cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the Development and Use of Automated Management Aids
Creators: name: Nuthall, Peter L.
name: Nuthall, Peter L.
Publisher: name: Unknown
Year: 1979
Subjects: Research and Development/Tech Change/Emerging Technologies

description: The last twenty years have seen the development of many techniques designed to provide management information. Despite this, comparative budgeting is still the most commonly used analytical technique in applied farm management. There are moves, however, to change this situation through the development of systems designed to enable management aids to be readily available. These systems usually rely on the use of a computer. In this paper the current situation is reviewed by outlining system categories that have been developed and through discussing the important questions in the successful development and use of automated management aids designed for farmer use.
Quantum ergodicity in the many-body localization problem
Creators: name: Monteiro, Felipe
name: Tezuka, Masaki
name: Altland, Alexander
name: Huse, David A.
name: Micklitz, Tobias
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We generalize Page's result on the entanglement entropy of random pure states to the many-body eigenstates of realistic disordered many-body systems subject to long range interactions. This extension leads to two principal conclusions: first, for increasing disorder the "shells" of constant energy supporting a system's eigenstates fill only a fraction of its full Fock space and are subject to intrinsic correlations absent in synthetic high-dimensional random lattice systems. Second, in all regimes preceding the many-body localization transition individual eigenstates are thermally distributed over these shells. These results, corroborated by comparison to exact diagonalization for an SYK model, are at variance with the concept of "non-ergodic extended states" in many-body systems discussed in the recent literature.
description: 4+ pages, 2 figures, supplementary material
On the Distribution of the Adaptive LASSO Estimator
Creators: name: Pötscher, Benedikt M.
name: Schneider, Ulrike
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We study the distribution of the adaptive LASSO estimator (Zou (2006)) in finite samples as well as in the large-sample limit. The large-sample distributions are derived both for the case where the adaptive LASSO estimator is tuned to perform conservative model selection as well as for the case where the tuning results in consistent model selection. We show that the finite-sample as well as the large-sample distributions are typically highly non-normal, regardless of the choice of the tuning parameter. The uniform convergence rate is also obtained, and is shown to be slower than $n^{-1/2}$ in case the estimator is tuned to perform consistent model selection. In particular, these results question the statistical relevance of the `oracle' property of the adaptive LASSO estimator established in Zou (2006). Moreover, we also provide an impossibility result regarding the estimation of the distribution function of the adaptive LASSO estimator.The theoretical results, which are obtained for a regression model with orthogonal design, are complemented by a Monte Carlo study using non-orthogonal regressors.
description: revised version; minor changes and some material added
A Dynamic Programming Model for On-Farm Decision Making in a Drought
Creators: name: Toft, H.I.
name: O'Hanlon, P.W.
name: Toft, H.I.
name: O'Hanlon, P.W.
Publisher: name: Unknown
Year: 1979
Subjects: Farm Management

description: The model, which is based on dynamic programming, enables identification of the sequence of actions in a drought which will lead to the minimum expected cost subject to constraints. The model has been prepared as a tool which may be used to assist graziers to make decisions in a drought. The constraints consist of an upper limit on the number of a particular type of livestock which may be agisted (or droved) in a drought, an upper limit on the number sold and an upper limit on cash outlay. Actions assumed available to the grazier are sale of livestock, agistment (or droving), and supplementary feeding (or allowing mortality).
Patterns of participation, modes of exclusion : undergraduate students’ experience of community at a research-intensive university
Creators: name: Hawkey, Colleen
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to come to an understanding of the meaning and experience of community for undergraduate students at a research-intensive university. It was assumed that exploring community bounded by disciplinary affiliation would be a valuable approach to understanding this phenomenon within the context of the researchintensive university. In-depth interviews were conducted with 23 third year Psychology students pursuing either a Bachelor of Arts or a Bachelor of Science degree, and a survey designed to explore key aspects of interviewees' experiences was administered to a larger cohort of such students. Students' experiences were examined through the lens of constitutive and individualistic community frameworks, and ideal and actual experiences were compared. The results of this study show that a focus on disciplinary affiliation was a useful approach to understanding the meaning of community. Results document the significant influences of disciplinary affiliation on community membership and belonging. This exploration revealed that issues of community membership, involvement, and belonging were longitudinal processes that entailed complex patterns of participation and modes of exclusion that were influenced by students' aspirations and obligations as well as structural characteristics of the Psychology department and of the research-intensive university.
Metal-Semiconductor Transition and Fermi Velocity Renormalization in Metallic Carbon Nanotubes
Creators: name: Li, Yan
name: Rotkin, Slava V.
name: Ravaioli, Umberto
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Angular perturbations modify the band structure of armchair (and other metallic) carbon nanotubes by breaking the tube symmetry and may induce a metal-semiconductor transition when certain selection rules are satisfied. The symmetry requirements apply for both the nanotube and the perturbation potential, as studied within a nonorthogonal $π$-orbital tight-binding method. Perturbations of two categories are considered: an on-site electrostatic potential and a lattice deformation which changes the off-site hopping integrals. Armchair nanotubes are proved to be robust against the metal-semiconductor transition in second-order perturbation theory due to their high symmetry, but can develop a nonzero gap by extending the perturbation series to higher orders or by combining potentials of different types. An assumption of orthogonality between $π$ orbitals is shown to lead to an accidental electron-hole symmetry and extra selection rules that are weakly broken in the nonorthogonal theory. These results are further generalized to metallic nanotubes of arbitrary chirality.
description: Submitted to Phys. Rev. B, 23 pages, 4 figures
The Consumption Behaviour of Farmers: a review of the evidence
Creators: name: O'Mara, L. Paul
name: Mullen, John D.
name: Powell, Roy A.
name: Reece, B.F.
name: O'Mara, L. Paul
name: Mullen, John D.
name: Powell, Roy A.
name: Reece, B.F.
Publisher: name: Unknown
Year: 1988
Subjects: Consumer/Household Economics

description: Over recent years there has been marked instability in incomes earned from farming. The instability, which affects the economy generally, is transmitted partly through the consumption spending of farmers. A conventional view of the short-run marginal propensity to consume of farmers, supported by some analyses of aggregate data, is that it is zero. It is argued that this view is implausible on theoretical grounds, that the analysis giving rise to this view used aggregate data which contained serious flaws, and that evidence from micro-studies and other macro level analyses present a more realistic assessment that the short-run mpc of farmers is not zero but likely to be lower than that of non-farmers. A non-zero mpc has implications for how the farm sector interacts with the rest of the economy and is incorporated in models of the economy.
Synthesis of H-alpha absorption in old stellar systems: Formation of the cluster red sequence by "Downsizing"
Creators: name: Smith, Russell J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compute population synthesis models for the variation of H-alpha absorption indices (HaA and HaF), as a function of age and metallicity in old stellar systems. The models are based on the STELIB spectral library, and defined at resolution of 3 Angstrom FWHM. The indices are found to be highly sensitive to age variation, with only moderate response to metallicity. For galaxies uncontaminated by nebular emission, our HaA index is more powerful in breaking the age/metallicity degeneracy than H-beta or H-gamma_F. Using a sample of red cluster galaxies carefully selected to exclude objects with emission, we find a steep decline of HaA with velocity dispersion (slope -0.75 +/- 0.07 Angstrom/dex). The slope can be translated to constraints on age and metallicity scaling relations, incorporating measurement and model errors. If the HaA-sigma slope is due only to age, we obtain Age proportional to sigma^{0.95 +/- 0.12}. Because HaA depends quite weakly on [Fe/H], a metallicity interpretation would require Fe/H proportional to sigma^1.2 or steeper. The HaA-sigma slope is consistent with the combined age and metallicity scaling relations reported by Nelan et al. from classical Lick indices. The relations obtained by Thomas et al. significantly under-predict the observed slope. The discrepancy could arise from differences in the sample compositions.We discuss in detail the effects of emission contamination on the results, and conclude that these are unlikely to yield the observed behaviour in the Ha-sigma relations. The steep age--mass relation supports a "downsizing" formation scenario: fainter red-sequence galaxies became quiescent at lower redshifts, z < 0.5. This picture accords with recent observations of truncated red sequences in clusters at z ~ 0.7.
description: 11 pages, 9 figures, accepted by MNRAS
ESTIMATES OF POTENTIAL RETURNS FROM ADDED RESEARCH BUDGET FOR THE LAND GRANT UNIVERSITIES
Creators: name: Easter, K. William
name: Norton, George W.
name: Easter, K. William
name: Norton, George W.
Publisher: name: Unknown
Year: 1976
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This paper briefly reviews approaches that have been used to assess returns to U.S. agricultural research and explains the usefulness of benefit cost analysis in such evaluations. Benefit-cost analysis is applied to the Land Grant Universities federal budget requests for additional funds for corn and soybean research in the North Central region. Finally, the problems involved in applying a similar analysis to livestock and rural development research are discussed
Multimessenger pulsar timing array constraints on supermassive black hole binaries traced by periodic light curves
Creators: name: Xin, Chengcheng
name: Mingarelli, Chiara M. F.
name: Hazboun, Jeffrey S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Supermassive black hole binary systems (SMBHBs) emitting gravitational waves may be traced by periodic light curves. We assembled a catalog of 149 such periodic light curves, and using their masses, distances, and periods, predicted the gravitational-wave strain and detectability of each binary candidate using all-sky detection maps. We found that the International Pulsar Timing Array (IPTA) provides almost uniform sky coverage -- a unique ability of the IPTA -- and by 2025 will improve NANOGrav's current minimum detectable strain by a factor of 6, and its volume by a factor of 216. Moreover, IPTA will reach detection sensitivities for three candidates by 2025, and 13 by the end of the decade, enabling us to constrain the underlying empirical relations used to estimate SMBH masses. We find that we can in fact already constrain the mass of a binary in Mrk 504 to $M<3.3\times 10^9~M_\odot$. We also identify 24 high-mass high-redshift galaxies which, according to our models, should not be able to host SMBHBs. Importantly the GW detection of even one of these candidates would be an essentially eternal multimessenger system, and identifying common false positive signals from non-detections will be useful to filter the data from future large-scale surveys such as LSST.
description: 11 pages, 4 figures, accepted for publication in ApJ
Search for single top quark production in ppbar collisions at sqrt(s)=1.96 TeV
Creators: name: D0 Collaboration
name: Abazov, V
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for electroweak production of single top quarks in the s-channel and t-channel using neural networks for signal-background separation. We have analyzed 230 pb$^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV and find no evidence for a single top quark signal. The resulting 95% confidence level upper limits on the single top quark production cross sections are 6.4 pb in the s-channel and 5.0 pb in the t-channel.
description: 9 pages, 4 figures
A QUARTERLY ECONOMETRIC SIMULATION MODEL OF THE U.S. LIVESTOCK AND MEAT SECTOR
Creators: name: Buhr, Brian L.
name: Buhr, Brian L.
Publisher: name: Unknown
Year: 1993
Subjects: Livestock Production/Industries

description: This paper develops a quarterly dynamic simulation model of the U.S. livestock sector which is useful for both policy analysis and technology assessment. The model includes a complete representation of the livestock and meat supply sector, processing or margin sector and meat demand. First the conceptual framework for the model is outlined. Second, the data used for the model is presented and, finally, the estimated and validation statistics of the model are presented.
Traversable wormholes in Einstein-Dirac-Maxwell theory
Creators: name: Blázquez-Salcedo, Jose Luis
name: Knoll, Christian
name: Radu, Eugen
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a specific example of a class of traversable wormholes in Einstein-Dirac-Maxwell theory in four spacetime dimensions, without needing any form of exotic matter. Restricting to a model with two massive fermions in a singlet spinor state, we show the existence of spherically symmetric asymptotically flat configurations which are free of singularities, representing localized states. These solutions satisfy a generalized Smarr relation, being connected with the extremal Reissner-Nordström black holes. They also possess a finite mass $M$ and electric charge $Q_e$, with $Q_e/M>1$. An exact wormhole solution with ungauged, massless fermions is also reported.
description: 5 pages, 4 figures, version accepted for publication in PRL
Inertia of Intrinsic Spin
Creators: name: Mashhoon, Bahram
name: Kaiser, Helmut
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The state of a particle in space and time is characterized by its mass and spin, which therefore determine the inertial properties of the particle. The coupling of intrinsic spin with rotation is examined and the corresponding inertial effects of intrinsic spin are studied. An experiment to measure directly the spin-rotation coupling via neutron interferometry is analyzed in detail.
description: 3 pages, 1 figure, contribution to Festschrift honoring Samuel A. Werner; v2: slightly expanded version accepted for publication in Proc. Int. Conf. Neutron Scattering 2005 (scheduled for publication in the regular edition of Physica B, July 2006)
Techniques for one-loop tensor integrals in many-particle processes
Creators: name: Denner, A.
name: Dittmaier, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We briefly sketch the methods for a numerically stable evaluation of tensor one-loop integrals that have been used in the calculation of the complete electroweak one-loop corrections to $\Pep\Pem\to4 $fermions. In particular, the improvement of the new methods over the conventional Passarino--Veltman reduction is illustrated for some 4-point integrals in the delicate limits of small Gram (and other kinematical) determinants.
description: 5 pages, latex, 2 postscript figures, to appear in the proceedings of the "7th International Symposium on Radiative Corrections (RADCOR2005)", Shonan Village, 2005
Can Inflation solve the Hierarchy Problem?
Creators: name: Biswas, Tirthabir
name: Notari, Alessio
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Inflation with tunneling from a false to a true vacuum becomes viable in the presence of a scalar field that slows down the initial de Sitter phase. As a by-product this field also sets dynamically the value of the Newton constant observed today. This can be very large if the tunneling rate (which is exponentially sensitive to the barrier) is small enough. Therefore along with Inflation we also provide a natural dynamical explanation for why gravity is so weak today. Moreover we predict a spectrum of gravity waves peaked at around 0.1 mHz, that will be detectable by the planned space inteferometer LISA. Finally we discuss interesting predictions on cosmological scalar and tensor fluctuations in the light the WMAP 3-year data.
description: 7 pages. Replaced version with comparison with WMAP 3-year data
A THEORETICAL AND EMPIRICAL APPROACH TO THE VALUE OF INFORMATION IN RISKY MARKETS
Creators: name: Antonovitz, Frances
name: Roe, Terry L.
name: Antonovitz, Frances
name: Roe, Terry L.
Publisher: name: Unknown
Year: 1984
Subjects: subject: Marketing
subject: FOS: Economics and business

description: The theory of the competitive firm under price uncertainty is used to develop a money metric of a producer's willingness to pay for additional information. This concept is extended to the market by formulating ex-ante and ex-post measures of the value of a rational expectations forecast. The empirical feasibility of these measures are demonstrated by application to a simple two equation model of an agricultural market.
"... auf daß sie alle eins seien, damit die Welt glaube"
Creators: name: Stieglitz, Klaus Von
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 24 Nr. 4 (1975): Ökumenische Rundschau, Band 24, Heft 4
Spatial Planning for Urban Resilience in the Face of the Flood Risk
Creators: name: Meng, Meng
Publisher: name: A+BE | Architecture and the Built Environment
Year: 2021

description: The research was inspired by the increasing impact of extreme weather events and changing climate patterns on flood-prone regions and cities, and the consequent human and economic costs. Despite global efforts for flood resilience and climate adaptation involving climate analysts, economists, social scientists, politicians, hydrological engineers, spatial planners, and policymakers, it is only partially clear how best to construct resilience measures and implement concrete initiatives. The complexity of institutions is a key factor that is often neglected, and which needs further investigation. The thesis examines the institutional arrangements that determine the role of spatial planning in managing flood risk, through an in-depth case study of Guangzhou, one of the most vulnerable cities in China and globally. The thesis employs theories of historical institutionalism, planning procedure and planning tools, policy framing and collaborative governance, to explore the mechanisms and factors that influence the creative planning and design process. Content analysis, GIS-based mapping, stakeholder analysis and TOWS analysis are used to investigate data from official policy documents, grey literature, geo-information data and interview scripts. The findings indicate that institutional arrangements, such as long-established planning traditions, formal planning procedures and tools, policy framing patterns and contextual organisational factors, determine spatial planning’s role in managing flood risk. They do this through (1) the extent of the changeability of an established planning system towards expanded flood resilience measures; (2) the performance of cross-level communication and boundary-spanning work between planning and water management; (3) the legal framework that planners and hydrological engineers follow; and (4) the capacities of planning and water management institutions to work on flood issues. This research shows how to apply knowledge from policy science, political science, institutional science and administration, to analyse the nature of the planning process in tackling the urgent challenge of flood risk and climate change.
description: A+BE | Architecture and the Built Environment, No. 05 (2021): Spatial Planning for Urban Resilience in the Face of the Flood Risk
BioInv_Establishment_MCL_VIF_9Mar2022.R
Creators: name: MacDonald, Kelly
name: Leroux, Shawn
name: Purchase, Craig F.
Publisher: name: figshare
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Before running logistic regressions to determine the environmental variables that best explain establishment of brown trout, we test for dependence of explanatory variables and removes those that are linearly related to another.
Dealing with shame and unresolved trauma : residential school and its impact on the 2nd and 3rd generation adults
Creators: name: Ing, N. Rosalyn
Publisher: name: University of British Columbia
Year: 2009

description: 'Indian' residential schools have been a part of Canada's history since the 16th Century. This qualitative study presents the education of First Nations people from a different perspective. Using two Canadian policies of assimilation as a background, the shame and unresolved trauma associated with residential school education is examined. Ten 2nd and 3rd generation successful people whose parents endured residential schools from the 1920's to their closures in the early 1970s were purposely sampled; three are 2nd generation, and seven are 3rd generation. The most significant aspect of the research is that all ten participants have graduated from university or are currently undergraduates, and their parents also earned degrees, making them excellent role models in post-secondary education. This intergenerational aspect of residential schools is rarely acknowledged. What was shared - what finding out meant, what are the intergenerational impacts, how the participants move on, and how society moves on in view of the findings - is documented. The impacts of residential school included fifteen categories: denial of First Nations (FN) identity, belief in lies/myths about FN people, shame, poor self esteem, family silent about past, communication difficulties, expectation to be judged negatively, controlling father, experience of racism, violence and physical abuse in family, sexual abuse, alcoholism, parents who value education, and university education. These impacts were carried into the 2nd and 3rd generation with added consequences to twenty more for the 2nd and nine more impacts for the 3rd generation. This study is useful for a better understanding of this form of education.
Modeling the Marked Spectrum of Matter and Biased Tracers in Real- and Redshift-Space
Creators: name: Philcox, Oliver H. E.
name: Aviles, Alejandro
name: Massara, Elena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the one-loop perturbation theory for the power spectrum of the marked density field of matter and biased tracers in real- and redshift-space. The statistic has been shown to yield impressive constraints on cosmological parameters; to exploit this, we require an accurate and computationally inexpensive theoretical model. Comparison with $N$-body simulations demonstrates that linear theory fails on all scales, but inclusion of one-loop Effective Field Theory terms gives a substantial improvement, with $\sim 5\%$ accuracy at $z = 1$. The expansion is less convergent in redshift-space (achieving $\sim 10\%$ accuracy), but there are significant improvements for biased tracers due to the freedom in the bias coefficients. The large-scale theory contains non-negligible contributions from all perturbative orders; we suggest a reorganization of the theory that contains all terms relevant on large-scales, discussing both its explicit form at one-loop and structure at infinite-loop. This motivates a low-$k$ correction term, leading to a model that is sub-percent accurate on large scales, albeit with the inclusion of two (three) free coefficients in real- (redshift-)space. We further consider the effects of massive neutrinos, showing that beyond-EdS corrections to the perturbative kernels are negligible in practice. It remains to see whether the purported gains in cosmological parameters remain valid for biased tracers and can be captured by the theoretical model.
description: 40 pages, 11 figures, accepted by JCAP
FINPACK: THE POTENTIAL TO ADAPT IT FOR EUROPEAN UNION COUNTRIES; WITH A HISTORY OF THE DEVELOPMENT OF FINPACK WITHIN THE U.S. EXTENSION SYSTEM
Creators: name: Ferrara, Alessandro
name: Nordquist, Dale W.
name: Ciani, Adriano
name: Ferrara, Alessandro
name: Nordquist, Dale W.
name: Ciani, Adriano
Publisher: name: Unknown
Year: 1996
Subjects: Agricultural Finance

description: This work is structured in two parts. The first shows, briefly, the role of the Cooperative Extension Service in US agriculture. The second explains the main characteristics of the FINPACK software package and the potential to adapt it to European agriculture. Between these two parts is a short summary of the role of FINPACK, and, more generally, of financial management in Extension Service activities. Note: Appendix tables are not included in the machine readable file--contact the authors for copies.
CASH FLOW IMPLICATIONS OF FIXED VERSUS VARIABLE INTEREST RATE DEBT STRUCTURES
Creators: name: Moe, Lonn
name: Thompson, Jerry L.
name: Moe, Lonn
name: Thompson, Jerry L.
Publisher: name: Unknown
Year: 1984
Subjects: Agricultural Finance

description: The objective of this study was to discover the magnitude of the effect variable rate loans have on net operating cash flow over the period from 1968 to 1981. This was done by comparing a variable rate loan model with a fixed rate loan model under varying debt loads for four farm types.
Fully pseudospectral solution of the conformally invariant wave equation on a Kerr background
Creators: name: Hennig, Jörg
name: Macedo, Rodrigo Panosso
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study axisymmetric solution to the conformally invariant wave equation on a Kerr background by means of numerical and analytical methods. Our main focus is on the behaviour of the solutions near spacelike infinity, which is appropriately represented as a cylinder. Earlier studies of the wave equation on a Schwarzschild background have revealed important details about the regularity of the corresponding solutions. It was found that, on the cylinder, the solutions generically develop logarithmic singularities at infinitely many orders. Moreover, these singularities also `spread' to future null infinity. However, by imposing certain regularity conditions on the initial data, the lowest-order singularities can be removed. Here we are interested in a generalisation of these results to a rotating black hole background and study the influence of the rotation rate on the properties of the solutions. To this aim, we first construct a conformal compactification of the Kerr solution which yields a suitable representation of the cylinder at spatial infinity. Besides analytical investigations on the cylinder, we numerically solve the wave equation with a fully pseudospectral method, which allows us to obtain highly accurate numerical solutions. This is crucial for a detailed analysis of the regularity of the solutions. In the Schwarzschild case, the numerical problem could effectively be reduced to solving $(1+1)$-dimensional equations. Here we present a code that can perform the full $2+1$ evolution as required for axisymmetric waves on a Kerr background.
description: 31 pages, 14 figures
Gauss Hypergeometric Representations of the Ferrers Function of the Second Kind
Creators: name: Cohl, Howard S.
name: Park, Justin
name: Volkmer, Hans
Publisher: name: arXiv
Year: 2020
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 33C05

description: We derive all eighteen Gauss hypergeometric representations for the Ferrers function of the second kind, each with a different argument. They are obtained from the eighteen hypergeometric representations of the associated Legendre function of the second kind by using a limit representation. For the 18 hypergeometric arguments which correspond to these representations, we give geometrical descriptions of the corresponding convergence regions in the complex plane. In addition, we consider a corresponding single sum Fourier expansion for the Ferrers function of the second kind. In four of the eighteen cases, the determination of the Ferrers function of the second kind requires the evaluation of the hypergeometric function separately above and below the branch cut at $[1,\infty)$. In order to complete these derivations, we use well-known results to derive expressions for the hypergeometric function above and below its branch cut. Finally we give a detailed review of the 1888 paper by Richard Olbricht who was the first to study hypergeometric representations of Legendre functions.
Learning the ground state of a non-stoquastic quantum Hamiltonian in a rugged neural network landscape
Creators: name: Bukov, Marin
name: Schmitt, Markus
name: Dupont, Maxime
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Strongly interacting quantum systems described by non-stoquastic Hamiltonians exhibit rich low-temperature physics. Yet, their study poses a formidable challenge, even for state-of-the-art numerical techniques. Here, we investigate systematically the performance of a class of universal variational wave-functions based on artificial neural networks, by considering the frustrated spin-$1/2$ $J_1-J_2$ Heisenberg model on the square lattice. Focusing on neural network architectures without physics-informed input, we argue in favor of using an ansatz consisting of two decoupled real-valued networks, one for the amplitude and the other for the phase of the variational wavefunction. By introducing concrete mitigation strategies against inherent numerical instabilities in the stochastic reconfiguration algorithm we obtain a variational energy comparable to that reported recently with neural networks that incorporate knowledge about the physical system. Through a detailed analysis of the individual components of the algorithm, we conclude that the rugged nature of the energy landscape constitutes the major obstacle in finding a satisfactory approximation to the ground state wavefunction, and prevents learning the correct sign structure. In particular, we show that in the present setup the neural network expressivity and Monte Carlo sampling are not primary limiting factors.
Concurrency measures in the era of temporal network epidemiology: A review
Creators: name: Masuda, Naoki
name: Miller, Joel C.
name: Holme, Petter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Diseases spread over temporal networks of interaction events between individuals. Structures of these temporal networks hold the keys to understanding epidemic propagation. One early concept of the literature to aid in discussing these structures is concurrency -- quantifying individuals' tendency to form time-overlapping "partnerships". Although conflicting evaluations and an overabundance of operational definitions have marred the history of concurrency, it remains important, especially in the area of sexually transmitted infections. Today, much of theoretical epidemiology uses more direct models of contact patterns, and there is an emerging body of literature trying to connect methods to the concurrency literature. In this review, we will cover the development of the concept of concurrency and these new approaches.
description: 5 figures
Landau Levels Analog to Electric Dipole
Creators: name: Ribeiro, L. R.
name: Furtado, Claudio
name: Nascimento, J. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this letter we study the quantum dyamics of a neutral particle in the presence of an external magnetic field. We demonstrate in a specific field-dipole configuration that we have a quantization similar to the Landau Levels. We investigate this quantization motivated by the recent analysis of Landau-Aharonov-Casher(LAC) quantization of Ericsson and Sjöqvist[Phys Rev. A {\bf 65} 013607 (2001)]. The energy eigenfuction and eigenvalues are obtained.
description: 7 pages, revtex
VETERINARY MANPOWER NEEDS IN MINNESOTA, NEBRASKA, NORTH DAKOTA, SOUTH DAKOTA AND WISCONSIN
Creators: name: Aulaqi, Nasser A.
name: Sorensen, Dale K.
name: McCauley, E. Hunt
name: Aulaqi, Nasser A.
name: Sorensen, Dale K.
name: McCauley, E. Hunt
Publisher: name: Unknown
Year: 1977
Subjects: Labor and Human Capital

description: The main objective of this study was to assess the current and future demand and supply of veterinarians in the region (Minnesota, North Dakota, South Dakota, Wisconsin and Nebraska).
Sparse Gaussian Process Potentials: Application to Lithium Diffusivity in Superionic Conducting Solid Electrolytes
Creators: name: Hajibabaei, Amir
name: Myung, Chang Woo
name: Kim, Kwang S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: For machine learning of interatomic potentials a scalable sparse Gaussian process regression formalism is introduced with a data-efficient on-the-fly adaptive sampling algorithm. With this approach, the computational cost is effectively reduced to those of the Bayesian linear regression methods whilst maintaining the appealing characteristics of the exact Gaussian process regression. As a showcase, experimental melting and glass-crystallization temperatures are reproduced for Li7P3S11, Li diffusivity is simulated, and an unchartered phase is revealed with much lower Li diffusivity which should be circumvented.
description: 8 pages, 7 figures
BioInv_Establishment_Models_9Mar2022.R
Creators: name: MacDonald, Kelly
name: Leroux, Shawn
name: Purchase, Craig F.
Publisher: name: figshare
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Logistic regressions using AIC for model choice where presence/absence of brown trout = response & various abiotic, biotic, and landscape environmental variables are explanatory. The latter have been previously checked for multicolinearity. Only sites with complete abiotic, biotic and landscape data have been included in the analyses.
Simpson Filtration and Oper Stratum Conjecture
Creators: name: Hu, Zhi
name: Huang, Pengfei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: In this paper, we prove that for the oper stratification of the de Rham moduli space $M_{\mathrm{dR}}(X,r)$, the closed oper stratum is the unique minimal stratum with dimension $r^2(g-1)+g+1$, and the open dense stratum consisting of irreducible flat bundles with stable underlying vector bundles is the unique maximal stratum.
description: This paper comes from the last section of arXiv:1905.10765v1 as an independent paper. Comments are welcome! To appear in manuscripta mathematica
CHALLENGES OF AGRICULTURAL AND RURAL FINANCE IN CEE, NIS AND BALTIC COUNTRIES
Creators: name: Pederson, Glenn D.
name: Khitarishvili, Tamar
name: Pederson, Glenn D.
name: Khitarishvili, Tamar
Publisher: name: Unknown
Year: 1997
Subjects: Agricultural Finance

description: Initially, we explore the attitudes and perceptions of farmers and low farm profitability as potential constraints to rural financial intermediation and investment in agriculture. As part of this discussion we consider what is factual about the "access to credit problem." Second, we summarize recent changes in agricultural finance and credit conditions in the CEE, NIS, and Baltic countries. The focus here is on observed financing patterns, sources of credit, and the set of constraints which are thought to affect the level of rural financial intermediation. Third, we consider how banks are adapting to the new farming structures. Fourth, we review the primary modes of government intervention in financial markets and the role of government in dealing with the bad loans problem by providing "soft credits" via the banks. We conclude by suggesting the means by which governments can foster development of effective rural financial markets.
Genuine Multipartite Entanglement in Time
Creators: name: Milz, Simon
name: Spee, Cornelia
name: Xu, Zhen-Peng
name: Pollock, Felix A.
name: Modi, Kavan
name: Gühne, Otfried
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While spatial quantum correlations have been studied in great detail, much less is known about the genuine quantum correlations that can be exhibited by temporal processes. Employing the quantum comb formalism, processes in time can be mapped onto quantum states, with the crucial difference that temporal correlations have to satisfy causal ordering, while their spatial counterpart is not constrained in the same way. Here, we exploit this equivalence and use the tools of multipartite entanglement theory to provide a comprehensive picture of the structure of correlations that (causally ordered) temporal quantum processes can display. First, focusing on the case of a process that is probed at two points in time -- which can equivalently be described by a tripartite quantum state -- we provide necessary as well as sufficient conditions for the presence of bipartite entanglement in different splittings. Next, we connect these scenarios to the previously studied concepts of quantum memory, entanglement breaking superchannels, and quantum steering, thus providing both a physical interpretation for entanglement in temporal quantum processes, and a determination of the resources required for its creation. Additionally, we construct explicit examples of W-type and GHZ-type genuinely multipartite entangled two-time processes and prove that genuine multipartite entanglement in temporal processes can be an emergent phenomenon. Finally, we show that genuinely entangled processes across multiple times exist for any number of probing times.
description: 33+14 pages, 15 figures. Close to published version
BioInv_Predicted_Observed_Spread_16Mar2022.R
Creators: name: MacDonald, Kelly
name: Leroux, Shawn
name: Purchase, Craig F.
Publisher: name: figshare
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Reaction-Diffusion model used to estimate the rate of spread of the invasion front of brown trout in Newfoundland using demographic (growth) and movement (diffusion) parameters. The predictions made by the model were compared to the observed rate of spread using data collected in summer 2020.
Learning the aerodynamic design of supercritical airfoils through deep reinforcement learning
Creators: name: Li, Runze
name: Zhang, Yufei
name: Chen, Haixin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The aerodynamic design of modern civil aircraft requires a true sense of intelligence since it requires a good understanding of transonic aerodynamics and sufficient experience. Reinforcement learning is an artificial general intelligence that can learn sophisticated skills by trial-and-error, rather than simply extracting features or making predictions from data. The present paper utilizes a deep reinforcement learning algorithm to learn the policy for reducing the aerodynamic drag of supercritical airfoils. The policy is designed to take actions based on features of the wall Mach number distribution so that the learned policy can be more general. The initial policy for reinforcement learning is pretrained through imitation learning, and the result is compared with randomly generated initial policies. The policy is then trained in environments based on surrogate models, of which the mean drag reduction of 200 airfoils can be effectively improved by reinforcement learning. The policy is also tested by multiple airfoils in different flow conditions using computational fluid dynamics calculations. The results show that the policy is effective in both the training condition and other similar conditions, and the policy can be applied repeatedly to achieve greater drag reduction.
description: 32 pages, 25 figures
Takk for festskriftet Åndsmenneskets ansvar. Nordiske akademikeres festskrift til Thomas Mann på 80 årsdagen 6. juni 1955 på vegne av ektefellen og takk for krans til Manns begravelse.
Creators: name: Mann, Katia
name: Lervik, Kaare
Publisher: name: Unknown
Year: 1955

description: Med konvolutt. Se også 130030864
Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
Creators: name: Sung, Youngkyu
name: Ding, Leon
name: Braumüller, Jochen
name: Vepsäläinen, Antti
name: Kannan, Bharath
name: Kjaergaard, Morten
name: Greene, Ami
name: Samach, Gabriel O.
name: McNally, Chris
name: Kim, David
name: Melville, Alexander
name: Niedzielski, Bethany M.
name: Schwartz, Mollie E.
name: Yoder, Jonilyn L.
name: Orlando, Terry P.
name: Gustavsson, Simon
name: Oliver, William D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably control two-qubit interactions has improved operational fidelity in many-qubit systems by reducing parasitic coupling and frequency crowding issues. Nonetheless, two-qubit gate errors still limit the capability of near-term quantum applications. The reason, in part, is the existing framework for tunable couplers based on the dispersive approximation does not fully incorporate three-body multi-level dynamics, which is essential for addressing coherent leakage to the coupler and parasitic longitudinal ($ZZ$) interactions during two-qubit gates. Here, we present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. Using this approach, we experimentally demonstrate CZ and $ZZ$-free iSWAP gates with two-qubit interaction fidelities of $99.76 \pm 0.07$% and $99.87 \pm 0.23$%, respectively, which are close to their $T_1$ limits.
description: 34 pages, 39 figures
AGRICULTURAL POLICY REFORM IN THE UNITED STATES: AN UNFINISHED AGENDA
Creators: name: Stuart, Kimberly
name: Runge, C. Ford
name: Stuart, Kimberly
name: Runge, C. Ford
Publisher: name: Unknown
Year: 1996
Subjects: Agricultural and Food Policy

description: The paper is divided into three sections: a discussion of the major provisions of the FAIR act of 1996 [Federal Agriculture Improvement and Reform Act of 1996]; a review of the political forces leading up to it; and a discussion of reforms that could extend the incipient agenda that it represents.
A large deviations approach to asymptotically optimal control of crisscross network in heavy traffic
Creators: name: Budhiraja, Amarjit
name: Ghosh, Arka Prasanna
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K25, 68M20, 90B22, 90B35 (Primary) 60J70. (Secondary)

description: In this work we study the problem of asymptotically optimal control of a well-known multi-class queuing network, referred to as the ``crisscross network,'' in heavy traffic. We consider exponential inter-arrival and service times, linear holding cost and an infinite horizon discounted cost criterion. In a suitable parameter regime, this problem has been studied in detail by Martins, Shreve and Soner [SIAM J. Control Optim. 34 (1996) 2133-2171] using viscosity solution methods. In this work, using the pathwise solution of the Brownian control problem, we present an elementary and transparent treatment of the problem (with the identical parameter regime as in [SIAM J. Control Optim. 34 (1996) 2133-2171]) using large deviation ideas introduced in [Ann. Appl. Probab. 10 (2000) 75-103, Ann. Appl. Probab. 11 (2001) 608-649]. We obtain an asymptotically optimal scheduling policy which is of threshold type. The proof is of independent interest since it is one of the few results which gives the asymptotic optimality of a control policy for a network with a more than one-dimensional workload process.
description: Published at http://dx.doi.org/10.1214/105051605000000250 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)