cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Supplementary document for At-Focus Scanning Ptychography for High Resolution Imaging with a Wide Field of View - 6719937.pdf
Creators: name: Ivanic, Bojana
name: Barolak, Jonathan
name: Car, Christopher
name: Clarke, Cameron
name: Goldberger, David
name: Goeckeritz, Jeremy
name: Meier, Amanda
name: Adams, Daniel
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplementary document supporting the main manuscript. The .zip files contains the default Optica Latex template files, main text document, and figures.
Anisotropic Penetration Depths of Corner States in a Higher-Order Topological Insulator
Creators: name: Arai, Nobuhiro
name: Murakami, Shuichi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Higher-order topological insulators in two dimensions have states that localize at their corners, called corner states. In this paper, we reveal characteristics of the penetration depth of their corner states by using the Benalcazar-Bernevig-Hughes model. First, we show that when we change the energy of the corner states toward the end of the edge gap by adding an on-site potential to the corner site, the penetration depth along the edge diverges toward infinity while the penetration depth into the bulk remaining finite. We analytically derive the corner-state wavefunction in a form of elliptic integrals, which reproduces this anisotropic behavior of corner states. This means that corner states have two kinds of penetration depths, and they behave differently. At last, we show that hybridizations between corner states are governed by the penetration depth through interference between the corner states. It is because the corner states almost do not interfere with edge states or bulk states.
description: 11 pages, 6 figures
Exploring Graduate International Students' Sense of Belonging in Canadian Higher Education  Institutions
Creators: Fatemeh Mirikarbasaki
Publisher: name: University of Alberta Library
Year: 2023

As the number of international students in Canada continues to rise, understanding and addressing the challenges associated with their sense of belonging becomes paramount. This paper, authored by an international student and instructor, explores the intricate emotions and perceptions surrounding the sense of belonging within the Canadian higher education sector. Utilizing Maslow's theoretical framework of belongingness, the study aims to comprehensively unravel the origins and manifestations of these feelings, shedding light on their impact on academic performance and social integration. This research aims to contribute to a deeper understanding of the experiences and needs of international students, advocating for the creation of an inclusive and supportive academic environment in Canada. By identifying and addressing the factors influencing a sense of belonging, the paper seeks to enhance the academic success and holistic well-being of international students, ultimately fostering a community where every student feels connected and valued.
Crystal rotation during alloy heating
Creators: name: Liang, Zhida
name: Maawad, Emad
name: Pyczak, Florian
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Over past decades, high energy X-ray diffraction techniques at synchrotron beamline offer us the unique possibility to follow concomitantly some mechanisms on the grain level in metallic materials. Crystal rotation, as one important factor for the crystal orientation distribution, usually influences the anisotropic properties of materials. Crystal rotation has been visualized in deformation, recrystallization, and chemical reaction processes. In this study, we firstly visualized an unexpected crystal rotation during heating up of superalloys as well by in situ 3DXRD scanning microscopy which has not been previously reported yet. The crystal rotation was found to be related to the locked-in first order residual strain relief during the annealing treatment. In addition, intermittent dynamic, i.e., some individual diffraction spots from Debye-Scherrer rings appearing, disappearing, and reappearing, occurred in this study which has ever been thought to be caused by subgrain formation in deformation experiments. However, by residual strain analysis coupled with finite element simulation, we found that the intermittent dynamic is married with thermal expansion, crystal distortion, and crystal rotation as well. This finding opens a new world for deeply understanding the residual strain relief during materials, particularly metal, heating.
Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs
Creators: name: Qiu, Y.
name: Kofu, M.
name: Bao, Wei
name: Lee, S. -H.
name: Huang, Q.
name: Yildirim, T.
name: Copley, J. R. D.
name: Lynn, J. W.
name: Wu, T.
name: Wu, G.
name: Chen, X. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The newly discovered superconductor La(O,F)FeAs (Tc = 26 K) was investigated using the neutron scattering technique. No spin-density-wave (SDW) order was observed in the normal state nor in the superconducting state, both with and without an applied magnetic field of 9 T, consistent with the proposal that SDW and superconductivity are competing in the laminar materials. While our inelastic measurements offer no constraints on the spin dynamic response from d-wave pairing, an upper limit for the magnetic resonance peak predicted from an extended s-wave pairing mechanism is provided. Our measurements also support the energy scale of the calculated phonon spectrum which is used in electron-phonon coupling theory, and fails to produce the high observed Tc.
description: 4 pages, 4 figures
Extreme high lattice-misfit superalloys with regular cubic L12 particles and excellent creep resistance
Creators: name: Liang, Zhida
name: Stark, Andreas
name: Pyczak, Florian
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024

description: In novel Co and CoNi based superalloys, the creep resistance is limited at high temperatures due to low lattice misfit and solvus temperature. In this study, we combined the advantages of Co-Ti (high lattice misfit and solvus temperature) and Co-Al based superalloys (cuboidal precipitates) by using Ti to substitute Al in alloys of Co-30Ni-(12.5-x)Al-xTi-2.5Mo-2.5W (at.%) composition. With high Ti content, the alloys obtained extreme high lattice misfit (bigger than 1.3 %) and solvus temperature (bigger than 1150 degree). During aging at 900 degree, alloys with high Ti/Al ratio exhibited a lower gamma prime precipitate coarsening rate resulting from their lower gamma prime and gamma interfacial energy and higher lattice misfit. In addition, high Ti/Al ratio brought higher gamma prime volume fraction and excellent mechanical properties, such as higher yield stress and better creep resistance. However, at high temperature of 1100 degree, the cubic gamma prime phase was decomposed into deleterious Eta phase with D024 structure if the Ti/Al ratio exceeded 1. Based on this, we outreached new alloys design with a high content of Cr and Ta and appropriate Ti/Al ratio, i.e., Ti/Al ratio is smaller than 1. The newly designed alloys still have high solvus temperature (bigger than 1200 degree) and exhibit high lattice misfit (bigger than 1.2 %) as Co-12Ti (at.%) superalloys but more regular cubic gamma prime precipitates and significantly better creep resistance than superalloys Co-9Al-9W and Co-9Al-9W-2Ti at 850 and 950 degree. Nevertheless, compared with creep resistance of Ni based superalloys, our newly designed alloys still need to be further improved, especially in the 1000 and 1050 degree range.
Multi-wavelength and Dual-perspective Observations of Eruption and Untwisting of Two Homologous Magnetic Flux Ropes
Creators: name: Song, De-Chao
name: Li, Y.
name: Su, Y.
name: Ding, M. D.
name: Gan, W. Q.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper, we present a detailed morphological, kinematic, and thermal analysis of two homologous magnetic flux ropes (MFRs) from NOAA 11515 on 2012 July 8--9. The study is based on multi-wavelength and dual-perspective imaging observations from the Solar Dynamics Observatory and the Solar Terrestrial Relations Observatory Ahead spacecraft, which can well reveal the structure and evolution of the two MFRs. We find that both of the MFRs show up in multiple passbands and their emissions mainly consist of a cold component peaking at a temperature of $\sim$0.4--0.6 MK and a hot component peaking at $\sim$7--8 MK. The two MFRs exhibit erupting, expanding, and untwisting motions that manifest distinctive features from two different viewpoints. Their evolution can be divided into two stages, a fast-eruption stage with speeds of about 105--125 km s$^{-1}$ for MFR-1 and 50--65 km s$^{-1}$ for MFR-2 and a slow-expansion (or untwisting) stage with speeds of about 10--35 km s$^{-1}$ for MFR-1 and 10--30 km s$^{-1}$ for MFR-2 in the plane of sky. We also find that during the two-stage evolution, the high temperature features mainly appear in the interface region between MFRs and ambient magnetic structures and also in the center of MFRs, which suggests that some heating processes take place in such places like magnetic reconnection and plasma compression. These observational results indicate that the eruption and untwisting processes of MFRs are coupled with the heating process, among which an energy conversion exists.
description: 24 pages, 10 figures, 1 table
A complex-angle rotation and geometric complementarity in fermion mixing
Creators: name: Nam, Kee-Hwan
name: Siyeon, Kim
name: Hwang, Seungsu
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The mixing among flavors in quarks or leptons in terms of a single rotation angle is defined such that three flavor eigenvectors are transformed into three mass eigenvectors by a single rotation about a common axis. We propose that a geometric complementarity condition exists between the complex angle of quarks and that of leptons in $\mathbb{C}^2$ space. The complementarity constraint has its rise in quark-lepton unification and is reduced to the correlation among $θ_{12}, θ_{23}, θ_{13}$ and the CP phase $δ$. The CP phase turns out to have a non-trivial dependence on all the other angles. We will show that further precise measurements in real angles can narrow down the allowed region of $δ$. In comparison with other complementarity schemes, this geometric one can avoid the problem of the $θ_{13}$ exception and can naturally keep the lepton basis being independent of quark basis.
description: 9 pages, 4 figures, APPC 10 Pohang
Mapping the Morphology and Kinematics of a Lyman-alpha-selected Nebula at z=3.15 with MUSE
Creators: name: Sanderson, Kelly N.
name: Prescott, Moire K. M.
name: Christensen, Lise
name: Fynbo, Johan
name: Møller, Palle
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent wide-field integral field spectroscopy has revealed the detailed properties of high redshift Lyman-alpha (Lya) nebulae, most often targeted due to the presence of an active galactic nucleus (AGN). Here, we use VLT/MUSE to resolve the morphology and kinematics of a nebula initially identified due to strong Lya emission at $z\sim3.2$ (LABn06; Nilsson et al. 2006). Our observations reveal a two-lobed Lya nebula, at least $\sim$173 pkpc in diameter, with a light-weighted centroid near a mid-infrared source (within $\approx$17.2 pkpc) that appears to host an obscured AGN. The Lya emission near the AGN is also coincident in velocity with the kinematic center of the nebula, suggesting that the nebula is both morphologically and kinematically centered on the AGN. Compared to AGN-selected Lya nebulae, the surface brightness profile of this nebula follows a typical exponential profile at large radii ($>$25 pkpc), although at small radii, the profile shows an unusual dip at the location of the AGN. The kinematics and asymmetry are similar to, and the CIV and HeII upper limits are consistent with other AGN-powered Lya nebulae. Double-peaked and asymmetric line profiles suggest that Lya resonant scattering may be important in this nebula. These results support the picture of the AGN being responsible for powering a Lya nebula that is oriented roughly in the plane of the sky. Further observations will explore whether the central surface brightness depression is indicative of either an unusual gas or dust distribution or variation in the ionizing output of the AGN over time.
description: 19 pages, 9 figures, 2 tables, accepted to ApJ
The Quality Improvement in Electronic Welding Process : A Case Study of Electronic Component Factory
Creators: name: Titaporn Poophangjai
name: Porntep Khokhajaikiat
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2012
Subjects: Incomplete welding on the side, flux D, flux E, welding process.

description: 2, 39, KKU Engineering Journal
A management plan for the University of British Columbia Research Forest
Creators: name: Sanders, Peter R. W.
Publisher: name: University of British Columbia
Year: 2010

description: The Management Plan (1981) for U.B.C. Research Forest consists of four parts: a description of the Estate (PART I), a current management section (PART II), maps, figures and tables, and finally, the appendices and supporting material. The Management Plan has a "rolling" format, Year 1 of the Plan is complete with detailed prescriptions and costs, Year 2 in relatively fine detail, Year 3-5 in more general terms, Year 6-10 broadly outlined, and Year 11+ used for "crystal ball" projections. PART II of the Plan is revised annually, the entire Plan at 5 year intervals. Only one appendix (the index to the Central Filing System) is included in its entirety. Due to the bulk of the other appendices, only the header sheets are included with the Plan, the information being held in the Central Filing System at U.B.C. Research Forest. Using the one complete appendix, any information pertaining to U.B.C. Research Forest can be found. A prime objective of planning is to ensure continuity of management intent. The Management Plan of the U.B.C. Research Forest has the format, and the information base required to fulfil the objective.
Stephen Dedalus and the Astro-Artistic Mentality: Ulysses as Creation Ex Nihilo
Creators: name: Spina, Kaitlyn
Publisher: name: University of Chicago
Year: 2019
Subjects: subject: Joyce, James
subject: Stephen Dedalus
subject: Literary modernism
subject: Ulysses
subject: Portrait of the Artist as a Young Man

description: n/a
6.7 GHz methanol absorption toward the Seyfert 2 galaxy NGC 3079
Creators: name: Impellizzeri, C. M. V.
name: Henkel, C.
name: Roy, A. L.
name: Menten, K. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The detection of the 6.7 GHz line of methanol (CH3OH) is reported for the first time toward an object beyond the Magellanic Clouds. Using the Effelsberg 100 m telescope, two absorption features were identified toward the Seyfert 2 galaxy NGC 3079. Both components probably originated on lines-of-sight toward the central region, presumably absorbing the radio continuum of the nuclear sources A, B, and E of NGC 3079. One absorption feature, at the systemic velocity, is narrow and may arise from gas not related to the nuclear environment of the galaxy. The weaker blue-shifted component is wider and may trace outflowing gas. Total A-type CH3OH column densities are estimated to be between a few times 10^13 and a few times 10^15 cm^-2. Because of a highly frequency-dependent continuum background, the overall similarity of HI, OH, and CH3OH absorption profiles hints at molecular clouds that cover the entire area occupied by the nuclear radio continuum sources ~ 4 pc.
description: 4 pages, 1 figure, accepted for publication in A&A Letters
Development of Scrap Cost Forecasting Model: A Case Study in Hard Disk Drive Company
Creators: name: Phattarasaya Tantiwattanakul
name: Athakorn Kengpol
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2012
Subjects: Forecasting, Correlation analysis, Regression analysis, Artificial neural networks

description: 3, 39, KKU Engineering Journal
Some methods of sampling triangle based probability polygons for forestry applications
Creators: name: Errico, Darrell
Publisher: name: University of British Columbia
Year: 2010

description: There is interest in forest sampling methods which have the ability to provide reliable estimates of volume without incurring unreasonable costs. Fraser (1977), to this end, described an individual tree variable probability sampling method which selects sample trees with probabilities based on the areas of polygons derived from triangles. A comparison of some alternative methods of sampling these polygons confirms Fraser's work and demonstrates that the method proposed by him probably has the greatest potential for practical forest sampling.
Uniform rectifiability, Calderon-Zygmund operators with odd kernel, and quasiorthogonality
Creators: name: Tolsa, Xavier
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 28A75; 42B20

description: In this paper we study some questions in connection with uniform rectifiability and the $L^2$ boundedness of Calderon-Zygmund operators. We show that uniform rectifiability can be characterized in terms of some new adimensional coefficients which are related to the Jones' $β$ numbers. We also use these new coefficients to prove that n-dimensional Calderon-Zygmund operators with odd kernel of type $C^2$ are bounded in $L^2(μ)$ if $μ$ is an n-dimensional uniformly rectifiable measure.
description: 34 pages
Nuclear structure of Ac-231
Creators: name: Boutami, R.
name: Borge, M. J. G.
name: Mach, H.
name: Kurcewicz, W.
name: Fraile, L. M.
name: Gulda, K.
name: Aas, A. J.
name: García-Raffi, L. M.
name: Løvhøiden, G.
name: Martínez, T.
name: Rubio, B.
name: Taín, J. L.
name: Tengblad, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.
Accurate Quasinormal Modes of the Five-Dimensional Schwarzschild-Tangherlini Black Holes
Creators: name: Matyjasek, Jerzy
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The objective of this paper is to construct the accurate (say, to 11 decimal places) frequencies of the quasinormal modes of the 5-dimensional Schwarzschild-Tangherlini black hole using three major techniques: the Hill determinant method, the continued fractions method and the WKB-Padé method and to discuss the limitations of each. It is shown that for the massless scalar, gravitational tensor, gravitational vector and electromagnetic vector perturbations considered in this paper, the Hill determinant method and the method of continued fractions (both with the convergence acceleration) always give identical results, whereas the WKB-Padé method gives the results that are amazingly accurate in most cases. Notable exception are the gravitational vector perturbations ($j =2$ and $\ell = 2 $), for which the WKB-Padé approach apparently does not work. Here we have interesting situation in which the WKB-based methods (WKB-Padé and WKB-Borel-Le Roy) give the complex frequency that differs from the from the result obtained within the framework of the continued fraction method and the Hill determinant method. For the fundamental mode, deviation of the real part of frequency from the exact value is $0.5\%$ whereas the deviation of the imaginary part is $2.7\%.$ For $\ell \geq 3$ the accuracy of the WKB results is similar again to the accuracy obtained for other perturbations. The case of the gravitational scalar perturbations is briefly discussed.
Selected Items in Jet Algorithms
Creators: name: Bozzi, Giuseppe
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I provide a very brief overview of recent developments in jet algorithms, mostly focusing on the issue of infrared-safety.
description: 3 pages. Talk given at IFAE 2008, Bologna, Italy, 26-28 March 2008
Synthetic Spectra and Colors of Young Giant Planet Atmospheres: Effects of Initial Conditions and Atmospheric Metallicity
Creators: name: Fortney, Jonathan J.
name: Marley, Mark S.
name: Saumon, Didier
name: Lodders, Katharina
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the spectra and infrared colors of the cool methane-dominated atmospheres at Teff < 1400 K expected for young gas giant planets. We couple these spectral calculations to an updated version of the Marley et al. (2007) giant planet thermal evolution models that include formation by core accretion-gas capture. These relatively cool "young Jupiters" can be 1-6 magnitudes fainter than predicted by standard cooling tracks that include a traditional initial condition, which may provide a diagnostic of formation. If correct, this would make true Jupiter-like planets much more difficult to detect at young ages than previously thought. Since Jupiter and Saturn are of distinctly super-solar composition, we examine emitted spectra for model planets at both solar metallicity and a metallicity of 5 times solar. These metal-enhanced young Jupiters have lower pressure photospheres than field brown dwarfs of the same effective temperatures arising from both lower surface gravities and enhanced atmospheric opacity. We highlight several diagnostics for enhanced metallicity. A stronger CO absorption band at 4.5 $μ$m for the warmest objects is predicted. At all temperatures, enhanced flux in $K$ band is expected due to reduced collisional induced absorption by H$_2$. This leads to correspondingly redder near infrared colors, which are redder than solar metallicity models with the same surface gravity by up to 0.7 in $J-K$ and 1.5 in $H-K$. Molecular absorption band depths increase as well, most significantly for the coolest objects. We also qualitatively assess the changes to emitted spectra due to nonequilibrium chemistry.
description: Accepted to ApJ. Most figures in color
Self-Regulated Fueling of Galaxy Centers: Evidence for Star-Formation Feedback in IC342's Nucleus
Creators: name: Schinnerer, E.
name: Boeker, T.
name: Meier, D. S.
name: Calzetti, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using new, high-resolution interferometric observations of the CO and HCN molecules, we directly compare the molecular and ionized components of the interstellar medium in the center of the nearby spiral galaxy IC342, on spatial scales of ~ 10pc. The morphology of the tracers suggests that the molecular gas flow caused by a large-scale stellar bar has been strongly affected by the mechanical feedback from recent star formation activity within the central 100pc in the nucleus of the galaxy. Possibly, stellar winds and/or supernova shocks originating in the nuclear star cluster have compressed, and likely pushed outward, the infalling molecular gas, thus significantly reducing the gas supply to the central 10pc. Although our analysis currently lacks kinematic confirmation due to the face-on orientation of IC342, the described scenario is supported by the generally observed repetitive nature of star formation in the nuclear star clusters of late-type spiral galaxies.
description: 7 pages, 3 figures, accepted for publication in ApJ Letters
title: U.S. Utility-Scale Wind Turbine Nacelle Production and Trade
Creators: name: David, Andrew
Publisher: name: United States International Trade Commission
publisherIdentifier: https://ror.org/05hsggr76
publisherIdentifierScheme: ROR
Year: 2022

description: This paper examines the evolution of U.S. wind turbine nacelle manufacturing and trade from 2012 to
2020. The results of this analysis indicate that the U.S. wind turbine nacelle manufacturing industry
contracted starting in mid-2012, with ten nacelle plants closing during 2012–20. The three largest
suppliers, however, maintained nacelle plants and by 2020 U.S. production capacity had rebounded to
close to (by number of turbines) or above (by megawatts) 2012 levels. This production supplies most of
the domestic market, but the reduction in the number of firms did lead to more reliance on imports in
some years. In 2020, amid high demand, U.S. imports significantly increased as some firms did not have
enough U.S. production capacity to meet demand and firms without U.S. production gained sales. The
share of the market accounted for by imports in 2020 exceeded 30 percent on a megawatt basis and
was about 25 percent on a value basis. Further, there is little available capacity to supply export markets
and U.S. exports have sharply dropped from their 2014 peak.
A High-Velocity Scatterer Revealed in the Thinning Ejecta of a Type II Supernova
Creators: name: Leonard, Douglas C.
name: Dessart, Luc
name: Hillier, D. John
name: Pignata, Giuliano
name: Williams, G. Grant
name: Hoffman, Jennifer L.
name: Milne, Peter
name: Smith, Nathan
name: Smith, Paul S.
name: Khandrika, Harish G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present deep, nebular-phase spectropolarimetry of the Type II-P/L SN 2013ej, obtained 167 days after explosion with the European Southern Observatory's Very Large Telescope. The polarized flux spectrum appears as a nearly perfect (92% correlation), redshifted (by ~4,000 km/sec) replica of the total flux spectrum. Such a striking correspondence has never been observed before in nebular-phase supernova spectropolarimetry, although data capable of revealing it have heretofore been only rarely obtained. Through comparison with 2D polarized radiative transfer simulations of stellar explosions, we demonstrate that localized ionization produced by the decay of a high-velocity, spatially confined clump of radioactive 56-Ni -- synthesized by and launched as part of the explosion with final radial velocity exceeding 4,500 km/sec -- can reproduce the observations through enhanced electron scattering. Additional data taken earlier in the nebular phase (day 134) yield a similarly strong correlation (84%) and redshift, whereas photospheric-phase epochs that sample days 8 through 97, do not. This suggests that the primary polarization signatures of the high-velocity scattering source only come to dominate once the thick, initially opaque hydrogen envelope has turned sufficiently transparent. This detection in an otherwise fairly typical core-collapse supernova adds to the growing body of evidence supporting strong asymmetries across Nature's most common types of stellar explosions, and establishes the power of polarized flux -- and the specific information encoded by it in line photons at nebular epochs -- as a vital tool in such investigations going forward.
description: Accepted for publication in The Astrophysical Journal Letters
A thermodynamic approach to the relaxation of viscosity and thermal conductivity
Creators: name: Bíró, T. S.
name: Molnár, E.
name: Ván, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A novel higher order theory of relaxation of heat and viscosity is proposed based on corrections to the traditional treatment of the relativistic energy density. In the framework of generalized Bjorken scaling solution to accelerating longitudinal flow we point out that the energy flux can be consequently set to zero in the stationary case, independently of the choice of a specific local rest frame, like the Landau-Lifshitz or Eckart one. We investigate and compare several cooling and re-heating scenarios for the Quark Gluon Plasma (QGP) within this approach.
description: 13 pages, 4 figures
Effects of Coriolis force on the nonlinear interactions of acoustic-gravity waves in the atmosphere
Creators: name: Chatterjee, Debjani
name: Misra, A. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The nonlinear theory of acoustic-gravity waves (AGWs) in the atmosphere is revisited with the effects of the Coriolis force. Previous theory in the literature [Phys. Scr. \textbf{90} (2015) 055001] is advanced. Starting from a set of fluid equations modified by the Coriolis force, a general linear dispersion relation is derived which manifests the coupling of the high-frequency acoustic-gravity waves (AGWs) and the low-frequency internal gravity waves (IGWs). The frequency of IGWs is enhanced by the Earth's angular velocity. The latter also significantly modifies the nonlinear coupling of AGWs and IGWs whose evolutions are described by the Zakharov approach as well as the Wigner-Moyal formalism. The consequences of AGWs and the two equivalent evolution equations modified by the Coriolis force are briefly discussed.
description: 6 pages; to appear in Journal of Atmospheric and Solar-Terrestrial Physics (2021)
Comparing CN and CH Line Strengths in a Homogeneous Spectroscopic Sample of 8 Galactic Globular Clusters
Creators: name: Kayser, Andrea
name: Hilker, Michael
name: Grebel, Eva K.
name: Willemsen, Philip G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Our work focuses on the understanding of the origin of CNO-anomalies, which have been detected in several Galactic globular clusters (GCs). This study is based on a homogeneous data set of hundreds of medium resolution spectra of stars in eight GCs. Two of the clusters are believed to be former members of the Sagittarius dSph galaxy. Our sample comprises stars in different evolutionary states, namely the main sequence turn-off (MSTO) region, the subgiant branch (SGB), and the base of the red giant branch (RGB). We compare the relative CN and CH line strengths of stars in the same evolutionary states. The majority of the examined clusters show significant variations in their CN and CH abundances at the base of the RGB. The two former Sgr dSph clusters do not exhibit any CN-strong stars. Our results suggest that the environment in which the clusters influences existence of CN-strong stars. We confirm the known anticorrelation between CN and CH for most of the observed GCs. Although the signal of CN absorption is weaker for the hotter stars on the MSTO and SGB we observed the same anticorrelation in these less evolved stars for the CN-bimodal clusters. The inclusion of structural parameters taken from literature reveals that the existence of the CN-bifurcation seems to be independent of most other cluster characteristics. In particular, we do not confirm the correlation between cluster ellipticity and number of CN-strong stars. However, there may be a trend of an increased percentage of CN-strong stars with increasing cluster tidal radius and total luminosity. We argue that our findings are consistent with pollution by intermediate AGB stars and/or fast rotating massive stars and two generations of star formation in luminous clusters with larger tidal radii at larger Galactocentric distances.
description: 17 pages, 11 figures, accepted for publication in Astronomy and Astrophysics
A discrete element study of settlement in vibrated granular layers: role of contact loss and acceleration
Creators: name: Karrech, Ali
name: Duhamel, Denis
name: Bonnet, Guy
name: Chevoir, François
name: Roux, Jean-Noel
name: Canou, Jean
name: Dupla, Jean-Claude
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: This paper deals with the vibration of granular materials due to cyclic external excitation. It highlights the effect of the acceleration on the settlement speed and proves the existence of a relationship between settlement and loss of contacts in partially confined granular materials under vibration. The numerical simulations are carried out using the Molecular Dynamics method, where the discrete elements consist of polygonal grains. The data analyses are conducted based on multivariate autoregressive models to describe the settlement and permanent contacts number with respect to the number of loading cycles.
Beating patterns of filaments in viscoelastic fluids
Creators: name: Fu, Henry C.
name: Wolgemuth, Charles W.
name: Powers, Thomas R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Many swimming microorganisms, such as bacteria and sperm, use flexible flagella to move through viscoelastic media in their natural environments. In this paper we address the effects a viscoelastic fluid has on the motion and beating patterns of elastic filaments. We treat both a passive filament which is actuated at one end, and an active filament with bending forces arising from internal motors distributed along its length. We describe how viscoelasticity modifies the hydrodynamic forces exerted on the filaments, and how these modified forces affect the beating patterns. We show how high viscosity of purely viscous or viscoelastic solutions can lead to the experimentally observed beating patterns of sperm flagella, in which motion is concentrated at the distal end of the flagella.
Mécanique de l'efficacité symbolique
Creators: name: VOGLER, Pierre
Publisher: name: Zenodo
Year: 2023

description: Les procédures de l'efficacité symbolique, omniprésentes dans les cultures traditionnelles, sont comme cachées par le caractère foisonnant des exemples et des commentaires théoriques. On peut cependant partir du point de vue qu'elles relèvent de constantes pour peu qu'on ne s'attache pas à la variabilité des termes ou à celle des fonctions sociales. Cet article s'attache à dégager les traits communs aux formules en cause, traduisant l'existence d'une réalité universelle.
Experimental and theoretical studies of sequence effects on the fluctuation and melting of short DNA molecules
Creators: name: Peyrard, Michel
name: Cuesta-Lopez, Santiago
name: Angelov, Dimitar
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Understanding the melting of short DNA sequences probes DNA at the scale of the genetic code and raises questions which are very different from those posed by very long sequences, which have been extensively studied. We investigate this problem by combining experiments and theory. A new experimental method allows us to make a mapping of the opening of the guanines along the sequence as a function of temperature. The results indicate that non-local effects may be important in DNA because an AT-rich region is able to influence the opening of a base pair which is about 10 base pairs away. An earlier mesoscopic model of DNA is modified to correctly describe the time scales associated to the opening of individual base pairs well below melting, and to properly take into account the sequence. Using this model to analyze some characteristic sequences for which detailed experimental data on the melting is available [Montrichok et al. 2003 Europhys. Lett. {\bf 62} 452], we show that we have to introduce non-local effects of AT-rich regions to get acceptable results. This brings a second indication that the influence of these highly fluctuating regions of DNA on their neighborhood can extend to some distance.
description: To be published in J. Phys. Condensed Matter
The Fourcade-Figueroa galaxy: a clearly disrupted superthin edge-on galaxy
Creators: name: Saponara, J.
name: Kamphuis, P.
name: Koribalski, B. S.
name: Benaglia, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Studies of the stellar and the HI gas kinematics in dwarf and Low Surface Brightness (LSB) galaxies are essential for deriving constraints on their dark matter distribution. Moreover, a key component to unveil in the evolution of LSBs is why some of them can be classified as superthin. We aim to investigate the nature of the proto-typical superthin galaxy Fourcade-Figueroa (FF), to understand the role played by the dark matter halo in forming its superthin shape and to investigate the mechanism that explains the observed disruption in the approaching side of the galaxy. Combining new HI 21-cm observations obtained with the Giant Metrewave Radio Telescope with archival data from the Australia Telescope Compact Array we were able to obtain sensitive HI observations of the FF galaxy. These data were modeled with a 3D tilted ring model in order to derive the rotation curve and surface brightness density of the neutral hydrogen. We subsequently used this model, combined with a stellar profile from the literature, to derive the radial distribution of the dark matter in the FF galaxy. For the FF galaxy the Navarro-Frenk-White dark matter distribution provides the best fit to the observed rotation curve. However, the differences with a pseudo-isothermal halo are small. Both models indicate that the core of the dark matter halo is compact. Even though the FF galaxy classifies as superthin, the gas thickness about the galactic centre exhibits a steep flaring of the gas which is in agreement with the edge of the stellar disk. As suggested previously in the literature, the compact dark matter halo might be the main responsible for the superthin structure of the stellar disk in FF. This idea is strengthened through the detection of the mentioned disruption; the fact that the galaxy is disturbed also seems to support the idea that it is not isolation that cause its superthin structure.
description: 10 pages, 10 figures
Measurements of ttbar production cross-section with D0 experiment
Creators: name: Shary, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The recent measurements of the top anti-top quark pair production cross-section in proton antiproton collisions at sqrt{s}=1.96 TeV in lepton + jets and dilepton (including tau lepton) channels are presented. These measurements are based on 1 fb^{-1} of data collected with the DO experiment at the Fermilab Tevatron collider. The measured values are compatible with the standard model prediction and have the uncertainty close to the uncertainty of the theoretical prediction ~10%.
description: Presented at the International workshop on Top Quark Physics
Economic feasibility study: integrated industrial complex for the utilizatiion of aspen, birch and cottonwood in northeastern British Columbia
Creators: name: Sourial, Farag Anis
Publisher: name: University of British Columbia
Year: 2010

description: The feasibility of utilizing the aspen, birch and cottonwood stands which are found in large volumes in northeastern British Columbia was investigated. The study included raw material analysis, plant design of five integrated production lines, market study and model of investment. The integrated complex was designed to produce aspen and cottonwood dried veneer with an annual capacity of 70 000 m³, 3 mm thick, 13 500 m³/year of sliced - dried birch face veneer, 0.8 mm thick, 40 billion splints for match manufacture, 10 000t of pelle- tized aspen bark and 50 GJh of thermal energy. The aspen, cottonwood and birch veneer production was chosen because of its higher profitability than other products and its market potentials. The residue utilizing lines were included to add manufacturing values in addition to the main products. The complex is expected to consume 140 000 m³ of aspen and cottonwood and 30 000 m³ of white birch yearly. This volume is considered a fraction of the species annual allowable cut in the Fort Nelson Forest Unit. A total capital investment of $29 373 000 is required; of which $17 083 000 would be for fixed investment and $12 290 000 for annual operating cost. The expected after tax profit on investment would be $10 910 000/year, based on annual sales of $3k million. Projected annual return on investment is expected to reach 6k% of the fixed investment with a payout of 1.6 years. Sixty eight tables and 1+9 figures in addition to plant layout for the entire integrated industrial complex are included in the study as illustrating material.
Giant magnons in TsT-transformed AdS_5 x S^5
Creators: name: Bykov, Dmitri V.
name: Frolov, Sergey
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider giant magnons propagating in a γ-deformed AdS_5 x S^5 background obtained from AdS_5 x S^5 by means of a chain of TsT transformations. We point out that in the light-cone gauge and in the infinite J limit the deformed and undeformed string models share the same magnon dispersion relation, the \su(2|2)\oplus \su(2|2)-invariant world-sheet S-matrix and the dressing factor. The γ-dependence in the limit is only due to different level-matching conditions. We consider the reduction of the deformed model to R x S^3 and determine the leading γ-dependence of the dispersion relation for a finite J giant magnon.
description: 21 pages; v2: minor corrections (missing 2\pi factor inserted, inequalities corrected); 2 references added
Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field-line Braiding Model with Compound Injections
Creators: name: Guo, Fan
name: Zhao, Lulu
name: Cohen, Christina M. S.
name: Giacalone, Joe
name: Leske, R. A.
name: Wiedenbeck, M. E.
name: Kahler, S. W.
name: Li, Xiaocan
name: Zhang, Qile
name: Ho, George C.
name: Desai, Mihir I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We propose a model for interpreting highly variable ion composition ratios in solar energetic particles (SEP) events recently observed by Parker Solar Probe (PSP) at $0.3 - 0.45$ astronomical unit. We use numerical simulations to calculate SEP propagation in a turbulent interplanetary magnetic field with a Kolmogorov power spectrum from large scale down to the gyration scale of energetic particles. We show that when the source regions of different species are offset by a distance comparable to the size of the source regions, the observed energetic particle composition He/H can be strongly variable over more than two orders of magnitude, even if the source ratio is at the nominal value. Assuming a $^3$He/$^4$He source ratio of $10 \%$ in impulsive $^3$He-rich events and the same spatial offset of the source regions, the $^3$He/$^4$He ratio at observation sites also vary considerably. The variability of the ion composition ratios depends on the radial distance, which can be tested by observations made at different radial locations. We discuss the implication of these results on the variability of ion composition of impulsive events and on further PSP and Solar Orbiter observations close to the Sun.
description: 10 pages, 5 figures, ApJ accepted
Cooperative emission of light by an ensemble of dipoles near a metal nanostucture: The plasmonic Dicke effect
Creators: name: Pustovit, Vitaliy N.
name: Shahbazyan, Tigran V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We identify a new mechanism for cooperative emission of light by an ensemble of N dipoles near a metal nanostructure supporting a surface plasmon.The cross-talk between emitters due to virtual plasmon exchange leads to a formation of three plasmonic super-radiant modes whose radiative decay rates scales with N, while the total radiated energy is thrice that of a single emitter. Our numerical simulations indicate that the plasmonic Dicke effect survives non-radiative losses in the metal.
description: 4 pages, 4 figures
Flavor Anomalies in Heavy Quark Decays
Creators: name: Albrecht, Johannes
name: van Dyk, Danny
name: Langenbruch, Christoph
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent measurements of $b$-hadron decays show a pattern of consistent tensions with the respective Standard Model (SM) predictions. These tensions appear both in the sector of rare flavour-changing neutral currents and in tree-level semileptonic $b$-hadron decays. Flavour-changing neutral-current decays are loop-suppressed in the SM and are thus very susceptible to contributions from new heavy particles and/or new interactions beyond the SM. In rare semileptonic decays tensions are observed in measurements of branching fractions and angular observables, as well as in lepton flavour universality tests. Lepton flavour universality is also tested by comparing tree-level $b\to c\ell^-\barν_τ$ processes involving third generation leptons $\ell=τ$ to semileptonic decays with light leptons $\ell=e,μ$ in the final state. These tests also show tensions between measurements and the SM prediction. Taken together, these tensions constitute the so-called flavour anomalies in $b$-hadron decays, and could be first signs of New Physics (NP) beyond the SM, if established beyond any reasonable doubt. This article reviews both the current experimental status of the flavour anomalies and developments for the relevant theoretical predictions. The review concludes with a discussion of future prospects for the field.
description: 58 pages, 21 figures. Invited review for "Progress in Particle and Nuclear Physics". v1: matches accepted manuscript
The Study of Highway Cross-Section Design Criteria from Traffic Volume Perspective using Traffic Micro-Simulation
Creators: name: Tanwanichkul, Ladda
name: Jumrus Pitaksringkarn
name: Piyawat Thongkrew
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2012
Subjects: Traffic Micro Simulation, Highway Cross

description: 3, 39, KKU Engineering Journal
Performance study of a steam ejector in Vacuum drying application
Creators: name: Worachate Sangsida
name: Thanarath Sriveerakul
name: Chayarnon Saengmanee
name: Kulachate Pianthong
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2012
Subjects: Ejector, Steam, Vacuum drying

description: 3, 39, KKU Engineering Journal