cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Goals and methods in art museum community outreach programs
Creators: name: Kharod, Keerti Upendra
Publisher: name: The University of Texas at Austin
Year: 2004
Subjects: Community outreach programs
Museum education
Program for Art Museums and Communities

description: The purpose of this research is to determine effective methods for meeting goals in art museum community outreach programs. The professionalization of museums has made it necessary for museum educators to be aware of goals, goal-setting, and strategies for achieving success. Museum staffs are also becoming more aware of their civic responsibility of representation and education in and for their surrounding communities. This study details the goals and methods of four museums that were part of the Program for Art Museums and Communities: The Isabella Stewart Gardner Museum, the Denver Art Museum, the Art Institute of Chicago, and the Museum of Contemporary Art, San Diego. Each museum demonstrated innovative programming and professional growth during their community programs, and also strengthened their bonds with their communities. This study concludes with recommendations from the museum educators. The recommendations provide insight into the process of art museum community outreach, and may serve as useful tools to other museum educators who wish to develop an effective community outreach program
Responding to the Coffee Crisis: What Can We Learn from Price Dynamics
Creators: name: Mehta, Aashish
name: Chavas, Jean-Paul
name: Mehta, Aashish
name: Chavas, Jean-Paul
Publisher: name: Unknown
Year: 2004
Subjects: Demand and Price Analysis

description: We develop a semi-structural price vector autoregression to capture coffee price dynamics over various time horizons. The presence of the International Coffee Agreement is permitted to alter supply responses to price signals through yield and planting effects. In the short run, the ICA caused Brazilian farm prices to become disconnected from international prices. In the long run, the ICA promoted supply response by providing a stable environment in which producers could use current price information to predict future prices. In the intermediate run, it muted supply response by necessitating an institutional price wedge between wholesale and farm level prices. In net, the ICA created a price cycle that does not exist in non-ICA periods. Oxfam's proposal to burn 300 million pounds of coffee will provide temporary relief to farmers, but cannot be used repeatedly as a long term strategy. The low coffee prices experienced since the disintegration of the ICA may be due to the interaction of supply lags, a shift in the composition of coffee demand, and low price response due to price uncertainty. No evidence of asymmetric price transmission is found.
Changes in Public Sector Employment with a Focus on Wisconsin 1993 to 2004
Creators: name: Deller, Steven C.
name: Maher, Craig
name: Deller, Steven C.
name: Maher, Craig
Publisher: name: Unknown
Year: 2006
Subjects: Labor and Human Capital

description: This study examines patterns of total employment growth and growth in the public sector. We use data from the 50 states with a focus on the 1993 to 2004 time period. We define the public sector with respect to state government as well as local government with the latter including counties, municipalities, K-12 public schools and special districts. We maintain that given the labor intensive nature of the public sector we can assess the size of the government by monitoring public sector employment. The results clearly suggest that Wisconsin's public sector, as measured by employment, is not "out of control" and growth in the public sector is a natural by-product of growth in the overall economy.
Event-Based Backpropagation can compute Exact Gradients for Spiking Neural Networks
Creators: name: Wunderlich, Timo C.
name: Pehle, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Spiking neural networks combine analog computation with event-based communication using discrete spikes. While the impressive advances of deep learning are enabled by training non-spiking artificial neural networks using the backpropagation algorithm, applying this algorithm to spiking networks was previously hindered by the existence of discrete spike events and discontinuities. For the first time, this work derives the backpropagation algorithm for a continuous-time spiking neural network and a general loss function by applying the adjoint method together with the proper partial derivative jumps, allowing for backpropagation through discrete spike events without approximations. This algorithm, EventProp, backpropagates errors at spike times in order to compute the exact gradient in an event-based, temporally and spatially sparse fashion. We use gradients computed via EventProp to train networks on the Yin-Yang and MNIST datasets using either a spike time or voltage based loss function and report competitive performance. Our work supports the rigorous study of gradient-based learning algorithms in spiking neural networks and provides insights toward their implementation in novel brain-inspired hardware.
Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets
Creators: name: Golosov, D. I.
name: Orgad, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We calculate the energy of a boundary between ferro- and antiferromagnetic regions in a phase separated double-exchange magnet in two and three dimensions. The orientation dependence of this energy can significantly affect the geometry of the phase-separated state in two dimensions, changing the droplet shape and possibly stabilizing a striped arrangement within a certain range of the model parameters. A similar effect, albeit weaker, is also present in three dimensions. As a result, a phase-separated system near the percolation threshold is expected to possess intrinsic hysteretic transport properties, relevant in the context of recent experimental findings.
description: 6 pages, including 4 figures; expanded version
Isorthoceras undefined-E
Creators: name: Kröger, Björn
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Orthocerida
Proteoceratidae
Isorthoceras
Isorthoceras undefined-E

description: Isorthoceras sp. E
Fig. 19E
Material examined
ESTONIA • 1 spec.; Vormsi Island, Saxby shore, Kõrgessaare Formation, Vormsi Regional Stage; GIT 426-1132.
Description
The specimen is a 110 mm long, 27–32 mm high fragment of a phragmocone (angle of expansion ca 4°) with 16 chambers preserved (RCL 0.21–0.31), and with a circular cross section. The outer shell is not preserved. The siphuncle is eccentric (RSP = 0.31) and, where preserved, with a straight, tubular connecting ring. The septal necks are short (ca 0.8 mm long) orthochoanitic-suborthochoanitic and shallow endosiphuncular annuli occur.
Remarks
This specimen is unique among the larger Isorthoceras fragments in having a combination of relatively low angle of expansion (comparable to I. luhai at similar conch heights) and a relatively eccentric siphuncle position (comparable to I. saaremense at similar conch heights). Additionally, the siphuncle is more tubular than compared to the other species of Isorthoceras known from Estonia, and shallow endosiphuncular deposits occur. More material is needed with external characters preserved to allow for a species level determination.
description: Published as part of Kröger, Björn, 2025, The Lyckholm acme of cephalopods - Review of the late Katian (Vormsi-Pirgu regional stages) Ordovician cephalopods of Estonia, pp. 1-169 in European Journal of Taxonomy 978 on pages 52-53, DOI: 10.5852/ejt.2025.978.2801, http://zenodo.org/record/14988376
Systematic improvement of molecular excited state calculations by inclusion of nuclear quantum motion: a mode-resolved picture and the effect of molecular size
Creators: name: Hele, Timothy J. H.
name: Monserrat, Bartomeu
name: Alvertis, Antonios M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The energies of molecular excited states arise as solutions to the electronic Schrödinger equation and are often compared to experiment. At the same time, nuclear quantum motion is known to be important and to induce a red-shift of excited state energies. However, it is thus far unclear whether incorporating nuclear quantum motion in molecular excited state calculations leads to a systematic improvement of their predictive accuracy, making further investigation necessary. Here we present such an investigation by employing two first-principles methods for capturing the effect of quantum fluctuations on excited state energies, which we apply to the Thiel set of organic molecules. We show that accounting for zero-point motion leads to much improved agreement with experiment, compared to `static' calculations which only account for electronic effects, and the magnitude of the red-shift can become as large as 1.36 eV. Moreover, we show that the effect of nuclear quantum motion on excited state energies largely depends on the molecular size, with smaller molecules exhibiting larger red-shifts. Our methodology also makes it possible to analyze the contribution of individual vibrational normal modes to the red-shift of excited state energies, and in several molecules we identify a limited number of modes dominating this effect. Overall, our study provides a foundation for systematically quantifying the shift of excited state energies due to nuclear quantum motion, and for understanding this effect at a microscopic level.
Glassy behavior of light
Creators: name: Angelani, L.
name: Conti, C.
name: Ruocco, G.
name: Zamponi, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the nonlinear dynamics of a multi-mode random laser using the methods of statistical physics of disordered systems. A replica-symmetry breaking phase transition is predicted as a function of the pump intensity. We thus show that light propagating in a random non-linear medium displays glassy behavior, i.e. the photon gas has a multitude of metastable states and a non vanishing complexity, corresponding to mode-locking processes in random lasers. The present work reveals the existence of new physical phenomena, and demonstrates how nonlinear optics and random lasers can be a benchmark for the modern theory of complex systems and glasses.
description: 5 pages, 1 figure
Magnetic inhibition of the recollimation instability in relativistic jets
Creators: name: Matsumoto, Jin
name: Komissarov, Serguei S.
name: Gourgouliatos, Konstantinos N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this paper, we describe the results of three-dimensional relativistic magnetohydrodynamic simulations aimed at probing the role of regular magnetic field on the development of the instability that accompanies recollimation of relativistic jets. In particular, we studied the recollimation driven by the reconfinement of jets from active galactic nuclei (AGN) by the thermal pressure of galactic coronas. We find that a relatively weak azimuthal magnetic field can completely suppress the recollimation instability in such jets, with the critical magnetisation parameter $σ_{cr} < 0.01$. We argue that the recollimation instability is a variant of the centrifugal instability (CFI) and show that our results are consistent with the predictions based on the study of magnetic CFI in rotating fluids. The results are discussed in the context of AGN jets in general and the nature of the Fanaroff-Riley morphological division of extragalactic radio sources in particular.
description: 12 pages, 8 figures, accepted for publication in MNRAS
RESOURCE USE IN SYSTEMS OF INTENSIVE ANIMAL PRODUCTION
Creators: name: Welsch, Delane E.
name: Welsch, Delane E.
Publisher: name: Unknown
Year: 1973
Subjects: Livestock Production/Industries

description: The purpose of this paper is to describe several alternative mixes of resources used in animal production, explain why they came about, and question their appropriateness. My main thesis is that capital-intensive systems, although not inherently good or bad, have social and economic consequences for a country that may be either very good or very bad.
Schütte, Heinz: Amt, Ordination und Sukzession im Verständnis evangelischer und katholischer Exegeten und Dogmatiker der Gegenwart sowie in Dokumenten ökumenischer Gespräche
Creators: name: Herbert, Karl
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 24 Nr. 1 (1975): Ökumenische Rundschau, Band 24, Heft 1
Deliverable 2.2 Report on overview of needs, barriers and enablers for policies and governance of EU food systems and FNS R&I
Creators: name: Biondi, Beatrice
name: Mazzocchi, Mario
name: Pontillo, Chiara
Publisher: name: Zenodo
Year: 2019
Subjects: FIT4FOOD2030
Dissemination
Responsible Research and Innovation
Food and Nutrition Security
FOOD2030EU
Food system transformation
Tools for transformation

description: This report accompanies an electronic database of policies, which is currently provided separately as an Excel file. The excel file provides an up-to-date mapping of current EU and national policies influencing the food system in Europe and how they relate to Food and Nutrition Security Research & Innovation (FNS R&I) policy implementation. The aim of this database goes beyond the mere listing of food policies and provides a classification of policies in terms of goals, targets and instruments, which represents an essential information to support the identification of gaps and priorities, and promote discussion within multisectoral or multiministerial collaboration efforts, like those established in the FIT4FOOD2030 Policy labs and City Labs.
Topological charge, spin and heat transistor
Creators: name: Becerra, V. Fernández
name: Trif, Mircea
name: Hyart, Timo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Spin pumping consists in the injection of spin currents into a non-magnetic material due to the precession of an adjacent ferromagnet. In addition to the pumping of spin the precession always leads to pumping of heat, but in the presence of spin-orbital entanglement it also leads to a charge current. We investigate the pumping of charge, spin and heat in a device where a superconductor and a quantum spin Hall insulator are in proximity contact with a ferromagnetic insulator. We show that the device supports two robust operation regimes arising from topological effects. In one regime, the pumped charge, spin and heat are quantized and related to each other due to a topological winding number of the reflection coefficient in the scattering matrix formalism -- translating to a Chern number in the case of Hamiltonian formalism. In the second regime, a Majorana zero mode switches off the pumping of currents owing to the topologically protected perfect Andreev reflection. We show that the interplay of these two topological effects can be utilized so that the device operates as a robust charge, spin and heat transistor.
description: Final accepted version
A water-soluble phosphate-footed cavitand : synthesis and binding properties with small neutral organic molecules
Creators: name: Gui, Xuan
Publisher: name: University of British Columbia
Year: 2009

description: This thesis presents a study of apolar host-guest complexations between a bowl-shaped cavitand host and small neutral organic guest molecules in aqueous solutions. The watersoluble host molecule-cavitand 1, with methyl groups on the rim positions and hydrophilic phosphate groups at the pendent positions, was synthesized. It forms 1:1 host-guest complexes in aqueous solutions exclusively with most investigated guest molecules. Binding constants of these complexes were determined from ¹H NMR titration experiments. The strongest bindings were found between host 1 and small ester guest molecules. Variable temperature NMR titration experiment uncovered that binding processes were driven by favorable enthalpy changes accompanied with unfavorable entropy changes. These results were discussed in terms of the attractive van der Waals interactions between host and guest as well as the hydrophobic effect. The geometry of the complexes in aqueous solution was elucidated by ¹H NMR spectroscopy and molecular mechanics calculations. For guests containing two potential binding sites, they form isomeric complexes with host 1.
Axial charges of N(1535) and N(1650) in lattice QCD with two flavors of dynamical quarks
Creators: name: Takahashi, Toru T.
name: Kunihiro, Teiji
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We show the first lattice QCD results on the axial charge $g_A^{N^*N^*}$ of $N^*(1535)$ and $N^*(1650)$. The measurements are performed with two flavors of dynamical quarks employing the renormalization-group improved gauge action at $β$=1.95 and the mean-field improved clover quark action with the hopping parameters, $κ$=0.1375, 0.1390 and 0.1400. In order to properly separate signals of $N^*(1535)$ and $N^*(1650)$, we construct 2$\times$2 correlation matrices and diagonalize them. Wraparound contributions in the correlator, which can be another source of signal contaminations, are eliminated by imposing the Dirichlet boundary condition in the temporal direction. We find that the axial charge of $N^*(1535)$ takes small values as $g_A^{N^*N^*}\sim {\mathcal O}(0.1)$, whereas that of $N^*(1650)$ is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.
description: 5pages, 3 figures, 1 table; Confusing notations were corrected. (v2); Results on N(1650) were added. (v3)
STATE TRADING, AGRICULTURAL MARKETING BOARDS, AND THE ROLE OF GOVERNMENT IN MARKETING
Creators: name: Dahl, Reynold P.
name: Dahl, Reynold P.
Publisher: name: Unknown
Year: 1972
Subjects: subject: Marketing
subject: FOS: Economics and business

description: The objectives of this paper are to (1) review the reasoning behind the extension of government into marketing operations in developing countries, (2) identify the principal types of marketing boards and state-trading operations that are found in developing countries and their functions, and (3) consider the question of balance between government and private enterprise in marketing with implications for research. . .
Integrated source of path-entangled photon pairs with efficient pump self-rejection
Creators: name: de la Hoz, P.
name: Sakovich, A.
name: Mikhalychev, A.
name: Thornton, M.
name: Korolkova, N.
name: Mogilevtsev, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a scheme for an integrated four-wave mixing source of narrow-band path-entangled photon pairs with efficient spatial pump self-rejection. The scheme is based on correlated loss in a system of waveguides in Kerr nonlinear media. We demonstrate that this setup allows for upwards of 100dB pump rejection, without additional filtering. The effect is reached by driving the symmetric collective mode that is strongly attenuated by an engineered dissipation, while photon pairs are born in the antisymmetric mode. A similar set-up can additionally be realized for generation of two-photon NOON states, also with pump self-rejection. We discuss implementation of the scheme by means of the coherent diffusive photonics, and demostrate its feasibility both in glass (such as fused silica-glass and IG2), and planar semiconductor waveguide structures in indium phosphide (InP) and in silicon.
description: 12 pages, 6 figures
THE COST OF INACCURATE CONSUMER INFORMATION: THE CASE OF THE EPA MILEAGE FIGURES
Creators: name: Roe, Terry L.
name: Sexauer, Benjamin
name: Kinsey, Jean D.
name: Roe, Terry L.
name: Sexauer, Benjamin
name: Kinsey, Jean D.
Publisher: name: Unknown
Year: 1981
Subjects: Consumer/Household Economics

description: In this study a utility maximizing model is developed which accommodates changing states of information. Rational consumer choices in one state of information can lead to realizing different levels of utility than anticipated. Differences between these levels of utility suggest a measure for the value of information. This framework is applied to estimating the potential cost of possible inaccuracies in the EPA fuel-economy ratings. Survey data collected from new car buyers then are used to infer the magnitude of the actual costs that may be caused by the present EPA information.
Large magnetic field-induced spectral weight enhancement of high-energy spin excitations in $La_{1.88}Sr_{0.12}CuO_{4}$
Creators: name: Machtoub, L. H.
name: Keimer, B.
name: Yamada, K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report electronic Raman scattering experiments on a superconducting ${\rm La_{1.88}Sr_{0.12}CuO_{4}}$ single crystal in a magnetic field. At low temperatures, the spectral weight of the high-energy two-magnon peak increases linearly with field and is amplified by a factor of more than two at 14 T. The effect disappears at elevated temperatures and is not present in undoped ${\rm La_{2}CuO_{4}}$. This observation is discussed in terms of an electronically inhomogeneous state in which the field enhances the volume fraction of a phase with local antiferromagnetic order at the expense of the superconducting phase.
description: to appear in PRL
title: TransVersales : état(s) provisoire(s) de la poésie contemporaine latino-américaine
Publisher: name: Université Toulouse - Jean Jaurès
Year: 2024

description: Le colloque international "TransVersales. État(s) provisoire(s) de la poésie latino-américaine contemporaine" se proposait de faire émerger et d’analyser des questions toujours essentielles comme le rythme, le rapport de l’écriture poétique à la finitude du temps, et de l’histoire au climax de l’anthropocène, les emmêlements de formes intertextuelles et intermédiales et les circulations esthétiques qui accompagnent et s’opposent au monde globalisé.
Vacuum expectation value renormalization in the Standard Model and beyond
Creators: name: Dūdėnas, Vytautas
name: Löschner, Maximilian
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show how the renormalization constant of the Higgs vacuum expectation value, fixed by a tadpole condition, is responsible for gauge dependences in various definitions of parameters in the $R_ξ$-gauge. Then we show the relationship of this renormalization constant to the Fleischer-Jegerlehner (FJ) scheme, which is used to avoid these gauge dependences. In this way, we also present a viewpoint on the FJ-scheme complementary to the ones already existing in the literature. Additionally, we compare and discuss different approaches to the renormalization of tadpoles by identifying the similarities and relations between them. The relationship to the Higgs background field renormalization is also discussed.
description: 16 pages; accepted for publication in prd
Science and exile: David Bohm, the hot times of the Cold War, and his struggle for a new interpretation of quantum mechanics
Creators: name: Freire, Olival
Publisher: name: arXiv
Year: 2005
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: This article focuses on the reception among physicists of Bohm's 1952 papers on the causal interpretation of quantum mechanics, which were poorly received at the time. I describe his Brazilian exile and analyze the culture of physics surrounding the foundations of quantum mechanics. I take into account the strength of the Copenhagen interpretation among physicists, the way in which issues concerning the foundations of quantum mechanics were present in the training of physicists, the low status of these issues on research agendas, and the kind of results Bohm and collaborators were able to achieve. I also compare the reception of Bohm's ideas with that of Hugh Everett's interpretation and argue that the obstacles growing from the cultural context of physics at that time had a more significant influence in the reception of Bohm's ideas than did the vicissitudes related to the McCarthyist climate.
description: 55 pages, submitted to Historical Studies on the Physical and Biological Sciences
Stirnimann, Heinrich; Hooft, Willem A. Visser't; Margull, Hans Jochen: Zukunft der Ökumene
Creators: name: Kg.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 24 Nr. 1 (1975): Ökumenische Rundschau, Band 24, Heft 1
Fred & Rosie Collins 1958
Creators: name: Klein, Carol
name: Klein, Sheldon
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2015
Subjects: subject: xaw
subject: Kawaiisu language

description: Digital copies of three photographs dated 1958 depicting Fred and Rosie Collins outside their home in Kelso, California. Scanned from original prints.
WHERE DOES MINNESOTA'S GRAIN CROP GO? AN ANALYSIS OF MINNESOTA ELEVATOR GRAIN SHIPMENTS FOR THE PERIOD, 7/99-6/00
Creators: name: Fruin, Jerry E.
name: Tiffany, Douglas G.
name: Fruin, Jerry E.
name: Tiffany, Douglas G.
Publisher: name: Unknown
Year: 2002
Subjects: Agribusiness

description: This study describes the movements of grain shipments from Minnesota to their final destinations. A sample of approximately 100 (20 percent) of Minnesota grain elevators reported their monthly grain shipments by mode to each of nine destinations from July 1999 to June 2000. The researchers used this data to project grain shipments from Minnesota and each of six crop reporting districts by grain and by transportation mode to final destination. Minneapolis and Mississippi River ports were the most important destinations, receiving 28.4percent of all shipments. Pacific Northwest export ports received 17.9 percent. Minnesota based corn, soybean, and wheat processors received 16.6 percent of shipments. Duluth-Superior received 10.5 percent and Mexico received 7 percent. Rail was utilized for 494 million bushels (14.1 million tons) or 64percent of all grains. Rail shipments of 50 or more cars accounted for 47 percent of all elevator shipments. Both destination and modal percentages varied substantially by grain and by crop reporting district.
Electronic structure of Li2Pd3B and Li2Pt3B
Creators: name: Chandra, Sharat
name: Jaya, S. Mathi
name: Valsakumar, M. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Li2Pd3B is known to be superconducting, while the isotypical Li2Pt3B compound is not. Electronic structures of Li2Pd3B and Li2Pt3B have been calculated in order to obtain an insight into this surprising difference, through an analysis of the differences in the band structures. The electronic structures of these systems were obtained using the Full Potential Linear Augmented Plane Wave plus local orbitals (FP-LAPW+lo) method and it was found that four bands cross the Fermi level (EF). Out of these four bands, only two bands contribute significantly to the density of states at the EF. One of these bands is a hole band and the other an electron band. Thus at least a two-band model is required for studying the electronic properties of the Pd and Pt compounds. These two bands are rather narrow and hence the coulombic correlations effects can be significant.
description: 18 pages, 8 figures, submitted to Physica C
Linear embedding of nonlinear dynamical systems and prospects for efficient quantum algorithms
Creators: name: Engel, Alexander
name: Smith, Graeme
name: Parker, Scott E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The simulation of large nonlinear dynamical systems, including systems generated by discretization of hyperbolic partial differential equations, can be computationally demanding. Such systems are important in both fluid and kinetic computational plasma physics. This motivates exploring whether a future error-corrected quantum computer could perform these simulations more efficiently than any classical computer. We describe a method for mapping any finite nonlinear dynamical system to an infinite linear dynamical system (embedding) and detail three specific cases of this method that correspond to previously-studied mappings. Then we explore an approach for approximating the resulting infinite linear system with finite linear systems (truncation). Using a number of qubits only logarithmic in the number of variables of the nonlinear system, a quantum computer could simulate truncated systems to approximate output quantities if the nonlinearity is sufficiently weak. Other aspects of the computational efficiency of the three detailed embedding strategies are also discussed.
description: 13 pages
Temporal Correlations of Local Network Losses
Creators: name: Stepanenko, A. S.
name: Constantinou, C. C.
name: Yurkevich, I. V.
name: Lerner, I. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We introduce a continuum model describing data losses in a single node of a packet-switched network (like the Internet) which preserves the discrete nature of the data loss process. {\em By construction}, the model has critical behavior with a sharp transition from exponentially small to finite losses with increasing data arrival rate. We show that such a model exhibits strong fluctuations in the loss rate at the critical point and non-Markovian power-law correlations in time, in spite of the Markovian character of the data arrival process. The continuum model allows for rather general incoming data packet distributions and can be naturally generalized to consider the buffer server idleness statistics.
Entanglement entropy and the Berry phase in solid states
Creators: name: Ryu, S.
name: Hatsugai, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The entanglement entropy (von Neumann entropy) has been used to characterize the complexity of many-body ground states in strongly correlated systems. In this paper, we try to establish a connection between the lower bound of the von Neumann entropy and the Berry phase defined for quantum ground states. As an example, a family of translational invariant lattice free fermion systems with two bands separated by a finite gap is investigated. We argue that, for one dimensional (1D) cases, when the Berry phase (Zak's phase) of the occupied band is equal to $π\times ({odd integer})$ and when the ground state respects a discrete unitary particle-hole symmetry (chiral symmetry), the entanglement entropy in the thermodynamic limit is at least larger than $\ln 2$ (per boundary), i.e., the entanglement entropy that corresponds to a maximally entangled pair of two qubits. We also discuss this lower bound is related to vanishing of the expectation value of a certain non-local operator which creates a kink in 1D systems.
description: 11 pages, 4 figures, new references added
Impact of Technology Games and Activities, Through CBI, on Multiplication Fluency
Creators: name: Ronson, Kelly
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: subject: Education -- Research papers (Graduate)

description: The purpose of this study was to determine the effectiveness of a lunchtime intervention involving computer based multiplication practice for fifth grade students struggling with multiplication facts. This study, occurring over 4 weeks, used a pre-test/post-test design in which post-test scores were compared between groups. All students received regular education instruction in mathematics. Students in the treatment group (n = 6) participated in a Lunch Bunch Program 3 times a week. Students in the control group (n = 6) did not participate in the Lunch Bunch Program. The mean fast facts multiplication score, based off of the number of multiplication fact problems from 0-10 correctly completed in five minutes, was significantly higher for the Lunch Bunch group (Mean = 93.00, SD = 6.90) than for the control group (Mean = 68.33, SD = 16.77 [t(10) = 3.33, p < .05]. Limitations and implications for practice and future research are discussed.
DYNAMICS OF THE AGRICULTURAL RESEARCH AND OUTPUT RELATIONSHIP
Creators: name: Pardey, Philip G.
name: Craig, Barbara J.
name: Pardey, Philip G.
name: Craig, Barbara J.
Publisher: name: Unknown
Year: 1987
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Allocative decisions concerning public sector agricultural research appear to be driven by both supply and, politically mediated, demand forces. In-sample Granger and Modified Sim's tests, along with post-sample predictive tests, suggest that simultaneity issues should not be ignored when modelling the research expenditure-output relationship. The results also provide strong evidence that the impact of research expenditures on agricultural output persists for at least 30 years. These lags are substantially longer than those commonly used for agricultural research to date. The lagged effect of output on research appears much shorter, at something less than 10 years.
Disorder in dissipation-induced topological states: Evidence for a different type of localization transition
Creators: name: Beck, Alon
name: Goldstein, Moshe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quest for nonequilibrium quantum phase transitions is often hampered by the tendency of driving and dissipation to give rise to an effective temperature, resulting in classical behavior. Could this be different when the dissipation is engineered to drive the system into a nontrivial quantum coherent steady state? In this work we shed light on this issue by studying the effect of disorder on recently-introduced dissipation-induced Chern topological states, and examining the eigenmodes of the Hermitian steady state density matrix or entanglement Hamiltonian. We find that, similarly to equilibrium, each Landau band has a single delocalized level near its center. However, using three different finite size scaling methods we show that the critical exponent $ν$ describing the divergence of the localization length upon approaching the delocalized state is significantly different from equilibrium if disorder is introduced into the non-dissipative part of the dynamics. This indicates a different type of nonequilibrium quantum critical universality class accessible in cold-atom experiments.
description: typo fixed in abstract
Dark Matter in the Central Regions of Early Type Galaxies
Creators: name: Cappellari, M.
name: Bacon, R.
name: Bureau, M.
name: Damen, M. C.
name: Davies, R. L.
name: de Zeeuw, P. T.
name: Emsellem, E.
name: Falcon-Barroso, J.
name: Krajnovic, D.
name: Kuntschner, H.
name: McDermid, R. M.
name: Peletier, R. F.
name: Sarzi, M.
name: Bosch, R. C. E. van den
name: van de Ven, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the well-known correlations between the dynamical mass-to-light ratio M/L and other global observables of elliptical (E) and lenticular (S0) galaxies. We construct two-integral Jeans and three-integral Schwarzschild dynamical models for a sample of 25 E/S0 galaxies with SAURON integral-field stellar kinematics to about one effective (half-light) radius R_e. The comparison of the dynamical M/L with the (M/L)_pop inferred from the analysis of the stellar population, indicates that dark matter in early-type galaxies contributes ~30% of the total mass inside one R_e, in agreement with previous studies, with significant variations from galaxy to galaxy. Our results suggest a variation in M/L at constant (M/L)_pop, which seems to be linked to the galaxy dynamics. We speculate that fast rotating galaxies have lower dark matter fractions than the slow rotating and generally more massive ones.
description: 4 pages, 3 figures, LaTeX. Proceedings of the XXIst IAP Colloquium "Mass Profiles and Shapes of Cosmological Structures", Editors: G. Mamon, F. Combes, C. Deffayet, B. Fort, EDP Sciences, in press
Quantum trajectories, feedback and squeezing
Creators: name: Barchielli, A.
name: gregoratti, M.
name: Licciardo, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum trajectory theory is the best mathematical set up to model continual observations of a quantum system and feedback based on the observed output. Inside this framework, we study how to enhance the squeezing of the fluorescence light emitted by a two-level atom, stimulated by a coherent monochromatic laser. In the presence of a Wiseman-Milburn feedback scheme, based on the homodyne detection of a fraction of the emitted light, we analyze the squeezing dependence on the various control parameters.
description: 8 pages, 2 figures, "Noise Information & Complexity @ Quantum Scale" Proceedings
Squared visibility estimator. Calibrating biases to reach very high dynamic range
Creators: name: Perrin, G.
name: Ridgway, S. T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the near infrared where detectors are limited by read-out noise, most interferometers have been operated in wide band in order to benefit from larger photon rates. We analyze in this paper the biases caused by instrumental and turbulent effects to $V^2$ estimators for both narrow and wide band cases. Visibilities are estimated from samples of the interferogram using two different estimators, $V^{2}_1$ which is the classical sum of the squared modulus of Fourier components and a new estimator $V^{2}_2$ for which complex Fourier components are summed prior to taking the square. We present an approach for systematically evaluating the performance and limits of each estimator, and to optimizing observing parameters for each. We include the effects of spectral bandwidth, chromatic dispersion, scan length, and differential piston. We also establish the expression of the Signal-to-Noise Ratio of the two estimators with respect to detector and photon noise. The $V^{2}_1$ estimator is insensitive to dispersion and is always more sensitive than the $V^{2}_2$ estimator. However, the latter allows to reach better accuracies when detection is differential piston noise limited. Biases and noise directly impact the dynamic range of reconstructed images. Very high dynamic ranges are required for direct exoplanet detection by interferometric techniques thus requiring estimators to be bias-free or biases to be accurately calibrated. We discuss which estimator and which conditions are optimum for astronomical applications especially when high accuracy visibilities are required. We show that there is no theoretical limit to measuring visibilities with accuracies as good as $10^{-5}$ which is important in the prospect of detecting faint exoplanets with interferometers.
description: 23 pages, 6 figures, accepted for publication in ApJ
AGRICULTURAL MODERNIZATION IN MARKET AND PLANNED ECONOMIES: THE GERMAN EXPERIENCE
Creators: name: Weber, Adolf
name: Weber, Adolf
Publisher: name: Unknown
Year: 1971
Subjects: International Development

description: In this paper, views of large scale farm organization are traced from the 19th century to date. Then, the structures of East and West German industry and agriculture are described. Next the productivity of East and West German agricultural land and labor are compared for the period 1958-1969. The paper is concluded with general observations on the effects of collectivization. Implications are drawn for nations now evaluating alternative solutions to economic and social problems of agricultural development.
The Einstein-Vlasov system/Kinetic theory
Creators: name: Andreasson, Hakan
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The main purpose of this article is to provide a guide to theorems on global properties of solutions to the Einstein-Vlasov system. This system couples Einstein's equations to a kinetic matter model. Kinetic theory has been an important field of research during several decades in which the main focus has been on nonrelativistic and special relativistic physics, {\it i.e.} to model the dynamics of neutral gases, plasmas, and Newtonian self-gravitating systems. In 1990, Rendall and Rein initiated a mathematical study of the Einstein-Vlasov system. Since then many theorems on global properties of solutions to this system have been established. The Vlasov equation describes matter phenomenologically and it should be stressed that most of the theorems presented in this article are not presently known for other such matter models ({\it i.e.} fluid models). This paper gives introductions to kinetic theory in non-curved spacetimes and then the Einstein-Vlasov system is introduced. We believe that a good understanding of kinetic theory in non-curved spacetimes is fundamental to good comprehension of kinetic theory in general relativity.
description: 40 pages, updated version, to appear in Living Reviews in Relativity
Chaos and Ergodicity in Extended Quantum Systems with Noisy Driving
Creators: name: Kos, Pavel
name: Bertini, Bruno
name: Prosen, Tomaž
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the time evolution operator in a family of local quantum circuits with random fields in a fixed direction. We argue that the presence of quantum chaos implies that at large times the time evolution operator becomes effectively a random matrix in the many-body Hilbert space. To quantify this phenomenon we compute analytically the squared magnitude of the trace of the evolution operator -- the generalised spectral form factor -- and compare it with the prediction of Random Matrix Theory (RMT). We show that for the systems under consideration the generalised spectral form factor can be expressed in terms of dynamical correlation functions of local observables in the infinite temperature state, linking chaotic and ergodic properties of the systems. This also provides a connection between the many-body Thouless time $τ_{\rm th}$ -- the time at which the generalised spectral form factor starts following the random matrix theory prediction -- and the conservation laws of the system. Moreover, we explain different scalings of $τ_{\rm th}$ with the system size, observed for systems with and without the conservation laws.
description: 7+10 pages, 5 figures, 1 table; v2 improved exposition with the additional section I in SM
Tutorial: Dirac Equation Perspective on Higher-Order Topological Insulators
Creators: name: Schindler, Frank
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this tutorial, we pedagogically review recent developments in the field of non-interacting fermionic phases of matter, focussing on the low energy description of higher-order topological insulators in terms of the Dirac equation. Our aim is to give a mostly self-contained treatment. After introducing the Dirac approximation of topological crystalline band structures, we use it to derive the anomalous end and corner states of first- and higher-order topological insulators in one and two spatial dimensions. In particular, we recast the classical derivation of domain wall bound states of the Su-Schrieffer-Heeger (SSH) chain in terms of crystalline symmetry. The edge of a two-dimensional higher-order topological insulators can then be viewed as a single crystalline symmetry-protected SSH chain, whose domain wall bound states become the corner states. We never explicitly solve for the full symmetric boundary of the two-dimensional system, but instead argue by adiabatic continuity. Our approach captures all salient features of higher-order topology while remaining analytically tractable.
description: 24 pages, 7 figures. v3: fixed inconsistencies of journal version
Inhomogeneous perturbations of plane-wave spacetimes
Creators: name: Hervik, Sigbjorn
name: Coley, Alan
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently it was shown that the exact cosmological solutions known as the vacuum plane-wave solutions are late-time attractors for an open set of the spatially homogeneous Bianchi universes containing a non-inflationary $γ$-law perfect fluid. In this paper we study inhomogeneous perturbations of these plane-wave spacetimes. By using expansion-normalised scale-invariant variables we show that these solutions are unstable to generic inhomogeneous perturbations. The crucial observation for establishing this result is a divergence of the expansion-normalised frame variables which ultimately leads to unstable modes.
description: 8 pages, to appear in CQG