cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evidence for multiple nucleosynthetic processes from carbon enhanced metal-poor stars in the Carina dwarf spheroidal galaxy
Creators: name: Hansen, T. T.
name: Simon, J. D.
name: Li, T. S.
name: Frebel, A.
name: Thompson, I.
name: Shectman, S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context: Carbon Enhanced Metal-Poor (CEMP) stars ($\mathrm{[C/Fe]} > 0.7$) are known to exist in large numbers at low metallicity in the Milky Way halo and are important tracers of early Galactic chemical evolution. However, very few such stars have been identified in the classical dwarf spheroidal (dSph) galaxies, and detailed abundances, including neutron-capture element abundances, have only been reported for 12 stars. Aims: We aim to derive detailed abundances of six CEMP stars identified in the Carina dSph and compare the abundances to CEMP stars in other dSph galaxies and the Milky Way halo. This is the largest sample of CEMP stars in a dSph galaxy analysed to date. Methods: 1D LTE elemental abundances are derived via equivalent width and spectral synthesis using high-resolution spectra of the six stars obtained with the MIKE spectrograph at Las Campanas Observatory. Results: Abundances or upper limits are derived for up to 27 elements from C to Os in the six stars. The analysis reveals one of the stars to be a CEMP-no star with very low neutron-capture element abundances. In contrast, the other five stars all show enhancements in neutron-capture elements in addition to their carbon enhancement, classifying them as CEMP-$s$ and -$r/s$ stars. The six stars have similar $α$ and iron-peak element abundances as other stars in Carina, except for the CEMP-no star, which shows enhancement in Na, Mg, and Si. We explore the absolute carbon abundances ($A(\rm C)$) of CEMP stars in dSph galaxies and find similar behaviour as is seen for Milky Way halo CEMP stars, but highlight that CEMP-$r/s$ stars primarily have very high $A(\rm C)$ values. We also compare the neutron-capture element abundances of the CEMP-$r/s$ stars in our sample to recent $i$-process yields, which provide a good match to the derived abundances.
description: 14 pages, 5 figures, 9 tables, Accepted for publication in A&A
The Occupational alcholism field: a case study of a coalition in an interorganizational field
Creators: name: Zubot, Beverly
Publisher: name: University of Calgary
Year: 1979
Subjects: subject: HV 5283 C26 Z82 1979 Microfiche
subject: Occupational alcoholism field - British Columbia
subject: Alcoholism counseling - British Columbia

description: Bibliography: p. 150-155.
Many-body current formula and current conservation for non-equilibrium fully interacting nanojunctions
Creators: name: Ness, H.
name: Dash, L. K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider the electron transport properties through fully interacting nanoscale junctions beyond the linear-response regime. We calculate the current flowing through an interacting region connected to two interacting leads, with interaction crossing at the left and right contacts, by using a non-equilibrium Green's functions (NEGF) technique. The total current at one interface (the left one for example) is made of several terms which can be regrouped into two sets. The first set corresponds to a very generalised Landauer-like current formula with physical quantities defined only in the interacting central region and with renormalised lead self-energies. The second set characterises inelastic scattering events occurring in the left lead. We show how this term can be negligible or even vanish due to the pseudo-equilibrium statistical properties of the lead in the thermodynamic limit. The expressions for the different Green's functions needed for practical calculations of the current are also provided. We determine the constraints imposed by the physical condition of current conservation. The corresponding equation imposed on the different self-energy quantities arising from the current conservation is derived. We discuss in detail its physical interpretation and its relation with previously derived expressions. Finally several important key features are discussed in relation to the implementation of our formalism for calculations of quantum transport in realistic systems.
Bimodal black-hole mass distribution and chirp masses of binary black-hole mergers
Creators: name: Schneider, Fabian R. N.
name: Podsiadlowski, Philipp
name: Laplace, Eva
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In binary black-hole mergers from isolated binary-star evolution, both black holes are from progenitor stars that have lost their hydrogen-rich envelopes by binary mass transfer. Envelope stripping is known to affect the pre-supernova core structures of such binary-stripped stars and thereby their final fates and compact remnant masses. In this paper, we show that binary-stripped stars give rise to a bimodal black-hole mass spectrum with characteristic black-hole masses of about $9\,\mathrm{M}_\odot$ and $16\,\mathrm{M}_\odot$ across a large range of metallicities. The bimodality is linked to carbon and neon burning becoming neutrino-dominated, which results in interior structures that are difficult to explode and likely lead to black hole formation. The characteristic black-hole masses from binary-stripped stars have corresponding features in the chirp-mass distribution of binary black-hole mergers: peaks at about $8$ and $14\,\mathrm{M}_\odot$, and a dearth in between these masses. Current gravitational-wave observations of binary black-hole mergers show evidence for a gap at $10\text{--}12\,\mathrm{M}_\odot$ and peaks at $8$ and $14\,\mathrm{M}_\odot$ in the chirp-mass distribution. These features are in agreement with our models of binary-stripped stars. In the future, they may be used to constrain the physics of late stellar evolution and supernova explosions, and may even help measure the cosmological expansion of the Universe.
description: 20 pages (including appendix with tabulated data; main text: 8 pages), 6 figures; accepted for publication in ApJ Letters
The Swift BAT Survey Detects Two Optical Broad Line, X-ray Heavily Obscured Active Galaxies: NVSS 193013+341047 and IRAS 05218-1212
Creators: name: Hogg, J. Drew
name: Winter, Lisa M.
name: Mushotzky, Richard
name: Reynolds, Christopher
name: Trippe, Margaret
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Swift Burst Alert Telescope (BAT) is discovering interesting new objects while monitoring the sky in the 14-195 keV band. Here we present the X-ray properties and spectral energy distributions for two unusual AGN sources. Both NVSS 193013+341047 and IRAS 05218-1212 are absorbed, Compton-thin, but heavily obscured (NH \sim 10^23 cm-2), X-ray sources at redshifts < 0.1. The spectral energy distributions reveal these galaxies to be very red, with high extinction in the optical and UV. A similar SED is seen for the extremely red objects (EROs) detected in the higher redshift universe. This suggests that these unusual BAT-detected sources are a low- redshift (z << 1) analog to EROs, which recent evidence suggests are a class of the elusive type II quasars. Studying the multi-wavelength properties of these sources may reveal the properties of their high redshift counterparts.
description: 20 pages, accepted to ApJ
Mapping Research Topics on Earning Per Share (EPS) in Sharia and Conventional Banking: VOSviewer Bibliometric Study and Literature Review
Creators: name: Budianto, Eka Wahyu Hestya
name: Dewi, Nindi Dwi Tetria
Publisher: name: Zenodo
Year: 2023

description: This study aims to determine the research mapping regarding the Earnings Per Share (EPS) ratio in Islamic and Conventional Banking using a mix-method approach, namely the VOSviewer bibliometric study and literature review. Data analysis techniques include: (1) mapping the distribution of journal publications around the EPS ratio; (2) mapping the results of the VOSviewer bibliometric visualization around the EPS ratio based on the number of clusters and their items; and (3) mapping research topics around the EPS ratio using a literature review study. The results showed that: (1) based on the distribution of journal publications, there were 103 journal publications regarding the EPS ratio; (2) based on the mapping of the VOSviewer bibliometric study, the network visualization results around the EPS ratio are divided into 6 clusters and 168 topic items; (3) based on the mapping of literature review studies, there are 11 topics around the influence of the EPS ratio and 18 topics about the determinants of the EPS ratio. The implications and contributions of this research are to map research topics around EPS ratios in Islamic and Conventional Banking which are often or rarely researched by researchers so that they can be a reference for subsequent researchers.
Three-dimensional orbit of AC Her determined: Binary-induced truncation cannot explain the large cavity in this post-AGB transition disk
Creators: name: Anugu, Narsireddy
name: Kluska, Jacques
name: Gardner, Tyler
name: Monnier, John D.
name: Van Winckel, Hans
name: Schaefer, Gail H.
name: Kraus, Stefan
name: Bouquin, Jean-Baptiste Le
name: Ertel, Steve
name: Mérand, Antoine
name: Klement, Robert
name: Davies, Claire L
name: Ennis, Jacob
name: Labdon, Aaron
name: Lanthermann, Cyprien
name: Setterholm, Benjamin R.
name: Brummelaar, Theo ten
name: Corporaal, Akke
name: Sabin, Laurence
name: Rajagopal, Jayadev
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Some evolved binaries, namely post-asymptotic giant branch binaries, are surrounded by stable and massive circumbinary disks similar to protoplanetary disks found around young stars. Around 10% of these disks are transition disks: they have a large inner cavity in the dust. Previous interferometric measurements and modeling have ruled out the cavity being formed by dust sublimation and suggested that the cavity is due to a massive circumbinary planet that traps the dust in the disk and produces the observed depletion of refractory elements on the surface of the post-AGB star. In this study, we test alternative scenario in which the large cavity could be due to dynamical truncation from the inner binary. We performed near-infrared interferometric observations with the CHARA Array on the archetype of such a transition disk around a post-AGB binary: AC Her. We detect the companion at ten epochs over 4 years and determine the 3-dimensional orbit using these astrometric measurements in combination with the radial velocity time series. This is the first astrometric orbit constructed for a post-AGB binary system. We derive the best-fit orbit with a semi-major axis $2.01 \pm 0.01$ mas ($2.83\pm0.08$ au), inclination $(142.9 \pm 1.1)^\circ$ and longitude of the ascending node $(155.1 \pm 1.8)^\circ$. We find that the theoretical dynamical truncation and dust sublimation radius are at least $\sim3\times$ smaller than the observed inner disk radius ($\sim21.5$ mas or 30 au). This strengthens the hypothesis that the origin of such a cavity is due to the presence of a circumbinary planet.
description: Accepted to be published in The Astrophysical Journal
Oblique solitons in the flow of polariton condensate past an obstacle
Creators: name: Kamchatnov, A. M.
name: Korneev, S. V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Formation of oblique solitons by a flow of polariton condensate past an obstacle is considered. The flow is non-uniform due to a finite life-time of polaritons what changes drastically the conditions of formation of oblique solitons compared with the atomic condensate case. The theory shows that the polariton solitons can be generated by a subsonic flow in agreement with the recent experiment [A. Amo {\it et al.}, Science, {\bf 332,} 1167 (2011)]. Geometric form of oblique solitons and other their parameters are calculated analytically and analytical results are confirmed by numerical simulations.
description: 5 pages, 3 figures
Azimuth: A Shiny App for Mapping Single Cell Datasets
Creators: name: Hoffman, Paul
Publisher: name: Zenodo
Year: 2020
Subjects: single-cell
shiny

description: Azimuth introduction and demonstration at CZI EOSS meeting December 8th - 10th, 2020. Azimuth is a Shiny app for mapping single-cell datasets, and is faster and easier to get started with than the traditional single-cell workflow of unsupervised clustering and manual annotation. In addition, a session of Azimuth is provided as as a service where users can upload a single-cell RNA-seq dataset to a website and map to a reference dataset of PBMCs.
Coherent versus Incoherent Light Scattering from a Quantum Dot
Creators: name: Konthasinghe, K.
name: Walker, J.
name: Peiris, M.
name: Shih, C. K.
name: Yu, Y.
name: Li, M. F.
name: He, J. F.
name: Wang, L. J.
name: Ni, H. Q.
name: Niu, Z. C.
name: Muller, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the light scattered by a single InAs quantum dot interacting with a resonant continuous-wave laser. High resolution spectra reveal clear distinctions between coherent and incoherent scattering, with the laser intensity spanning over four orders of magnitude. We find that the fraction of coherently scattered photons can approach unity under sufficiently weak or detuned excitation, ruling out pure dephasing as a relevant decoherence mechanism. We show how spectral diffusion shapes spectra, correlation functions, and phase-coherence, concealing the ideal radiatively-broadened two-level system described by Mollow.
description: to appear in PRB 85, 235315
title: Scanning for IoT Devices Using a Mobile Android Application
Creators: name: Stöger, Michael Bernd
Publisher: name: TU Wien
Year: 2023
Subjects: subject: IoT
subject: Network Scanning
subject: Network Security
subject: Android
subject: Bluetooth
subject: WiFi

description: The number of IoT devices has been growing in the last few years. Many devices that usually had no connectivity whatsoever, are now internet connected. With this high number of devices, it is possible to lose track of which devices are connected to a network. In this work, approaches used to locate and classify devices in the local environment using an unmodified Android device are evaluated. The developed procedures remove entry barriers like expensive equipment or complicated setups for scanning, as only an installed Android application is needed. To increase the number of recognized devices, methods to create device fingerprints from offline Linux firmware images have been researched and implemented. This allows devices to be recognized, which have never been in our hands while developing this application. But not only devices connected to an IP-based network are of concern for this work, but also Bluetooth devices can be recognized by the application. Using this feature allows the user to get an overview of surrounding portable devices, including modern speakers and smartwatches. One major finding of this work is that most active scanning methods found in the literature can be used on Android as well. Passive methods are often unsupported or restricted on this mobile platform. This does not have to negatively affect the results, as detailed information often has to be probed actively anyway.
Staging resistance on the Internet : an insight to the work of Electronic Disturbance Theater
Creators: name: Montes De Oca Tello, Diana
Publisher: name: University of British Columbia
Year: 2009

description: The present Master’s Thesis is motivated by a desire to contribute to the understanding of the work of Electronic Disturbance Theatre (EDT). EDT is a group of four American artists, activists and software designers who work collaboratively in the preparation and staging of online mass demonstrations or “gestures” against diverse targets, for socio-cultural and political reasons. Departing from the recognition that their work is a hybrid form that proposes a blend of cultural performance and activism online, and that it is mostly the second aspect that has been previously discussed in academic studies, the subject is tackled in this document predominantly from a theatrical perspective. Drawing on contemporary performance theories as well as on the concepts of theatricality and social drama I suggest that EDT’s work is an innovative kind of online cultural performance (social dramas staged online) with overtly political and social goals where the proposed actions in fact intervene in real life issues. Throughout the study I also: 1) trace the changes in the conceptualization of theater that avant-garde artists encouraged during the twentieth century in order to highlight how EDT’s project departs from and continues with a history of experimentation, transgression, and innovation; and 2) examine EDT’s origins and conceptual proposal paying particular attention to the way EDT appropriates the Internet to stage cultural resistance, and to the way traditional theatre structures and elements are both used and reconfigured by this resistance practice. Finally, I propose online theatrivism as a defining term for EDT’s work in an effort to highlight the three fundamental aspects it combines: performance, activism and digital technologies. Online theatrivism allows us to recognize the theatrical elements that help organize and enhance the online mass demonstrations. In addition, it reminds us that EDT’s gestures are staged reality that recognizes itself as such, and thus entails a meta-commentary on activist behavior.
Andreas Gryphius' Catharina von Georgien: a study of the modern German tragedy
Creators: name: Gref, Beverly S.
Publisher: name: University of Calgary
Year: 1971
Subjects: subject: PT 1734 C36 G72 1971 Microfilm
subject: Gryphius, Andreas, 1616-1664. Catharina von Georgien
subject: Lessing, Gotthold Ephraim, 1729-1781. Emilia Galotti

description: Bibliography: p. 95-97.
Pairing and alpha-like quartet condensation in N=Z nuclei
Creators: name: Sandulescu, N.
name: Dukelsky, J.
name: Negrea, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss the treatment of isovector pairing by an alpha-like quartet condensate which conserves exactly the particle number, the spin and the isospin. The results show that the quartet condensate describes accurately the isovector pairing correlations in the ground state of systems with an equal number of protons and neutrons
description: 4 pages, to appear in Journal of Physics: Conference Series
Reliability and validity of the Wheelchair Outcome Measure
Creators: name: Garden, Jennifer Anna
Publisher: name: University of British Columbia
Year: 2009

description: Study Design: Prospective test re-test study. Objectives: To examine the reliability and validity of the Wheelchair Outcome Measure (WhOM) and discuss its clinical implications. Background: Review of the literature indicates the need for a client-centred wheelchair outcome measurement tool that measures participation outcomes related to wheelchair use. To date there have been no studies of the reliability and/or validity of the WhOM. Methods and Measures: A total of 50 participants who had a spinal cord injury participated in the study. There were three time periods in which the participant was required to answer questions. During the first session, demographic information was collected and the WhOM was completed along with the four additional measures. During the second session, the WhOM satisfaction scores were measured again. The entire WhOM was re-administered during the third by a second rater. A relative reliability index (intra-class correlation coefficient, ICC2,1 for test re-test and ICC2.2 for inter-rater reliability) was employed. Rater agreement for identified WhOM participation outcomes was determined using Kappa coefficients. Spearman’s correlation coefficient was used to examine construct validity. Results: Test re-test agreements were high (ICC2,1: 0.90) and inter-rater agreements were high (ICC2,2: 0.90). Substantial agreement between raters for identified participation outcomes was achieved (K≥ 0.71). The subscale of assistive device scale of the Quebec User Evaluation of Satisfaction with Assistive Technology (QUEST) demonstrated a positive relationship with the WhOM (r ≥ 0.65). Items on the Assessment of Life Habits (LIFE-H) demonstrated a positive relationship with the WhOM (r ranged from 0.51 – 0.62). Both the Psychosocial Impact of Assistive Devices Scale and the Return to Normal Living Index failed to meet the hypothesis (r ≥ 0.50). Conclusion: The WhOM is a new and useful tool for clinicians and researchers who work in the field of wheelchair prescription and research. Test re-test and inter-rater agreements were high for individuals with a diagnosis of a spinal cord injury. Evidence of validity was demonstrated with the QUEST and items from the LIFE-H.
A Study of the development of the Early New High German literary language
Creators: name: Wright, Diana S.
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: PF 4043 W73 1972
subject: German language - Middle High German - History
subject: German literature - Middle High German, 1050-1500 - History and criticism

description: Bibliography: p. 112-114.
description: An examination of the development of the Early New High German literary language reveals that such development was significantly affected by the influence of areas lacking a previous written tradition in German. In order to form the German literary language, the unification of the various forms of dialectal language into one standard form which would be acceptable in all German-speaking regions was necessary. An examination of the language as it was used in the official correspondence of four influential German monarchs reveals that early progress towards the goal of unification took place in the chanceries. Here written German was used extensively, and the reciprocal influence of chanceries caused a levelling process whereby the language became standardized to a degree. The trend towards language unification was particularly evident in the chancery of the Saxon Electorate in Wittenberg, where the language used represented a combination of Middle German and Upper German features. An investigation of the relationship of both dialect and chancery languages to the origin and development of the literary language reveals that neither localized language forms nor official chancery languages may be singled out and designated as the source of the literary language. During the fourteenth century many localized but supradialectal languages developed. Such languages, which were called literary dialects, became increasingly similar through reciprocal influence, and so showed tendencies towards a unified literary language. Latin influence on the development of the German language occurred initially as a result of the expansion of the Roman Empire. Both during and following this period Latin was the dominant language of Europe o As the German language was beginning to emerge from this period of Latin domination, it was again subjected to the influence of the languages and literature of antiquity through the advent of the humanistic era. Although insistence on the use of Latin in academic, official and literary circles retarded the development of the German literary language, the effects of Latin influence on the clarity and regularity of German were advantageous to such developmenL Luther's effect upon language development was catalystic. The language which he used in his translation of the Bible was based on that used by the chancery of the Saxon Electorate. By modelling his language on one particular linguistic standard, Luther was able to exert a unifying influence upon the German language. His popularity and the wide adoption of his translation of the Bible enabled him to accelerate language development towards uniformity.
Effect of Earth-Moon's gravity on TianQin's range acceleration noise. III. An analytical model
Creators: name: Jiao, Lei
name: Zhang, Xuefeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: TianQin is a proposed space-based gravitational wave detector designed to operate in circular high Earth orbits. As a sequel to [Zhang et al. Phys. Rev. D 103, 062001 (2021)], this work provides an analytical model to account for the perturbing effect of the Earth's gravity field on the range acceleration noise between two TianQin satellites. For such an ``orbital noise,'' the Earth's contribution dominates above $5\times 10^{-5}$ Hz in the frequency spectrum, and the noise calibration and mitigation, if needed, can benefit from in-depth noise modeling. Our model derivation is based on Kaula's theory of satellite gravimetry with Fourier-style decomposition, and uses circular reference orbits as an approximation. To validate the model, we compare the analytical and numerical results in two main scenarios. First, in the case of the Earth's static gravity field, both noise spectra are shown to agree well with each other at various orbital inclinations and radii, confirming our previous numerical work while providing more insight. Second, the model is extended to incorporate the Earth's time-variable gravity. Particularly relevant to TianQin, we augment the formulas to capture the disturbance from the Earth's free oscillations triggered by earthquakes, of which the mode frequencies enter TianQin's measurement band above 0.1 mHz. The analytical model may find applications in gravity environment monitoring and noise-reduction pipelines for TianQin.
description: 16 pages, 9 figures, accepted by Phys. Rev. D
On Lagrangian fibrations by Jacobians II
Creators: name: Sawon, Justin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J28, 14D06, 53C26

description: Let Y->P^n be a flat family of reduced Gorenstein curves, such that the compactified relative Jacobian X=\bar{J}^d(Y/P^n) is a Lagrangian fibration. We prove that X is a Beauville-Mukai integrable system if n=3, 4, or 5, and the curves are irreducible and non-hyperelliptic. We also prove that X is a Beauville-Mukai system if n=3, d is odd, and the curves are canonically positive 2-connected hyperelliptic curves.
description: 33 pages
Non-Makovian decoherence of a two-level system weakly coupled to a bosonic bath
Creators: name: Slutskin, A. A.
name: Bratus', K. N.
name: Bergvall, A.
name: Shumeiko, V. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Bloch-Redfield equation is a common tool for studying evolution of qubit systems weakly coupled to environment. We investigate the accuracy of the Born approximation underlying this equation. We find that the high order terms in the perturbative expansion contain accumulating divergences that make straightforward Born approximation inappropriate. We develop diagrammatic technique to formulate, and solve the improved self-consistent Born approximation. This more accurate treatment reveals an exponential time dependent prefactor in the non-Markovian contribution dominating the qubit long-time relaxation found in Phys. Rev. B 71, 035318 (2005). At the same time, the associated dephasing is not affected and is described by the Born-Markov approximation.
description: To appear in EuroPhys. Lett
Probing scattering phase shifts by attosecond streaking
Creators: name: Pazourek, Renate
name: Nagele, Stefan
name: Doblhoff-Dier, Katharina
name: Feist, Johannes
name: Lemell, Christoph
name: Tökési, Karoly
name: Burgdörfer, Joachim
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Attosecond streaking is one of the most fundamental processes in attosecond science allowing for a mapping of temporal (i.e. phase) information on the energy domain. We show that on the single-particle level attosecond streaking time shifts contain spectral phase information associated with the Eisenbud-Wigner-Smith (EWS) time delay, provided the influence of the streaking infrared field is properly accounted for. While the streaking phase shifts for short-ranged potentials agree with the associated EWS delays, Coulomb potentials require special care. We show that the interaction between the outgoing electron and the combined Coulomb and IR laser fields lead to a streaking phase shift that can be described classically.
Variability of Young Stellar Objects in the Perseus Molecular Cloud
Creators: name: Wang, Xiao-Long
name: Fang, Min
name: Herczeg, Gregory J.
name: Gao, Yu
name: Tian, Hai-Jun
name: Zhou, Xing-Yu
name: Zhang, Hong-Xin
name: Chen, Xue-Peng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of 288 young stellar objects (YSOs) in the Perseus Molecular Cloud that have well defined $g$ and $r$-band lightcurves from the Zwicky Transient Facility. Of the 288 YSOs, 238 sources (83% of our working sample) are identified as variables based on the normalized peak-to-peak variability metric, with variability fraction of 92% for stars with disks and 77% for the diskless populations. These variables are classified into different categories using the quasiperiodicity ($Q$) and flux asymmetry ($M$) metrics. Fifty-three variables are classified as strictly periodic objects that are well phased and can be attributed to spot modulated stellar rotation. We also identify 22 bursters and 25 dippers, which can be attributed to accretion burst and variable extinction, respectively. YSOs with disks tend to have asymmetric and non-repeatable lightcurves, while the YSOs without disks tend to have (quasi)periodic lightcurves. The periodic variables have the steepest change in $g$ versus $g-r$, while bursters have much flatter changes than dippers in $g$ versus $g-r$. Periodic and quasiperiodic variables display the lowest variability amplitude. Simple models suggest that the variability amplitudes of periodic variables correspond to changes of the spot coverage of 30% to 40%, burster variables are attributed to accretion luminosity changes in the range of $L_{\rm acc}/L_{\star}=0.1-0.3$, and dippers are due to variable extinction with $A_{V}$ changes in the range of $0.5-1.3\;$mag.
description: 26 pages, 16 figures, 3 tables, accepted for publication in RAA
Subdiffusive master equation with space dependent anomalous exponent: `Black Swan' effects
Creators: name: Fedotov, Sergei
name: Falconer, Steven
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive the fractional master equation with space dependent anomalous exponent. We analyze the asymptotic behavior of corresponding lattice model both analytically and by Monte Carlo simulation. We show that the subdiffusive fractional equations with constant anomalous exponent $μ$ in a bounded domain $[ 0,L]$ are not structurally stable with respect to the non-homogeneous variations of parameter $μ$. In particular, the Gibbs-Boltzmann distribution is no longer the stationary solution of the fractional Fokker-Planck equation whatever the space variation of the exponent might be. We analyze the random distribution of $% μ$ in space and find that in the long time limit, the probability distribution is highly intermediate in space and the behavior is completely dominated by very unlikely events.
description: 6 pages
Development of a natural science education game for the learning of basic concepts concerning space exploration
Creators: name: Ganske, Ludwig
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: LB 1029.8 G3 G34 1972 Microfilm
subject: Educational games
subject: Science - Study and teaching
subject: Outer space - Exploration - Study and teaching

description: Bibliography: p. 90-99.
Submillimeter Observations of Millimeter Bright Galaxies Discovered by the South Pole Telescope
Creators: name: Greve, T. R.
name: Vieira, J. D.
name: Weiss, A.
name: Aguirre, J. E.
name: Aird, K. A.
name: Ashby, M. L. N.
name: Benson, B. A.
name: Bleem, L. E.
name: Bradford, C. M.
name: Brodwin, M.
name: Carlstrom, J. E.
name: Chang, C. L.
name: Chapman, S. C.
name: Crawford, T. M.
name: de Breuck, C.
name: de Haan, T.
name: Dobbs, M. A.
name: Downes, T.
name: Fassnacht, C. D.
name: Fazio, G.
name: George, E. M.
name: Gladders, M.
name: Gonzalez, A. H.
name: Halverson, N. W.
name: Hezaveh, Y.
name: High, F. W.
name: Holder, G. P.
name: Holzapfel, W. L.
name: Hoover, S.
name: Hrubes, J. D.
name: Johnson, M.
name: Keisler, R.
name: Knox, L.
name: Lee, A. T.
name: Leitch, E. M.
name: Lueker, M.
name: Luong-Van, D.
name: Malkan, M.
name: Marrone, D. P.
name: McIntyre, V.
name: McMahon, J. J.
name: Mehl, J.
name: Menten, K. M.
name: Meyer, S. S.
name: Montroy, T.
name: Murphy, E. J.
name: Natoli, T.
name: Padin, S.
name: Plagge, T.
name: Pryke, C.
name: Reichardt, C. L.
name: Rest, A.
name: Rosenman, M.
name: Ruel, J.
name: Ruhl, J. E.
name: Schaffer, K. K.
name: Sharon, K.
name: Shaw, L.
name: Shirokoff, E.
name: Stalder, B.
name: Stanford, S. A.
name: Staniszewski, Z.
name: Stark, A. A.
name: Story, K.
name: Vanderlinde, K.
name: Walsh, W.
name: Welikala, N.
name: Williamson, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present APEX SABOCA 350micron and LABOCA 870micron observations of 11 representative examples of the rare, extremely bright (S_1.4mm > 15mJy), dust-dominated millimeter-selected galaxies recently discovered by the South Pole Telescope (SPT). All 11 sources are robustly detected with LABOCA with 40 < S_870micron < 130mJy, approximately an order of magnitude higher than the canonical submillimeter galaxy (SMG) population. Six of the sources are also detected by SABOCA at >3sigma, with the detections or upper limits providing a key constraint on the shape of the spectral energy distribution (SED) near its peak. We model the SEDs of these galaxies using a simple modified blackbody and perform the same analysis on samples of SMGs of known redshift from the literature. These calibration samples inform the distribution of dust temperature for similar SMG populations, and this dust temperature prior allows us to derive photometric redshift estimates and far infrared luminosities for the sources. We find a median redshift of = 3.0, higher than the = 2.2 inferred for the normal SMG population. We also derive the apparent size of the sources from the temperature and apparent luminosity, finding them to appear larger than our unlensed calibration sample, which supports the idea that these sources are gravitationally magnified by massive structures along the line of sight.
description: (15 pages, 6 color figures; accepted for publication in ApJ)
Non-linear resistivity and heat dissipation in monolayer graphene
Creators: name: Price, A. S.
name: Hornett, S. M.
name: Shytov, A. V.
name: Hendry, E.
name: Horsell, D. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have experimentally studied the nonlinear nature of electrical conduction in monolayer graphene devices on silica substrates. This nonlinearity manifests itself as a nonmonotonic dependence of the differential resistance on applied DC voltage bias across the sample. At temperatures below ~70K, the differential resistance exhibits a peak near zero bias that can be attributed to self-heating of the charge carriers. We show that the shape of this peak arises from a combination of different energy dissipation mechanisms of the carriers. The energy dissipation at higher carrier temperatures depends critically on the length of the sample. For samples longer than 10um the heat loss is shown to be determined by optical phonons at the silica-graphene interface.
description: 4 pages, 4 figures
Assessing Climate Mitigation Awareness by Generating Counterfactuals
Creators: name: Lunn, Peter D
name: Timmons, Shane
name: Andersson, Ylva
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Environmental Studies
subject: Life Sciences
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: A detailed preregistration document can be found under project files (Climate Mitigation Awareness - Pre-reg.pdf)
The coherent artifact in modern pulse measurements
Creators: name: Ratner, Justin
name: Steinmeyer, Günter
name: Wong, Tsz Chun
name: Bartels, Randy
name: Trebino, Rick
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We simulate multi-shot intensity-and-phase measurements of unstable ultrashort-pulse trains using frequency-resolved-optical-gating (FROG) and spectral phase interferometry for direct electric-field reconstruction (SPIDER). Both techniques fail to reveal the pulse structure. FROG yields the average pulse duration and suggests the instability by exhibiting disagreement between measured and retrieved traces. SPIDER under-estimates the average pulse duration but retrieves the correct average pulse spectral phase. An analytical calculation confirms this behavior.
description: submission to Opt. Lett
Petrology of the Quaternary volcanic centers in the Quesnel Highlands and Garibaldi Provincial Park areas, British Columbia
Creators: name: Fiesinger, D. W.
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: QE 446 F52 1975 Microfiche
subject: Petrology - British Columbia
subject: Rocks, Igneous
subject: Volcanic ash, tuff, etc.

description: Bibliography: p. 127-132.
Vibrational strong coupling in liquid water from cavity molecular dynamics
Creators: name: Lieberherr, Annina Z.
name: Furniss, Seth T. E.
name: Lawrence, Joseph E.
name: Manolopoulos, David E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We assess the cavity molecular dynamics method for the calculation of vibrational polariton spectra, using liquid water as a specific example. We begin by disputing a recent suggestion that nuclear quantum effects may lead to a broadening of polariton bands, finding instead that they merely result in anharmonic red shifts in the polariton frequencies. We go on to show that our simulated cavity spectra can be reproduced to graphical accuracy with a harmonic model that uses just the cavity-free spectrum and the geometry of the cavity as input. We end by showing that this harmonic model can be combined with the experimental cavity-free spectrum to give results in good agreement with optical cavity measurements. Since the input to our harmonic model is equivalent to the input to the transfer matrix method of applied optics, we conclude that cavity molecular dynamics cannot provide any more insight into the effect of vibrational strong coupling on the absorption spectrum than this transfer matrix method, which is already widely used by experimentalists to corroborate their cavity results.
description: 10 pages, 5 figures
A multiple-beam CLEAN for imaging intra-day variable radio sources
Creators: name: Stewart, I. M.
name: Fenech, D. M.
name: Muxlow, T. W. B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The CLEAN algorithm, widely used in radio interferometry for the deconvolution of radio images, performs well only if the raw radio image (dirty image) is, to good approximation, a simple convolution between the instrumental point-spread function (dirty beam) and the true distribution of emission across the sky. An important case in which this approximation breaks down is during frequency synthesis if the observing bandwidth is wide enough for variations in the spectrum of the sky to become significant. The convolution assumption also breaks down, in any situation but snapshot observations, if sources in the field vary significantly in flux density over the duration of the observation. Such time-variation can even be instrumental in nature, for example due to jitter or rotation of the primary beam pattern on the sky during an observation. An algorithm already exists for dealing with the spectral variation encountered in wide-band frequency synthesis interferometry. This algorithm is an extension of CLEAN in which, at each iteration, a set of N `dirty beams' are fitted and subtracted in parallel, instead of just a single dirty beam as in standard CLEAN. In the wide-band algorithm the beams are obtained by expanding a nominal source spectrum in a Taylor series, each term of the series generating one of the beams. In the present paper this algorithm is extended to images which contain sources which vary over both frequency and time. Different expansion schemes (or bases) on the time and frequency axes are compared, and issues such as Gibbs ringing and non-orthogonality are discussed. It is shown that practical considerations make it often desirable to orthogonalize the set of beams before commencing the cleaning. This is easily accomplished via a Gram-Schmidt technique.
description: 9 pages, 7 figures. Accepted for publication in A&A
Hadronic-Origin TeV gamma-Rays and Ultra-High Energy Cosmic Rays from Centaurus A
Creators: name: Sahu, Sarira
name: Zhang, Bing
name: Fraija, Nissim
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Centaurus A (Cen A) is the nearest radio-loud AGN and is detected from radio to very high energy gamma-rays. Its nuclear spectral energy distribution (SED) shows a double-peak feature, which is well explained by the leptonic synchrotron + synchrotron self-Compton model. This model however cannot account for the observed high energy photons in the TeV range, which display a distinct component. Here we show that ~ TeV photons can be well interpreted as the neutral pion decay products from p-gamma interactions of Fermi accelerated high energy protons in the jet with the seed photons around the second SED peak at ~170 keV. Extrapolating the inferred proton spectrum to high energies, we find that this same model is consistent with the detection of 2 ultra-high-energy cosmic ray events detected by Pierre Auger Observatory from the direction of Cen A. We also estimate the GeV neutrino flux from the same process, and find that it is too faint to be detected by current high-energy neutrino detectors.
description: Phys. Rev. D in press, This article supersedes arXiv:1007.0455
Magnetic properties of Nd6Fe13Cu single crystals
Creators: name: Liu, Jianing
name: Xie, Ruiwen
name: Aubert, Alex
name: Schäfer, Lukas
name: Zhang, Hongbin
name: Gutfleisch, Oliver
name: Skokov, Konstantin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The understanding of coercivity mechanism in high performance Nd-Fe-B permanent magnets relies on the analysis of the magnetic properties of all phases present in the magnets. By adding Cu in such compounds, a new Nd6Fe13Cu grain boundary phase is formed, however, the magnetic properties of this phase and its role in the magnetic decoupling of the matrix Nd2Fe14B grains are still insufficiently studied. In this work, we have grown Nd6Fe13Cu single crystals by the reactive flux method and studied their magnetic properties in detail. It is observed that below the Néel temperature (TN = 410 K), the Nd6Fe13Cu is antiferromagnetic in zero magnetic field; whereas when a magnetic field is applied along the a-axis, a spin-flop transition occurs at approx. 6 T, indicating a strong competition between antiferromagnetic and ferromagnetic interactions in two Nd layers below and above the Cu layers. Our atomistic spin dynamics simulation confirms that an increase in temperature and/or magnetic field can significantly change the antiferromagnetic coupling between the two Nd layers below and above the Cu layers, which, in turn, is the reason for the observed spin-flop transition. These results suggest that the role of antiferromagnetic Nd6Fe13Cu grain boundary phase in the coercivity enhancement of Nd-Fe-B-Cu magnets is more complex than previously thought, mainly due to the competition between its antiferro- and ferro-magnetic exchange interactions.
description: 15 pages, 4 figures
The White River ash, Yukon Territory: a petrologic study
Creators: name: Downes, Hilary
Publisher: name: University of Calgary
Year: 1979
Subjects: subject: QE 461 D68 1979 Fiche
subject: Volcanic ash, tuff, etc. - Yukon Territory
subject: Petrology - Yukon Territory
subject: Rocks, Igneous

description: Bibliography; p. 131-134.
Intergenerational Preferences and Continuity: Reconciling Order and Topology
Creators: name: Estevan, Asier
name: Maura, Roberto
name: Valero, Oscar
Publisher: name: arXiv
Year: 2024
Subjects: subject: Theoretical Economics (econ.TH)
subject: Computer Science and Game Theory (cs.GT)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: In this paper we focus our efforts on studying how a preorder and topology can be made compatible. Thus we provide a characterization of those that are continuous-compatible. Such a characterization states that such topologies must be finer than the so-called upper topology induced by the preorder and, thus, it clarifies which topology is the smallest one among those that make the preorder continuous. Moreover, we provide sufficient conditions that allows us to discard in an easy way the continuity of a preference. In the light of the obtained results, we provide possibility counterparts of the a few celebrate impossibility theorems for continuous social social intergenerational preferences due to P. Diamond, L.G. Svensson and T. Sakai. Furthermore, we suggest quasi-pseudo-metrics as appropriate quantitative tool for reconciling topology and social intergenerational preferences. Thus, we develop a metric type method which is able to guarantee possibility counterparts of the aforesaid impossibility theorems and, in addition, it is able to give numerical quantifications of the improvement of welfare. We also show that our method makes always the intergenerational preferences semi-continuous multi-utility representables in the sense of Özgü Evern and Efe O. Ok. Finally, in order to keep close to the classical way of measuring in the literature, a refinement of the previous method is presented in such a way that metrics are involved.