cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DataCite: Connecting Research, Advancing Knowledge
Creators: name: Edmunds, Rorie
Publisher: name: Zenodo
Year: 2024
Subjects: Persistent Identifiers
PID Infrastructure
Open Science
Japan
APAC
Consortia
DataCite
ORCID
AXIES
JaLC
JST

description: This event had the theme ‘As local as necessary, as international as possible’. It focussed on strengthening the Japanese persistent identifier (PID) community and fostering linkages between Japan PID infrastructure and the wider community in the Asia–Pacific (APAC) region and globally.

The agenda provided an orientation of PIDs and related services, as well as insights about ORCID and DataCite in the APAC region and the activities of our Consortia. Participants learnt about use cases of PID implementation in research workflows in Japan (and APAC), and how implementation has aligned with organizational goals: showcasing success stories and challenges.

Bringing people together for stimulating conversations around points of interest to the community that are not possible virtually, the event was an opportunity to meet others with an interest in the adoption of PIDs and Open Science principles.

This event was co-hosted by ORCID and DataCite alongside the Academic eXchange for Information Environment and Strategy and the Japan Link Center, who respectively lead ORCID’s and DataCite’s Consortia in Japan. It was supported by the Japan Science and Technology Agency. The event was co-located with the International Symposium on Data Science 2023 held on 11–15 December 2023 at the Science Council of Japan in Tokyo.
ADVERSE SELECTION, MORAL HAZARD, AND GROWER COMPLIANCE WITH BT CORN REFUGE
Creators: name: Mitchell, Paul D.
name: Zhu, En (John)
name: Hurley, Terrance M.
name: Mitchell, Paul D.
name: Zhu, En (John)
name: Hurley, Terrance M.
Publisher: name: Unknown
Year: 2004
Subjects: Crop Production/Industries

description: This paper develops a principal-agent model of farmer compliance with Bt corn refuge requirements intended to manage the evolution of resistance to the Bt toxin by insect pests. The model endogenizes the price of the technology, the audit rate, and the fine imposed on non-complying farmers when farmer willingness to pay for Bt corn and compliance effort is private information.
New Relationships between Galaxy Properties and Host Halo Mass, and the Role of Feedbacks in Galaxy Formation
Creators: name: Shankar, F.
name: Lapi, A.
name: Salucci, P.
name: De Zotti, G.
name: Danese, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new relationships between halo masses M_h and several galaxy properties, including r*-band luminosities L_r, stellar (M_star) and baryonic masses, stellar velocity dispersions (sigma), and black hole masses (M_BH). Approximate analytic expressions are given. In the galaxy halo mass range 3*10^(10) M_sun <= M_h <= 3*10^(13) M_sun the M_h-L_r, M_star-M_h, and M_BH-M_h are well represented by a double power law, with a break at M_h_break~3*10^(11) M_sun, corresponding to a mass in stars M_star~ 1.2*10^(10) M_sun, to a r*-band luminosity L_r~ 5*10^9 L_sun, to a stellar velocity dispersion sigma ~ 88 km/s, and to a black hole mass M_BH~ 9*10^(6) M_sun. The sigma-M_h relation can be approximated by a single power law, though a double power law is a better representation. We interpret these relations in terms of the effect of feedback from supernovae and from the active nucleus on the interstellar medium. We argue that the break of the power laws occurs at a mass which marks the transition between the dominance of the stellar and the AGN feedback.
description: Apj accepted; revised version for publication
Algebraic identities associated with KP and AKNS hierarchies
Creators: name: Dimakis, Aristophanes
name: Muller-Hoissen, Folkert
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q53; 35Q58; 16B99

description: Explicit KP and AKNS hierarchy equations can be constructed from a certain set of algebraic identities involving a quasi-shuffle product.
description: 6 pages, proceedings of Integrable Systems 2005, Prague
On-lattice coalescence and annihilation of immobile reactants in loopless lattices and beyond
Creators: name: Abad, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the behavior of the chemical reactions $A+A\to A+S$ and $A+A\to S+S$ (where the reactive species $A$ and the inert species $S$ are both assumed to be immobile) embedded on Bethe lattices of arbitrary coordination number $z$ and on a two-dimensional (2D) square lattice. For the Bethe lattice case, exact solutions for the coverage in the $A$ species in terms of the initial condition are obtained. In particular, our results hold for the important case of an infinite one-dimensional (1D) lattice ($z=2$). The method is based on an expansion in terms of conditional probabilities which exploits a Markovian property of these systems. Along the same lines, an approximate solution for the case of a 2D square lattice is developed. The effect of dilution in a random initial condition is discussed in detail, both for the lattice coverage and for the spatial distribution of reactants.
description: 23 pages, 10 eps figures, uses revtex4 style files
Quasi-two dimensional perturbations in duct flows under transverse magnetic field
Creators: name: Pothérat, Alban
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Inspired by the experiment from Moresco \& Alboussière (2004, J. Fluid Mech.), we study the stability of a liquid metal flow in a rectangular, electrically insulating duct with a steady homogeneous transverse magnetic field. The Lorentz force tends to eliminate velocity variations along the magnetic field, leading to a quasi-two dimensional base flow with Hartmann boundary layers near the walls perpendicular to the magnetic field, and Shercliff layers near the walls parallel to the field. Since the Lorentz force strongly opposes the growth of perturbations with a dependence along the magnetic field direction too, we represent the flow with Sommeria \& Moreau's (1982, J. Fluid Mech.) model, a two-dimensional shallow water model with linear friction accounting for the effect of the Hartmann layer. The simplicity of this model makes it possible to study the stability and transient growth of quasi-two dimensional perturbations over an extensive range of parameters up to the limit of high magnetic fields, where the Reynolds number based on the Shercliff layer thickness $Re/H^{1/2}$ becomes the only relevant parameter. Tollmien-Schlichting waves are the most linearly unstable mode, with a further unstable mode $H \gtrsim 42$. The flow is linearly unstable for $Re/H^{1/2}\gtrsim 48350$ and energetically stable for $Re/H^{1/2}\lesssim 65.32$. Between these two bounds, non-modal quasi-two dimensional perturbations undergo significant transient growth (between 2 and 7 times more than in the case of a purely 2D Poiseuille flow, and for much more subcritical values of $Re$). In the limit of a high magnetic field, the maximum gain $G_{max}$ associated to this transient growth varies as $G_{max} \sim (Re/Re_c)^{2/3}$ and occurs at time $t_{Gmax}\sim(Re/Re_c)^{1/3}$ for streamwise wavenumbers of the same order of magnitude as the critical wavenumber for the linear stability.
Extending Drawings of Graphs to Arrangements of Pseudolines
Creators: name: Arroyo, Alan
name: Bensmail, Julien
name: Richter, R. Bruce
Publisher: name: Journal of Computational Geometry
Year: 2021

description: In the recent study of crossing numbers, drawings of graphs that can be extended to an arrangement of pseudolines (pseudolinear drawings) have played an important role as they are a natural combinatorial extension of rectilinear (or straight-line) drawings. A characterization of the pseudolinear drawings of $K_n$ was found recently. We extend this characterization to all graphs, by describing the set of minimal forbidden subdrawings for pseudolinear drawings. Our characterization also leads to a polynomial-time algorithm to recognize pseudolinear drawings and construct the pseudolines when it is possible.
description: Journal of Computational Geometry, Vol. 12 No. 2 (2021)
MPEC 2024-A140 : 2024 AO3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 AO3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A short proof of the toughness of Delaunay triangulations
Creators: name: Biniaz, Ahmad
Publisher: name: Journal of Computational Geometry
Year: 2021

description: We present a self-contained short proof of the seminal result of Dillencourt (SoCG 1987 and DCG 1990) that Delaunay triangulations, of planar point sets in general position, are 1-tough. An important implication of this result is that Delaunay triangulations have perfect matchings. Another implication of our result is a proof of the conjecture of Aichholzer et al. (2010) that at least n points are required to block any n-vertex Delaunay triangulation.
description: Journal of Computational Geometry, Vol. 12 No. 1 (2021)
TESS observations of southern ultra fast rotating low mass stars
Creators: name: Ramsay, G.
name: Doyle, J. G.
name: Doyle, L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In our previous study of low mass stars using TESS, we found a handful which show a periodic modulation on a period <1 d but also displayed no flaring activity. Here we present the results of a systematic search for Ultra Fast Rotators (UFRs) in the southern ecliptic hemisphere which were observed in 2 min cadence with TESS. Using data from Gaia DR2, we obtain a sample of over 13,000 stars close to the lower main sequence. Of these, we identify 609 stars which lie on the lower main sequence and have a periodic modulation <1 d. The fraction of stars which show flares appears to drop significantly at periods <0.2 d. If the periods are a signature of the rotation rate, this would be a surprise, since faster rotators would be expected to have a stronger magnetic field and, therefore, produce more flares. We explore possible reasons for our finding: the flare inactive stars are members of binaries, in which case the stars rotation rate could have increased as the binary orbital separation reduced due to angular momentum loss over time, or that enhanced emission occurs at blue wavelengths beyond the pass band of TESS. Follow-up spectroscopy and flare monitoring at blue/ultraviolet wavelengths of these flare inactive stars are required to resolve this question.
description: Accepted for publication in MNRAS
CAUSALITY AMONG FED CATTLE MARKET VARIABLES: DIRECTED ACYCLIC GRAPHS ANALYSIS OF CAPTIVE SUPPLY
Creators: name: Lee, Andrew C.
name: Kim, Man-Keun
name: Lee, Andrew C.
name: Kim, Man-Keun
Publisher: name: Unknown
Year: 2004
Subjects: Research Methods/ Statistical Methods

description: In quantitative research, direction of causality among the variables is often assumed without a rigorous test. In this study, the directed acyclic graph (DAG) method was used to illuminate causal relationships among fed cattle industry variables, in particular, it was shown that captive supply causes spot market price to change.
Network Information Flow with Correlated Sources
Creators: name: Barros, Joao
name: Servetto, Sergio D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we consider a network communications problem in which multiple correlated sources must be delivered to a single data collector node, over a network of noisy independent point-to-point channels. We prove that perfect reconstruction of all the sources at the sink is possible if and only if, for all partitions of the network nodes into two subsets S and S^c such that the sink is always in S^c, we have that H(U_S|U_{S^c}) < \sum_{i\in S,j\in S^c} C_{ij}. Our main finding is that in this setup a general source/channel separation theorem holds, and that Shannon information behaves as a classical network flow, identical in nature to the flow of water in pipes. At first glance, it might seem surprising that separation holds in a fairly general network situation like the one we study. A closer look, however, reveals that the reason for this is that our model allows only for independent point-to-point channels between pairs of nodes, and not multiple-access and/or broadcast channels, for which separation is well known not to hold. This ``information as flow'' view provides an algorithmic interpretation for our results, among which perhaps the most important one is the optimality of implementing codes using a layered protocol stack.
description: Final version, to appear in the IEEE Transactions on Information Theory -- contains (very) minor changes based on the last round of reviews
Bimaadziwin (the good life) : sharing the living teachings of the people of Sagamok Anishnawbek : implications for education
Creators: name: Toulouse, Pamela Rose
Publisher: name: University of British Columbia
Year: 2009

description: This research is a presentation of the living teachings of the people of Sagamok First Nation; an Anishinabek (Ojibwe, Odawa and Pottawatomi) community located midway on the northern shores of Lake Huron in the province of Ontario. It is a conceptual exploration into the lived notion of bimaadziwin (primary translation is the goodlife) as defined by this community. This account is not only socio-historical, but is philosophical as well, offering an intimate journey into the lives of a People that have survived, struggled with and resisted the colonial process. Their living voices and lived stories embody the hope, dreams and examples of the reality of a People deriving from a strong culture, tradition and language. The experiences, philosophies and worldview of the People of Sagamok are presented textually (words, interviews, poetry) and symbolically (material documents, archival work, photos) in order to show the beauty and tensions of a community in reconstruction. This research is Ojibwe research, an insider's deliberate attempt to understand the nature of her home. This research is also an investigation of the 'his/story' of Anishinabek education, as embedded in a larger structure of imperialist domination and the future of Anishinabek education, as moving towards the recovery and honouring of 'our knowledge'. This body of work exemplifies emerging research methodologies that are reflexive and respectful of First Nation's protocols, shedding the boundaries of investigative practices beyond the colonial gaze.
Local routing in WSPD-based spanners
Creators: name: De Carufel, Jean-Lou
name: Bose, Prosenjit
name: Paradis, Frédérik
name: Dujmovic, Vida
Publisher: name: Journal of Computational Geometry
Year: 2021

description: The well-separated pair decomposition (WSPD) of the complete Euclidean graph defined on points in $R^2$, introduced by Callahan and Kosaraju [JACM, 42 (1): 67-90, 1995], is a technique for partitioning the edges of the complete graph based on length into a linear number of sets. Among the many different applications of WSPDs, Callahan and Kosaraju proved that the sparse subgraph that results by selecting an arbitrary edge from each set (called WSPD-spanner) is a $1 + 8/(s − 4)$-spanner, where $s > 4$ is the separation ratio used for partitioning the edges. Although competitive local-routing strategies exist for various spanners such as Yao-graphs, $\Theta$-graphs, and variants of Delaunay graphs, few local-routing strategies are known for any WSPD-spanner. Our main contribution is a local-routing algorithm with a near-optimal competitive routing ratio of $1 + O(1/s)$ on a WSPD-spanner. Specifically, using Callahan and Kosaraju’s fair split-tree, we show how to build a WSPD-spanner with spanning ratio $1 + 4/s + 4/(s − 2)$ which is a slight improvement over $1 + 8/(s − 4)$. We then present a 2-local and a 1-local routing algorithm on this spanner with competitive routing ratios of $1 + 6/(s − 2) + 4/s$ and $1 + 8/(s − 2) + 4/s + 8/s^2$, respectively. Moreover, we prove that there exists a point set for which our WSPD-spanner has a spanning ratio of at least $1 + 8/s$, thereby proving the near-optimality of its spanning ratio and the near-optimality of the routing ratio of both our routing algorithms.
description: Journal of Computational Geometry, Vol. 12 No. 1 (2021)
OBJECTIVE AND SUBJECTIVE KNOWLEDGE: IMPACTS ON CONSUMER DEMAND FOR GENETICALLY MODIFIED FOODS IN THE UNITED STATES AND THE EUROPEAN UNION
Creators: name: House, Lisa
name: Lusk, Jayson L.
name: Jaeger, Sara
name: Traill, W. Bruce
name: Moore, Melissa
name: Valli, Carlotta
name: Morrow, Bert
name: Yee, Wallace M.S.
name: House, Lisa
name: Lusk, Jayson L.
name: Jaeger, Sara
name: Traill, W. Bruce
name: Moore, Melissa
name: Valli, Carlotta
name: Morrow, Bert
name: Yee, Wallace M.S.
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: In the growing body of literature on consumer acceptance of genetically modified (GM) foods, there are significant differences on the impact of knowledge on acceptance of GM foods. One potential explanation is the manner in which knowledge is measured. The goal of this study is to differentiate and examine the impact of both subjective and objective knowledge related to acceptance of genetically modified foods. Data from surveys collected in the United States, England, and France is used.
SELF-INSURANCE AND THE UTILITY OF STANDARD RISK MANAGEMENT CONTRACTS
Creators: name: Makki, Shiva S.
name: Miranda, Mario J.
name: Makki, Shiva S.
name: Miranda, Mario J.
Publisher: name: Unknown
Year: 1998
Subjects: Risk and Uncertainty

description: This paper analyzes the potential trade offs and complementarities that exist between intra-year strategies employing annual price and yield risk contracts and inter-year self-insurance strategies involving intertemporal consumption substitution and borrowing, and examines whether standard crop insurance contracts can be made more useful to farmers if offered with a multiple-year horizon.
Controlling Metal-Insulator Transitions in Vanadium Oxide Thin Films by Modifying Oxygen Stoichiometry
Creators: name: Lee, Min-Han
name: Kalcheim, Yoav
name: del Valle, Javier
name: Schuller, Ivan K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Vanadium oxides are strongly correlated materials which display metal-insulator transitions as well as various structural and magnetic properties that depend heavily on oxygen stoichiometry. Therefore, it is crucial to precisely control oxygen stoichiometry in these materials, especially in thin films. This work demonstrates a high-vacuum gas evolution technique which allows for the modification of oxygen concentration in VOX thin films by carefully tuning thermodynamic conditions. We were able to control the evolution between VO2, V3O5, and V2O3 phases on sapphire substrates, overcoming the narrow phase stability of adjacent Magnéli phases. A variety of annealing routes were found to achieve the desired phases and eventually to control the metal-insulator transition (MIT). The pronounced MIT of the transformed films along with the detailed structural investigations based on x-ray diffraction measurements and reciprocal space mapping show that optimal stoichiometry is obtained and stabilized. Using this technique, we find that the thin film V-O phase diagram differs from that of the bulk material due to strain and finite size effects. Our study demonstrates new pathways to strategically tune the oxygen stoichiometry in complex oxides and provides a roadmap for understanding the phase stability of VOX thin films.
ESTIMATING GENDER DIFFERENCES IN AGRICULTURAL PRODUCTIVITY: BIASES DUE TO OMISSION OF GENDER-INFLUENCED VARIABLES AND ENDOGENEITY OF REGRESSORS
Creators: name: Lilja, Nina K.
name: Randolph, Thomas F.
name: Diallo, Abrahmane
name: Lilja, Nina K.
name: Randolph, Thomas F.
name: Diallo, Abrahmane
Publisher: name: Unknown
Year: 1998
Subjects: Labor and Human Capital
Productivity Analysis

description: This study evaluates managerial differences between men and women and assesses the degree of bias introduced by omission of gender-influenced variables and ignoring the endogeneity of farmer characteristics and input levels. The results also give insight to improving research methods for isolating the gender impact on productivity.
Efficient Evaluation of Exact Exchange for Periodic Systems via Concentric Atomic Density Fitting
Creators: name: Wang, Xiao
name: Lewis, Cannada A.
name: Valeev, Edward F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The evaluation of exact (Hartree--Fock, HF) exchange operator is a crucial ingredient for the accurate description of electronic structure in periodic systems through ab initio and hybrid density functional approaches. An efficient formulation of periodic HF exchange in LCAO representation presented here is based on the concentric atomic density fitting (CADF) approximation, a domain-free local density fitting approach in which the product of two atomic orbitals (AOs) is approximated using a linear combination of fitting basis functions centered at the same nuclei as the AOs in that product. Significant reduction in the computational cost of exact exchange is demonstrated relative to the conventional approach due to avoiding the need to evaluate four-center two-electron integrals, with sub-millihartree/atom errors in absolute Hartree-Fock energies and good cancellation of fitting errors in relative energies. Novel aspects of the evaluation of the Coulomb contribution to the Fock operator, such as the use of real two-center multipole expansions and spheropole-compensated unit cell densities are also described.
description: 33 pages, 3 figures
An adaptive and energy-maximizing control of wave energy converters using extremum-seeking approach
Creators: name: Parrinello, Luca
name: Dafnakis, Panagiotis
name: Bracco, Giovanni
name: Naseradinmousavi, Peiman
name: Mattiazzo, Giuliana
name: Bhalla, Amneet Pal Singh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we systematically investigate the feasibility of different extremum-seeking (ES) control schemes to improve the conversion efficiency of wave energy converters (WECs). Continuous-time and model-free ES schemes based on the sliding mode, relay, least-squares gradient, self-driving, and perturbation-based methods are used to improve the mean extracted power of a heaving point absorber subject to regular and irregular waves. This objective is achieved by optimizing the resistive and reactive coefficients of the power take-off (PTO) mechanism using the ES approach. The optimization results are verified against analytical solutions and the extremum of reference-to-output maps. The numerical results demonstrate that except for the self-driving ES algorithm, the other four ES schemes reliably converge for the two-parameter optimization problem, whereas the former is more suitable for optimizing a single-parameter. The results also show that for an irregular sea state, the sliding mode and perturbation-based ES schemes have better convergence to the optimum, in comparison to other ES schemes considered here. The convergence of PTO coefficients towards the performance-optimal values are tested for widely different initial values, in order to avoid bias towards the extremum. We also demonstrate the adaptive capability of ES control by considering a case in which the ES controller adapts to the new extremum automatically amidst changes in the simulated wave conditions.
Dimensional Regularisation and Factorisation Schemes in the BFKL Equation at Subleading Leve
Creators: name: Ciafaloni, M.
name: Colferai, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the anomalous dimensions and coefficient functions generated by the BFKL equation in 4+2 epsilon dimensions, by investigating both running coupling effects, and the inclusion of the full next-to-leading kernel. After generalising the Fourier representation of the solutions to this case, we analyse the beta-dependent renormalisation-group factorisation of anomalous dimension and coefficient contributions to the gluon density. We derive on this basis the normalisation factor of the Q0-scheme with respect to the MSbar-scheme, including beta-dependent corrections to it, and we outline the derivation of the full next-to-leading contributions. We also provide an expression for the resummed gamma_qg in the MSbar-scheme which exhibits its universality and is explicit up to quadratures.
description: 32 pages, 2 figures
Keplerian discs around post-AGB stars: a common phenomenon?
Creators: name: De Ruyter, S.
name: Van Winckel, H.
name: Maas, T.
name: Evans, T. Lloyd
name: Waters, L. B. F. M.
name: Dejonghe, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: We aim at showing that the broad-band SED characteristics of our sample of post-AGB stars are best interpreted, assuming the circumstellar dust is stored in Keplerian rotating passive discs. Methods: We present a homogeneous and systematic study of the Spectral Energy Distributions (SEDs) of a sample of 51 post-AGB objects. The selection criteria to define the whole sample were tuned to cover the broad-band characteristics of known binary post-AGB stars. The whole sample includes 20 dusty RV Tauri stars from the General Catalogue of Variable Stars (GCVS). We supplemented our own Geneva optical photometry with literature data to cover a broad range of fluxes from the UV to the far-IR. Results: All the SEDs display very similar characteristics: a large IR excess with a dust excess starting near the sublimation temperature, irrespective of the effective temperature of the central star. Moreover, when available, the long wavelength fluxes show a black-body slope indicative of the presence of a component of large mm sized grains. Conclusions: We argue that in all systems, gravitationally bound dusty discs are present. The discs must be puffed-up to cover a large opening angle for the central star and we argue that the discs have some similarity with the passive discs detected around young stellar objects. We interpret the presence of a disc to be a signature for binarity of the central object, but this will need confirmation by long-term monitoring of the radial velocities. We argue that dusty RV Tauri stars are those binaries which happen to be in the Population II instability strip.
description: 29 pages, 5 figures, accepted for publication in A&A
A weighted approach to the maximum cardinality bipartite matching problem with applications in geometric settings
Creators: name: Lahn, Nathaniel Adam
name: Raghvendra, Sharath
Publisher: name: Journal of Computational Geometry
Year: 2021

description: We present a weighted approach to compute a maximum cardinality matching in an arbitrary bipartite graph. Our main result is a new algorithm that takes as input a weighted bipartite graph $G(A\cup B,E)$ with edge weights of $0$ or $1$. Let $w \leq n$ be an upper bound on the weight of any matching in $G$. Consider the subgraph induced by all the edges of $G$ with a weight $0$. Suppose every connected component in this subgraph has $O(r)$ vertices and $O(mr/n)$ edges. We present an algorithm to compute a maximum cardinality matching in $G$ in $\tilde{O}( m(\sqrt{w}+ \sqrt{r}+\frac{wr}{n}))$ time. When all the edge weights are $1$ (symmetrically when all weights are $0$), our algorithm will be identical to the well-known Hopcroft-Karp (HK) algorithm, which runs in $O(m\sqrt{n})$ time. However, if we can carefully assign weights of $0$ and $1$ on its edges such that both $w$ and $r$ are sub-linear in $n$ and $wr=O(n^{\gamma})$ for $\gamma < 3/2$, then we can compute a maximum cardinality matching in $o(m\sqrt{n})$ time. Using our algorithm, we obtain a new $\tilde{O}(n^{4/3}/\varepsilon^3)$ time algorithm to compute an $\varepsilon$-approximate bottleneck matching of $A,B\subset \mathbb{R}^2$ and a $\frac{1}{\varepsilon^{O(d)}}n^{1+\frac{d-1}{2d-1}}\mathrm{poly}\log n$ time algorithm for computing an $\varepsilon$-approximate bottleneck matching in $d$-dimensions. All previous algorithms take $\Omega(n^{3/2})$ time. Our algorithm also applies to any graph $G(A \cup B,E)$ that has an easily computable balanced vertex separator of size $|V'|^{\delta}$, for every subgraph $G'(V',E')$ where $\delta\in [1/2,1)$. By applying our algorithm, we can compute a maximum matching in $\tilde{O}(mn^{\frac{\delta}{1+\delta}})$ time, improving upon the $O(m\sqrt{n})$ time taken by the HK-Algorithm.
description: Journal of Computational Geometry, Vol. 11 No. 2: Special Issue of Selected Papers from SoCG 2019
Long-Time Correlations in the Stochastic Regime
Creators: name: Karney, Charles F. F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Accelerator Physics (physics.acc-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The phase space for Hamiltonians of two degrees of freedom is usually divided into stochastic and integrable components. Even when well into the stochastic regime, integrable orbits may surround small stable regions or islands. The effect of these islands on the correlation function for the stochastic trajectories is examined. Depending on the value of the parameter describing the rotation number for the elliptic fixed point at the center of the island, the long-time correlation function may decay as t^-5 or exponentially, but more commonly it decays much more slowly (roughly as t^-1). As a consequence these small islands may have a profound effect on the properties of the stochastic orbits. In particular, there is evidence that the evolution of a distribution of particles is no longer governed by a diffusion equation.
description: Plain TeX, 30 pages, 8 figures. Reprinted in "Hamiltonian Dynamical Systems", edited by R. S. MacKay and J. D. Meiss (Adam-Hilger, Bristol, 1987), pp. 585-605
ESTIMATION OF SHADOW PRICES OF UNDESIRABLE OUTPUTS: AN APPLICATION TO UK DAIRY FARMS
Creators: name: Hadley, David
name: Hadley, David
Publisher: name: Unknown
Year: 1998
Subjects: Environmental Economics and Policy
Livestock Production/Industries

description: The parameters of an output distance function are estimated utilising unbalanced panel data from 300 UK dairy farms. Potential nitrate contamination of groundwater is modelled within the production process as an undesirable output and shadow prices (which can be interpreted as marginal abatement costs) for such contamination are calculated.
Ultra-high-resolution imaging of moiré lattices and superstructures using scanning microwave impedance microscopy under ambient conditions
Creators: name: Lee, Kyunghoon
name: Utama, M. Iqbal Bakti
name: Kahn, Salman
name: Samudrala, Appalakondaiah
name: Leconte, Nicolas
name: Yang, Birui
name: Wang, Shuopei
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Zhang, Guangyu
name: Weber-Bargioni, Alexander
name: Crommie, Michael
name: Ashby, Paul D.
name: Jung, Jeil
name: Wang, Feng
name: Zettl, Alex
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional heterostructures with layers of slightly different lattice vectors exhibit a new periodic structure known as moire lattices. Moire lattice formation provides a powerful new way to engineer the electronic structure of two-dimensional materials for realizing novel correlated and topological phenomena. In addition, superstructures of moire lattices can emerge from multiple misaligned lattice vectors or inhomogeneous strain distribution, which offers an extra degree of freedom in the electronic band structure design. High-resolution imaging of the moire lattices and superstructures is critical for quantitative understanding of emerging moire physics. Here we report the nanoscale imaging of moire lattices and superstructures in various graphene-based samples under ambient conditions using an ultra-high-resolution implementation of scanning microwave impedance microscopy. We show that, quite remarkably, although the scanning probe tip has a gross radius of ~100 nm, an ultra-high spatial resolution in local conductivity profiles better than 5 nm can be achieved. This resolution enhancement not only enables to directly visualize the moire lattices in magic-angle twisted double bilayer graphene and composite super-moire lattices, but also allows design path toward artificial synthesis of novel moire superstructures such as the Kagome moire from the interplay and the supermodulation between twisted graphene and hexagonal boron nitride layers.
description: 16 pages, 5 figures
Topological data analysis in information space
Creators: name: Edelsbrunner, Herbert
name: Virk, Žiga
name: Wagner, Hubert
Publisher: name: Journal of Computational Geometry
Year: 2021

description: Various kinds of data are routinely represented as discrete probability distributions. Examples include text documents summarized by histograms of word occurrences and images represented as histograms of oriented gradients. Viewing a discrete probability distribution as a point in the standard simplex of the appropriate dimension, we can understand collections of such objects in geometric and topological terms. Importantly, instead of using the standard Euclidean distance, we look into dissimilarity measures with information-theoretic justification, and we develop the theory needed for applying topological data analysis in this setting. In doing so, we emphasize constructions that enable the usage of existing computational topology software in this context.
description: Journal of Computational Geometry, Vol. 11 No. 2: Special Issue of Selected Papers from SoCG 2019
TESTING FOR NONCOMPETITIVE BEHAVIOR IN THE U.S. FOOD INDUSTRY
Creators: name: Ussif, Al-Amin M.
name: Lambert, David K.
name: Ussif, Al-Amin M.
name: Lambert, David K.
Publisher: name: Unknown
Year: 1998
Subjects: subject: Agribusiness
subject: Marketing
subject: FOS: Economics and business

description: Market structure is tested in 47 subsectors of the US food industry between 1958-1994. All industries exert market power in at least some of the sample years. Deadweight loss estimates resulting from noncompetitive behavior ranging from over $5 billion in soft drinks to under $1 million in the malt industry.
Direct observation of dijets in central Au+Au collisions with STAR
Creators: name: Magestro, Dan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present first results of azimuthal (Delta phi) correlations of high transverse momentum (p_T) hadrons from the high-statistics Au+Au dataset collected at RHIC in 2004. Previous correlations measurements observed the disappearance of back-to-back (Delta phi ~ pi) correlations in central Au+Au collisions, supporting the emerging picture of parton energy loss in dense QCD matter. In the present analysis, increasing the p_T thresholds reveals a narrow back-to-back dijet peak which emerges above the decreasing combinatoric background. We study the possible medium modification of the dijet fragmentation function and compare to models, to place constraints on the nature and magnitude of in-medium energy loss.
description: Talk given at Quark Matter 2005, 18th International Conference on Nucleus-Nucleus Interactions, August 4-9, 2005, Budapest, Hungary. Formatting fixed
TRADE, TECHNOLOGY AND LABOR PRODUCTIVITY EFFECTS ON THE DEMAND FOR SKILLED AND UNSKILLED WORKERS: IMPLICATIONS FOR RURAL AREAS
Creators: name: Lee, Chinkook
name: Schluter, Gerald E.
name: Lee, Chinkook
name: Schluter, Gerald E.
Publisher: name: Unknown
Year: 1998
Subjects: subject: International Relations/Trade
subject: Labor and Human Capital
subject: Structural Analysis
subject: International Trade Impacts
subject: Skilled-Unskilled Wage Gap

description: An I/O model of U.S. is used to examine the effects of trade and domestic consumption on the separate and interactive effects of trade, technology, and labor productivity on the demand for skilled and unskilled workers for 1972, 1987, and 1993. The results suggest that trade has not been the major contributor to changes in demand for skilled vs. unskilled labor during the period examined, counter to the continuing debate on theory and on evidence supporting the trade- widening wage gap linkage. We found the ratio of high skilled to low-skilled workers was higher for exports than imports and has risen over time, suggesting that U. S. has moved toward more skilled-labor intensive exports. The effect of trade on rural workers is to reinforce structural trends already working to the disadvantage of rural workers.
DISCUSSANT'S COMMENTS FOR AMERICAN AGRICULTURAL ECONOMICS ASSOCIATION ANNUAL MEETING, SELECTED PAPERS SESSION SP-4Y: "PRICING OF ENVIRONMENTAL GOODS: MEASUREMENT AND EFFICIENCY ISSUES"
Creators: name: Phaneuf, Daniel J.
name: Phaneuf, Daniel J.
Publisher: name: Unknown
Year: 1998
Subjects: Environmental Economics and Policy

description: Techniques for measuring amenity and nonuse values are presented using advances in spatial econometrics and hedonic models. The session also explores the efficiency of block-rate pricing and the appropriateness of "Green Box" subsidies. Papers include: Measuring the Benefits of Air Quality Improvement: A Spatial Hedonic Approach, Chong Won Kim, Korea Research Institute for Human Settlements; Tim Phipps, West Virginia University; Luc Anselin, West Virginia University. The Value of Open Spaces for Residential Land Prices & Land Use Change: A Hedonic & Duration Model Analysis, Jacqueline Geoghegan, Clark University; Nancy Bockstael, University of Maryland. "Green Box" Measures for Agricultural Support: How Decoupled Can They Really Be? Investigation Within SAM and CGE Frameworks, Serdar Sayan and Ela Tin, Bilkent University. The Long-Run Efficiency of Block-Rate Pricing Bar-Shira Ziv and Israel Finkelshtain, Hebrew University of Jerusalem.
Journey into the world of the school : high school students’ understandings of citizenship in B.C. and Québec
Creators: name: Lévesque, Stéphane
Publisher: name: University of British Columbia
Year: 2009

description: Regional, multicultural, and national divergences in Canadian politics and education have contributed to the emergence of different forms of nationalism, identity, and citizenship in Canada. The practice and content of secondary education in B.C. and Québec illustrate this general proposition. Two multi-ethnic high schools, one in Québec (Montréal) and one in B.C. (Vancouver), provide a window into Québec history (grade 10) and B.C. social studies (grade 11) classrooms. These classes are used to examine how students construct and understand their citizenship. Key concepts (citizenship rights, participation, pluralism, collective identity) guided this research. Using a multiple case study design, this qualitative study employed multiple data collection. In addition to the analysis of the documentary record, I observed and interviewed B.C. and Québec high school students, history and social studies teachers, and finally staff from each school. The study generated findings on citizenship education practice and learning. In both provinces, citizenship education is the raison d'être of history and social studies. Despite divergent programs and teaching approaches, teachers at both sites recognize the necessity of preparing students for the exercise of democratic citizenship. Students at both sites accord importance to the key citizenship concepts introduced in their history/social studies classes. Yet, contrasts emerge in the findings between francophone Québécois and anglophone British Columbian students, particularly in terms of collective identity. The findings suggest that theoretical discussions on multicultural and multinational citizenship in political theory does not adequately take into account all the complex views of B.C. and Québec student informants. This study concludes with further research into the study of students' conceptions of citizenship.
OPEN REGIONALISM IN APEC: IMPACTS ON U.S. AGRICULTURE AND TRADE
Creators: name: Coyle, William T.
name: Wang, Zhi
name: Coyle, William T.
name: Wang, Zhi
Publisher: name: Unknown
Year: 1998
Subjects: Institutional and Behavioral Economics
International Relations/Trade

description: APEC's "open regionalism" calls for free-trade in APEC but with benefits also accruing to non-APEC members. This study shows that "open regionalism" provides strong incentives for non-APEC economies to also liberalize their policies to maintain competitiveness. Inclusion of agriculture is critical to total U.S. welfare gains because of current high protection rates in East Asia.
TESTS ON SEASONAL UNIT ROOTS IN TAIWAN'S VEGETABLE PRICES
Creators: name: Lei, Li-Fen
name: Lei, Li-Fen
Publisher: name: Unknown
Year: 1998
Subjects: Crop Production/Industries
Demand and Price Analysis

description: Taiwan's retail and farm prices were examined for unit roots at various seasonal frequencies. The results show that no unit roots exist at any seasonal frequency. Additionally, a unit root exists at the zero frequency in marketing margins, reflecting that retail and farm prices are not co-integrated at the long-run frequency.
CONNECTING TAXES AND WILLINGNESS TO PAY FOR FARMLAND PROTECTION: A COMPARISON OF LOCAL AND STATE FUNDED ALTERNATIVES IN NEW YORK
Creators: name: Harvey, David A.
name: Poe, Gregory L.
name: Bills, Nelson L.
name: Harvey, David A.
name: Poe, Gregory L.
name: Bills, Nelson L.
Publisher: name: Unknown
Year: 1998
Subjects: Agricultural and Food Policy
Public Economics

description: The costs of tax relief for New York agricultural landowners is compared with the willingness-to-pay for farmland protection as measured in valuation research. Under an income tax rebate, the program cost is positively related with the perceived household benefits, whereas this trend is reversed under a local property tax exemption.
TECHNOLOGICAL PERFORMANCE IN MEAT PROCESSING AND IMPLICATIONS FOR POLICY
Creators: name: Xia, Yin
name: Buccola, Steven T.
name: Xia, Yin
name: Buccola, Steven T.
Publisher: name: Unknown
Year: 2000
Subjects: Industrial Organization
Livestock Production/Industries

description: We develop a general model of processing cost, output demand, and factor demand in the U.S. meat processing industries, allowing for capital quasi-fixity and imperfectly competitive pricing. The model is used to analyze the sources and nature of size economies and technical change in the meat sector.
Doppler imaging of Speedy Mic using the VLT, Fast spot evolution on a young K-dwarf star
Creators: name: Wolter, U.
name: Schmitt, J. H. M. M.
name: van Wyk, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the short-term evolution of starspots on the ultrafast-rotating star HD197890 ("Speedy Mic" = BO Mic, K 0-2V, P_rot = 0.380 d) based on two Doppler images taken about 13 stellar rotations apart. Each image is based on spectra densely sampling a single stellar rotation. The images were reconstructed by our Doppler imaging code CLDI (Clean-like Doppler imaging) from line profiles extracted by spectrum deconvolution. Our Doppler images constructed from two independent wavelength ranges agree well on scales down to 10 degrees on the stellar surface. In conjunction with nearly parallel V-band photometry our observations reveal a significant evolution of the spot pattern during as little as two stellar rotations. We suggest that such a fast spot evolution demands care when constructing Doppler images of highly active stars based on spectral time series extending over several stellar rotations. The fast intrinsic spot evolution on BO Mic impedes the determination of a surface differential rotation; in agreement with earlier results by other authors we determine an upper limit of |alpha| < 0.004 +- 0.002.
An experimental study of forbidden patterns in geometric permutations by combinatorial lifting
Creators: name: Goaoc, Xavier
name: Holmsen, Andreas
name: Nicaud, Cyril
Publisher: name: Journal of Computational Geometry
Year: 2021

description: We study the problem of deciding if a given triple of permutations can be realized as geometric permutations of disjoint convex sets in $\mathbb{R}^3$. We show that this question, which is equivalent to deciding the emptiness of certain semi-algebraic sets bounded by cubic polynomials, can be ``lifted'' to a purely combinatorial problem. We propose an effective algorithm for that problem, and use it to gain new insights into the structure of geometric permutations. In particular, we prove that all triples of permutations of size $5$ are realizable, and give a complete list of triples of size $6$ that are not.
description: Journal of Computational Geometry, Vol. 11 No. 2: Special Issue of Selected Papers from SoCG 2019
Holistic framework to help students learn effectively from research-validated self-paced learning tools
Creators: name: Marshman, Emily
name: DeVore, Seth
name: Singh, Chandralekha
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: With limited time available in the classroom, e-learning tools can supplement in-class learning by providing opportunities for students to study and learn outside of class. Such tools can be especially helpful for students who lack adequate prior preparation. However, one critical issue is ensuring that students, especially those in need of additional help, engage with the tools as intended. Here we first discuss an empirical investigation in which students in a large algebra-based physics course were given opportunities to work through research-validated tutorials outside of class as self-study tools. Students were provided these optional tutorials after traditional instruction in relevant topics and were then given quizzes that included problems that were identical to the tutorial problems with regard to the physics principles involved but had different contexts. We find that students who worked through the tutorials as self-study tools struggled to transfer their learning to solve problems that used the same physics principles. On the other hand, students who worked on the tutorials in supervised, one-on-one situations performed significantly better than them. These empirical findings suggest that many introductory physics students may not engage effectively with self-paced learning tools unless they are provided additional incentives and support, e.g., to aid with self-regulation. Inspired by the empirical findings, we propose a holistic theoretical framework to help create learning environments in which students with diverse backgrounds are provided support to engage effectively with self-study tools.
description: accepted Phys. Rev. PER. arXiv admin note: substantial text overlap with arXiv:1606.00518