cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Advancement of Micro Gas Chromatographs and Their Core Components
Creators: name: Li, Maxwell
Publisher: name: My University
Year: 2021
Subjects: subject: Micro Gas Chromatography
subject: Portable Vapor Sensors
subject: Chemical Analysis
subject: Plasma Chemical Sensors
subject: Chemical Separation
subject: Biomedical Engineering
subject: FOS: Medical engineering
subject: Electrical Engineering
subject: Engineering

description: The development of portable vapor sensors is of high interest for in situ and real-time chemical analysis. These sensors are targeted at industrial and environmental monitoring as well as point-of-care applications. Advances in microelectromechanical systems (MEMS) technologies has allowed for the miniaturization of benchtop gas chromatography (GC) into portable micro GC (µGC) systems that allow for field analysis. This dissertation details the development of critical µGC components, especially microcolumns and micro photoionization detectors (PIDs), along with their assembly into prototype µGC systems for in situ testing. Two different microcolumn coatings were developed to broaden the range of chemical separations suitable for µGC analysis, including a micro porous layer open tubular column for light compound analysis and micro ionic liquid column for simultaneous analysis of polar and nonpolar compounds. A new column coating method was also demonstrated to improve separation performance without the need for increasing column length or any auxiliary components. A micro helium desorption PID (µHDPID) fabrication process was developed to allow for the robust fabrication of universal vapor detectors, complementing the increased range of separations from the new microcolumn coatings. A high sensitivity PID system was also developed with sub-pg detection limits, comparable to or even surpassing that of benchtop flame ionization detectors. These components were assembled into two prototype systems, one for hydrogen and methane detection for breath analysis, and another ultracompact µGC system with the entire system capable of being contained within a 1.1 L box, including batteries, pumps, and electronic readout boards. Together, these developments are aimed at increasing the range of applications that can be targeted by µGC by broadening its separation and detection capabilities, as well as improving the sensing performance.
Making The Best Of Great Things: Gpi & Alma Imaging Of The Nearest Known Protoplanetary Disks
Creators: name: Kastner, Joel
Publisher: name: Zenodo
Year: 2016

description: I present results from Gemini Planet Imager and ALMA imaging of the protoplanetary disks orbiting TW Hya (D = 54 pc) and V4046 Sgr (D = 73 pc). Thanks to their proximity, imaging of these disks with GPI and ALMA achieves exceptionally high

linear spatial resolution (down to 1-2 AU, in the case of GPI). In both cases, GPI and ALMA imaging reveals intriguing ring/gap structures.
description: Thanks to: Former/present Ph.D. students: V. Rapson, D. Principe, K. Punzi Collaborators: R. Dong, M. Millard-­‐Blanchaer, S. Andrews, D. Hines, B. MacIntosh, M. Tamura, C. Qi, D. Wilner, K. Oberg, U. Gorti, P. Hily-­‐Blant, T.  Forveille, … Sponsors: NASA’s Exoplanets and ADA Programs
Open Access (OA) immersion: librarians report from the field
Creators: name: Vanderjagt, Leah
name: Waller, Andrew
Publisher: name: University of Calgary
Year: 2009
Subjects: subject: Library & Information Science
subject: Open Access
subject: OA
subject: Library and Information Science
subject: Librarians
subject: Open Access mandates
subject: University of Calgary

description: Presented at the CLA/ACB 2009 National Conference & Trade Show, Palais des congrès de Montréal, Montréal, Quebec, May 30, 2009.
description: Librarians encounter OA in their own publishing activities, and by engaging in the broader OA movement via disciplinary initiatives such as EPrints and the University of Calgary Open Access Authors Fund. Can we translate our experiences and initiatives to assist with OA program planning and improve service?
The Nature and Cause of Spectral Variability in LMC X-1
Creators: name: Ruhlen, L.
name: Smith, D. M.
name: Swank, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the results of a long-term observation campaign of the extragalactic wind-accreting black-hole X-ray binary LMC X-1, using the Proportional Counter Array on the Rossi X-Ray Timing Explorer (RXTE). The observations show that LMC X-1's accretion disk exhibits an anomalous temperature-luminosity relation. We use deep archival RXTE observations to show that large movements across the temperature-luminosity space occupied by the system can take place on time scales as short as half an hour. These changes cannot be adequately explained by perturbations that propagate from the outer disk on a viscous timescale. We propose instead that the apparent disk variations reflect rapid fluctuations within the Compton up-scattering coronal material, which occults the inner parts of the disk. The expected relationship between the observed disk luminosity and apparent disk temperature derived from the variable occultation model is quantitatively shown to be in good agreement with the observations. Two other observations support this picture: an inverse correlation between the flux in the power-law spectral component and the fitted inner disk temperature, and a near-constant total photon flux, suggesting that the inner disk is not ejected when a lower temperature is observed.
description: 35 pages, 10 figures, to be published in ApJ
The Empirical Limits of Gyrochronology
Creators: name: Bouma, Luke G.
name: Palumbo, Elsa K.
name: Hillenbrand, Lynne A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The promise of gyrochronology is that given a star's rotation period and mass, its age can be inferred. The reality of gyrochronology is complicated by effects other than ordinary magnetized braking that alter stellar rotation periods. In this work, we present an interpolation-based gyrochronology framework that reproduces the time- and mass-dependent spin-down rates implied by the latest open cluster data, while also matching the rate at which the dispersion in initial stellar rotation periods decreases as stars age. We validate our technique for stars with temperatures of 3800-6200 K and ages of 0.08-2.6 gigayears (Gyr), and use it to reexamine the empirical limits of gyrochronology. In line with previous work, we find that the uncertainty floor varies strongly with both stellar mass and age. For Sun-like stars (5800 K), the statistical age uncertainties improve monotonically from $\pm$38% at 0.2 Gyr to $\pm12$% at 2 Gyr, and are caused by the empirical scatter of the cluster rotation sequences combined with the rate of stellar spin-down. For low-mass K-dwarfs (4200 K), the posteriors are highly asymmetric due to stalled spin-down, and $\pm$1$σ$ age uncertainties vary non-monotonically between 10% and 50% over the first few gigayears. High-mass K-dwarfs (5000 K) older than 1.5 Gyr yield the most precise ages, with limiting uncertainties currently set by possible changes in the spin-down rate (12% systematic), the calibration of the absolute age scale (8% systematic), and the width of the slow sequence (4% statistical). An open-source implementation, called gyro-interp, is available online at https://github.com/lgbouma/gyro-interp
description: ApJL accepted. Data behind Fig1 are uploaded. Code documentation is at https://gyro-interp.readthedocs.io/
Social problem-solving and emotion processes among early adolescent bystanders in hypothetical bullying situations
Creators: name: Rocke Henderson, Natalie Anne
Publisher: name: University of British Columbia
Year: 2010

description: In an effort to understand bystander behavior, the purpose of this study was to examine the role of emotions and peer relationships on early adolescent bystanders’ social problem-solving. Students in grades 6 and 7 (N = 349) read a series of hypothetical bullying vignettes and were asked to imagine that what happens to the victim in each vignette happens to a self-nominated friend or non-friend. Students were then asked about their feelings (i.e., initial emotion, initial emotional display, level of emotion, intention to dissemble), strategies, and goals. Research questions considered links between strategies and goals, whether social problem-solving and emotion processes varied as a function of gender and friendship status with the victim, and links between social problem-solving and emotion processes. Results of canonical correlation showed that bystanders who endorsed strategies likely to perpetuate bullying were less motivated to pursue goals aimed at assisting the victim, giving higher ratings instead to self-focused and anti-social goals. With few exceptions, a series of 2 X 2 (gender [boys, girls] X friendship status [friend versus non-friend]) repeated measures analyses of variance (ANOVA) highlighted that bystanders’ strategies and goals varied as a function of gender and friendship status with the victim. Girls generally favored prosocial strategies and goals more than boys; intervention was more likely on behalf of friends. A series of gender X friendship status repeated measures ANOVAs examining bystanders’ emotion processes showed that friendship status was important. For instance, bystanders indicated that they would experience more anger and would be more willing to show their anger in a hypothetical bullying situation involving a bullied friend. Finally, results of a series of hierarchical multiple regressions showed that the degree to which bystanders thought they would experience different emotions emerged as a strong predictor of individual strategies and goals in hypothetical situations, particularly when the situation involved a non-friend. Findings highlight the importance of emotions, peer relationships, and gender as related to bystander social problem-solving in hypothetical situations with implications for increasing peer intervention.
An Interpolation Procedure for List Decoding Reed--Solomon codes Based on Generalized Key Equations
Creators: name: Zeh, Alexander
name: Gentner, Christian
name: Augot, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The key step of syndrome-based decoding of Reed-Solomon codes up to half the minimum distance is to solve the so-called Key Equation. List decoding algorithms, capable of decoding beyond half the minimum distance, are based on interpolation and factorization of multivariate polynomials. This article provides a link between syndrome-based decoding approaches based on Key Equations and the interpolation-based list decoding algorithms of Guruswami and Sudan for Reed-Solomon codes. The original interpolation conditions of Guruswami and Sudan for Reed-Solomon codes are reformulated in terms of a set of Key Equations. These equations provide a structured homogeneous linear system of equations of Block-Hankel form, that can be solved by an adaption of the Fundamental Iterative Algorithm. For an $(n,k)$ Reed-Solomon code, a multiplicity $s$ and a list size $\listl$, our algorithm has time complexity \ON{\listl s^4n^2}.
description: IEEE Transactions on Information Theory (2011)
Data-Driven Optimization for Individualized Medical Decision-Making in Cancer
Creators: name: Li, Weiyu
Publisher: name: My University
Year: 2021
Subjects: subject: Data-driven optimization
subject: Medical decision-making
subject: Cancer
subject: Partially observable Markov decision process
subject: Hidden Markov Model
subject: Industrial and Operations Engineering
subject: Engineering

description: Cancer is one of the leading causes of death in many countries, including the United States. Medical decision-making in cancer detection and treatment is often a challenging engineering problem for three reasons: the unobservable nature of the cancer state, the trade-off between alternative detection and treatment policies, and the patient heterogeneity in disease progression and clinical effectiveness. In this thesis, we take a holistic approach on data-driven optimization methods for individualized medical decision-making in cancer via three studies, in the context of active surveillance for prostate cancer. In the first study, we develop a hidden Markov model to describe the stochastic process of cancer progression and diagnosis tests dynamics in four major studies. The model is subsequently used as the basis for simulation models to evaluate different published biopsy protocols. In the second study, we propose a finite-horizon partially observable Markov decision process (POMDP) to optimize the timing of biopsies for each individual patient. We develop two fast approximation algorithms to solve the proposed model, and show some important properties of the optimal biopsy policy. This study also considers the impact of parameter ambiguity caused by the variation across different clinical studies and patients' preferences. In the third study, we propose a new multi-model POMDP to address the issue of parameter ambiguity in POMDPs. We analyze the mathematical structure of the model, solution algorithms, and we present numerical results demonstrating the benefits of the Multi-model partially observable Markov decision processes (MPOMDP). Finally, we summarize the most important findings from this dissertation.
Open Access Journals Support in Canada
Creators: name: Morrison, Heather
name: Owen, Brian
name: Taylor, Donald
name: Waller, Andrew
name: Vezina, Kumiko
Publisher: name: University of Calgary
Year: 2010
Subjects: subject: Library & Information Science
subject: Open Access
subject: Scholarly publishing
subject: Open Access economics

description: Presented by Heather Morrison & Brian Owen at annual meeting of the Canadian Association of Learned Journals, Congress Conference, Montreal, PQ, June 1, 2010
description: Describes preliminary results of the pan-Canadian Open Access Journals Support in Canada survey of university libraries and presses conducted in spring 2010. The majority of respondents are involved in scholarly journal publishing, with more planning to get involved. There is strong trend towards preferential support for open access publishing. Responses to questions about support for a variety of open access models indicated that any model for OA transition would received some level of support from a majority of libraries.
Modeling contact binaries, II. The effect of energy transfer
Creators: name: Fabry, Matthias
name: Marchant, Pablo
name: Langer, Norbert
name: Sana, Hugues
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. It is common for massive stars to engage in binary interaction. In close binaries, the components can enter a contact phase, where both stars overflow their respective Roche lobes simultaneously. While there exist observational constraints on the stellar properties of such systems, the most detailed stellar evolution models that feature a contact phase are not fully reconcilable with those measurements. Aims. We aim to consistently model contact phases of binary stars in a 1D stellar evolution code. To this end, we develop the methodology to account for energy transfer in the common contact layers. Methods. We implement an approximative model for energy transfer between the components of a contact binary based on the von Zeipel theorem in the stellar evolution code MESA. We compare structure and evolution models with and without this transfer and analyze the implications for the observable properties of the contact phase. Results. Implementing energy transfer helps eliminating baroclinicity in the common envelope between the components of a contact binary, which, if present, would drive strong thermal flows. We find that accounting for energy transfer in massive contact binaries significantly alters the mass ratio evolution and can extend the lifetime of an unequal mass ratio contact system.
description: 11 pages, 5 figures. Accepted to A&A
Structure of Zariski-closed algebras
Creators: name: Belov-Kanel, Alexei
name: Rowen, Louis H.
name: Vishne, Uzi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16G99

description: The objective of this paper is to describe the structure of Zariski closed algebras, which provide a useful generalization to finite dimensional algebras in the study of representable algebras over finite fields. Our results include a version of Wedderburn's principal theorem, as well as a more explicit description using representations, in terms of "gluing" in Wedderburn components. Finally, we construct "generic" Zariski closed algebras, whose description is considerably more complicated than the description of generic algebra of finite dimensional algebras. Special attention is given to infinite dimensional algebras over finite fields.
description: 40 pages
A catalog of nearby accelerating star candidates in Gaia DR3
Creators: name: Whiting, Marc L.
name: Hill, Joshua B.
name: Bromley, Benjamin C.
name: Kenyon, Scott J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
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: We describe a new catalog of accelerating star candidates with Gaia $G\le 17.5$ mag and distances $d\le 100$ pc. Designated as Gaia Nearby Accelerating Star Catalog (GNASC), it contains 29,684 members identified using a supervised machine-learning algorithm trained on the Hipparcos-Gaia Catalog of Accelerations (HGCA), Gaia Data Release 2, and Gaia Early Data Release 3. We take advantage of the difference in observation timelines of the two Gaia catalogs and information about the quality of the astrometric modeling based on the premise that acceleration will correlate with astrometric uncertainties. Catalog membership is based on whether constant proper motion over three decades can be ruled out at high confidence (greater than 99.9%). Test data suggest that catalog members each have a 68% likelihood of true astrometric acceleration; subsets of the catalog perform even better, with the likelihood exceeding 85%. We compare the GNASC with Gaia Data Release 3 and its table of stars for which acceleration is detected at high confidence based on precise astrometric fits. Our catalog, derived without this information, captured over 96% of sources in the table that meet our selection criteria. In addition, the GNASC contains bright, nearby candidates that were not in the original Hipparcos survey, including members of known binary systems as well as stars with companions yet to be identified. It thus extends the HGCA and demonstrates the potential of the machine-learning approach to discover hidden partners of nearby stars in future astrometric surveys.
description: AJ accepted, 14 pages, 6 figures, 3 tables. Catalog available with publication
Distances to Galaxies from the Brightest Stars in the Universe
Creators: name: Kudritzki, R. -P.
name: Urbaneja, M. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Blue Supergiants (BSGs) are the brightest stars in the universe at visual light with absolute magnitudes up to Mv=-10 mag. They are ideal stellar objects for the determination of extragalactic distances, in particular, because the perennial uncertainties troubling most of the other stellar distance indicators, interstellar extinction and metallicity, do not affect them. The quantitative spectral analysis of low resolution spectra of individual BSGs provides accurate stellar parameters and chemical composition, which are then used to determine accurate reddening and extinction from photometry for each individual object. Accurate distances can be determined from stellar gravities and effective temperatures using the "Flux Weighted Gravity - Luminosity Relationship (FGLR)". Most recent results of the quantitative spectral analysis of BSGs in galaxies within and beyond the Local Group based on medium and low resolution spectra obtained with the ESO VLT and the Keck telescopes on Mauna Kea are presented and distances obtained with the FGLR-method are discussed together with the effects of patchy extinction and abundance gradients in galaxies. BSG metallicities and metallicity gradients are compared with results from strong-line HII region studies and the consequences for the empirical calibration of the metallicity dependence of the Cepheid period-luminosity relationship are pointed out. The perspectives of future work are discussed, the use of the giant ground-based telescopes of the next generation such as the TMT on Mauna Kea and the E-ELT and the tremendous value of the GAIA mission to allow for the ultimate calibration of the FGLR using galactic BSGs.
description: Review paper to appear in "The Fundamental Cosmic Distance Scale: State of the Art and GAIA Perspective" 2012, Astrophysics and Space Science, special issue, eds.: E. Brocato, G. Clementini, M. Marconi. (12 pages, 14 figures)
EFFECTS OF COMPUTER-ASSISTED INSTRUCTION USING MULTIPLE VIDEO EXEMPLARS TO INCREASE SAFETY SKILL KNOWLEDGE WITH STUDENTS WITH INTELLECTUAL DISABILITY
Creators: name: Shelton, Katherine E.
Publisher: name: University of Kentucky
Year: 2016
Subjects: subject: Special Education and Teaching

description: The purpose of the study was to assess the effect of a treatment package consisting of computer-assisted instruction using multiple video exemplars to teach safety skills to students with intellectual disability. A multiple probe across participants design was used to evaluate knowledge acquisition and the generalization of knowledge to the authentic setting (e.g, the school parking lot). The results showed training was effective in knowledge acquisition and improving skills demonstrated while crossing the parking lot.
Epistemic Insight 5 Minute Lesson Planning Template
Creators: name: LASAR Centre (Learning About Science And Religion)
Publisher: name: Zenodo
Year: 2019
Subjects: Epistemic Insight
Primary Education
Secondary Education
Initial Teacher Education
Cross-Curricular Learning
Pedagogy

description: This offers a quick 3 step process to begin planning an epistemically insightful learning experience. 1. Build on current practice - curriculum content / students’ understanding of methods and norms of thought and any curriculum mapping already undertaken. 2. Ask yourself & your students 3 key questions – these highlight the strengths & uniqueness of disciplines & help students to navigate the pedagogical engineering of subject division & curriculum content. 3. Helping students navigate the curriculum requires explicitly building links between disciplines and helping them understand the unique contributions disciplines can make to the same issue/question.
A multi-wavelength view of the multiple activity cycles of $ε$~Eridani
Creators: name: Fuhrmeister, B.
name: Coffaro, M.
name: Stelzer, B.
name: Mittag, M.
name: Czesla, S.
name: Schneider, P. C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: $ε$ Eridani is a highly active young K2 star with an activity cycle of about three years established using Ca II H & K line index measurements (S_MWO). This relatively short cycle has been demonstrated to be consistent with X-ray and magnetic flux measurements. Recent work suggested a change in the cyclic behaviour. Here we report new X-ray flux and S_MWO measurements and also include S_MWO measurements from the historical Mount Wilson program. This results in an observational time baseline of over 50 years for the S_MWO data and of over 7 years in X-rays. Moreover, we include Ca II infrared triplet (IRT) index measurements (S_IRT) from 2013-2022 in our study. With the extended X-ray data set, we can now detect the short cycle for the first time using a periodogram analysis. Near-simultaneous S_MWO data and X-ray fluxes, which are offset by 20 days at most, are moderately strongly correlated when only the lowest activity state (concerning short-term variability) is considered in both diagnostics. In the S_MWO data, we find strong evidence for a much longer cycle of about 34 years and an 11-year cycle instead of the formerly proposed $12$-year cycle in addition to the known 3-year cycle. The superposition of the three periods naturally explains the recent drop in S_MWO measurements. The two shorter cycles are also detected in the S_IRT data, although the activity cycles exhibit lower amplitudes in the S_IRT than in the S_MWO data. Finally, the rotation period of $ε$Eri can be found more frequently in the S_MWO as well as in the S_IRT data for times near the minimum of the long cycle. This may be explained by a scenario in which the filling factor for magnetically active regions near cycle maximum is too high to allow for notable short-term variations.
description: accepted to A&A
Monte Carlo simulations of magnetic ordering in the fcc Kagome lattice
Creators: name: Hemmati, V.
name: Plumer, M. L.
name: Whitehead, J. P.
name: Southern, B. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Monte Carlo simulation results are reported on magnetic ordering in ABC stacked Kagomé layers with fcc symmetry for both XY and Heisenberg models which include exchange interactions with the eight near-neighbors. Well known degeneracies of the 2D system persist in the 3D case and analysis of the numerical data provides strong evidence for a fluctuation-driven first-order transition to well-defined long-range order characterized as the layered $q=0$ (120-degree) spin structure. Effects of varying the inter-layer coupling are also examined. The results are relevant to understanding the role of frustration in IrMn$_3$ alloys widely used by the magnetic storage industry as thin-films in the antiferromagnetic pinning layer in GMR and TMR spin valves. Despite the technological importance of this structure, it has not previously been noted that the magnetic Mn-ions of fcc IrMn$_3$ form Kagomé layers.
description: 9 pages, 14 figures. Submitted to Phys. Rev. B
Sceptonia intestata Plassmann & Schacht 1990
Creators: name: El Mouden, Mohamed Amin
name: Chandler, Peter J.
name: Saidoun, Imane
name: Driauach, Ouafaa
name: Belqat, Boutaïna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Sceptonia
Sceptonia intestata

description: Sceptonia intestata Plassmann & Schacht, 1990
Material examined.
Morocco – Middle Atlas Region • 1 ♂; Vallée des oiseaux; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/24180 • 3 ♂♂; Forêt Admam; 22/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/24181.
North African distribution.
Morocco (Banamar et al. 2020).
description: Published as part of El Mouden, Mohamed Amin, Chandler, Peter J., Saidoun, Imane, Driauach, Ouafaa & Belqat, Boutaïna, 2025, A new species of Docosia Winnertz, 1864 and new records of fungus gnats (Diptera, Bolitophilidae, Keroplatidae and Mycetophilidae) from North Africa, pp. 349-379 in ZooKeys 1233 on pages 349-379, DOI: 10.3897/zookeys.1233.130502
Lithium Abundance Of The Solar-Type Superflare Stars
Creators: name: Honda, Satoshi
name: Notsu, Yuta
name: Maehara, Hiroyuki
name: Notsu, Shota
name: Shibayama, Takuya
name: Nogami, Daisaku
name: Shibata, Kazunari
Publisher: name: Zenodo
Year: 2015
Subjects: superflare
abundance
solar-type star

description: We performed the high dispersion spectroscopy of solar-type superflare stars by Subaru/HDS, and estimate the stellar parameters and lithium abundance of the stars to compare with the Sun. Our spectroscopic analysis of superflare stars show more than half of targets have no evidence of binary system and the stellar parameters are in the range of solar-type stars (Notsu et al. 2015a&b). We also investigate the correlations of Lithium abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of lithium by superflares. The derived lithium abundance in superflare stars do not show the correlation with stellar parameters. As compared with the lithium abundance in Hyades cluster which is younger than the sun, it is suggested that half of observed stars are young. However, there are some objects which show the low lithium and slowly rotate from the estimated v sin(i) and period of brightness variation. These results indicate that the superflare stars are not only young stars but also old stars like our sun. In our observations, we could not find the any evidence of lithium productions by superflare.
description: {"references": ["Maehara, H., et al. 2012, Nature, 485, 478", "Shibayama, T., et al. 2013, ApJS, 209, 5", "Notsu, Y., et al. 2015, PASJ, 67, 32", "Notsu, Y., et al. 2015, PASJ, 67, 33", "Honda, S., et al. 2015, PASJ 67, 85", "Herbig, G. H. 1965, ApJ, 141, 588", "Skumanich, A. 1972, ApJ, 171, 565", "Mishenina, T. V., et al. 2012, A&A, 547, A106", "Tatischeff, V., & Thibaud, J. P. 2007, A&A, 469, 265"]}
Some perturbation results for quasi-bases and other sequences of vectors
Creators: name: Bagarello, Fabio
name: Corso, Rosario
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss some perturbation results concerning certain pairs of sequences of vectors in a Hilbert space $\Hil$ and producing new sequences which share, with the original ones, { reconstruction formulas on a dense subspace of $\Hil$ or on the whole space}. We also propose some preliminary results on the same issue, but in a distributional settings.
description: To appear in Journal of Mathematical Physics
The Open Access revolution: from philosophy to transition
Creators: name: Waller, Andrew
name: Morrison, Heather
Publisher: name: University of Calgary
Year: 2011
Subjects: subject: Library & Information Science
subject: Open Access
subject: OA
subject: Library associations
subject: Support for Open Access
subject: Growth of Open Access
subject: Digital preservation

description: Presented at the Alberta Library Conference 2011: Open Doors, Open Minds, Open Access, April 29, 2011.
description: Librarians have been advocating for Open Access for many years. Today, concrete steps are being taken towards a future for scholarly communication that will be largely open access. In addition to peer-reviewed journals, many other materials are increasingly becoming freely available, including monographs, government and scholarly data, and educational materials including textbooks and learning objects. In addition to expanded access, OA will facilitate new relationships between the academy and society, and there are roles for all kinds of libraries to support these new relationships. For example, professionals, journalists, businesspeople, local politicians and government staff increasingly have access to many of the resources that were once available only at a large university library.
Millimeter-Wave Polarization Of Protoplanetary Disks Due To Dust Scattering
Creators: name: Kataoka, Akimasa
Publisher: name: Zenodo
Year: 2016

description: We found a new mechanism of millimeter-wave polarization of protoplanetary disks; the self-scattering. If the dust distribution has anisotropies such as ring or lopsided structure, the thermal emission is scattered by large dust grains to emit polarization at millimeter wavelengths. This will be a new probe of grain growth in protoplanetary disks. We also show an application to HL Tau.
description: T. Muto (Kogakuin U.), M. Momose, T. Tsukagoshi (Ibaraki U.), M. Fukagawa (Nagoya U.), H. Shibai (Osaka U.), T. Hanawa (Chiba U.), K. Murakawa  Osaka-S.), Kees Dullemond, Adriana Pohl (Heidelberg)
Behavior of Solar Cycles 23 and 24 Revealed by Microwave Observations
Creators: name: Gopalswamy, N.
name: Yashiro, S.
name: Mäkelä, P.
name: Michalek, G.
name: Shibasaki, K.
name: Hathaway, D. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using magnetic and microwave butterfly diagrams, we compare the behavior of solar polar regions to show that (i) the polar magnetic field and the microwave brightness temperature during the solar minimum substantially diminished during the cycle 23/24 minimum compared to the 22/23 minimum. (ii) The polar microwave brightness temperature (b) seems to be a good proxy for the underlying magnetic field strength (B). The analysis indicates a relationship, B = 0.0067Tb - 70, where B is in G and Tb in K. (iii) Both the brightness temperature and the magnetic field strength show north-south asymmetry most of the time except for a short period during the maximum phase. (iv) The rush-to-the-pole phenomenon observed in the prominence eruption activity seems to be complete in the northern hemisphere as of March 2012. (v) The decline of the microwave brightness temperature in the north polar region to the quiet-Sun levels and the sustained prominence eruption activity poleward of 60oN suggest that solar maximum conditions have arrived at the northern hemisphere. The southern hemisphere continues to exhibit conditions corresponding to the rise phase of solar cycle 24.
description: 19 pages, 4 figures, accepted for publication in ApJ Letters on April 10, 2012
Austrian National Contribution : Regulation Of Labour Market Intermediaries And Role Of The Social Partners In Preventing Trafficking Of Labour
Creators: name: Altreiter, Carina
Publisher: name: Zenodo
Year: 2016
Subjects: Labour mobility
Temporary employment
Social partners
Labour law
Free movement of citizens
Austria

description: Austrian national contribution to the report Regulation of labour market intermediaries and the role of social partners in preventing trafficking of labour, published by Eurofound.
description: Disclaimer: This information is made available as a service to the public but has not been edited by the European Foundation for the Improvement of Living and Working Conditions. The content is the responsibility of the authors.
Epistemic Insight Bubble Tool
Creators: name: LASAR Centre (Learning About Science And Religion)
Publisher: name: Zenodo
Year: 2019
Subjects: Epistemic Insight
Primary Education
Secondary Education
Cross-Curricular Learning
Pedagogy

description: The Epistemic Insight Bubble Tool provides a strong visual to highlight the powers and limitations science. Is science able to answer the question effectively or does it need other disciplines to inform it? Does the question need to be reframed to address part of, or an interpretation of the question scientifically? When examining Big Questions this can be used to consider how science may inform our thinking through organising smaller questions that are part of the Big Question.
Hall Magnetohydrodynamics Simulations of Hall-Physics-Driven Effects in Low-Density Plasmas Surrounding Dense Z-Pinch Liners
Creators: name: Woolstrum, Jeffrey
Publisher: name: My University
Year: 2022
Subjects: subject: Plasma
subject: High energy density physics
subject: z-pinch
subject: Hall physics
subject: fusion energy
subject: Nuclear Engineering and Radiological Sciences
subject: Engineering

description: Presented in this dissertation is a new Hall physics driven mechanism for describing the seeding and formation of helical instability structures in axially premagnetized thin-foil liner z-pinch implosions driven by the 1-MA, 100-ns MAIZE pulsed power generator at the University of Michigan. This mechanism involves several effects within a low-density coronal plasma layer around the thin-foil liner that forms when the driving current pulse is applied. This low-density coronal layer is then subject to Hall physics, specifically a Hall interchange instability, which leads to several effects including current advection, current vortices, magnetic field advection, axial flux amplification, and other phenomena that all contribute to a helical seeding of the magneto-Rayleigh-Taylor instability (MRTI). These Hall physics effects are studied numerically using the 3D Hall magnetohydrodynamics code, PERSEUS [C.E. Seyler and M.R. Martin, Phys. Plasmas 18, 012703 (2011)]. This study has important implications for the magnetized liner inertial fusion (MagLIF) program at Sandia National Laboratories, where similar helical instability structures have been observed in axially premagnetized thick-walled liner implosions on the 18-30 MA Z facility. This dissertation also used PERSEUS to explore the late time effects of the on-axis support rod used to hold the thin-foil liners upright in the MAIZE facility as well as make a comparison of MRTI behavior between simulation and experiment. The simulation results [J.M. Woolstrum, et. al., Phys. Plasmas 27, 092705 (2020)] show that by limiting the maximum implosion convergence obtainable, the on-axis support rod plays a key role in preserving the integrity of the helical MRTI structures beyond the implosion phase, into the stagnation and explosion phases of the experiments (as observed on MAIZE [D.A. Yager-Elorriaga, et. al., Phys. Plasmas 25, 056307 (2018)]). The simulation results also show that if the support rod were removed, the morphology of the stagnation column during the explosion phase would be determined by the morphology of the precursor plasma column that establishes itself on axis prior to the arrival of the bulk of the imploding liner material.
Distorted stability pattern and chaotic features for quantized prey-predator-like dynamics
Creators: name: Bernardini, Alex E.
name: Bertolami, Orfeu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Non-equilibrium and instability features of prey-predator-like systems associated to topological quantum domains emerging from a quantum phase-space description are investigated in the framework of the Weyl-Wigner quantum mechanics. Reporting about the generalized Wigner flow for one-dimensional Hamiltonian systems, $\mathcal{H}(x,\,k)$, constrained by $\partial^2 \mathcal{H} / \partial x \, \partial k = 0$, the prey-predator dynamics driven by Lotka-Volterra (LV) equations is mapped onto the Heisenberg-Weyl non-commutative algebra, $[x,\,k] = i$, where the canonical variables $x$ and $k$ are related to the two-dimensional LV parameters, $y = e^{-x}$ and $z = e^{-k}$. From the non-Liouvillian pattern driven by the associated Wigner currents, hyperbolic equilibrium and stability parameters for the prey-predator-like dynamics are then shown to be affected by quantum distortions over the classical background, in correspondence with non-stationarity and non-Liouvillianity properties quantified in terms of Wigner currents and Gaussian ensemble parameters. As an extension, considering the hypothesis of discretizing the time parameter, non-hyperbolic bifurcation regimes are identified and quantified in terms of $z-y$ anisotropy and Gaussian parameters. The bifurcation diagrams exhibit, for quantum regimes, chaotic patterns highly dependent on Gaussian localization. Besides exemplifying a broad range of applications of the generalized Wigner information flow framework, our results extend, from the continuous (hyperbolic regime) to discrete (chaotic regime) domains, the procedure for quantifying the influence of quantum fluctuations over equilibrium and stability scenarios of LV driven systems.
description: 23 pages, 6 figures
Strongly Warped BPS Domain Walls
Creators: name: Masoumi, Ali
name: Yang, I-Sheng
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present analytical solutions of BPS domain walls in the Einstein-Maxwell flux landscape. We also remove the smeared-branes approximation and write down solutions with localized branes. In these solutions the domain walls induce strong (if not infinite) warping.
description: 16 pages, 4 figures, v2, citations added and minor corrections
The Open Access (OA) suite at the University of Calgary: analysis and evaluation
Creators: name: Westell, Mary E.
name: Waller, Andrew
Publisher: name: University of Calgary
Year: 2011
Subjects: subject: Library & Information Science
subject: Open Access
subject: OA
subject: University of Calgary
subject: Libraries and Cultural Resources
subject: Centre for Scholarly Communication
subject: Evaluation

description: Presented at the Alberta Library Conference 2011: Open Doors, Open Minds, Open Access, April 30, 2011.
description: Over the last few years, Libraries and Cultural Resources (LCR) at the University of Calgary has built a suite of open access (OA)-related services. These include one of the largest institutional repositories in Canada, the first Open Access Authors Fund in Canada, a comprehensive digitization program, and OA journals and monographs in the University of Calgary Press. While these programs have been popular, there are important questions that need to be asked in terms of analysis of the LCR OA suite. How can the programs be evaluated? What constitutes success and impact? Are the programs meeting ever-changing user needs? Are the elements of the suite in line with what is happening in the OA community?
The Inner Rim Of 51 Haebe Protoplanetary Disks. A Vlti-Pionier Survey
Creators: name: Lazareff, B.
Publisher: name: Zenodo
Year: 2016

description: We establish the following results:

(a) Dust Tsub ~1800K.

(b) Ring structure.

(c) 1.65µm emission region is wide (Delta_r/r~0.5), favoring recent physical rim models.

(d) Disk thickness  z/h~0.2, larger than hydrostatic scaleheight

(e) Extended (>>1AU) flux component; correlated with disk flaring indicators and group status.

(f) Confirm and extend the size-luminosity relationship.

(1) Authorship:

B. Lazareff, J.-P. Berger , J. Kluska, J.-B. Le Bouquin, C. Pinte, W.-F. Thi, and 15 more co-authors.
description: Presented by Jean-Philippe Berger ||
J.-P. Berger, J. Kluska, J.-B. Le Bouquin, M. Benisty, F. Malbet, C. Koen, C. Pinte, W.-F. Thi, O. Absil, F. Baron, A. Delboulbé, G. Duvert, A. Isella, L. Jocou, A. Juhasz, S. Kraus, R. Lachaume, F. Ménard, R. Millan-Gabet, J. Monnier, K. Perraut, F. Soulez, M. Tallon, E. Thiébaut, W. Traub and G. Zins
Visualization of Photonic Band Structures via Far-field Measurements in SiNx Photonic Crystal Slabs
Creators: name: Lan, Wenze
name: Fu, Peng
name: Ji, Chang-Yin
name: Wang, Gang
name: Yao, Yugui
name: Gu, Changzhi
name: Liu, Baoli
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The band structures of the photonic crystal slabs play a significant role in manipulating the flow of light and pre-dicting exotic physics in photonics. In this letter, we show that the key features of photonic band structures can be achieved experimentally by the polarization- and momentum-resolved photoluminescence spectroscopy utilizing the light emission properties of SiNx. The two-dimensional spectra clearly reveal the energy-momentum dispersion of band structures which is in perfect agreement with the simulation results. The isofrequency contours can be measured easily by adding a bandpass filter with a desired photon energy. Furthermore, it is convenient to observe clearly and directly the optical singularity -- the optical bound states in the continuum featured by dark point in three-dimensional photoluminescence spectra. The polarization-resolved isofrequency contours clearly show that this dark point is the center of an azimuthally polarized vortex. Finally, the helical topological edge states can be easily observed in photonic topological insulators with deformed hexagonal lattices. Our work provides a simple and effective approach for exploring topological photonics and other intriguing phenomena hidden in the photonic crystal slabs.
description: 6 pages, 5 figures
Ag and N acceptors in ZnO: ab initio study of acceptor pairing, doping efficiency, and the role of hydrogen
Creators: name: Volnianska, O.
name: Boguslawski, P.
name: Kaminska, E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Efficiency of ZnO doping with Ag and N shallow acceptors, which substitute respectively cations and anions, was investigated. First principles calculations indicate a strong tendency towards formation of nearest neighbor Ag-N pairs and N-Ag-N triangles. Binding of acceptors stems from the formation of quasi-molecular bonds between dopants, and has a universal character in semiconductors. The pairing increases energy levels of impurities, and thus lowers doping efficiency. In the presence of donors, pairing is weaker or even forbidden. However, hydrogen has a tendency to form clusters with Ag and N, which favors the Ag-N aggregation and lowers the acceptor levels of such complexes.
description: 10 pages, 4 figures
Uncertainty principle from the noise of gravitons
Creators: name: Sen, Soham
name: Gangopadhyay, Sunandan
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The effect of the noise induced by gravitons in the case of a freely falling particle from the viewpoint of an external observer has been recently calculated in \href{https://link.aps.org/doi/10.1103/PhysRevD.107.066024}{Phys. Rev. D 107 (2023) 066024}. There the authors have calculated the quantum gravity modified Newton's law of free fall where the spacetime has been considered to be weakly curved. In our work, we extend this work by calculating the variance in the velocity and eventually the momentum of the freely falling massive particle. From this simple calculation, we observe that the product of the standard deviation in the position with that of the standard deviation in momentum picks up a higher order correction which is proportional to the square of the standard deviation in momentum. We also find out that in the Planck limit (both Planck length and Planck mass), this uncertainty product gives the well-known form of the generalized uncertainty principle. We then calculate a similar uncertainty product when the graviton is in a squeezed state, and eventually, we get back the same uncertainty product. Finally, we extend our analysis for the gravitons being in a thermal state and obtain a temperature-dependent uncertainty product. If one replaces this temperature with the Planck temperature and the mass of the particle by the Planck mass, the usual uncertainty product appears once again. We also obtain an upper bound of the uncertainty product thereby giving a range of the product of the variances in position and momentum.
description: 11 pages LATEX
Citizen and City Science as Next Steps of Open Science - Brno
Creators: name: Marek, Jiří
Publisher: name: Zenodo
Year: 2020
Subjects: citizen science

description: Jiří Marek (Masaryk University) presented "Citizen and City Science as Next Steps of Open Science - Brno" at the EUA and OpenAIRE workshop "University approaches to Citizen Science in the transition to Open Science - Institutional opportunities and challenges for creating an open and inclusive environment for Research". For more information, see: https://www.openaire.eu/university-approaches-to-citizen-science