cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Iterated binomial transform of the k-Lucas sequence
Creators: name: Yilmaz, Nazmiye
name: Taskara, Necati
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this study, we apply "r" times the binomial transform to k-Lucas sequence. Also, the Binet formula, summation, generating function of this transform are found using recurrence relation. Finally, we give the properties of iterated binomial transform with classical Lucas sequence.
Spectroscopic factors from direct proton capture
Creators: name: Iliadis, C.
name: Wiescher, M.
Publisher: name: American Physical Society
Year: 2004

description: Spectroscopic factors derived from direct capture studies are systematically compared to those obtained from transfer reaction experiments and from shell model calculations for the A= 16-32 target mass region. The direct proton capture and proton transfer spectroscopic factors are obtained in the present work from a reanalysis of literature data by using the same bound state potential parameters. Our direct capture spectroscopic factors differ significantly from the values originally reported in the literature. The sensitivity of the direct capture cross section to different choices for the scattering potential is explored. We find evidence that spectroscopic factors obtained from direct capture studies are as reliable as those extracted from transfer measurements if the (direct capture) radial scattering wave function is calculated with a zero nuclear scattering potential instead of the common choice of a hard-sphere potential.
Wavefronts and Light Cones for Kerr Spacetimes
Creators: name: Frutos-Alfaro, Francisco
name: Grave, Frank
name: Mueller, Thomas
name: Adis, Daria
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the light propagation by means of simulations of wavefronts and light cones for Kerr spacetimes. Simulations of this kind give us a new insight to better understand the light propagation in presence of massive rotating black holes. A relevant result is that wavefronts are back scattered with winding around the black hole. To generate these visualizations, an interactive computer program with a graphical user interface, called JWFront, was written in Java.
β-delayed particle decay of 17ne into p + α + 12C through the isobaric analog state in 17F
Creators: name: Boyd, R.N.
name: Giesen, U.
name: D'Auria, J.M.
name: Buchmann, L.
name: Jackson, K.P.
name: Shorter, A.
name: Davinson, T.
name: Iliadis, C.
name: Morton, A.C.
name: Powell, J.
name: Chow, J.C.
name: King, J.D.
name: Dombsky, M.
name: Bateman, N.P.T.
name: Gete, E.
Publisher: name: American Physical Society
Year: 2002

description: We have observed the breakup of the isobaric analog state at 11.193 MeV in 17F into three particles via three channels: proton decay to the α-unbound 9.585 MeV state in 16O; and α decay to the proton-unbound 2.365 and 3.502/3.547 MeV states in 13N. Laboratory α-particle spectra corresponding to these three modes have been generated in Monte Carlo simulations using single-channel, single- and multilevel R-matrix formulas. A fit of these spectra to the α spectrum resulting from a triple-coincidence measurement results in excellent agreement with the experimental spectrum and allows branching ratios to be deduced for these rare decay modes.
Measurement of the 24Mg(p,t) 22Mg reaction and implications for the 21Na(p, γ) 22Mg stellar reaction rate
Creators: name: Kurokawa, M.
name: Abe, K.
name: Fuchi, Y.
name: Iliadis, C.
name: Kubono, S.
name: Chow, J., University of Toronto, Toronto, Ont. M5S 1A7, Canada
name: Bateman, N.
name: Strasser, P.
name: Ishiyama, H.
name: Jackson, K.P.
name: D'Auria, J.M.
name: Karataglidis, S.
name: Kato, S.
name: Ball, G.
name: Buchmann, L.
name: Liu, X.
name: Michimasa, S.
name: Tanaka, M.H.
name: Kumagai, K.
Publisher: name: American Physical Society
Year: 2001

description: Levels in 22Mg between 4 and 7 MeV excitation energy have been populated in a high-resolution study of the 24Mg(p,t) 22Mg reaction. Two new states have been observed at energies Ex = 5090 and 6323 keV, while two states were observed at 5962 and 6046 keV. The precision in measured excitation energies for several other 22Mg levels has been improved substantially. In addition, a new state at 8141 keV was observed in 23Mg. Using spin and parity restrictions from the present and previous work, we discuss T = 1 analog state assignments of A = 22 nuclei below 7 MeV excitation energy. The implications for the rate of the stellar reaction 21Na(p, γ) 22Mg which takes part in hydrogen burning during nova outbursts are presented.
CSI 2264: Probing the inner disks of AA Tau-like systems in NGC 2264
Creators: name: McGinnis, Pauline T.
name: Alencar, Silvia H. P.
name: Guimaraes, Marcelo M.
name: Sousa, Alana P.
name: Stauffer, John
name: Bouvier, Jerome
name: Rebull, Luisa
name: Fonseca, Nathalia N. J.
name: Venuti, Laura
name: Hillenbrand, Lynne
name: Cody, Ann Marie
name: Teixeira, Paula S.
name: Aigrain, Suzanne
name: Favata, Fabio
name: Furesz, Gabor
name: Vrba, Frederick J.
name: Flaccomio, Ettore
name: Turner, Neal J.
name: Gameiro, Jorge Filipe
name: Dougados, Catherine
name: Herbst, William
name: Morales-Calderon, Maria
name: Micela, Giusi
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The classical T Tauri star AA Tau presented photometric variability attributed to an inner disk warp, caused by the interaction between the inner disk and an inclined magnetosphere. Previous studies of NGC 2264 have shown that similar photometric behavior is common among CTTS. The goal of this work is to investigate the main causes of the observed photometric variability of CTTS in NGC 2264 that present AA Tau-like light curves, and verify if an inner disk warp could be responsible for their variability. We investigate veiling variability in their spectra and u-r color variations and estimate parameters of the inner disk warp using an occultation model proposed for AA Tau. We compare infrared and optical light curves to analyze the dust responsible for the occultations. AA Tau-like variability is transient on a timescale of a few years. We ascribe it to stable accretion regimes and aperiodic variability to unstable accretion regimes and show that a transition, and even coexistence, between the two is common. We find evidence of hot spots associated with occultations, indicating that the occulting structures could be located at the base of accretion columns. We find average values of warp maximum height of 0.23 times its radial location, consistent with AA Tau, with variations of on average 11% between rotation cycles. We show that extinction laws in the inner disk indicate the presence of grains larger than interstellar grains. The inner disk warp scenario is consistent with observations for all but one periodic star in our sample. AA Tau-like systems comprise 14% of CTTS observed in NGC 2264, though this increases to 35% among systems of mass 0.7M_sun
β-delayed particle decay of 9C and the A = 9, T = 1/2 nuclear system: Experiment, data, and phenomenological analysis
Creators: name: Jackson, K.P.
name: Iliadis, C.
name: Chow, J.C.
name: Gete, E.
name: Azuma, R.E.
name: D'Auria, J.M.
name: Buchmann, L.
name: Morton, A.C.
name: Bateman, N.
name: Anthony, D.
name: Dombsky, M.
name: King, J.D.
name: Giesen, U.
name: Measday, D.F.
Publisher: name: American Physical Society
Year: 2000

description: The β decay of 9C (T1/2 = 126.5 ms) has been studied in two experiments observing about 15 × 107 and 8 × 107 decays, respectively, at the TISOL facility at TRIUMF; different detector configurations were employed in the two experiments. In this first of two papers, the two experimental setups are described, as well as data analysis and a phenomenological approach to deducing branching ratios to and from states in 9B. In the experiments single spectra, and double and triple coincidence spectra, were recorded. Several states in 9B were observed; β-branching ratios to these states, and particle decay channels from these states, are reported. In particular, secondary decays into the 5Li and 8Be ground states were observed. With the inclusion of a considerable continuum and additional states, fair agreement with the reported 9Li logft values is found with a phenomenological approach for deducing the branching ratios. To extend the discussion, in a second, forthcoming paper, a multichannel, multistate R-matrix analysis of these data will be described.
Kekule' textures, pseudo-spin one Dirac cones and quadratic band crossings in a graphene-hexagonal indium chalcogenide bilayer
Creators: name: Giovannetti, Gianluca
name: Capone, Massimo
name: Brink, Jeroen van den
name: Ortix, Carmine
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using density-functional theory, we calculate the electronic bandstructure of single-layer graphene on top of hexagonal In_2Te_2 monolayers. The geometric configuration with In and Te atoms at centers of carbon hexagons leads to a Kekule' texture with an ensuing bandgap of 20 meV. The alternative structure, nearly degenerate in energy, with the In and Te atoms on top of carbon sites is characterized instead by gapless spectrum with the original Dirac cones of graphene reshaped, depending on the graphene-indium chalcogenide distance, either in the form of an undoubled pseudo-spin one Dirac cone or in a quadratic band crossing point at the Fermi level. These electronic phases harbor charge fractionalization and topological Mott insulating states of matter.
Thermonuclear reaction rate of 23Mg(p,γ)24Al
Creators: name: Herndl, H.
name: Fantini, M.
name: Iliadis, C.
name: Oberhummer, H.
name: Endt, P.M.
Publisher: name: American Physical Society
Year: 1998

description: Updated stellar rates for the reaction 23Mg(p,g )24Al are calculated by using all available experimental information on 24Al excitation energies. Proton and g -ray partial widths for astrophysically important resonances are derived from shell-model calculations. Correspondences of experimentally observed 24Al levels with shell-model states are based on application of the isobaric multiplet mass equation. Our new rates suggest that the 23Mg(p,g )24Al reaction influences the nucleosynthesis in the mass A.20 region during thermonuclear runaways on massive white dwarfs.
Three-particle breakup of the isobaric analog state in 17F
Creators: name: Dombsky, M.
name: Buchmann, L.
name: Jackson, K.P.
name: Roy, G.
name: Shotter, A.
name: Galster, W.
name: Giesen, U.
name: Boyd, R.N.
name: Bateman, N.
name: King, J.D.
name: Iliadis, C.
name: Chow, J.C.
name: D'Auria, J.M.
name: Davinson, T.
name: Gete, E.
name: Shoppa, T.
name: Azuma, R.E.
name: Morton, A.C.
Publisher: name: American Physical Society
Year: 1998

description: We have studied the b-delayed particle decay of 17Ne to test the feasibility of determining both the E1 and E2 components of the 12C(a,g )16O cross section at energies relevant to helium burning in stars. In this context we have observed the breakup of the isobaric analog state in 17F at 11.193 MeV into three particles via three channels: proton decay to the 9.59 MeV state in 16O; and a decay to the 2.365 and 3.502/3.547 MeV states in 13N. This is the first reported observation of the decay of the IAS to the 12 state in 16O at 9.59 MeV and the first reported b-delayed proton-a decay. With straightforward improvements to our detection apparatus to improve angular resolution, b suppression, and solid angle coverage, we should be able to proceed to the measurement of the effect of the tail of the subthreshold state at 7.117 MeV in 16O on thea spectrum from the breakup of the 9.59 MeV state.
Steklov eigenvalues and quasiconformal maps of simply connected planar domains
Creators: name: Girouard, A.
name: Laugesen, R. S.
name: Siudeja, B. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Spectral Theory (math.SP)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary 35P15. Secondary 35J20, 30C62

description: We investigate isoperimetric upper bounds for sums of consecutive Steklov eigenvalues of planar domains. The normalization involves the perimeter and scale-invariant geometric factors which measure deviation of the domain from roundness. We prove sharp upper bounds for both starlike and simply connected domains, for a large collection of spectral functionals including partial sums of the zeta function and heat trace. The proofs rely on a special class of quasiconformal mappings.
Economic Effects of U.S. Grades for Lamb
Creators: name: Fienup, Darrell F.
name: Motes, William C.
name: Hiemstra, Stephen J.
name: Laubis, Robert L.
name: Fienup, Darrell F.
name: Motes, William C.
name: Hiemstra, Stephen J.
name: Laubis, Robert L.
Publisher: name: Unknown
Year: 1963
Subjects: subject: Agricultural and Food Policy
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business

description: Excerpts from the report Summary: For more than three decades the Department of Agriculture has offered a Federal grading service for lamb and mutton carcasses. During recent years about two-fifths of all the lamb and mutton produced in the United States has been federally graded. This service is provided on request and paid for by those who use it. Federal grades have an important positive effect on lamb marketing. They promote competition among buyers, among sellers, and between buyers and sellers. They facilitate trade and may lower total marketing costs. Both of these forces tend to prevent packers and retailers from, widening margins at the expense of their suppliers and consumers. Federal grading helps the pricing system direct production by rewarding the producers of desirable lambs relative to producers of lambs that are less desirable from the consumer's point of view. Although Federal grading does not affect all segments of the lamb industry equally, the net impact appears to be favorable from, the public interest and overall industry points of view.
Statistically optimal analysis of state-discretized trajectory data from multiple thermodynamic states
Creators: name: Wu, Hao
name: Mey, Antonia S. J. S.
name: Rosta, Edina
name: Noé, Frank
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We propose a discrete transition-based reweighting analysis method (dTRAM) for analyzing configuration-space-discretized simulation trajectories produced at different thermodynamic states (temperatures, Hamiltonians, etc.) dTRAM provides maximum-likelihood estimates of stationary quantities (probabilities, free energies, expectation values) at any thermodynamic state. In contrast to the weighted histogram analysis method (WHAM), dTRAM does not require data to be sampled from global equilibrium, and can thus produce superior estimates for enhanced sampling data such as parallel/simulated tempering, replica exchange, umbrella sampling, or metadynamics. In addition, dTRAM provides optimal estimates of Markov state models (MSMs) from the discretized state-space trajectories at all thermodynamic states. Under suitable conditions, these MSMs can be used to calculate kinetic quantities (e.g. rates, timescales). In the limit of a single thermodynamic state, dTRAM estimates a maximum likelihood reversible MSM, while in the limit of uncorrelated sampling data, dTRAM is identical to WHAM. dTRAM is thus a generalization to both estimators.
How the Quantity and Hue Contrast of Interface Color Coding Affect Human Perception: Evidence from Two EEG Studies
Creators: name: , ChangyunMa
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Engineering

description: Color has considerable effects on physiological and psychological perception during human-machine interaction. However, previous studies either compared the whole sets of color schemes or only looked at single colors. It needs to be clarified how quantitative coding methods of interface color affect user perception. This paper focused on two dimensions of color coding, quantity and hue contrast, to explore the physio-psychological underpinning of the perceptual discomfort brought on by excessive colors and inappropriate hue contrast. Further, we applied the Gestalt similarity law to determine if color grouping could lessen the perceptual workload. In present study, 22 participants viewed color stimulus with their brain activity, subjective emotional experience and visual discomfort being measured, reflecting the three main neural pathways of human vision. The results of the time-frequency analysis on electroencephalographic (EEG) revealed consistently with the subjective evaluations that the expanded colors and sharper hue combinations caused a boosted activation of visual cortex, higher emotional arousal, and a deterioration of the visual comfort. In addition, groupings constituted by distinct colors from identical hues substantially lessons perceptual load of visual processing, broadening the grouping criteria in previous Gestalt research that employed exact identical colors.
Characterizing Re-Triage Guidelines: A Scoping Review of States’ Rules and Regulations
Creators: name: Stey, Anne
name: Broderick, Conor
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Surgery
subject: Trauma
subject: Medical Specialties
subject: Medicine and Health Sciences

description: Re-triage is the emergent interfacility transfer of severely injured trauma patients from non-trauma hospitals to trauma centers. This study identifies states that have re-triage guidelines and analyzes the type and range of criteria used to identify patients in need of re-triage.
Restoration of Parity and the Right-Handed Analog of the CKM Matrix
Creators: name: Senjanović, Goran
name: Tello, Vladimir
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In a recent Letter we determined analytically the right-handed quark mixing matrix in the minimal Left-Right symmetric theory with generalized Parity. We derived its explicit form as a series expansion in a small parameter that measures the departure from hermiticity of quark mass matrices. Here we analyze carefully the convergence of the series by including higher order terms and by comparing with numerical results. We apply our findings to some phenomenological applications such as the production and decays of the right-handed gauge boson $W_R$, the neutrinoless double beta decay, the decays of the heavy scalar doublet, the strong CP parameter and the theoretical limits on the new mass scale from the $K$ and $B$-meson physics. In particular, we demonstrate that the relevant coupling for the production of the $W_R$ gauge boson at hadronic colliders and for the neutrinoless double beta decay equals its left-handed counterpart, within a percent. We also demonstrate that the stability of the theoretical lower limit on the $W_R$ mass from the $K$-meson physics is due to a partial cancellation of the external phases of the right-handed mixing matrix.
description: 14 pages, 4 figures, polished some formulas (results unchanged), added a few references
Breakout from the hot CNO cycle: The 18F(p,γ) vs 18F(p,α) branching ratio
Creators: name: Parker, P.D.
name: Bateman, N.P.T.
name: Bardayan, D.W.
name: Yildiz, K.
name: Smith, M.S.
name: Utku, S.
name: Chen, A.A.
name: Howard, A.J.
name: Vogelaar, R.B.
name: Ross, J.G.
name: Görres, J.
name: Iliadis, C.
name: Wiescher, M.
Publisher: name: American Physical Society
Year: 1998

description: We have studied the properties of low-lying 18Fp resonances as excited states in 19Ne. Three new levels have been found in the range 0Ec.m.1 MeV just above the 18Fp threshold, and partial decay widths and isospin-mirror connections are suggested to known states in 19F for each of the nine states in this energy range. The properties of these resonances have been used to calculate the reaction rate NAvfor the 18F(p,)19Ne and 18F(p,)15O reactions in the temperature range 108T109. A comparison of these rates indicates that in this temperature range, the 14O(,p)17F(p,)18Ne(e)18F(p,)19Ne reaction sequence is not as fast as the 15O(,)19Ne reaction.
zfit - TensorFlow 2.0: dynamic and compiled HPC
Creators: name: Eschle, Jonas
Publisher: name: Zenodo
Year: 2020

description: zfit is a model fitting library completely implemented in Python and based on the Deep Learning framework TensorFlow. With the recent release of TensorFlow 2.0, the structure of the TensorFlow library, as well as zfit, fundamentally changed; what was before a head-twisting exotic graph building library became a numpy-like, JIT compilable computational backend. It works with Numpy compatible arrays and offers an alternative to the Numpy + numba combination offering possibly more features such as GPU support and gradients. This new approach together with other developments make zfit a versatile library that fully supports now functions which use Python dynamics as well as being compatible with other, Numpy array using packages.
 In this tutorial, we will talk 10' with classical slides introducing TensorFlow 2.0 as a computational, Numpy-like library and the impact of this on zfit. The other 10' mins will be spent in a notebook showing some functions with TensorFlow 2.0 code as a direct alternative to Numpy + numba (and others).
Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
Creators: name: Robertson, Brant E.
name: Ellis, Richard S.
name: Furlanetto, Steven R.
name: Dunlop, James S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We discuss new constraints on the epoch of cosmic reionization and test the assumption that most of the ionizing photons responsible arose from high redshift star-forming galaxies. Good progress has been made in charting the end of reionization through spectroscopic studies of z~6-8 QSOs, gamma-ray bursts and galaxies expected to host Lyman-alpha emission. However, the most stringent constraints on its duration have come from the integrated optical depth, tau, of Thomson scattering to the cosmic microwave background. Using the latest data on the abundance and luminosity distribution of distant galaxies from Hubble Space Telescope imaging, we simultaneously match the reduced value tau=0.066 +/- 0.012 recently reported by the Planck collaboration and the evolving neutrality of the intergalactic medium with a reionization history within 6 >10) galaxies. Our analysis strengthens the conclusion that star-forming galaxies dominated the reionization process and has important implications for upcoming 21cm experiments and searches for early galaxies with James Webb Space Telescope.
description: Version accepted by ApJL on Mar. 2, 2015
Evolution of angular-momentum-losing exoplanetary systems : Revisiting Darwin stability
Creators: name: Damiani, C.
name: Lanza, A. F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We assess the importance of tidal evolution and its interplay with magnetic braking in the population of hot-Jupiter planetary systems. By minimizing the total mechanical energy of a given system under the constraint of stellar angular momentum loss, we rigorously find the conditions for the existence of dynamical equilibrium states. We estimate their duration, in particular when the wind torque spinning down the star is almost compensated by the tidal torque spinning it up. We introduce dimensionless variables to characterize the tidal evolution of observed hot Jupiter systems and discuss their spin and orbital states using generalized Darwin diagrams based on our new approach. We show that their orbital properties are related to the effective temperature of their host stars. The long-term evolution of planets orbiting F- and G-type stars is significantly different owing to the combined effect of magnetic braking and tidal dissipation. The existence of a quasi-stationary state, in the case of short-period planets, can significantly delay their tidal evolution that would otherwise bring the planet to fall into its host star. Most of the planets known to orbit F-type stars are presently found to be near this stationary state, probably in a configuration not too far from that they had when their host star settled on the zero-age main sequence. Considering the importance of angular momentum loss in the early stages of stellar evolution, our results indicate that it has to be taken into account also to properly test the migration scenarios of planetary system formation.
description: 22 pages, 11 figures, accepted for publication in A&A
New stellar reaction rates for 25Mg(p,γ) 26Al and 25Al(p,γ) 26Si
Creators: name: Wiescher, M.
name: Endt, P.M.
name: Herndl, H.
name: Buchmann, L.
name: Iliadis, C.
Publisher: name: American Physical Society
Year: 1996

description: Existing experimental proton stripping reaction data on 25Mg leading to threshold states in 26Al are reinvestigated and reanalyzed in a consistent and improved manner. We use unbound state form factors in the DWBA analysis of the measured deuteron angular distributions to deduce absolute rather than relative proton partial widths. For higher-lying resonances these values are compared to widths obtained from (p,γ) work. It is also shown that several of the unique Jπ values assigned previously to 26Al states are erroneous. This paper reports on a reanalysis of spins, parities, and isospins for 26Al states located at Ex<8.00 MeV. We deduce new stellar rates for the reaction 25Mg(p,γ)26Al and compare our results with previous values. Furthermore, shell-model calculations for the mass A = 26 system are performed. Theoretical excitation energies, Jπ values, γ-ray transition strengths, spectroscopic factors, and proton partial widths are compared to experimental data and new shell-model assignments of experimental states in 26Al are derived. We estimate Coulomb displacement energies of excited 26Mg and 26Si mirror states and present new analog assignments for T = 1 triplet states in A = 26 nuclei. Based on shell-model results and analog state information we present updated stellar rates for the 25Al(p,γ)26Si reaction.
Hessian of Bellman functions and uniqueness of Brascamp--Lieb inequality
Creators: name: Ivanisvili, P.
name: Volberg, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: F.2.2
subject: 42B20, 42B35, 47A30

description: Under some assumptions on the vectors $a_{1},..,a_{n} \in\mathbb{R}^{k}$ and the function $B : \mathbb{R}^{n} \to \mathbb{R}$ we find the sharp estimate of the expression $\int_{\mathbb{R}^{k}} B(u_{1}(a_{1}\cdot x),..., u_{n}(a_{n}\cdot x))dx$ in terms of $\int_{\mathbb{R}}u_{j}(y)dy, j=1,...,n.$ In some particular case we will show that these assumptions on $B$ imply that there is only one Brascamp--Lieb inequality.
description: 16 pages
Indirect study of low-energy resonances in P31(p,)28Si and Cl35(p,)32S
Creators: name: Iliadis, C.
name: Bateman, N.P.T.
name: Vouzoukas, S.
name: Ross, J.G.
name: Vogelaar, R.B.
name: Parker, P.D.
name: Wiescher, M.
name: Görres, J.
name: Utku, S.
Publisher: name: American Physical Society
Year: 1995

description: The reaction sequences governing the reaction flow in the rp process are important for the understanding of the energy generation and nucleosynthesis of heavy elements in hot and explosive stellar hydrogen burning. Of considerable interest are (p,) reactions along the process path which lead to the formation of reaction cycles rather than to chains of proton capture processes and decays. Previous direct attempts to measure the low-energy reaction cross sections for P31(p,)28Si and Cl35(p,)32S resulted only in upper limits for the strengths of possible low-energy resonances which may dominate the reaction rates. In this paper an indirect experimental approach is presented to study the structure of the low-energy unbound states in the compound nuclei 32 S and Ar36. The results allow a more accurate determination of the contributions of these low-energy levels in the (p,) reaction channel.
A Note on Boltzmann Brains
Creators: name: Nomura, Yasunori
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Understanding the observed arrow of time is equivalent, under general assumptions, to explaining why Boltzmann brains do not overwhelm ordinary observers. It is usually thought that this provides a condition on the decay rate of every cosmologically accessible de Sitter vacuum, and that this condition is determined by the production rate of Boltzmann brains calculated using semiclassical theory built on each such vacuum. We argue, based on a recently developed picture of microscopic quantum gravitational degrees of freedom, that this thinking needs to be modified. In particular, depending on the structure of the fundamental theory, the decay rate of a de Sitter vacuum may not have to satisfy any condition except for the one imposed by the Poincare recurrence. The framework discussed here also addresses the question of whether a Minkowski vacuum may produce Boltzmann brains.
description: 10 pages, 1 figure; discussion in Section 4 modified and expanded
Persian Sentiment Analyzer: A Framework based on a Novel Feature Selection Method
Creators: name: Bagheri, Ayoub
name: Saraee, Mohamad
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: In the recent decade, with the enormous growth of digital content in internet and databases, sentiment analysis has received more and more attention between information retrieval and natural language processing researchers. Sentiment analysis aims to use automated tools to detect subjective information from reviews. One of the main challenges in sentiment analysis is feature selection. Feature selection is widely used as the first stage of analysis and classification tasks to reduce the dimension of problem, and improve speed by the elimination of irrelevant and redundant features. Up to now as there are few researches conducted on feature selection in sentiment analysis, there are very rare works for Persian sentiment analysis. This paper considers the problem of sentiment classification using different feature selection methods for online customer reviews in Persian language. Three of the challenges of Persian text are using of a wide variety of declensional suffixes, different word spacing and many informal or colloquial words. In this paper we study these challenges by proposing a model for sentiment classification of Persian review documents. The proposed model is based on lemmatization and feature selection and is employed Naive Bayes algorithm for classification. We evaluate the performance of the model on a manually gathered collection of cellphone reviews, where the results show the effectiveness of the proposed approaches.
Reaction rate for S31(p,)32Cl and its influence on the SiP cycle in hot stellar hydrogen burning
Creators: name: Browne, C.P.
name: Wiescher, M.
name: Iliadis, C.
name: Graff, S.M.
name: Van Wormer, L.
name: Meissner, J.
name: Scheller, K.
name: Vouzoukas, S.
name: Görres, J.
name: Giesen, U.
name: Ross, J.G.
name: Herndl, H.
name: Rollefson, A.A.
name: Lamm, L.O.
Publisher: name: American Physical Society
Year: 1994

description: The excitation energies of the proton unbound states in Cl32 have been measured in the S32(3He,t)32Cl charge exchange reaction with high accuracy. The partial widths of the unbound levels have been calculated to derive the resonance strengths of these states in the S31(p,)32Cl reaction channel. The reaction rate for the S31(p,)32Cl reaction has been calculated and is compared with previous estimates. The role of this reaction for the closure of the SiP cycle is discussed in terms of the temperature and density conditions in hot stellar hydrogen burning.
Electron-phonon correlations on spin texture of gapped helical Dirac Fermions
Creators: name: Li, Zhou
name: Carbotte, J. P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The metallic surface states of a topological insulator support helical Dirac fermions protected by topology with their spin locked perpendicular to their momentum. They can acquire mass through magnetic doping or through hybridization of states on opposite faces of a thin sample. In this case there can be a component of electron spin oriented perpendicular to the surface plane. The electron-phonon interaction renormalizes the dynamics of the charge carriers through their spectral density. It also modifies the gap channel and a second spectral function enters which, not only determines the out of plane spin component, but also comes into in-plane properties. While the out of plane spin component is decreased below the Fermi momentum ($k_F$), the in plane component increases. There are also correlation tails extending well beyond $k_F$. The angular resolved photo-emission line shapes aquire Holstein side bands. The effective gap in the density of states is reduced and the optical conductivity aquires distinct measurable phonon structure even for modest value of the electron-phonon coupling.
description: 9pages, 9 figures
Accretion of the Moon from non-canonical disks
Creators: name: Salmon, Julien
name: Canup, Robin M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Impacts that leave the Earth-Moon system with a large excess in angular momentum have recently been advocated as a means of generating a protolunar disc with a composition that is nearly identical to that of the Earth's mantle. We here investigate the accretion of the Moon from discs generated by such "non-canonical" impacts, which are typically more compact than discs produced by canonical impacts and have a higher fraction of their mass initially located inside the Roche limit. Our model predicts a similar overall accretional history for both canonical and non-canonical discs, with the Moon forming in three consecutive steps over hundreds of years. However, we find that, to yield a lunar-mass Moon, the more compact non-canonical discs must initially be more massive than implied by prior estimates, and only a few of the discs produced by impact simulations to date appear to meet this condition. Non-canonical impacts require that capture of the Moon into the evection resonance with the Sun reduced the Earth-Moon angular momentum by a factor of 2 or more. We find that the Moon's semimajor axis at the end of its accretion is approximately $7R_\oplus$, which is comparable to the location of the evection resonance for a post-impact Earth with a 2.5 h rotation period in the absence of a disc. Thus, the dynamics of the Moon's assembly may directly affect its ability to be captured into the resonance.
description: 14 pages, 5 figures, 2 tables
Measurement of the resonance at ER=1422 keV in Ar36(p,γ)37K
Creators: name: Höhne, J.
name: Meissner, J.
name: Käppeler, F.
name: Wiescher, M.
name: Trautvetter, H.P.
name: Iliadis, C.
Publisher: name: American Physical Society
Year: 1993

description: A new resonance at ER=1422 keV has been found in the reaction Ar36(p,γ)37K. From its measured resonance strength of ωγ=(6.0±1.5)×10-4 eV the proton partial width Γp can be calculated. Our data suggest a value of Γγ/Γp40 for the ratio of γ to proton partial width for the corresponding state at Ex=3241 keV in K37. We find that the corrected distribution of Gamow-Teller strength below the isobaric analog state as obtained from the β-delayed proton decay of Ca37 is in agreement with the results inferred from the Cl37(p,n)37Ar reaction.
Baryon Spectrum from Superconformal Quantum Mechanics and its Light-Front Holographic Embedding
Creators: name: de Teramond, Guy F.
name: Dosch, Hans Gunter
name: Brodsky, Stanley J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe the observed light-baryon spectrum by extending superconformal quantum mechanics to the light front and its embedding in AdS space. This procedure uniquely determines the confinement potential for arbitrary half-integer spin. To this end, we show that fermionic wave equations in AdS space are dual to light-front supersymmetric quantum mechanical bound-state equations in physical space-time. The specific breaking of conformal invariance explains hadronic properties common to light mesons and baryons, such as the observed mass pattern in the radial and orbital excitations, from the spectrum generating algebra. The holographic embedding in AdS also explains distinctive and systematic features, such as the spin-$J$ degeneracy for states with the same orbital angular momentum, observed in the light baryon spectrum.
description: 31 pages, 1 figure, added references and few minor changes
Avoiding tipping points in fisheries management through Gaussian Process Dynamic Programming
Creators: name: Boettiger, Carl
name: Mangel, Marc
name: Munch, Stephan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Model uncertainty and limited data are fundamental challenges to robust management of human intervention in a natural system. These challenges are acutely highlighted by concerns that many ecological systems may contain tipping points, such as Allee population sizes. Before a collapse, we do not know where the tipping points lie, if they exist at all. Hence, we know neither a complete model of the system dynamics nor do we have access to data in some large region of state-space where such a tipping point might exist. We illustrate how a Bayesian Non-Parametric (BNP) approach using a Gaussian Process (GP) prior provides a flexible representation of this inherent uncertainty. We embed GPs in a Stochastic Dynamic Programming (SDP) framework in order to make robust management predictions with both model uncertainty and limited data. We use simulations to evaluate this approach as compared with the standard approach of using model selection to choose from a set of candidate models. We find that model selection erroneously favors models without tipping points -- leading to harvest policies that guarantee extinction. The GPDP performs nearly as well as the true model and significantly outperforms standard approaches. We illustrate this using examples of simulated single-species dynamics, where the standard model selection approach should be most effective, and find that it still fails to account for uncertainty appropriately and leads to population crashes, while management based on the GPDP does not, since it does not underestimate the uncertainty outside of the observed data.
description: 2015 Proceedings of the Royal Society B: Biological Sciences
Action-angle variables and a KAM theorem for b-Poisson manifolds
Creators: name: Kiesenhofer, Anna
name: Miranda, Eva
name: Scott, Geoffrey
Publisher: name: arXiv
Year: 2015
Subjects: subject: Symplectic Geometry (math.SG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In this article we prove an action-angle theorem for b-integrable systems on b-Poisson manifolds improving the action-angle theorem contained in [LMV11] for general Poisson manifolds in this setting. As an application, we prove a KAM-type theorem for b-Poisson manifolds.
description: 24 pages, 3 figures, the KAM theorem has been improved, minor corrections
Probing the Physical Conditions of Atomic Gas at High Redshift
Creators: name: Neeleman, Marcel
name: Prochaska, J. Xavier
name: Wolfe, Arthur. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A new method is used to measure the physical conditions of the gas in damped Lyman-alpha systems (DLAs). Using high resolution absorption spectra of a sample of 80 DLAs, we are able to measure the ratio of the upper to lower fine-structure levels of the ground state of C II and Si II. These ratios are determined solely by the physical conditions of the gas. We explore the allowed physical parameter space using a Monte Carlo Markov Chain method to constrain simultaneously the temperature, neutral hydrogen density, and electron density of each DLA. The results indicate that at least 5 % of all DLAs have the bulk of their gas in a dense, cold phase with typical densities of ~100 cm-3 and temperatures below 500 K. We further find that the typical pressure of DLAs in our sample is log(P/k) = 3.4 [K cm-3], which is comparable to the pressure of the local interstellar medium (ISM), and that the components containing the bulk of the neutral gas can be quite small with absorption sizes as small as a few parsec. We show that the majority of the systems are consistent with having densities significantly higher than expected from a purely canonical WNM, indicating that significant quantities of dense gas (i.e. n_H > 0.1 cm-3) are required to match observations. Finally, we identify 8 systems with positive detections of Si II*. These systems have pressures (P/k) in excess of 20000 K cm-3, which suggest that these systems tag a highly turbulent ISM in young, star-forming galaxies.
description: 21 Pages, 11 figures, Accepted to ApJ
Towards intelligent geo-database support for earth system observation: Improving the preparation and analysis of big spatio-temporal raster data
Creators: name: Mazroob Semnani, N.
name: Breunig, M.
name: Al-Doori, M.
name: Heck, A.
name: Kuper, P.
name: Kutterer, H.
Publisher: name: Karlsruhe
Year: 2020
Subjects: Spatio-Temporal Data Management
Spatio-Temporal Data Processing
Big Geospatial Raster Data
Intelligent Geospatial Data Analysis

description: The European COPERNICUS program provides an unprecedented breakthrough in the broad use and application of satellite remote sensing data. Maintained on a sustainable basis, the COPERNICUS system is operated on a free-and-open data policy. Its guaranteed availability in the long term attracts a broader community to remote sensing applications. In general, the increasing amount of satellite remote sensing data opens the door to the diverse and advanced analysis of this data for earth system science. However, the preparation of the data for dedicated processing is still inefficient as it requires time-consuming operator interaction based on advanced technical skills. Thus, the involved scientists have to spend significant parts of the available project budget rather on data preparation than on science. In addition, the analysis of the rich content of the remote sensing data requires new concepts for better extraction of promising structures and signals as an effective basis for further analysis. In this paper we propose approaches to improve the preparation of satellite remote sensing data by a geo-database. Thus the time needed and the errors possibly introduced by human interaction are minimized. In addition, it is recommended to improve data quality and the analysis of the data by incorporating Artificial Intelligence methods. A use case for data preparation and analysis is presented for earth surface deformation analysis in the Upper Rhine Valley, Germany, based on Persistent Scatterer Interferometric Synthetic Aperture Radar data. Finally, we give an outlook on our future research.
Model building and statistical inference with zfit and hepstats
Creators: name: Eschle, Jonas
name: Marinangeli, Matthieu
Publisher: name: Zenodo
Year: 2020

description: zfit is a model fitting library based on top of TensorFlow and built for customization. It can build models, load data, create and optimize losses. hepstats is a package for statistical inference and is build on top of the zfit interface, and can therefore use models and losses built in zfit directly. In this tutorial, we propose to split the tutorial into two parts (switching speaker in-between): we first give an introduction (~30 mins) to zfit ranging from simple mass fits to more complicated examples including custom built PDFs and simultaneous fits. The second part (~15 mins) consists of an introduction to hepstats using the models and losses built before in zfit for statistical inference including limit setting and confidence intervals. The tutorial is targeted towards beginners regarding the experience with zfit or hepstats.
Knot homotopy in subspaces of the 3-sphere
Creators: name: Koda, Yuya
name: Ozawa, Makoto
Publisher: name: arXiv
Year: 2015
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M15, 57N10, 57Q35

description: We discuss an "extrinsic" property of knots in a 3-subspace of the 3-sphere $S^3$ to characterize how the subspace is embedded in $S^3$. Specifically, we show that every knot in a subspace of the 3-sphere is transient if and only if the exterior of the subspace is a disjoint union of handlebodies, i.e. regular neighborhoods of embedded graphs, where a knot in a 3-subspace of $S^3$ is said to be transient if it can be moved by a homotopy within the subspace to the trivial knot in $S^3$. To show this, we discuss relation between certain group-theoretic and homotopic properties of knots in a compact 3-manifold, which can be of independent interest. Further, using the notion of transient knot, we define an integer-valued invariant of knots in $S^3$ that we call the transient number. We then show that the union of the sets of knots of unknotting number one and tunnel number one is a proper subset of the set of knots of transient number one.
description: 22 pages, 14 figures; minor changes
Reaction Ar36(p,)37K in explosive hydrogen burning
Creators: name: Iliadis, C.
name: Görres, J.
name: Wiescher, M.
name: Ross, J.G.
name: Graff, S.M.
name: Azuma, R.E.
Publisher: name: American Physical Society
Year: 1992

description: The reaction Ar36(p,)37K has been measured in the proton energy range of Ep=0.320.93 MeV. A new resonance was found at ER=321 keV. We have measured the branching ratios and the resonance strength. The stellar reaction rates which are dominated by this resonance for temperatures T=0.070.9 GK are calculated. Network calculations have been performed to investigate the influence of the new stellar rates on the time evolution of the Ar36 abundance during explosive H burning.