cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Sample-dependent Dirac point gap in MnBi$_2$Te$_4$ and its response to the applied surface charge: a combined photoemission and ab initio study
Creators: name: Shikin, A. M.
name: Estyunin, D. A.
name: Zaitsev, N. L.
name: Glazkova, D.
name: Klimovskikh, I. I.
name: Filnov, S.
name: Rybkin, A. G.
name: Schwier, E. F.
name: Kumar, S.
name: Kimura, A.
name: Mamedov, N.
name: Aliev, Z.
name: Babanly, M. B.
name: Kokh, K.
name: Tereshchenko, O. E.
name: Otrokov, M. M.
name: Chulkov, E. V.
name: Zvezdin, K. A.
name: Zvezdin, A. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recently discovered intrinsic antiferromagnetic topological insulator MnBi$_2$Te$_4$ presents an exciting platform for realization of the quantum anomalous Hall effect and a number of related phenomena at elevated temperatures. An important characteristic making this material attractive for applications is its predicted large magnetic gap at the Dirac point (DP). However, while the early experimental measurements reported on large DP gaps, a number of recent studies claimed to observe a gapless dispersion of the MnBi$_2$Te$_4$ Dirac cone. Here, using micro($μ$)-laser angle-resolved photoemission spectroscopy, we study the electronic structure of 15 different MnBi$_2$Te$_4$ samples, grown by two different chemists groups. Based on the careful energy distribution curves analysis, the DP gaps between 15 and 65 meV are observed, as measured below the Néel temperature at about 10-16 K. At that, roughly half of the studied samples show the DP gap of about 30 meV, while for a quarter of the samples the gaps are in the 50 to 60 meV range. Summarizing the results of both our and other groups, in the currently available MnBi$_2$Te$_4$ samples the DP gap can acquire an arbitrary value between a few and several tens of meV. Further, based on the density functional theory, we discuss a possible factor that might contribute to the reduction of the DP gap size, which is the excess surface charge that can appear due to various defects in surface region. We demonstrate that the DP gap is influenced by the applied surface charge and even can be closed, which can be taken advantage of to tune the MnBi$_2$Te$_4$ DP gap size.
Erasing Dark Matter Cusps in Cosmological Galactic Halos with Baryons
Creators: name: Romano-Diaz, Emilio
name: Shlosman, Isaac
name: Hoffman, Yehuda
name: Heller, Clayton
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the central dark matter (DM) cusp evolution in cosmological galactic halos. Models with and without baryons (baryons+DM, hereafter BDM model, and pure DM, PDM model, respectively) are advanced from identical initial conditions. The DM cusp properties are contrasted by a direct comparison of pure DM and baryonic models. We find a divergent evolution between the PDM and BDM models within the inner ~10 kpc region. The PDM model forms a R^{-1} cusp as expected, while the DM in the BDM model forms a larger isothermal cusp R^{-2} instead. The isothermal cusp is stable until z~1 when it gradually levels off. This leveling proceeds from inside out and the final density slope is shallower than -1 within the central 3 kpc (i.e., expected size of the R^{-1} cusp), tending to a flat core within ~2 kpc. This effect cannot be explained by a finite resolution of our code which produces only a 5% difference between the gravitationally softened force and the exact Newtonian force of point masses at 1 kpc from the center. Neither is it related to the energy feedback from stellar evolution or angular momentum transfer from the bar. Instead it can be associated with the action of DM+baryon subhalos heating up the cusp region via dynamical friction and forcing the DM in the cusp to flow out and to `cool' down. The process described here is not limited to low z and can be efficient at intermediate and even high z.
description: 4 pages, 4 figures, accepted for publication by the Astrophysical Journal Letters. Minor corrections following the referee report
Using the Energy Spectrum at DAMA/LIBRA to Probe Light Dark Matter
Creators: name: Chang, Spencer
name: Pierce, Aaron
name: Weiner, Neal
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A weakly interacting massive particle (WIMP) weighing only a few GeV has been invoked as an explanation for the signal from the DAMA/LIBRA experiment. We show that the data from DAMA/LIBRA are now powerful enough to strongly constrain the properties of any putative WIMP. Accounting for the detailed recoil spectrum, a light WIMP with a Maxwellian velocity distribution and a spin-independent (SI) interaction cannot account for the data. Even neglecting the spectrum, much of the parameter space is excluded by limits from the DAMA unmodulated signal at low energies. Significant modifications to the astrophysics or particle physics can open light mass windows.
description: 5 pages, 5 figures
Dynamical, dielectric, and elastic properties of GeTe
Creators: name: Shaltaf, R.
name: Durgun, E.
name: Raty, J. -Y.
name: Ghosez, Ph.
name: Gonze, X.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The dynamical, dielectric and elastic properties of GeTe, a ferroelectric material in its low temperature rhombohedral phase, have been investigated using first-principles density functional theory. We report the electronic energy bands, phonon dispersion curves, electronic and low frequency dielectric tensors, infra-red reflectivity, Born effective charges, elastic and piezoelectric tensors and compare them with the existing theoretical and experimental results, as well as with similar quantities available for other ferroelectric materials, when appropriate.
Modelling And Simulation Of A Carnot Battery Coupled To Seasonal Underground Stratified Thermal Energy Storage For Heating, Cooling And Electricity Generation.
Creators: name: Aitor, Cendoya
name: Frederic, Ransy
name: Vincent, Lemort
name: Andres, Hernandez
name: Pierre, Dewallef
name: Pierre-Henri, Gresse
name: Jacques, Windeshausen
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Gravity Battery
subject: Energy storage
subject: Renewable energy
subject: Decentralized Storage
subject: Sustainable Energy

description: Nowadays, most countries are striving to transition their energy matrices towards renewable sources. To achieve this goal, energy storage systems play a crucial role in compensating for the inherent intermittency ofrenewable sources. Buildings are among the largest consumers of primary energy, due to their heating demands. Consequently, integrating renewable energies into buildings is essential. This paper presents a pioneering approach that integrates renewable energy sources with a multi-energy system. This system powers a Heat Pump (HP) responsible for heating an abandoned mine flooded with water, producing electricity via a Carnot Battery (CB), and distributing heating and cooling through a district heating network (DHN).This study is conducted in a real case of an abandoned slate mine in Martelange, Belgium, where three different size caverns are employed to store energy: 800, 6840, and 80000 m cubed for hot (90 C) medium (50 C) and cold (5 C) water temperature, respectively. The system combines photovoltaic panels, an electrical battery, heat pumps, electrical resistance, and an Organic Rankine Cycle. This study highlights the potential of reusing abandoned mines as energy storage systems, which can benefit adjacent communities by integrating diverse energy demands within a single system. This generates new perspectives for investors and residents, enabling the possibility of connecting the system to the grid for energy arbitrage and balancing services.
The Brightness of Density Structures at Large Solar Elongation Angles: What is Being Observed by STEREO/SECCHI?
Creators: name: Lugaz, N.
name: Vourlidas, A.
name: Roussev, I. I.
name: Jacobs, C.
name: Manchester, W. B.
name: Cohen, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We discuss features of coronal mass ejections (CMEs) that are specific to heliospheric observations at large elongation angles. Our analysis is focused on a series of two eruptions that occurred on 2007 January 24-25, which were tracked by the Heliospheric Imagers (HIs) onboard STEREO. Using a three-dimensional (3-D) magneto-hydrodynamic simulation of these ejections with the Space Weather Modeling Framework (SWMF), we illustrate how the combination of the 3-D nature of CMEs, solar rotation, and geometry associated with the Thomson sphere results in complex effects in the brightness observed by the HIs. Our results demonstrate that these effects make any in-depth analysis of CME observations without 3-D simulations challenging. In particular, the association of bright features seen by the HIs with fronts of CME-driven shocks is far from trivial. In this Letter, we argue that, on 2007 January 26, the HIs observed not only two CMEs, but also a dense corotating stream compressed by the CME-driven shocks.
description: 5 pages, 2 figures, accepted for ApJ Letter
No many-scallop theorem: Collective locomotion of reciprocal swimmers
Creators: name: Lauga, Eric
name: Bartolo, Denis
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: To achieve propulsion at low Reynolds number, a swimmer must deform in a way that is not invariant under time-reversal symmetry; this result is known as the scallop theorem. We show here that there is no many-scallop theorem. We demonstrate that two active particles undergoing reciprocal deformations can swim collectively; moreover, polar particles also experience effective long-range interactions. These results are derived for a minimal dimers model, and generalized to more complex geometries on the basis of symmetry and scaling arguments. We explain how such cooperative locomotion can be realized experimentally by shaking a collection of soft particles with a homogeneous external field.
Analytic treatment of leading-order parton evolution equations: theory and tests
Creators: name: Block, Martin M.
name: Durand, Loyal
name: McKay, Douglas W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We recently derived an explicit expression for the gluon distribution function G(x, Q^2) = xg(x, Q^2) in terms of the proton structure function F_2^{γp} (x, Q^2) in leading-order (LO) QCD by solving the the LO DGLAP equation for the Q^2 evolution of F_2^{γp} (x, Q^2) analytically, using a differential-equation method. We re-derive and extend the results here using a Laplace-transform technique, and show that the singlet quark structure function F_S(x,Q^2) can be determined directly in terms of G from the DGLAP gluon evolution equation. To illustrate the method and check the consistency of existing LO quark and gluon distributions, we used the published values of the LO quark distributions from the CTEQ5L and MRST2001LO analyses to form F_2^{γp} (x, Q^2), and then solved analytically for G(x,Q^2). We find that the analytic and fitted gluon distributions from MRST2001LO agree well with each other for all x and Q^2, while those from CTEQ5L differ significantly from each other for large x values, x>~0.03 - 0.05 at all Q^2. We conclude that the published CTEQ5L distributions are incompatible in this region. Using a non-singlet evolution equation, we obtain a sensitive test of quark distributions which holds in both LO and NLO perturbative QCD. We find in either case that the CTEQ5 quark distributions satisfy the tests numerically for small x, but fail the tests for x>~0.03 - 0.05 - their use could potentially lead to significant shifts in predictions of quantities sensitive to large x. We encountered no problems with the MRST2001LO distributions or later CTEQ distributions. We suggest caution in the use of the CTEQ5 distributions.
description: One reference added. Version accepted for publication in Physical Review D
Falling rate prediction of the Petrea Volubilis winged seed by using the Blade Element Momentum theory (BEM)
Creators: name: GAITAN-AROCA, JORGE
name: Castañeda Vergara, David
name: García-Navarro, Juan
name: Bayona-Roa, Camilo
Publisher: name: Zenodo
Year: 2021
Subjects: Aerodynamics
BEM theory
rotary seeds
biomimetics

description:
 Many winged seeds tend to use rotation as a flight mechanism, which reduces their falling rate and increases their wind dispersal distance (Azuma & Yasuda, 1989). Observations of their flights and the study of the shape of these rotating winged seeds have allowed researchers to conclude that they can be used as bio-inspired wind rotors (Castañeda Vergara, 2010; Correa-Álvarez et al., 2016). In a recent study on the Petrea Volubilis winged seed (Gaitan-Aroca et al., 2020), which has five petals, performance coefficients have been experimentally determined in a scaled seed model. However, the winged seed tip speed ratio, which is closely related to its falling rate and defines its efficiency as a rotor, is unknown.
 This article shows the Petrea Volubilis winged seed falling rate prediction by means of the BEM theory. This theory is implemented through a computational code as the basis for the calculation of this winged seed aerodynamic performance. The input parameters for the falling rate prediction are the aerodynamic coefficients of the winged seed petals, and this prediction is supported by experimental measurements of its rotational speed.
 The falling rate numerical results are then compared with those obtained experimentally. Finally, with the rotational speed and the calculated falling rate, it is possible to measure the tip speed ratio of this rotor, an important design parameter for wind and hydrodynamic rotors, which defines its operating range and efficiency.
The relative concentration of visible and dark matter in clusters of galaxies
Creators: name: De Boni, C.
name: Bertin, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [Abridged] We consider two clusters (A496 and Coma) that are representative of the two classes of cool-core and non-cool-core clusters. We first refer to a two-component dynamical model that ignores the contribution from the galaxy density distribution and study the condition of hydrostatic equilibrium for the hot intracluster medium (ICM) under the assumption of spherical symmetry, in the presence of dark matter. We model the ICM density distribution in terms of a standard $β$-model with $β=2/3$, i.e. with a distribution similar to that of a regular isothermal sphere (RIS), and fit the observed X-ray brightness profiles. With the explicit purpose of ignoring cosmological arguments, we naïvely assume that dark matter, if present, has an analogous density distribution, with the freedom of two different density and length scales. The relative distribution of visible and dark matter is then derived by fitting the temperature data for the ICM under conditions of hydrostatic equilibrium. For both clusters, we find that dark matter is more concentrated with respect to visible matter. We then test whether the conclusion changes significantly when dark matter is taken to be distributed according to cosmologically favored density profiles and when the contribution of the mass contained in galaxies is taken into account. Although the qualitative conclusions remain unchanged, we find that the contribution of galaxies to the mass budget is more important than generally assumed. We also show that, without resorting to additional information on the small scale, it is not possible to tell whether a density cusp is present or absent in these systems. [Abridged]
description: 13 pages, 3 figures, accepted for publication in Il Nuovo Cimento B
The Degree Distribution of Random k-Trees
Creators: name: Gao, Yong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: A power law degree distribution is established for a graph evolution model based on the graph class of k-trees. This k-tree-based graph process can be viewed as an idealized model that captures some characteristics of the preferential attachment and copying mechanisms that existing evolving graph processes fail to model due to technical obstacles. The result also serves as a further cautionary note reinforcing the point of view that a power law degree distribution should not be regarded as the only important characteristic of a complex network, as has been previously argued.
Review: galactic angular momenta and angular momentum correlations in the cosmological large-scale structure
Creators: name: Schaefer, Bjoern Malte
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I review the theory of angular momentum acquisition of galaxies by tidal torquing, the resulting angular momentum distribution, the angular momentum correlation function and discuss the implications of angular momentum alignments on weak lensing measurements: Starting from linear models for tidal torquing I summarise perturbative approaches and the results from n-body simulations of cosmic structure formation. Then I continue to discuss the validity of decompositions of the tidal shear and inertia fields, the effects of angular momentum biasing, the applicability of parameterised angular momentum correlation models and the consequences of angular momentum correlations for shape alignments. I compile the result of observations of shape alignments in recent galaxy surveys as well as in n-body simulations. Finally, I review the contamination of weak lensing surveys by spin-induced shape alignments and methods for suppressing this contamination.
description: 22 pages, 7 figures, invited review for IJMPD
INTEGRAL and Swift/XRT observations of the SFXT IGR J16479-4514: from quiescence to fast flaring activity
Creators: name: Sguera, V.
name: Bassani, L.
name: Landi, R.
name: Bazzano, A.
name: Bird, A. J.
name: Dean, A. J.
name: Malizia, A.
name: Masetti, N.
name: Ubertini, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: IGR J16479-4514 is a fast X-ray transient known to display flares lasting typically a few hours. Recently, its counterpart has been identified with a supergiant star, therefore the source can be classified as member of the newly discovered class of Supergiant Fast X-ray Transients (SFXTs), specifically it is the one with the highest duty cycle. Aims: to characterize the quiescent X-ray behaviour of the source and to compare its broad band spectrum to that during fast X-ray flares. Methods: we performed an analysis of IBIS and JEM-X data with OSA 5.1 as well as an analysis of archival Swift/XRT data. Results: we present results from a long term monitoring of IGR J16479-4514 with detailed spectral and timing informations on 19 bright fast X-ray flares, 10 of which newly discovered. We also report for the first time results on the quiescent X-ray emission; the typical luminosity value (about 10^34 erg s^-1) is about 2 orders of magnitude greater than that typical of SFXTs while its broad band X-ray spectrum has a shape very similar to that during fast X-ray transient activity, i.e. a rather steep power law with Gamma=2.6. Conclusions: IGR J16479$-$4514 is characterized by a quiescent X-ray luminosity higher than that typical of other known SFXTs but lower than persistent emission from classical SGXBs. We suggest that such source is a kind of transition object between these two systems, supporting the idea that there is a continuum of behaviours between the class of SFXTs and that of classical persistent SGXBs.
description: 5 pages, 4 figures, accepted for publication in A&A
Measurement of the Mass Difference m(B0) - m(B+)
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 230 million B Bbar events recorded with the BABAR detector at the e+ e- storage rings PEP-II, we reconstruct approximately 4100 B0 to J/psi K+ pi- and 9930 B+ to J/psi K+ decays with J/psi to mu+ mu- and e+ e-. From the measured B-momentum distributions in the e+ e- rest frame, we determine the mass difference m(B0) - m(B+) = (+0.33 +- 0.05 +- 0.03) MeV/c^2.
description: 8 pages, 2 postscript figures, sumbmitted to Phys. Rev. D, Rapid Communications
USING NORTHERN ANALYSIS TO DETECT SRNAS REGULATED BY THE EXOS/CHVI SIGNALING PATHWAY IN SINORHIZOBIUM MELILOTI
Creators: name: Mack, Laurena Shane
Publisher: name: Zenodo
Year: 2021
Subjects: northern blotting
small RNAs
rhizobia
gene regulation
microbiology
Sinorhizobium meliloti

description: Sinorhizobium meliloti is an alpha-proteobacterium that forms a nitrogen-fixing symbiosis with its plant host Medicago sativa. This symbiosis is an alternative to manufactured nitrogen fertilizers which contribute to greenhouse gas emissions. The ExoS/ChvI two-component signaling pathway in S. meliloti regulates genes that are required for a successful symbiosis. Small regulatory RNAs (sRNAs) are short transcripts that play an important role in regulating gene expression in bacteria. Previous northern blot research aimed to investigate ChvI regulation of 28 sRNA genes using total RNA from cells harvested from rich media. However, 18 sRNAs remained undetected in the previous study. Here, we use RNA enriched for the small RNA fraction and total RNA from cells grown in multiple conditions, including stress conditions, to increase the chances of detecting sRNA gene expression. Also, 44 additional sRNA genes not previously tested by northern analysis are examined in this study. To detect ChvI regulation of sRNA genes, northern analysis was done using RNA extracted from three S. meliloti strains (chvI partial loss-of-function mutant, chvI gain-of-function mutant, and wildtype). An sRNA was determined to be regulated by ChvI if the sRNA showed a reciprocal change in expression in the chvI mutants compared to wildtype. Here, we show that three previously undetected sRNA genes are likely be regulated by ChvI and one of the 44 sRNA genes not previously tested by northern analysis is also likely to be regulated by ChvI. We also confirmed that two previously detected sRNA genes are indeed regulated by ChvI.
Spectral Shaping with Integrated Self-Coupled Sagnac Loop Reflectors
Creators: name: Moss, David J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose and theoretically investigate integrated photonic filters based on coupled Sagnac loop reflectors (SLRs) formed by a self-coupled wire waveguide. By tailoring coherent mode interference in the device, three different filter functions are achieved, including Fano-like resonances, wavelength interleaving, and varied resonance mode splitting. For each function, the impact of device structural parameters is analyzed to facilitate optimized performance. Our results theoretically verify the proposed device as a compact multi-functional integrated photonic filter for flexible spectral shaping.
description: 6 pages,4 figures, 89 references
Pumping-Restriction Theorem for Stochastic Networks
Creators: name: Chernyak, V. Y.
name: Sinitsyn, N. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We formulate an exact result, which we refer to as the pumping restriction theorem (PRT). It imposes strong restrictions on the currents generated by periodic driving in a generic dissipative system with detailed balance. Our theorem unifies previously known results with the new ones and provides a universal nonperturbative approach to explore further restrictions on the stochastic pump effect in non-adiabatically driven systems.
description: 4 pages, 5 figures
The radiative decay of $ψ(3770)$ into the predicted scalar state X(3700)
Creators: name: Gamermann, D.
name: Oset, E.
name: Zou, B. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We calculate the radiative decay width of the $ψ(3770)$ into the dynamically generated scalar resonance X(3700) which is predicted in a previous paper. The results show that it is possible that the upgraded BEPC-II facility will generate enough statistics in order to observe this decay and thus confirm the existence of the X(3700).
description: 5 pages, 1 figure
Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
Creators: name: Roškar, Rok
name: Debattista, Victor P.
name: Quinn, Thomas R.
name: Stinson, Gregory S.
name: Wadsley, James
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Stars in disks of spiral galaxies are usually assumed to remain roughly at their birth radii. This assumption is built into decades of modelling of the evolution of stellar populations in our own Galaxy and in external systems. We present results from self-consistent high-resolution $N$-body + Smooth Particle Hydrodynamics simulations of disk formation, in which stars migrate across significant galactocentric distances due to resonant scattering with transient spiral arms, while preserving their circular orbits. We investigate the implications of such migrations for observed stellar populations. Radial migration provides an explanation for the observed flatness and spread in the age-metallicity relation and the relative lack of metal poor stars in the solar neighborhood. The presence of radial migration also prompts rethinking of interpretations of extra-galactic stellar population data, especially for determinations of star formation histories.
description: 4 pages, 3 figures; Accepted for publication in ApJL
Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission
Creators: name: Ota, N.
name: Murase, K.
name: Kitayama, T.
name: Komatsu, E.
name: Hattori, M.
name: Matsuo, H.
name: Oshima, T.
name: Suto, Y.
name: Yoshikawa, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results from the analysis of long Suzaku observations of the most X-ray luminous galaxy cluster RX J1347.5-1145 at z=0.451. Aims: We study physical properties of the hot (~20 keV) gas clump in the south-east (SE) region discovered by the Sunyaev-Zel'dovich (SZ) effect observations, to understand the gas physics of a violent cluster merger. We also explore a signature of non-thermal emission using the hard X-ray data. Results: We find that the single-temperature model fails to reproduce the continuum emission and Fe-K lines measured by XIS simultaneously. The two-temperature model with a very hot component improves the fit, although the XIS data can only give a lower bound on its temperature. We detect the hard X-ray emission in the 12-40 keV band at the 7 sigma level; however, the significance becomes marginal when the systematic error in the background estimation is included. With the Suzaku + Chandra joint analysis, we determine the temperature of the SE excess component to be 25.3^{+6.1}_{-4.5} ^{+6.9}_{-9.5} keV (90% statistical and systematic errors), which is in an excellent agreement with the previous SZ + X-ray analysis. This is the first time that the X-ray spectroscopy alone gives a good measurement of the temperature of the hot component in the SE region, which is made possible by Suzaku's unprecedented sensitivity to the wide X-ray band. These results strongly indicate that the cluster has undergone a recent, violent merger. The spectral analysis shows that the SE component is consistent with being thermal. We find the 3 sigma upper limit on the non-thermal flux, F < 8e-12 erg s^{-1} cm^{-2} in the 12-60 keV band. Combining this limit with a recent discovery of the radio mini halo at 1.4 GHz, we find a lower limit on the strength of the intracluster magnetic field, B > 0.007 micro G.
description: 15 pages, 13 figures. Accepted for publication in A&A
Dynamical formation of correlations in a Bose-Einstein condensate
Creators: name: Erdos, Laszlo
name: Michelangeli, Alessandro
name: Schlein, Benjamin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81U05, 81U30, 81V70, 82C10

description: We consider the evolution of $N$ bosons interacting with a repulsive short range pair potential in three dimensions. The potential is scaled according to the Gross-Pitaevskii scaling, i.e. it is given by $N^2V(N(x_i-x_j))$. We monitor the behavior of the solution to the $N$-particle Schrödinger equation in a spatial window where two particles are close to each other. We prove that within this window a short scale interparticle structure emerges dynamically. The local correlation between the particles is given by the two-body zero energy scattering mode. This is the characteristic structure that was expected to form within a very short initial time layer and to persist for all later times, on the basis of the validity of the Gross-Pitaevskii equation for the evolution of the Bose-Einstein condensate. The zero energy scattering mode emerges after an initial time layer where all higher energy modes disperse out of the spatial window. We can prove the persistence of this structure up to sufficiently small times before three-particle correlations could develop.
description: 36 pages, latex file
Decoding Generalized Concatenated Codes Using Interleaved Reed-Solomon Codes
Creators: name: Senger, Christian
name: Sidorenko, Vladimir
name: Bossert, Martin
name: Zyablov, Victor
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Generalized Concatenated codes are a code construction consisting of a number of outer codes whose code symbols are protected by an inner code. As outer codes, we assume the most frequently used Reed-Solomon codes; as inner code, we assume some linear block code which can be decoded up to half its minimum distance. Decoding up to half the minimum distance of Generalized Concatenated codes is classically achieved by the Blokh-Zyablov-Dumer algorithm, which iteratively decodes by first using the inner decoder to get an estimate of the outer code words and then using an outer error/erasure decoder with a varying number of erasures determined by a set of pre-calculated thresholds. In this paper, a modified version of the Blokh-Zyablov-Dumer algorithm is proposed, which exploits the fact that a number of outer Reed-Solomon codes with average minimum distance d can be grouped into one single Interleaved Reed-Solomon code which can be decoded beyond d/2. This allows to skip a number of decoding iterations on the one hand and to reduce the complexity of each decoding iteration significantly - while maintaining the decoding performance - on the other.
description: Proceedings of the 2008 IEEE International Symposium on Information Theory, Toronto, ON, Canada, July 6 - 11, 2008. 5 pages, 2 figures
Pascal-F, A portable Fortran-based Pascal Compiler
Creators: name: Manning, Joseph
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the subject of compiler portability and describes a project which adopts one particular approach to achieving this goal: generate code in an existing widely-implemented language as output from the compiler. Pascal-F translates Pascal to F-code, an intermediate language which can be processed directly by any Standard FORTRAN compiler. The design of the F-code machine is treated in detail, and problems with the use of FORTRAN as a target language are discussed.
Electric-field control of a hydrogenic donor's spin in a semiconductor
Creators: name: De, A.
name: Pryor, Craig E.
name: Flatté, Michael E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An AC electric field applied to a donor-bound electron in a semiconductor modulates the orbital character of its wave function, which affects the electron's spin dynamics via the spin-orbit interaction. Numerical calculations of the spin dynamics of a hydrogenic donor (Si) embedded in GaAs, using a real-space multi-band k.p formalism, show the high symmetry of the hydrogenic donor state results in strongly nonlinear dependences of the electronic g tensor on applied fields. A nontrivial consequence is that the most rapid Rabi oscillations occur for electric fields modulated at a subharmonic of the Larmor frequency.
Fermi's golden rule and exponential decay as a RG fixed point
Creators: name: Langmann, E.
name: Lindblad, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss the decay of unstable states into a quasicontinuum using models of the effective Hamiltonian type. The goal is to show that exponential decay and the golden rule are exact in a suitable scaling limit, and that there is an associated renormalization group (RG) with these properties as a fixed point. The method is inspired by a limit theorem for infinitely divisible distributions in probability theory, where there is a RG with a Cauchy distribution, i.e. a Lorentz line shape, as a fixed point. Our method of solving for the spectrum is well known; it does not involve a perturbation expansion in the interaction, and needs no assumption of a weak interaction. We use random matrices for the interaction, and show that the ensemble fluctuations vanish in the scaling limit. Thus the limit is the same for every model in the ensemble with probability one.
description: 20 pages, 1 figure
Additional file 2 of Accelerated discovery of novel glycoside hydrolases using targeted functional profiling and selective pressure on the rumen microbiome
Creators: name: Neves, André L. A.
name: Yu, Jiangkun
name: Suzuki, Yutaka
name: Baez-Magana, Marisol
name: Arutyunova, Elena
name: O’Hara, Eóin
name: McAllister, Tim
name: Ominski, Kim H.
name: Lemieux, M. Joanne
name: Guan, Le Luo
Publisher: name: figshare
Year: 2021
Subjects: subject: Microbiology
subject: FOS: Biological sciences

description: Additional file 1: Fig. S1. Feed conversion ratio (FCR) and average daily gain (ADG) in bulls fed forage diets and divided into two groups of feed efficiency: 1) efficient or low feed conversion rate (L-FCR) and 2) inefficient or high-FCR (H-FCR). Fig. S2. Top 10 most abundant phyla detected in the rumen metatranscriptome of cattle fed forage-based diets. Fig. S3. Top 10 most abundant Level 2 functions detected in the rumen metatranscriptome of cattle fed forage-based diets. Fig. S4. Analysis of multivariate homogeneity of group dispersions between H-FCR and L-FCR. Fig. S5. Protozoa and fungi species identified in the rumen metatranscriptome according to the feed efficiency groups. Fig. S6. (A) Homology model of xylanases identified in the rumen microbiome aligns well with crystal structures of xylanases of the GH11 family. Fig. S7. (A) Homology model of xylanases and endoglucanases identified in the rumen microbiome bound to the predicted ligands. Table S1. Ingredient and chemical composition of the forage diet used in this study. Table S2. Details of the homology models predicted by I-TASSER. Amino acid sequences of the ten most abundant GH11 and GH45 enzymes identified in the rumen metatranscriptome. Table S3. Details of the homology models predicted by I-TASSER [3, 4].
Incorporating a Deep Neural Network into Moving Horizon Estimation for Embedded Thermal Torque Derating of an Electric Machine
Creators: name: Winkler, Alexander Emil Klaus
name: Shah, Pranav
name: Baumgärtner, Katrin
name: Sharma, Vasu
name: Gordon, David
name: Andert, Jakob
Publisher: name: RWTH Aachen University
Year: 2025

description: 18 Seiten (2025). doi:10.20944/preprints202503.1638.v1
Levy processes and Schroedinger equation
Creators: name: Petroni, Nicola Cufaro
name: Pusterla, Modesto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Probability (math.PR)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We analyze the extension of the well known relation between Brownian motion and Schroedinger equation to the family of Levy processes. We consider a Levy-Schroedinger equation where the usual kinetic energy operator - the Laplacian - is generalized by means of a selfadjoint, pseudodifferential operator whose symbol is the logarithmic characteristic of an infinitely divisible law. The Levy-Khintchin formula shows then how to write down this operator in an integro--differential form. When the underlying Levy process is stable we recover as a particular case the fractional Schroedinger equation. A few examples are finally given and we find that there are physically relevant models (such as a form of the relativistic Schroedinger equation) that are in the domain of the non-stable, Levy-Schroedinger equations.
description: 10 pages; changed the TeX documentclass; added references [21] and [22] and comments about them; changed definitions (11) and (12); added acknowledgments; small changes scattered in the text
Reverse Coherent Information
Creators: name: García-Patrón, Raúl
name: Pirandola, Stefano
name: Lloyd, Seth
name: Shapiro, Jeffrey H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this letter we define a family of entanglement distribution protocols assisted by feedback classical communication that gives an operational interpretation to reverse coherent information, i.e., the symmetric counterpart of the well known coherent information. This lead to the definition of a new entanglement distribution capacity that exceeds the unassisted capacity for some interesting channels.
description: Modification of the introduction to match the published manuscript
Chiral theory of $ρ$-meson gravitational form factors
Creators: name: Epelbaum, E.
name: Gegelia, J.
name: Meißner, U. -G.
name: Polyakov, M. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The low-energy chiral effective field theory of vector mesons and Goldstone bosons in external gravitational field is considered. The energy-momentum tensor is obtained and the gravitational form factors of the $ρ$-meson are calculated up to next-to-leading order in the chiral expansion. This amounts to considering tree-level and one-loop order diagrams. The chiral expansion of the form factors at zero momentum transfer as well as of the slope parameters is worked out. Also, the long-range behaviour of the energy and internal force distributions is obtained and analysed.
description: 11 pages, 1 figure
Enhanced Zeeman splitting in Ga0.25In0.75As quantum point contacts
Creators: name: Martin, T. P.
name: Szorkovszky, A.
name: Micolich, A. P.
name: Hamilton, A. R.
name: Marlow, C. A.
name: Linke, H.
name: Taylor, R. P.
name: Samuelson, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The strength of the Zeeman splitting induced by an applied magnetic field is an important factor for the realization of spin-resolved transport in mesoscopic devices. We measure the Zeeman splitting for a quantum point contact etched into a Ga0.25In0.75As quantum well, with the field oriented parallel to the transport direction. We observe an enhancement of the Lande g-factor from |g*|=3.8 +/- 0.2 for the third subband to |g*|=5.8 +/- 0.6 for the first subband, six times larger than in GaAs. We report subband spacings in excess of 10 meV, which facilitates quantum transport at higher temperatures.
description: [Version 2] Revtex4, 11 pages, 3 figures, accepted for publication in Applied Physics Letters
Twisted Covariant Noncommutative Self-dual Gravity
Creators: name: Estrada-Jimenez, S.
name: Garcia-Compean, H.
name: Obregon, O.
name: Ramirez, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A twisted covariant formulation of noncommutative self-dual gravity is presented. The formulation for constructing twisted noncommutative Yang-Mills theories is used. It is shown that the noncommutative torsion is solved at any order of the $θ$-expansion in terms of the tetrad and some extra fields of the theory. In the process the first order expansion in $θ$ for the Plebański action is explicitly obtained.
description: 23+1 pages, no figures, corrected typos, references and Appendix B is added
A converse to the Whitehead Theorem
Creators: name: Zusmanovich, Pasha
Publisher: name: arXiv
Year: 2008
Subjects: subject: Rings and Algebras (math.RA)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 17B56

description: We show that finite-dimensional Lie algebras over a field of characteristic zero such that their high-degree cohomology in any finite-dimensional non-trivial irreducible module vanishes, are, essentially, direct sums of semisimple and nilpotent algebras.
description: AMS-LaTeX; v3: fixed a typo
Damped wave equations with dynamic boundary conditions
Creators: name: Mugnolo, Delio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47D06; 35L20

description: We discuss several classes of linear second order initial-boundary value problems, where damping terms appear in the main wave equation as well as in the dynamic boundary condition. We investigate their well-posedness and describe some qualitative properties of their solutions, including boundedness, stability, or almost periodicity. In particular, we are able to characterize the analyticity of certain $C_0$-semigroups associated to such problems. Applications to several problems on domains and networks are shown.
Size dependent motion of nanodroplets on chemical steps
Creators: name: Moosavi, A.
name: Rauscher, M.
name: Dietrich, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Nanodroplets on chemically structured substrates move under the action of disjoining pressure induced forces. A detailed analysis of them shows that even in the absence of long-ranged lateral variations of the effective interface potential, already the fact, that due their small size nano-droplets do not sample the disjoining pressure at all distances from the substrate, can lead to droplet motion towards the less wettable part of the substrate, i.e., in the direction opposite to the one expected on the basis of macroscopic wettability considerations.
description: 13 pages, 4 figures
Thyrididae Herrich-Schaeffer 1846
Creators: name: Pohl, Greg
name: Anweiler, Gary
name: Schmidt, Christian
name: Kondla, Norbert
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Thyrididae

description: 47. Thyrididae – window-winged moths Small to medium-sized (12–42 mm wingspan) moths with dark wings that have uneven margins and translucent spots. Larvae are borers or gall makers, or feed from within rolled or tied leaves. Approximately 760 species of Th yrididae are known worldwide, primarily in tropical and subtropical areas. Ten species are known in North America; one of these has recently been collected in AB. No recent revisions exist for the group, but the AB species can be found in Covell (1984).
description: Published as part of Pohl, Greg, Anweiler, Gary, Schmidt, Christian & Kondla, Norbert, 2010, An annotated list of the Lepidoptera of Alberta, Canada, pp. 1-549 in ZooKeys 38 (38) on page 162, DOI: 10.3897/zookeys.38.383, http://zenodo.org/record/576629
description: {"references": ["Covell CV Jr (1984) A field guide to moths of eastern North America. Houghton Mifflin, Boston, MA, Peterson Field Guide Series No. 30, 496 pp."]}
Spread Codes and Spread Decoding in Network Coding
Creators: name: Manganiello, Felice
name: Gorla, Elisa
name: Rosenthal, Joachim
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper we introduce the class of Spread Codes for the use in random network coding. Spread Codes are based on the construction of spreads in finite projective geometry. The major contribution of the paper is an efficient decoding algorithm of spread codes up to half the minimum distance.
Analysis of Hybrid Gas-Dust Outbursts Observed at 67P/Churyumov-Gerasimenko
Creators: name: Noonan, John W.
name: Rinaldi, Giovanna
name: Feldman, Paul D.
name: Stern, S. Alan
name: Parker, Joel Wm.
name: Keeney, Brian A.
name: Bockelée-Morvan, Dominique
name: Vervack, Ronald J.
name: Steffl, Andrew J.
name: Knight, Matthew M.
name: Schindhelm, Rebecca N.
name: Feaga, Lori M.
name: Pineau, Jon
name: Medina, Richard
name: Weaver, Harold A.
name: Bertaux, Jean-Loup
name: A'Hearn, Michael F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Cometary outbursts offer a valuable window into the composition of comet nuclei with their forceful ejection of dust and volatiles in explosive events, revealing the interior components of the comet. Understanding how different types of outbursts influence the dust properties and volatile abundances to better interpret what signatures can be attributed to primordial composition and what features are the result of processing is an important task best undertaken with a multi-instrument approach. The European Space Agency \textit{Rosetta} mission to 67P/Churyumov-Gerasimenko carried a suite of instruments capable of carrying out this task in the near-nucleus coma with unprecedented spatial and spectral resolution. In this work we discuss two outbursts that occurred November 7 2015 and were observed by three instruments on board: the Alice ultraviolet spectrograph, the Visual Infrared and Thermal Imaging Spectrometer (VIRTIS), and the Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS). Together the observations show that mixed gas and dust outbursts can have different spectral signatures representative of their initiating mechanisms, with the first outburst showing indicators of a cliff collapse origin and the second more representative of fresh volatiles being exposed via a deepening fracture. This analysis opens up the possibility of remote spectral classification of cometary outbursts with future work.
description: 26 pages, 16 figures, 4 tables