cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DeepVA: Bridging Cognition and Computation through Semantic Interaction and Deep Learning
Creators: name: Bian, Yali
name: Wenskovitch, John
name: North, Chris
Publisher: name: arXiv
Year: 2020
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: This paper examines how deep learning (DL) representations, in contrast to traditional engineered features, can support semantic interaction (SI) in visual analytics. SI attempts to model user's cognitive reasoning via their interaction with data items, based on the data features. We hypothesize that DL representations contain meaningful high-level abstractions that can better capture users' high-level cognitive intent. To bridge the gap between cognition and computation in visual analytics, we propose DeepVA (Deep Visual Analytics), which uses high-level deep learning representations for semantic interaction instead of low-level hand-crafted data features. To evaluate DeepVA and compare to SI models with lower-level features, we design and implement a system that extends a traditional SI pipeline with features at three different levels of abstraction. To test the relationship between task abstraction and feature abstraction in SI, we perform visual concept learning tasks at three different task abstraction levels, using semantic interaction with three different feature abstraction levels. DeepVA effectively hastened interactive convergence between cognitive understanding and computational modeling of the data, especially in high abstraction tasks.
Spin-polarized scanning tunneling microscopy of half-metallic ferromagnets: Non-quasiparticle contributions
Creators: name: Irkhin, V. Yu.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The role of the many-body (spin-polaronic) effects in the scanning tunneling spectroscopy of half-metallic ferromagnets (HMF) is considered. It is shown that the non-quasiparticle (NQP) states exist in the majority or minority spin gap in the presence of arbitrary external potential and, in particular, at the surfaces and interfaces. Energy dependence of the NQP density of states is obtained in various models of HMF, an important role of the hybridization nature of the energy gap being demonstrated. The corresponding temperature dependence of spin polarization is calculated. It is shown that the NQP states result in a sharp bias dependence of the tunneling conductance near zero bias. Asymmetry of the NQP states with respect to the Fermi energy provides an opportunity to separate phonon and magnon peaks in the inelastic spectroscopy by STM.
description: 13 pages, 6 figures
Visibility for self-similar sets of dimension one in the plane
Creators: name: Simon, Károly
name: Solomyak, Boris
Publisher: name: arXiv
Year: 2005
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 28A80

description: We prove that a purely unrectifiable self-similar set of finite 1-dimensional Hausdorff measure in the plane, satisfying the Open Set Condition, has radial projection of zero length from every point.
description: 12 pages, 2 figures
Self-organized Boolean game on networks
Creators: name: Zhou, Tao
name: Wang, Bing-Hong
name: Zhou, Pei-Ling
name: Yang, Chun-Xia
name: Liu, Jun
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: A model of Boolean game with only one free parameter $p$ that denotes the strength of herd behavior is proposed where each agent acts according to the information obtained from his neighbors in network and those in the minority are rewarded. The simulation results indicate that the dynamic of system is sensitive to network topology, where the network of larger degree variance, i.e. the system of greater information heterogeneity, leads to less system profit. The system can self-organize to a stable state and perform better than random choice game, although only the local information is available to the agents. In addition, in heterogeneity networks, the agents with more information gain more than those with less information for a wide extent of herd strength $p$.
description: 5 pages, 5 eps figures
Towards a discovery of BSM physics from the Cabibbo angle anomaly
Creators: name: Seng, Chien-Yeah
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: New developments in both the theories and experiments related to the extraction of the top-row Cabibbo-Kobayashi-Maskawa matrix elements $V_{ud}$ and $V_{us}$ led to a series of new anomalies, for instance the apparent violation of the top-row unitarity relation. It is important to further reduce all the associated Standard Model theory uncertainties in order to better understand whether such observations point towards the possibility of physics beyond the Standard Model, or rather some unexpectedly large Standard Model effects. This requires improved studies of tree-level and higher-order Standard Model corrections that enter the beta decays of pions, neutron, nuclei and kaons. We will briefly review the recent progress along this direction and discuss possible improvements in the future.
description: Version accepted by MPLA
Algebraic decomposition of the electromagnetic constitutive tensor. A step toward pre-metric based gravitation?
Creators: name: Matagne, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is known that the electromagnetic constitutive tensor can be algebraically decomposed in three parts: the so-called principal part, the axion part and the skewon part (see gr-qc/0506042). The aim of this paper is to provide a deeper decomposition of the principal part.
description: 12 pages, PDF only
Quintessential inflation and nonlinear effects of the tachyonic trap mechanism
Creators: name: Karčiauskas, Mindaugas
name: Rusak, Stanislav
name: Saez, Alejandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: With the help of the tachyonic trapping mechanism one can potentially solve a number of problems affecting quintessential inflation models. In this mechanism we introduce a trapping field with a spontaneous symmetry breaking potential. When the quintessential inflaton passes the critical point, a sudden burst of particle production is able to reheat the Universe and trap the inflaton away from theminimum of its potential. However, self-interactions of the trapping field suppress particle production and reduce the efficiency of this process. We develop a method to compute the magnitude of the suppression and explore the parameter space in which the mechanism can be applied effectively.
description: 15 pages, 2 figures
ВНУТРИМАТОЧНЫЕ СПАЙКИ: ФАКТОРЫ РИСКА И ПРОФИЛАКТИКА ЗАБОЛЕВАНИЯ У ЖЕНЩИН РЕПРОДУКТИВНОГО ВОЗРАСТА С НАЛИЧИЕМ БЕСПЛОДИЯ.
Creators: name: Мамирова, Г.Э.
Publisher: name: Zenodo
Year: 2024

description: Внутриматочные синехии или спайки (ВМС) под общеизвестным названием Синдрома Ашермана (СА), не смотря на своё широкоизучанность остаётся одним из важных вопросов в оперативной гинекологии. На развития данного заболевания приводят травмы базального слоя эндометрия, которые являются последствиями внутриматочных вмешательств таких, как выскабливание полости матки после родов или неполных абортов, полипэктомия, миомэктомия, кесарево сечение и др. В результате образования спаек полость матки деформируется и как последствие развивается функциональное нарушение. Также бессимптомное течение этой патологии усложняет своевременную диагностику и лечению, в связи чем требует достаточного изучения причин развития внутриматочных спаек. Одновременно нужно помнить о ранней профилактике заболевания для снижения частоты осложнений таких, как бесплодие, невынашивание беременности и др.
Model of the dynamics of an interface between a smectic phase and an isotropic phase of different density
Creators: name: Vitral, Eduardo
name: Leo, Perry H.
name: Viñals, Jorge
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Soft modulated phases have been shown to undergo complex morphological transitions, in which layer remodeling induced by mean and Gaussian curvatures plays a major role. This is the case in smectic films under thermal treatment, where focal conics can be reshaped into conical pyramids and concentric ring structures. We build on earlier research on a smectic-isotropic, two phase configuration in which diffusive evolution of the interface was driven by curvature, while mass transport was neglected. Here, we explicitly consider evaporation-condensation processes in a smectic phase with mass transport through a coexisting isotropic fluid phase, as well as the hydrodynamic stresses at the interface and the resulting flows. By employing the Coleman-Noll procedure, we derive a phase-field model that accounts for a varying density field coupled to smectic layering of the order parameter. The resulting equations govern the evolution of an interface between a modulated phase and an isotropic fluid phase with distinct densities, and they capture compressibility effects in the interfacial region and topological transitions. We first verify a numerical implementation of the governing equations by examining the dispersion relation for interfacial transverse modes. The inverse decay rate is shown to scale as $Q^{2}$ ($Q$ is the wavenumber of the perturbation) due to hydrodynamic effects, instead of the $Q^{4}$ expected for diffusive decay. Then, by integrating the equations forward in time, we investigate fluid flow on distorted layers and focal conics, and show how interfacial stresses and density contrast significantly determine the structure of the flow and the evolution of the configuration.
Almost Existence From the Feral Perspective and Some Questions
Creators: name: Fish, Joel W.
name: Hofer, Helmut
Publisher: name: arXiv
Year: 2020
Subjects: subject: Symplectic Geometry (math.SG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper is concerned with the "almost existence" phenomenon for periodic orbits of Hamiltonian dynamical systems. In particular, we recover this result in both some standard and some novel cases via feral curves and an adiabatic degeneration.
description: 41 pages
New physics in $s\to d$ semileptonic transitions: rare hyperon vs. kaon decays
Creators: name: Geng, Li-Sheng
name: Camalich, Jorge Martin
name: Shi, Rui-Xiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We investigate the potential of rare hyperon decays to probe the short distance structure in the $s\to dν\barν$ and $s\to d\ell^+\ell^-$ transitions. Hyperon decays into neutrinos ($B_1\to B_2ν\barν$) can be reliably predicted by using form factors determined in baryon chiral perturbation theory. Their decay rates are sensitive to different short-distance operators, as compared to their kaon counterparts, and the corresponding branching fractions are in the range of $10^{-14}\sim10^{-13}$ in the standard model. In the context of the low-energy effective theory, we find that the anticipated BESIII measurements of the $B_1\to B_2ν\barν$ decays would lead to constraints on new physics in the purely axial vector $\bar d γ_μγ_5 s$ current that are stronger than the present limits from their kaon siblings $K\to ππν\barν$. On the other hand, although hyperon decays into charged leptons are dominated by long-distance hadronic contributions, angular observable such as the leptonic forward-backward asymmetry is sensitive to the interference between long- and short-distance contributions. We discuss the sensitivity to new physics of a potential measurement of this observable in comparison with observables in the kaon decays $K_L\toμ^+μ^-$ and $K^+\toπ^+μ^+μ^-$. We conclude that the current kaon bounds are a few orders of magnitude better than those that could be obtained from $Σ^+\to pμ^+μ^-$ except for two scenarios with new physics in the $(\bar d γ^μs)(\bar\ellγ_μγ_5\ell)$ and $(\bar d γ^μγ_5s)(\bar\ellγ_μ\ell)$ currents. Finally, we point out that the loop effects from renormalization group evolution are important in this context, when relating the low-energy effective field theory to new physics models in the UV.
description: 27 pages, 1 figure, 5 tables. Matches published version
The influence of time-periodic dissipation on energy and dispersive estimates
Creators: name: Wirth, Jens
Publisher: name: arXiv
Year: 2005
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 35L05, 35L15

description: In this short note we discuss the influence of a time-periodic dissipation term on a-priori estimates for solutions to dissipative wave equations. The approach is based on a diagonalisation argument for high frequencies and results from spectral theory of periodic differential equations / Floquet theory for bounded frequencies.
description: 9 pages
Cameron-Liebler line classes
Creators: name: Rodgers, Morgan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 51A50, 51E20

description: New examples of Cameron-Liebler line classes in $\mathrm{PG}(3,q)$ are given with parameter $\frac{1}{2}(q^2 -1)$. These examples have been constructed for many odd values of $q$ using a computer search, by forming a union of line orbits from a cyclic collineation group acting on the space. While there are many equivalent characterizations of these objects, perhaps the most significant is that a set of lines $\mathcal{L}$ in $\mathrm{PG}(3,q)$ is a Cameron-Liebler line class with parameter $x$ if and only if every spread $\mathcal{S}$ of the space shares precisely $x$ lines with $\mathcal{L}$. These objects are related to generalizations of symmetric tactical decompositions of $\mathrm{PG}(3,q)$, as well as to subgroups of $\mathrm{PΓL}(4,q)$ having equally many orbits on points and lines of $\mathrm{PG}(3,q)$. Furthermore, in some cases the line classes we construct are related to two-intersection sets in $\mathrm{AG}(2,q)$. Since there are very few known examples of these sets for $q$ odd, any new results in this direction are of particular interest.
Vööbus, Arthur: Discoveries of very important manuscript sources for the Syro-Hexapla
Creators: name: Cramer, Winfrid
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 60 (1976): Oriens christianus, Band 60
Constraints on the distribution of absorption in the X-ray selected AGN population found in the 13H XMM-Newton/Chandra deep field
Creators: name: Dwelly, T.
name: Page, M. J.
name: Loaring, N. S.
name: Mason, K. O.
name: McHardy, I.
name: Gunn, K.
name: Sasseen, T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an analysis of the X-ray properties of sources detected in the 13H XMM-Newton deep (200ks) field. In order to constrain the absorbed AGN population, we use extensive Monte Carlo simulations to directly compare the X-ray colours of observed sources with those predicted by several model distributions. We have tested the simplest form of the AGN unified scheme, whereby the intrinsic XLF of absorbed AGN is set to be the same as that of their unabsorbed brethren, coupled with various model distributions of absorption. The best fitting of these models sets the fraction of AGN with absorbing column NH, proportional to (logNH)^8. We have also tested two extensions to the unified scheme: an evolving absorption scenario, and a luminosity dependent model distribution. Both of these provide poorer matches to the observed X-ray colour distributions than the best fitting simple unified model. We find that a luminosity dependent density evolution XLF reproduces poorly the 0.5-2 keV source counts seen in the 13H field. Field to field variations could be the cause of this disparity. Computing the simulated X-ray colours with a simple absorbed power-law + reflection spectral model is found to over-predict, by a factor of two, the fraction of hard sources that are completely absorbed below 0.5 keV, implying that an additional source of soft-band flux must be present for a number of the absorbed sources. Finally, we show that around 40% of the 13H sample are expected to be AGN with NH>10^22 cm^-2.
description: 13 pages, 9 figures, Accepted for publication in MNRAS
Seating preference analysis for hybrid workplaces
Creators: name: Rahaman, Mohammad Saiedur
name: Kudo, Shaw
name: Rawling, Tim
name: Ren, Yongli
name: Salim, Flora D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Due to the increasing nature of flexible work and the recent requirements from COVID-19 restrictions, workplaces are becoming more hybrid (i.e. allowing workers to work between traditional office spaces and elsewhere including from home). Since workplaces are different in design, layout and available facilities, many workers find it difficult to adjust accordingly. Eventually, this impacts negatively towards work productivity and other related parameters including concentration, stress, and mood while at work. One of the key factors that causes this negative work experience is directly linked to the available seating arrangements. In this paper, we conduct an analysis to understand various seating preferences of 37 workers with varying demographics, using the data collected pre-COVID-19, and analyse the findings in the context of hybrid workplace settings. We also discuss a list of implications illustrating how our findings can be adapted across wider hybrid work settings.
description: 4 pages, 3 figures
title: All hands on deck: successfully navigating a Voyager upgrade (a small library point of view)
Creators: name: Guy, Laura
Publisher: name: Mountain Scholar
Year: 2007
Subjects: subject: Voyager
subject: upgrade
subject: Integrated library systems (Computer systems)
subject: Libraries

description: 49 Powerpoint slides.
description: Presentation delivered at the April 2004 meeting of the Endeavor User Group in Chicago, Illinois.
An Unbiased Survey for Molecular Clouds in the Southern Galactic Warp
Creators: name: Nakagawa, Masanori
name: Onishi, T.
name: Mizuno, A.
name: Fukui, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have made an unbiased survey for molecular clouds in the Galactic Warp. This survey, covering an area of 56 square degrees at l = 252 deg to 266 deg and b = -5 deg to -1 deg, has revealed 70 molecular clouds, while only 6 clouds were previously known in the region. The number of molecular clouds is, then, an order of magnitude greater than previously known in this sector at R > 14.5 kpc. The mass of the clouds is in a range from 7.8x10(2) Mo to 8.4x10(4) Mo, significantly less than the most massive giant molecular clouds in the inner disk, ~10(6) Mo, while the cloud mass spectrum characterized by a power law is basically similar to other parts of the Galaxy. The X factor, N(H2)/Wco(12CO), derived from the molecular clouds in the Warp is estimated to be 3.5(+/-1.8) times larger than that in the inner disk. The total molecular mass in the Warp is estimated as 7.3x10(5) Mo, and total mass in the far-outer Galaxy (R > 14.5 kpc) can be estimated as 2x10(7) Mo. The spatial correlation between the CO and HI distribution appears fairly good, and the mass of the molecular gas is about 1% of that of the atomic gas in the far-outer Galaxy. This ratio is similar to that in the interarm but is ten times smaller than those of the spiral arms. Only 6 of the 70 Warp clouds show signs of star formation at the IRAS sensitivity and star formation efficiency for high-mass stars in the Warp is found to be smaller than those in other molecular clouds in the Galaxy.
description: 29 pages, including 12 (pages of) figures, accepted for PASJ, and will be published in PASJ Vol.57, No.6. Tables and color-figures are available on-line: http://www.a.phys.nagoya-u.ac.jp/~masa/study/nakagawa_etal2005_warp.pdf
Multi-periodic variations in the last 104 years light curve of the symbiotic star BF Cyg
Creators: name: Leibowitz, Elia
name: Formiggini, Liliana
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyse a light curve of the symbiotic star BF Cyg, covering 114 years of its photometric history. The star had a major outburst around the year 1894. Since then the mean optical brightness of the system is in steady decline, reaching only in the last few years its pre-outburst value. Superposed on this general decline are some 6 less intense outbursts of 1-2 magnitude and duration of 2000-5000 days. We find a cycle of ~6376 days, or possibly twice this period, in the occurrence of these outbursts. We suggest that the origin of the system outbursts is in some magnetic cycle in the outer layers of the giant star of the system, akin to the less intense ~8000 days magnetic cycle of our Sun. We further find, that in addition to its well known binary period of 757.3 days, BF Cyg possesses also another photometric period of 798.8 days. This could be the rotation period of the giant star of the system. If it is, the beat period of these two periodicities, 14580 days, is the rotation period of a tidal wave on the surface of the giant. A 4th period of 4436 days, the beat period of the 14580 and the 6376 cycles is possibly also present in the LC. We predict that BF Cyg will be at the peak of its next outburst around the month of May in the year 2007. The newly discovered 798.8 days period explains the disappearance of the orbital modulation at some epochs in the light curve. The 757.3 oscillations will be damped again around the year 2013.
description: 9 pages 7 figures. Accepted by MNRAS
Rigidity and stability of cold dark solid universe model
Creators: name: Battye, R. A.
name: Carter, B.
name: Chachoua, E.
name: Moss, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Observational evidence suggests that the large scale dynamics of the universe is presently dominated by dark energy, meaning a non-luminous cosmological constituent with a negative value of the pressure to density ratio $w=P/ρ$, which would be unstable if purely fluid, but could be stable if effectively solid with sufficient rigidity. It was suggested by Bucher and Spergel that such a solid constituent might be constituted by an effectively cold (meaning approximately static) distribution of cosmic strings with $w=-1/3$, or membranes with the observationally more favoured value $w=-2/3$, but it was not established whether the rigidity in such models actually would be sufficient for stabilisation. The present article provides an explicit evaluation of the rigidity to density ratio, which is shown to be given in both string and membrane cases by $μ/ρ=4/15$, and it is confirmed that this is indeed sufficient for stabilisation.
description: 6 pages latex, revised version extended to include 4 figures
From Semantics to Types: the Case of the Imperative lambda-Calculus
Creators: name: de'Liguoro, Ugo
name: Treglia, Riccardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.3.2; F.4.1

description: We propose an intersection type system for an imperative lambda-calculus based on a state monad and equipped with algebraic operations to read and write to the store. The system is derived by solving a suitable domain equation in the category of omega-algebraic lattices; the solution consists of a filter-model generalizing the well-known construction for ordinary lambda-calculus. Then the type system is obtained out of the term interpretations into the filter-model itself. The so obtained type system satisfies the "type-semantics" property, and it is sound and complete by construction.
description: In Proceedings MFPS 2021, arXiv:2112.13746. arXiv admin note: substantial text overlap with arXiv:2104.01358
Hydrodynamical simulations of the decay of high-speed molecular turbulence. II. Divergence from isothermality
Creators: name: Pavlovski, G.
name: Smith, M. D.
name: Mac Low, M. -M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A roughly constant temperature over a wide range of densities is maintained in molecular clouds through radiative heating and cooling. An isothermal equation of state is therefore frequently employed in molecular cloud simulations. However, the dynamical processes in molecular clouds include shock waves, expansion waves, cooling induced collapse and baroclinic vorticity, all incompatible with the assumption of a purely isothermal flow. Here, we incorporate an energy equation including all the important heating and cooling rates and a simple chemical network into simulations of three-dimensional, hydrodynamic, decaying turbulence. This allows us to test the accuracy of the isothermal assumption by directly comparing a model run with the modified energy equation to an isothermal model. We compute an extreme case in which the initial turbulence is sufficiently strong to dissociate much of the gas and alter the specific heat ratio. The molecules then reform as the turbulence weakens. We track the true specific heat ratio as well as its effective value. We analyse power spectra, vorticity and shock structures, and discuss scaling laws for decaying turbulence. We derive some limitations to the isothermal approximation for simulations of the interstellar medium using simple projection techniques. Overall, even given the extreme conditions, we find that an isothermal flow provides an adequate physical and observational description of many properties. The main exceptions revealed here concern behaviour directly related to the high temperature zones behind the shock waves.
description: accepted for publication by MNRAS
CAN HYSTERESIS AND REAL OPTIONS EXPLAIN THE FARMLAND VALUATION PUZZLE?
Creators: name: Turvey, Calum G.
name: Turvey, Calum G.
Publisher: name: Unknown
Year: 2002
Subjects: Land Economics/Use

description: This paper proposes that the common finding that land prices are systematically higher than their fundamental value as measured by the present value of future cash might be due to real options arising from uncertainty in cash flows. The paper posits a model in which the seller has a real option to postpone the sale of land. Because the value of land is measured as a present value, the buyer does not hold a similar option to postpone the purchase. It is argued that the seller's option offers a plausible explanation for the wedge between observed farmland prices and the present value model. The paper uses a Dixit and Pindyck (1996) real options framework. Using historical cash flow and land price information for Ontario, it is shown how real options can lead to a land price greater than that predicted by the present value model. The findings also suggest the existence of land price bubbles and shows how a real options framework can be used to detect bubbles.
Gaia and Hubble unveil the kinematics of stellar populations in the Type II globular clusters ω Centauri and M 22
Creators: name: Cordoni, G.
name: Milone, A. P.
name: Marino, A. F.
name: Da Costa, G. S.
name: Dondoglio, E.
name: Jerjen, H.
name: Lagioia, E. P.
name: Mastrobuono-Battisti, A.
name: Norris, J. E.
name: Tailo, M.
name: Yong, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The origin of multiple stellar populations in Globular Clusters (GCs) is one of the greatest mysteries of modern stellar astrophysics. N-body simulations suggest that the present-day dynamics of GC stars can constrain the events that occurred at high redshift and led to the formation of multiple populations. Here, we combine multi-band photometry from the Hubble Space Telescope (HST) and ground-based facilities with HST and Gaia Data Release 2 proper motions to investigate the spatial distributions and the motions in the plane of the sky of multiple populations in the type II GCs NGC 5139 ($ω\,$Centauri) and NGC 6656 (M 22). We first analyzed stellar populations with different metallicities. Fe-poor and Fe-rich stars in M 22 share similar spatial distributions and rotation patterns and exhibit similar isotropic motions. Similarly, the two main populations with different iron abundance in $ω\,$Centauri share similar ellipticities and rotation patterns. When analyzing different radial regions, we find that the rotation amplitude decreases from the center towards the external regions. Fe-poor and Fe-rich stars of $ω\,$Centauri are radially anisotropic in the central region and show similar degrees of anisotropy. We also investigate the stellar populations with different light-element abundances and find that their N-rich stars exhibit higher ellipticity than N-poor stars. In $ω\,$Centauri Centauri both stellar groups are radially anisotropic. Interestingly, N-rich, Fe-rich stars exhibit different rotation patterns than N-poor stars with similar metallicities. The stellar populations with different nitrogen of M 22 exhibit similar rotation patterns and isotropic motions. We discuss these findings in the context of the formation of multiple populations.
description: 24 pages, 13 figures, accepted for publication in ApJ
Infant feeding practices and breastfeeding strategies at the advent of the Neolithic in the Central Balkans
Creators: name: Jovanović, Jelena
name: Gwenaëlle, Goude
name: Novak, Mario
name: Bedić, Željka
name: de Becdelievre, Camille
name: Stefanović, Sofija
Publisher: name: Zenodo
Year: 2018
Subjects: Neolithic
breastfeeding
isotopes

description: Examining individual life-histories provide a direct way to understand the mechanisms of population's adaptation to major ecological and socio-cultural changes. The Mesolithic- Neolithic transformations offer a convenient frame to develop this bottom-up approach. The Neolithic transition, the passage from mobile foraging to sedentary farming, was a major shift during human prehistory. Focusing on the Balkan region where Early Neolithic started around 6200 cal BC, this paper presents stable isotope results (carbon, nitrogen, sulfur) of an intra-individual sampling strategy (data on bone and deciduous/permanent teeth) performed on 30 children from Mesolithic and Neolithic sites situated across Serbia and Croatia. Results suggest significant differences in the feeding practices of Mesolithic and Neolithic children as well as regional differences in mother's dietary choices. This study opens new horizons on the relationship between individuals subsistence strategies and the dynamic of the group, implying that these bio-cultural differences may contribute to the important demographic changes observed at the Mesolithic-Neolithic transition.
Correct path-integral formulation of quantum thermal field theory in coherent-state representation
Creators: name: Su, Jun-Chen
name: Zheng, Fu-Hou
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The path-integral quantization of thermal scalar, vector and spinor fields is performed newly in the coherent-state representation. In doing this, we choose the thermal electrodynamics and $ϕ^4$ theory as examples. By this quantization, correct expressions of the partition functions and the generating functionals for the quantum thermal electrodynamics and $ϕ^4$ theory are obtained in the coherent-state representation. These expressions allow us to perform analytical calculations of the partition functions and generating functionals and therefore are useful in practical applications. Especially, the perturbative expansions of the generating functionals are derived specifically by virtue of the stationary-phase method. The generating functionals formulated in the position space are re-derived from the ones given in the coherent-state representation.
HETEROGENEOUS PREFERENCES FOR CONGESTION DURING A WILDERNESS EXPERIENCE
Creators: name: Boxall, Peter C.
name: Rollins, Kimberly S.
name: Englin, Jeffrey E.
name: Boxall, Peter C.
name: Rollins, Kimberly S.
name: Englin, Jeffrey E.
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: This analysis breaks down the congestion levels experienced during specific parts of a wilderness canoe trip. By explicitly addressing the heterogeneity in preferences for congestion during a trip, we were able to determine the relative value canoeists place on solitude at different points of a trip. Our econometric model utilizes a random effects probit framework to efficiently estimate the welfare impacts of congestion on each trip portion. The welfare effects of congestion levels vary across wilderness areas, parts of a trip and individuals.
Improving key rates of the unbalanced phase-encoded BB84 protocol using the flag-state squashing model
Creators: name: Li, Nicky Kai Hong
name: Lütkenhaus, Norbert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: All phase-encoded BB84 implementations have signal states with unbalanced amplitudes in practice. Thus, the original security analyses a priori do not apply to them. Previous security proofs use signal tagging of multi-photon pulses to recover the behaviour of regular BB84. This is overly conservative, as for unbalanced signals, the photon-number splitting attack does not leak full information to Eve. In this work, we exploit the flag-state squashing model to preserve some parts of the multi-photon generated private information in our analysis. Using a numerical proof technique, we obtain significantly higher key rates compared with previously published results in the low-loss regime. It turns out that the usual scenario of untrusted dark counts runs into conceptual difficulties in some parameter regime. Thus, we discuss the trusted dark count scenario in this paper as well. We also report a gain in key rates when part of the total loss is known to be induced by a trusted device. We highlight that all these key rate improvements can be achieved without modification of the experimental setup.
description: 17 pages, 6 figures
OPTIMAL COLLECTIVE INVESTMENT IN GENERIC ADVERTISING, EXPORT MARKET PROMOTION AND COST-OF-PRODUCTION REDUCING RESEARCH
Creators: name: Cranfield, John A.L.
name: Cranfield, John A.L.
Publisher: name: Unknown
Year: 2002
Subjects: subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Optimal investment rules are developed for a producer agency investing in domestic market generic advertising, export market promotion, and cost of production reducing research. Analytical results show fundamental difference in optimal investment rules when the producer group is assumed to maximise either producers' surplus or social surplus. Incorporating a constraint limiting total expenditure on the three activities substantially alters the structure of the optimal investment rules. Results highlight the importance of accounting for the financing mechanism when modelling optimal producer investment. Simulation of the optimal intensities suggests the proposed budget of the Canadian Beef Cattle Research Market Development and Promotion Agency under-estimates the optimal level of investment.
1998 EASTERN ONTARIO ICE STORM MAPLE PRODUCERS' SURVEY: SUMMARY AND RESULTS
Creators: name: Kidon, Jennifer
name: Fox, Glenn
name: McKenney, Daniel W.
name: Chapeskie, D.
name: Kidon, Jennifer
name: Fox, Glenn
name: McKenney, Daniel W.
name: Chapeskie, D.
Publisher: name: Unknown
Year: 2000
Subjects: Crop Production/Industries
Resource /Energy Economics and Policy

description: In August, 1999, a telephone survey of maple producers in eastern Ontario was conducted in order to gather information on the changes in their operations since the 1998 ice storm. This paper presents the findings of the survey. The results will be used in a larger study to examine the economic impact of the ice storm on maple producers in this region.
DEMAND SYSTEM CHOICE BASED ON TESTING THE ENGEL CURVE SPECIFICATION
Creators: name: Soregaroli, Claudio
name: Huff, Karen
name: Meilke, Karl D.
name: Soregaroli, Claudio
name: Huff, Karen
name: Meilke, Karl D.
Publisher: name: Unknown
Year: 2002
Subjects: Demand and Price Analysis

description: It is common to use a demand systems approach in estimating the key parameters from household consumption data. In conducting these studies the researcher is faced with selecting a functional form. In turn, each functional form implies a particular shape for the Engel curves. This analysis highlights the importance of testing the shape of Engel curves, especially if the researcher is interested in elasticity estimates well away from the sample mean. Using consumption data for selected households in Italy it is shown that many popular functional forms are rejected by the data.
PRIVATE RESOURCE MANAGEMENT AND PUBLIC TRUST: OPTIMAL RESOURCE CONSERVATION CONTRACTS UNDER ASYMMETRIC INFORMATION
Creators: name: Huennemeyer, Anne-Juliane
name: Rollins, Kimberly S.
name: Huennemeyer, Anne-Juliane
name: Rollins, Kimberly S.
Publisher: name: Unknown
Year: 2001
Subjects: Resource /Energy Economics and Policy

description: We analyse efficiency problems of incentive-compatible contracts under moral hazard and/or adverse selection in the context of private resource management. The paper contributes to defining the regulatory role in creating an optimal information environment between regulator and private resource managers to maximize welfare from a mixed public-private good. The optimal contract structures developed in a principal-agent framework induce self-selection and type-specific conservation efforts. The associated contracting inefficiencies, however, are increasing in the degree of information asymmetry across scenarios, the total costs of conservation, and the difference in conservation costs across types. The results of this study imply that conservation contracts to mitigate problems of moral hazard and adverse selection are welfare improving if efficiency gains from private management outweigh the inefficiencies associated with incentive compatible contract design. Alternatively, the regulator can choose to retain information on 'types' and 'effort' during institutional transformations.
D-branes in the diagonal SU(2) coset
Creators: name: Wurtz, Albrecht
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The symmetry preserving D-branes in coset theories have previously been described as being centered around projections of products of conjugacy classes in the underlying Lie groups. Here, we investigate the coset where a diagonal action of SU(2) is divided out from SU(2)\times SU(2). The corresponding target space is described as a (3-dimensional) pillow with four distinguished corners. It is shown that the (fractional) brane which corresponds to the fixed point that arises in the CFT description, is spacefilling. Moreover, the spacefilling brane is the only one that reaches all of the corners. The other branes are 3, 1 and 0 - dimensional.
description: v2: reference added, 9 pages
SHORT-TERM EMPLOYMENT TRANSITIONS OF THE CANADIAN LABOUR FORCE: RURAL-URBAN DIFFERENCES
Creators: name: Vera-Toscano, Esperanza
name: Phimister, Euan
name: Weersink, Alfons
name: Vera-Toscano, Esperanza
name: Phimister, Euan
name: Weersink, Alfons
Publisher: name: Unknown
Year: 2002
Subjects: Community/Rural/Urban Development
Labor and Human Capital

description: Using data from the Canadian Survey of Labour and Income Dynamics (SLID) for the period 1993-1996, we examine patterns and determinants of labour force transitions of adequately employed and underemployed workers in an attempt to explore whether employment dynamics significantly differ between rural and urban workers so as to disadvantage rural economic performance. The results indicate that rural underemployed workers in Canada are, in the short run (year-to-year transitions) equally likely to enter adequate employment as adequately employed individuals are to enter underemployment. Further, we also found there is weak evidence that education level of rural workers has a lower impact on the probability of moving out of underemployment than in urban areas. In addition rural women are significantly less likely than their male cunterparts and urban workers to enter adeequate employment although the presence of young children does not seem to especially constrain rural women's employment. The results suggest that labour force transition in and out of adequate employment, and particularly underemployment, significantly differ between rural and urban workers and should be taken into account when evaluating employment hardship in rural Canada.
High Precision Calculations of the Higgs Boson Mass
Creators: name: R., E. A. Reyes
name: Fazio, A. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we are going to review the status of the computations of the perturbative quantum corrections to the Higgs boson mass in the Standard Model and in its supersymmetric extensions. In particular, supersymmetric theories require a very accurate computation of the Higgs boson mass, which includes corrections up to even three-loop level, since their predictions are limited by theoretical uncertainties. A discussion about these uncertainties in the context of the minimal and next to minimal supersymmetric standard models is included.
description: 26 pages; 8 figures
A Modified, Implicit, Directly Additive Demand System
Creators: name: Cranfield, John A.L.
name: Preckel, Paul V.
name: Hertel, Thomas W.
name: Cranfield, John A.L.
name: Preckel, Paul V.
name: Hertel, Thomas W.
Publisher: name: Unknown
Year: 2005
Subjects: Demand and Price Analysis

description: A recently developed demand system, nicknamed AIDADS, offers a more general approach to capturing consumption preferences. AIDADS generalizes the LES by assuming marginal budget shares vary indirectly with expenditure. AIDADS is limited by the fact that the subsistence parameters are constant across expenditure. We modify AIDADS by replacing the constant subsistence parameters with a function which varies with utility, and hence expenditure. The modified AIDADS (MAIDADS) allows subsistence levels to vary with expenditure. This model is applied to the 1996 International Consumption Project data. As these data span a wide range of expenditure levels, MAIDADS offers a viable alternative when estimating "global demand systems." Results suggest subsistence values for livestock and other food products vary with expenditure, while those for grain are constant across expenditure.
Experiencias de Enseñanza en Algoritmos y Estructuras de Datos en la FIUNER
Creators: name: Nicolet, Jonathan José Carlos
name: Vertiz del Valle, Diana Carolina
name: Ferster, María Belén
name: Breggia, Bruno Maximiliano
name: Insfrán, Jordán Francisco
name: Diaz Zamboni, Javier Eduardo
Publisher: name: Zenodo
Year: 2023
Subjects: metodología de enseñanza
algoritmos y estructuras de datos
lenguajes de programación
pruebas unitarias
sistema de versionado

description: Somos el equipo docente de la asignatura Algoritmos y Estructuras de Datos de la Facultad de Ingeniería de la Universidad Nacional de Entre Ríos (FI-UNER). Nos hemos propuesto la misión de implementar mejoras significativas en la enseñanza de esta materia básica de Ciencias de la Computación. En esta presentación abordaremos las experiencias obtenidas a raíz de los cambios que implementamos en la asignatura, en base al contexto curricular, los contenidos mínimos y el perfil de los y las estudiantes.

Nuestro enfoque pedagógico es una estrategia que va desde lo general hacia lo específico. En este sentido, creamos un mapa conceptual de los contenidos de la materia que los estudiantes usan como referencia, promoviendo el desarrollo de habilidades de asociación de conceptos a lo largo del curso. Asimismo, en las prácticas, los trabajos prácticos se abordan desde el principio del curso, permitiendo que los estudiantes apliquen y consoliden sus conocimientos desde una concepción general de la solución hacia lo particular.

Adicionalmente, incorporamos el uso de pruebas unitarias y un sistema de versionado. Las pruebas son creadas por el equipo docente y evalúan el comportamiento esperado de los algoritmos y las estructuras de datos que desarrollan los grupos de estudiantes. El cumplimiento de dichas pruebas es uno de los requisitos de aprobación de los trabajos prácticos, en conjunto con la correcta aplicación de los conceptos estudiados y las herramientas del lenguaje de programación utilizado. Por su parte, el uso del sistema de versionado fomenta el trabajo colaborativo desde el comienzo, aportando una valiosa experiencia para su futura práctica profesional, además de simplificar la revisión y retroalimentación docente.

En general, estos cambios han permitido destinar más tiempo a temas fundamentales como árboles, grafos y algoritmos asociados, asignando la mitad del curso a estos temas. Además, hemos introducido un tema adicional sobre blockchain como estructura de datos lineal, permitiendo a los estudiantes explorar un área de conocimiento actual.

Observamos que la adopción de Python mejoró la experiencia de aprendizaje en la asignatura. No obstante, identificamos la necesidad de fortalecer la orientación en la preparación de las presentaciones orales de los trabajos prácticos, para desarrollar una comunicación más efectiva. Por otro lado, notamos mayor interés y compromiso por parte de las y los estudiantes con la metodología propuesta por el equipo docente, tanto en su participación en la asignatura como en su asistencia a clases.