cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multiplex PageRank
Creators: name: Halu, Arda
name: Mondragon, Raul J.
name: Panzarasa, Pietro
name: Bianconi, Ginestra
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Many complex systems can be described as multiplex networks in which the same nodes can interact with one another in different layers, thus forming a set of interacting and co-evolving networks. Examples of such multiplex systems are social networks where people are involved in different types of relationships and interact through various forms of communication media. The ranking of nodes in multiplex networks is one of the most pressing and challenging tasks that research on complex networks is currently facing. When pairs of nodes can be connected through multiple links and in multiple layers, the ranking of nodes should necessarily reflect the importance of nodes in one layer as well as their importance in other interdependent layers. In this paper, we draw on the idea of biased random walks to define the Multiplex PageRank centrality measure in which the effects of the interplay between networks on the centrality of nodes are directly taken into account. In particular, depending on the intensity of the interaction between layers, we define the Additive, Multiplicative, Combined, and Neutral versions of Multiplex PageRank, and show how each version reflects the extent to which the importance of a node in one layer affects the importance the node can gain in another layer. We discuss these measures and apply them to an online multiplex social network. Findings indicate that taking the multiplex nature of the network into account helps uncover the emergence of rankings of nodes that differ from the rankings obtained from one single layer. Results provide support in favor of the salience of multiplex centrality measures, like Multiplex PageRank, for assessing the prominence of nodes embedded in multiple interacting networks, and for shedding a new light on structural properties that would otherwise remain undetected if each of the interacting networks were analyzed in isolation.
description: (16 pages, 6 figures)
Does Chaplygin gas have salvation?
Creators: name: Campos, Juliano Pereira
name: Fabris, Júlio César
name: Perez, Rafael
name: Piattella, Oliver F.
name: Velten, Hermano
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the unification scenario provided by the generalised Chaplygin gas model (a perfect fluid characterized by an equation of state p = -A/ρ^α). Our concerns lie with a possible tension existing between background kinematic tests and those related to the evolution of small perturbations. We analyse data from the observation of the differential age of the universe, type Ia supernovae, baryon acoustic oscillations and the position of the first peak of the angular spectrum of the cosmic background radiation. We show that these tests favour negative values of the parameter α: we find α= - 0.089^{+0.161}_{-0.128} at the 2σ level and that α< 0 with 85% confidence. These would correspond to negative values of the square speed of sound which are unacceptable from the point of view of structure formation. We discuss a possible solution to this problem, when the generalised Chaplygin gas is framed in the modified theory of gravity proposed by Rastall. We show that a fluid description within this theory does not serve the purpose, but it is necessary to frame the generalised Chaplygin gas in a scalar field theory. Finally, we address the standard general relativistic unification picture provided by the generalised Chaplygin gas in the case α= 0: this is usually considered to be undistinguishable from the standard ΛCDM model, but we show that the evolution of small perturbations, governed by the Mészáros equation, is indeed different and the formation of sub-horizon GCG matter halos may be importantly affected in comparison with the ΛCDM scenario.
description: 21 pages, 9 figures, Changes in Section VI, accepted for publication in EJPC
Comment on "Protocol for Direct Counterfactual Quantum Communication" [arXiv:1206.2042]
Creators: name: Vaidman, Lev
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I argue that recent "Protocol for Direct Counterfactual Quantum Communication" by Salih et al. [PRL 110, 170502 (2013), arXiv:1206.2042] is counterfactual only for one type of the information bit.
description: Correction of a misspelled name
title: Tsunami modelling for Porirua City: the methodology to inform land use planning response
Creators: name: Gusman, Aditya R.
name: Power, William L.
name: Mueller, Christof
Publisher: name: GNS Science
Year: 2019

description: Tsunami pose a risk to communities on the New Zealand coast and land-use planning is one of the key methods for mitigating that risk. This report includes a probabilistic assessment of the tsunami inundation hazard to the city of Porirua. The method used is to identify earthquake caused tsunami scenarios contributing to the tsunami hazard at the coast at chosen return periods (100, 500, 1000, 2500 years) and model these scenarios through to inundation. The resulting maps of inundation are then combined to produce the probabilistic hazard maps. The analysis was repeated for various assumed levels of sea-level rise (0.65m, 1.0m, 1.99m), which showed that the likelihood of tsunami inundation of low-lying parts of Porirua increases rapidly with the assumed level of sea rise. In addition to covering the central areas of Porirua, the hazard analysis was extended to cover Pukerua Bay. (auth)
A survey of young, nearby, and dusty stars to understand the formation of wide-orbit giant planets
Creators: name: Rameau, J.
name: Chauvin, G.
name: Lagrange, A. -M.
name: Klahr, H.
name: Bonnefoy, M.
name: Mordasini, C.
name: Bonavita, M.
name: Desidera, S.
name: Dumas, C.
name: Girard, J. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Direct imaging has confirmed the existence of substellar companions on wide orbits. To understand the formation and evolution mechanisms of these companions, the full population properties must be characterized. We aim at detecting giant planet and/or brown dwarf companions around young, nearby, and dusty stars. Our goal is also to provide statistics on the population of giant planets at wide-orbits and discuss planet formation models. We report a deep survey of 59 stars, members of young stellar associations. The observations were conducted with VLT/NaCo at L'-band (3.8 micron). We used angular differential imaging to reach optimal detection performance. A statistical analysis of about 60 % of the young and southern A-F stars closer than 65 pc allows us to derive the fraction of giant planets on wide orbits. We use gravitational instability models and planet population synthesis models following the core-accretion scenario to discuss the occurrence of these companions. We resolve and characterize new visual binaries and do not detect any new substellar companion. The survey's median detection performance reaches contrasts of 10 mag at 0.5as and 11.5 mag at 1as. We find the occurrence of planets to be between 10.8-24.8 % at 68 % confidence level assuming a uniform distribution of planets in the interval 1-13 Mj and 1-1000 AU. Considering the predictions of formation models, we set important constraints on the occurrence of massive planets and brown dwarf companions that would have formed by GI. We show that this mechanism favors the formation of rather massive clump (Mclump > 30 Mj) at wide (a > 40 AU) orbits which might evolve dynamically and/or fragment. For the population of close-in giant planets that would have formed by CA, our survey marginally explore physical separations (<20 AU) and cannot constrain this population.
title: Media and Climate Change Observatory Monthly Summary: Talking about climate change is not an insult to bushfire victims - Issue 35, November 2019
Creators: name: Boykoff, Maxwell
name: Katzung, Jennifer
name: Nacu-Schmidt, Ami
Publisher: name: University of Colorado Boulder
Year: 2019

description: November media attention to climate change and global warming at the global level remained relatively steady from October 2019 coverage. However, across the globe, November 2019 news articles and segments about climate change and global warming was up 64% from a year earlier (November 2018). The ongoing stream of stories also continued for the most part in Europe, where regional coverage was steady, as was national-level coverage in the Germany, UK and Sweden as examples. An exception to this trend was coverage in Spain, where news accounts – some anticipating the United Nations (UN) Madrid-based round of climate talks (COP25) beginning December 2 – increased a bit, up 7% from October 2019.
title: ThinkNature / Nature-Based Solutions Handbook
Creators: name: Somarakis, Giorgos
name: Stagakis,  Stavros
name: Chrysoulakis, Nektarios
Publisher: name:  ThinkNature -  European Union’s Horizon 2020
Year: 2019

description: This Handbook has been developed in the framework of the ThinkNature project. Its main objective is to gather and promote state-of-the-art knowledge regarding Nature-Based Solutions (NBS), comprising a comprehensive guide to all relevant actors. To this end, each aspect of NBS is investigated, from project development to financing and policy making, and is presented in a concise and comprehensive way, in order to be easily understandable. Specifically, the Handbook is highly recommended to all stakeholder groups that use NBS in their work, but it can also be useful for other organisations and individuals that comprise potential NBS stakeholders. Additionally, many chapters can contribute to increasing public awareness about NBS. In respect of the structure of the Handbook, each chapter focuses on a separate issue (analysed and documented through specific subtopics) and targets different types of NBS stakeholders. In general, Chapters 1-4 provide general background knowledge, useful for everyone involved in NBS initiatives; Chapters 5-7 are more specialised, addressing issues relevant to different NBS stakeholder groups (i.e. Chapter 5 for research and innovation, Chapter 6 for business sector, and Chapter 7 for policy sector); and Chapter 8 concludes with key recommendations.
title: Особенности управления интеллектуальным капиталом агропромышленного комплекса региона
title: FEATURES OF INTELLECTUAL CAPITAL MANAGEMENT OF AGRO-INDUSTRIAL COMPLEX OF THE REGION
Creators: name: Ильченко, Елена Николаевна
Publisher: name: Издательский центр СурГУ
Year: 2019

description: В работе уделено внимание особенностям управления интеллектуальными ресурсами. Предложена структурная модель интеллектуального капитала для агропромышленного комплекса Курганской области. Данная модель аккумулирует в себе положительные стороны существующих подходов к управлению интеллектуальным капиталом, является достаточно «компактной» и не предполагает сложной системы показателей, что делает ее удобной и доступной в использовании.
description: The paper pays attention to the peculiarities of managing intellectual resources. A structural model of intellectual capital for the agro-industrial complex of Kurgan Oblast is proposed. The model collects the positive aspects of existing approaches to managing intellectual capital. It is quite “compact” and does not imply a complex system of indicators, which makes it convenient and accessible for use.
Line-of-sight geometrical and instrumental resolution effects on intensity perturbations by sausage modes
Creators: name: Antolin, Patrick
name: Van Doorsselaere, Tom
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Diagnostics of MHD waves in the solar atmosphere is a topic which often encounters problems of interpretation, due partly to the high complexity of the solar atmospheric medium. Forward modeling can significantly guide interpretation, bridging the gap between numerical simulations and observations, and increasing the reliability of mode identification for application of MHD seismology. In this work we aim at determining the characteristics of the fast MHD sausage mode in the corona on the modulation of observable quantities such as line intensity and spectral line broadening. Effects of line-of-sight angle, and spatial, temporal and spectral resolutions are considered. We take a cylindrical tube simulating a loop in a low-β coronal environment with an optically thin background, and let it oscillate with the fast sausage mode. A parametric study is performed. Among other results, we show that regardless of the ionisation state of the plasma, the variation of spectral line broadening can be significant, even for low intensity modulation. The nature of this broadening is not thermal but is mostly turbulent. This places spectrometers in clear advantage over imaging instruments for the detection of the sausage mode. The modulation of all quantities is considerably affected by the line-of-sight angle, and especially by the spatial and temporal resolution when these are on the order of the mode's wavelength and period. This places high constraints on instrumentation.
description: 16 pages, 20 figures
Non-linear curvature perturbation in multi-field inflation models with non-minimal coupling
Creators: name: White, Jonathan
name: Minamitsuji, Masato
name: Sasaki, Misao
Publisher: name: arXiv
Year: 2013
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: Using the δN formalism we consider the non-linear curvature perturbation in multi-field models of inflation with non-minimal coupling. In particular, we focus on the relation between the δN formalism as applied in the conformally related Jordan and Einstein frames. Exploiting results already known in the Einstein frame, we give expressions for the power spectrum, spectral tilt and non-gaussianity associated with the Jordan frame curvature perturbation. In the case that an adiabatic limit has not been reached, we find that in general these quantities differ from those associated with the Einstein frame curvature perturbation, and also confirm their equivalence in the absence of isocurvature modes. We then proceed to consider two analytically soluble examples, the first involving a non-minimally coupled `spectator' field and the second being a non-minimally coupled extension of the multi-brid inflation model. In the first model we find that predictions can easily be brought into agreement with the recent Planck results, as the tensor-to-scalar ratio is generally small, the spectral tilt tuneable and the non-gaussianity suppressed. In the second model we find that predictions for all three parameters can differ substantially from those predicted in the minimally coupled case, and that the recent Planck results for the spectral tilt can be used to constrain the non-minimal coupling parameters.
description: 27 pages, 4 figures, reference added, typos corrected, version to appear in JCAP
Sum Rate Maximization under AoI Constraints for RIS-Assisted mmWave Communications
Creators: name: Guo, Ziqi
name: Niu, Yong
name: Mao, Shiwen
name: Zhang, Changming
name: Wang, Ning
name: Zhong, Zhangdui
name: Ai, Bo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The concept of age of information (AoI) has been proposed to quantify information freshness, which is crucial for time-sensitive applications. However, in millimeter wave (mmWave) communication systems, the link blockage caused by obstacles and the severe path loss greatly impair the freshness of information received by the user equipments (UEs). In this paper, we focus on reconfigurable intelligent surface (RIS)-assisted mmWave communications, where beamforming is performed at transceivers to provide directional beam gain and a RIS is deployed to combat link blockage. We aim to maximize the system sum rate while satisfying the information freshness requirements of UEs by jointly optimizing the beamforming at transceivers, the discrete RIS reflection coefficients, and the UE scheduling strategy. To facilitate a practical solution, we decompose the problem into two subproblems. For the first per-UE data rate maximization problem, we further decompose it into a beamforming optimization subproblem and a RIS reflection coefficient optimization subproblem. Considering the difficulty of channel estimation, we utilize the hierarchical search method for the former and the local search method for the latter, and then adopt the block coordinate descent (BCD) method to alternately solve them. For the second scheduling strategy design problem, a low-complexity heuristic scheduling algorithm is designed. Simulation results show that the proposed algorithm can effectively improve the system sum rate while satisfying the information freshness requirements of all UEs.
Priority Based Pre-emptive Task Scheduling for Android Operating System
Creators: name: Kayande, Deepali
name: Shrawankar, Urmila
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Android mobile operating system which is based on Linux Kernel 2.6, has open source license and adaptability to user driven applications. As all other operating systems it has all the basic features like process scheduling, memory management, process management etc associated with it. Any mobile platform works smoothly when the process scheduling is performed in a proper way. Ideal platform is that in which no resource conflict occurs. Thus scheduling in every manner is essential for the operating system to adapt itself with the requirement of a particular application. In this paper, priority based pre-emptive task scheduling is proposed for the SMS application. The idea is to define High priority to required contacts, for ex. Contact numbers of parents or teachers will be given High priority. If in case, any SMS from these High priority contacts is received, the application would flash the SMS on the active screen and redirect this High priority SMS to the Priority Inbox.
description: Pages: 5 Figures : 10
Modeling coronal magnetic field using spherical geometry: cases with several active regions
Creators: name: Tadesse, Tilaye
name: Wiegelmann, T.
name: Olson, K.
name: MacNeice, P. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The magnetic fields in the solar atmosphere structure the plasma, store free magnetic energy and produce a wide variety of active solar phenomena, like flare and coronal mass ejections(CMEs). The distribution and strength of magnetic fields are routinely measured in the solar surface(photosphere). Therefore, there is considerable interest in accurately modeling the 3D structure of the coronal magnetic field using photospheric vector magnetograms. Knowledge of the 3D structure of magnetic field lines also help us to interpret other coronal observations, e.g., EUV images of the radiating coronal plasma. Nonlinear force-free field (NLFFF) models are thought to be viable tools for those task. Usually those models use Cartesian geometry. However, the spherical nature of the solar surface cannot be neglected when the field of view is large. In this work, we model the coronal magnetic field above multiple active regions using NLFFF extrapolation code using vector magnetograph data from the Synoptic Optical Long-term Investigations of the Sun survey (SOLIS)/ Vector Spectromagnetograph (VSM) as a boundary conditions. We compare projections of the resulting magnetic field lines solutions with their respective coronal EUV-images from the Atmospheric Imaging Assembly (SDO/AIA) observed on October 11, 2011 and November 13, 2012. This study has found that the NLFFF model in spherical geometry reconstructs the magnetic configurations for several active regions which agrees with observations. During October 11, 2011 observation, there are substantial number of trans-equatorial loops carrying electric current.
description: 3 Figures, Submitted to Astrophysics and Space Science Journal
Investigation of cation self-diffusion mechanisms in UO2+-x using molecular dynamics
Creators: name: Boyarchenkov, A. S.
name: Potashnikov, S. I.
name: Nekrasov, K. A.
name: Kupryazhkin, A. Ya.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: This article is devoted to investigation of cation self-diffusion mechanisms, taking place in UO2, UO2+x, and UO2-x crystals simulated under periodic (PBC) and isolated (IBC) boundary conditions using the method of molecular dynamics in the approximation of rigid ions and pair interactions. It is shown that under PBC the cations diffuse via an exchange mechanism (with the formation of Frenkel defects) with activation energy of 15-22 eV, while under IBC there is competition between the exchange and vacancy (via Schottky defects) diffusion mechanisms, which give the effective activation energy of 11-13 eV near the melting temperature of the simulated UO2.00 nanocrystals. Vacancy diffusion with lower activation energy of 6-7 eV was dominant in the non-stoichiometric crystals UO2.10, UO2.15 and UO1.85. Observations showed that a cation vacancy is accompanied by different number of anion vacancies depending on the deviation from stoichiometry: no vacancies in UO2.15, single vacancy in UO2.00 and four vacancies in UO1.85. The corresponding law of mass action formulas derived within the Lidiard-Matzke model allowed explaining the obtained activation energies and predicting a change in the activation energy within the temperature range of the superionic phase transition. The diffusion of cations on the surface of nanocrystals had activation energy of 3.1-3.6 eV.
description: 22 pages, 6 tables, 15 figures
Generic base algebras and universal comodule algebras for some finite-dimensional Hopf algebras
Creators: name: Iyer, Uma N.
name: Kassel, Christian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16R50, 16T05, 16T15

description: After recalling the definitions and the properties of the generic base algebra and of the universal comodule algebra attached to a Hopf algebra by Aljadeff and the second-named author, we determine these algebras for the Taft algebras, the Hopf algebras E(n), and certain monomial Hopf algebras.
description: 22 pages. Version 2: Sections 3 and 4 from Version 1 have been switched and proofs of Theorems 2.1, 3.1, 4.1 shortened; Section 1.4 has been enlarged and Section 1.9 suppressed
Pheidole bessonii Forel 1891, n. st.
Creators: name: Forel, A.
Publisher: name: L'Imprimerie Nationale
Year: 1891
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Pheidole
Pheidole bessonii

description: Race Pheidole Bessonii, n. st.,
[[worker]], (fig. 50). Ne diffère de la Ph. O'Swaldi typique que par les caractères suivants: Échancrure mésonotale plus profonde. Front, vertex, occiput, pronotum et mésonotum lisses et luisants. Pilositée dressée un peu plus courte et un peu moins abondante.
[[soldier]]. Inconnu.
Fianarantsoa (Dr Besson, vice-résident de France).
description: Published as part of Forel, A., 1891, Histoire naturelle des Hymenopteres. Deuxieme partie: Les Formicides., pp. 1-231 in Histoire Physique, Naturelle et Politique de Madagascar., Paris :L'Imprimerie Nationale on page 176, DOI: 10.5281/zenodo.9896
title: Ensemble Prediction of Oceanic Convective Hazards (EPOCH) Assessment: Part II
Creators: name: Melling, Laura D.
name: Laing, Arlene G.
name: Wandishin, Matthew S.
name: Hart, Joan E.
name: Petty, Melissa A.
Publisher: name: Earth System Research Laboratory (U.S.). Global Systems Division
Year: 2019

description: NOAA Technical Memorandum OAR GSD-65
Janus fluid with fixed patch orientations: theory and simulations
Creators: name: Maestre, Miguel Ángel G.
name: Fantoni, Riccardo
name: Giacometti, Achille
name: Santos, Andrés
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We study thermophysical properties of a Janus fluid with constrained orientations, using analytical techniques and numerical simulations. The Janus character is modeled by means of a Kern-Frenkel potential where each sphere has one hemisphere of square-well and the other of hard-sphere character. The orientational constraint is enforced by assuming that each hemisphere can only point either North or South with equal probability. The analytical approach hinges on a mapping of the above Janus fluid onto a binary mixture interacting via a "quasi" isotropic potential. The anisotropic nature of the original Kern-Frenkel potential is reflected by the asymmetry in the interactions occurring between the unlike components of the mixture. A rational-function approximation extending the corresponding symmetric case is obtained in the sticky limit, where the square-well becomes infinitely narrow and deep, and allows a fully analytical approach. Notwithstanding the rather drastic approximations in the analytical theory, this is shown to provide a rather precise estimate of the structural and thermodynamical properties of the original Janus fluid.
description: 20 pages, 10 figures; v2: minor changes plus corrections of typos [Eqs. (A6), (A17), and (A26)-(A28)] appearing in the published version
title: Гармонизация документов стратегического планирования как основа государственной научно-технической политики
title: HARMONIZATION OF STRATEGIC PLANNING DOCUMENTS AS BASIS OF STATE STRUCTURAL SCIENTIFIC AND TECHNOLOGICAL POLICY
Creators: name: Климович, Мария Александровна
Publisher: name: Издательский центр СурГУ
Year: 2019

description: В статье обоснована потребность структурных изменений в российской экономике. Перспективы макроэкономического развития автор связывает с возникновением новых отраслей и секторов на основе модернизированного технологического базиса, переходом к перспективной технологической парадигме. Для достижения позитивных сдвигов в научно-технологической сфере необходимо проведение активной государственной структурной научно-технологической политики. Предложены меры по гармонизации документов стратегического планирования в данной сфере.
description: The article proves the need for structural changes in the Russian economy. The author associates the prospects of macroeconomic development with the emergence of new industries and sectors on the basis of the modernized technological background and the transition to a promising technological paradigm. It is necessary to conduct an active state structural scientific and technological policy to achieve positive changes in the scientific and technological sphere. Measures for the harmonization of documents of strategic planning in this sphere are proposed.
Associated Press-NORC Survey
Creators: name: Associated Press
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Direction of country (1); President Joe Biden job approval (2); approval of Congress (1); economic state of country (1); expectations for the next year (3); confidence in Biden’s ability to handle national issues (14); Biden's respect for country's democratic institutions and traditions (1); impression of political leaders (8); America’s best days ahead/behind (1); how well democracy is working in the U.S. these days (1); division of Americans on the country’s important values (2); contribution of values to the United States’ identity as a nation (10); opinion on Donald Trump as a president (2); better/worse off after Trump’s presidency (2); whether Senate should vote to impeach Trump (1); responsibility Trump has for breach of the U.S. Capitol on January 6th (1); legitimacy of Biden’s election (1); worries about contracting viral infections (2); political views (2); description of community you live in now (1); vaccination status (4); plans on getting coronavirus (COVID-19) vaccine (2); reasons for not getting the vaccine (2).
A general approach of least squares estimation and optimal filtering
Creators: name: Lenoir, Benjamin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The least squares method allows fitting parameters of a mathematical model from experimental data. This article proposes a general approach of this method. After introducing the method and giving a formal definition, the transitivity of the method as well as numerical considerations are discussed. Then two particular cases are considered: the usual least squares method and the Generalized Least Squares method. In both cases, the estimator and its variance are characterized in the time domain and in the Fourier domain. Finally, the equivalence of the Generalized Least Squares method and the optimal filtering technique using a matched filter is established.
description: 7 pages
Numerical Solutions of Open String Field Theory in Marginally Deformed Backgrounds
Creators: name: Kishimoto, Isao
name: Takahashi, Tomohiko
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate numerical solutions of bosonic open string field theory in some marginally deformed backgrounds, which are obtained by expanding the action around an identity-based marginal solution with one parameter. We construct numerical solutions in the Siegel gauge and the Landau gauge corresponding to the tachyon vacuum. Their vacuum energy approximately cancels the D-brane tension for larger intervals of the parameter with increasing truncation level. The result is consistent with the previous expectation that the identity-based marginal solution has vanishing energy regardless of the values of the parameter. We also study the marginal branch (M-branch) and the vacuum branch (V-branch) and evaluate not only the vacuum energy but also the gauge invariant overlaps with the graviton and the closed tachyon. We observe that there is a finite bound for the value of the massless field of numerical solutions even in the marginally deformed background.
description: 23 pages, 32 figures; v2: minor corrections
Two-photon exchange corrections to elastic electron-proton scattering at large momentum transfer within the SCET approach
Creators: name: Kivel, N.
name: Vanderhaeghen, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the two-photon exchange (TPE) corrections in the region where the kinematical variables describing the elastic $ep$ scattering are moderately large momentum scales relative to the soft hadronic scale. For such kinematics we use the QCD factorization approach formulated in the framework of the soft-collinear effective theory (SCET). Such technique allows us to develop a description for the soft-spectator scattering contribution which is found to be important in the region of moderately large scales. Together with the hard-spectator contribution we present the complete factorization formulas for the TPE amplitudes at the leading power and leading logarithmic accuracy. The momentum region where both photons are hard is described by only one new nonperturbative SCET form factor. It turns out that the same form factor also arises for wide-angle Compton scattering which is also described in the framework of the SCET approach. This allows us to estimate the soft-spectator contribution associated with the hard photons in a model independent way. The main unknown in our description of the TPE contribution is related with the configuration where one photon is soft. The nonperturbative dynamics in this case is described by two unknown SCET amplitudes. We use a simple model in order to estimate their contribution. The formalism is then applied to a phenomenological analysis of existing data for the reduced cross section as well as for the transverse and longitudinal polarization observables.
description: 59 pages, 22 figures, text is improved, several typos are corrected, new appendix is added
Application of the Abel Equation of the 1st kind to an inflation analysis of non-exactly solvable cosmological models
Creators: name: Yaparova, Anna V.
name: Yurov, Artyom V.
name: Yurov, Valerian A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we revisit the relationship between the Einstein--Friedman and the Abel equations to demonstrate how it might be applied to the inflationary analysis in a flat Friedman universe filled with a real-valued scalar field. The analysis is performed for three distinct cases of polynomial potentials. As a result of a numeric integration of Abel equation, the necessary and sufficient conditions for both slow-rolling and inflation proper are estimated with respect to the initial value of the field. In addition, the relationship between the slow-rolling condition and the inflation is ascertained.
description: 18 pages, 17 figures, 4 tables
Photometric studies of open star clusters Haffner 11 and Czernik 31
Creators: name: Bisht, D.
name: Yadav, R. K. S.
name: Durgapal, A. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the broad band UBVI CCD photometric investigations in the region of the two open clusters Haffner 11 and Czernik 31. The radii of the clusters are determined as 3.5 arcmin and 3.0 arcmin for Haffner 11 and Czernik 31 respectively. Using two colour (U-B) versus (B-V) diagram we determine the reddening E(B-V) = 0.50+/-0.05 mag and 0.48+/-0.05 mag for the cluster Haffner 11 and Czernik 31 respectively. Using 2MASS JHKs and optical data, we determined E(J-K) = 0.27+/-0.06 mag and E(V-K) = 1.37+/-0.06 for Haffner 11 and E(J-K) = 0.26+/-0.08 mag and E(V-K) = 1.32+/-0.08 mag for Czernik 31. Our analysis indicate normal interstellar extinction law in the direction of both the clusters. Distance of the clusters is determined as 5.8+/-0.5 Kpc for Haffner 11 and 3.2+/-0.3 Kpc for Czernik 31 by comparing the ZAMS with the CM diagram of the clusters. The age of the cluster has been estimated as 800+/-100 Myr for Haffner 11 and 160+/-40 Myr for Czernik 31 using the stellar isochrones of metallicity Z = 0.019.
description: 25 pages, 8 Figures, 5 Tables Accepted for the publication in New Astronomy
Bounding the greybody factors for the Reissner-Nordström black holes
Creators: name: Ngampitipan, Tritos
name: Boonserm, Petarpa
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A black hole can emit radiation called Hawking radiation. Such radiation seen by an observer outside the black hole differs from the original radiation near the horizon of the black hole by the so-called "greybody factor". In this paper, the bounds of the greybody factors for the Reissner-Nordström black holes are obtained. These bounds can be derived by using the 2 x 2 transfer matrices. It is found that the charges of black holes act as good barriers.
description: 6 pages, 4 figures, to appear in the proceedings of the ICAST 2012 --- International Conference on Advancement in Science and Technology (Kuantan, Malaysia)
Blue supergiant progenitor models of Type II supernovae
Creators: name: Vanbeveren, D.
name: Mennekens, N.
name: Van Rensbergen, W.
name: De Loore, C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In the present paper we show that within all the uncertainties that govern the process of Roche lobe overflow in Case Br type massive binaries, it can not be excluded that a significant fraction of them merge and become single stars. We demonstrate that at least some of them will spend most of their core helium burning phase as hydrogen rich blue stars, populating the massive blue supergiant region and/or the massive Be type star population. The evolutionary simulations let us suspect that these mergers will explode as luminous hydrogen rich stars and it is tempting to link them to at least some super luminous supernovae.
description: Accepted for publication in A&A; accepted version
Sur une classe de groupoides riemanniens
Creators: name: Popescu, Paul
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this work we show that there is a Riemannian groupoid whose orbits are the closures of the leaves of a regular Riemannian foliation on a compact manifold. This groupoid is equivalent (in a generalized sense of Haefliger) with a transformational groupoid on the basic manifold.
description: 13 pages, in french
An operational link between MUBs and SICs
Creators: name: Beneduci, Roberto
name: Bullock, Tom
name: Busch, Paul
name: Carmeli, Claudio
name: Heinosaari, Teiko
name: Toigo, Alessandro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We exhibit an operational connection between mutually unbiased bases and symmetric infomationally complete positive operator-valued measures. Assuming that the latter exists, we show that there is a strong link between these two structures in all prime power dimensions. We also demonstrate that a similar link cannot exists in dimension 6.
description: 17 pages, 2 figures
title: Ceiling and Visibility Analysis Products Assessment
Creators: name: Fenton, Kenneth R.
name: Mueller, Dana M.
name: Peevey, Tanya R.
name: Wandishin, Matthew S.
name: Petty, Melissa A.
Publisher: name: United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research.
Year: 2019

description: Technical Memorandum OAR GSD-64
Stationary reflection principles and two cardinal tree properties
Creators: name: Sakai, Hiroshi
name: Velickovic, Boban
Publisher: name: arXiv
Year: 2013
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics

description: We study consequences of stationary and semi-stationary set reflection. We show that the semi stationary reflection principle implies the Singular Cardinal Hypothesis, the failure of weak square principle, etc. We also consider two cardinal tree properties introduced recently by Weiss and prove that they follow from stationary and semi stationary set reflection augmented with a weak form of Martin's Axiom. We also show that there are some differences between the two reflection principles which suggest that stationary set reflection is analogous to supercompactness whereas semi-stationary set reflection is analogous to strong compactness.
description: 19 pages
Nuclear physics inputs for dense-matter modelling in neutron stars. The nuclear equation of state
Creators: name: Fantina, A. F.
name: Gulminelli, F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this contribution, we briefly present the equation-of-state modelling for application to neutron stars and discuss current constraints coming from nuclear physics theory and experiments. To assess the impact of model uncertainties, we employ a nucleonic meta-modelling approach and perform a Bayesian analysis to generate posterior distributions for the equation of state with filters accounting for both our present low-density nuclear physics knowledge and high-density neutron-star physics constraints. The global structure of neutron stars thus predicted is discussed in connection with recent astrophysical observations.
description: 6 pages, 4 figures. Contribution to the proceedings of the 28th International Nuclear Physics Conference (INPC 2022)
Surface waves in deformed Bell materials
Creators: name: Destrade, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Small amplitude inhomogeneous plane waves are studied as they propagate on the free surface of a predeformed semi-infinite body made of Bell constrained material. The predeformation corresponds to a finite static pure homogeneous strain. The surface wave propagates in a principal direction of strain and is attenuated in another principal direction, orthogonal to the free surface. For these waves, the secular equation giving the speed of propagation is established by the method of first integrals. This equation is not the same as the secular equation for incompressible half-spaces, even though the Bell constraint and the incompressibility constraint coincide in the isotropic infinitesimal limit.
On Titchmarsh-Weyl functions and eigenfunction expansions of first-order symmetric systems
Creators: name: Albeverio, Sergio
name: Malamud, Mark
name: Mogilevskii, Vadim
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 34B08, 34B20, 34B40, 34L10, 47A06, 47B25

description: We study general (not necessarily Hamiltonian) first-order symmetric systems $J y'(t)-B(t)y(t)=\D(t) f(t)$ on an interval $\cI=[a,b> $ with the regular endpoint $a$. It is assumed that the deficiency indices $n_\pm(\Tmi)$ of the minimal relation $\Tmi$ in $\LI$ satisfy $n_-(\Tmi)\leq n_+(\Tmi)$. By using a Nevanlinna boundary parameter $τ=τ(ł)$ at the singular endpoint $b$ we define self-adjoint and $ł$-depending Nevanlinna boundary conditions which are analogs of separated self-adjoint boundary conditions for Hamiltonian systems. With a boundary value problem involving such conditions we associate the $m$-function $m(\cd)$, which is an analog of the Titchmarsh-Weyl coefficient for the Hamiltonian system. By using $m$-function we obtain the Fourier transform $V:\LI\to L^2(\Si)$ with the spectral function $\Si(\cd)$ of the minimally possible dimension. If $V$ is an isometry, then the (exit space) self-adjoint extension $\wt T$ of $\Tmi$ induced by the boundary problem is unitarily equivalent to the multiplication operator in $L^2(\Si)$; hence the spectrum of $\wt T$ is defined by the spectral function $\Si(\cd)$. We show that all the objects of the boundary problem are determined by the parameter $τ$, which enables us to parametrize all spectral function $\Si(\cd) $ immediately in terms of $τ$. Similar results for various classes of boundary problems were obtained by Kac and Krein, Fulton, Hinton and Shaw and other authors.
Beta-delayed neutron and gamma-ray spectroscopy of 17C utilizing spin-polarized 17B
Creators: name: Ueno, H.
name: Miyatake, H.
name: Yamamoto, Y.
name: Tanimoto, S.
name: Shimoda, T.
name: Aoi, N.
name: Asahi, K.
name: Ideguchi, E.
name: Ishihara, M.
name: Izumi, H.
name: Kishida, T.
name: Kubo, T.
name: Mitsuoka, S.
name: Mizoi, Y.
name: Notani, M.
name: Ogawa, H.
name: Ozawa, A.
name: Sasaki, M.
name: Shirakura, T.
name: Takahashi, N.
name: Yoneda, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Excited states in 17C were investigated through the measurement of beta?-delayed neutrons and gamma rays emitted in the ? decay of 17B. In the measurement, three negative-parity states and two inconclusive states, were identified in 17C above the neutron threshold energy, and seven gamma-lines were identified in a beta?-delayed multiple neutron emission of the 17B ? decay. From these transitions, the beta?-decay scheme of 17B was determined. In the present work, the fibeta-NMR technique is combined with the ?-delayed particle measurements using a fragmentation-induced spin-polarized 17B beam. This new scheme allows us to determine the spin parity of beta?-decay feeding excited states based on the difference in the discrete fibeta-decay asymmetry parameters, provided the states are connected through the Gamow-Teller transition. In this work, 1/2-, 3/2-, and (5/2-) are assigned to the observed states at Ex = 2.71(2), 3.93(2), and 4.05(2) MeV in 17C, respectively.
Fat-free noncontrast whole-heart CMR with fast and power-optimized off-resonant water excitation pulses
Creators: name: Mackowiak, Adèle L. C.
name: Piccini, Davide
name: Bastiaansen, Jessica A. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Background: Cardiovascular MRI (CMR) faces challenges due to the interference of bright fat signals in visualizing anatomical structures. Effective fat suppression is crucial when using whole-heart CMR. Conventional methods often fall short due to rapid fat signal recovery and water-selective off-resonant pulses come with tradeoffs between scan time and RF energy deposit. A lipid-insensitive binomial off-resonant (LIBOR) RF pulse is introduced, addressing concerns about RF energy and scan time for CMR at 3T. Methods: A short LIBOR pulse was developed and implemented in a free-breathing respiratory self-navigated whole-heart sequence at 3T. A BORR pulse with matched duration, as well as previously used LIBRE pulses, were implemented and optimized for fat suppression in numerical simulations and validated in healthy subjects (n=3). Whole-heart CMR was performed in healthy subjects (n=5) with all four pulses. The SNR of ventricular blood, skeletal muscle, myocardium, and subcutaneous fat, and the coronary vessel sharpness and length were compared. Results: Experiments validated numerical findings and near homogeneous fat suppression was achieved with all pulses. Comparing the short pulses (1ms), LIBOR reduced the RF power two-fold compared with LIBRE, and three-fold compared with BORR, and LIBOR significantly decreased overall fat SNR. The reduction in RF duration shortened the whole-heart acquisition from 8.5min to 7min. No significant differences in coronary arteries detection and sharpness were found when comparing all four pulses. Conclusion: LIBOR enabled whole-heart CMR under 7 minutes at 3T, with large volume fat signal suppression, while reducing RF power compared with LIBRE and BORR. LIBOR is an excellent candidate to address SAR problems encountered in CMR where fat suppression remains challenging and short RF pulses are required.
description: 25 pages, 7 figures, 2 tables
Rayleigh waves in symmetry planes of crystals: explicit secular equations and some explicit wave speeds
Creators: name: Destrade, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Rayleigh waves are considered for crystals possessing at least one plane of symmetry. The secular equation is established explicitly for surface waves propagating in any direction of the plane of symmetry, using two different methods. This equation is a quartic for the squared wave speed in general, and a biquadratic for certain directions in certain crystals, where it may itself be solved explicitly. Examples of such materials and directions are found in the case of monoclinic crystals with the plane of symmetry at $x_3=0$. The cases of orthorhombic materials and of incompressible materials are also treated.