cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Role of Innovations in the Competitive Strategies of Italian Agri-Food Enterprises
Creators: name: Coppola, Adele
name: Pascucci, Stefano
name: Coppola, Adele
name: Pascucci, Stefano
Publisher: name: Unknown
Year: 2007
Subjects: Agribusiness
Research and Development/Tech Change/Emerging Technologies

description: The aim of this work has been to inquire into possible connections between competitive strategies and inclination to innovation, through an analysis of a sample of Italian agri-food enterprises behaviours. Particularly, some firm’s innovation strategies have been analysed, inquiring into a set of characteristics that at a theoretical level are considered as potential factors of innovation adoption : economic and financial dimension, organizational structure, productive specialization, productive process and the location context. The results of the study have underlined the existence of a great variety of behaviours among the examined agri-food enterprises, which have revealed a highly varied inclination to innovation. The data indicate that the stimulus to innovation is the result of a set of factors that jointly act on the decisional nucleus of the enterprises. Moreover, the results point out that the processes of “organizational” innovation are gaining a more and more relevant role in Italian agri-food enterprises, while very strong elements of weakness seem to characterize the processes of technological innovation, above all because of a reduced inclination to both public and private investments in R&D.
Transcription of story about Verdena meeting Otis
Creators: name: Parker, Verdena
name: Lee-Wynant, Tyler
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-211217-02: continued transcription of story about how Verdena met Otis, file VP-011011-10, from 9:31.
The red rain phenomenon of Kerala and its possible extraterrestrial origin
Creators: name: Louis, Godfrey
name: Kumar, A. Santhosh
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A red rain phenomenon occurred in Kerala, India starting from 25th July 2001, in which the rainwater appeared coloured in various localized places that are spread over a few hundred kilometers in Kerala. Maximum cases were reported during the first 10 days and isolated cases were found to occur for about 2 months. The striking red colouration of the rainwater was found to be due to the suspension of microscopic red particles having the appearance of biological cells. These particles have no similarity with usual desert dust. An estimated minimum quantity of 50,000 kg of red particles has fallen from the sky through red rain. An analysis of this strange phenomenon further shows that the conventional atmospheric transport processes like dust storms etc. cannot explain this phenomenon. The electron microscopic study of the red particles shows fine cell structure indicating their biological cell like nature. EDAX analysis shows that the major elements present in these cell like particles are carbon and oxygen. Strangely, a test for DNA using Ethidium Bromide dye fluorescence technique indicates absence of DNA in these cells. In the context of a suspected link between a meteor airburst event and the red rain, the possibility for the extraterrestrial origin of these particles from cometary fragments is discussed.
description: 18 pages, 15 figures, accepted for publication in Astrophysics and Space Science
Constraints on quasinormal modes and bounds for critical points from pole-skipping
Creators: name: Abbasi, Navid
name: Kaminski, Matthias
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider a holographic thermal state and perturb it by a scalar operator whose associated real-time Green's function has only gapped poles. These gapped poles correspond to the non-hydrodynamic quasinormal modes of a massive scalar perturbation around a Schwarzschild black brane. Relations between pole-skipping points, critical points and quasinormal modes in general emerge when the mass of the scalar and hence the dual operator dimension is varied. First, this novel analysis reveals a relation between the location of a mode in the infinite tower of quasinormal modes and the number of pole-skipping points constraining its dispersion relation at imaginary momenta. Second, for the first time, we consider the radii of convergence of the derivative expansions about the gapped quasinormal modes. These convergence radii turn out to be bounded from above by the set of all pole-skipping points. Furthermore, a transition between two distinct classes of critical points occurs at a particular value for the conformal dimension, implying close relations between critical points and pole-skipping points in one of those two classes. We show numerically that all of our results are also true for gapped modes of vector and tensor operators.
description: 27 pages, 11 figures, comments welcome. v2: references added, minor corrections, journal version
Neutron stars in $f(\mathcal{R,T})$ gravity using realistic equations of state in the light of massive pulsars and GW170817
Creators: name: Lobato, R.
name: Lourenço, O.
name: Moraes, P. H. R. S.
name: Lenzi, C. H.
name: de Avellar, M.
name: de Paula, W.
name: Dutra, M.
name: Malheiro, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we investigate neutron stars (NS) in $f(\mathcal{R,T})$ gravity for the case $R+2λ\mathcal{T}$, $\mathcal{R}$ is the Ricci scalar and $\mathcal{T}$ the trace of the energy-momentum tensor. The hydrostatic equilibrium equations are solved considering realistic equations of state (EsoS). The NS masses and radii obtained are subject to a joint constrain from massive pulsars and the event GW170817. The parameter $λ$ needs to be negative as in previous NS studies, however we found a minimum value for it. The value should be $|λ|\lesssim0.02$ and the reason for so small value in comparison with previous ones obtained with simpler EsoS is due to the existence of the NS crust. The pressure in theory of gravity depends on the inverse of the sound velocity $v_s$. Since, $v_s$ is low in the crust, $|λ|$ need to be very small. We found that the increment in the star mass is less than $1\%$, much smaller than previous ones obtained not considering the realistic stellar structure, and the star radius cannot become larger, its changes compared to GR is less than $3.6\%$ in all cases. The finding that using several relativistic and non-relativistic models the variation on the NS mass and radius are almost the same for all the EsoS, manifests that our results are insensitive to the high density part of the EsoS. It confirms that stellar mass and radii changes depend only on crust, where the EoS is essentially the same for all the models. The NS crust effect implying very small values of $|λ|$ does not depend on the theory's function chosen, since for any other one the hydrostatic equilibrium equation would always have the dependence $1/v_s$. Finally, we highlight that our results indicate that conclusions obtained from NS studies done in modified theories of gravity without using realistic EsoS that describe correctly the NS interior can be unreliable.
description: Few typos corrected and new references added. Matches the published version
Simultaneous similarity, bounded generation and amenability
Creators: name: Pisier, Gilles
Publisher: name: arXiv
Year: 2005
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 46 L06. Seconday: 46L07, 46L57 Primary 46 L06. Seconday: 46L07, 46L57 46 L06, 46L07, 46L57

description: We prove that a discrete group $G$ is amenable iff it is strongly unitarizable in the following sense: every unitarizable representation $π$ on $G$ can be unitarized by an invertible chosen in the von Neumann algebra generated by the range of $π$. Analogously a $C^*$-algebra $A$ is nuclear iff any bounded homomorphism $u: A\to B(H)$ is strongly similar to a $*$-homomorphism in the sense that there is an invertible operator $ξ$ in the von Neumann algebra generated by the range of $u$ such that $a\to ξu(a) ξ^{-1}$ is a $*$-homomorphism. An analogous characterization holds in terms of derivations. We apply this to answer several questions left open in our previous work concerning the length $\ell(A,B)$ of the maximal tensor product $A\otimes_{\max} B$ of two unital $C^*$-algebras, when we consider its generation by the subalgebras $A\otimes 1$ and $1\otimes B$. We show that if $\ell(A,B)
description: There are several improvements both to the exposition and to some results. The main refinement is that if the length of the minimal (rather than the maximal) tensor product of $A$ with another $C^*$-algebra $B$ is always finite, then $A$ is nuclear
Heat transport through a superconducting artificial atom
Creators: name: Xu, Meng
name: Stockburger, J. T.
name: Ankerhold, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum heat transfer through a generic superconducting set-up consisting of a tunable transmon qubit placed between resonators that are termined by thermal reservoirs is explored. Two types of architectures are considered, a sequential and a beam splitter setting. Applying the numerical exact hierarchical equation of motion (HEOM) approach, steady state properties are revealed, and experimentally relevant parameter sets are identified. Benchmark results are compared with predictions based on approximate treatments to demonstrate their failure in broad ranges of parameter space. These findings may allow to improve future designs for heat control in superconducting devices.
description: 16 pages, 17 figures
Electron wave functions on $T^2$ in a static magnetic field of arbitrary direction
Creators: name: Encinosa, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Computational Physics (physics.comp-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A basis set expansion is performed to find the eigenvalues and wave functions for an electron on a toroidal surface $T^2$ subject to a constant magnetic field in an arbitrary direction. The evolution of several low-lying states as a function of field strength and field orientation is reported, and a procedure to extend the results to include two-body Coulomb matrix elements on $T^2$ is presented.
description: 18 pages, 6 figures
Tachyon Condensation on Separated Brane-Antibrane System
Creators: name: Bagchi, Arjun
name: Sen, Ashoke
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the effect of tachyon condensation on a brane antibrane pair in superstring theory separated in the transverse direction. The static properties of the tachyon potential analyzed using level truncated string field theory reproduces the desired property that the dependence of the minimum value of the potential on the initial distance of separation between the branes decreases as we include higher level terms. The rolling tachyon solution constructed using the conformal field theory methods shows that if the initial separation between the branes is less than a critical distance then the solution is described by an exactly marginal deformation of the original conformal field theory where the correlation functions of the deformed theory are determined completely in terms of the correlation functions of the undeformed theory without any need to regularize the theory. Using this we give an expression for the pressure on the brane-antibrane system as a power series expansion in \exp(C x^0) for an appropriate constant C.
description: LaTeX file, 27 pages
Improved (e,e') response functions at intermediate momentum transfers: the 3He case
Creators: name: Efros, Victor D.
name: Leidemann, Winfried
name: Orlandini, Giuseppina
name: Tomusiak, Edward L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A possibility of extending the applicability range of non-relativistic calculations of electronuclear response functions in the quasielasic peak region is studied. We show that adopting a particular model for determining the kinematical inputs of the non-relativistic calculations can extend this range considerably, almost eliminating the reference frame dependence of the results. We also show that there exists one reference frame, where essentially the same result can be obtained with no need of adopting the particular kinematical model. The calculation is carried out with the Argonne V18 potential and the Urbana IX three-nucleon interaction. A comparison of these improved calculations with experimental data shows a very good agreement for the quasielastic peak positions at $q=500,$ 600, 700 MeV/c and for the peak heights at the two lower $q$--values, while for the peak height at $q=700$ MeV/c one finds differences of about 20%.
description: 10 pages, 4 figures
Finite temperature properties of the Dirac operator with bag boundary conditions
Creators: name: Beneventano, C. G.
name: Santangelo, E. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the finite temperature free energy and fermion number for Dirac fields in a one-dimensional spatial segment, under local boundary conditions compatible with the presence of a spectral asymmetry. We discuss in detail the contribution of this part of the spectrum to the determinant. We evaluate the finite temperature properties of the theory for arbitrary values of the chemical potential.
description: Talk given at the Seventh International Workshop Quantum Field Theory under the influence of External Conditions, QFEXT'05, Barcelona, Spain. Final version, to appear in Journal of Physics A: Mathematical and General
Inter-particle ratchet effect determines global current of heterogeneous particles diffusing in confinement
Creators: name: Mallmin, Emil
name: Blythe, Richard A.
name: Evans, Martin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In a model of $N$ volume-excluding spheres in a $d$-dimensional tube, we consider how differences between particles in their drift velocities, diffusivities, and sizes influence the steady state distribution and axial particle current. We show that the model is exactly solvable when the geometrical constraints prevent any particle from overtaking every other -- a notion we term quasi-one-dimensionality. Then, due to a ratchet effect, the current is biased towards the velocities of the least diffusive particles. We consider special cases of this model in one dimension, and derive the exact joint gap distribution for driven tracers in a passive bath. We describe the relationship between phase space structure and irreversible drift that makes the quasi-one-dimensional supposition key to the model's solvability.
description: 26 pages, 7 figures
Self-Concordant Analysis of Generalized Linear Bandits with Forgetting
Creators: name: Russac, Yoan
name: Faury, Louis
name: Cappé, Olivier
name: Garivier, Aurélien
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Contextual sequential decision problems with categorical or numerical observations are ubiquitous and Generalized Linear Bandits (GLB) offer a solid theoretical framework to address them. In contrast to the case of linear bandits, existing algorithms for GLB have two drawbacks undermining their applicability. First, they rely on excessively pessimistic concentration bounds due to the non-linear nature of the model. Second, they require either non-convex projection steps or burn-in phases to enforce boundedness of the estimators. Both of these issues are worsened when considering non-stationary models, in which the GLB parameter may vary with time. In this work, we focus on self-concordant GLB (which include logistic and Poisson regression) with forgetting achieved either by the use of a sliding window or exponential weights. We propose a novel confidence-based algorithm for the maximum-likehood estimator with forgetting and analyze its perfomance in abruptly changing environments. These results as well as the accompanying numerical simulations highlight the potential of the proposed approach to address non-stationarity in GLB.
title: Von Wotan, Radegast und Remus – Mythische Vorfahren in herrschaftlichen Landschaftsgärten
Creators: name: Niedermeier, Michael
Publisher: name: Max Weber Stiftung
Year: 2023
Subjects: subject: Stowe (Buckinghamshire)
subject: Hohenzieritz
subject: Rheinsberg
subject: Landschaftsgarten
subject: Mythos
subject: Herrschaft
subject: Legitimation
subject: 94
subject: 712
subject: 32

description: Ausgehend von alten Überlieferungsgeschichten formten selbst aufgeklärt-gebildete Gartenbesitzer im 18. Jahrhundert ihre frühen Landschaftsgärten zu Memorialorten eigener fiktiver dynastischer Abstammung. Echte oder gefälschte archäologische Funde verbanden die Gartenlandschaften mit mythisch-antiken Stammvätern wie Remus, Askenas, Arminius, Wotan, Hengist, Horsa oder Radegast, um den herrschaftlichen Besitzanspruch durch genealogische Verortung in der Landschaft zu belegen. An drei Beispielen – Stowe Gardens in Buckinghamshire mit der altsächsischen Wotan-Legende, Hohenzieritz bei Neubrandenburg mit dem wendisch-vandalischen Radegast-Heiligtum Rethra und insbesondere mit dem Park von Rheinsberg mit dem Grabmal und der Insel des Romulos-Bruders Remus – wird dargestellt, wie die Besitzer und Gestalter Richard Temple, First Viscount Cobham (1675–1749), Herzog Carl II. von Mecklenburg-Strelitz (1741–1816) und Kronprinz Friedrich (1712–1786) bzw. Prinz Heinrich von Preußen (1726–1802) ihre Gärten zu Erinnerungslandschaften fiktiver dynastischer Herkommens gestalteten.
description: Gespräche am Rheinsberger Musenhof – Auftakt: Beiträge des ersten Kolloquiums vom 6. und 7. Mai 2022, p. 35
Algebraic Hamiltonian actions
Creators: name: Losev, Ivan V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 14L30, 53D20

description: In this paper we deal with a Hamiltonian action of a reductive algebraic group $G$ on an irreducible normal affine Poisson variety $X$. We study the invariant moment map $ψ_{G,X}:X\to \g$, that is, the composition of the moment map $μ_{G,X}:X\to g:=Lie(G)$ and the quotient morphism $g\to g\quo G$. We obtain some results on the dimensions of fibers of $ψ_{G,X}$ and the corresponding morphism of quotients $X\quo G\to g\quo G$. We also study the "Stein factorisation" of $ψ_{G,X}$. Namely, let $C_{G,X}$ denote the spectrum of the integral closure of $ψ_{G,X}^*(K[g]^G)$ in $K(X)^G$. We investigate the structure of the $g\quo G$-scheme $C_{G,X}$. Our results partially generalize those obtained by F. Knop in the case of the actions on cotangent bundles and symplectic vector spaces.
description: v1 46 pages, v2 37 pages, major corrections are made, Theorem 1.5 and its proof are removed, v3 38 pages, final version to appear in Math. Z
Learning Acoustic Scattering Fields for Dynamic Interactive Sound Propagation
Creators: name: Tang, Zhenyu
name: Meng, Hsien-Yu
name: Manocha, Dinesh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Sound (cs.SD)
subject: Graphics (cs.GR)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We present a novel hybrid sound propagation algorithm for interactive applications. Our approach is designed for dynamic scenes and uses a neural network-based learned scattered field representation along with ray tracing to generate specular, diffuse, diffraction, and occlusion effects efficiently. We use geometric deep learning to approximate the acoustic scattering field using spherical harmonics. We use a large 3D dataset for training, and compare its accuracy with the ground truth generated using an accurate wave-based solver. The additional overhead of computing the learned scattered field at runtime is small and we demonstrate its interactive performance by generating plausible sound effects in dynamic scenes with diffraction and occlusion effects. We demonstrate the perceptual benefits of our approach based on an audio-visual user study.
String order parameters for symmetry fractionalization in an enriched toric code
Creators: name: Garre-Rubio, José
name: Iqbal, Mohsin
name: Stephen, David T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a simple model of symmetry-enriched topological order obtained by decorating a toric code model with lower-dimensional symmetry-protected topological states. We show that the symmetry fractionalization in this model can be characterized by string order parameters, and that these signatures are robust under the effects of external fields and interactions, up to the phase transition point. This extends the recent proposal of [New Journal of Physics 21, 113016 (2019)] beyond the setting of fixed-point tensor network states, and solidifies string order parameters as a useful tool to characterize and detect symmetry fractionalization. In addition to this, we observe how the condensation of an anyon that fractionalizes a symmetry forces that symmetry to spontaneously break, and we give a proof of this in the framework of projected entangled pair states. This phenomenon leads to a notable change in the phase diagram of the toric code in parallel magnetic fields.
description: Changes in title, astract and introdution. 11+7 pages, 7+3 figures, 2 tables
Quantum Simulation of Tunable and Ultrastrong Mixed-Optomechanics
Creators: name: Zhou, Yue-Hui
name: Yin, Xian-Li
name: Liao, Jie-Qiao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a reliable scheme to simulate tunable and ultrastrong mixed (first-order and quadratic optomechanical couplings coexisting) optomechanical interactions in a coupled two-mode bosonic system, in which the two modes are coupled by a cross-Kerr interaction and one of the two modes is driven through both the single- and two-excitation processes. We show that the mixed-optomechanical interactions can enter the single-photon strong-coupling and even ultrastrong-coupling regimes. The strengths of both the first-order and quadratic optomechanical couplings can be controlled on demand, and hence first-order, quadratic, and mixed optomechanical models can be realized. In particular, the thermal noise of the driven mode can be suppressed totally by introducing a proper squeezed vacuum bath. We also study how to generate the superposition of coherent squeezed state and vacuum state based on the simulated interactions. The quantum coherence effect in the generated states is characterized by calculating the Wigner function in both the closed- and open-system cases. This work will pave the way to the observation and application of ultrastrong optomechanical effects in quantum simulators.
description: 15 pages, 6 figures
A Weakly Nonlinear Analysis of Impulsively-Forced Faraday Waves
Creators: name: Catlla, Anne
name: Porter, Jeff
name: Silber, Mary
Publisher: name: arXiv
Year: 2005
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Parametrically-excited surface waves, forced by a periodic sequence of delta-function impulses, are considered within the framework of the Zhang-Viñals model (J. Fluid Mech. 1997). The exact impulsive-forcing results, in the linear and weakly nonlinear regimes, are compared with numerical results for sinusoidal and multifrequency forcing. We find surprisingly good agreement between impulsive forcing results and those obtained using a two-term truncated Fourier series representation of the impulsive forcing function. As noted previously by Bechhoefer and Johnson (Am. J. Phys. 1996), in the case of two equally-spaced impulses per period there are only subharmonic modes of instability. The familiar situation of alternating subharmonic and harmonic resonance tongues emerges for unequally-spaced impulses. We extend the linear analysis for two impulses per period to the weakly nonlinear regime for one-dimensional waves. Specifically, we derive an analytic expression for the cubic Landau coefficient in the bifurcation equation as a function of the dimensionless fluid parameters and spacing between the two impulses. As the capillary parameter is varied, one finds a parameter region of wave amplitude suppression, which is due to a familiar 1:2 spatio-temporal resonance between the subharmonic mode of instability and a damped harmonic mode. This resonance occurs for impulsive forcing even when harmonic resonance tongues are absent from the neutral stability curve. The strength of this resonance feature can be tuned by varying the spacing between the impulses. This finding is interpreted in terms of a recent symmetry-based analysis of multifrequency forced Faraday waves by Porter, Topaz and Silber (Phys. Rev. Lett. 2004, Phys. Rev. E 2004).
description: 13 pages, 10 figures, submitted to Physical Review E
Recounting Dyons in N=4 String Theory
Creators: name: Shih, David
name: Strominger, Andrew
name: Yin, Xi
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A recently discovered relation between 4D and 5D black holes is used to derive weighted BPS black hole degeneracies for 4D N=4 string theory from the well-known 5D degeneracies. They are found to be given by the Fourier coefficients of the unique weight 10 automorphic form of the modular group Sp(2,Z). This result agrees exactly with a conjecture made some years ago by Dijkgraaf, Verlinde and Verlinde.
description: 5 pages
Transcription of the narration of Reel #3 (collection LA 256)
Creators: name: Parker, Verdena
name: Lee-Wynant, Tyler
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-201217-10a/c: transcription of VP-180317-09 (narration of Reel #3 from the LA 256 collection at SCOIL, one of six reels of 8mm film created by Verdena in the 1960s, featuring scenes of everyday life around Hoopa Valley as well as Brush Dances), from 7:03 to 8:04. Due to re-numbering, Reel #3 has been assigned the CLA item number LA 256.042.
Groups of outer type E6 with trivial Tits algebras
Creators: name: Garibaldi, Skip
name: Petersson, Holger P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Group Theory (math.GR)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 20G15 (Primary) 17C40, 17B25 (Secondary)

description: In two 1966 papers, Jacques Tits gave a construction of exceptional Lie algebras (hence implicitly exceptional algebraic groups) and a classification of possible indexes of simple algebraic groups. For the special case of his construction that gives groups of type E6, we connect the two papers by answering the question: Given an Albert algebra A and a separable quadratic field extension K, what is the index of the resulting algebraic group?
description: 29 pages. For possibly newer versions, see http://www.mathcs.emory.edu/~skip/preprints.html
SuperHiggs Mechanism in String Theory
Creators: name: Bagger, Jonathan
name: Giannakis, Ioannis
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We exhibit the superHiggs effect in heterotic string theory by turning on a background NS-NS field and deforming the BRST operator consistent with superconformal invariance. The NS-NS field spontaneously breaks spacetime supersymmetry. We show how the gravitini and the physical dilatini gain mass by eating the would-be Goldstone fermions.
description: Six pages
To heat or not to heat: time crystallinity and finite-size effects in clean Floquet systems
Creators: name: Pizzi, Andrea
name: Malz, Daniel
name: De Tomasi, Giuseppe
name: Knolle, Johannes
name: Nunnenkamp, Andreas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A cornerstone assumption that most literature on discrete time crystals has relied on is that homogeneous Floquet systems generally heat to a featureless infinite temperature state, an expectation that motivated researchers in the field to mostly focus on many-body localized systems. Some works have however shown that the standard diagnostics for time crystallinity apply equally well to clean settings without disorder. This fact raises the question whether an homogeneous discrete time crystal is possible in which the originally expected heating is evaded. Studying both a localized and an homogeneous model with short-range interactions, we clarify this issue showing explicitly the key differences between the two cases. On the one hand, our careful scaling analysis confirms that, in the thermodynamic limit and in contrast to localized discrete time crystals, homogeneous systems indeed heat. On the other hand, we show that, thanks to a mechanism reminiscent of quantum scars, finite-size homogeneous systems can still exhibit very crisp signatures of time crystallinity. A subharmonic response can in fact persist over timescales that are much larger than those set by the integrability-breaking terms, with thermalization possibly occurring only at very large system sizes (e.g., of hundreds of spins). Beyond clarifying the emergence of heating in disorder-free systems, our work casts a spotlight on finite-size homogeneous systems as prime candidates for the experimental implementation of nontrivial out-of-equilibrium physics.
description: 8 + 3 pages, 4 + 2 figures
Intrinsic quasi-metrics
Creators: name: Rainio, Oona
Publisher: name: arXiv
Year: 2020
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 51M10 (Primary) 51M16 (Secondary)

description: The point pair function $p_G$ defined in a domain $G\subsetneq\mathbb{R}^n$ is shown to be a quasi-metric and its other properties are studied. For a convex domain $G\subsetneq\mathbb{R}^n$, a new intrinsic quasi-metric called the function $w_G$ is introduced. Several sharp results are established for these two quasi-metrics, and their connection to the triangular ratio metric is studied.
description: 18 pages, 1 figure
Gauge Theory of Gravity and Supergravity
Creators: name: Kaul, Romesh K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a formulation of gravity in terms of a theory based on complex SU(2) gauge fields with a general coordinate invariant action functional quadratic in the field strength. Self-duality or anti-self-duality of the field strength emerges as a constraint from the equations of motion of this theory. This in turn leads to Einstein gravity equations for a dilaton and an axion conformally coupled to gravity for the self-dual constraint. The analysis has also been extended to N=1 and 2 super Yang-Mills theory of complex SU(2) gauge fields. This leads, besides other equations of motion, to self-duality/anti-self-duality of generalized supercovariant field-strengths. The self-dual case is then shown to yield as its solutions $N = 1, 2$ supergravity equations respectively.
description: 27 pages
title: Mapping our future with the Digital Atlas of Australia
Creators: name: K., Hanwright
name: K., Hanwright
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2024
Subjects: subject: outreach
subject: Wednesday Seminar
subject: Digital Atlas of Australia
subject: Graph
subject: social and multimedia data
subject: Data management and data science not elsewhere classified
subject: Published_External

description: Join the team behind the Digital Atlas of Australia to explore how they are collaborating with government partners to transform how we access and use location data.  In this webinar, key partner agencies - earlier adopters of the Australian Government’s new geospatial platform - will share valuable insights on how they are using the Digital Atlas. You will learn how the Australian Bureau of Statistics, the Department of Social Services, and the Department of Industry, Science and Resources, are making their data easier to access and use and the innovative, interactive maps and tools they’re creating collaboratively to unlock place-based insights to inform their policy, program and service delivery.   Whether you're a seasoned professional or new to geospatial data, this webinar will showcase how the Digital Atlas is transforming decision-making and driving cross-sector innovation.   About the Digital Atlas of AustraliaDeveloped and delivered by Geoscience Australia, the Digital Atlas provides access to hundreds of curated trusted national datasets in one location. It uses location as the connecting thread to bring together data on Australia’s geography, people, economy and the environment to support informed place-based decisions across various sectors. Learn more about the Digital Atlas: https://digital.atlas.gov.au/pages/about
LifeStream: A High-Performance Stream Processing Engine for Periodic Streams
Creators: name: Jayarajan, Anand
name: Hau, Kimberly
name: Goodwin, Andrew
name: Pekhimenko, Gennady
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Hospitals around the world collect massive amounts of physiological data from their patients every day. Recently, there has been an increase in research interest to subject this data to statistical analysis to gain more insights and provide improved medical diagnoses. Such analyses require complex computations on large volumes of data, demanding efficient data processing systems. This paper shows that currently available data processing solutions either fail to meet the performance requirements or lack simple and flexible programming interfaces. To address this problem, we propose \emph{LifeStream}, a high-performance stream processing engine for physiological data. LifeStream hits the sweet spot between ease of programming by providing a rich temporal query language support and performance by employing optimizations that exploit the periodic nature of physiological data. We demonstrate that LifeStream achieves end-to-end performance up to $7.5\times$ higher than state-of-the-art streaming engines and $3.2\times$ than hand-optimized numerical libraries on real-world datasets and workloads.
System Dynamics in Quality Certifications: Development of an Audit Quality Controlling System
Creators: name: Albersmeier, Friederike
name: Schulze, Holger
name: Spiller, Achim
name: Albersmeier, Friederike
name: Schulze, Holger
name: Spiller, Achim
Publisher: name: Unknown
Year: 2007
Subjects: Agribusiness
Food Consumption/Nutrition/Food Safety

description: Over the past few years, certification schemes in the agribusiness sector have gained great importance as an instrument of quality assurance in the supply chain (Jahn et al. 2005; Fulponi2006; European Communities 2006a). Especially in the EU several standards have been established,which partially diverge extremely according to their focus, target groups and goals.While most of these systems have a rather low diffusion in the food sector (e. g. Label Rouge or Geprüfte Qualität Bayern), certification schemes such as QS, BRC, IFS or EurepGap already cover substantial parts and are widely known within the business (European Communities 2006a). However, the reputation and status which these systems have built up during the past few years, greatly depend on the confidence in meeting the promises of assuring quality and food issues. If the standard is unable to come up to the expectations of consumers and business partners, the value of such a scheme is easy to doubt and trust is going to fade (Fulponi 2006: 8). In consequence, the withdrawal of considerable parts of the supply chain could bring down the entire system. Aside from this effect, a certification scheme is always exposed to the interests of censorious stakeholders (e. g. consumer associations and NGOs) who generally have good connections to media and politics. In this case, even the rumour or accusation of flaws and scandals poses enormous problems for the reputation of the standard.
Interactions in Ireland's Food Innovation System
Creators: name: Buckley, Marie
name: Henchion, Maeve M.
name: O'Reilly, Paul
name: Buckley, Marie
name: Henchion, Maeve M.
name: O'Reilly, Paul
Publisher: name: Unknown
Year: 2007
Subjects: Agribusiness
Research and Development/Tech Change/Emerging Technologies

description: This paper presents an analysis of the Irish food innovation system. The research was conducted as part of a larger project aimed at developing a research commercialisation toolbox to assist public research organisations and universities improve technology transfer and commercialisation of publicly funded food research. Ireland’s food innovation system (FIS) is discussed for the first time to identify key actors, agencies and knowledge flows that contribute to food innovation nationally. Following a section in which a FIS is defined, an overview of the food industry and its research activities are presented to provide context for the current research and the discussion that follows. The methodology adopted for this research is then outlined with identification and discussion of the key actors in the FIS the focus of the next section. The main findings of the research are then presented, followed by conclusions and an outline of future research to be conducted on the Irish FIS.
Construction and solution of a Wannier-functions based Hamiltonian in the pseudopotential plane-wave framework for strongly correlated materials
Creators: name: Korotin, Dm.
name: Kozhevnikov, A. V.
name: Skornyakov, S. L.
name: Leonov, I.
name: Binggeli, N.
name: Anisimov, V. I.
name: Trimarchi, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ab initio determination of model Hamiltonian parameters for strongly correlated materials is a key issue in applying many-particle theoretical tools to real narrow-band materials. We propose a self-contained calculation scheme to construct, with an ab initio approach, and solve such a Hamiltonian. The scheme uses a Wannier-function-basis set, with the Coulomb interaction parameter U obtained specifically for these Wannier functions via constrained Density functional theory (DFT) calculations. The Hamiltonian is solved by Dynamical Mean-Field Theory (DMFT) with the effective impurity problem treated by the Quantum Monte Carlo (QMC) method. Our scheme is based on the pseudopotential plane-wave method, which makes it suitable for developments addressing the challenging problem of crystal structural relaxations and transformations due to correlation effects. We have applied our scheme to the "charge transfer insulator" material nickel oxide and demonstrate a good agreement with the experimental photoemission spectra.
Private Innovation and Public Innovation: Who Leads and Who Follows?
Creators: name: Arfini, Filippo
name: Cernicchiaro, Sabrina
name: Mancini, Maria Cecilia
name: Arfini, Filippo
name: Cernicchiaro, Sabrina
name: Mancini, Maria Cecilia
Publisher: name: Unknown
Year: 2007
Subjects: Agribusiness
Institutional and Behavioral Economics
Research and Development/Tech Change/Emerging Technologies

description: This paper examines two models of interaction between private and public institutions in respect to the process of innovation. While private firms adopt proactive strategies and public institutions follow it is considered that, under certain conditions, public institutions are the innovator and private firms are the followers. The first part of the research is theoretical and formulates the two models and their implications. The second part presents a case study of Italian products which have Animal Welfare (AW) attributes, where production follows the second relationship model. The case study shows that AW friendly products are the result of EU legislation, which obliges the industry to adapt production, organisation, publicity, communication and promotion. This is the inverse of the traditional relationship where private firms take the initiative.
DOING POLICY IN THE LAB! OPTIONS FOR THE FUTURE USE OF MODEL-BASED POLICY ANALYSIS FOR COMPLEX DECISION-MAKING
Creators: name: Happe, Kathrin
name: Balmann, Alfons
name: Happe, Kathrin
name: Balmann, Alfons
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Research Methods/ Statistical Methods
subject: modelling
subject: complexity
subject: participatory modelling
subject: policy analysis
subject: model use

description: For models to have an impact on policy-making, they need to be used. Exploring the relationships between policy models, model uptake and policy dynamics is the core of this article. What particular role can policy models play in the analysis and design of policies? Which factors facilitate (inhibit) the uptake of models by policy-makers? What are possible pathways to further develop modelling approaches to better meet the challenges facing agriculture today? In this paper, we address these issues from three different points of view, each of which should shed some light on the subject. The first point of view discusses models in the framework of complex adaptive systems and uncertainty. The second point of view looks at the dynamic interplay between policies and models using the example of modelling in agricultural economics. The third point of view addresses conditions for a successful application of models in policy analysis.
Technical Efficiency of the Crop Farms under the Various CAP Reforms: Empirical Studies for Germany, the Netherlands and Sweden
Creators: name: Zhu, Xueqin
name: Oude Lansink, Alfons G.J.M.
name: Zhu, Xueqin
name: Oude Lansink, Alfons G.J.M.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Farm Management
subject: Research and Development/Tech Change/Emerging Technologies
subject: technical efficiency
subject: the CAP reform
subject: frontier models
subject: crop farming

description: We analyse the impacts of the CAP reforms on the technical efficiency of the crop farms. We use an output distance function and an inefficiency effects model which incorporates the influences of exogenous variables on farm efficiency. We formulate policy variables (e.g. the CAP subsidies) and producer characteristics as explanatory variables in the inefficiency effects model. We use the 1995- 2004 FADN data to estimate the production frontiers of the crop farms in Germany, Netherlands and Sweden, to derive their technical efficiency, and to determine the effects of the explanatory variables. The study shows that the 10-year average technical efficiency of crop farms is 59% in Germany, 75% in Netherlands, and 70% in Sweden. The average annual technical efficiency change is 0.1%, 0.7% and 2.7% respectively for Germany, Netherlands and Sweden.
THE EFFECT OF THE NEW SINGLE FARM PAYMENT IN IRRIGATED AGRICULTURE: THE CASE OF SPAIN
Creators: name: Gracia, Azucena
name: De Magistris, Tiziana
name: Casado, Jose Maria
name: Gracia, Azucena
name: De Magistris, Tiziana
name: Casado, Jose Maria
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Land Economics/Use
subject: Research Methods/ Statistical Methods
subject: CAP reform
subject: partial equilibrium model
subject: policy modelling
subject: irrigated Agriculture
subject: simulation

description: The aim of the paper is to provide an econometric, dynamic, multi-product and partial equilibrium model for the Spanish agriculture able to analyse the effects of the SFP and subsequent reforms in both the irrigated and non-irrigated cultivation. In the case of the EU Mediterranean countries, irrigated agriculture is very relevant because farmers in irrigated land get higher productivity and returns. However, irrigation is also the source of a number of environmental concerns, such as over-abstraction of water from subterranean aquifers, irrigation driven erosion, soil salinisation, etc.. The new decoupling direct payments from production will reduce many of the incentives to intensive production. The developed model is called Spanish Econometric Simulation of Agricultural Policies (SESAP) and it is estimated using Eurotat data from 1983 to 2004 and solved using the GAMS software for the period 2005 to 2020. Simulation results indicate that irrigated area harvested for arable crops, less environmental friendly, is expected to decrease more than non-irrigated.
CREDIT MARKET IMPERFECTIONS AND THE DISTRIBUTION OF POLICY RENTS: THE COMMON AGRICULTURAL POLICY IN THE NEW EU MEMBER STATES
Creators: name: Ciaian, Pavel
name: Swinnen, Johan F.M.
name: Ciaian, Pavel
name: Swinnen, Johan F.M.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Land Economics/Use
subject: agricultural policy
subject: imperfect credit markets
subject: land market
subject: policy rents

description: This article analyses how credit market imperfections affect the impacts of subsidies by analyzing the effects of agricultural subsidies in the new Eastern Member States of the European Union with a partial equilibrium model which integrates credit and land market imperfections. We show that credit constraints have important implications for the distribution of policy rents. Credit market imperfections may induce very different effects of direct payments and lump-sum transfers.
DYNAMIC MICROECONOMETRIC APPROACHES TO ANALYSING AGRICULTURAL POLICY
Creators: name: Gardebroek, Cornelis
name: Oude Lansink, Alfons G.J.M.
name: Gardebroek, Cornelis
name: Oude Lansink, Alfons G.J.M.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Research Methods/ Statistical Methods
subject: Dynamics
subject: microeconometric models
subject: agricultural policy analysis

description: Micro-econometric models have become a standard and powerful tool in analysing agricultural policies. In this paper we assess the contributions that have been made in the agricultural economics literature to dynamic microeconometric models of firms and households that are estimated using microdata. After discussing developments in dynamic investment models, dynamic household models, dynamic discrete choice models and dynamic efficiency models we give promising directions for future research and discuss implications for future data collection.