cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Recurrent frequency-size distribution of characteristic events
Creators: name: Abaimov, S. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Many complex systems, including sand-pile models, slider-block models, and earthquakes, have been discussed whether they obey the principles of self-organized criticality. Behavior of these systems can be investigated from two different points of view: interoccurrent behavior in a region and recurrent behavior at a given point on a fault or at a given fault. The interoccurrent frequency-size statistics are known to be scale-invariant and obey the power-law Gutenberg-Richter distribution. This paper investigates the recurrent frequency-size behavior of characteristic events at a given point on a fault or at a given fault. For this purpose sequences of creep events at a creeping section of the San Andreas fault are investigated. The applicability of the Brownian passage-time, lognormal, and Weibull distributions to the recurrent frequency-size statistics of slip events is tested and the Weibull distribution is found to be a best-fit distribution. To verify this result the behaviors of the numerical slider-block and sand-pile models are investigated and the applicability of the Weibull distribution is confirmed. Exponents of the best-fit Weibull distributions for the observed creep event sequences and for the slider-block model are found to have close values from 1.6 to 2.2 with the corresponding aperiodicities of the applied distribution from 0.47 to 0.64.
description: Minor corrections
A New Hubble Space Telescope Distance to NGC 1569: Starburst Properties and IC 342 Group Membership
Creators: name: Grocholski, Aaron J.
name: Aloisi, Alessandra
name: van der Marel, Roeland P.
name: Mack, Jennifer
name: Annibali, Francesca
name: Angeretti, Luca
name: Greggio, Laura
name: Held, Enrico V.
name: Romano, Donatella
name: Sirianni, Marco
name: Tosi, Monica
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present deep HST ACS/WFC photometry of the dwarf irregular galaxy NGC 1569, one of the closest and strongest nearby starburst galaxies. These data allow us, for the first time, to unequivocally detect the tip of the red giant branch and thereby determine the distance to NGC 1569. We find that this galaxy is 3.36 +/- 0.20 Mpc away, considerably farther away than the typically assumed distance of 2.2 +/- 0.6 Mpc. Previously thought to be an isolated galaxy due to its shorter distance, our new distance firmly establishes NGC 1569 as a member of the IC 342 group of galaxies. The higher density environment may help explain the starburst nature of NGC 1569, since starbursts are often triggered by galaxy interactions. On the other hand, the longer distance implies that NGC 1569 is an even more extreme starburst galaxy than previously believed. Previous estimates of the rate of star formation for stars younger than ~ 1 Gyr become stronger by more than a factor of 2. Stars older than this were not constrained by previous studies. The dynamical masses of NGC 1569's three super star clusters, which are already known as some of the most massive ever discovered, increase by ~53% to 6-7x10^5 solar masses.
description: Submitted to ApJ Letters. 5 pages, including 4 reduced-resolution figures. A pdf version with full-resolution figures can be found here: http://www.stsci.edu/~aarong/astro_ph/ngc1569_trgb.pdf
Millimeter Imaging of HH 24 MMS: A Misaligned Protobinary System
Creators: name: Kang, Miju
name: Choi, Minho
name: Ho, Paul T. P.
name: Lee, Youngung
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The HH 24 MMS protostellar system was observed in the 6.9 mm continuum with a high angular resolution (0.5"). HH 24 MMS was resolved into two sources. The separation between sources 1 and 2 is ~0.9" or 360 AU. The spectral energy distribution suggests that the 6.9 mm flux is almost entirely from dust. The 6.9 mm image and the spectrum suggest that HH 24 MMS may be a protostellar binary system. Total mass including the accretion disks and the inner protostellar envelope is ~1.4 Msun. Disk masses of sources 1 and 2 are 0.6 and 0.3 Msun, respectively. Both sources are highly elongated. The difference in the position angle of the two disks is ~45 degree, which means that HH 24 MMS is a highly misaligned protobinary system. The misalignment suggests that turbulent fragmentation may be the formation mechanism relevant to the binary systems with a separation of a few hundreds of AU, such as the HH 24 MMS system.
description: 5 pages and 2 figures, Accepted for publication in ApJ
Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
Creators: name: Jacques, V.
name: Neumann, P.
name: Beck, J.
name: Markham, M.
name: Twitchen, D.
name: Meijer, J.
name: Kaiser, F.
name: Balasubramanian, G.
name: Jelezko, F.
name: Wrachtrup, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report a versatile method to efficiently polarize single nuclear spins in diamond, which is based on optical pumping of a single NV color center and mediated by a level-anti crossing in its excited state. A nuclear spin polarization higher than 98% is achieved at room temperature for the 15N nuclear spin associated to the NV center, corresponding to $μ$K effective nuclear spin temperature. We then show simultaneous deterministic initialization of two nuclear spins (13C and 15N) in close vicinity to a NV defect. Such robust control of nuclear spin states is a key ingredient for further scaling up of nuclear-spin based quantum registers in diamond.
description: 4 pages, 4 figures
On supersymmetry at finite temperature
Creators: name: Caron-Huot, Simon
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the effective theories governing the sensitivity to the plasma of certain high-energy observables in supersymmetric plasmas, and point out that they preserve supersymmetry. Our findings generalize previous observations on symptotic thermal masses in weakly coupled plasmas, to both the real and imaginary parts of self-energies, on the light cone and away from it, in weakly and strongly interacting theories. All observed supersymmetry violations due to thermal effects vanish faster than $E^{-2}$ in the high energy limit.
description: 15 pages, 3 figures
Chaotic singular maps
Creators: name: Cosenza, M. G.
name: Alvarez-LLamoza, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider a family of singular maps as an example of a simple model of dynamical systems exhibiting the property of robust chaos on a well defined range of parameters. Critical boundaries separating the region of robust chaos from the region where stable fixed points exist are calculated on the parameter space of the system. It is shown that the transitions to robust chaos in these systems occur either through the routes of type-I or type-III intermittency and the critical boundaries for each type of transition have been determined on the phase diagram of the system. The simplicity of these singular maps and the robustness of their chaotic dynamics make them useful ingredients in the construction of models and in applications that require reliable operation under chaos.
description: 4 pages, 4 figures, accepted in Ciencia
Conserved Quantities and the Algebra of Braid Excitations in Quantum Gravity
Creators: name: He, Song
name: Wan, Yidun
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We derive conservation laws from interactions of braid-like excitations of embedded framed spin networks in Quantum Gravity. We also demonstrate that the set of stable braid-like excitations form a noncommutative algebra under braid interaction, in which the set of actively-interacting braids is a subalgebra.
description: 26 pages, discussion expanded, accepted by Nucl. Phys. B
Tuning of energy levels and optical properties of graphene quantum dots
Creators: name: Zhang, Z. Z.
name: Chang, Kai
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate theoretically the magnetic levels and optical properties of zigzag- and armchair-edged hexagonal graphene quantum dots (GQDs) utilizing the tight-binding method. A new bound edge state at zero energy appears for the zigzag GQDs in the absence of a magnetic field. The magnetic levels of GQDs exhibit a Hofstadter-butterfly spectrum and approach the Landau levels of two-dimensional graphene as the magnetic field increases. The optical properties are tuned by the size, the type of the edge, and the external magnetic field.
description: 5 pages, 7 figures. to appear in Phys. Rev. B
Front Propagation with Rejuvenation in Flipping Processes
Creators: name: Antal, T.
name: ben-Avraham, D.
name: Ben-Naim, E.
name: Krapivsky, P. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Data Structures and Algorithms (cs.DS)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We study a directed flipping process that underlies the performance of the random edge simplex algorithm. In this stochastic process, which takes place on a one-dimensional lattice whose sites may be either occupied or vacant, occupied sites become vacant at a constant rate and simultaneously cause all sites to the right to change their state. This random process exhibits rich phenomenology. First, there is a front, defined by the position of the left-most occupied site, that propagates at a nontrivial velocity. Second, the front involves a depletion zone with an excess of vacant sites. The total excess D_k increases logarithmically, D_k ~ ln k, with the distance k from the front. Third, the front exhibits rejuvenation -- young fronts are vigorous but old fronts are sluggish. We investigate these phenomena using a quasi-static approximation, direct solutions of small systems, and numerical simulations.
description: 10 pages, 9 figures, 4 tables
Numerical simulations of general gravitational singularities
Creators: name: Garfinkle, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper covers some of the current techniques and issues involved in performing numerical simulations of the formation of singularities.
description: This work was part of the 2006 AEI conference on New Frontiers in Numerical Relativity and was published in an issue of Classical and Quantum Gravity on that conference
Electroproduction of electron-positron pair in a medium
Creators: name: Baier, V. N.
name: Katkov, V. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The process of electron-positron pair creation by a high-energy electron in a medium is analyzed. The spectral distribution over energies of created particles is calculated for the direct and cascade mechanisms of the process. The Coulomb corrections are included. The new formulation of the equivalent photons method is developed which takes into account the influence of multiple scattering. It is shown the effects of multiple scattering can be quite effectively studied in the process under consideration.
description: 10 pages, 4 figures
Gamma Rays from Ultra-High Energy Cosmic Rays in Cygnus A
Creators: name: Atoyan, Armen
name: Dermer, Charles D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Ultra-high energy cosmic rays (UHECRs) accelerated in the jets of active galactic nuclei can accumulate in high magnetic field, ~100 kpc-scale regions surrounding powerful radio galaxies. Photohadronic processes involving UHECRs and photons of the extragalactic background light make ultra-relativistic electrons and positrons that initiate electromagnetic cascades, leading to the production of a gamma-ray synchrotron halo. We calculate the halo emission in the case of Cygnus A and show that it should be detectable with the Fermi Gamma ray Space Telescope and possibly detectable with ground-based gamma-ray telescopes if radio galaxies are the sources of UHECRs.
description: 9 pages, 2 figures, extended calculations, added references; ApJL, in press
Repulsive shield between polar molecules
Creators: name: Gorshkov, A. V.
name: Rabl, P.
name: Pupillo, G.
name: Micheli, A.
name: Zoller, P.
name: Lukin, M. D.
name: Büchler, H. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose and analyze a technique that allows to suppress inelastic collisions and simultaneously enhance elastic interactions between cold polar molecules. The main idea is to cancel the leading dipole-dipole interaction with a suitable combination of static electric and microwave fields in such a way that the remaining van-der-Waals-type potential forms a three-dimensional repulsive shield. We analyze the elastic and inelastic scattering cross sections relevant for evaporative cooling of polar molecules and discuss the prospect for the creation of crystalline structures.
description: 4 pages, 3 figures
Use of Astronomical Literature - A Report on Usage Patterns
Creators: name: Henneken, Edwin A.
name: Kurtz, Michael J.
name: Accomazzi, Alberto
name: Grant, Carolyn S.
name: Thompson, Donna
name: Bohlen, Elizabeth
name: Murray, Stephen S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Digital Libraries (cs.DL)
subject: Astrophysics (astro-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In this paper we present a number of metrics for usage of the SAO/NASA Astrophysics Data System (ADS). Since the ADS is used by the entire astronomical community, these are indicative of how the astronomical literature is used. We will show how the use of the ADS has changed both quantitatively and qualitatively. We will also show that different types of users access the system in different ways. Finally, we show how use of the ADS has evolved over the years in various regions of the world. The ADS is funded by NASA Grant NNG06GG68G.
description: 12 pages, 8 figures, 2 tables. Accepted by Journal of Informetrics
Exploring design to environment methods though grassroots initiatives
Creators: name: Rio, Maud
name: Tyl, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Targeting sustainability in our industrial society requires integrating specific criteria in the design process of products and processes. A paradigm shift is necessary in the economical, social and political systems to ensure the natural ecosystems preservation on the planet while fulfilling society needs. Various research methods have therefore emerged to change the way products and services are designed, developed, used and discarded considering territorial contexts. Design for Sustainability, Design for Sustainable Transition, Socially Responsible Design, post-growth design, etc. provide several methods integrating the sustainable principles in the design process. However those approaches remain mainly experimental and are limited to the industrial context. In parallel to those approaches a wide variety of grassroots initiatives have emerged in territories. They propose alternative ways to design systems and they integrate new constraints in a practical manner. This research therefore aims to confront the diversity of Design to Environment (DtE) approaches with 'grassroots' initiatives in order to understand the possible evolution of the integration of sustainability into the design process of products and services used in industry. This paper presents the first literature review results of a started project in 2020. An original research protocol is proposed in this paper, based on specific focus groups with grassroots initiatives practitioners and eco-design experts from research and industry. The presentation of four DtE frameworks are analysed in this paper. This research finally discusses the opportunity of integrating the grassroots enriched DtE frameworks by non-officialdesigners in life cycle engineering. This bottom-up process may drive an expression of sustainability in industry aligned with some emerging local socio-technical systems.
Self-care Ethics: Towards Enhancing the Translator’s Agency and Symbolic Recognition
Creators: name: Boukhaffa, Abderrahman
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2021
Subjects: capital
code of ethics
moral self
professionalization
recognition
self-care
transformative learning

description: The late 20th century attempts at the professionalization of translation as a modern system – with professional associations as its organizing institutions – have been accompanied by the ‘need’ to codify and regulate ethical issues. The purpose of this process of ‘professionalization’ and, by extension, ethics codification as a part of that process, is to reduce doubt and uncertainty between the different agents involved in the translation occupation, on the one hand, and impose the translator’s recognition, on the other hand – as we learn from the sociology of professions. Within this context, a number of translator associations have created codes of ethics , adopting a deontological approach based on a priori principles. Precise solutions have been proposed in these documents to respond to the ethical issues that arise in translation. This thesis argues that these solutions are problematic as they may not only ignore the complex nature of ethical encounters but may also impact on the translator’s empowerment. The study demonstrates how codes of ethics – supposedly one of the traits of professionalism, which is equated with symbolic recognition and self-control of one’s occupation in the sociology of professions – may be internal sites where a low status of the translator is reinforced and an external control is discerned. Also, the thesis shows how in the name of ethics, these documents may be sites where ‘ethics’ function as ideologies of alienation and where the translator’s ethics per se are neutralized. It also examines how codes may impact on those beyond the circle of translation, as a consequence. Drawing on Pierre Bourdieu’s and Zygmunt Bauman’s sociologies, the current project investigates the codes/charter of ethics of a selection of national/provincial and international associations, in addition to the UNESCO Nairobi Recommendation, in order to find out how they impact on the translator's capital and moral self. Drawing on Michel Foucault’s notion of Epimeleia Heautou (self-care) and transformative learning theory, the study proposes alternative ethics to the current codes of ethics.
Dynamic problems in computational geometry
Creators: name: Gowda, Ihor George
Publisher: name: University of British Columbia
Year: 2010

description: Computational geometry is the study of algorithms for manipulating sets of points, lines, polygons, planes and other geometric objects. For many problems in this realm, the sets considered are static and the data structures representing them do not permit efficient insertion and deletion of objects (e.g. points). Dynamic problems, in which the set and the geometric data structure change over time, are also of interest. The topic of this thesis is the presentation of fast algorithms for fully dynamic maintenance of some common geometric structures. The following configurations are examined: planar nearest-point and farthest-point Voronoi diagrams, convex hulls (in two and three dimensions), common intersection of halfspaces (2-D and 3-D), and contour of maximal vectors (2-D and 3-D). The principal techniques exploited are fast merging of substructures, and the use of extra storage. Dynamic geometric search structures based upon the configurations are also presented.
La variabilité de la performance pianistique : une revue exploratoire
Creators: name: Séguin, Nicholas
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2021
Subjects: Performance pianistique
Variabilité
Expertise
Système neuromusculaire
Cognition

description: Lorsqu’un mouvement est répété à plusieurs reprises, certaines différences subtiles peuvent être observées entre les répétitions de ce mouvement. Cette variabilité du mouvement et ses implications ont reçu beaucoup d’attention dans le domaine de la biomécanique, mais moins dans le domaine de la performance pianistique. En se basant sur les connaissances acquises dans le domaine de la biomécanique, cette revue exploratoire avait pour but de rassembler les informations recueillies jusqu’à présent quant à la variabilité de la performance pianistique en un seul document afin d’élucider certains enjeux : (i) quels outils techniques et méthodes d’analyse ont été employés afin de mesurer la performance pianistique et sa variabilité ; (ii) quelle est l’influence de l’expertise sur cette variabilité et ; (iii) combien d’essais devraient être employés dans un protocole de recherche afin d’obtenir une évaluation fiable de la performance pianistique. À l’aide des données récoltées, cette revue offre plusieurs recommandations aux chercheurs tenant à prendre en compte l’impact de la variabilité du mouvement et identifie les lacunes dans notre compréhension de la variabilité afin de proposer certaines avenues de recherche futures. Cette thèse démontre l’importance de conduire plus d’enquêtes sur la variabilité de la performance pianistique qui pourront contribuer à notre compréhension du système neuromusculaire et des processus cognitifs qui gouvernent la performance, ainsi qu’à l’implémentation de protocoles de recherche plus robustes.
Comme chez soi : le sentiment d’appartenance de diplômés d’écoles secondaires de langue française de l’Ontario lors de leur première année à l’université
Creators: name: Faubert, Nicholas
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2021
Subjects: Sentiment d'appartenance
Francophone minoritaire
Transition
Université

description: Le point de vue des étudiants et les minorités linguistiques sont peu présents dans la recherche sur la transition scolaire et l’expérience étudiante à l’université (Lamoureux, 2007; Lamoureux et coll., 2013; Tinto, 2017). Notre recherche porte sur le sentiment d’appartenance chez des étudiants diplômés d’écoles secondaires de langue française de l’Ontario lors de leur première année universitaire. Dans la présente étude, nous avons fait une utilisation secondaire de données provenant de 17 groupes de discussion réalisés auprès de 88 étudiants. Une analyse de contenu a été effectuée selon trois concepts, soit l’appartenance à l’institution, les relations sociales et le métier d’étudiant. Les résultats montrent qu’au premier trimestre, les étudiants sont en mode de survie et ont de la difficulté à trouver l’équilibre entre leur vie sociale et académique. Au deuxième trimestre, des moments de prise de conscience ont permis à plusieurs participants de comprendre ce sur quoi ils devaient travailler pour se sentir plus à l’aise à l’université. Cette étude contribue à la recherche sur le sentiment d’appartenance à l’université chez une population francophone minoritaire dans la mesure où nous avons montré de quelle façon celui-ci se développe lors de la première année d’études universitaires.
Testing the evolution theory of massive binary systems
Creators: name: Mahy, L.
name: Sana, H.
name: Martins, F.
name: Rauw, G.
name: Abdul-Masih, M.
name: Almeida, L. A.
name: Langer, N.
name: Sen, K.
name: Shenar, T.
name: de Koter, A.
name: de Mink, S. E.
name: Evans, C. J.
name: Moffat, A. F. J.
name: Simón-Díaz, S.
name: Schneider, F. R. N.
name: Barbá, R.
name: Clark, J. S.
name: Fabry, M.
name: Crowther, P.
name: Gräfener, G.
name: Lennon, D. J.
name: Tramper, F.
name: Vink, J. S.
Publisher: name: Zenodo
Year: 2021
Subjects: stars: massive
binaries: general
stars: fundamental parameters
stars: abundances
stars: individual: 30 Doradus

description: Massive stars are often found to be in pairs. This configuration is both a blessing and a curse. From it, we can estimate their exact properties such as their masses but the interactions that result during their life considerably affect the way that the stars evolve. To understand how the stars evolve when they are in pair and what are the effects of these interactions on the stellar properties, we undertook a large study of more than 60 massive binaries at Galactic and LMC metallicities using spectral disentangling, atmosphere modelling and light curve fitting to determine their stellar parameters, and surface abundances. This unique dataset is the largest sample of binaries composed of at least one O-type star to be studied in such a homogeneous way. It allows us to give strong observational constraints to test theoretical binary evolutionary tracks, to probe rotational and tidal mixings and mass transfer episodes.
description: {"references": ["Brott, I., et al. 2011, A&A, 530, A115", "Grin, N. J., et al. 2017, A&A, 600, A82", "Hadrava, P. 1995, A&AS, 114, 393", "Hillier, D. J. & Miller, D. L. 1998, ApJ, 496, 407", "Paxton, B., et al. 2015, ApJS, 220, 15", "Simon, K. P. & Sturm, E. 1994, A&A, 281, 286"]}
Phase transition in SONFIS&SORST
Creators: name: Owladeghaffari, Hamed
Publisher: name: arXiv
Year: 2008
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: F.4.1

description: In this study, we introduce general frame of MAny Connected Intelligent Particles Systems (MACIPS). Connections and interconnections between particles get a complex behavior of such merely simple system (system in system).Contribution of natural computing, under information granulation theory, are the main topics of this spacious skeleton. Upon this clue, we organize two algorithms involved a few prominent intelligent computing and approximate reasoning methods: self organizing feature map (SOM), Neuro- Fuzzy Inference System and Rough Set Theory (RST). Over this, we show how our algorithms can be taken as a linkage of government-society interaction, where government catches various fashions of behavior: solid (absolute) or flexible. So, transition of such society, by changing of connectivity parameters (noise) from order to disorder is inferred. Add to this, one may find an indirect mapping among financial systems and eventual market fluctuations with MACIPS. Keywords: phase transition, SONFIS, SORST, many connected intelligent particles system, society-government interaction
description: submitted to :The Sixth International Conference on Rough Sets and Current Trends in Computing; Akron, Ohio, USA,2008
Molecular Thin Films: a New Type of Magnetic Switch
Creators: name: Heutz, S. M.
name: Mitra, C.
name: Wu, W.
name: Fisher, A. J.
name: Kerridge, A.
name: Stoneham, A. M.
name: Harker, A. H.
name: Gardener, J.
name: Tseng, Hsiang-Han
name: Jones, T. S.
name: Renner, C.
name: Aeppli, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The design and fabrication of materials that exhibit both semiconducting and magnetic properties for spintronics and quantum computing has proven difficult. Important starting points are high-purity thin films as well as fundamental theoretical understanding of the magnetism. Here we show that small molecules have great potential in this area, due to ease of insertion of localised spins in organic frameworks and both chemical and structural purity. In particular, we demonstrate that archetypal molecular semiconductors, namely the metal phthalocyanines (Pc), can be readily fabricated as thin film quantum antiferromagnets, important precursors to a solid state quantum computer. Their magnetic state can be switched via fabrication steps which modify the film structure, offering practical routes into information processing. Theoretical calculations show that a new mechanism, which is the molecular analogue of the interactions between magnetic ions in metals, is responsible for the magnetic states. Our combination of theory and experiments opens the field of organic thin film magnetic engineering.
description: PDF, 14 pages, 3 figures, 1 table
Atomic calculations and search for variation of the fine structure constant in quasar absorption spectra
Creators: name: Dzuba, V. A.
name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A brief review of the search for variation of the fine structure constant in quasar absorption spectra is presented. Special consideration is given to the role of atomic calculations in the analysis of the observed data. A range of methods which allow to perform calculations for atoms or ions with different electron structure and which cover practically all periodic table of elements is discussed. Critical compilation of the results of the calculations as well as a review of the most recent results of the analysis are presented.
description: 9 pages, 2 figures. Based on the talk at the Symposium on Atomic Physics: A Tribute to Walter Johnson, Notre Dame, 5 April 2008. Reference 26 is corrected
The Combined NVSS-FIRST Galaxies (CoNFIG) Sample - I. Sample Definition, Classification and Evolution
Creators: name: Gendre, M. A.
name: Wall, J. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The CoNFIG (Combined NVSS-FIRST Galaxies) sample is a new sample of 274 bright radio sources at 1.4 GHz. It was defined by selecting all sources with S_1.4GHz > 1.3 Jy from the NRAO-VLA Sky Survey (NVSS) in the North field of the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. New radio observations obtained with the VLA for 31 of the sources are presented. The sample has complete FRI/FRII morphology identification; optical identifications and redshifts are available for 80% and 89% of the sample respectively, yielding a mean redshift of ~0.71. One of the goals of this survey is to get better definitions of luminosity distributions and source counts of FRI/FRII sources separately, in order to determine the evolution of the luminosity function for each type of source. We present a preliminary analysis, showing that these data are an important step towards examining various evolutionary schemes for these objects and to confirm or correct the dual population unified scheme for radio AGN. Improving our understanding of radio galaxy evolution will give better insight into the role of AGN feedback in galaxy formation.
description: Accepted for publication in MNRAS
Search for variation of the fundamental constants in atomic, molecular and nuclear spectra
Creators: name: Flambaum, V. V.
name: Dzuba, V. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The search for variation of the fundamental constants such as the fine structure constant $α$ ($α=e^2/\hbar c$) and the ratios of fundamental masses (e.g., electron to proton mass ratio $μ=m_e/m_p$) is reviewed. Strong emphasis is given to establishing the relationships between the change in the measured frequencies of atomic, molecular or nuclear transitions and the corresponding change of the fundamental constants. Transitions in which the sensitivity of the frequency change to the variation of the fine structure constant is strongly enhanced are discussed and most recent experimental results are presented. Most attention is given to the use of atomic, molecular and nuclear transitions in the study of quasar absorption spectra and in atomic clock experiments.
description: 9 pages. Based on the talk at the Symposium on Atomic Physics: A Tribute to Walter Johnson, Notre Dame, 4 April 2008. Cited numbers corrected
Distance-based clustering of sparsely observed stochastic processes, with applications to online auctions
Creators: name: Peng, Jie
name: Müller, Hans-Georg
Publisher: name: arXiv
Year: 2008
Subjects: subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We propose a distance between two realizations of a random process where for each realization only sparse and irregularly spaced measurements with additional measurement errors are available. Such data occur commonly in longitudinal studies and online trading data. A distance measure then makes it possible to apply distance-based analysis such as classification, clustering and multidimensional scaling for irregularly sampled longitudinal data. Once a suitable distance measure for sparsely sampled longitudinal trajectories has been found, we apply distance-based clustering methods to eBay online auction data. We identify six distinct clusters of bidding patterns. Each of these bidding patterns is found to be associated with a specific chance to obtain the auctioned item at a reasonable price.
description: Published in at http://dx.doi.org/10.1214/08-AOAS172 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Phycitinae
Creators: name: Pohl, Greg
name: Anweiler, Gary
name: Schmidt, Christian
name: Kondla, Norbert
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Pyralidae
Phycitinae

description: Anerastiini 929 R Ragonotia dotalis (Hulst, 1886) Apr – May – – G T: Shaffer (1968) L: Bowman (1951) C: Unknown 930 R Anerastia lotella (Hübner, 1813) Jun – Jul – b G T: Shaffer (1968) L: Bowman (1951), Shaffer (1968) C: CNC, NFRC, OLDS, UASM 931 R Coenochroa californiella Ragonot, 1887 Jun – – G T: Shaffer (1968) L: Bowman (1951) C: UASM 932 * R Coenochroa illibella (Hulst, 1887) Jul – – G T: Shaffer (1968) L: Shaffer (1968) C: CNC, UASM
description: Published as part of Pohl, Greg, Anweiler, Gary, Schmidt, Christian & Kondla, Norbert, 2010, An annotated list of the Lepidoptera of Alberta, Canada, pp. 1-549 in ZooKeys 38 (38) on page 149, DOI: 10.3897/zookeys.38.383, http://zenodo.org/record/576629
description: {"references": ["Shaffer JC (1968) A revision of the Peoriinae and Anerastiinae (auctorum) of America north of Mexico (Lepidoptera: Pyralidae). Bulletin of the United States National Museum 280: 1 - 124.", "Bowman K (1951) An annotated list of the Lepidoptera of Alberta. Canadian Journal of Zoology 29: 121 - 165."]}
An approach to the organization of taxonomies
Creators: name: Bishop, Graig David
Publisher: name: University of British Columbia
Year: 2010

description: The ISA hierarchy used by present day inferential database systems is deficient in that it does not represent a variety of domain relationships (type relationships). Such hierarchies associate explicitly defined sets with the leaves of a tree. Non-leaf nodes in the tree inherit members from their child nodes. In keeping with the use of sets, this paper gives motivation for having type relationships other than subset. Included are union, intersection and a disjointness condition. A formalism for the typed database (TDB) is given, using the monadic first order predicate calculus as its theoretical basis. Non-unit formulae represent intensional (general) information about the world being represented and unit ground clauses represent extensional (specific) information. Predicates represent types, and constant symbols represent set members. This is connected to the set concept via predicate extensions. The extension is that set of constant symbols which are provable as arguments to the given predicate. Given the so-called concreteness condition and consistency of the TDB, the desired set theoretic relationships (union, intersection and disjointness) of predicate extensions follow. This strengthens the link between the formalism of the predicate calculus and the more natural set representation. A canonical form of a TDB is shown that admits an appropriate machine representation. Using this is can be determined if a constant symbol as an argument to a given predicate is provable (domain membership) in constant time. An update algorithm is developed and is shown to be correct in that it maintains concreteness and consistency. Thus the TDB is shown to be a practical generalization of the ISA hierarchy but is considerably more expressive.
A convex hull algorithm optimal for point sets in even dimensions
Creators: name: Seidel, Raimund
Publisher: name: University of British Columbia
Year: 2010

description: Finding the convex hull of a finite set of points is important not only for practical applications but also for theoretical reasons: a number of geometrical problems, such as constructing Voronoi diagrams or intersecting hyperspheres, can be reduced to the convex hull problem, and a fast convex hull algorithm yields fast algorithms for these other problems. This thesis deals with the problem of constructing the convex hull of a finite point set in R . Mathematical properties of convex hulls are developed, in particular, their facial structure, their representation, bounds on the number of faces, and the concept of duality. The main result of this thesis is an O(nlogn + n[(d+1)/2]) algorithm for the construction of the convex hull of n points in Rd. It is shown that this algorithm is worst case optimal for even d≥2.
Boolean Matrix Factorization via Nonnegative Auxiliary Optimization
Creators: name: Truong, Duc P.
name: Skau, Erik
name: Desantis, Derek
name: Alexandrov, Boian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: A novel approach to Boolean matrix factorization (BMF) is presented. Instead of solving the BMF problem directly, this approach solves a nonnegative optimization problem with the constraint over an auxiliary matrix whose Boolean structure is identical to the initial Boolean data. Then the solution of the nonnegative auxiliary optimization problem is thresholded to provide a solution for the BMF problem. We provide the proofs for the equivalencies of the two solution spaces under the existence of an exact solution. Moreover, the nonincreasing property of the algorithm is also proven. Experiments on synthetic and real datasets are conducted to show the effectiveness and complexity of the algorithm compared to other current methods.
Study of Integrated Spectra of Four Globular Clusters in M31
Creators: name: Maricheva, M. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The results of determining the metallicity, age, helium mass fraction (Y) and abundances of the elements C, N, Mg, Ca, Mn, Ti and Cr by moderate resolution spectra for four globular clusters in the galaxy M 31: Bol 6, Bol 20, Bol 45 and Bol 50 are presented. The chemical composition for Bol 20 and Bol 50, and Y for four clusters are determined for the first time. The spectra of the studied objects were obtained with the 6-meter telescope of the SAO RAS in 2020. All the clusters under study turned out to be older than 11 Gyrs. The determined metallicities [Fe/H] are in the range from -1.1 to -0.75 dex. They are lower than the metallicity of stars of the M 31 halo at a given distance from the galactic center (R_M31 < 10 kpc). The abundances of the elements of the alpha-process [alpha/Fe] = ([O/Fe] + [Mg/Fe] + [Ca/Fe])/3 of the four clusters correspond to those of the stars of the inner halo of M31.
description: 21 pages, 15 figures, 6 tables accepted to Astrophysical Bulletin
Peoriini
Creators: name: Pohl, Greg
name: Anweiler, Gary
name: Schmidt, Christian
name: Kondla, Norbert
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Pyralidae

description: Peoriini 933 R Peoria approximella (Walker, 1866) L Jun – E Aug – – G T: Shaffer (1968) L: Bowman (1951), Shaffer (1968) C: CNC, NFRC, OLDS
description: Published as part of Pohl, Greg, Anweiler, Gary, Schmidt, Christian & Kondla, Norbert, 2010, An annotated list of the Lepidoptera of Alberta, Canada, pp. 1-549 in ZooKeys 38 (38) on page 149, DOI: 10.3897/zookeys.38.383, http://zenodo.org/record/576629
description: {"references": ["Shaffer JC (1968) A revision of the Peoriinae and Anerastiinae (auctorum) of America north of Mexico (Lepidoptera: Pyralidae). Bulletin of the United States National Museum 280: 1 - 124.", "Bowman K (1951) An annotated list of the Lepidoptera of Alberta. Canadian Journal of Zoology 29: 121 - 165."]}
Entwicklung eines Zeitschriften-Recherchetools für das Open-Access-Publizieren im Rahmen von open-access.network
Creators: name: Schönfelder, Nina
name: Kohorst, Petra
Publisher: name: Kolloquium Wissensinfrastruktur
Year: 2021

description: Der Fokus des BMBF-geförderten Verbundprojekts "open-access.network" liegt auf der Bereitstellung von unterschiedlichen Informations-, Fortbildungs- und Vernetzungsformaten. Dabei ist "open-access.network" nicht nur der Name des Verbundprojekts, sonder auch die Domain der neuen Informationsplattform. Das Bielefelder Arbeitspaket "Datenbanken" umfasst dabei die Entwicklung eines Zeitschriften-Recherchetools für das Open-Access-Publizieren, das ein Service der Informationsplattform werden wird. Es soll Wissenschafter*innen dabei unterstützen das für ihren Artikel optimale Publikationsorgan - unter Berücksichtigung von Open-Access-Publikationskosten - zu finden. Im Kolloquium werden die Datengrundlage, die technische Implementierung sowie der Entwicklungsstand vorgestellt.
description: Kolloquium Wissensinfrastruktur, Wintersemester 2021/22
Viscous Cosmology and Thermodynamics of Apparent Horizon
Creators: name: Akbar, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown that the differential form of Friedmann equations of FRW universe can be recast as a similar form of the first law, $T_{h}dS_{h} = dE + WdV$, of thermodynamics at the apparent horizon of FRW universe filled with the viscous fluid. It is also shown that the generalized second law of thermodynamics holds at the apparent horizon of FRW universe and preserves dominant energy condition.
description: 8 pages
Improving performance by strategy-independent program restructuring using bounded locality intervals
Creators: name: Law, Bernard Ming-Ki
Publisher: name: University of British Columbia
Year: 2010

description: An efficient strategy-independent program restructuring algorithm based on the empirical studies of phases and transitions in the symbolic reference strings of real programs is developed. The algorithm is formulated on the basis that the majority of the page faults occur during phase transitions. Thus emphasis is placed in grouping those relocatable blocks referenced during phase transitions in the same pages. Some parameters to characterize program behavior are also established. The purpose is to study the relationship between these parameters and the performance of the program. An experiment to compare the performance improvement of the proposed restructuring algorithm and other major existing algorithms is conducted. The performance indices chosen are the mean working set size and the page fault rate. The problem of data dependency, the cost as well as the portability of program restructuring procedures are discussed.
Topological Hall effect in the antiferromagnetic Dirac semimetal EuAgAs
Creators: name: Laha, Antu
name: Singha, Ratnadwip
name: Mardanya, Sougata
name: Singh, Bahadur
name: Agarwal, Amit
name: Mandal, Prabhat
name: Hossain, Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The non-trivial magnetic texture in real space gives rise to the intriguing phenomenon of topological Hall effect (THE), which is relatively less explored in topological semimetals. Here, we report large THE in the antiferromagnetic (AFM) state in single crystals of EuAgAs, an AFM Dirac semimetal. EuAgAs hosts AFM ground state below $T_N$ = 12 K with a weak ferromagnetic component. The in-plane isothermal magnetization below $T_N$ exhibits a weak metamagnetic transition. We also observe chiral anomaly induced positive longitudinal magnetoconductivity which indicates a Weyl fermion state under applied magnetic field. The first-principles calculations reveal that EuAgAs is an AFM Dirac semimetal with a pair of Dirac cones, and therefore, a Weyl semimetailic state can be realized under time-reversal symmetry breaking via an applied magnetic field. Our study establishes that EuAgAs is a novel system for exploiting the interplay of band topology and the topology of the magnetic texture.
description: Accepted for publication in Phys. Rev. B as a Letter
FOOD VISION-A SMART RECIPE ASSISTANT
Creators: name: R, Nivetha
Publisher: name: Zenodo
Year: 2025
Subjects: AI
NLP
CNN

description: Food Vision is an AI-powered smart recipe assistant designed to enhance cooking experiences through image recognition and personalized recommendations. Using deep learning algorithms, the system can identify food ingredients from images and suggest recipes based on available items. It also considers user preferences, dietary restrictions, and nutritional needs to generate customized meal plans. This paper explores the implementation of Food Vision, its underlying technologies, and its potential to revolutionize meal planning and cooking efficiency.
Integrable Spin Chain of Superconformal U(M)xU(N) Chern-Simons Theory
Creators: name: Bak, Dongsu
name: Gang, Dongmin
name: Rey, Soo-Jong
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: N=6 superconformal Chern-Simons theory with gauge group U(M)xU(N)} is dual to N M2-branes and (M-N) fractional M2-branes, equivalently, discrete 3-form holonomy at C4/Zk orbifold singularity. We show that, much like its regular counterpart of M=N, the theory at planar limit have integrability structure in the conformal dimension spectrum of single trace operators. We first revisit the Yang-Baxter equation for a spin chain system associated with the single trace operators. We show that the integrability by itself does not preclude parity symmetry breaking. We construct two-parameter family of parity non-invariant, alternating spin chain Hamiltonian involving three-site interactions between 4 and 4* of SU(4). At weak `t Hooft coupling, we study the Chern-Simons theory perturbatively and calculate anomalous dimension of single trace operators up to two loops. The computation is essentially parallel to the regular case M=N. We find that resulting spin chain Hamiltonian matches with the Hamiltonian derived from Yang-Baxter equation, but to the one preserving parity symmetry. We give several intuitive explanations why the parity symmetry breaking is not detected in the Chern-Simons spin chain Hamiltonian at perturbative level. We suggest that open spin chain, associated with open string excitations on giant gravitons or dibaryons, can detect discrete flat holonomy and hence parity symmetry breaking through boundary field.
description: 1+21 pages; v2. discussions expanded; v3. references and typos corrected; v4. minor changes