cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: The effect of non-inversion tillage on farmland birds, soil and surface-active invertebrates and surface seeds
Creators: name: Cunningham, Heidi Margaret
Publisher: name: The Open University
Year: 2005

description: This thesis investigated the effect of non-inversion tillage (NIT) compared to conventional tillage (CT) on farmland birds and their invertebrate and seed food resources. Farmland birds have suffered severe population and range declines over the last few decades. One major reason is the increased intensification of agriculture leading to a decline in the abundance and availability of food over the summer and winter months. Conventional farming systems have traditionally used a mouldboard plough (CT) to invert the soil to prepare the seedbed for crop establishment. Due to economic pressures and increasing interest in environmental and soil protection, approximately 30% of arable crops in the UK are established by NIT methods. Machinery involved in NIT generally involves the use of discs and tines. Field occupancy by farmland birds was studied on commercial farms over three winters from 2000 to 2003. In addition, the abundance of seeds and earthworms were investigated during the autumn and spring (2001 - 2003) and surface-active arthropods during March and July (2002 - 2003). The study was carried out at fourteen farms in Oxfordshire, Leicestershire and Shropshire. Experimental work examined the effect of two types of NIT and mouldboard ploughing on the movement of weed and crop seeds in the autumn of 2003. Skylarks, other granivorous passerines and game birds occupied a greater proportion of cereal fields established by non-inversion tillage than conventional mouldboard ploughing. Tillage was not significant in explaining the variation in the relative abundance of carabid beetles, staphylinid beetles or spiders trapped in March, May or July. A greater relative abundance of beetle larvae were observed in conventionally tilled fields in July in wheat fields preceded by oil seed rape. Tillage was not significant in explaining the variation in seed or earthworm abundance or weights in the autumn or spring. The cultivation experiment showed few seeds retained at the soil surface after mouldboard ploughing compared to two NIT methods.
Asymptotic Flatness and Bondi Energy in Higher Dimensional Gravity
Creators: name: Hollands, Stefan
name: Ishibashi, Akihiro
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give a general geometric definition of asymptotic flatness at null infinity in $d$-dimensional general relativity ($d$ even) within the framework of conformal infinity. Our definition is arrived at via an analysis of linear perturbations near null infinity and shown to be stable under such perturbations. The detailed fall off properties of the perturbations, as well as the gauge conditions that need to be imposed to make the perturbations regular at infinity, are qualitatively different in higher dimensions; in particular, the decay rate of a radiating solution at null infinity differs from that of a static solution in higher dimensions. The definition of asymptotic flatness in higher dimensions consequently also differs qualitatively from that in $d=4$. We then derive an expression for the generator conjugate to an asymptotic time translation symmetry for asymptotically flat spacetimes in $d$-dimensional general relativity ($d$ even) within the Hamiltonian framework, making use especially of a formalism developed by Wald and Zoupas. This generator is given by an integral over a cross section at null infinity of a certain local expression and is taken to be the definition of the Bondi energy in $d$ dimensions. Our definition yields a manifestly positive flux of radiated energy. Our definitions and constructions fail in odd spacetime dimensions, essentially because the regularity properties of the metric at null infinity seem to be insufficient in that case. We also find that there is no direct analog of the well-known infinite set of angle dependent translational symmetries in more than 4 dimensions.
description: Latex, 41 pages, no figures. Revised version with 2 new appendices including a discussion of the BMS-group in higher dimensions
Atomistic perspective of long lifetimes of small skyrmions at room temperature
Creators: name: Hoffmann, Markus
name: Müller, Gideon P.
name: Blügel, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The current development to employ magnetic skyrmions in novel spintronic device designs has led to a demand for room temperature-stable skyrmions of ever smaller size. We present extensive studies on skyrmion stability in atomistic magnetic systems in two- and three-dimensional geometries. We show that for materials described by the same micromagnetic parameters, the variation of the atomistic exchange between different neighbors, the stacking order, and the number of layers of the atomic lattice can significantly influence the rate of the thermally activated decay of a skyrmion. These factors alone are important considerations, but it is shown that their combination can open up novel avenues of materials design in the search for sub-10nm skyrmions, as their lifetime can be extended by several orders of magnitude.
New supersymmetric AdS$_6$ black holes from matter-coupled F(4) gauged supergravity
Creators: name: Karndumri, Parinya
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study supersymmetric $AdS_6$ black holes from matter-coupled $N=(1,1)$ gauged supergravity coupled to three vector multiplets and $SO(3)\times SO(3)$ gauge group. This gauged supergravity admits two supersymmetric $AdS_6$ vacua preserving all supersymmetries with $SO(3)\times SO(3)$ and $SO(3)_{\textrm{diag}}$ symmetries. By considering a truncation to $SO(2)_{\textrm{diag}}\subset SO(3)_{\textrm{diag}}$ invariant sector, we find a number of new supersymmetric $AdS_2\times \mathcal{M}_4$ solutions by performing a topological twist along $\mathcal{M}_4$. For $\mathcal{M}_4$ being a product of two Riemann surfaces $Σ\times \widetildeΣ$ and a Kahler four-cycle, the twist is implemented by $SO(2)_{\textrm{diag}}$ gauge field while, for $\mathcal{M}_4$ given by a Cayley four-cycle, the twist is performed by turning on $SO(3)_{\textrm{diag}}$ gauge fields. We give numerical black hole solutions interpolating between $AdS_2\times \mathcal{M}_4$ near horizon geometries and asymptotically locally $AdS_6$ vacua. Among these solutions, there are solutions interpolating between both of the supersymmetric $AdS_6$ vacua and near horizon geometries. The solutions can also be interpreted as holographic RG flows from five-dimensional SCFTs to superconformal quantum mechanics.
description: 31 pages, 5 figures, typos corrected, more information added
Falsification of Cyber-Physical Systems with Robustness-Guided Black-Box Checking
Creators: name: Waga, Masaki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: For exhaustive formal verification, industrial-scale cyber-physical systems (CPSs) are often too large and complex, and lightweight alternatives (e.g., monitoring and testing) have attracted the attention of both industrial practitioners and academic researchers. Falsification is one popular testing method of CPSs utilizing stochastic optimization. In state-of-the-art falsification methods, the result of the previous falsification trials is discarded, and we always try to falsify without any prior knowledge. To concisely memorize such prior information on the CPS model and exploit it, we employ Black-box checking (BBC), which is a combination of automata learning and model checking. Moreover, we enhance BBC using the robust semantics of STL formulas, which is the essential gadget in falsification. Our experiment results suggest that our robustness-guided BBC outperforms a state-of-the-art falsification tool.
description: Accepted to HSCC 2020
Properties of Conjugate Channels with Applications to Additivity and Multiplicativity
Creators: name: King, Christopher
name: Matsumoto, Keiji
name: Nathanson, Michael
name: Ruskai, Mary Beth
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum channels can be described via a unitary coupling of system and environment, followed by a trace over the environment state space. Taking the trace instead over the system state space produces a different mapping which we call the conjugate channel. We explore the properties of conjugate channels and describe several different methods of construction. In general, conjugate channels map M_d to M_d' with d < d', and different constructions may differ by conjugation with a partial isometry. We show that a channel and its conjugate have the same minimal output entropy and maximal output p-norm. It then follows that the additivity and multiplicativity conjectures for these measures of optimal output purity hold for a product of channels if and only if they also hold for the product of their conjugates. This allows us to reduce these conjectures to the special case of maps taking M_d to M_d' with a minimal representation of dimension at most d. We find explicit expressions for the conjugates for a number of well-known examples, including entanglement-breaking channels, unital qubit channels, the depolarizing channel, and a subclass of random unitary channels. For the entanglement-breaking channels, channels this yields a new class of channels for which additivity and multiplicativity of optimal output purity can be established. For random unitary channels using the generalized Pauli matrices, we obtain a new formulation of the multiplicativity conjecture. The conjugate of the completely noisy channel plays a special role and suggests a mechanism for using noise to transmit information.
description: Final version to appear in Markov Processes and Related Fields special issue in memory of John T. Lewis
The Einstein Dual Theory of Relativity
Creators: name: Gill, Tepper L.
name: de Parga, Gonzalo Ares
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: {This paper is a comparison of the Minkowski, Einstein and Einstein dual theories of relativity. The dual is based on an identity relating the observer time and the proper time as a contact transformation on configuration space, which leaves phase space invariant. The theory is dual in that, for a system of $n$ particles, any inertial observer has two unique sets of global variables $({\bf{X}}, t)$ and $({\bf{X}}, τ)$ to describe the dynamics. Where ${\bf{X}}$ is the (unique) canonical center of mass. In the $({\bf{X}}, t)$ variables, time is relative and the speed of light is unique, while in the $({\bf{X}}, τ)$ variables, time is unique and the speed of light is relative with no upper bound. The two sets of particle and Maxwell field equations are mathematically equivalent, but the particle wave equations are not. The dual version contains an additional longitudinal radiation term that appears instantaneously with acceleration, does not depend on the nature of the force and the Wheeler-Feynman absorption hypothesis is a corollary. The homogenous and isotropic nature of the universe is sufficient to prove that a unique definition of Newtonian time exists with zero set at the big bang. The isotopic dual of $\R$ is used to improve the big bang model, by providing an explanation for the lack of antimatter in our universe, a natural arrow for time, conservation of energy, momentum and angular momentum. This also solves the flatness and horizon problems without inflation. We predict that radiation from a betatron (of any frequency) will not produce photoelectrons, that matter and antimatter are gravitationally repulsive and that data from distant sources does not have a unique physical interpretation. We provide a table showing the differences between the Minkowski, Einstein and dual versions of the special theory.}
Additional file 1 of EHEC O111:H8 strain and norovirus GII.4 Sydney [P16] causing an outbreak in a daycare center, Brazil, 2019
Creators: name: Spano, Liliana Cruz
name: Guerrieri, Caroline Gastaldi
name: Lays Paula Bondi Volpini
name: Schuenck, Ricardo Pinto
name: Goulart, Jaqueline Pegoretti
name: Boina, Elizabeth
name: Recco, Celia Regina Nascimento
name: Ribeiro-Rodrigues, Rodrigo
name: Santos, Luís Fernando Dos
name: Fumian, Tulio Machado
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 1.
Dark Energy Constraints from the Cosmic Age and Supernova
Creators: name: Feng, Bo
name: Wang, Xiulian
name: Zhang, Xinmin
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the low limit of cosmic ages from globular cluster and the white dwarfs: $t_0 > 12$Gyr, together with recent new high redshift supernova observations from the HST/GOODS program and previous supernova data, we give a considerable estimation of the equation of state for dark energy, with uniform priors as weak as $0.2
description: References added; Version to appear in Physics Letters B
Lithium Abundances of the Local Thin Disk Stars
Creators: name: Lambert, David L.
name: Reddy, Bacham E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Lithium abundances are presented for a sample of 181 nearby F and G dwarfs with accurate {\it Hipparcos} parallaxes. The stars are on circular orbits about the Galactic centre and, hence, are identified as belonging to the thin disk. This sample is combined with two published surveys to provide a catalogue of lithium abundances, metallicities ([Fe/H]), masses, and ages for 451 F-G dwarfs, almost all belonging to the thin disk. The lithium abundances are compared and contrasted with published lithium abundances for F and G stars in local open clusters. The field stars span a larger range in [Fe/H] than the clusters for which [Fe/H] $\simeq 0.0\pm0.2$. The initial (i.e., interstellar) lithium abundance of the solar neighborhood, as derived from stars for which astration of lithium is believed to be unimportant, is traced from $\logε$(Li) = 2.2 at [Fe/H] = -1 to $\logε$(Li) = 3.2 at $+0.1$. This form for the evolution is dependent on the assumption that astration of lit hium is negligible for the stars defining the relation. An argument is advanced that this latter assumption may not be entirely correct, and, the evolution of lithium with [Fe/H] may be flatter than previously supposed. A sharp Hyades-like Li-dip is not seen among the field stars and appears to be replaced by a large spread among lithium abundances of stars more massive than the lower mass limit of the dip. Astration of lithium by stars of masses too low to participate in the Li-dip is discussed. These stars show little to no spread in lithium abundance at a given [Fe/H] and mass.
description: Accepted for publication in MNRAS, 13 pages including 4 figures
Bose-Einstein condensation of trapped atoms with dipole interactions
Creators: name: Nho, Kwangsik
name: Landau, D. P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The path integral Monte Carlo method is used to simulate dilute trapped Bose gases and to investigate the equilibrium properties at finite temperatures. The quantum particles have a long-range dipole-dipole interaction and a short-range s-wave interaction. Using an anisotropic pseudopotential for the long-range dipolar interaction and a hard-sphere potential for the short-range s-wave interaction, we calculate the energetics and structural properties as a function of temperature and the number of particles. Also, in order to determine the effects of dipole-dipole forces and the influence of the trapping field on the dipolar condensate, we use two cylindrically symmetric harmonic confinements (a cigar-shaped trap and a disk-shaped trap). We find that the net effect of dipole-dipole interactions is governed by the trapping geometry. For a cigar-shaped trap, the net contribution of dipolar interactions is attractive and the shrinking of the density profiles is observed. For a disk-shaped trap, the net effect of long-range dipolar forces is repulsive and the density profiles expand.
Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
Creators: name: Sirica, N
name: Orth, P. P.
name: Scheurer, M. S.
name: Dai, Y. M.
name: Lee, M. -C.
name: Padmanabhan, P.
name: Mix, L. T.
name: Teitelbaum, S. W.
name: Trigo, M.
name: Zhao, L. X.
name: Chen, G. F.
name: Xu, B.
name: Yang, R.
name: Shen, B.
name: Hu, C.
name: Lee, C. -C.
name: Lin, H.
name: Cochran, T. A.
name: Trugman, S. A.
name: Zhu, J. -X.
name: Hasan, M. Z.
name: Ni, N.
name: Qiu, X. G.
name: Taylor, A. J.
name: Yarotski, D. A.
name: Prasankumar, R. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Symmetry plays a central role in conventional and topological phases of matter, making the ability to optically drive symmetry change a critical step in developing future technologies that rely on such control. Topological materials, like the newly discovered topological semimetals, are particularly sensitive to a breaking or restoring of time-reversal and crystalline symmetries, which affect both bulk and surface electronic states. While previous studies have focused on controlling symmetry via coupling to the crystal lattice, we demonstrate here an all-electronic mechanism based on photocurrent generation. Using second-harmonic generation spectroscopy as a sensitive probe of symmetry change, we observe an ultrafast breaking of time-reversal and spatial symmetries following femtosecond optical excitation in the prototypical type-I Weyl semimetal TaAs. Our results show that optically driven photocurrents can be tailored to explicitly break electronic symmetry in a generic fashion, opening up the possibility of driving phase transitions between symmetry-protected states on ultrafast time scales.
description: 28 pages, 15 figures, 4 Tables
Comment to: "Noncovalent functionalization of carbon nanotubes by aromatic organic molecules" [ Appl. Phys. Lett. 82, 3746 (2003) ]
Creators: name: Giannozzi, P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The weak-chemisorption/charge-transfer picture for adsorption of aromatic molecules over carbon nanotubes, proposed in the commented paper, is criticized.
description: 1.5 pages, 1 figure, submitted to APL
Immirzi Ambiguity, Boosts and Conformal Frames for Black Holes
Creators: name: Garay, Luis J.
name: Marugan, Guillermo A. Mena
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black hole physics. We show that the effective value deduced for the Planck length in local measurements of vacuum black holes by an asymptotic observer may depend on its conformal or Lorentz frame. This introduces an apparent ambiguity in the expression of the black hole entropy which is analogous to that produced by the Immirzi parameter. For quantities involving a notion of energy, the similarity between the implications of the Immirzi ambiguity and a conformal scaling disappears, but the parallelism with boosts is maintained.
description: 8 pages, accepted for publication in Classical and Quantum Gravity
Nodal Semimetals: A Survey on Optical Conductivity
Creators: name: Pronin, A. V.
name: Dressel, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Among different topological and related phases of condensed matter, nodal semimetals occupy a special place - the electronic band topology in these materials is related to three-dimensional bulk, rather than to surface, states. A great variety of different realizations of electronic band crossings (the nodes) leads to a plethora of different electronic properties, ranging from the chiral anomaly to solid-state realizations of a black-hole horizon. The different nodal phases have similar low-energy band structure and quasiparticle dynamics, which both can be accessed experimentally by a number of methods. Optical measurements with their large penetration depth and high energy resolution are ideally suited as such a bulk probe; especially at low energies where other spectroscopic methods often lack the required resolution. In this contribution, we review recent optical-conductivity studies of different nodal semimetals, discuss possible limitations of such measurements, and provide a comparison between the experimental results, simple theoretical models, and band-structure-based calculations.
description: to appear in a special issue of pss(b) on topological materials
Determining Cosmological Constant Using Gravitational Wave Information
Creators: name: Wilson, Thomas L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: It is shown in Einstein gravity that the cosmological constant Lambda introduces a graviton mass m into the theory, a result that will be derived from the Regge-Wheeler-Zerilli problem for a particle falling onto a Kottler-Schwarzschild mass with Lambda. The value of m is precisely the Spin-2 gauge line appearing on the Lambda versus m2 phase diagram for Spin-2, the partially massless gauge lines introduced by Deser & Waldron and described as the Higuchi bound. Note that this graviton is unitary with only four polarization degrees of freedom (helicities plus & minus 2 and 1, but not 0 because a scalar gauge symmetry removes it). The conclusion is drawn that Einstein gravity (with Lambda) is a partially massless gravitation theory which has lost its helicity 0 due to a scalar gauge symmetry. That poses a challenge for gravitational wave antennas as to whether they can measure the loss of this gauge symmetry. Also, given the recent results measuring the Hubble constant Ho from LIGO-Virgo data, it is then shown that Lambda can be determined from the LIGO results for the graviton mass m and Ho. This is yet another multi-messenger source for determining the three parameters Lambda, m, and Ho in astrophysics and cosmology, at a time when there is much disparity in measurements of Ho.
description: 4 pages, No figures
Morphology and evolution of emission line galaxies in the Hubble Ultra Deep Field
Creators: name: Pirzkal, N.
name: Xu, C.
name: Ferreras, I.
name: Malhotra, S.
name: Mobasher, B.
name: Rhoads, J.
name: Pasquali, A.
name: Panagia, N.
name: Koekemoer, A. M.
name: Ferguson, H. C.
name: Gronwall, C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the properties and evolution of a sample of galaxies selected to have prominent emission lines in low-resolution grism spectra of the Hubble Ultra Deep Field (HUDF). These objects, eGRAPES, are late type blue galaxies, characterized by small proper sizes (R_50 < 2 kpc) in the 4350A rest-frame, low masses (5x10^9 M_sun), and a wide range of luminosities and surface brightnesses. The masses, sizes and volume densities of these objects appear to change very little up to a redshift of z=1.5. On the other hand, their surface brightness decreases significantly from z=1.5 to z=0 while their mass-to-light ratio increases two-folds. This could be a sign that most of low redshift eGRAPES have an older stellar population than high redshift eGRAPES and hence that most eGRAPES formed at higher redshifts. The average volume density of eGRAPES is (1.8 \pm 0.3)x10^{-3} Mpc^{-3} between 0.3 < z < 1.5. Many eGRAPES would formally have been classified as Luminous Compact Blue Galaxies (LCBGs) if these had been selected based on small physical size, blue intrinsic color, and high surface brightness, while the remainder of the sample discussed in this paper forms an extension of LCBGs towards fainter luminosities.
description: Accepted, to appear in Apj
GERMOPLASMA DE ARACEAS COMESTIBLES EN COLOMBIA
Creators: name: Gómez Arias, Nelson
name: Gómez Arias, Nelson
Publisher: name: Unknown
Year: 1983
Subjects: Crop Production/Industries
Research and Development/Tech Change/Emerging Technologies

description: The Germoplasm Banks are collections of both native genetic material and foreign genetic material. They are useful for enhancing and improving the genetic source in order to obtain better hybrids and varieties. The edible aroids are a small but important group of plants. There are five genus: Alocasia, Amorphophallus, Colocasia, Cytosperma and Xanthosoma. The Xanthosoma has special importance because it is native of tropical America and it shows good yield, adaptation and resistance. Sixty two Xanthosoma clones, thirty six Colocasia clones and six Alocasia clones were collected in several Colombian regions. Due to its broad availability, adaptation and ample consumption, the Xanthosoma is the more important of the five genus. Among the fifty two Xanthosoma clones collected the more important are the white clone known as "Yautia", the violet clone known as "Mafafa" and a giant clone known as "Bore" which has an edible pseudo-stem. The Colocasia clones are very important for human consumption along the Colombian Pacific Coast, which presents a tropical weather with very heavy precipitation (7,500 mm/year). The Alocasia clones are important only as ornanental plants. Because in most of the aroids clones there exists a high genetic erosion caused by human, it is urgent to rescue the germoplasmatic material by more extensive exploration. At the same time, it is necessary to better define the taxonomy of the Colombian clones. Six clones have not been identified.
The Bubble Algebra: Structure of a Two-Colour Temperley-Lieb Algebra
Creators: name: Grimm, Uwe
name: Martin, Paul P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Rings and Algebras (math.RA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81R12; 82B20; 82B23

description: We define new diagram algebras providing a sequence of multiparameter generalisations of the Temperley-Lieb algebra, suitable for the modelling of dilute lattice systems of two-dimensional Statistical Mechanics. These algebras give a rigorous foundation to the various "multi-colour algebras" of Grimm, Pearce and others. We determine the generic representation theory of the simplest of these algebras, and locate the nongeneric cases (at roots of unity of the corresponding parameters). We show by this example how the method used (Martin's general procedure for diagram algebras) may be applied to a wide variety of such algebras occurring in Statistical Mechanics. We demonstrate how these algebras may be used to solve the Yang-Baxter equations.
description: 24 pages, LaTeX using IOP styles, many figures included; typo in formula (7) corrected
Experimental identification of the $T = 1$, $J^π = 6^+$ state of $^{54}$Co and isospin symmetry in $A = 54$ studied via one-nucleon knockout reactions
Creators: name: Spieker, M.
name: Weisshaar, D.
name: Gade, A.
name: Brown, B. A.
name: Adrich, P.
name: Bazin, D.
name: Bentley, M. A.
name: Brown, J. R.
name: Campbell, C. M.
name: Diget, C. Aa.
name: Elman, B.
name: Glasmacher, T.
name: Hill, M.
name: Longfellow, B.
name: Pritychenko, B.
name: Ratkiewicz, A.
name: Rhodes, D.
name: Tostevin, J. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: New experimental data obtained from $γ$-ray tagged one-neutron and one-proton knockout from $^{55}$Co is presented. A candidate for the sought-after $T=1, T_z = 0, J^π = 6^+$ state in $^{54}$Co is proposed based on a comparison to the new data on $^{54}$Fe, the corresponding observables predicted by large-scale-shell-model (LSSM) calculations in the full $fp$-model space employing charge-dependent contributions, and isospin-symmetry arguments. Furthermore, possible isospin-symmetry breaking in the $A=54$, $T=1$ triplet is studied by calculating the experimental $c$ coefficients of the isobaric mass multiplet equation (IMME) up to the maximum possible spin $J=6$ expected for the $(1f_{7/2})^{-2}$ two-hole configuration relative to the doubly-magic nucleus $^{56}$Ni. The experimental quantities are compared to the theoretically predicted $c$ coefficients from LSSM calculations using two-body matrix elements obtained from a realistic chiral effective field theory potential at next-to-next-to-next-to-leading order (N$^3$LO).
description: 6 pages, 5 figures. Work has been published
On the Evolution of Time Horizons in Parallel and Grid Simulations
Creators: name: Shchur, L. N.
name: Novotny, M. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We analyze the evolution of the local simulation times (LST) in Parallel Discrete Event Simulations. The new ingredients introduced are i) we associate the LST with the nodes and not with the processing elements, and 2) we propose to minimize the exchange of information between different processing elements by freezing the LST on the boundaries between processing elements for some time of processing and then releasing them by a wide-stream memory exchange between processing elements. Highlights of our approach are i) it keeps the highest level of processor time utilization during the algorithm evolution, ii) it takes a reasonable time for the memory exchange excluding the time-consuming and complicated process of message exchange between processors, and iii) the communication between processors is decoupled from the calculations performed on a processor. The effectiveness of our algorithm grows with the number of nodes (or threads). This algorithm should be applicable for any parallel simulation with short-range interactions, including parallel or grid simulations of partial differential equations.
description: 24 pages with 11 figures
title: What About The Third-Agers?: A Study Of Participation In Informal/Non-Formal Learning By Older Adults
Creators: name: Vulkan, Eleanor Mary
Publisher: name: The Open University
Year: 2004

description: Set in the context of an ageing population where longevity is often presented as a problem, this study aims to examine the participation of 60 - 90 year-olds in learning outside the formal sector and to contest the prevailing negative image of older people as non-participants in education. A survey of the literature illustrates the ageist attitudes prevalent amongst some educationalists and demonstrates how older people are often marginalized from the social and economic process, not necessarily by active discrimination but more by oversight and omission, their educational needs being largely ignored. The research seeks to understand the meanings older people give to education and to illuminate the processes by which some, even if only a few, come to learning in later life. Calling for the inclusion of older learners in educational provision, the Carnegie Inquiry into the Third Age (1993) hinted that learning in a social context, with participants involved in planning their own learning, was a constructive way forward for this age group. A life history approach is used to compile learning biographies of twelve members of a self-help educational organisation, the University of the Third Age. Tracing the routes that have brought these people to learning in later life, the study examines their motivations to learn at different life stages and demonstrates how decisions to participate or not participate are conditioned by a complex interplay of reactions to social, cultural and historical events. Many of the current generation of older people constructed their lives against a background of limited initial education, economic depression and the disruptions of a world war, all factors which would seem to predict nonparticipation in learning. Yet many thousands of this generation are participants. The study examines the role of learning in the lives of older people and seeks to understand their reasons for choosing to participate in a specific type of informal or non-formal learning where participants take responsibility for their own learning.
Relic density and elastic scattering cross sections of the neutralino in the MSSM with CP-violating phases
Creators: name: Nihei, Takeshi
name: Sasagawa, Masaki
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the neutralino relic density and the neutralino-proton elastic scattering cross sections in the minimal supersymmetric standard model (MSSM) with CP-violating phases. We include all the final states to the neutralino pair annihilation cross section at the tree level, taking into account the mixing between the CP-even and CP-odd neutral Higgs fields. We show that variations of the relic density and the elastic scattering cross sections with the CP-violating phases are significant. In particular, interferences between the major contributions in the neutralino annihilation cross section can cause considerable enhancement of the relic density.
description: LaTeX, 25 pages, 8 eps figures
Optimization of Turbine Tilt in a Wind Farm
Creators: name: Cutler, James
Publisher: name: figshare
Year: 2020
Subjects: subject: 90608 Renewable Power and Energy Systems Engineering (excl. Solar Cells)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Wind farms are severely affected by negative wake interactions between turbines. By optimizing the tilt angle of the turbines in a farm, wakes may be deflected away from downstream turbines, increasing the overall energy production. In this study, we will optimize the tilt angle of turbines in a wind farm to maximize energy production. We will use an analytic wake model modified to consider wake deflection from tilt, and gradient-based optimization. We will consider optimizing the tilt angle of each turbine assuming that it will remain fixed for the lifetime of the farm. We will also consider active tilt control. Preliminary results with optimization of the Princess Amalia Wind Farm show about an 11% increase in the annual energy production. Although these preliminary results only consider one wind farm we expect that considering other wind farms will still result in significant gains.
Measuring Dwarf Galaxy Intrinsic Abundance Scatter with Mid-resolution Spectroscopic Surveys: Calibrating APOGEE Abundance Errors
Creators: name: Mead, Jennifer
name: Ness, Melissa
name: Andersson, Eric
name: Griffith, Emily J.
name: Horta, Danny
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The first generations of stars left their chemical fingerprints on metal-poor stars in the Milky Way and its surrounding dwarf galaxies. While instantaneous and homogeneous enrichment implies that groups of co-natal stars should have the same element abundances, small amplitudes of abundance scatter are seen at fixed [Fe/H]. Measurements of intrinsic abundance scatter have been made with small, high-resolution spectroscopic datasets where measurement uncertainty is small compared to this scatter. In this work, we present a method to use mid-resolution survey data, which has larger errors, to make this measurement. Using APOGEE DR17, we calculate the intrinsic scatter of Al, O, Mg, Si, Ti, Ni, and Mn relative to Fe for 333 metal-poor stars across 6 classical dwarf galaxies around the Milky Way, and 1604 stars across 19 globular clusters. We first calibrate the reported abundance errors in bins of signal-to-noise and [Fe/H] using a high-fidelity halo dataset. We then apply these calibrated errors to the APOGEE data, and find small amplitudes of average intrinsic abundance scatter in dwarf galaxies ranging from 0.032 - 0.14 dex with a median value of 0.043 dex. For the globular clusters, we find intrinsic scatters ranging from 0.018 - 0.21 dex, with particularly high scatter for Al and O. Our measurements of intrinsic abundance scatter place important upper limits on the intrinsic scatter in these systems, as well as constraints on their underlying star formation history and mixing, that we can look to simulations to interpret.
description: 16 pages, 10 figures, 3 tables, this version accepted to ApJ, final version published in ApJ Oct 11
Polarization spectroscopy in rubidium and cesium
Creators: name: Harris, M. L.
name: Adams, C. S.
name: Cornish, S. L.
name: McLeod, I. C.
name: Tarleton, E.
name: Hughes, I. G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We develop a theoretical treatment of polarization spectroscopy and use it to make predictions about the general form of polarization spectra in the alkali atoms. Using our model, we generate theoretical spectra for the D2 transitions in 87Rb, 85Rb, and 133Cs. Experiments demonstrate that the model accurately reproduces spectra of transitions from the upper hyperfine level of the ground state only. Among these, the closed transition F -> F' = F + 1 dominates, with a steep gradient through line center ideally suited for use as a reference in laser locking.
description: 8 pages, 5 figures, to be published in Phys. Rev. A; figures and discussion added
Black Hole Accretion Disks On The Edge
Creators: name: Menou, Kristen
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The local axisymmetric stability of hydrodynamical and magnetized, nearly-Keplerian gaseous accretion disks around non-rotating black holes is examined in the vicinity of the classical marginally-stable orbit (at radii ~ R_ms). An approximate Paczynski-Wiita pseudo-Newtonian potential is used. Hydrodynamical disks are linearly unstable inside a radius which differs slightly from the classical R_ms value because of finite pressure and radial stratification effects. Linear stresses associated with unstable hydrodynamical modes vanish exactly at the radius of marginal stability and are generally positive inside of that radius. When a magnetic field is introduced, however, the concept of radius of marginal stability becomes largely irrelevant because there are linearly unstable magneto-rotational modes everywhere. Associated linear stresses are positive and continuous across the region of hydrodynamical marginal stability, even for large-scale "hydro-like" modes subject only to weak magnetic tension. This conclusion is valid for arbitrarily thin disks (in ideal MHD) and it does not require a large-scale "radially-connecting" magnetic field. Results on hydrodynamical diskoseismic modes trapped in deep relativistic potential wells should be revised to account for the short-wavelength Alfven-like behavior of inertio-gravity waves in magnetized disks.
description: 17 pages, 4 figures, accepted for publication in ApJ
Extended lens reconstructions with Grale: exploiting time domain, substructural and weak-lensing information
Creators: name: Liesenborgs, Jori
name: Williams, Liliya L. R.
name: Wagner, Jenny
name: De Rijcke, Sven
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The information about the mass density of galaxy clusters provided by the gravitational lens effect has inspired many inversion techniques. In this article, updates to the previously introduced method in Grale are described, and explored in a number of examples. The first looks into a different way of incorporating time delay information, not requiring the unknown source position. It is found that this avoids a possible bias that leads to "over-focusing" the images, i.e. providing source position estimates that lie in a considerably smaller region than the true positions. The second is inspired by previous reconstructions of the cluster of galaxies MACS J1149.6+2223, where a multiply-imaged background galaxy contained a supernova, SN Refsdal, of which four additional images were produced by the presence of a smaller cluster galaxy. The inversion for the cluster as a whole, was not able to recover sufficient detail interior to this quad. We show how constraints on such different scales, from the entire cluster to a single member galaxy, can now be used, allowing such small scale substructures to be resolved. Finally, the addition of weak lensing information to this method is investigated. While this clearly helps recover the environment around the strong lensing region, the mass sheet degeneracy may make a full strong and weak inversion difficult, depending on the quality of the ellipticity information at hand. We encounter ring-like structure at the boundary of the two regimes, argued to be the result of combining strong and weak lensing constraints, possibly affected by degeneracies.
description: 24 pages, 19 figures, accepted for publication in MNRAS
Efficient Discrete Feature Encoding for Variational Quantum Classifier
Creators: name: Yano, Hiroshi
name: Suzuki, Yudai
name: Itoh, Kohei M.
name: Raymond, Rudy
name: Yamamoto, Naoki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent days have witnessed significant interests in applying quantum-enhanced techniques for solving a variety of machine learning tasks. Variational methods that use quantum resources of imperfect quantum devices with the help of classical computing techniques are popular for supervised learning. Variational quantum classification (VQC) is one of such methods with possible quantum advantage in using quantum-enhanced features that are hard to compute by classical methods. Its performance depends on the mapping of classical features into a quantum-enhanced feature space. Although there have been many quantum-mapping functions proposed so far, there is little discussion on efficient mapping of discrete features, such as age group, zip code, and others, which are often significant for classifying datasets of interest. We first introduce the use of quantum random-access coding (QRAC) to map such discrete features efficiently into limited number of qubits for VQC. In numerical simulations, we present a range of encoding strategies and demonstrate their limitations and capabilities. We experimentally show that QRAC can help speeding up the training of VQC by reducing its parameters via saving on the number of qubits for the mapping. We confirm the effectiveness of the QRAC in VQC by experimenting on classification of real-world datasets with both simulators and real quantum devices.
Elementarity and dimensions
Creators: name: Hart, Klaas Pieter
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 54F45; 03C30, 03C98, 54D30, 54D80

description: We give an alternative proof of Fedorchuk's recent result that dim X <= Dg X for compact Hausdorff spaces X. We use the Löwenheim-Skolem theorem to reduce the problem to the metric case.
Artikel Jurnal Keperawatan Muhammadiyah Bengkulu.pdf
Creators: name: Jurnal Keperawatan Muhammadiyah Bengkulu
Publisher: name: figshare
Year: 2020
Subjects: subject: 111099 Nursing not elsewhere classified
subject: FOS: Health sciences
subject: 130209 Medicine, Nursing and Health Curriculum and Pedagogy
subject: FOS: Educational sciences

description: urnal Keperawatan Muhammadiyah Bengkulu Is a Journal Managed by the Nursing Study Program at the Faculty of Health Science, Muhammadiyah Bengkulu University, containing reports of research result, about nursing , wich have never been published. Article manuscripts to be published are sent to email redaksijurnalkeperawatan@umb.ac.id or you can submit articles directly by first registering here. Jurnal Keperawatan Muhammadiyah Bengkulu published twice a year, namely April and October. Bengkulu Muhammadiyah Nursing Journal published through hardcopy (book form) and uploaded via the website: http://jurnal.umb.ac.id/index.php/keperawatan/. this journal has been registered for the print and online versions P ISSN 2460-4550, E ISSN 2720-958XThe topics to be published are topics related to nursing which include Surgical Medical Nursing, Critical Nursing, Child Nursing, Conscious Nursing, Maternity Nursing, Mental Nursing, Gerontik Nursing and community nursing and other health fields.
Localization lengths of ultrathin disordered gold and silver nanowires
Creators: name: Costa, A. T.
name: Muniz, R. B.
name: Hong, Jisang
name: Wu, R. Q.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The localization lengths of ultrathin disordered Au and Ag nanowires are estimated by calculating the wire conductances as functions of wire lengths. We study Ag and Au monoatomic linear chains, and thicker Ag wires with very small cross sections. For the monoatomic chains we consider two types of disorder: bounded random fluctuations of the interatomic distances, and the presence of random substitutional impurities. The effect of impurity atoms on the nanowire conductance is much stronger. Our results show that electrical transport in ultrathin disordered wires may occur in the strong localization regime, and with relatively small amounts of disorder the localization lengths may be rather small. The localization length dependence on wire thickness is investigated for Ag nanowires with different impurity concentrations.
description: 6 pages, postscript figures included, submitted to PRL