cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
QCD sum rules study of $QQ-\bar{u}\bar{d}$ mesons
Creators: name: Navarra, Fernando S.
name: Nielsen, Marina
name: Lee, Su Houng
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use QCD sum rules to study the possible existence of $QQ-\bar{u}\bar{d}$ mesons, assumed to be a state with $J^{P}=1^{+}$. For definiteness, we work with a current with an axial heavy diquark and a scalar light antidiquark, at leading order in $α_s$. We consider the contributions of condensates up to dimension eight. For the $b$-quark, we predict $M_{T_{bb}}= (10.2\pm 0.3) {\rm GeV}$, which is below the $\bar{B}\bar{B}^*$ threshold. For the $c$-quark, we predict $M_{T_{cc}}= (4.0\pm 0.2) {\rm GeV}$, in agreement with quark model predictions.
description: replaced version accepted for publication to Phys. Lett. B
A novel automatic film changer for high-speed analysis of nuclear emulsions
Creators: name: Borer, K.
name: Damet, J.
name: Hess, M.
name: Kreslo, I.
name: Moser, U.
name: Pretzl, K.
name: Savvinov, N.
name: Schuetz, H. -U.
name: Waelchli, T.
name: Weber, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: This paper describes the recent development of a novel automatic computer-controlled manipulator for emulsion film placement and removal at the microscope object table (also called stage). The manipulator is designed for mass scanning of emulsion films for the OPERA neutrino oscillation experiment and provides emulsion changing time shorter than 30 seconds with an emulsion film positioning accuracy as good as 20 microns RMS.
description: 11 pages, 12 figures, to be published in NIM A
Scale-free vortex cascade emerging from random forcing in a strongly coupled system
Creators: name: Rypdal, Kristoffer
name: Kozelov, Boris
name: Ratynskaia, Svetlana
name: Klumov, Boris
name: Knapek, Christina
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The notions of self-organised criticality (SOC) and turbulence are traditionally considered to be applicable to disjoint classes of phenomena. Nevertheless, scale-free burst statistics is a feature shared by turbulent as well as self-organised critical dynamics. It has also been suggested that another shared feature is universal non-gaussian probability density functions (PDFs) of global fluctuations. Here, we elucidate the unifying aspects through analysis of data from a laboratory dusty plasma monolayer. We compare analysis of experimental data with simulations of a two-dimensional (2D) many-body system, of 2D fluid turbulence, and a 2D SOC model, all subject to random forcing at small scales. The scale-free vortex cascade is apparent from structure functions as well as spatio-temporal avalanche analysis, the latter giving similar results for the experimental and all model systems studied. The experiment exhibits global fluctuation statistics consistent with a non-gaussian universal PDF, but the model systems yield this result only in a restricted range of forcing conditions.
Skeleton of Matrix-Product-State-Solvable Models Connecting Topological Phases of Matter
Creators: name: Jones, Nick G.
name: Bibo, Julian
name: Jobst, Bernhard
name: Pollmann, Frank
name: Smith, Adam
name: Verresen, Ruben
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Models whose ground states can be written as an exact matrix product state (MPS) provide valuable insights into phases of matter. While MPS-solvable models are typically studied as isolated points in a phase diagram, they can belong to a connected network of MPS-solvable models, which we call the MPS skeleton. As a case study where we can completely unearth this skeleton, we focus on the one-dimensional BDI class -- non-interacting spinless fermions with time-reversal symmetry. This class, labelled by a topological winding number, contains the Kitaev chain and is Jordan-Wigner-dual to various symmetry-breaking and symmetry-protected topological (SPT) spin chains. We show that one can read off from the Hamiltonian whether its ground state is an MPS: defining a polynomial whose coefficients are the Hamiltonian parameters, MPS-solvability corresponds to this polynomial being a perfect square. We provide an explicit construction of the ground state MPS, its bond dimension growing exponentially with the range of the Hamiltonian. This complete characterization of the MPS skeleton in parameter space has three significant consequences: (i) any two topologically distinct phases in this class admit a path of MPS-solvable models between them, including the phase transition which obeys an area law for its entanglement entropy; (ii) we illustrate that the subset of MPS-solvable models is dense in this class by constructing a sequence of MPS-solvable models which converge to the Kitaev chain (equivalently, the quantum Ising chain in a transverse field); (iii) a subset of these MPS states can be particularly efficiently processed on a noisy intermediate-scale quantum computer.
description: 21 pages + appendix
GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
Creators: name: Bevins, H. T. J.
name: Handley, W. J.
name: Fialkov, A.
name: Acedo, E. de Lera
name: Javid, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Emulation of the Global (sky-averaged) 21-cm signal with neural networks has been shown to be an essential tool for physical signal modelling. In this paper we present globalemu, a Global 21-cm signal emulator that uses redshift as a character defining variable alongside a set of astrophysical parameters to estimate the signal brightness temperature. Combined with physically-motivated data pre-processing this makes for a reliable and fast emulator that is relatively insensitive to the network design. globalemu can emulate a high resolution signal in 1.3 ms in comparison to 133 ms, a factor of 102 improvement, when using the existing public state of the art 21cmGEM. We illustrate, with the standard astrophysical models used to train 21cmGEM, that globalemu is almost twice as accurate and for a test set of $\approx1,700$ signals we achieve a mean RMSE of 2.52 mK across the band z=7-28 ($\approx$10 per cent the expected noise of the Radio Experiment for the Analysis of Cosmic Hydrogen (REACH)). The models are parameterised by the star formation efficiency, $f_*$, minimum virial circular velocity, $V_c$, X-ray efficiency, $f_X$, CMB optical depth, $τ$, the slope and low energy cut off of the X-ray spectral energy density, $α$ and $ν_\mathrm{min}$, and the mean free path of ionizing photons, $R_\mathrm{mfp}$. globalemu provides a flexible framework for easily emulating updated simulations of the Global signal and in addition the neutral fraction history. The emulator is pip installable and available at: \url{https://github.com/htjb/globalemu}. globalemu will be used extensively by the REACH collaboration.
description: 14 pages, 14 figures
Ricci curvature and quantum geometry
Creators: name: Carfora, Mauro
name: Familiari, Francesca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We describe a few elementary aspects of the circle of ideas associated with a quantum field theory (QFT) approach to Riemannian Geometry, a theme related to how Riemannian structures are generated out of the spectrum of (random or quantum) fluctuations around a background fiducial geometry. In such a scenario, Ricci curvature with its subtle connections to diffusion, optimal transport, Wasserestein geometry, and renormalization group, features prominently.
description: 11 pages
Cluster state preparation using gates operating at arbitrary success probabilities
Creators: name: Kieling, K.
name: Gross, D.
name: Eisert, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Several physical architectures allow for measurement-based quantum computing using sequential preparation of cluster states by means of probabilistic quantum gates. In such an approach, the order in which partial resources are combined to form the final cluster state turns out to be crucially important. We determine the influence of this classical decision process on the expected size of the final cluster. Extending earlier work, we consider different quantum gates operating at various probabilites of success. For finite resources, we employ a computer algebra system to obtain the provably optimal classical control strategy and derive symbolic results for the expected final size of the cluster. We identify two regimes: When the success probability of the elementary gates is high, the influence of the classical control strategy is found to be negligible. In that case, other figures of merit become more relevant. In contrast, for small probabilities of success, the choice of an appropriate strategy is crucial.
description: 7 pages, 9 figures, contribution to special issue of New J. Phys. on "Measurement-Based Quantum Information Processing". Replaced with published version
General analysis of the complementary nature of coercivity enhancement and exchange bias in ferro-antiferromagnet (F-AF) exchange coupled systems
Creators: name: Liu, Congxiao
name: Sun, Min
name: Fujiwara, Hideo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Complementary nature of coercivity enhancement and exchange bias is generalized from the layered systems to ferro-antiferromagnet (F-AF) exchange coupled systems with arbitrary configurations and is proved based on the coherent rotation of the F magnetization. In the proof, the effect of F-AF coupling is absorbed into the anisotropy of the F part, resulting in an arbitrary anisotropy for the F part. The proof starts from a general discussion on the initial susceptibility of a single domain particle. Then the fundamental correlation between the maximal initial susceptibility and the critical field along an arbitrary easy direction of a single domain particle, at which the magnetization becomes unstable, is discussed. Finally, the difference of the initial switching field and the actual switching field along the arbitrarily chosen easy direction is discussed.
description: 32 pages, 4 figures
A strategic capacity planning tool for a firm in the newsprint industry
Creators: name: Booth, Darcie Lee
Publisher: name: University of British Columbia
Year: 2011

description: A strategic planning tool has been developed to help a firm in the North American newsprint industry decide whether to expand its capacity. This tool can also be used as an industry model, to forecast capacity decisions under various conditions. Key features of the model are the explicit consideration of the interdependence between firms and the recognition of the lumpiness of capacity expansion. Individual firms and groups of firms are modelled. All firms are assumed to determine their best capacity option taking into consideration the capacity decisions of other firms. The model uses an open loop Nash equilibrium concept to solve the capacity expansion problem. Firms also simultaneously determine their profit-maximizing production in each year, given their capacities. Demand functions for each year are specified, and demand scenarios may be subject to uncertainty. The model was applied to the newsprint industry for the 1979 to 1983 time period. The top five firms in the industry were modelled as individual firms. The next eight firms were modelled as two groups of four identical firms. The behaviour of the fringe (i.e., the remaining 20% of total industry capacity) was forecast exogenously. Historical firm and industry capacities, production levels and prices were compared to model simulations under three different assumptions for firm objectives: profit maximization, market share maximization subject to a profitability constraint, and maximization of expected utility assuming exponential utility functions for all firms (with different assumptions about attitudes of firms towards risk). The constrained market share maximization hypothesis best explained observed behaviour. Multiple equilibria were often computed and methods for addressing this problem were discussed.
title: Visita de estudo : obra de remate do Palácio Nacional da Ajuda
Creators: name: Santos, José Carlos dos
Publisher: name: As fórmulas na arquitectura
Year: 2020

description: As fórmulas na arquitectura / 4.º Seminário Internacional de Arquitectura e Matemática ; coordenação de Fátima Silva, Elsa Negas, Rui Seco. - Lisboa : Universidade Lusíada, 2020. - P. 265-266.
Quarkonium and hydrogen spectra with spin dependent relativistic wave equation
Creators: name: Zaveri, Vikram H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A non-linear non-perturbative relativistic atomic theory introduces spin in the dynamics of particle motion. The resulting energy levels of Hydrogen atom are exactly same as the Dirac theory. The theory accounts for the energy due to spin-orbit interaction and for the additional potential energy due to spin and spin-orbit coupling. Spin angular momentum operator is integrated into the equation of motion. This requires modification to classical Laplacian operator. Consequently the Dirac matrices and the k operator of Dirac's theory are dispensed with. The theory points out that the curvature of the orbit draws on certain amount of kinetic and potential energies affecting the momentum of electron and the spin-orbit interaction energy constitutes a part of this energy. The theory is developed for spin 1/2 bound state single electron in Coulomb potential and then further extended to quarkonium physics by introducing the linear confining potential. The unique feature of this quarkonium model is that the radial distance can be exactly determined and does not have a statistical interpretation. The established radial distance is then used to determine the wave function. The observed energy levels are used as the input parameters and the radial distance and the string tension are predicted. This ensures 100% conformance to all observed energy levels for the heavy quarkonium.
description: 14 pages, v7: Journal reference added
A Generalization of the One-Dimensional Boson-Fermion Duality Through the Path-Integral Formalism
Creators: name: Ohya, Satoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study boson-fermion dualities in one-dimensional many-body problems of identical particles interacting only through two-body contacts. By using the path-integral formalism as well as the configuration-space approach to indistinguishable particles, we find a generalization of the boson-fermion duality between the Lieb-Liniger model and the Cheon-Shigehara model. We present an explicit construction of $n$-boson and $n$-fermion models which are dual to each other and characterized by $n-1$ distinct (coordinate-dependent) coupling constants. These models enjoy the spectral equivalence, the boson-fermion mapping, and the strong-weak duality. We also discuss a scale-invariant generalization of the boson-fermion duality.
description: 19 pages, 9 eepic figures; typos corrected, references added, discussion section expanded
No Sub-Saturn Mass Planet Desert in the CORALIE/HARPS Radial Velocity Sample
Creators: name: Bennett, David P.
name: Ranc, Clément
name: Fernandes, Rachel B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We analyze the CORALIE/HARPS sample of exoplanets (Mayor et al. 2011) found by the Doppler radial velocity method for signs of the predicted "desert" at 10-$100 M_\odot$ caused by runaway gas accretion at semimajor axes of $< 3\,$AU. We find that these data are not consistent with this prediction. This result is similar to the finding by the MOA gravitational microlensing survey that found no desert in the exoplanet distribution for exoplanets in slightly longer period orbits and somewhat lower host masses (Suzuki et al. 2018). Together, these results imply that the runaway accretion scenario of the core accretion theory does not have a large influence on the final mass and semimajor axis distribution of exoplanets.
description: accepted by the Astronomical Journal, 19 pages with 5 figures
The sweeping rate in diffusion-mediated reactions on dust grain surfaces
Creators: name: Lohmar, Ingo
name: Krug, Joachim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A prominent chemical reaction in interstellar clouds is the formation of molecular hydrogen by recombination, which essentially takes place on dust grain surfaces. Analytical approaches to model such a system have hitherto neglected the spatial aspects of the problem by employing a simplistic version of the sweeping rate of reactants. We show how these aspects can be accounted for by a consistent definition of the sweeping rate, and calculate it exactly for a spherical grain. Two regimes can be identified: Small grains, on which two reactants almost surely meet, and large grains, where this is very unlikely. We compare the true sweeping rate to the conventional approximation and find a characteristic reduction in both regimes, most pronounced for large grains. These effects can be understood heuristically using known results from the analysis of two-dimensional random walks. We finally examine the influence of using the true sweeping rate in the calculation of the efficiency of hydrogen recombination: For fixed temperature, the efficiency can be reduced considerably, and relative to that, small grains gain in importance, but the temperature window in which recombination is efficient is not changed substantially.
description: 10 pages, 6 figures
Coexistence of Dirac fermion and charge density wave in square-net-based semimetal LaAuSb2
Creators: name: Wu, Xueliang
name: Hu, Zhixiang
name: Graf, David
name: Liu, Yu
name: Deng, Chaoyue
name: Fu, Huixia
name: Kundu, Asish K.
name: Valla, Tonica
name: Petrovic, Cedomir
name: Wang, Aifeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a comprehensive study of magnetotransport properties, angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations on self-flux grown LaAuSb$_2$ single crystals. Resistivity and Hall measurements reveal a charge density wave (CDW) transition at 77 K. MR and de Haas-Van Alphen (dHvA) measurements indicate that the transport properties of LaAuSb$_2$ are dominated by Dirac fermions that arise from Sb square nets. ARPES measurements and DFT calculations reveal an electronic structure with a common feature of the square-net-based topological semimetals, which is in good agreement with the magnetotransport properties. Our results indicate the coexistence of CDW and Dirac fermion in LaAuSb$_2$, both of which are linked to the bands arising from the Sb-square net, suggesting that the square net could serve as a structural motif to explore various electronic orders.
description: 11 pages, 6 figures
Pairing and superconductivity in quasi one-dimensional flat band systems: Creutz and sawtooth lattices
Creators: name: Chan, Si Min
name: Grémaud, B.
name: Batrouni, G. G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the pairing and superconducting properties of the attractive Hubbard model in two quasi one-dimensional topological lattices: the Creutz and sawtooth lattices. They share two peculiar properties: each of their band structures exhibits a flat band with a non-trivial winding number. The difference, however, is that only the Creutz lattice is genuinely topological, owing to a chiral (sub-lattice) symmetry, resulting in a quantized winding number and zero energy edge modes for open boundary conditions. We use mean field and exact density matrix renormalization group in our work. Our three main results are: (a) For both lattice systems, the superconducting weight, $D_s$, is linear in the coupling strength, $U$, for low values of $U$; (b) for small $U$, $D_s$ is proportional to the quantum metric for the Creutz system but not for the sawtooth system because its sublattices are not equivalent; (c) conventional BCS mean field is not appropriate for such systems with inequivalent sublattices. We show that, for a wide range of densities and coupling strengths, these systems are very well described by a full multi-band mean field method where the pairing parameters and the local particle densities on the inequivalent sublattices are variational mean field parameters.
Study of Z bosons plus jets events using variables sensitive to double-parton scattering in pp collisions at 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Double-parton scattering is investigated using events with a Z boson and jets. The Z boson is reconstructed using only the dimuon channel. The measurements are performed with proton-proton collision data recorded by the CMS experiment at the LHC at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$ collected in the year 2016. Differential cross sections of Z + $\geq$ 1 jet and Z + $\geq$ 2 jets are measured with transverse momentum of the jets above 20 GeV and pseudorapidity $|η|$ $\lt$ 2.4. Several distributions with sensitivity to double-parton scattering effects are measured as functions of the angle and the transverse momentum imbalance between the Z boson and the jets. The measured distributions are compared with predictions from several event generators with different hadronization models and different parameter settings for multiparton interactions. The measured distributions show a dependence on the hadronization and multiparton interaction simulation parameters, and are important input for future improvements of the simulations.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-20-009 (CMS Public Pages)
Black Hole Spin Evolution: Implications for Short-hard Gamma Ray Bursts and Gravitational Wave Detection
Creators: name: Belczynski, Krzysztof
name: Taam, Ronald E.
name: Rantsiou, Emmanouela
name: van der Sluys, Marc
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The evolution of the spin and tilt of black holes in compact black hole - neutron star and black hole - black hole binary systems is investigated within the framework of the coalescing compact star binary model for short gamma ray bursts via the population synthesis method. Based on recent results on accretion at super critical rates in slim disk models, estimates of natal kicks, and the results regarding fallback in supernova models, we obtain the black hole spin and misalignment. It is found that the spin parameter, a_spin}, is less than 0.5 for initially non rotating black holes and the tilt angle, i_tilt, is less than 45 deg for 50% of the systems in black hole - neutron star binaries. Upon comparison with the results of black hole - neutron star merger calculations we estimate that only a small fraction (~ 0.01) of these systems can lead to the formation of a torus surrounding the coalesced binary potentially producing a short-hard gamma ray burst. On the other hand, for high initial black hole spin parameters (a_spin>0.6) this fraction can be significant (~ 0.4). It is found that the predicted gravitational radiation signal for our simulated population does not significantly differ from that for non rotating black holes. Due to the (i) insensitivity of signal detection techniques to the black hole spin and the (ii) predicted overall low contribution of black hole binaries to the signal we find that the detection of gravitational waves are not greatly inhibited by current searches with non spinning templates. It is pointed out that the detection of a black hole - black hole binary inspiral system with LIGO or VIRGO may provide a direct measurement of the initial spin of a black hole.
description: ApJ accepted: major revisions
Dressed excitonic states and quantum interference in a three-level quantum dot ladder system
Creators: name: Gerardot, B. D.
name: Brunner, D.
name: Dalgarno, P. A.
name: Karrai, K.
name: Badolato, A.
name: Petroff, P. M.
name: Warburton, R. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We observe dressed states and quantum interference effects in a strongly driven three-level quantum dot ladder system. The effect of a strong coupling field on one dipole transition is measured by a weak probe field on the second dipole transition using differential reflection. When the coupling energy is much larger than both the homoge-neous and inhomogeneous linewidths an Autler-Townes splitting is observed. Striking differences are observed when the transitions resonant with the strong and weak fields are swapped, particularly when the coupling energy is nearly equal to the measured linewidth. This result is attributed to quantum interference: a modest destructive or constructive interference is observed depending on the pump / probe geometry. The data demonstrate that coher-ence of both the bi-exciton and the exciton is maintained in this solid-state system, even under intense illumina-tion, which is crucial for prospects in quantum information processing and non-linear optical devices.
description: 8 pages, 6 figures, submitted to New Journal of Physics
On 𝛼-Firmly Nonexpansive Operators in r-Uniformly Convex Spaces
Creators: name: Bërdëllima, Arian
name: Steidl, Gabriele
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 510 Mathematik
subject: averaged operators
subject: Banach spaces
subject: contractive projections
subject: firmly nonexpansive operators
subject: fixed point theory
subject: uniformly convex spaces

description: We introduce the class of 𝛼-firmly nonexpansive and quasi 𝛼-firmly nonexpansive operators on r-uniformly convex Banach spaces. This extends the existing notion from Hilbert spaces, where 𝛼-firmly nonexpansive operators coincide with so-called 𝛼-averaged operators. For our more general setting, we show that 𝛼-averaged operators form a subset of 𝛼-firmly nonexpansive operators. We develop some basic calculus rules for (quasi) 𝛼-firmly nonexpansive operators. In particular, we show that their compositions and convex combinations are again (quasi) 𝛼-firmly nonexpansive. Moreover, we will see that quasi 𝛼-firmly nonexpansive operators enjoy the asymptotic regularity property. Then, based on Browder’s demiclosedness principle, we prove for r-uniformly convex Banach spaces that the weak cluster points of the iterates 𝑥𝑛+1:=𝑇𝑥𝑛 belong to the fixed point set Fix𝑇 whenever the operator T is nonexpansive and quasi 𝛼-firmly. If additionally the space has a Fréchet differentiable norm or satisfies Opial’s property, then these iterates converge weakly to some element in Fix𝑇. Further, the projections 𝑃Fix𝑇𝑥𝑛 converge strongly to this weak limit point. Finally, we give three illustrative examples, where our theory can be applied, namely from infinite dimensional neural networks, semigroup theory, and contractive projections in 𝐿𝑝, 𝑝∈(1,∞)∖{2} spaces on probability measure spaces.
EEG beta-modulations reflect age-specific motor resource allocation during dual-task walking
Creators: name: Protzak, Janna
name: Gramann, Klaus
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 150 Psychologie
subject: cognitive ageing
subject: cognitive neuroscience
subject: motor control
subject: sensorimotor processing

description: The parallel execution of two motor tasks can lead to performance decrements in either one or both of the tasks. Age-related declines can further magnify the underlying competition for cognitive resources. However, little is known about the neural dynamics underlying motor resource allocation during dual-task walking. To better understand motor resource conflicts, this study investigated sensorimotor brain rhythms in younger and older adults using a dual-task protocol. Time-frequency data from two independent component motor clusters were extracted from electroencephalography data during sitting and walking with an additional task requiring manual responses. Button press-related desynchronization in the alpha and beta frequency range were analyzed for the impact of age (
ความสามารถด้านการฟัง-การพูดภาษาอังกฤษและเจตคติต่อการเรียนภาษาอังกฤษของนักเรียนชั้นมัธยมศึกษาปีที่ 1 โรงเรียนหัวหิน ด้วยวิธีสอนกิจกรรมสถานการณ์จำลองโดยการออกแบบการเรียนรู้แบบย้อนกลับ
Creators: name: กาญจนา ชอบกลาง
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: การฟัง-การพูดภาษาอังกฤษ, เจตคติ, กิจกรรมสถานการณ์จำลอง, การออกแบบการเรียนรู้แบบย้อนกลับ

description: ฉบับพิเศษ, วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยมหาสารคาม
Pilot investigation on the dose-dependent impact of irradiation on primary human alveolar osteoblasts in vitro
Creators: name: Amler, Anna-Klara
name: Schlauch, Domenic
name: Tüzüner, Selin
name: Thomas, Alexander
name: Neckel, Norbert
name: Tinhofer, Ingeborg
name: Heiland, Max
name: Lauster, Roland
name: Kloke, Lutz
name: Stromberger, Carmen
name: Nahles, Susanne
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 610 Medizin und Gesundheit
subject: head and neck cancer
subject: preclinical research
subject: irradiation
subject: patient care

description: Radiotherapy of head and neck squamous cell carcinoma can lead to long-term complications like osteoradionecrosis, resulting in severe impairment of the jawbone. Current standard procedures require a 6-month wait after irradiation before dental reconstruction can begin. A comprehensive characterization of the irradiation-induced molecular and functional changes in bone cells could allow the development of novel strategies for an earlier successful dental reconstruction in patients treated by radiotherapy. The impact of ionizing radiation on the bone-forming alveolar osteoblasts remains however elusive, as previous studies have relied on animal-based models and fetal or animal-derived cell lines. This study presents the first in vitro data obtained from primary human alveolar osteoblasts. Primary human alveolar osteoblasts were isolated from healthy donors and expanded. After X-ray irradiation with 2, 6 and 10 Gy, cells were cultivated under osteogenic conditions and analyzed regarding their proliferation, mineralization, and expression of marker genes and proteins. Proliferation of osteoblasts decreased in a dose-dependent manner. While cells recovered from irradiation with 2 Gy, application of 6 and 10 Gy doses not only led to a permanent impairment of proliferation, but also resulted in altered cell morphology and a disturbed structure of the extracellular matrix as demonstrated by immunostaining of collagen I and fibronectin. Following irradiation with any of the examined doses, a decrease of marker gene expression levels was observed for most of the investigated genes, revealing interindividual differences. Primary human alveolar osteoblasts presented a considerably changed phenotype after irradiation, depending on the dose administered. Mechanisms for these findings need to be further investigated. This could facilitate improved patient care by re-evaluating current standard procedures and investigating faster and safer reconstruction concepts, thus improving quality of life and social integrity.
Squaring the circle: Business model teaching in large classroom settings
Creators: name: Szopinski, Daniel
Publisher: name: Journal of Business Models
Year: 2019

description: Daniel Szopinski is a PhD candidate with a Master’s degree in Management Information Systems. He is research and teaching assistant at the chair of Business Information Systems, esp. Digital Markets at Paderborn University. His research focuses on business model innovation, modeling languages for business models and software tools for business model development. From a methodological point of view he focuses on controlled experiments and participatory observations.
description: Journal of Business Models, Vol 7 No 3 (2019): Special Issue: Teaching Business Models - Part 1
Measurements of the pp $\to$ W$^\pmγγ$ and pp $\to$ Z$γγ$ cross sections at $\sqrt{s} =$ 13 TeV and limits on anomalous quartic gauge couplings
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb$^{-1}$ collected by the CMS experiment at the LHC. The W $\to$ $\ellν$ and Z $\to$ $\ell\ell$ decay modes (where $\ell =$ e, $μ$) are used to extract the W$γγ$ and Z$γγ$ cross sections in a phase space defined by electron (muon) with transverse momentum larger than 30 GeV and photon transverse momentum larger than 20 GeV. All leptons and photons are required to have absolute pseudorapidity smaller than 2.5. The measured cross sections in this phase space are $σ$(W$γγ$) = 13.6 $^{+1.9}_{-1.9}$ (stat) ${}^{+4.0}_{-4.0}$ (syst) $\pm$ 0.08 (PDF + scale) fb and $σ$(Z$γγ$) = 5.41 $^{+0.58}_{-0.55}$ (stat) ${}^{+0.64}_{-0.70}$ (syst) $\pm$ 0.06 (PDF + scale) fb. Limits on anomalous quartic gauge couplings are set in the framework of an effective field theory with dimension-8 operators.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-19-013 (CMS Public Pages)
Filtered Hirsch Algebras
Creators: name: Saneblidze, Samson
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55P35, 55S30, 55S05, 55U20

description: Motivated by the cohomology theory of loop spaces, we consider a special class of higher order homotopy commutative differential graded algebras and construct the filtered Hirsch model for such an algebra $A$. When $x\in H(A)$ with $\mathbb{Z}$ coefficients and $x^{2}=0,$ the symmetric Massey products $% \langle x\rangle ^{n}$ with $n\geq 3$ have a finite order (whenever defined). However, if $\Bbbk $ is a field of characteristic zero, $\langle x\rangle ^{n}$ is defined and vanishes in $H(A\otimes \Bbbk )$ for all $n$. If $p$ is an odd prime, the Kraines formula $\langle x\rangle ^{p}=-β\mathcal{P}_{1}(x)$ lifts to $H^{\ast }(A\otimes {\mathbb{Z}}_{p}).$ Applications of the existence of polynomial generators in the loop homology and the Hochschild cohomology with a $G$-algebra structure are given.
description: 29 pages, 2 figures, revised the definition of a Hirsch resolution, corrected typos
Numerical radius and zero pattern of matrices
Creators: name: Nikiforov, Vladimir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 15A60

description: We give tight upper bounds on the numerical range of square matrices in terms of their Frobenius (Euclidian) norm and a combinatorial parameter similar to the clique number of graphs. Our results imply a concise form of the fundamental theorem of Turan in extremal graph theory.
Embedding and knotting of manifolds in Euclidean spaces
Creators: name: Skopenkov, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 57--02, 57R40, 57Q35

description: A clear understanding of topology of higher-dimensional objects is important in many branches of both pure and applied mathematics. In this survey we attempt to present some results of higher-dimensional topology in a way which makes clear the visual and intuitive part of the constructions and the arguments. In particular, we show how abstract algebraic constructions appear naturally in the study of geometric problems. Before giving a general construction, we illustrate the main ideas in simple but important particular cases, in which the essence is not veiled by technicalities. More specifically, we present several classical and modern results on the embedding and knotting of manifolds in Euclidean space. We state many concrete results (in particular, recent explicit classification of knotted tori). Their statements (but not proofs!) are simple and accessible to non-specialists. We outline a general approach to embeddings via the classical van Kampen-Shapiro-Wu-Haefliger-Weber 'deleted product' obstruction. This approach reduces the isotopy classification of embeddings to the homotopy classification of equivariant maps, and so implies the above concrete results. We describe the revival of interest in this beautiful branch of topology, by presenting new results in this area (of Freedman, Krushkal, Teichner, Segal, Spiez and the author): a generalization the Haefliger-Weber embedding theorem below the metastable dimension range and examples showing that other analogues of this theorem are false outside the metastable dimension range.
description: 70 pages; to appear in London Mathematical Society Lecture Notes
Fast automated scanning of OPERA emulsion films
Creators: name: Sirri, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The use of nuclear emulsions to record tracks of charged particles with an accuracy of better than 1 micron is possible in large physics experiments thanks to the recent improvements in the industrial production of emulsions and to the development of fast automated microscopes. The European Scanning System (ESS) is a fast automatic system developed for the mass scanning of the emulsions of the OPERA experiment, which requires microscopes with scanning speeds of about 20 cm$^2$/h. Recent improvements in the technique and measurements with ESS are reported.
description: 3 pages, 5 figures, presented at the 10th Topical Seminar on Innovative Particle and Radiation Detectors, 1-5 October 2006, Siena, Italy
Validação preliminar de face da escala pictórica da competência aquática percebida
Creators: name: Morgado, Liliane S.
name: Jidovtseff, Boris
name: Sääkslahti, Arja
name: Howells, Kristy
name: Barnett, Lisa
name: De Martelaer, Kristine
name: D'Hondt, Eva
name: Costa, Aldo M.
Publisher: name: Motricidade
Year: 2021

description: Apenas uma investigação se interessou pelo desenvolvimento de uma escala pictórica que avalia a competência aquática percebida em crianças (1). Esta ferramenta possui um número limitado de skills aquáticos (i.e. 6 skills) e visa apenas crianças entre os 4 e os 5 anos. Portanto, o desenvolvimento de uma ferramenta mais completa e apropriada para crianças dos 4 aos 8 anos revela ser pertinente. Assim, um grupo de investigadores decidiu desenvolver essa nova ferramenta intitulada Escala Pictórica da Competência Aquática Percebida (EPCAP) (2). Foi objetivo deste estudo realizar a validação preliminar de face da EPCAP em crianças com idades entre os 4 e os 8 anos. 50 crianças Belgas (meninas n=25) dos 4 aos 8 anos de idade (6.1±1.4 anos) participaram no estudo. As crianças foram entrevistadas individualmente para avaliar a compreensão de 17 situações aquáticas que compõem o instrumento desenvolvido (2). A entrevista incluiu 4 questões de compreensão global sobre cada situação aquática composta respectivamente por uma sequência de progressão com 3 imagens. A maioria das crianças identificou corretamente as situações (82%) e conseguiu sequenciar as 3 imagens correspondentes (91%). Os resultados mostraram um aumento da compreensão em função da idade (4 anos, 50%; 5 anos, 73%; 6 anos, 83%; 7 anos, 89%; e 8 anos, 96%). A descrição das imagens por parte das crianças permitiu evidenciar os elementos que conduziam à incompreensão da situação ou à dificuldade na sua sequência - situações 5 e 6 (flutuar); situação 12 (mergulho de cabeça); a situação 16 (saída da água) e as situações 15, 16 e 17 (mudanças de direção). Os resultados sugerem que a compreensão da atual versão da EPCAP é satisfatória a partir dos 5 anos. As imagens das situações aquáticas que geraram incompreensão e/ou dificuldade na sequência de progressão foram propostas para revisão em conformidade, sendo recomendado proceder à validação de face da futura versão da EPCAP.
description: Motricidade, Vol. 17 No. S1 (2021): Proceedings of the XLIII Technical and Scientific Congress of the Portuguese Association of Swimming Technicians
The traveling wave MRI in cylindrical Taylor-Couette flow: comparing wavelengths and speeds in theory and experiment
Creators: name: Ruediger, Guenther
name: Hollerbach, Rainer
name: Stefani, Frank
name: Gundrum, Thomas
name: Gerbeth, Gunter
name: Rosner, Robert
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study experimentally the flow of a liquid metal confined between differentially rotating cylinders, in the presence of externally imposed axial and azimuthal magnetic fields. For increasingly large azimuthal fields a wave-like disturbance arises, traveling along the axis of the cylinders. The wavelengths and speeds of these structures, as well as the field strengths and rotation rates at which they arise, are broadly consistent with theoretical predictions of such a traveling wave magnetorotational instability.
description: 5 pages, 3 figures, accepted by ApJ
The square negative correlation property for generalized Orlicz balls
Creators: name: Wojtaszczyk, Jakub Onufry
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 52A20, 60D05

description: Antilla, Ball and Perissinaki proved that the squares of coordinate functions in $\ell_p^n$ are negatively correlated. This paper extends their results to balls in generalized Orlicz norms on R^n. From this, the concentration of the Euclidean norm and a form of the Central Limit Theorem for the generalized Orlicz balls is deduced. Also, a counterexample for the square negative correlation hypothesis for 1-symmetric bodies is given. Currently the CLT is known in full generality for convex bodies (see the paper "Power-law estimates for the central limit theorem for convex sets" by B. Klartag), while for generalized Orlicz balls a much more general result is true (see "The negative association property for the absolute values of random variables equidistributed on a generalized Orlicz ball" by M. Pilipczuk and J. O. Wojtaszczyk). While, however, both aforementioned papers are rather long, complicated and technical, this paper gives a simple and elementary proof of, eg., the Euclidean concentration for generalized Orlicz balls.
description: 10 pages
A machine learning model to classify dynamic processes in liquid water
Creators: name: Huang, Jie
name: Huang, Gang
name: Li, Shiben
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The dynamics of water molecules plays a vital role in understanding water. We combined computer simulation and deep learning to study the dynamics of H-bonds between water molecules. Based on ab initio molecular dynamics simulations and a newly defined directed Hydrogen (H-) bond population operator, we studied a typical dynamic process in bulk water: interchange, in which the H-bond donor reverses roles with the acceptor. By designing a recurrent neural network-based model, we have successfully classified the interchange and breakage processes in water. We have found that the ratio between them is approximately 1:4, and it hardly depends on temperatures from 280 to 360 K. This work implies that deep learning has the great potential to help distinguish complex dynamic processes containing H-bonds in other systems.
description: 8 pages, 8 figures, Support Information https://nbviewer.org/github/HuangJiaLian/DataBase0/blob/master/uPic/2021_08_14_09_SI.pdf ; SI Appendix Video 1 (DA exchange) https://nbviewer.org/github/HuangJiaLian/DataBase0/blob/master/uPic/2021_04_19_19_DA1_09_14.gif ; SI Appendix Video 2 (Diffusion) https://nbviewer.org/github/HuangJiaLian/DataBase0/blob/master/uPic/2021_04_19_19_DF2_23_35.gif
รูปแบบการจัดการน้ำเพื่อการเกษตรอย่างมีส่วนร่วมของชุมชนบ้านลาด ตำบลหลักเมือง อำเภอกมลาไสย จังหวัดกาฬสินธุ์
Creators: name: อภิญญา อันพันลา
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: นิเวศโคก, นิเวศทุ่ง, นิเวศทาม, ทุ่งนาทอง, สนม, น้ำซับ, ลำหลอด, ลำลาง, สักหล่ง

description: ฉบับพิเศษ, วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยมหาสารคาม
แนวทางการแก้ไขปัญหาน้ำท่วมซ้ำซากและการขาดแคลนน้ำในฤดูแล้งโดยกระบวนการมีส่วนร่วมของชุมชน องค์กรท้องถิ่น และหน่วยงานที่เกี่ยวข้อง กรณีศึกษา ตำบลโพนงาม อำเภอกมลาไสย จังหวัดกาฬสินธุ์
Creators: name: นุจรี ใจประนบ
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: กระบวนการมีส่วนร่วม, การจัดการน้ำ, ศักยภาพ, ภูมิปัญญาท้องถิ่น

description: ฉบับพิเศษ, วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยมหาสารคาม