the 6.3 kpc radio jet associated with the quasar at 115 GHz rest-frame. The continuum-subtracted line emitter is spatially offset from the quasar nucleus by 0.33" (2.82 kpc in projection). This spatial offset has a significance of >8-sigma and, together with a previously published -400 km/s velocity offset measured in the J = 2 - 1 CO line relative to the systemic redshift of the quasar, rules out a circumnuclear starburst or molecular gas ring and suggests that the quasar host galaxy is either undergoing a major merger with a gas-rich galaxy or is otherwise a highly disrupted system. If the merger scenario is correct then the event may be in its early stages, acting as the trigger for both the young radio jets in the quasar and a starburst in the merging galaxy. The total molecular gas mass in the spatially offset line emitter as measured from the ground-state CO line M_H2 = 3.7 (+/-0.4) x 10^10 (alpha_CO/0.8) M_solar. Assuming that the line-emitter can be modelled as a rotating disk, an inclination-dependent upper limit is derived for its dynamical mass M_dyn sin^2(i) < 3.2 x 10^9 M_solar, suggesting that for M_H2 to remain less than M_dyn the inclination angle must be i < 16 degrees. The far infrared and CO luminosities of 246 extragalactic systems are collated from the literature for comparison. The high molecular gas content of 3C318 is consistent with that of the general population of high redshift quasars and sub-millimetre galaxies.
description: 10 pages, 4 figures, 2 tables (additional table to appear online as supplementary material), accepted for publication in MNRAS
Interlacing in atomic resolution scanning transmission electron microscopy
Creators: name: Peters, Jonathan J. P
name: Mullarkey, Tiarnan
name: Gott, James A.
name: Nelson, Elizabeth
name: Jones, Lewys
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Fast frame-rates are desirable in scanning transmission electron microscopy for a number of reasons: controlling electron beam dose, capturing in-situ events or reducing the appearance of scan distortions. Whilst several strategies exist for increasing frame-rates, many impact image quality or require investment in advanced scan hardware. Here we present an interlaced imaging approach to achieve minimal loss of image quality with faster frame-rates that can be implemented on many existing scan controllers. We further demonstrate that our interlacing approach provides the best possible strain precision for a given electron dose compared with other contemporary approaches.
Suplemento: REABILITAÇÃO DA APRENDIZAGEM COM A ESTRATÉGIA FLIPPED CLASSROOM
Creators: name: Oliveira, Paulo
Publisher: name: figshare
Year: 2023
Subjects: Science, technology and engineering curriculum and pedagogy
Developmental genetics (incl. sex determination)
Higher education
Education assessment and evaluation

description: This is a supplement to the proceedings article REABILITAÇÃO DA APRENDIZAGEM COM A ESTRATÉGIA FLIPPED CLASSROOM, presented at the 8º CONGRESSO NACIONAL DE PRÁTICAS PEDAGÓGICAS NO ENSINO SUPERIOR, COIMBRA, JULHO DE 2022. Language: Portuguese.
Synthetic gauge field in two interacting ultracold atomic gases without an optical lattice
Creators: name: Mumford, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A 2D Fock-state lattice (FSL is constructed from the many-body states of two interacting two-mode quantum gases. By periodically driving the interspecies interactions and pulsing the tunneling between the two modes of each gas, a synthetic gauge field is generated. We derive an effective Hamiltonian in the short pulse limit which resembles the Harper-Hofstadter Hamiltonian where the magnetic flux per plaquette is controlled by the ratio of the interaction energy and the driving frequency. The quasispectrum of the Floquet operator of the driving sequence shows the celebrated Hofstadter's butterfly pattern as well as the existence of edge states. From the calculation of the local Chern marker, we establish that the FSL has non-trivial topology and by simulating the dynamics of the edge states, show that they exhibit chirality. Finally, the inclusion of the intraspecies interactions creates an overall harmonic trap in the lattice and introduces the nonlinear effect of macroscopic quantum self-trapping which is shown to hinder the movement along the edge of the lattice. This work introduces a new avenue to explore synthetic gauge fields and provides a link between non-trivial condensed matter systems and quantum gases.
description: 11 pages, 6 figures