cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum limit to subdiffraction incoherent optical imaging. II. A parametric-submodel approach
Creators: name: Tsang, Mankei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In a previous paper [M. Tsang, Phys. Rev. A 99, 012305 (2019)], I proposed a quantum limit to the estimation of object moments in subdiffraction incoherent optical imaging. In this sequel, I prove the quantum limit rigorously by infinite-dimensional analysis. A key to the proof is the choice of an unfavorable parametric submodel to give a bound for the semiparametric problem. By generalizing the quantum limit for a larger class of moments, I also prove that the measurement method of spatial-mode demultiplexing (SPADE) with just one or two modes is able to achieve the quantum limit. For comparison, I derive a classical bound for direct imaging using the parametric-submodel approach, which suggests that direct imaging is substantially inferior.
description: 17 pages, 4 figures. v4: corrected minor typos. Published
Continued fractions and transcendental numbers
Creators: name: Adamczewski, Boris
name: Bugeaud, Yann
name: Davison, Les J. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11J81, 11J70, 68R15

description: It is widely believed that the continued fraction expansion of every irrational algebraic number $α$ either is eventually periodic (and we know that this is the case if and only if $α$ is a quadratic irrational), or it contains arbitrarily large partial quotients. Apparently, this question was first considered by Khintchine. A preliminary step towards its resolution consists in providing explicit examples of transcendental continued fractions. The main purpose of the present work is to present new families of transcendental continued fractions with bounded partial quotients. Our results are derived thanks to new combinatorial transcendence criteria recently obtained by Adamczewski and Bugeaud.
MPEC 2024-A124 : DAILY ORBIT UPDATE (2024 January 11)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
SPECIFICATION SELECTION ISSUES IN MULTIVARIATE THRESHOLD AND SWITCHING MODELS
Creators: name: Serra, Teresa
name: Goodwin, Barry K.
name: Serra, Teresa
name: Goodwin, Barry K.
Publisher: name: Unknown
Year: 2002
Subjects: Research Methods/ Statistical Methods

description: In this paper we consider two general approaches to the selection of thresholds in multivariate threshold models. The first criteria ignores the cross equation correlation while the latter explicitly accounts for it. We focus on how model selection may be influenced by these alternative approaches and consider simulations of the alternative approaches.
title: Sovranità e diritti al tempo della globalizzazione
Creators: name: Contaldi, Gianluca
Publisher: name: Roma TrE-Press
Year: 2021

description: Cosa si intenda per globalizzazione è tuttora oggetto di disputa tra giuristi, economisti e sociologici. In quest’epoca di profonda crisi della globalizzazione, almeno nella sua accezione economica, il volume si propone di cercare di ridefinirne la nozione alla luce dei concetti giuridici fondamentali. Gli scritti raccolti nel volume si propongono di descrivere la nascita delle costituzioni democratiche, di ridefinire i rapporti tra ordinamento internazionale e interno, di sondare l’effettività dei meccanismi di giustizia previsti dagli strumenti internazionali nel diritto amministrativo globale, di valutare la rispondenza del costituzionalismo globale ad una costruzione giuridica positivistica. Gli scritti prescindono dal peculiare momento storico, in quanto mirano a ricostruire la nascita e la crisi del processo di globalizzazione sotto varie prospettive storico-giuridiche.
Monte Carlo Algorithm for Least Dependent Non-Negative Mixture Decomposition
Creators: name: Astakhov, Sergey A.
name: Stögbauer, Harald
name: Kraskov, Alexander
name: Grassberger, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Information Theory (cs.IT)
subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: Computational Physics (physics.comp-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We propose a simulated annealing algorithm (called SNICA for "stochastic non-negative independent component analysis") for blind decomposition of linear mixtures of non-negative sources with non-negative coefficients. The de-mixing is based on a Metropolis type Monte Carlo search for least dependent components, with the mutual information between recovered components as a cost function and their non-negativity as a hard constraint. Elementary moves are shears in two-dimensional subspaces and rotations in three-dimensional subspaces. The algorithm is geared at decomposing signals whose probability densities peak at zero, the case typical in analytical spectroscopy and multivariate curve resolution. The decomposition performance on large samples of synthetic mixtures and experimental data is much better than that of traditional blind source separation methods based on principal component analysis (MILCA, FastICA, RADICAL) and chemometrics techniques (SIMPLISMA, ALS, BTEM) The source codes of SNICA, MILCA and the MI estimator are freely available online at http://www.fz-juelich.de/nic/cs/software
FARM SAFETY NET: SUBSIDIZED SAVINGS ACCOUNT FOR U.S. FARMERS
Creators: name: Worth, Thomas
name: Makki, Shiva S.
name: Somwaru, Agapi
name: Worth, Thomas
name: Makki, Shiva S.
name: Somwaru, Agapi
Publisher: name: Unknown
Year: 2002
Subjects: Agricultural Finance

description: A subsidized savings accounts program is being considered by USDA's Risk Management Agency to provide an income safety net to farmers. We argue that savings accounts would complement federal crop insurance program and other private risk management strategies that farmers routinely adopt to minimize income risk and hence offer a better safety net.
Scaling relations of Fuzzy Dark Matter haloes I: individual systems in their cosmological environment
Creators: name: Nori, Matteo
name: Baldi, Marco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Dark matter models involving a very light bosonic particle, generally known as Fuzzy Dark Matter (FDM), have been recently attracting great interest in the cosmology community, as their wave-like phenomenology would simultaneously explain the longstanding mis-detection of a dark matter particle and help easing the small-scale issues related to the standard Cold Dark Matter (CDM) scenario. With the present work, we initiate a series of papers aiming at investigating the evolution of FDM structures in a cosmological framework performed with our N-body code AX-GADGET, detailing for the first time in the literature how the actual scaling relations between solitonic cores and host haloes properties are significantly affected by the dynamical state, morphology and merger history of the individual systems. In particular, in this first paper we confirm the ability of AX-GADGET to correctly reproduce the typical FDM solitonic core and we employ it to study the non-linear evolution of eight FDM haloes in their cosmological context through the zoom-in simulation approach. We find that the scaling relations identified in previous works for isolated systems are generally modified for haloes evolving in a realistic cosmological environment, and appear to be valid only as a limit for the most relaxed and spherically symmetric systems.
description: 20 pages, 9 Figures, 4 Tables. Submitted to MNRAS
Italiaander, Rolf (Hrsg.), Die Gefährdung der Religionen ...
Creators: name: Schulz, Otmar
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 16 Nr. 3 (1967): Ökumenische Rundschau, Band 16, Heft 3
Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude
Creators: name: Friedman, E.
name: Bauer, M.
name: Breitschopf, J.
name: Clement, H.
name: Denz, H.
name: Doroshkevich, E.
name: Erhardt, A.
name: Hofman, G. J.
name: Kritchman, S.
name: Meier, R.
name: Wagner, G. J.
name: Yaari, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Measurements of elastic scattering of 21.5 MeV pi+ and pi- by Si, Ca, Ni and Zr were made using a single arm magnetic spectrometer. Absolute calibration was made by parallel measurements of Coulomb scattering of muons. Parameters of a pion-nucleus optical potential were obtained from fits to all eight angular distributions put together. The `anomalous' s-wave repulsion known from pionic atoms is clearly observed and could be removed by introducing a chiral-motivated density dependence of the isovector scattering amplitude, which also greatly improved the fits to the data. The empirical energy dependence of the isoscalar amplitude also improves the fits to the data but, contrary to what is found with pionic atoms, on its own is incapable of removing the anomaly.
description: 20 pages, 5 figures, 5 tables. V2 added details on uncertainties,extended discussion. To appear in PRC
Null Kähler geometry and isomonodromic deformations
Creators: name: Dunajski, Maciej
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We construct the normal forms of null-Kähler metrics: pseudo-Riemannian metrics admitting a compatible parallel nilpotent endomorphism of the tangent bundle. Such metrics are examples of non-Riemannian holonomy reduction, and (in the complexified setting) appear in the Bridgeland stability conditions of the moduli spaces of Calabi-Yau three-folds. Using twistor methods we show that, in dimension four - where there is a connection with dispersionless integrability - the cohomogeneity-one anti-self-dual null-Kähler metrics are generically characterised by solutions to Painlevé I or Painlevé II ODEs.
description: Dedicated to Jenya Ferapontov on the occasion of his 60th birthday. Final version, to appear in Communications In Math Physics
Memories
Creators: name: Kirby, G.E.
Publisher: name: The University of British Columbia
Year: 2015

description: The memoirs of a young English woman, describing her experiences as a tutor of two daughters of a Russian artistocrat from 1879 to 1883. She descriibes her travels and experiences with her host family, the Alexeiffs, through Russia and elsewhere in Europe. She documented the lives of the 19th century Russian aristocracy, and touches on historical events and her hosts' reactions to them such as the assassination of Czar Alexander II in March 1881. She concluded here memoir with a brief description of the fate of the Alexieffs during and after the Russian Revolution.
PROVIDING EQUITABLE SPATIAL DISTRIBUTION OF PROTECTED NATURAL AREAS IN A METROPOLITAN SETTING: AN APPLICATION OF THE LOCATION SET-COVERING PROBLEM
Creators: name: Ruliffson, Jane A.
name: Haight, Robert G.
name: Homans, Frances R.
name: Gobster, Paul H.
name: Ruliffson, Jane A.
name: Haight, Robert G.
name: Homans, Frances R.
name: Gobster, Paul H.
Publisher: name: Unknown
Year: 2002
Subjects: Land Economics/Use

description: We use the location set covering problem to define a natural area site selection model for use in the Chicago region. This framework allows us to explicitly consider the equity of site distribution by stipulating that each population center has access to a recreational space within a specified distance.
Local starburst conditions and formation of GRB 980425 / SN 1998bw within a collisional ring
Creators: name: Arabsalmani, M.
name: Renaud, F.
name: Roychowdhury, S.
name: Arumugam, V.
name: Floc'h, E. Le
name: Bournaud, F.
name: Cormier, D.
name: Zwaan, M. A.
name: Christensen, L.
name: Pian, E.
name: Madden, S.
name: Levan, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the first spatially resolved study of molecular gas in the vicinity of a Gamma Ray Burst, using CO(2-1) emission line observations with the Atacama Large Millimetre Array (ALMA) at ~50 pc scales. The host galaxy of GRB 980425 contains a ring of high column density HI gas which is likely to have formed due to a collision between the GRB host and its companion galaxy, within which the GRB is located. We detect eleven molecular gas clumps in the galaxy, seven of which are within the gas ring. The clump closest to the GRB position is at a projected separation of ~280 pc. Although it is plausible that the GRB progenitor was ejected from clusters formed in this clump, we argue that the in situ formation of the GRB progenitor is the most likely scenario. We measure the molecular gas masses of the clumps and find them to be sufficient for forming massive star clusters. The molecular gas depletion times of the clumps show a variation of ~2 dex, comparable with the large variation in depletion times found in starburst galaxies in the nearby Universe. This demonstrates the presence of starburst modes of star formation on local scales in the galaxy, even while the galaxy as a whole cannot be categorised as a starburst based on its global properties. Our findings suggest that the progenitor of GRB 9802425 was originated in a young massive star cluster formed in the starburst mode of star formation.
description: ApJ (in press), 12 pages, 4 figures, 1 table
ANEC in $λ\, ϕ^4$ theory
Creators: name: Bautista, Teresa
name: Casarin, Lorenzo
name: Godazgar, Hadi
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by the goal of applying the average null energy condition (ANEC) to renormalisation group flows, we calculate in $λϕ^4$ theory the expectation value of the ANEC operator in a particular scalar state perturbatively up to third order in the quartic coupling and verify the expected CFT answer. The work provides the technical tools for studying the expectation value of the ANEC operator in more interesting states, for example tensorial states relevant to the Hofman-Maldacena collider bounds, away from critical points.
description: Interpretation of the result is corrected, abstract modified accordingly. Comments and references added. 22 pages, no figures
CONSERVATION CAPITAL AND SUSTAINABLE ECONOMIC GROWTH
Creators: name: Ramirez, Donna Theresa J.
name: Khanna, Madhu
name: Zilberman, David
name: Ramirez, Donna Theresa J.
name: Khanna, Madhu
name: Zilberman, David
Publisher: name: Unknown
Year: 2002
Subjects: Environmental Economics and Policy
International Development

description: This paper develops an endogenous growth model which links pollution to ineffective input-use, which can be reduced through conservation capital investment. It derives the conditions under which individual preferences for environmental quality and private investment in conservation capital can lead to non-decreasing environmental quality and balanced growth in an unregulated and in a regulated regime. In the absence of regulation, balanced growth can lead to improvement in environmental quality as long as the rate of growth is low. The extent to which the growth rate is low depends upon preference for environmental quality, interest and discount rates, productivity of conservation capital, and price of the polluting input. Under an emissions tax regime, sustainable balanced growth requires the interest rate to lie between the amenity value derived by consumers from environmental improvement and the marginal return to the firm due to the regenerative capacity of the environment. This implies that interest rate must be high enough to encourage consumers to forego consumption but low enough to constrain the productivity of conservation capital and restrain usage of the polluting input. The emissions tax is also shown to be equivalent to a pollution permit system or to a two-instrument scheme composed of a tax on polluting input and a subsidy on conservation capital investment.
ALMA resolves molecular clouds in the metal poor Magellanic Bridge A
Creators: name: Valdivia-Mena, M. T.
name: Rubio, M.
name: Bolatto, A. D.
name: Saldaño, H. P.
name: Verdugo, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged)We characterize gas and dust emission in Magellanic Bridge A, which has the highest 870$μ$m excess of emission found in single dish surveys. Using the ALMA telescope, we mapped the Magellanic Bridge A molecular cloud with sub-parsec resolution, in 1.3 mm continuum and CO(2-1) line emission. We also map the cloud in 870$μ$m continuum and CO(2-1) line emission at ~6 pc resolution with APEX. We combine the ALMA and APEX CO(2-1) line cubes to study the molecular gas emission. Magellanic Bridge A breaks up into two distinct molecular clouds in dust and CO(2-1) emission, which we call North and South. Dust emission in the North source, according to our best parameters from fitting the far-infrarred fluxes, is ~3 K colder than in the South source in correspondence to its less developed star formation. Both dust sources present large submillimeter excesses in LABOCA data: according to our best fits the excess over the modified blackbody (MBB) fit to the Spitzer/Herschel continuum are ~7 and ~3 for the North and South sources respectively. Nonetheless, we do not detect the corresponding 1.3 mm continuum with ALMA. Our limits are compatible with the extrapolation of the MBB fits and therefore we cannot independently confirm the excess at this longer wavelength. The CO(2-1) emission is in two parsec-sized clouds with virial masses around 400 and 700 Mo each. Their volume densities are ~700-2600 cm$^{-3}$, larger than typical bulk densities of Galactic molecular clouds. The CO-to-H2 conversion factor is 6.5 and 15 M$_{\odot}$ (K km s$^{-1}$ pc$^2$)$^{-1}$ for the North and South clouds, calculated using their respective virial masses and CO(2-1) luminosities. Gas mass estimates from our MBB fits to dust emission yields masses $M\sim1.3\times10^3$ M$_{\odot}$ and $2.9\times10^3$ M$_{\odot}$ for North and South respectively, a factor ~4 larger than the virial masses we infer from CO.
description: Astronomy & Astrophysics in press. 14 pages, 6 figures, 7 tables
An RNA secondary structure regulates sxy expression and competence development in haemophilus influenzae
Creators: name: Bannister, Laura Anne
Publisher: name: University of British Columbia
Year: 2009

description: The process of natural transformation is the ability of cells to take up DNA from their environment and recombine this DNA into their genome to yield stable inheritance of an altered genotype. In Haemophilus influenzae, competence for transformation is tightly regulated, and is induced to maximal levels when cells undergo nutrient limitation. One signal for competence development is a rise in concentration of intracellular cAMP. A second proposed signal is an increase in the concentration of Sxy, a protein that appears to activate competence by regulating the expression of other competence genes. In this thesis, I examined the evolution and expression of sxy, focusing on whether the function of Sxy is specific to competence development, and whether the pattern of expression of sxy is consistent with competence being controlled by levels of Sxy within the cell. I found potential Sxy homologs in both transformable and nontransformable bacteria, indicating that Sxy may have a function that is unrelated to competence development. Neither Sxy nor any of its homologs contain amino acid motifs that share similarity with those of known transcription factors; therefore, my results do not confirm the hypothesis that Sxy directly activates transcription of competence genes. Sxyv.lacZ reporter gene analysis indicates that sxy expression is increased within cells well before maximum competence development in rich medium, suggesting that an increase in Sxy concentration is not the limiting step of competence development. Reporter gene analysis also indicates that maximal amounts of Sxy are not any higher in starvation medium than in rich medium, suggesting that an increase in Sxy concentration is not the second, cAMP-independent signal that increases the competence of cells in starvation medium relative to those in rich medium. Finally, I suggest that sxy may be regulated at the translational level, perhaps by the inhibition of translation by an mRNA secondary structure that had been previously proposed. I confirmed the existence of this secondary structure, using both in vivo and in vitro experiments. In this thesis, I also discuss attempts to find repressors of competence following H. influenzae mutagenesis with Tn926. Although I did not recover any such mutants, I did recover mutants in the fis operon of H. influenzae that have delayed spontaneous competence, and further experiments showed that fis null mutants have transformation frequencies in rich medium that are reduced - 500-fold relative to wild type cells. I suggest some ways in which Fis may be involved in natural transformation.
LINEAR FEEDBACK BETWEEN EUROPEAN WHEAT EXPORT REFUNDS AND WORLD WHEAT PRICES
Creators: name: Roeber, Ronald
name: Roeber, Ronald
Publisher: name: Unknown
Year: 2002
Subjects: International Relations/Trade

description: This paper explores the dynamic relationships between European Union (EU) wheat export restitution awards and price movements in the world wheat market from November 20, 1986 through April 24, 1998. This study pairs the results of weekly EU open market tenders and corresponding foreign wheat export prices in a series of bivariate non-structural. From these models a feedback measure is calculated which estimates the contribution of innovations in wheat prices to the variance in export tenders and vice versa. Feedback was decomposed into patterns - short-term and long-term - that approximate patterns of strategic behavior or political strategy. The study showed overall feedback and short-term innovations in wheat export prices and European restitution awards are relatively small. As the length of the feedback decomposition increases directional feedback diverges. The importance of export price changes to European restitution awards increases in long-run relationships. In contrast weekly EU restitution awards decrease in their importance to wheat export price changes as decomposition periods increase. The general pattern found in the study seem to indicate that world export prices contribute substantially to long-term variations in EU open market tender awards, while these awards appear to have negligible effects on long-term international wheat price determination. Short-run and long-run feedback results provide evidence in support of an international wheat market that is minimally influenced by the administration of EU export subsidies. The long-term conduct of European wheat export policy appears to have been influenced to some degree by the international wheat market.
AutoAtlas: Neural Network for 3D Unsupervised Partitioning and Representation Learning
Creators: name: Mohan, K. Aditya
name: Kaplan, Alan D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We present a novel neural network architecture called AutoAtlas for fully unsupervised partitioning and representation learning of 3D brain Magnetic Resonance Imaging (MRI) volumes. AutoAtlas consists of two neural network components: one neural network to perform multi-label partitioning based on local texture in the volume, and a second neural network to compress the information contained within each partition. We train both of these components simultaneously by optimizing a loss function that is designed to promote accurate reconstruction of each partition, while encouraging spatially smooth and contiguous partitioning, and discouraging relatively small partitions. We show that the partitions adapt to the subject specific structural variations of brain tissue while consistently appearing at similar spatial locations across subjects. AutoAtlas also produces very low dimensional features that represent local texture of each partition. We demonstrate prediction of metadata associated with each subject using the derived feature representations and compare the results to prediction using features derived from FreeSurfer anatomical parcellation. Since our features are intrinsically linked to distinct partitions, we can then map values of interest, such as partition-specific feature importance scores onto the brain for visualization.
description: IEEE Journal of Biomedical and Health Informatics
Transition Radiation Spectra of Electrons from 1 to 10 GeV/c in Regular and Irregular Radiators
Creators: name: Andronic, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present measurements of the spectral distribution of transition radiation generated by electrons of momentum 1 to 10 GeV/c in different radiator types. We investigate periodic foil radiators and irregular foam and fiber materials. The transition radiation photons are detected by prototypes of the drift chambers to be used in the Transition Radiation Detector (TRD) of the ALICE experiment at CERN, which are filled with a Xe, CO2 (15 %) mixture. The measurements are compared to simulations in order to enhance the quantitative understanding of transition radiation production, in particular the momentum dependence of the transition radiation yield.
description: 18 pages, 15 figures, submitted to Nucl. Instr. Meth. Phys. Res. A
A NEW APPROACH TO CONTINGENT VALUATION FOR ASSESSING THE COSTS OF LIVING WITH WILDLIFE IN DEVELOPING COUNTRIES
Creators: name: Sutton, William R.
name: Larson, Douglas M.
name: Jarvis, Lovell S.
name: Sutton, William R.
name: Larson, Douglas M.
name: Jarvis, Lovell S.
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: This paper describes the first use of a methodology based on a utility-theoretic behavioral model to simultaneously estimate a household's WTP for a non-market good in both money and a non-monetary numeraire good. WTP by subsistence farmers in Namibia for deterrents to wildlife attacks on crops and livestock is estimated.
Geometric and Combinatorial Realizations of Crystals of Enveloping Algebras
Creators: name: Savage, Alistair
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G20, 17B37

description: Kashiwara and Saito have defined a crystal structure on the set of irreducible components of Lusztig's quiver varieties. This gives a geometric realization of the crystal graph of the lower half of the quantum group associated to a simply-laced Kac-Moody algebra. Using an enumeration of the irreducible components of Lusztig's quiver varieties in finite and affine type A by combinatorial data, we compute the geometrically defined crystal structure in terms of this combinatorics. We conclude by comparing the combinatorial realization of the crystal graph thus obtained with other combinatorial models involving Young tableaux and Young walls.
description: 12 pages
TREATMENT OF INCOMPLETE AND MISSING COVARIATE INFORMATION IN A BAYESIAN GENERALIZED LINEAR MODEL OF MARINE RECREATIONAL ANGLER'S CHOICE OF FISHING SITE
Creators: name: Graybeal, Dale K.
name: Graybeal, Dale K.
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: Economic surveys often report income via a categorical variable, and income and wage information is often missing altogether for a large fraction of the sample. The Bayesian inferential framework allows one to specify and estimate models for incomplete and missing covariate information. Here multiple choice models of recreational anglers' choice of fishing site are estimated and alternative specifications for incomplete and missing income and wage data are compared.
Existence and Instability of Novel Hairy Black Holes in Shift-symmetric Horndeski Theories
Creators: name: Khoury, Justin
name: Trodden, Mark
name: Wong, Sam S. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Shift-symmetric Horndeski theories admit an interesting class of Schwarzschild black hole solutions exhibiting time-dependent scalar hair. By making use of Lemaître coordinates, we analyze perturbations around these types of black holes, and demonstrate that scalar perturbations around black hole backgrounds inevitably have gradient instabilities. Taken together with previously established results, this newly-discovered instability rules out black holes with time-dependent scalar hair in Horndeski theories.
description: 25 pages
Electroweak corrections to charged-current e+e- --> 4 fermion processes - technical details and further results
Creators: name: Denner, A.
name: Dittmaier, S.
name: Roth, M.
name: Wieders, L. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The complete electroweak O(alpha) corrections have been calculated for the charged-current four-fermion production processes e+e- --> nu_tau tau+ mu- anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c. Here, technical details of this calculation are presented. These include the algebraic reduction of spinor chains to a few standard structures and the consistent implementation of the finite width of the W boson. To this end, a generalization of the complex-mass scheme to the one-loop level is proposed, and the practical application of this method is described. Finally, the effects of the complete O(alpha) corrections to various differential cross sections of physical interest are discussed and compared to predictions based on the double-pole approximation, revealing that the latter approximation is not sufficient to fully exploit the potential of a future linear collider in an analysis of W-boson pairs at high energies.
description: 52 pages, latex, 28 postscript figures, error in implementation of complex-mass scheme corrected, relative corrections shifted by 0.4-0.5%, description of complex-mass scheme improved
title: Methodik zur datenbasierten Typisierung von Quartieren anhand baulicher Strukturen
Creators: name: Müller, André
Publisher: name: UNSPECIFIED
Year: 2024

description: Die deutsche Gesellschaft befindet sich in einem Transformationsprozess, um der Klimakrise zu begegnen. Vor dem Hintergrund der notwendigen Dekarbonisierung der Wärmeversorgung von Gebäuden haben sich Konzepte etabliert, welche für Quartiere, d. h. mehrere Gebäude in einem räumlichen Zusammenhang, die Reduktion von Treibhausgasemissionen durch eine Erhöhung der Gebäude- und Anlageneffizienz sowie durch die Einbindung erneuerbarer Energieträger erreichen. Während auf lokaler Handlungsebene eine Vielzahl an Projekten umgesetzt wird, fehlte die empirische Basis, um die Art und Anzahl von Quartieren in Deutschland zu erfassen und die Wirkung von Quartierskonzepten in Hoch- und Szenarienrechnungen zum Klimaschutz zu integrieren.
Die vorliegende Arbeit liefert eine Methodik zur Nutzung von Geobasisdaten für eine Analyse der Bebauungsstruktur und eine Einteilung dieser in geometrisch-topologisch ähnliche Gebiete mittels Clusteranalyse. Eine Vereinigung benachbarter Gebiete ähnlicher Bebauung führt im Anschluss zur Bildung von Quartieren, was schließlich eine statistische Analyse des Quartiersbestandes erlaubt. Daraus können Kenngrößen für die Beschreibung von Typvertretern für Quartiersgruppen, sogenannte Typquartiere, festgelegt werden. Die beispielhafte Anwendung der Methodik am Datensatz Berlins zeigt eine praxisgerechte Quartiersbildung sowie die Verwendbarkeit der Ergebnisse der Quartierstypisierung für vielfältige Forschungs- und Planungszwecke. Insbesondere eine Verwendung des nationalen Geodatenbestandes zur Quartierstypisierung eröffnet die Möglichkeit weiterführender Szenarioanalysen im Kontext nationaler Klimaschutzstrategien.
Supertrace and superquadratic Lie structure on the Weyl algebra, with applications to formal inverse Weyl transform
Creators: name: Pinczon, Georges
name: Ushirobira, Rosane
Publisher: name: arXiv
Year: 2005
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 53D55, 17B05, 17B10, 17B20, 17B60, 17B65

description: Using the Moyal *-product and orthosymplectic supersymmetry, we construct a natural non trivial supertrace and an associated non degenerate invariant supersymmetric bilinear form for the Lie superalgebra structure of the Weyl algebra. We decompose adjoint and twisted adjoint actions. We define a renormalized supertrace and a formal inverse Weyl transform in a deformation quantization framework and develop some examples.
description: 26 pages; v1: added a reference, corrected typos; v2: changed title, added a reference, typos fixed
Το δεδικασμένο στα κατ’ εξακολούθηση εγκλήματα
Creators: name: Σεΐσογλου Μαρία Χαραλάμπους
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Δεδικασμένο
Εξακολούθηση
Ταυτότητα Πράξης
Res Judicata
Recurrent Crimes
Identity of Act

description: Σκοπός της διατριβής ήταν να αναλυθεί ο τρόπος με τον οποίο η ιδιαίτερη φύση των κατ’ εξακολούθηση τελουμένων εγκλημάτων αντικατοπτρίζεται δικονομικά στο πεδίο του δεδικασμένου. Αρχικά, λοιπόν, παρουσιάσθηκαν οι επιμέρους θεωρίες σχετικά με την πολλαπλότητα ή την μοναδικότητα της εγκληματικής πράξης στις περιπτώσεις των κατ’ εξακολούθηση εγκλημάτων, αλλά και σχετικά με την μορφή δόλου από τον οποίο η πράξη πρέπει να καλύπτεται. Επιπλέον, συγκεντρώθηκαν οι διαφορετικές θεωρητικές και νομολογιακές απόψεις που αφορούν τον ορισμό του αντικειμένου της ποινικής δίκης και κυρίως της ταυτότητας της πράξης, που αποτελεί όρο του δεδικασμένου. Από τον συνδυασμό των παραπάνω λογικά προέκυψε ότι όσο ευρύτερα ορίζεται η πράξη, τόσο αναιρείται η αυτοτέλειά των επιμέρους εξακολουθητικών εγκλημάτων κι έτσι διευρύνονται τα όρια του δεδικασμένου. Μελετήθηκαν, δε, και οι θέσεις επιφανών θεωρητικών επί του ζητήματος του δεδικασμένου στα κατ΄εξακολούθηση εγκλήματα, ενώ η διατριβή ολοκληρώθηκε με αναλυτική αναφορά στη στάση των δικαστηρίων
description: The aim of the present thesis was the analysis of the way in which the particular nature of recurrent crimes is procedurally reflected in the field of res judicata. In the first place, aliquot theories were presented regarding either the plurality or singularity of the criminal act in the case of recurrent crimes, as well as regarding the kind of intention the perpetrator needs to have. Furthermore, varying theoretical and jurisdictional aspects related to the definition of the criminal litigation’s object were compiled, those referring to the identity of the act -a prerequisite for the establishment of res judicata- being of principal interest. A critical combination of all the above led to the conclusion; " The more broadly we choose to define an act, the more the autonomy of the recurrent crime is overturned, thus expanding the limits of res judicata. ". The opinions of eminent theoreticians on the topic of res judicata in the case of recurrent crimes were studied, while the thesis was concluded with an expatiation of the stance of the courts of law on the matter
Diagnóstico O Metal Portugal e as Empresas Familiares. O Empreendedorismo na Empresa e na Família. A Influência da Mulher na Empresa Familiar.
Creators: name: Costa, Antonio Nogueira Da
name: Girão, João
Publisher: name: figshare
Year: 2019
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business
subject: 150304 Entrepreneurship
subject: 150305 Human Resources Management
subject: 150314 Small Business Management

description: O Conceito e desenvolvimento do Empreendedorismo na Famílias Empresária e na Empresa Familiar.O papel mais ativo na Mulher na Empresa. 4 de 5 ebooks.Financiamento do Norte 2020 e Portugal 2020.Projeto “Metal – Gerando o Futuro” – Candidatura Norte – 02 – 0853 – FEDER 000125 Programa Operacional Regional do Norte, Eixo Prioritário I. Concurso NORTE 53 – 2016-07: Qualificação
Space-VLBI Polarimetry of the BL Lac Object S5 0716+714: Rapid Polarization Variability in the VLBI core
Creators: name: Bach, U.
name: Krichbaum, T. P.
name: Kraus, A.
name: Witzel, A.
name: Zensus, J. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: To determine the location of the intra-day variable (IDV) emission region within the jet of the BL Lac object S5 0716+714, a multi-epoch VSOP polarization experiment was performed in Autumn 2000. To detect, image, and monitor the short term variability of the source, three space-VLBI experiments were performed with VSOP at 5 GHz, separated in time by six days and by one day. Quasi-contemporaneous flux density measurements with the Effelsberg 100 m radio telescope during the VSOP observations revealed variability of about 5% in total intensity and up to 40% in linear polarization in less than one day. Analysis of the VLBI data shows that the variations are located inside the VLBI core component of 0716+714. In good agreement with the single-dish measurements, the VLBI ground array images and the VSOP images, both show a decrease in the total flux density of ~20 mJy and a drop of ~5 mJy in the linear polarization of the VLBI core. During the observing interval, the polarization angle rotated by about 15 degrees. No variability was found in the jet. The high angular-resolution VSOP images are not able to resolve the variable component and set an upper limit of <0.1 mas to the size of the core component. From the variability timescales we estimate a source size of a few micro-arcseconds and brightness temperatures exceeding 10^15 K. We discuss the results in the framework of source-extrinsic (interstellar scintillation induced) and source-intrinsic IDV models.
description: 15 pages, 10 figures, A&A in press, minor language editing to match the final version
ARE CROP YIELDS NORMALLY DISTRIBUTED?
Creators: name: Ramirez, Octavio A.
name: Misra, Sukant K.
name: Field, James E.
name: Ramirez, Octavio A.
name: Misra, Sukant K.
name: Field, James E.
Publisher: name: Unknown
Year: 2001
Subjects: subject: Crop Production/Industries
subject: Yield non-normality
subject: probability distribution function models
subject: Corn Belt yields
subject: West Texas dryland cotton yields

description: This paper revisits the issue of crop yield distributions using improved model specifications, estimation and testing procedures that address the methodological concerns raised in recent literature that could have invalidated previous conclusions of yield non-normality. It shows beyond reasonable doubt that some crop yield distributions are non-normal, kurtotic and right or left skewed, depending on the circumstances. A procedure to jointly estimate non-normal farm- and aggregate-level yield distributions with similar means but different variances is illustrated, and the consequences of incorrectly assuming yield normality are explored.
A General Bayesian Framework for Foreground Modelling and Chromaticity Correction for Global 21cm Experiments
Creators: name: Anstey, Dominic
name: Acedo, Eloy de Lera
name: Handley, Will
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The HI 21cm absorption line is masked by bright foregrounds and systematic distortions that arise due to the chromaticity of the antenna used to make the observation coupling to the spectral inhomogeneity of these foregrounds. We demonstrate that these distortions are sufficient to conceal the 21cm signal when the antenna is not perfectly achromatic and that simple corrections assuming a constant spatial distribution of foreground power are insufficient to overcome them. We then propose a new physics-motivated method of modelling the foregrounds of 21cm experiments in order to fit the chromatic distortions as part of the foregrounds. This is done by generating a simulated sky model across the observing band by dividing the sky into $N$ regions and scaling a base map assuming a distinct uniform spectral index in each region. The resulting sky map can then be convolved with a model of the antenna beam to give a model of foregrounds and chromaticity parameterised by the spectral indices of the $N$ regions. We demonstrate that fitting this model for varying $N$ using a Bayesian nested sampling algorithm and comparing the results using the evidence allows the 21cm signal to be reliably detected in data of a relatively smooth conical log spiral antenna. We also test a much more chromatic conical sinuous antenna and find this model will not produce a reliable signal detection, but in a manner that is easily distinguishable from a true detection.
description: 20 pages, 18 figures
AGRICULTURAL PRODUCTIVITY ASSESSMENT IN EUROPEAN COUNTRIES
Creators: name: Serrao, Amilcar
name: Serrao, Amilcar
Publisher: name: Unknown
Year: 2001
Subjects: Productivity Analysis

description: This research work examines levels and trends in global agricultural productivity in fifteen European Union countries and four Eastern European countries that have already applied for European Union membership. The study makes use of data collected from the Food and Agriculture Organization of the United Nations and covers the period 1980-1998. An approach based on Data Envelopment Analysis is used to provide information on the peers of the (inefficient) i-th country and to derive the Malmquist productivity indices. This approach is chosen due to the non-availability of reliable input price data to measure total factor productivity change, technical efficiency change and technical change. Model results show France, Bel-Lux and Italy are on the frontier technology in the period of study. Although Bulgaria and Hungary do not belong to the European Union, these countries are on the frontier technology, too. These results also show that France posts the most spectacular performance, while the Eastern European region is the major performer region and the Mediterranean region is the weakest performer region over the period of study. These results indicate that technical efficiency is not a source of total factor productivity growth. Another interesting result is that there is not a degree of catch-up due to improved technical efficiency along with growth in technical change in European Union Countries and four Eastern European countries.
Counterpropagating dipole-mode vector soliton
Creators: name: Schroeder, Jochen
name: Jander, Philip
name: Denz, Cornelia
name: Richter, Tobias
name: Motzek, Kristian
name: Kaiser, Friedemann
Publisher: name: arXiv
Year: 2005
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We experimentally observe a counterpropagating dipole-mode vector soliton in a photorefractive SBN:60Ce crystal. We investigate the transient formation dynamics and show that the formation process differs significantly from the copropagating geometry. The experimental results are compared with fully anisotropic numerical simulations which show good qualitative agreement.
description: 4 pages, 4 figures
The Emerging Roles of County Governments in Rural America: Findings from a Recent National Survey
Creators: name: Kraybill, David S.
name: Lobao, Linda
name: Kraybill, David S.
name: Lobao, Linda
Publisher: name: Unknown
Year: 2001
Subjects: Public Economics

description: County governments are the fastest growing level of local government in the United States. Based on a recent survey of counties in 45 states, this paper analyzes the size of county governments relative to other local governments, the scope of county government services, and fiscal stress faced by county governments.
Calculation of two-photon exchange effects for $Δ$ production in electron-proton collisions
Creators: name: Kondratyuk, S.
name: Blunden, P. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present an evaluation of a two-photon exchange correction to the cross section for unpolarized $Δ$ isobar production in electron-proton collisions, using a relativistic, crossing symmetric and gauge invariant approach. The calculated box and crossed-box diagrams include nucleon and $Δ$ intermediate states. We find a relation between the angular nonlinearity of the two-photon exchange contribution and the value of the $γΔΔ$ coupling constant.
description: 10 pages, 2 figures, RevTeX4; more detailed discussion, results unchanged; to be published in Nucl.Phys.A
Quasi-probability distributions in Loop Quantum Cosmology
Creators: name: Berra-Montiel, Jasel
name: Molgado, Alberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we introduce a complete family of parametrized quasi-probability distributions in phase space and their corresponding Weyl quantization maps with the aim to generalize the recently developed Wigner-Weyl formalism within the Loop Quantum Cosmology program (LQC). In particular, we intend to define those quasi-distributions for states valued on the Bohr compactification of the real line in such a way that they are labeled by a parameter that accounts for the ordering ambiguity corresponding to non-commutative quantum operators. Hence, we notice that the projections of the parametrized quasi-probability distributions result in marginal probability densities which are invariant under any ordering prescription. We also note that, in opposition to the standard Schrödinger representation, for an arbitrary character the quasi-distributions determine a positive function independently of the ordering. Further, by judiciously implementing a parametric-ordered Weyl quantization map for LQG, we are able to recover in a simple manner the relevant cases of the standard, anti-standard, and Weyl symmetric orderings, respectively. We expect that our results may serve to analyze several fundamental aspects within the LQC program, in special those related to coherence, squeezed states, and the convergence of operators, as extensively analyzed in the quantum optics and in the quantum information frameworks.
description: 12 pages, no figures