cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Production of multi-strange baryons in 7 TeV proton-proton collisions with ALICE
Creators: name: Maire, Antonin
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the perspective of comparisons between proton-proton and heavy-ion physics, understanding the production mechanisms (soft and hard) in pp that lead to strange particles is of importance. Measurements of charged multi-strange (anti-)baryons (Omega and Xi) are presented for pp collisions at sqrt(s) = 7 TeV. This report is based on results obtained by ALICE (A Large Ion Collider Experiment) from the 2010 data-taking. Taking advantage of the characteristic cascade-decay topology, the identification of Xi-, anti-Xi+, Omega- and anti-Omega+ can be performed, over a wide range of momenta (e.g. from 0.6 to 8.5 GeV/c for Xi-, with the present statistics analysed). The production at central rapidity (|y| < 0.5) as a function of transverse momentum, dN/dptdy, is presented. These results are compared to PYTHIA Perugia 2011 predictions.
description: 6 pages, 3 figures, 1 table. Strangeness In Quark Matter (SQM 2011), 18-24 Sept. 2011, Krakow. To be published in Acta Physica Polonica B (APPB)
QED Reloaded: Towards a Pluralistic Formal Library of Mathematical Knowledge
Creators: name: Kohlhase, Michael
name: Rabe, Florian
Publisher: name: Alma Mater Studiorum - University of Bologna
Year: 2016
Subjects: QED; library integration; mathematical knoweldge management

description: Proposed in 1994, the ``QED project'' was one of the seminally influential initiatives in automated reasoning: It envisioned the formalization of ``all of mathematics'' and the assembly of these formalizations in a single coherent database. Even though it never led to the concrete system, communal resource, or even joint research envisioned in the QED manifesto, the idea lives on and shapes the research agendas of a significant part of the community

This paper surveys a decade of work on representation languages and knowledge management tools for mathematical knowledge conducted in the KWARC research group at Jacobs University Bremen.
It assembles the various research strands into a coherent agenda for realizing the QED dream with modern insights and technologies.
description: Journal of Formalized Reasoning, Vol 9, No 1 (2016): Special Issue: Twenty Years of the QED Manifesto.
Asymptotic analysis for the strip problem related to a parabolic third - order operator
Creators: name: De Angelis, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82D55-35K31- 35B40

description: Aim of this paper is the qualitative analysis of a boundary value problem for a third order non linear parabolic equation which describes several dissipative models. When the source term is linear, the problem is explictly solved by means of a Fourier series with properties of rapid convergence. In the non linear case, appropriate estimates of this series allow to deduce the asymptotic behaviour of the solution.
Language contact between migrating Bantu speakers and resident Khoisan speakers in southern Africa"
Creators: name: Gunnink, Hilde
Publisher: name: Zenodo
Year: 2021
Subjects: Bantu
Khoisan
Africa
Language contact
Historical linguistics

description: On May 12, 2021, BantUGent and the Research Institute for Languages and Cultures of Asia and Africa (ILCAA) in Tokyo (Japan) have the first kick-off meeting of their FWO-JSPS-funded collaborative project on “The Past and Present of Bantu Languages: Integrating Micro-Typology, Historical-Comparative Linguistics and Lexicography“. It also covers BantuFirst research. 9:30-9:40: Opening remarks 9:45-11:15: The first session 9:45-10:15 Sara Pacchiarotti: “Phylogenetics and the Comparative Method as tools for the internal classification of West-Coastal Bantu: results and challenges” 10:15-10:45 Lorenzo Maselli: “Phonetic and phonological research on hunter-gatherer substrate interference in the West-Coastal Bantu homeland region: some preliminary results and methodological remarks” 10:45-11:15 Kyoungwon Jeong: “Micro-parametric research on cross-Bantu phonological microvariation: a test case in Swati” 11:15-11:30 Coffee 11:30-13:00: The second session 11:30-12:00 Yuka Makino: “Contrastive analysis on the local variation of TAM expressions in M40 and M50″ 12:00-12:30 Makoto Furumoto: “A synchronic and diachronic analysis of the Kimakunduchi final vowel” 12:30-13:00 Hilde Gunnink: “Language contact between migrating Bantu speakers and resident Khoisan speakers in southern Africa”
The septal control of hippocampal field activity in the freely moving rat: an investigation using local anaesthetic and cholinergic agents
Creators: name: Lawson, Victoria Heather
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: QP 383.25 L38 1992
subject: Theta rhythm
subject: Hippocampus (Brain)

description: Bibliography: p. 185-222.
Molecular biology of c-type cytochromes from the sulfate-reducing bacterium Desulfovibrio vulgaris Hildenborough
Creators: name: Pollock, W. Brent R.
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: QP 671 C8 P65 1992
subject: Cytochrome c
subject: Peptides
subject: Hemes
subject: Proteins

description: Bibliography: p. 171-179.
Distinct oxygen hole doping in different layers of $\rm Sr_{2}CuO_{4-δ}-La_{2}CuO_4$ superlattices
Creators: name: Smadici, S.
name: Lee, J. C. T.
name: Abbamonte, P.
name: Rusydi, A.
name: Logvenov, G.
name: Bozovic, I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: X-ray absorption in $\rm Sr_{2}CuO_{4-δ}-La_{2}CuO_4$ (SCO-LCO) superlattices shows a variable occupation with doping of a hole state different from holes doped for $x \lesssim x_{optimal}$ in bulk $\rm La_{2-x}Sr_{x}CuO_4$ and suggests that this hole state is on apical oxygen atoms and polarized in the $a-b$ plane. Considering the surface reflectivity gives a good qualitative description of the line shapes of resonant soft X-ray scattering. The interference between superlattice and surface reflections was used to distinguish between scatterers in the SCO and the LCO layers, with the two hole states maximized in different layers of the superlattice.
Spatial and Temporal Variations of the Diffuse Iron 6.4 keV Line in the Galactic Center Region
Creators: name: Chernyshov, D. O.
name: Dogiel, V. A.
name: Nobukawa, M.
name: Tsuru, T. G.
name: Koyama, K.
name: Uchiyama, H.
name: Matsumoto, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the diffuse Fe I K-alpha line generated in the diffuse interstellar molecular hydrogen by primary photons or subrelativistic protons injected by Sagittarius (Sgr) A*. We showed that unlike emission from compact molecular clouds, this emission can be permanently observed in the directions of the Galactic center. We conclude that the diffuse emission of 6.4 keV line observed at present is probably due to Fe I K-alpha vacancy production by primary photons if the X-ray luminosity of Sgr A* was about Lx ~ 10^39-10^40 erg/s. In principle these data can also be described in the framework of the model when the 6.4 keV line emission is generated by subrelativistic protons generated by accretion onto the central black hole but in this case extreme parameters of this model are necessary.
description: 15 pages, 7 figues. Accepted for publication in PASJ
Data for the ICAPS 2017 paper "Tailoring Pattern Databases for Unsolvable Planning Instances"
Creators: name: Ståhlberg, Simon
Publisher: name: Zenodo
Year: 2022
Subjects: classical planning, automated planning, variable projection, abstraction

description: Variable projection data for unsolvable instances over multiple domains. The data consists of three files per instance with the file endings: .sas: The SAS+ ground representation of the instance, produced by the translator by Fast-Downward. .sqlite: The actual variable projection data, stored in a SQLite database (a SQLite viewer can be used to display the relational structure). It contains whether each projection is solvable together with the total number of states, how many are dead-end states, the distance to the closest goal state from the initial state, and the average such distance from non dead-end states. The data for an instance might be incomplete as it is computationally infeasible to enumerate and solve all possible variable projections. .status: This file was used during the creation of the data and can be ignored. The files first.tar.gz and second.tar.gz contain half of the instances each from the same domains.
Graphene on Rh(111): STM and AFM studies
Creators: name: Voloshina, E. N.
name: Dedkov, Yu. S.
name: Torbruegge, S.
name: Thissen, A.
name: Fonin, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electronic and crystallographic structure of the graphene/Rh(111) moiré lattice is studied via combination of density-functional theory calculations and scanning tunneling and atomic force microscopy (STM and AFM). Whereas the principal contrast between hills and valleys observed in STM does not depend on the sign of applied bias voltage, the contrast in atomically resolved AFM images strongly depends on the frequency shift of the oscillating AFM tip. The obtained results demonstrate the perspectives of application atomic force microscopy/spectroscopy for the probing of the chemical contrast at the surface.
description: manuscript and supplementary information; submitted to Appl. Phys. Lett. on 01.03.2011
Time-resolved diamond magnetic microscopy of superparamagnetic iron-oxide nanoparticles
Creators: name: Richards, B. A.
name: Ristoff, N.
name: Smits, J.
name: Perez, A. Jeronimo
name: Fescenko, I.
name: Aiello, M. D.
name: Hubert, F.
name: Silani, Y.
name: Mosavian, N.
name: Ziabari, M. Saleh
name: Berzins, A.
name: Damron, J. T.
name: Kehayias, P.
name: Egbebunmi, D.
name: Shield, J. E.
name: Huber, D. L.
name: Mounce, A. M.
name: Lilly, M. P.
name: Karaulanov, T.
name: Jarmola, A.
name: Laraoui, A.
name: Acosta, V. M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Medical Physics (physics.med-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Superparamagnetic iron-oxide nanoparticles (SPIONs) are promising probes for biomedical imaging, but the heterogeneity of their magnetic properties is difficult to characterize with existing methods. Here, we perform widefield imaging of the stray magnetic fields produced by hundreds of isolated ~30-nm SPIONs using a magnetic microscope based on nitrogen-vacancy centers in diamond. By analyzing the SPION magnetic field patterns as a function of applied magnetic field, we observe substantial field-dependent transverse magnetization components that are typically obscured with ensemble characterization methods. We find negligible hysteresis in each of the three magnetization components for nearly all SPIONs in our sample. Most SPIONs exhibit a sharp Langevin saturation curve, enumerated by a characteristic polarizing applied field, B_c. The B_c distribution is highly asymmetric, with a standard deviation (1.4 mT) that is larger than the median (0.6 mT). Using time-resolved magnetic microscopy, we directly record SPION Néel relaxation, after switching off a 31 mT applied field, with a temporal resolution of ~60 ms that is limited by the ring-down time of the electromagnet coils. For small bias fields B_{hold}=1.5-3.5 mT, we observe a broad range of SPION Néel relaxation times--from milliseconds to seconds--that are consistent with an exponential dependence on B_{hold}. Our time-resolved diamond magnetic microscopy study reveals rich SPION sample heterogeneity and may be extended to other fundamental studies of nanomagnetism.
description: Main text: 9 pages, 5 figures. Entire manuscript including Appendices: 31 pages, 24 figures
One parameter family of indecomposable optimal entanglement witnesses arising from generalized Choi maps
Creators: name: Ha, Kil-Chan
name: Kye, Seung-Hyeok
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81P40, 15B48, 46L60, 81P15

description: In the recent paper [Chruściński and Wudarski, arXiv:1105.4821], it was conjectured that the entanglement witnesses arising from some generalized Choi maps are optimal. We show that this conjecture is true. Furthermore, we show that they provide a one parameter family of indecomposable optimal entanglement witnesses.
description: 3 pages
Life satisfaction of chinese elderly immigrants: an exploratory study in Calgary
Creators: name: Lai, Wing-Leung
Publisher: name: Social Work
Year: 1992
Subjects: subject: FC 3700 C5 L35 1992
subject: Women immigrants - Alberta - Calgary
subject: Chinese - Alberta - Calgary
subject: Quality of life
subject: Aged - Alberta - Calgary

description: Bibliography: p. 126-139.
Morphology, fractographic analysis and their relationships with the mechanical properties of high temperature aged AISI 316 stainless steel
Creators: name: Zhao, Wuyi
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: TA 479 S77 Z43 1992
subject: Steel, Stainless - Thermal properties
subject: Steel, Stainless - Fracture
subject: Steel, Stainless - Testing
subject: Fractography
subject: Metals at high temperatures

description: Bibliography: p. 142-149.
Efficient single-photon-assisted entanglement concentration for partially entangled photon pairs
Creators: name: Sheng, Yu-Bo
name: Zhou, Lan
name: Zhao, Sheng-Mei
name: Zheng, Bao-Yu
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present two realistic entanglement concentration protocols (ECPs) for pure partially entangled photons. A partially entangled photon pair can be concentrated to a maximally entangled pair with only an ancillary single photon in a certain probability, while the conventional ones require two copies of partially entangled pairs at least. Our first protocol is implemented with linear optics and the second one is implemented with cross-Kerr nonlinearities. Compared with other ECPs, they do not need to know the accurate coefficients of the initial state. With linear optics, it is feasible with current experiment. With cross-Kerr nonlinearities, it does not require the sophisticated single-photon detectors and can be repeated to get a higher success probability. Moreover, the second protocol can get the higher entanglement transformation efficiency and it maybe the most economical one by far. Meanwhile, both of protocols are more suitable for multi-photon system concentration, because they need less operations and classical communications. All these advantages make two protocols be useful in current long-distance quantum communications.
Mechanics of cables with interwire friction
Creators: name: Huang, Xiaolun
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: TA 660 C3 H83 1992
subject: Cables - Testing
subject: Hysteresis
subject: Internal friction

description: Bibliography: p. 229-236.
description: This thesis deals with the problem of various mechanical behaviours of cables when interwire dry friction is taken into account. Literature review shows that damping properties of cables due to interwire slippage have been known for a long time. However, most existing theories in cable mechanics neglect the effect of interwire friction and corresponding slippage between the wires and thus are not capable of analyzing the hysteresis in cables. A mathematical mode is developed in which a cable is considered as a system of interacting thin wires with dry friction at the interfaces. Accordingly, a cable behaves as a solid rod before the onset of slip, and as a system of wires, governed by the Love's theory of thin rods, after the slip takes place. Various modes of cable deformations are considered: simple and cyclic extension, uniform and cyclic uniform bending. The origination and propagation of an interwire slip is the special area of interest in this study, since it has not been done before. The slip is a manifestation of internal degrees of freedom in a cable. It is shown that friction losses are caused by the twisting and bending deformations of the wire in an axially loaded cable. The propagation of slippage is found to be a linear function of load. Explicit expressions for the hysteretic losses in a tension cable are derived, which show that they are proportional to the third power of the oscillating load and in inverse proportion to the friction forces. In the case of cyclic deformations, analytical relationships are derived for the loading, unloading and reloading phases of the first cycle. It is shown that the unloading and reloading phases result in a closed hysteretic loop. In the case of bending, a slip is expected to start at the neutral axis of cross section of the cable and it will spread symmetrically toward the outer and inner part of the cable with the increase of bending. Also the critical bending curvature for the onset of slippage, slippage boundary and energy dissipation are derived Bending stiffness of the cable with finite friction is analyzed as well. Numerical examples are given to show the applications of the model. Comparison of the theoretical results with the known experimental data is very encouraging.
Photoevaporation as a Truncation Mechanism for Circumplanetary Disks
Creators: name: Mitchell, Tyler R.
name: Stewart, Glen R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate the conditions under which the regular satellites of Jupiter and Saturn formed. The final stage of giant planet accretion is thought to occur slowly over a relatively long, 10 Myr, timescale. Gas accretion during this stage, through a completely or partially opened gap in the solar nebula, occurs slowly allowing for the condensation of ices, and incomplete differentiation, seen in the regular satellites of the giant planets. Furthermore, the dichotomy seen in the Jovian and Saturnian systems may be explained as this infall wanes or is completely shutoff as a result of gap opening or global depletion of gas in the solar nebula. We present one-dimensional simulations of circumplanetary disks that couple the viscous transport of material with the loss of mass at the disk outer edge by ultraviolet photoevaporation as well as the infall of material from the solar nebula. We find that the circumplanetary disks of these protoplanets are truncated, as a result of photoevaporation, at a range of values with the mean corresponding to $\approx$ 0.16 Hill radii. These truncation radii are broadly consistent with the current locations of the regular satellite systems of Jupiter and Saturn. We also find that photoevaporation can successfully act as a clearing mechanism for circumplanetary nebulae on the potentially short timescales, 100-10,000 yr, over which mass accretion from the solar nebula wanes as a result of gap opening. Such a rapid clearing of the circum-Jovian disk may be required to explain the survival of the Galilean satellites.
description: 6 pages, 6 figures, accepted for publication in the Astronomical Journal
Crystal to liquid cross-over in the active Calogero-Moser model
Creators: name: Santra, Saikat
name: Touzo, Leo
name: Dasgupta, Chandan
name: Dhar, Abhishek
name: Dutta, Suman
name: Kundu, Anupam
name: Doussal, Pierre Le
name: Schehr, Gregory
name: Singh, Prashant
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider a one-dimensional system comprising of $N$ run-and-tumble particles confined in a harmonic trap interacting via a repulsive inverse-square power-law interaction. This is the ``active" version of the Calogero-Moser system where the particles are associated with telegraphic noise with two possible states $\pm v_0$. We numerically compute the global density profile in the steady state which shows interesting crossovers between three different regimes: as the activity increases, we observe a change from a density with sharp peaks characteristic of a crystal region to a smooth bell-shaped density profile, passing through the intermediate stage of a smooth Wigner semi-circle characteristic of a liquid phase. We also investigate analytically the crossover between the crystal and the liquid regions by computing the covariance of the positions of these particles in the steady state in the weak noise limit. It is achieved by using the method introduced in Touzo {\it et al.} [Phys. Rev. E {\bf 109}, 014136 (2024)] to study the active Dyson Brownian motion. Our analytical results are corroborated by thorough numerical simulations.
Conservative self-organized extremal model for wealth distribution
Creators: name: Chakraborty, Abhijit
name: Mukherjee, G.
name: Manna, S. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Finance (q-fin.GN)
subject: FOS: Economics and business

description: We present a detailed numerical analysis of the modified version of a conservative self-organized extremal model introduced by Pianegonda et. al. for the distribution of wealth of the people in a society. Here the trading process has been modified by the stochastic bipartite trading rule. More specifically in a trade one of the agents is necessarily the one with the globally minimal value of wealth, the other one being selected randomly from the neighbors of the first agent. The pair of agents then randomly re-shuffle their entire amount of wealth without saving. This model has most of the characteristics similar to the self-organized critical Bak-Sneppen model of evolutionary dynamics. Numerical estimates of a number of critical exponents indicate this model is likely to belong to a new universality class different from the well known models in the literature. In addition the persistence time, which is the time interval between two successive updates of wealth of an agent has been observed to have a non-trivial power law distribution. An opposite version of the model has also been studied where the agent with maximal wealth is selected instead of the one with minimal wealth, which however, exhibits similar behavior as the Minimal Wealth model.
description: 11 pages, 16 figures
D2.3 Set of FAIR data repositories features
Creators: name: Behnke, Claudia
name: Bonino, Luiz
name: Coen, Gerard
name: Le Franc, Yann
name: Parland-von Essen, Jessica
name: Riungu-Kalliosaari, Leah
name: Staiger, Christine
Publisher: name: Zenodo
Year: 2020
Subjects: FAIR principlines
Repositories
digital research infrastuctures
semantic interoperability
data
metadata
research data management

description: This report presents the results of the first year of Task 2.3 from the FAIRsFAIR project. It gives guidelines to enable features for repositories which allow them not only to host FAIR digital objects, but also to be FAIR themselves. The recommendations were collected in the workshop “Building the data landscape of the future: FAIR Semantics and FAIR Repositories” (22 October 2019, Espoo Finland) that was hosted by this task together with the FAIRsFAIR task 2.2. It derived input from more than 70 participants from 6 communities: the European Life Sciences Infrastructure for Biological Information (ELIXIR), the European Incoherent Scatter Scientific Association (EISCAT), the Social Sciences and Humanities (SSH), the Integrated Carbon Observation System (ICOS), the European network of Long-Term Ecosystem Research sites (eLTER), and the Data Publisher for Earth & Environmental Science ( Pangea). The background of participants lied in infrastructures, research and libraries.
The Hilbert basis method for D-flat directions and the superpotential
Creators: name: Kappl, Rolf
name: Ratz, Michael
name: Staudt, Christian
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss, using the Hilbert basis method, how to efficiently construct a complete basis for D-flat directions in supersymmetric Abelian and non-Abelian gauge theories. We extend the method to discrete (R and non-R) symmetries. This facilitates the construction of a basis of all superpotential terms in a theory with given symmetries.
description: 11 pages; a related mathematica code can be found at http://einrichtungen.ph.tum.de/T30e/codes/NonAbelianHilbert/
Josephson Effect in Noncentrosymmetric Superconductor Junctions
Creators: name: Asano, Yasuhiro
name: Yamano, Satoshi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We discuss the Josephson current between two noncentrosymmetric superconductors. The coexistence of superconducting order parameters between spin-singlet $Δ_{\text{S}}$ and helical p-wave spin-triplet $Δ_{\text{T}}$ enriches a variety of low-temperature behavior of Josephson current depending on their relative amplitudes. We will show that characteristic behaviors of the Josephson current for $Δ_{\text{S}} > Δ_{\text{T}}$ are clearly different from those for $Δ_{\text{S}} < Δ_{\text{T}}$. The topologically protected zero-energy surface bound states are responsible for the clear difference. We conclude that the Josephson current well reflects character of the topological surface states and the pairing symmetry of noncentrosymmetric superconductors.
description: 7 pages, 6 figures embedded
Pulp mills, publics and communications: a case study of Daishowa Canada Co. Ltd.
Creators: name: Kitamura, Yoshiko
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: TD 195 P37 K57 1992
subject: Pulp mills - Alberta - Peace River
subject: Wood pulp industry - Alberta - Peace River - Environmental aspects
subject: Daishowa Canada Co. Ltd.
subject: Communication - Social Aspects - Alberta - Peace River

description: Bibliography: p. 155-162.
What are Published X-ray lightcurves telling us about Young Supernova Expansion?
Creators: name: Dwarkadas, Vikram V.
name: Gruszko, Julieta
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Massive stars lose mass in the form of stellar winds and outbursts. This material accumulates around the star. When the star explodes as a supernova (SN) the resulting shock wave expands within this circumstellar medium. The X-ray emission resulting from the interaction depends, among other parameters, on the density of this medium, and therefore the variation in the X-ray luminosity can be used to study the variation in the density structure of the medium. In this paper we explore the X-ray emission and lightcurves of all known SNe, in order to study the nature of the medium into which they are expanding. In particular we wish to investigate whether young SNe are expanding into a steady wind medium, as is most often assumed in the literature. We find that in the context of the theoretical arguments that have been generally used in the literature, many young SNe, and especially those of Type IIn, which are the brightest X-ray luminosity class, do not appear to be expanding into steady winds. Some IIns appear to have very steep X-ray luminosity declines, indicating density declines much steeper than r$^{-2}$. However, other IIns show a constant or even increasing X-ray luminosity over periods of months to years. Many other SNe do not appear to have declines consistent with expansion in a steady wind. SNe with lower X-ray luminosities appear to be more consistent with steady wind expansion, although the numbers are not large enough to make firm statistical comments. The numbers do indicate that the expansion and density structure of the circumstellar medium must be investigated before assumptions can be made of steady wind expansion. Unless a steady wind can be shown, mass-loss rates deduced using this assumption may need to be revised.
description: 12 pages, 3 color Figures. Accepted to MNRAS
Evidence for Dirac Fermions in a honeycomb lattice based on silicon
Creators: name: Chen, Lan
name: Liu, Cheng-Cheng
name: Feng, Baojie
name: He, Xiaoyue
name: Cheng, Peng
name: Ding, Zijing
name: Meng, Sheng
name: Yao, Yugui
name: Wu, Kehui
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Silicene, a sheet of silicon atoms in a honeycomb lattice, was proposed to be a new Dirac-type electron system similar as graphene. We performed scanning tunneling microscopy and spectroscopy studies on the atomic and electronic properties of silicene on Ag(111). An unexpected $\sqrt{3}\times \sqrt{3}$ reconstruction was found, which is explained by an extra-buckling model. Pronounced quasi-particle interferences (QPI) patterns, originating from both the intervalley and intravalley scattering, were observed. From the QPI patterns we derived a linear energy-momentum dispersion and a large Fermi velocity, which prove the existence of Dirac Fermions in silicene.
description: 6 pages, 4 figures
"The farmer he must feed them all": agrarian thought in Alberta, 1909-1921
Creators: name: Rennie, Bradford James
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: JL 499 A5 R46 1992
subject: Agriculture - Alberta - History
subject: United Farmers of Alberta
subject: Alberta - Politics and government - 1905-1921

description: Bibliography: p. 108-117.
Universally Coupled Massive Gravity, II: Densitized Tetrad and Cotetrad Theories
Creators: name: Pitts, J. Brian
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Einstein's equations in a tetrad formulation are derived from a linear theory in flat spacetime with an asymmetric potential using free field gauge invariance, local Lorentz invariance and universal coupling. The gravitational potential can be either covariant or contravariant and of almost any density weight. These results are adapted to produce universally coupled massive variants of Einstein's equations, yielding two one-parameter families of distinct theories with spin 2 and spin 0. The theories derived, upon fixing the local Lorentz gauge freedom, are seen to be a subset of those found by Ogievetsky and Polubarinov some time ago using a spin limitation principle. In view of the stability question for massive gravities, the proven non-necessity of positive energy for stability in applied mathematics in some contexts is recalled. Massive tetrad gravities permit the mass of the spin 0 to be heavier than that of the spin 2, as well as lighter than or equal to it, and so provide phenomenological flexibility that might be of astrophysical or cosmological use.
description: 2 figures. Forthcoming in General Relativity and Gravitation
On The Hermite Based-Second Kind Genocchi Polynomials
Creators: name: Kurt, Burak
name: Simsek, Yilmaz
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 05A10 (Primary) 11B65, 11B68 (Secondary)

description: The aim of this paper is to study generating function of the Hermite-Kampė de Fėriet based second kind Genocchi polynomials. We also give some identities related to these polynomials.
description: 5
Current Induced Nuclear Spin Depolarization at Landau Level Filling Factor nu=1/2
Creators: name: Li, Y. Q.
name: Umansky, V.
name: von Klitzing, K.
name: Smet, J. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hyperfine interactions between electron and nuclear spins in the quantum Hall regime provide powerful means for manipulation and detection of nuclear spins. In this work we demonstrate that significant changes in nuclear spin polarization can be created by applying an electric current in a 2-dimensional electron system at Landau level filling factor nu=1/2. Electron spin transitions at nu= 2/3 and 1/2 are utilized for the measurement of the nuclear spin polarization. Consistent results are obtained from these two different methods of nuclear magnetometry. The finite thickness of the electron wavefunction is found to be important even for a narrow quantum well. The current induced effect on nuclear spins can be attributed to electron heating and the efficient coupling between the nuclear and electron spin systems at nu=1/2. The electron temperature, elevated by the current, can be measured with a thermometer based on the measurement of the nuclear spin relaxation rate. The nuclear spin polarization follows a Curie law dependence on the electron temperature. This work also allows us to evaluate the electron g-factor in high magnetic fields as well as the polarization mass of composite fermions.
description: 13 pages, 11 figures
Topographic Feature Extraction for Bengali and Hindi Character Images
Creators: name: Bag, Soumen
name: Harit, Gaurav
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Feature selection and extraction plays an important role in different classification based problems such as face recognition, signature verification, optical character recognition (OCR) etc. The performance of OCR highly depends on the proper selection and extraction of feature set. In this paper, we present novel features based on the topography of a character as visible from different viewing directions on a 2D plane. By topography of a character we mean the structural features of the strokes and their spatial relations. In this work we develop topographic features of strokes visible with respect to views from different directions (e.g. North, South, East, and West). We consider three types of topographic features: closed region, convexity of strokes, and straight line strokes. These features are represented as a shape-based graph which acts as an invariant feature set for discriminating very similar type characters efficiently. We have tested the proposed method on printed and handwritten Bengali and Hindi character images. Initial results demonstrate the efficacy of our approach.
Radio Galaxy 3C 230 Observed with Gemini Laser-Adaptive-Optics Integral-Field Spectroscopy
Creators: name: Steinbring, Eric
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Altair laser-guide-star adaptive optics facility combined with the Near-Infrared Integral Field Spectrometer (NIFS) on Gemini North have been employed to study the morphology and kinematics of 3C 230 at z=1.5, the first such observations of a high-redshift radio galaxy. These suggest a bi-polar outflow spanning 0"9 (~16 kpc projected distance for a standard lambda-CDM cosmology) reaching a mean relative velocity of 235 km/s in redshifted H-alpha + [NII] and [SII] emission. Structure is resolved to 0"1 (0.8 kpc), well correlated with optical images from the Hubble Space Telescope and Very Large Array radio maps obtained at similar spatial resolution. Line diagnostics suggest that over the 10^7 yr to 10^8 yr duration of its AGN activity, gas has been ejected into bright turbulent lobes at rates comparable to star formation, although constituting perhaps only 1 percent of the baryonic mass in the galaxy.
description: 14 pages, 5 figures, accepted for publication in Astronomical Journal
Taiwan and the off-shore islands in Taiwan-U.S. relations, 1953-55
Creators: name: Zhang, Yufeng
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: E 183.8 T3 Z43 1992
subject: United States - Foreign relations - Taiwan
subject: Taiwan - Foreign relations - United States
subject: United States - Politics and government - 1953-1961
subject: Taiwan - Politics and government - 1945-1975

description: Bibliography: p. 114-118.
Functionalized adamantane: fundamental building blocks for nanostructure self-assembly
Creators: name: Garcia, Joelson Cott
name: Justo, João F.
name: Machado, Wanda V. M.
name: Assali, Lucy V. C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report first principles calculations on the electronic and structural properties of chemically functionalized adamantane molecules, either in isolated or crystalline forms. Boron and nitrogen functionalized molecules, aza-, tetra-aza-, bora-, and tetra-bora-adamantane, were found to be very stable in terms of energetics, consistent with available experimental data. Additionally, a hypothetical molecular crystal in a zincblende structure, involving the pair tetra-bora-adamantane and tetra-aza-adamantane, was investigated. This molecular crystal presented a direct and large electronic bandgap and a bulk modulus of 20 GPa. The viability of using those functionalized molecules as fundamental building blocks for nanostructure self-assembly is discussed.
"Yours is the sea, the canoes, and the nets": late prehistoric fishing economy on Motupore Island, P.N.G.
Creators: name: Chatan, Robbin
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: DU 740.3 C43 1993
subject: Fishing, Prehistoric - Papua New Guinea - Motupore Island
subject: Motupore Island (Papua New Guinea) - Antiquities
subject: Excavations (Archaeology) - Papua New Guinea - Motupore Island

description: Bibliography: p. 188-208.
Global second derivative estimates for the second boundary value problem of the prescribed affine mean curvature and Abreu's equations
Creators: name: Le, Nam Q.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper we prove the global second derivative estimates for the second boundary value problem of the prescribed affine mean curvature equation where the affine mean curvature is only assumed to be in $L^{p}$. Our result extends previous result by Trudinger and Wang in the case of globally bounded affine mean curvature and also covers Abreu's equation.
General parametrization for energy density of quintessence field
Creators: name: Akthar, Shiriny
name: Hossain, Md. Wali
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a general parametrization for energy density of a quintessence field, a minimally coupled canonical scalar field which rolls down slowly during the late time. This parametrization can mimic all classes of quintessence dynamics, namely scaling-freezing, tracker and thawing dynamics for any redshift. For thawing dynamics the parametrization needs two free parameters while for scaling-freezing and tracker dynamics it needs at least four free parameters. More parameters make the model less interesting from the observational data analysis point of view but as we expect more precise data in future it may be possible to constrain the models with multiple free parameters which can tell about the dynamics more precisely. One of the main advantage of this parametrization is that it reduces the computational time to significant amount while mimicking the actual scalar field dynamics for all redshifts which may not be possible with other existing parametrizations. We compare the parametrization with two and four parameters with the standard $Λ$CDM model, $w$CDM and Chevallier-Polarski-Linder (CPL) parametrizations using cosmological observational data from Planck 2018 (distance priors), DESI $2024$ DR1, PantheonPlus, Hubble parameter measurements and the redshift space distortion. We find that the observational data prefers standard $Λ$CDM model over other models. If we allow phantom region then it is more preferred by the data compared to non-phantom thawing quintessence. Our analysis does not show any preference of the dynamical dark energy over a cosmological constant except for the CPL parametrization.
description: 27 pages, 1 table, 10 figures, Accepted in JCAP
Palynology of the Bastion Ridge and Strand Fiord formations, western Axel Heiberg Island, Canadian Arctic Islands, N.W.T.: implications for stratigraphy, age, paleoenvironment and Nyktericysta taxonomy
Creators: name: MacRae, Robert Andrew
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: QE 993 P28 1992a
subject: Additional Copy: QE 993 P28 1992
subject: Palynology
subject: Palynology - Northwest Territories - Bastion Ridge Region
subject: Palynology - Northwest Territories - Strand Fiord Region

description: Bibliography: p. 224-242.
Fermionic Superfluid from a Bilayer Band Insulator in an Optical Lattice
Creators: name: Prasad, Yogeshwar
name: Medhi, Amal
name: Shenoy, Vijay B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose a model to realize a fermionic superfluid state in an optical lattice circumventing the cooling problem. Our proposal exploits the idea of tuning the interaction in a characteristically low entropy state, a band-insulator in an optical bilayer system, to obtain a superfluid. By performing a detailed analysis of the model including fluctuations and augmented by a variational quantum Monte Carlo calculations of the ground state, we show that the superfluid state obtained has high transition temperature of the order of the hopping energy. Our system is designed to suppress other competing orders such as a charge density wave. We suggest a laboratory realization of this model via an orthogonally shaken optical lattice bilayer.
description: 5 pages, 7 figures, typos fixed, figures modified
Aharonov-Bohm interference for a hole in a two-dimensional Ising antiferromagnet in a transverse magnetic field
Creators: name: Berciu, Mona
name: Fehske, Holger
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that a proper consideration of the contribution of Trugman loops leads to a fairly low effective mass for a hole moving in a square lattice Ising antiferromagnet, if the bare hopping and the exchange energy scales are comparable. This contradicts the general view that because of the absence of spin fluctuations, this effective mass must be extremely large. Moreover, in the presence of a transverse magnetic field, we show that the effective hopping integrals acquire an unusual dependence on the magnetic field, through Aharonov-Bohm interference, in addition to significant retardation effects. The effect of the Aharonov-Bohm interference on the cyclotron frequency (for small magnetic fields) and the Hofstadter butterfly (for large magnetic fields) is analyzed.
description: 12 pages, 11 figures
Does informativeness trade off with coding length or with system complexity?
Creators: name: Haspelmath, Martin
Publisher: name: Zenodo
Year: 2023

description: In this talk, I give an overview of the efficiency theory of asymmetric coding in grammar, and I ask to what extent so-called "simplicity/informativeness trade-off" phenomena are better explained by frequency-induced shortness of coding (due to the bisyllabic morph constraint) than by a trade-off between informativenss and cognitive simplicity.
Uncertainty Relation for Chaos
Creators: name: Yahalom, A.
name: Lewkowicz, M.
name: Levitan, J.
name: Elgressy, G.
name: Horwitz, L. P.
name: Ben-Zion, Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: A necessary condition for the emergence of chaos is given. It is well known that the emergence of chaos requires a positive exponent which entails diverging trajectories. Here we show that this is not enough. An additional necessary condition for the emergence of chaos in the region where the trajectory of the system goes through, is that the product of the maximal positive exponent times the duration in which the system configuration point stays in the unstable region should exceed unity. We give a theoretical analysis justifying this result and a few examples.
description: 5 pages, 6 figures
How the First World War was almost lost: Anglo-French relations and the March crisis of 1918
Creators: name: Hanks, Robert K.
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: D 546 H35 1992
subject: World War, 1914-1918 - Great Britain
subject: World War, 1914-1918 - France
subject: Great Britain - Foreign relations - France
subject: France - Foreign relations - Great Britain
subject: World War, 1914-1918 - Diplomatic history

description: Bibliography: p. 190-201.
Cycles are strongly Ramsey-unsaturated
Creators: name: Skokan, Jozef
name: Stein, Maya
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C55

description: We call a graph H Ramsey-unsaturated if there is an edge in the complement of H such that the Ramsey number r(H) of H does not change upon adding it to H. This notion was introduced by Balister, Lehel and Schelp who also proved that cycles (except for $C_4$) are Ramsey-unsaturated, and conjectured that, moreover, one may add any chord without changing the Ramsey number of the cycle $C_n$, unless n is even and adding the chord creates an odd cycle. We prove this conjecture for large cycles by showing a stronger statement: If a graph H is obtained by adding a linear number of chords to a cycle $C_n$, then $r(H)=r(C_n)$, as long as the maximum degree of H is bounded, H is either bipartite (for even n) or almost bipartite (for odd n), and n is large. This motivates us to call cycles strongly Ramsey-unsaturated. Our proof uses the regularity method.
Fast and Accurate Modeling of Molecular Atomization Energies with Machine Learning
Creators: name: Rupp, Matthias
name: Tkatchenko, Alexandre
name: Müller, Klaus-Robert
name: von Lilienfeld, O. Anatole
Publisher: name: arXiv
Year: 2011
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We introduce a machine learning model to predict atomization energies of a diverse set of organic molecules, based on nuclear charges and atomic positions only. The problem of solving the molecular Schrödinger equation is mapped onto a non-linear statistical regression problem of reduced complexity. Regression models are trained on and compared to atomization energies computed with hybrid density-functional theory. Cross-validation over more than seven thousand small organic molecules yields a mean absolute error of ~10 kcal/mol. Applicability is demonstrated for the prediction of molecular atomization potential energy curves.
Plato's philosopher and the Jivanmukta: a comparison of two views of human perfection
Creators: name: Clayton, Barbra Robina
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: B 105 P47 C53 1993
subject: Madhava, d. 1386 - Contributions in theory of perfection
subject: Perfection
subject: Plato. Republic
subject: Madhava, d. 1386. Jivanmuktiviveka
subject: Plato - Contributions in theory of perfection
subject: Advaita

description: Bibliography: p. 147-150.