cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Timescape cosmology with radiation fluid
Creators: name: Duley, James A. G.
name: Nazer, M. Ahsan
name: Wiltshire, David L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The timescape cosmology represents a potentially viable alternative to the standard homogeneous cosmology, without the need for dark energy. Although average cosmic evolution in the timescape scenario only differs substantially from that of Friedmann-Lemaitre model at relatively late epochs when the contribution from the energy density of radiation is negligible, a full solution of the Buchert equations to incorporate radiation is necessary to smoothly match parameters to the epoch of photon decoupling and to obtain constraints from cosmic microwave background data. Here we extend the matter-dominated solution found in earlier work to include radiation, providing series solutions at early times and an efficient numerical integration strategy for generating the complete solution. The numerical solution is used to directly calculate the scale of the sound horizon at decoupling, and at the baryon drag epoch. The constraints on these scales from the Planck satellite data yield bounds on the timescape cosmological parameters, which are found to also agree with the best-fit values from a recent analysis of SDSS-II supernova data, while avoiding the problem of a primordial lithium-7 abundance anomaly.
description: 21 pages, 6 figures; v2: small additions, accepted by Class. Quantum Grav
A personal story of identity and voice
Creators: name: Solomon-Green, Leonie
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: I am an Aboriginal woman working in a Victorian State Government Department. My current role in the Local Indigenous Network is to facilitate Indigenous voices to be heard in local and state government policy development processes. I live and work in two worlds and I am searching for a space where all voices can have a turn to speak and are respectfully listened to. Using a postcolonial framework I am interested in exploring my own experiences, feelings and intellectual responses to the interactions that I am involved in my two worlds. The thesis explores the dilemmas and complexities associated with this role and I describe the bi-annual Deadly in Gippsland Conferences I initiated in response to my experiences of the silencing of indigenous voices. I examine the historical context that give rise to nature of the interaction between white voices and indigenous voices in the interface between bureaucratic spaces and community spaces. In my conversations with my community members and Elders I am aware of the overwhelming weariness and mistrust that lies behind these interactions. In the thesis I have chosen to use visual representation “to give voice” (Estrella and Forinash, 2013, p.318) to my thinking. As a medium for expression it enables me to communicate often difficult and emotional ideas. Art has been used by all cultures to communicate history and ideas before the written word (Taylor, 1992, p.111) and in our Aboriginal culture oral stories and pictures are used to pass on information from one to another. My pictures are used within the qualitative research method of autoethnography. Daniels (2010) suggests that autoethnography “is a contemporary form of an ancient practice. Indigenous cultures from across the world have used the power of story to transform and construct knowledge from an experience for thousands of years” (p. 14). Each picture in the thesis helps me to explore and unpack my experiences, my reactions, and my emotions. Therefore my pictures and my words can be understood as an invitation to you the reader to “enter and feel” with me some of the experiences I am describing. For me, writing this autoethnography has been more than just telling my own story. It has been about the process of finding my voice, of freeing myself from what hooks (1989) calls “the bonds of secrecy and silence” (p.156). This thesis has help me explore ways in which I have come to understand myself, the culture I identify most strongly with, and my place in my community. The question I now have to reflect on is how can I work differently as an Aboriginal community development broker between a non-Aboriginal Government and Aboriginal communities? I don’t want to merely consult anymore
Driving Perpendicular Heat Flow: Ambipolar Transverse Thermoelectrics for Microscale and Cryogenic Peltier Cooling
Creators: name: Zhou, Chuanle
name: Birner, S.
name: Tang, Yang
name: Heinselman, K.
name: Grayson, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Whereas thermoelectric performance is normally limited by the figure of merit ZT, transverse thermoelectrics can achieve arbitrarily large temperature differences in a single leg even with inferior ZT by being geometrically tapered. We introduce a band-engineered transverse thermoelectric with p-type Seebeck in one direction and n-type orthogonal, resulting in off-diagonal terms that drive heat flow transverse to electrical current. Such materials are advantageous for microscale devices and cryogenic temperatures -- exactly the regimes where standard longitudinal thermoelectrics fail. InAs/GaSb type II superlattices are shown to have the appropriate band structure for use as a transverse thermoelectric.
description: 5 pages, 3 figures
Rayleigh waves in anisotropic crystals rotating about the normal to a symmetry plane
Creators: name: Destrade, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The propagation of surface acoustic waves in a rotating anisotropic crystal is studied. The crystal is monoclinic and cut along a plane containing the normal to the symmetry plane; this normal is also the axis of rotation. The secular equation is obtained explicitly using the "method of the polarization vector", and it shows that the wave is dispersive and decelerates with increasing rotation rate. The case of orthorhombic symmetry is also treated. The surface wave speed is computed for 12 monoclinic and 8 rhombic crystals, and for a large range of the rotation rate/wave frequency ratio.
Growth of regulators in finite abelian coverings
Creators: name: Le, Thang T. Q.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Topology (math.AT)
subject: Dynamical Systems (math.DS)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 54H20, 56S30, 57Q10, 37B50, 37B10, 43A07

description: We show that the regulator, which is the difference between the homology torsion and the combinatorial Ray-Singer torsion, of fnite abelian coverings of a fixed complex has sub-exponential growth rate.
description: 13 pages
EMPHASIS-PREP Deliverable D6.3: Report on services tested and potential KPIs (key performance indicators)
Creators: name: Fahrner, Sven
name: Pieruschka, Roland
Publisher: name: Zenodo
Year: 2021
Subjects: plant phenotyping, research infrastructure, service provision

description: Executive Summary This Deliverable summarises the concepts and evaluation approach to EMPHASIS pilot services which have been developed and conceptualised in the framework of the EMPHASIS-Prep project and represent a subset of the final service protfolio. These services will be delivered to the user community already within the Implementation Phase in order to (1) help further increase visibility of EMPHASIS with its stakeholders, (2) illustrate that EMPHASIS can deliver benefits, and (3) test feasibility and learn “operational procedures” in pan-European service provision. The success of the pilot services will be evaluated at the end of the Implementation Phase, and experiences gained used in service provision in the Operational Phase. The pilot services address user demand identified in the EMPHASIS-Prep mapping activities in the first project period including fields of : Field phenotyping, Innovation, Harmonisation, Data management, Modelling, and Training. The objectives and work plan of each pilot service as well as key performance indicators needed for their evaluation are presented in this deliverable.
Proposed Detection of Time Reversal Symmetry in Topological Surface States
Creators: name: Zhang, Degang
name: Ting, C. S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: By employing T-matrix approach, we investigate a nonmagnetic impurity located on the surface of three-dimensional topological insulators, where the time reversal symmetry is preserved. It is shown that the images of the local density of states (LDOS) around the single impurity have the dip-hump structures with six-fold symmetry at different bias voltages. The peaks are produced by quasiparticle interference while the local minima at the backscattering wave vectors are due to the absence of backscatterings. With increasing the bias voltage, the peaks and dips move forward to the location of the impurity. These dips at the backscattering wave vectors in the LDOS spectra can be regarded as a signature of the time reversal symmetry in the topological surface states, which could be observed by scanning tunneling microscopy.
description: 4 pages, 4 figures
Supplementary Methods for Renal Mass Reduction Increases the Response to Exogenous Insulin Independent of Acid-Base Status or Plasma Insulin Levels in Rats.
Creators: name: Mannon, Elinor
name: Sartain, Christina
name: Wilkes, Trevin
name: Sun, Jingping
name: Polichnowski, Aaron
name: O'Connor, Paul
Publisher: name: figshare
Year: 2021
Subjects: subject: Physiology
subject: FOS: Biological sciences

description: Supplementary methods and figures for the manuscript, "Renal Mass Reduction Increases the Response to Exogenous Insulin Independent of Acid-Base Status or Plasma Insulin Levels in Rats".
Enhancing Waterfowl Habitat: Alternatives in Northern Mississippi River Delta Watersheds
Creators: name: Thiemann, Otto P.
name: Thiemann, Otto P.
Publisher: name: Unknown
Year: 1976
Subjects: subject: Land Economics/Use
subject: Resource /Energy Economics and Policy
subject: Waterfowl Habitat
subject: Small Watershed Projects
subject: Market for Waterfowl Hunting Rights
subject: Enhancement Practices

description: A survey of 46 landowners, or their representatives, indicated 13 received income for providing waterfowl habitat and/or hunting rights to hunters. Gross income per acre ranged from $0.33 to $11.43 and averaged $3.54, while gross income per enterprise averaged $5,250 and ranged from $1,000 to $20,000. Waterfowl habitat can be enhanced by providing food and water areas by individual landowners or through group action such as Small Watershed Projects. Inclusion of water level control devices in channels and judicious placement of spoil can provide significant areas of waterfowl habitat.
description: This study was funded by the Soil Conservation Service through transfer of watershed funds to the Economic Research Service.
Entanglement of four qubit systems: a geometric atlas with polynomial compass I (the finite world)
Creators: name: Holweck, Frédéric
name: Luque, Jean-Gabriel
name: Thibon, Jean-Yves
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We investigate the geometry of the four qubit systems by means of algebraic geometry and invariant theory, which allows us to interpret certain entangled states as algebraic varieties. More precisely we describe the nullcone, i.e., the set of states annihilated by all invariant polynomials, and also the so called third secant variety, which can be interpreted as the generalization of GHZ-states for more than three qubits. All our geometric descriptions go along with algorithms which allow us to identify any given state in the nullcone or in the third secant variety as a point of one of the 47 varieties described in the paper. These 47 varieties correspond to 47 non-equivalent entanglement patterns, which reduce to 15 different classes if we allow permutations of the qubits.
description: 48 pages, 7 tables, 13 figures, references and remarks added (v2)
A Fokker-Planck description for the queue dynamics of large tick stocks
Creators: name: Gareche, A.
name: Disdier, G.
name: Kockelkoren, J.
name: Bouchaud, J. -P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Trading and Market Microstructure (q-fin.TR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: Motivated by empirical data, we develop a statistical description of the queue dynamics for large tick assets based on a two-dimensional Fokker-Planck (diffusion) equation, that explicitly includes state dependence, i.e. the fact that the drift and diffusion depends on the volume present on both sides of the spread. "Jump" events, corresponding to sudden changes of the best limit price, must also be included as birth-death terms in the Fokker-Planck equation. All quantities involved in the equation can be calibrated using high-frequency data on best quotes. One of our central finding is the the dynamical process is approximately scale invariant, i.e., the only relevant variable is the ratio of the current volume in the queue to its average value. While the latter shows intraday seasonalities and strong variability across stocks and time periods, the dynamics of the rescaled volumes is universal. In terms of rescaled volumes, we found that the drift has a complex two-dimensional structure, which is a sum of a gradient contribution and a rotational contribution, both stable across stocks and time. This drift term is entirely responsible for the dynamical correlations between the ask queue and the bid queue.
DEP Bulletin:Volume 33 Issue 18
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 2009

description: The DEP bulletin is a semi-monthly publication of the New Jersey Department of Environmental Protection. It contains a list of construction permit applications recently filed or acted upon by the Department along with a calendar of events of interest, a schedule of public hearings, and Environmental Impact Statements acted upon during the period.
Spin filter effect at room temperature in GaN/GaMnN ferromagnetic resonant tunneling diode
Creators: name: Wójcik, P.
name: Adamowski, J.
name: Wołoszyn, M.
name: Spisak, B. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have investigated the spin current polarization without the external magnetic field in the resonant tunneling diode with the emitter and quantum well layers made from the ferromagnetic GaMnN. For this purpose we have applied the self-consistent Wigner-Poisson method and studied the spin-polarizing effect of the parallel and antiparallel alignment of the magnetization in the ferromagnetic layers. The results of our calculations show that the antiparallel magnetization is much more advantageous for the spin filter operation and leads to the full spin current polarization at low temperatures and 35 % spin polarization of the current at room temperature.
description: 4 pages, 5 figures
A non-self-adjoint Lebesgue decomposition
Creators: name: Kennedy, Matthew
name: Yang, Dilian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L50, 46B04, 47L55, 47B32

description: We study the structure of bounded linear functionals on a class of non-self-adjoint operator algebras that includes the multiplier algebra of every complete Nevanlinna-Pick space, and in particular the multiplier algebra of the Drury-Arveson space. Our main result is a Lebesgue decomposition expressing every linear functional as the sum of an absolutely continuous (i.e. weak-* continuous) linear functional, and a singular linear functional that is far from being absolutely continuous. This is a non-self-adjoint analogue of Takesaki's decomposition theorem for linear functionals on von Neumann algebras. We apply our decomposition theorem to prove that the predual of every algebra in this class is (strongly) unique.
description: 20 pages
Simulation informatique de l'engagement productif des élèves dans une salle de cours
Creators: name: Gnanguenon, Mankponse Augustin
name: Alladatin, Judicaël
Publisher: name: Zenodo
Year: 2022
Subjects: engagement productif, scolarisation, simulation informatique, Maroc

description: L’éducation est le socle de l’épanouissement individuel de tout homme et des transformations sociétales. Elle occupe donc une place très importante dans le développement économique et social des nations. L’ODD N° 4 qui vise essentiellement le développement de l’éducation primaire et secondaire est au centre de l’atteinte de tous les ODD (Unesco, 2017). A cet effet, les différents pays du monde dont le Maroc, se mobilisent pour non seulement assurer une scolarisation inclusive de tous les enfants mais aussi offrir un service éducatif de qualité. L’engagement et la mobilisation des élèves dans les tâches scolaires est aujourd’hui aux cœurs des débats scientifique de l’éducation. Car ils peuvent être déterminant dans l’accrochage et le décrochage scolaire (Blaya, 2010; Li & Chen, 2018). Bien qu’en étant sous l’influence des parents, l’engagement personnel des élèves dans leur scolarisation dépend aussi fortement du système éducatif, notamment à travers les politiques éducatives, les infrastructures mais également des enseignants qui sont en contact avec les élèves. Sur le plan de la performance scolaire des élèves et de leur détermination à leurs scolarisations, les enseignants jouent un rôle primordial de médiation. À travers nos travaux de recherche, nous ambitionnons utiliser les simulations informatiques multi-agents de salle de cours pour modéliser l’engagement productif des élèves au Maroc. Notre objectif principal est de comprendre comment la médiation de l'enseignant en classe avec les élèves à l'aide de simulations informatiques influence l'engagement productif des élèves. La modélisation sera basée sur des données réelles des élèves du Maroc afin d’assoir un outil d’aide à la décision contextualisé. Cette communication expose les résultats d’une première tentative de simulation basée sur des données fictives.
Impacts of Recreation Subdivisions in the South-Central Mountains of Colorado
Creators: name: Hoover, Herbert
name: Hoover, Herbert
Publisher: name: Unknown
Year: 1976
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: Land Economics/Use
subject: Resource /Energy Economics and Policy
subject: Recreation
subject: Mail survey
subject: Public utilities
subject: Building
subject: FOS: Civil engineering
subject: Vacation
subject: Land utilization
subject: Economic impact
subject: Wildlife
subject: Developing areas

description: Briefly describes the characteristics of 58 recreation subdivisions in Chaffee, Custer, Fremont, Huerfano, Lake, Las Animas, and Pueblo Counties in Colorado platted between 1967 and 1972, as well as characteristics of lot owners. The main emphasis of the study was on a sample mail survey of lot owners. The survey indicated that inmigration and housing construction have been low. About 42 percent of sample lot owners visited their properties in 1973, each staying an average of 3 weeks. Total expenditures in the project area by all 328 sample lot owners were $118,637 in 1973, or $362 per owner.
description: This study of recreation subdivisions was done at the request of the Sangre de Cristo Project Council of the Resource Conservation and Development (RC&D) Project. This report is the third in a series of three on the impact of rural subdivisions on the Sangre de Cristo RC&D project area.
Critically-rotating accretors and non-conservative evolution in Algols
Creators: name: Deschamps, R.
name: Siess, L.
name: Davis, P. J.
name: Jorissen, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: During the mass-transfer phase in Algol systems, a large amount of mass and angular momentum are accreted by the gainer star which can be accelerated up to its critical Keplerian velocity. The fate of the gainer once it reaches this critical value is unclear. We investigate the orbital and stellar spin evolution in semi-detached binary systems, specifically for systems with rapidly rotating accretors. Our aim is to better distinguish between the different spin-down mechanisms proposed which can consistently explain the slow rotation observed in Algols' final states and assess the degree of non-conservatism due to the formation of a hotspot. We use our state-of-the-art binary evolution code, Binstar, which incorporates a detailed treatment of the orbital and stellar spin, including all torques due to mass transfer, the interactions between a star and its accretion disc, tidal effects and magnetic braking. We also present a new prescription for mass loss due to the formation of a hotspot based on energy conservation. The coupling between the star and the disc via the boundary layer prevents the gainer from exceeding the critical rotation. Magnetic-field effects, although operating, are not the dominant spin-down mechanism for sensible field strengths. Spin down owing to tides is 2-4 orders of magnitudes too weak to compensate the spinning-up torque due to mass accretion. Moreover, we find that the final separation strongly depends on the spin-down mechanism. The formation of a hotspot leads to a large event of mass loss during the rapid phase of mass transfer. The degree of conservatism strongly depends on the opacity of the impacted material. A statistical study as well as new observational constraints are needed to find the optimal set of parameters (magnetic-field strength, hotspot geometry,...) to reproduce Algol evolutions.
description: 16 pages, 17 figures, 2 tables, accepted for publication in A&A
Supporting information: Controls on methylmercury concentrations in lakes and streams of peatland-rich catchments along a 1700 km permafrost gradient
Creators: Lauren M Thompson
McKenzie A Kuhn
Johanna C Winder
Lucas PP Braga
Ryan HS Hutchins
Andrew J Tanentzap
Vincent L St. Louis
David Olefeldt
Publisher: name: University of Alberta Library
Year: 2022

Supporting information: "Controls on methylmercury concentrations in lakes and streams of peatland-rich catchments along a 1700 km permafrost gradient."

Figure S1: Satellite imagery, hydrographs, and flowpaths of study regions; Figure S2: Regression of unfiltered MeHg and SUVA254; Figure S3: Principal component analysis of dissolved organic matter quality variables; Figure S4: Components identified by parallel factor analysis for measured excitation-emission spectra from the sampling sites; Figure S5: Regression of unfiltered MeHg and ratio of hgcA to 16S rRNA with groundwater indicators; Figure S6: Regression of merA with merB, and unfiltered MeHg with merB; Figure S7: Heat maps of water chemistry against identified clades with HgII methylating (hgcA), reducing (merA), and MeHg demethylating (merB) genes in lake sediments; Table S1. perANOVA analysis of Fe, pH, DOC, S, and EC separated by waterbody type and region; Table S2. perANOVA analysis of THg, MeHg, %MeHg separated by waterbody type and region; Table S3. Spectral composition of the five fluorescence compounds identified using parallel factor analysis; Table S4. perANOVA analysis on proportion of hgcA and merA to housekeeping gene 16S rRNA, separated by permafrost extent; Table S5. perMANOVA analysis on gene diversity in lake sediments, separated by permafrost extent; supporting data.
Fragmentation and dynamical collapse of the starless high-mass star-forming region IRDC18310-4
Creators: name: Beuther, H.
name: Linz, H.
name: Tackenberg, J.
name: Henning, Th.
name: Krause, O.
name: Ragan, S.
name: Nielbock, M.
name: Launhardt, R.
name: Bihr, S.
name: Schmiedeke, A.
name: Smith, R.
name: Sakai, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims: We study the fragmentation and dynamical properties of a massive starless gas clump at the onset of high-mass star formation. Methods: Based on Herschel continuum data we identify a massive gas clump that remains far-infrared dark up to 100mum wavelengths. The fragmentation and dynamical properties are investigated by means of Plateau de Bure Interferometer and Nobeyama 45m single-dish spectral line and continuum observations. Results: The massive gas reservoir fragments at spatial scales of ~18000AU in four cores. Comparing the spatial extent of this high-mass region with intermediate- to low-mass starless cores from the literature, we find that linear sizes do not vary significantly over the whole mass regime. However, the high-mass regions squeeze much more gas into these similar volumes and hence have orders of magnitude larger densities. The fragmentation properties of the presented low-to high-mass regions are consistent with gravitational instable Jeans fragmentation. Furthermore, we find multiple velocity components associated with the resolved cores. Recent radiative transfer hydrodynamic simulations of the dynamic collapse of massive gas clumps also result in multiple velocity components along the line of sight because of the clumpy structure of the regions. This result is supported by a ratio between viral and total gas mass for the whole region <1. Conclusions: This apparently still starless high-mass gas clump exhibits clear signatures of early fragmentation and dynamic collapse prior to the formation of an embedded heating source. A comparison with regions of lower mass reveals that the linear size of star-forming regions does not necessarily have to vary much for different masses, however, the mass reservoirs and gas densities are orders of magnitude enhanced for high-mass regions compared to their lower-mass siblings.
description: 11 pages, 10 figures, accepted to Astronomy and Astrophysics, high-resolution version with all figures included can be found at http://www.mpia.de/homes/beuther/papers.html
Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV
Creators: name: Mchedlishvili, D.
name: Barsov, S.
name: Carbonell, J.
name: Chiladze, D.
name: Dymov, S.
name: Dzyuba, A.
name: Engels, R.
name: Gebel, R.
name: Glagolev, V.
name: Grigoryev, K.
name: Goslawski, P.
name: Hartmann, M.
name: Imambekov, O.
name: Kacharava, A.
name: Kamerdzhiev, V.
name: Keshelashvili, I.
name: Khoukaz, A.
name: Komarov, V.
name: Kulessa, P.
name: Kulikov, A.
name: Lehrach, A.
name: Lomidze, N.
name: Lorentz, B.
name: Macharashvili, G.
name: Maier, R.
name: Merzliakov, S.
name: Mielke, M.
name: Mikirtychyants, M.
name: Mikirtychyants, S.
name: Nioradze, M.
name: Ohm, H.
name: Papenbrock, M.
name: Prasuhn, D.
name: Rathmann, F.
name: Serdyuk, V.
name: Seyfarth, H.
name: Stein, H. J.
name: Steffens, E.
name: Stockhorst, H.
name: Ströher, H.
name: Tabidze, M.
name: Trusov, S.
name: Uzikov, Yu.
name: Valdau, Yu.
name: Wilkin, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.
description: 7 pages with 6 figures
Global simulations of magnetorotational turbulence I: convergence and the quasi-steady state
Creators: name: Parkin, E. R.
name: Bicknell, G. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Magnetorotational turbulence provides a viable mechanism for angular momentum transport in accretion disks. We present global, three dimensional (3D), MHD accretion disk simulations that investigate the dependence of the turbulent stresses on resolution. Convergence in the time-and-volume-averaged stress-to-gas-pressure ratio, at a value of $\sim0.04$, is found for a model with radial, vertical, and azimuthal resolution of 12-51, 27, and 12.5 cells per scale-height (the simulation mesh is such that cells per scale-height varies in the radial direction). A control volume analysis is performed on the main body of the disk (|z|<2H) to examine the production and removal of magnetic energy. Maxwell stresses in combination with the mean disk rotation are mainly responsible for magnetic energy production, whereas turbulent dissipation (facilitated by numerical resistivity) predominantly removes magnetic energy from the disk. Re-casting the magnetic energy equation in terms of the power injected by Maxwell stresses on the boundaries of, and by Lorentz forces within, the control volume highlights the importance of the boundary conditions (of the control volume). The different convergence properties of shearing-box and global accretion disk simulations can be readily understood on the basis of choice of boundary conditions and the magnetic field configuration. Periodic boundary conditions restrict the establishment of large-scale gradients in the magnetic field, limiting the power that can be delivered to the disk by Lorentz forces and by stresses at the surfaces. The factor of three lower resolution required for convergence in turbulent stresses for our global disk models compared to stratified shearing-boxes is explained by this finding. (Abridged)
description: 20 pages, 11 figures. (Submitted to MNRAS on 21st March 2013)
Does Magnetic Field-Rotation Misalignment Solve the Magnetic Braking Catastrophe in Protostellar Disk Formation?
Creators: name: Li, Zhi-Yun
name: Krasnopolsky, Ruben
name: Shang, Hsien
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Stars form in dense cores of molecular clouds that are observed to be significantly magnetized. In the simplest case of a laminar (non-turbulent) core with the magnetic field aligned with the rotation axis, both analytic considerations and numerical simulations have shown that the formation of a large, $10^2\au$-scale, rotationally supported protostellar disk is suppressed by magnetic braking in the ideal MHD limit for a realistic level of core magnetization. This theoretical difficulty in forming protostellar disks is termed "magnetic braking catastrophe". A possible resolution to this problem, proposed by \citeauthor{HennebelleCiardi2009} and \citeauthor{Joos+2012}, is that misalignment between the magnetic field and rotation axis may weaken the magnetic braking enough to enable disk formation. We evaluate this possibility quantitatively through numerical simulations. We confirm the basic result of \citeauthor{Joos+2012} that the misalignment is indeed conducive to disk formation. In relatively weakly magnetized cores with dimensionless mass-to-flux ratio $\gtrsim 5$, it enabled the formation of rotationally supported disks that would otherwise be suppressed if the magnetic field and rotation axis are aligned. For more strongly magnetized cores, disk formation remains suppressed, however, even for the maximum tilt angle of $90\degree$. If dense cores are as strongly magnetized as indicated by OH Zeeman observations (with a mean dimensionless mass-to-flux ratio $\sim 2$), it would be difficult for the misalignment alone to enable disk formation in the majority of them. We conclude that, while beneficial to disk formation, especially for the relatively weak field case, the misalignment does not completely solve the problem of catastrophic magnetic braking in general.
description: 29 pages, 8 figures, submitted to ApJ
Analisis Implementasi Capsa Banting dengan Menerapkan Algoritma Backtracking
Creators: name: zone, lalala
Publisher: name: figshare
Year: 2023
Subjects: Information systems education

description: Artikel ini membahas implementasi algoritma backtracking dalam permainan Capsa Banting. Capsa Banting adalah permainan kartu yang membutuhkan strategi cerdas untuk mencapai kemenangan. Algoritma backtracking digunakan untuk menemukan solusi efektif dalam menyelesaikan permainan ini dengan melakukan penelusuran sistematis melalui semua kemungkinan solusi yang ada. Pendekatan algoritma greedy juga dibandingkan dengan algoritma backtracking dalam artikel ini. Metode analisis digunakan untuk menganalisis implementasi permainan Capsa Banting dengan algoritma backtracking.. Analisis perbandingan dilakukan untuk mengidentifikasi hasil dari masing-masing pendekatan. Hasil penelitian ini diharapkan dapat memberikan wawasan baru dalam menyusun strategi bermain Capsa Banting.
Trizygia Skuse 1888: 1137
Creators: name: Amorim, Dalton De Souza
name: Oliveira, Sarah Siqueira
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Trizygia

description: Trizygia Skuse
 Trizygia Skuse 1888: 1137, 1204. Type-species, T. flavipes Skuse (mon.).
 T. nitens Edwards 1940a: 462. Type-locality: Brazil, Santa Catarina, Nova Teutônia. Lectotype ♀, NHM (here designated).
(Figure 52)
 Notes. The type series included a male and a female syntypes. The male syntype could not be found at the NHM and the female syntype is herein designated lectotype of the species. Its labels are: “ Brasilien / Nova Teutonia / 27º 11’ S 52º 23’ W / Fritz Plaumann / 21.8.1938.” // “Brit Mus / 1938-40” // “SYN- / TYPE” [printed in black on a rounded label with red border]” // “ Trizygia / nitens [hw] / F.W. Edwards 193[pr]9[hw]” // “ HOLOTYPE [pr] / Trizygia / nitens [hw] / det. J.E. Chainey, 1996 [pr]” // “BMNH(E) # / 257923”. The abdomen of the lectotype is missing, but both wings and one of the fore-, one of the mid-, and one of the hindlegs are present, the hindleg with the final tarsomeres missing.
description: Published as part of Amorim, Dalton De Souza & Oliveira, Sarah Siqueira, 2013, Types of Neotropical Mycetophilidae (Diptera) at the Natural History Museum collection, London, pp. 1-119 in Zootaxa 3726 (1) on pages 22-23, DOI: 10.11646/zootaxa.3726.1.1, http://zenodo.org/record/5267220
A high order cell-centered semi-Lagrangian scheme for multi-dimensional kinetic simulations of neutral gas flows
Creators: name: Güçlü, Yaman
name: Hitchon, William N. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The term `Convected Scheme' (CS) refers to a family of algorithms, most usually applied to the solution of Boltzmann's equation, which uses a method of characteristics in an integral form to project an initial cell forward to a group of final cells. As such the CS is a `forward-trajectory' semi-Lagrangian scheme. For multi-dimensional simulations of neutral gas flows, the cell-centered version of this semi-Lagrangian (CCSL) scheme has advantages over other options due to its implementation simplicity, low memory requirements, and easier treatment of boundary conditions. The main drawback of the CCSL-CS to date has been its high numerical diffusion in physical space, because of the 2$^{\text{nd}}$ order remapping that takes place at the end of each time step. By means of a Modified Equation Analysis, it is shown that a high order estimate of the remapping error can be obtained a priori, and a small correction to the final position of the cells can be applied upon remapping, in order to achieve full compensation of this error. The resulting scheme is 4$^{\text{th}}$ order accurate in space while retaining the desirable properties of the CS: it is conservative and positivity-preserving, and the overall algorithm complexity is not appreciably increased. Two monotone (i.e. non-oscillating) versions of the fourth order CCSL-CS are also presented: one uses a common flux-limiter approach; the other uses a non-polynomial reconstruction to evaluate the derivatives of the density function. The method is illustrated in simple one- and two-dimensional examples, and a fully 3D solution of the Boltzmann equation describing expansion of a gas into vacuum through a cylindrical tube.
Transonic solutions of isothermal galactic winds in a cold dark matter halo
Creators: name: Tsuchiya, Masami
name: Mori, Masao
name: Nitta, Shin-ya
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study fundamental properties of steady, spherically symmetric, isothermal galactic outflow in appropriate gravitational potential models. We aim at constructing a universal scale free theory not only for galactic winds, but also for winds from clusters/groups of galaxies. In particular, we consider effects of mass-density distribution on the formation of transonic galactic outflows under several models of the density distribution profile predicted by cosmological simulations of structure formation based on the cold dark matter (CDM) scenario. In this study, we have clarified that there exists two types of transonic solutions: outflows from the central region and from distant region with a finite radius, depending upon the density distribution of the system. The system with sufficiently steep density gradient at the center is allowed to have the transonic outflows from the center. The resultant criterion intriguingly indicates that the density gradient at the center must be steeper than that of the prediction of conventional CDM model including Navarro, Frenk & White (1997) and Moore et al. (1999). This result suggests that an additional steeper density distribution originated by baryonic systems such as the stellar component and/or the central massive black hole is required to realize transonic outflow from the central region. On the other hand, we predict the outflow, which is started at the outskirts of the galactic center and is slowly-accelerated without any drastic energy injection like starburst events. These transonic outflows may contribute secularly to the metal enrichment of the intergalactic medium.
description: 10 pages, 6 figures and an appendix, accepted for publication in MNRAS
QED Bremsstrahlung in decays of electroweak bosons
Creators: name: Arbuzov, A. B.
name: Sadykov, R. R.
name: Was, Z.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Isolated lepton momenta, in particular their directions are the most precisely measured quantities in pp collisions at LHC. This offers opportunities for multitude of precision measurements. It is of practical importance to verify if precision measurements with lep- tons in the final state require all theoretical effects evaluated simultaneously or if QED bremsstrahlung in the final state can be separated without unwanted precision loss. Results for final state bremsstrahlung in the decays of narrow resonances are obtained from the Feynman rules of QED in an unambiguous way and can be controlled with a very high precision. Also for resonances of non-negligible width, if calculations are appropriately performed, such separation from the remaining electroweak effects can be expected. Our paper is devoted to validation that final state QED bremsstrahlung can indeed be separated from the rest of QCD and electroweak effects, in the production and decay of Z and W bosons, and to estimation of the resulting systematic error. The quantitative discussion is based on Monte Carlo programs PHOTOS and SANC, as well as on KKMC which is used for benchmark results. We show, that for a large classes of W and Z boson observables as used at LHC, theoretical error on photonic bremsstrahlung is 0.1 or 0.2%, depending on the program options used. An overall theoretical error on QED final state radiation, i.e. taking into account missing corrections due to pair emission and interference with initial state radiation is estimated respectively at 0.2% or 0.3% again depending on the program option used.
description: 1+28 pages, 20 figures
The contribution of the Warm-Hot Intergalactic Medium to the CMB anisotropies via the Sunyaev-Zeldovich effect
Creators: name: Suarez-Velásquez, I. F.
name: Mücket, J. P.
name: Atrio-Barandela, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Cosmological hydrodynamical simulations predict that a large fraction of all baryons reside within mildly non-linear structures with temperatures in the range $10^{5}-10^{7}$K. As the gas is highly ionized, it could be detected by the temperature anisotropies generated on the Cosmic Microwave Background radiation. We refine our previous estimates of the thermal Sunyaev-Zeldovich effect by introducing a non-polytropic equation of state to model the temperature distribution of the shock heated gas derived from temperature-density phase diagrams of different hydrodynamical simulations. Depending on the specific model, the Comptonization parameter varies in the range $10^{-7}\le y_c \le 2\times 10^{-6}$, compatible with the FIRAS upper limit. This amplitude is in agreement with a simple toy model constructed to estimate the average effect induced by filaments of ionized gas. Using the log-normal probability density function we calculate the correlation function and the power spectrum of the temperature anisotropies generated by the WHIM filaments. For a wide range of the parameter space, the maximum amplitude of the radiation power spectrum is $(\ell+1)\ell C_{\ell}/2π=0.7-70(μK)^2$ at $\ell \approx 200-500$. This amplitude scales with baryon density, Hubble constant and the amplitude of the matter power spectrum $σ_8$ as $[(\ell+1)\ell C_\ell]_{\mathrm{max}}/2π\propto σ_8^{2.6}(Ω_b h)^2$. Since the thermal Sunyaev-Zeldovich effect has a specific frequency dependence, we analyze the possibility of detecting this component with the forthcoming Planck data.
description: 7 pages, 7 figures, Accepted for publication in MNRAS
On $f$-bi-harmonic maps between Riemannian manifolds
Creators: name: Lu, Wei-Jun
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58E20, 53C12

description: Both bi-harmonic map and $f$-harmonic map have nice physical motivation and applications. In this paper, by combination of these two harmonic maps, we introduce and study $f$-bi-harmonic maps as the critical points of the $f$-bi-energy functional $\frac{1}{2}\int_M f|τ(ϕ)|^2dv_{g}$. This class of maps generalizes both concepts of harmonic maps and bi-harmonic maps. We first derive the $f$-biharmonic map equation and then use it to study $f$-bi-harmonicity of some special maps, including conformal maps between manifolds of same dimensions, some product maps between direct product manifold and singly warped product manifold, some projection maps from and some inclusion maps into a warped product manifold.
description: 30 pages
Coelosia Winnertz
Creators: name: Amorim, Dalton De Souza
name: Oliveira, Sarah Siqueira
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Coelosia

description: Coelosia Winnertz
 Coelosia Winnertz 1863: 96. Type-species, Boletina flava Staeger (Johannsen 1909: 86).
 C. flavithorax Freeman 1951: 64, fig. 285 (wing). Type-locality: Argentina, Río Negro, Lago Correntoso. Holotype ♂, NHM.
(Figure 61)
 Notes. The type series included the male holotype, one male and two female paratypes, of which the holotype, one male and one female paratypes are at the NHM. The labels of the holotype are: “ Coelosia / flavithorax [hw] / Freeman. / HOLOTYPE ” [printed on red label]” // [male terminalia on a microslide attached to a pinned plastic stripe]” // “HOLO- / TYPE” [printed in black on a rounded label with red border]” // “Lago Gutierrez. / 3– 14.xi.1926.” // “ Argentina: / Prov. Río Negro. / F. & M. Edwards / B.M. 1927–63.” // “BMNH(E) # / 253806”. The male paratype has the terminalia mounted on an acetate sheet and one paratype has the abdomen missing, supposedly one of the female paratypes. The paratypes are numbered BMNH(E) # 253807-8.
description: Published as part of Amorim, Dalton De Souza & Oliveira, Sarah Siqueira, 2013, Types of Neotropical Mycetophilidae (Diptera) at the Natural History Museum collection, London, pp. 1-119 in Zootaxa 3726 (1) on page 26, DOI: 10.11646/zootaxa.3726.1.1, http://zenodo.org/record/5267220
Automating ATLAS Computing Operations using the Site Status Board
Creators: name: Andreeva, Julia
name: Iglesias, Carlos Borrego
name: Campana, Simone
name: Di Girolamo, Alessandro
name: Dzhunov, Ivan
name: Curull, Xavier Espinal
name: Gayazov, Stavro
name: Magradze, Erekle
name: Nowotka, Michal Maciej
name: Rinaldi, Lorenzo
name: Saiz, Pablo
name: Schovancova, Jaroslava
name: Stewart, Graeme Andrew
name: Wright, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The automation of operations is essential to reduce manpower costs and improve the reliability of the system. The Site Status Board (SSB) is a framework which allows Virtual Organizations to monitor their computing activities at distributed sites and to evaluate site performance. The ATLAS experiment intensively uses the SSB for the distributed computing shifts, for estimating data processing and data transfer efficiencies at a particular site, and for implementing automatic exclusion of sites from computing activities, in case of potential problems. The ATLAS SSB provides a real-time aggregated monitoring view and keeps the history of the monitoring metrics. Based on this history, usability of a site from the perspective of ATLAS is calculated. The paper will describe how the SSB is integrated in the ATLAS operations and computing infrastructure and will cover implementation details of the ATLAS SSB sensors and alarm system, based on the information in the SSB. It will demonstrate the positive impact of the use of the SSB on the overall performance of ATLAS computing activities and will overview future plans.
description: The paper has been withdrawn by the author