cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Las formas de la solidaridad en movimientos de trabajadores desocupados de la ciudad de Resistencia -Chaco
Creators: name: Itatí, Nuñez Cyntia
Publisher: name: Sociedad y Discurso
Year: 2014

description: De un tiempo a esta parte, los análisis en torno a la acción colectiva reconocen como factor primario para el éxito de las organizaciones los vínculos solidarios y afectivos que permiten establecer lazos duraderos basados en la construcción de una identidad colectiva. Sin embargo, la solidaridad es un concepto esquivo. Dentro de este término se despliegan una diversidad de acciones y modos de significarla que escapan a dicotomías clásicas con las cuales se ha tratado de comprenderla. Dentro de términos individualistas, sea como acción utilitarista, sea como filantropía la solidaridad es unilateral. Sin embargo, posturas teóricas más recientes han recuperado el concepto de reciprocidad -basada en la teoría del Don elaborada por Mauss- pues ésta les ha permitido comprender las formas de relacionamiento actual en franca ventaja sobre el par dicotómico planteado.
Los análisis que aquí presentaremos son parte de un trabajo de investigación de tipo cualitativa que recupera las nociones de comunidad, solidaridad y lazo social en Movimientos de Trabajadores Desocupados de la Cuidad de Resistencia - Chaco (Argentina), considerando que estos colectivos ponen en acción modos de hacer y de relacionarse que discuten los órdenes sociales actuales y nos permiten pensar en perspectivas alternativas para analizarlos. Específicamente, buscamos revisar con que sentidos los MTD están utilizando la noción de solidaridad, en cuales contextos de aplicación y con qué efectos sociales, de manera que podamos acercarnos a los múltiples modos de comprenderla y transformarla.
description: Sociedad y Discurso, No 25 (2014)
Index theory and Groupoids
Creators: name: Debord, Claire
name: Lescure, Jean-Marie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L80, 58B34, 19K35, 19K56, 58H05

description: This paper collects the notes of a serie of lectures given by the two authors during the summer school "Geometric and topological methods for Quantum Field Theory" at Villa de Leyva, Colombia, summer 2007. These lecture notes are mainly devoted to a proof using groupoids and $KK$-theory of Atiyah-Singer index theorem on compact smooth manifolds. We will present an elementary introduction to groupoids, $C^*$-algebras, $KK$-theory and pseudodifferential calculus on groupoids. We will finish by showing that the point of view adopted here generalizes to the case of conical pseudo-manifolds.
Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
Creators: name: Zhang, Bing
name: Fan, Y. Z.
name: Dyks, Jaroslaw
name: Kobayashi, Shiho
name: Meszaros, Peter
name: Burrows, David N.
name: Nousek, John A.
name: Gehrels, Neil
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (Abridged) The Swift X-Ray Telescope (XRT) reveals some interesting features of early X-ray afterglows, including a distinct rapidly decaying component preceding the conventional afterglow component in many sources, a shallow decay component before the more ``normal'' decay component observed in a good fraction of GRBs (e.g. GRB 050128, GRB 050315, GRB 050319, and GRB 050401), and X-ray flares in nearly half of the afterglows (e.g. GRB 050406, GRB 050502B, GRB 050607, and GRB 050724). In this paper, we systematically analyze the possible physical processes that shape the properties of the early X-ray afterglow lightcurves, and use the data to constrain various models. We suggest that the steep decay component is consistent with the tail emission of the prompt gamma-ray bursts and/or of the X-ray flares. This provides clear evidence that the prompt emission and afterglow emission are two distinct components, supporting the internal origin of the GRB prompt emission. The shallow decay segment observed in a group of GRBs suggests that the forward shock keeps being refreshed for some time. This might be caused either by a long-lived central engine, or by a power law distribution of the shell Lorentz factors, or else by the deceleration of a Poynting flux dominated flow. X-ray flares suggest that the GRB central engine is still active after the prompt gamma-ray emission is over, but with a reduced activity at later times. In some cases, the central engine activity even extends days after the burst trigger. Analyses of early X-ray afterglow data reveal that GRBs are indeed highly relativistic events. Early afterglow data of many bursts, starting from the beginning of the XRT observations, are consistent with the afterglow emission from an interstellar medium (ISM) environment.
description: emulateapj, 19 pages, ApJ, in press. Conclusions unchanged
The role of catechol-o-methyltransferase val158met polymorphism in the placebo and morphine response in patients with pain due to diabetic polyneuropathy
Creators: name: Tomalik-Scharte, Dorota
name: Burian, Maria
name: Froehlich, Marcel
name: Thömmes, Guido
name: Sohns, Melanie
name: Rengelshausen, Jens
Publisher: name: F1000Research
Year: 2016

description: Background and aims
Identification of factors contributing to placebo response may affect trial design and treatment optimization. The val158met polymorphism (rs4680) in catechol-o-methyltransferase (COMT) was recently suggested as a biomarker of placebo response. We studied the role of this polymorphism in pain intensity after placebo and morphine treatment in patients with diabetic polyneuropathy (DPN).

Conclusions
In this exploratory cohort of DPN pain patients, the val158met COMT polymorphism did not affect placebo or morphine response. Further studies are warranted to evaluate its potential role as a biomarker in different patient populations.
Revisiting and attributing the global controls over terrestrial ecosystem functions of climate and plant traits at FLUXNET sites via causal graphical models
Creators: name: Shi, Haiyang
name: Luo, Geping
name: Hellwich, Olaf
name: Kurban, Alishir
name: De Maeyer, Philippe
name: Van De Voorde, Tim
Publisher: name: Copernicus GmbH
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
subject: FLUXNET flux stations
subject: terrestrial ecosystem functions of climate
subject: climate traits
subject: plant traits
subject: ecosystem functions

description: Using statistical methods that do not directly represent the causality between variables to attribute climate and plant traits as controlling ecosystem functions may lead to biased perceptions. We revisited this issue using a causal graphical model, the Bayesian network (BN), capable of quantifying causality by conditional probability tables. Based on expert knowledge and climate, vegetation, and ecosystem function data from the FLUXNET flux stations, we constructed a BN representing the causal relationship of climate–plant-trait–ecosystem functions. Based on the sensitivity analysis function of the BN, we attributed the control of climate and plant traits over ecosystem functions and compared the results with those based on random forests and correlation analysis. The main conclusions of this study include the following: BN can be used for the quantification of causal relationships between complex ecosystems in response to climate change and enables the analysis of indirect effects among variables. The causality reflected in the BN is as good as the expert knowledge of the causal links. Compared to BN, the feature importance difference between “mean vapor pressure deficit and cumulative soil water index” and “maximum leaf area index and maximum vegetation height” reported by random forests is higher and can be overestimated. With the causality relation between correlated variables constructed, a BN-based sensitivity analysis can reduce the uncertainty in quantifying the importance of correlated variables. The understanding of the mechanism of indirect effects of climate variables on ecosystem functions through plant traits can be deepened by the chain casuality quantification in BNs.
Malodor Detection for FSM Technologies by an Integrated Gas Sensors System
Creators: name: Siddharth Kawadiya
name: Coggan, Peter
name: Welling, Claire
name: Grego, Sonia
name: Deshusses, Marc
Publisher: name: Gates Open Research
Year: 2019

description: Malodors in and around toilets, and released during fecal sludge management activities remain an important risk factor for adoption of sanitation products and technologies. Many challenges and knowledge gaps exist ranging from identifying odor release points, quantifying odor emissions, adopting designs and best practices that minimize odors, to testing for compliance. One critical need is to develop an instrument that can monitor odor, even crudely, to provide feedback in the event a significant system malfunction. This research evaluated the technical feasibility of using low costs gas sensors and pattern recognition algorithms for an early warning system for malodor associated with FSM.
COVID-19 and Social Distancing: Disparities in Mobility Adaptation between Income Groups
Creators: name: Iio, Kentaro
name: Guo, Xiaoyu
name: Kong, Xiaoqiang "Jack"
name: Rees, Kelly
name: Wang, Xiubin Bruce
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In response to the coronavirus disease 2019 (COVID-19) pandemic, governments have encouraged and ordered citizens to practice social distancing, particularly by working and studying at home. Intuitively, only a subset of people have the ability to practice remote work. However, there has been little research on the disparity of mobility adaptation across different income groups in US cities during the pandemic. The authors worked to fill this gap by quantifying the impacts of the pandemic on human mobility by income in Greater Houston, Texas. In this paper, we determined human mobility using pseudonymized, spatially disaggregated cell phone location data. A longitudinal study across estimated income groups was conducted by measuring the total travel distance, radius of gyration, number of visited locations, and per-trip distance in April 2020 compared to the data in a baseline. An apparent disparity in mobility was found across estimated income groups. In particular, there was a strong negative correlation ($ρ$ = -0.90) between a traveler's estimated income and travel distance in April. Disparities in mobility adaptability were further shown since those in higher income brackets experienced larger percentage drops in the radius of gyration and the number of distinct visited locations than did those in lower income brackets. The findings of this study suggest a need to understand the reasons behind the mobility inflexibility among low-income populations during the pandemic. The study illuminates an equity issue which may be of interest to policy makers and researchers alike in the wake of an epidemic.
description: 13 pages, 7 figures
Electrostatic theory for imaging experiments on local charges in quantum Hall systems
Creators: name: Pereira, Ana L. C.
name: Chalker, J. T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use a simple electrostatic treatment to model recent experiments on quantum Hall systems, in which charging of localised states by addition of integer or fractionally-charged quasiparticles is observed. Treating the localised state as a compressible quantum dot or antidot embedded in an incompressible background, we calculate the electrostatic potential in its vicinity as a function of its charge, and the chemical potential values at which its charge changes. The results offer a quantitative framework for analysis of the observations.
description: 4 pages, 3 figures
Cross-Hedging Fishmeal: Exploring Corn and Soybean Meal Futures Contracts
Creators: name: Parcell, Joseph L.
name: Boessen, Christian R.
name: Altman, Ira J.
name: Sanders, Dwight R.
name: Parcell, Joseph L.
name: Boessen, Christian R.
name: Altman, Ira J.
name: Sanders, Dwight R.
Publisher: name: Unknown
Year: 2008
Subjects: Crop Production/Industries
Risk and Uncertainty

description: During 2006 the fishmeal price nearly doubled from $500MT to over $900MT. The objective of this research is to determine the optimal cross-hedge ratio between fishmeal and soybean meal and corn, and corresponding hedging weight between corn and soybean. Results indicate all hedging weight should be placed on the corn futures contract. This is an interesting result since prior fishmeal cross-hedging research has not analyzed the corn futures contract as a risk management mechanism.
Language lessons: classificatory verbs, questions and answers
Creators: name: Parker, Verdena
name: Chase, Sara
name: Lee-Wynant, Tyler
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio files VP-160816-02 and VP-160816-03: language lessons: practicing passing objects to people with different classificatory verbs (VP-160816-02); practicing questions and answers in Hupa (VP-160816-03).
Flagellar length control in monoflagellates by motorized transport: growth kinetics and correlations of length fluctuations
Creators: name: Patra, Swayamshree
name: Chowdhury, Debashish
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: How does a cell self-organize so that its appendages attain specific lengths that are convenient for their respective functions? What kind of 'rulers' does a cell use to measure the length of these appendages? How does a cell transport structure building materials between the cell body and distal tips of these appendages so as to regulate their dynamic lengths during various stages of its lifetime? Some of these questions are addressed here in the context of a specific cell appendage called flagellum (also called cilium). A "time of flight" (ToF) mechanism, adapted from the pioneering idea of Galileo, has been used successfully very recently to explain the length control of flagella by a biflagellate green algae. Using the same ToF mechanism, here we develop a stochastic model for the dynamics of flagella in two different types of monoflagellate unicellular organisms. A unique feature of these monoflagellates is that these become transiently multi-flagellated during a short span of their life time. The mean length of the flagella in our model reproduce the trend of their temporal variation observed in experiments. Moreover, for probing the intracellular molecular communication between the dynamic flagella of a given cell, we have computed the correlation in the fluctuations of their lengths during the multiflagellated stage of the cell cycle by Monte Carlo simulation.
description: Accepted for Publication in "Physica A: Statistical Mechanics and its Applications"
Magnetic relaxation measurements of exchange biased (Pt/Co) multilayers with perpendicular anisotropy
Creators: name: Romanens, Fabien
name: Pizzini, Stefania
name: Sort, Jordi
name: Garcia, Flavio
name: Camarero, Julio
name: Yokaichiya, Fabiano
name: Pennec, Yan
name: Vogel, Jan
name: Dieny, Bernard
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Magnetic relaxation measurements were carried out by magneto-optical Kerr effect on exchange biased (Pt/Co)5/Pt/FeMn multilayers with perpendicular anisotropy. In these films the coercivity and the exchange bias field vary with Pt spacer thickness, and have a maximum for 0.2 nm. Hysteresis loops do not reveal important differences between the reversal for ascending and descending fields. Relaxation measurements were fitted using Fatuzzo's model, which assumes that reversal occurs by domain nucleation and domain wall propagation. For 2 nm thick Pt spacer (no exchange bias) the reversal is dominated by domain wall propagation starting from a few nucleation centers. For 0.2 nm Pt spacer (maximum exchange bias) the reversal is strongly dominated by nucleation, and no differences between the behaviour of the ascending and descending branches can be observed. For 0.4 nm Pt spacer (weaker exchange bias) the nucleation density becomes less important, and the measurements reveal a much stronger density of nucleation centers in the descending branch.
description: Europhysical Journal B, in print DOI: 10.1140/epjb/e2005-00053-3
An Accounting Tradeoff Between WRP and Government Payments
Creators: name: Ibendahl, Gregory A.
name: Ibendahl, Gregory A.
Publisher: name: Unknown
Year: 2008
Subjects: Land Economics/Use
Public Economics

description: The Wetlands Reserve Program (WRP) can provide farmers financial compensation in exchange for retiring marginal lands from standard agricultural practices. Often overlooked in the analysis is the cost to the government to implement these programs. This paper examines two issues: first do farmers benefit from WRP enrollment and second does the government say money with WRP enrollment. With WRP the government no longer has to pay yearly direct, counter-cyclical, LDP, or crop insurance payments. Results from three Mississippi counties show that for certain crops that have historically paid a lot in government payments, WRP can be cheaper for the government. For farmers, the decision likely depends upon other revenue sources that can take the place of lost crop production.
Nonparametric Efficiency Analysis for Coffee Farms in Puerto Rico
Creators: name: Gregory, Alexandra
name: Featherstone, Allen M.
name: Gregory, Alexandra
name: Featherstone, Allen M.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Crop Production/Industries
subject: Research Methods/ Statistical Methods
subject: coffee production
subject: nonparametric efficiency

description: Coffee production in Puerto Rico is labor intensive since harvest is done by hand for quality and topography conditions. Färe's nonparametric approach was used to estimate technical, allocative, scale and overall efficiency measures for coffee farms in Puerto Rico during the 2000 to 2004 period. On average Puerto Rico coffee farms were 46% technically efficient, 79% scale efficient, and 74% allocatively efficient.
title: Dynamical properties across different coarse-grained models for ionic liquids
Creators: name: Rudzinski, Joseph F.
name: Kloth, Sebastian
name: Wörner, Svenja
name: Pal, Tamisra
name: Kremer, Kurt
name: Bereau, Tristan
name: Vogel, Michael
Publisher: name: IOP Publishing
Year: 2024

description: Room-temperature ionic liquids (RTILs) stand out among molecular liquids for their rich physicochemical characteristics, including structural and dynamic heterogeneity. The significance of electrostatic interactions in RTILs results in long characteristic length- and timescales, and has motivated the development of a number of coarse-grained (CG) simulation models. In this study, we aim to better understand the connection between certain CG parameterization strategies and the dynamical properties and transferability of the resulting models. We systematically compare five CG models: a model largely parameterized from experimental thermodynamic observables; a refinement of this model to increase its structural accuracy; and three models that reproduce a given set of structural distribution functions by construction, with varying intramolecular parameterizations and reference temperatures. All five CG models display limited structural transferability over temperature, and also result in various effective dynamical speedup factors, relative to a reference atomistic model. On the other hand, the structure-based CG models tend to result in more consistent cation–anion relative diffusion than the thermodynamic-based models, for a single thermodynamic state point. By linking short- and long-timescale dynamical behaviors, we demonstrate that the varying dynamical properties of the different CG models can be largely collapsed onto a single curve, which provides evidence for a route to constructing dynamically-consistent CG models of RTILs.
Photoemission signature of momentum-dependent hybridization in CeCoIn$_5$
Creators: name: Kurleto, R.
name: Fidrysiak, M.
name: Nicolaï, L.
name: Minár, J.
name: Rosmus, M.
name: Walczak, Ł.
name: Tejeda, A.
name: Rault, J. E.
name: Bertran, F.
name: Kądzielawa, A. P.
name: Legut, D.
name: Gnida, D.
name: Kaczorowski, D.
name: Kissner, K.
name: Reinert, F.
name: Spałek, J.
name: Starowicz, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Hybridization between $f$ electrons and conduction bands ($c$-$f$ hybridization) is a driving force for many unusual phenomena. To provide insight into it, systematic studies of CeCoIn$_5$ heavy fermion superconductor have been performed by angle-resolved photoemission spectroscopy (ARPES) in a large angular range at temperature of $T=6$ K. The used photon energy of 122 eV corresponds to Ce $4d$-$4f$ resonance. Calculations carried out with relativistic multiple scattering Korringa-Kohn-Rostoker method and one-step model of photoemission yielded realistic simulation of the ARPES spectra indicating that Ce-In surface termination prevails. Surface states, which have been identified in the calculations, contribute significantly to the spectra. Effects of the hybridization strongly depend on wave vector. They include a dispersion of heavy electrons and bands gaining $f$-electron character when approaching Fermi energy. We have also observed a considerable variation of $f$-electron spectral weight at $E_F$, which is normally determined by both matrix element effects and wave vector dependent $c$-$f$ hybridization. Fermi surface scans covering a few Brillouin zones revealed large matrix element effects. A symmetrization of experimental Fermi surface, which reduces matrix element contribution, yielded a specific variation of $4f$-electron enhanced spectral intensity at $E_F$ around $\barΓ$ and $\bar{M}$ points. Tight-binding approximation calculations for Ce-In plane provided the same universal distribution of $4f$-electron density for a range of values of the parameters used in the model.
description: 15 pages, 9 figures
Accurate Correlation Energy Functional for Uniform Electron Gas from an Interpolation Ansatz without Fitting Parameters
Creators: name: Xie, Qing-Xing
name: Wu, Jiashun
name: Zhao, Yan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report an analytical representation of the correlation energy ec(rs, zeta) for a uniform electron gas (UEG), where rs is the Seitz radius or density parameter and zeta is the relative spin polarization. The new functional, called W20, is constructed to capture the known high-density and low-density limit (for zeta = 0 and 1) without any fitting parameters. The comparative assessment against the recent quantum Monte Carlo (QMC) results shows that the performance of the W20 functional is comparable to the popular parametrized UEG correlation functionals. On average, W20 agrees with QMC and PW92 [Phys. Rev. B 45, 13244 (1992)] within 0.01 eV, and W20 recovers the correct high- and low-density limits, whereas the QMC-data fitted UEG correlation functionals do not.
description: 15 pages, 2 figures, 5 tables
Valuation of Temp-Time's Fresh-Check® Indicator on Perishable Food Products in Belgium
Creators: name: Fortin, Corey
name: Goodwin, Harold L.
name: Fortin, Corey
name: Goodwin, Harold L.
Publisher: name: Unknown
Year: 2008
Subjects: Food Consumption/Nutrition/Food Safety

description: Consumers are becoming acutely attentive to the factors that influence food safety and food wholesomeness. The food industry is well regulated, yet there is still illness that results from contaminated fresh food products. Recent food contamination outbreaks and concerns with how food is grown have created an almost hypersensitive food consumer. The TempTime Corporation is a leading international manufacturer in time-temperature sensitive indicators for fresh food products. This company's aim is to provide consumers with more information about exactly what happens to their product from the initial packaging of the product to the time of consumption. Their product, called Fresh-Check®, is about the size of a postage stamp, and is affixed to the outer packaging of fresh food products. It is used in conjunction with the use-by-date to ensure a safe and fresh product. This paper focuses on consumer perceptions of the Fresh-Check indicator in Belgium. We employed the contingent valuation survey method to capture Belgian consumer's overall perception, willingness to pay, preference, and acceptance for Temp-Time's Fresh-Check® indicator on fresh food products.
On the role of heavy flavor parton distributions at high energy colliders
Creators: name: Glück, M.
name: Jimenez-Delgado, P.
name: Reya, E.
name: Schuck, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compare `fixed flavor number scheme' (FFNS) and `variable flavor number scheme' (VFNS) parton model predictions at high energy colliders. Based on our recent LO- and NLO-FFNS dynamical parton distributions, we generate radiatively two sets of VFNS parton distributions where also the heavy quark flavors h=c,b,t are considered as massless partons within the nucleon. By studying the role of these distributions in the production of heavy particles (h\bar{h}, t\bar{b}, hW^{+-}, Higgs--bosons, etc.) at high energy ep, p\bar{p} and pp colliders, we show that the VFNS predictions are compatible with the FFNS ones (to within about 10-20% at LHC, depending on the process) when the invariant mass of the produced system far exceeds the mass of the participating heavy quark flavor.
description: 10 pages, 1 table, 5 figures
Precise Dynamical Masses and Orbital Fits for $β$ Pic b and $β$ Pic c
Creators: name: Brandt, G. Mirek
name: Brandt, Timothy D.
name: Dupuy, Trent J.
name: Li, Yiting
name: Michalik, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a comprehensive orbital analysis to the exoplanets $β$ Pictoris b and c that resolves previously reported tensions between the dynamical and evolutionary mass constraints on $β$ Pic b. We use the MCMC orbit code orvara to fit fifteen years of radial velocities and relative astrometry (including recent GRAVITY measurements), absolute astrometry from Hipparcos and Gaia, and a single relative radial velocity measurement between $β$ Pic A and b. We measure model-independent masses of $9.3^{+2.6}_{-2.5}\, M_{\rm Jup}$ for $β$ Pic b and $8.3\pm 1.0\,M_{\rm Jup}$ for $β$ Pic c. These masses are robust to modest changes to the input data selection. We find a well-constrained eccentricity of $0.119 \pm 0.008$ for $β$ Pic b, and an eccentricity of $0.21^{+0.16}_{-0.09}$ for $β$ Pic c, with the two orbital planes aligned to within $\sim$0.5$^\circ$. Both planets' masses are within $\sim$1$σ$ of the predictions of hot-start evolutionary models and exclude cold starts. We validate our approach on $N$-body synthetic data integrated using REBOUND. We show that orvara can account for three-body effects in the $β$ Pic system down to a level $\sim$5 times smaller than the GRAVITY uncertainties. Systematics in the masses and orbital parameters from orvara's approximate treatment of multiplanet orbits are a factor of $\sim$5 smaller than the uncertainties we derive here. Future GRAVITY observations will improve the constraints on $β$ Pic c's mass and (especially) eccentricity, but improved constraints on the mass of $β$ Pic b will likely require years of additional RV monitoring and improved precision from future Gaia data releases.
description: Published in AJ. 16 pages, 10 figures. Fix to mismatch of columns in predicted positions
Simulating adiabatic evolution of gapped spin systems
Creators: name: Osborne, Tobias J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that adiabatic evolution of a low-dimensional lattice of quantum spins with a spectral gap can be simulated efficiently. In particular, we show that as long as the spectral gap ΔE between the ground state and the first excited state is any constant independent of n, the total number of spins, then the ground-state expectation values of local operators, such as correlation functions, can be computed using polynomial space and time resources. Our results also imply that the local ground-state properties of any two spin models in the same quantum phase can be efficiently obtained from each other. A consequence of these results is that adiabatic quantum algorithms can be simulated efficiently if the spectral gap doesn't scale with n. The simulation method we describe takes place in the Heisenberg picture and does not make use of the finitely correlated state/matrix product state formalism.
description: 13 pages, 2 figures, minor changes
Can one predict DNA Transcription Start Sites by studying bubbles?
Creators: name: van Erp, Titus S.
name: Cuesta-Lopez, Santiago
name: Hagmann, Johannes-Geert
name: Peyrard, Michel
Publisher: name: arXiv
Year: 2005
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: It has been speculated that bubble formation of several base-pairs due to thermal fluctuations is indicatory for biological active sites. Recent evidence, based on experiments and molecular dynamics (MD) simulations using the Peyrard-Bishop-Dauxois model, seems to point in this direction. However, sufficiently large bubbles appear only seldom which makes an accurate calculation difficult even for minimal models. In this letter, we introduce a new method that is orders of magnitude faster than MD. Using this method we show that the present evidence is unsubstantiated.
description: 4 pages, 3 figures, accepted for publication in physical review letters
The $\epem\toπ^+π^-π^+π^-$, $K^+K^-π^+π^-$, and $K^+K^- K^+K^- $ Cross Sections at Center-of-Mass Energies 0.5--4.5 \gev Measured with Initial-State Radiation
Creators: name: Aubert, B.
name: Collaboration, BABAR
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We study the process $e^+e^-\toπ^+π^-π^+π^-γ$, with a hard photon radiated from the initial state. About 60,000 fully reconstructed events have been selected from 89 $fb^{-1}$ of BaBar data. The invariant mass of the hadronic final state defines the effective \epem center-of-mass energy, so that these data can be compared with the corresponding direct $e^+e^-$ measurements. From the $4π$-mass spectrum, the cross section for the process $e^+e^-\toπ^+π^-π^+π^-$ is measured for center-of-mass energies from 0.6 to 4.5 $GeV/c^2$. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states $K^+ K^- π^+π^-$ and $K^+ K^- K^+ K^-$. We observe the $J/ψ$ in all three final states and measure the corresponding branching fractions. We search for X(3872) in $J/ψ(\toμ^+μ^-) π^+π^-$ and obtain an upper limit on the product of the $e^+e^-$ width of the X(3872) and the branching fraction for $X(3872) \to J/ψπ^+π^-$.
description: 25 pages, 30 figures
Thermoelectric properties of the layered Pd oxide R_2PdO_4 (R = La, Nd, Sm and Gd)
Creators: name: Shibasaki, S.
name: Terasaki, I.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We prepared polycrystalline samples of R$_2$PdO$_4$ (R = La, Nd, Sm and Gd) using a NaCl-flux technique. The measured resistivity is of the order of 10$^3-10^4$ $Ω$cm at room temperature, which is two orders of magnitude smaller than the values reported so far. We further studied the substitution effects of Ce for Nd in Nd$_{1.9}$Ce$_{0.1}$PdO$_4$, where the substituted Ce decreases the resistivity and the magnitude of the thermopower. The activation energy gap of 70-80 meV and the effective mass of 15 evaluated from the measured data are suitable for thermoelectric materials, but the mobility of 10$^{-6}$ cm$^2$/Vs is much lower than a typical value of 1-10 cm$^2$/Vs for other thermoelectric oxides.
description: 5 pages, 5 figures, to appear in J. Phys. Soc. Jpn
A method for sharing dynamic geometry information in studies on liquid-based detectors
Creators: name: Zhang, Shu
name: Li, Jing-Shu
name: Su, Yang-Jie
name: Zhang, Yu-Mei
name: Li, Zi-Yuan
name: You, Zheng-Yun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The liquid-based detectors are widely used in particle and nuclear physics experiments. Due to the fixed way of constructing geometry in detector simulation such as Geant4, it is usually difficult to describe the non-uniformity of liquid in detectors. We propose a method based on GDML and tessellated detector description to share the detector geometry information between Computational Fluid Dynamics (CFD) simulation software and detector simulation software. The method makes it possible to study the impact of liquid flow and non-uniformity on some key performance of the liquid-based detectors, such as event vertex reconstruction resolution. It will also be helpful in detector design and performance optimization.
description: 10 pages, 18 figures
Concurrence vs. purity: Influence of local channels on Bell states of two qubits
Creators: name: Ziman, Mario
name: Buzek, Vladimir
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze how a maximally entangled state of two-qubits (e.g., the singlet $ψ_s$) is affected by action of local channels described by completely positive maps $\cE$ . We analyze the concurrence and the purity of states $\varrho_\cE=\cE\otimes\cI[ψ_s]$.Using the concurrence-{\it vs}-purity phase diagram we characterize local channels $\cE$ by their action on the singlet state $ψ_s$. We specify a region of the concurrence-{\it vs.}-purity diagram that is achievable from the singlet state via the action of unital channels. We show that even most general (including non-unital) local channels acting just on a single qubit of the original singlet state cannot generate the maximally entangled mixed states (MEMS). We study in detail various time evolutions of the original singlet state induced by local Markovian semigroups. We show that the decoherence process is represented in the concurrence-{\it vs.}-purity diagram by a line that forms the lower bound of the achievable region for unital maps. On the other hand, the depolarization process is represented by a line that forms the upper bound of the region of maps induced by unital maps.
description: 9 pages, 6 figures
The Farm Level Economic Impacts of Increased Cash Lease Rates
Creators: name: Raulston, J. Marc
name: Knapek, George M.
name: Richardson, James W.
name: Outlaw, Joe L.
name: Anderson, David P.
name: Raulston, J. Marc
name: Knapek, George M.
name: Richardson, James W.
name: Outlaw, Joe L.
name: Anderson, David P.
Publisher: name: Unknown
Year: 2008
Subjects: Farm Management
Land Economics/Use

description: Higher commodity price expectations have led to increases in cash lease rates nationwide. This study evaluates the farm level impacts of higher cash lease rates. Current levels of cash rents along with land tenure arrangements of specific farms are instrumental in determining the impacts of increases in lease rates.
Comparison between models of insulator and semiconductor thin films islanding
Creators: name: Lallet, F.
name: Dauger, A.
name: Olivi-Tran, N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The synthesis of self-organized quantum dots (QD's) can be achieved through bottom up layer by layer deposition processes as chemical vapor deposition (CVD) or physical vapor deposition (PVD). However, QD's may also be synthesized via sol-gel route, which involves a spontaneous evolution from thin films to discrete QD's without further deposition. The aim of the paper is to discuss and compare the physical phenomena involved in QD's formation which initiate from thin film surface roughening between PVD-CVD and sol-gel synthesis approaches. We propose two simple physical models which are relevant to explain the fundamental differences between those methods.
description: 5 pages, 2 figures, published in physica status solidi (c)
title: Enhanced anomalous Nernst effects in ferromagnetic materials driven by Weyl nodes
Creators: name: Samathrakis, Ilias
name: Long, Teng
name: Zhang, Zeying
name: Singh, Harish K.
name: Zhang, Hongbin
Publisher: name: IOP Publishing
Year: 2024

description: Based on high-throughput (HTP) first-principles calculations, we evaluated the anomalous Hall and anomalous Nernst conductivities of 266 transition-metal-based ferromagnetic compounds. Detailed analysis based on the symmetries and Berry curvatures reveals that the origin of singular-like behavior of anomalous Hall/Nernst conductivities can be mostly attributed to the appearance of Weyl nodes or nodal lines located in the proximity of the Fermi energy, which can be further tailored by external stimuli such as biaxial strains and magnetic fields. Moreover, such calculations are enabled by the automated construction of Wannier functions with a success rate of 92%, which paves the way to perform accurate HTP evaluation of the physical properties such as the transport properties using the Wannier interpolation.
Optimal Seasonal Allocation of Generic Dairy Advertising Expenditures
Creators: name: Schmit, Todd M.
name: Kaiser, Harry M.
name: Schmit, Todd M.
name: Kaiser, Harry M.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: dairy
subject: generic advertising
subject: optimal seasonal allocation

description: Annual seasonal advertising expenditure allocations were estimated for the national generic advertising programs for fluid milk and cheese with the use of price and advertising elasticities of demand that varied over time. Significant variation in optimal allocations existed both across products and over time, emphasizing the importance of obtaining accurate seasonal forecasts that incorporate changes in market conditions to plan future spending allocations. In the absence of such information, allocating annual budgets equally across quarters still produced positive producer welfare gains on average relative to historical spending that were not statistically different from those realized under the optimal spending strategy.
High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber
Creators: name: Hübel, Hannes
name: Vanner, Michael R.
name: Lederer, Thomas
name: Blauensteiner, Bibiane
name: Lorünser, Thomas
name: Poppe, Andreas
name: Zeilinger, Anton
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate non-degenerate down-conversion at 810 and 1550 nm for long-distance fiber based quantum communication using polarization entangled photon pairs. Measurements of the two-photon visibility, without dark count subtraction, have shown that the quantum correlations (raw visibility 89%) allow secure quantum cryptography after 100 km of non-zero dispersion shifted fiber using commercially available single photon detectors. In addition, quantum state tomography has revealed little degradation of state negativity, decreasing from 0.99 at the source to 0.93 after 100 km, indicating minimal loss in fidelity during the transmission.
description: 7 pages, 4 figures
Trust and Contracting in Agri-Food Hybrid Structures
Creators: name: Martino, Gaetano
name: Martino, Gaetano
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agribusiness
subject: hybrid structures
subject: trust
subject: contract

description: The paper aims at examining the hypothesis that the influence of trust on contract can be thought of as a dynamic factor of organizational choices in supply chains. The relationship between contract and trust is delineated on the basis of institutional environment, contractual incompleteness, safeguards and restrictive provisions. The interaction between individual and system elements in the formation of trust and its influence in hybrid contracting is considered. According to a New Institutional Economics approach and a theoretical framework is proposed. Empirical evidence is provided by a case study regarding an Italian retailer company establishing hybrid structure with its suppliers. Investments in suppliers selection provide the basis for trust supporting relationships which economize on negotiating and litigation costs.
About the screening of the charge of a proton migrating in a metal
Creators: name: Lodder, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The amount of screening of a proton in a metal, migrating under the influence of an applied electric field, is calculated using different theoretical formulations. First the lowest order screening expression derived by Sham (1975) is evaluated. In addition 'exact' expressions are evaluated which were derived according to different approaches. For a proton in a metal modeled as a jellium the screening appears to be 15 +/- 10 %, which is neither negligible not reconcilable with the controversial full-screening point of view of Bosvieux and Friedel (1962). In reconsidering the theory of electromigration, a new simplified linear-response expression for the driving force is shown to lead to essentially the same result as found by Sorbello (1985), who has used a rather complicated technique. The expressions allow for a reduction such that only the scattering phase shifts of the migrating impurity are required. Finally it is shown that the starting formula for the driving force of Bosvieux and Friedel leads exactly to the zero-temperature limit of well-established linear response descriptions, by which the sting of the controversy has been removed.
description: 14 pages, 5 figures
Some Distributional Issues in Greenhouse Gas Policy Design
Creators: name: Freebairn, John W.
name: Freebairn, John W.
Publisher: name: Unknown
Year: 2008
Subjects: Environmental Economics and Policy

description: The paper argues from first principles and with supporting related empirical evidence that most of the final incidence of emissions taxes or tradable permits will fall on consumers of greenhouse gas intensive products. This distributional outcome supports an emissions reduction strategy of an emissions tax or auctioning the tradable permits, rather than gifting permits in a grandfather arrangement to current polluters as was done in Europe and has currency with proposals for Australia. Greenhouse gas emissions and climate change is a global pollution problem that gives rise to a prisoner’s dilemma problem in which the global cooperative solution in undermined by individual countries free-riding. Some of the issues and challenges to be overcome to reach a cooperative global policy package are discussed, including the different interests and perspectives of developed and developing countries.
Summation test for gap penalties and strong law of the local alignment score
Creators: name: Chan, Hock Peng
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F10, 60F15 (Primary) 92D20. (Secondary)

description: A summation test is proposed to determine admissible types of gap penalties for logarithmic growth of the local alignment score. We also define a converging sequence of log moment generating functions that provide the constants associated with the large deviation rate and logarithmic strong law of the local alignment score and the asymptotic number of matches in the optimal local alignment.
description: Published at http://dx.doi.org/10.1214/105051605000000061 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Modelling and predicting the effect of social distancing and travel restrictions on COVID-19 spreading
Creators: name: Parino, Francesco
name: Zino, Lorenzo
name: Porfiri, Maurizio
name: Rizzo, Alessandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Dynamical Systems (math.DS)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: To date, the only effective means to respond to the spreading of COVID-19 pandemic are non-pharmaceutical interventions (NPIs), which entail policies to reduce social activity and mobility restrictions. Quantifying their effect is difficult, but it is key to reduce their social and economical consequences. Here, we introduce a meta-population model based on temporal networks, calibrated on the COVID-19 outbreak data in Italy and apt to evaluate the outcomes of these two types of NPIs. Our approach combines the advantages of granular spatial modelling of meta-population models with the ability to realistically describe social contacts via activity-driven networks. We provide a valuable framework to assess the viability of different NPIs, varying with respect to their timing and severity. Results suggest that the effects of mobility restrictions largely depend on the possibility to implement timely NPIs in the early phases of the outbreak, whereas activity reduction policies should be prioritised afterwards.
description: 45 Pages (including 18 pages of Supplementary Information); Under review