cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ETEAPOT: symplectic orbit/spin tracking code for all-electric storage rings
Creators: name: Talman, Richard M.
name: Talman, John D.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Proposed methods for measuring the electric dipole moment (EDM) of the proton use an intense, polarized proton beam stored in an all-electric storage ring "trap". At the "magic" kinetic energy of 232.792 MeV, proton spins are "frozen", for example always parallel to the instantaneous particle momentum. This paper describes an accelerator simulation code, ETEAPOT, a new component of the Unified Accelerator Libraries (UAL), to be used for long term tracking of particle orbits and spins in electric bend accelerators, in order to simulate EDM storage ring experiments. Though qualitatively much like magnetic rings, the non-constant particle velocity in electric rings give them significantly different properties, especially in weak focusing rings. Like the earlier code TEAPOT (for magnetic ring simulation) this code performs \emph{exact tracking in an idealized (approximate) lattice} rather than the more conventional approach, which is \emph{approximate tracking in a more nearly exact lattice.} The BMT equation describing the evolution of spin vectors through idealized bend elements is also solved exactly---original to this paper. Furthermore the idealization permits the code to be exactly symplectic (with no artificial "symplectification"). Any residual spurious damping or anti-damping is sufficiently small to permit reliable tracking for the long times, such as the 1000 seconds assumed in estimating the achievable EDM precision.
description: 22 pages, 3 figures. There is a closely related paper by the same authors: "EDM planning using ETEAPOT with a resurrected AGS Electron Analogue ring"
Uniform Correlation Mixture of Bivariate Normal Distributions and Hypercubically Contoured Densities That Are Marginally Normal
Creators: name: Brown, Lawrence
name: Zhao, Linda
name: Zhang, Kai
name: George, Edward
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: The bivariate normal density with unit variance and correlation ρ is well-known. We show that by integrating out ρ, the result is a function of the maximum norm. The Bayesian interpretation of this result is that if we put a uniform prior over ρ, then the marginal bivariate density depends only on the maximal magnitude of the variables. The square-shaped isodensity contour of this resulting marginal bivariate density can also be regarded as the equally-weighted mixture of bivariate normal distributions over all possible correlation coefficients. This density links to the Khintchine mixture method of generating random variables. We use this method to construct the higher dimensional generalizations of this distribution. We further show that for each dimension, there is a unique multivariate density that is a differentiable function of the maximum norm and is marginally normal, and the bivariate density from the integral over ρ is its special case in two dimensions.
Deconvolution with supersmooth distributions
Creators: name: Fan, Jianqing
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1992

description: The desire to recover the unknown density when data are contaminated with errors leads to nonparametric deconvolution problems. Optimal global rates of convergence are found under the weighted Lp-loss (1 ≤ p ≤ ∞). It appears that the optimal rates of convergence are extremely slow for supersmooth error distributions. To overcome the difficulty, we examine how large the noise level can be for deconvolution to be feasible, and for the deconvolution estimate to be as good as the ordinary density estimate. It is shown that if noise level is not too large, nonparametric Gaussian deconvolution can still be practical. Several simulation studies are also presented.
(102311) Agnes Clarabell Gwenfwyn James
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Consequences of the center–of–mass correction in nuclear mean–field models
Creators: name: Rutz, K.
name: Bender, M.
name: Maruhn, J.A.
name: Reinhard, P.-G.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2000

description: We study the influence of the scheme for the correction for spurious center–of–mass motion on the fit of effective interactions for self–consistent nuclear mean–field calculations. We find that interactions with very simple center-of-mass correction have significantly larger surface coefficients than interactions for which the center–of–mass correction was calculated for the actual many–body state during the fit. The reason for that is that the effective interaction has to counteract the wrong trends with nucleon number of all simplified schemes for center–of–mass correction which puts a wrong trend with mass number into the effective interaction itself. The effect becomes clearly visible when looking at the deformation energy of largely deformed systems, e.g. superdeformed states or fission barriers of heavy nuclei.
The crucial role of surface magnetic fields for the solar dynamo
Creators: name: Cameron, Robert
name: Schüssler, Manfred
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Sunspots and the plethora of other phenomena occuring in the course of the 11-year cycle of solar activity are a consequence of the emergence of magnetic flux at the solar surface. The observed orientations of bipolar sunspot groups imply that they originate from toroidal (azimuthally orientated) magnetic flux in the convective envelope of the Sun. We show that the net toroidal magnetic flux generated by differential rotation within a hemisphere of the convection zone is determined by the emerged magnetic flux at the solar surface and thus can be calculated from the observed magnetic field distribution. The main source of the toroidal flux is the roughly dipolar surface magnetic field at the polar caps, which peaks around the minima of the activity cycle.
description: This manuscript has been accepted for publication in Science. This version has not undergone final editing. Please refer to the complete version of record at http://www.sciencemag.org/. The manuscript may not be reproduced or used in any manner that does not fall within the fair use provisions of the Copyright Act without the prior, written permission of AAAS
(102309) William Thomas
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Active Authentication on Mobile Devices via Stylometry, Application Usage, Web Browsing, and GPS Location
Creators: name: Fridman, Lex
name: Weber, Steven
name: Greenstadt, Rachel
name: Kam, Moshe
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Active authentication is the problem of continuously verifying the identity of a person based on behavioral aspects of their interaction with a computing device. In this study, we collect and analyze behavioral biometrics data from 200subjects, each using their personal Android mobile device for a period of at least 30 days. This dataset is novel in the context of active authentication due to its size, duration, number of modalities, and absence of restrictions on tracked activity. The geographical colocation of the subjects in the study is representative of a large closed-world environment such as an organization where the unauthorized user of a device is likely to be an insider threat: coming from within the organization. We consider four biometric modalities: (1) text entered via soft keyboard, (2) applications used, (3) websites visited, and (4) physical location of the device as determined from GPS (when outdoors) or WiFi (when indoors). We implement and test a classifier for each modality and organize the classifiers as a parallel binary decision fusion architecture. We are able to characterize the performance of the system with respect to intruder detection time and to quantify the contribution of each modality to the overall performance.
description: Accepted for Publication in the IEEE Systems Journal
Tighter monogamy relations of entanglement measures based on fidelity
Creators: name: Zhang, Meiming
name: Jing, Naihuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the Bures measure of entanglement and the geometric measure of entanglement as special cases of entanglement measures based on fidelity, and find their tighter monogamy inequalities over tri-qubit systems as well as multi-qubit systems. Furthermore, we derive the monogamy inequality of concurrence for qudit quantum systems by projecting higher-dimensional states to qubit substates.
description: 17pp
Pairing gaps from nuclear mean-field models
Creators: name: Rutz, K.
name: Reinhard, P.-G.
name: Maruhn, J.A.
name: Bender, M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2000

description: We discuss the pairing gap, a measure for nuclear pairing correlations, in chains of spherical, semi–magic nuclei in the framework of self–consistent nuclear mean–field models. The equations for the conventional BCS model and the approximate projection–before–variation Lipkin–Nogami method are formulated in terms of local density functionals for the effective interaction. We calculate the Lipkin–Nogami corrections of both the mean–field energy and the pairing energy. Various definitions of the pairing gap are discussed as three–point, four–point and five–point mass–difference formulae, averaged matrix elements of the pairing potential, and single–quasiparticle energies. Experimental values for the pairing gap are compared with calculations employing both a delta pairing force and a density–dependent delta interaction in the BCS and Lipkin–Nogami model. Odd–mass nuclei are calculated in the spherical blocking approximation which neglects part of the the core polarization in the odd nucleus. We find that the five–point mass difference formula gives a very robust description of the odd–even staggering, other approximations for the gap may differ from that up to 30% for certain nuclei.
Smale Strategies for Network Prisoner's Dilemma Games
Creators: name: Behrstock, Kashi
name: Benaïm, Michel
name: Hirsch, Morris W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 91A06, 91A26, 62L20, 34G25, 37B25

description: Smale's approach \cite{Smale80} to the classical two-players repeated Prisoner's Dilemma game is revisited here for $N$-players and Network games in the framework of Blackwell's approachability, stochastic approximations and differential inclusions.
(102310) Sarah [Thomas]
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Using Consensual Biterms from Text Structures of Requirements and Code to Improve IR-Based Traceability Recovery
Creators: name: Gao, Hui
name: Kuang, Hongyu
name: Sun, Kexin
name: Ma, Xiaoxing
name: Egyed, Alexander
name: Mäder, Patrick
name: Rong, Guoping
name: Shao, Dong
name: Zhang, He
Publisher: name: arXiv
Year: 2022
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Traceability approves trace links among software artifacts based on whether two artifacts are related by system functionalities. The traces are valuable for software development, but are difficult to obtain manually. To cope with the costly and fallible manual recovery, automated approaches are proposed to recover traces through textual similarities among software artifacts, such as those based on Information Retrieval (IR). However, the low quality & quantity of artifact texts negatively impact the calculated IR values, thus greatly hindering the performance of IR-based approaches. In this study, we propose to extract co-occurred word pairs from the text structures of both requirements and code (i.e., consensual biterms) to improve IR-based traceability recovery. We first collect a set of biterms based on the part-of-speech of requirement texts, and then filter them through the code texts. We then use these consensual biterms to both enrich the input corpus for IR techniques and enhance the calculations of IR values. A nine-system-based evaluation shows that in general, when solely used to enhance IR techniques, our approach can outperform pure IR-based approaches and another baseline by 21.9% & 21.8% in AP, and 9.3% & 7.2% in MAP, respectively. Moreover, when used to collaborate with another enhancing strategy from different perspectives, it can outperform this baseline by 5.9% in AP and 4.8% in MAP.
description: Accepted by the 37th IEEE/ACM International Conference on Automated Software Engineering (ASE 2022)
Nucleon spin-polarisabilities from polarisation observables in low-energy deuteron Compton scattering
Creators: name: Grießhammer, H. W.
name: Shukla, D.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: We investigate the dependence of polarisation observables in elastic deuteron Compton scattering below the pion production threshold on the spin-independent and spin-dependent iso-scalar dipole polarisabilities of the nucleon. The calculation uses Chiral Effective Field Theory with dynamical Δ(1232) degrees of freedom in the Small Scale Expansion at next-to-leading order. Resummation of the NN intermediate rescattering states and including the Δ induces sizeable effects. The analysis considers cross-sections and the analysing power of linearly polarised photons on an unpolarised target, and cross-section differences and asymmetries of linearly and circularly polarised beams on a vector-polarised deuteron. An intuitive argument helps one to identify kinematics in which one or several polarisabilities do not contribute. Some double-polarised observables are only sensitive to linear combinations of two of the spin-polarisabilities, simplifying a multipole-analysis of the data. Spin-polarisabilities can be extracted at photon energies ≥ 100 MeV, after measurements at lower energies of . 70 MeV provide high-accuracy determinations of the spin-independent ones. An interactive Mathematica 7.0 notebook of our findings is available from hgrie@gwu.edu.
Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements
Creators: name: de Lange, G.
name: van Heck, B.
name: Bruno, A.
name: van Woerkom, D. J.
name: Geresdi, A.
name: Plissard, S. R.
name: Bakkers, E. P. A. M.
name: Akhmerov, A. R.
name: DiCarlo, L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the realization of quantum microwave circuits using hybrid superconductor-semiconductor Josephson elements comprised of InAs nanowires contacted by NbTiN. Capacitively-shunted single elements behave as transmon qubits with electrically tunable transition frequencies. Two-element circuits also exhibit transmon-like behavior near zero applied flux, but behave as flux qubits at half the flux quantum, where non-sinusoidal current-phase relations in the elements produce a double-well Josephson potential. These hybrid Josephson elements are promising for applications requiring microwave superconducting circuits operating in magnetic field.
description: Main text: 4 pages, 4 figures; Supplement: 10 pages, 8 figures, 1 table
(102300) Lydia Norah Belk
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Folic acid deficiency induces premature hearing loss through mechanisms involving cochlear oxidative stress and impairment of homocysteine metabolism
Creators: name: Martínez-Álvarez, Concepción
name: Zeisel, Steven
name: Varela-Moreiras, Gregorio
name: Martínez-Vega, Raquel
name: Garrido, Francisco
name: Pajares, María
name: Cediel, Rafael
name: Partearroyo, Teresa
name: Varela-Nieto, Isabel
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: Nutritional imbalance is emerging as a causative factor of hearing loss (HL). Epidemiological studies have linked HL to elevated plasma homocysteine (pHcy) and folate deficiency, and showed that folate supplementation lowers pHcy levels potentially ameliorating age-related HL. The purpose of this study was to address the potential impact of folate deficiency in HL and to unveil the underlying mechanisms. For this purpose, two-month old C57BL/6J-mice (Animalia Chordata Mus musculus) were randomly divided in two groups (n=65 each) that were fed folate-deficient or standard diets for 8 weeks. HPLC analysis demonstrated 7-fold decline in serum folate and 3-fold increase in pHcy levels. Auditory brainstem recordings showed that only folate-deficient mice exhibited severe HL and cochlear TUNEL+-apoptotic cells. RTqPCR and Western-blotting showed reduced levels of enzymes involved in Hcy production and recycling, together with 30% increased protein homocysteinylation. Redox stress was evidenced by decreased expression of Cat, Gpx4 and Gss genes, increased levels of the proteins MnSOD and the NOX-complex adaptor p22phox, and elevated concentrations of glutathione species. Altogether, our findings show for the first time that the relationship between folate-induced hyperhomocysteinemia and premature HL involves impairment of cochlear Hcy metabolism and associated oxidative stress.
Differentially Private State Estimation in Distribution Networks with Smart Meters
Creators: name: Sandberg, Henrik
name: Dán, György
name: Thobaben, Ragnar
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: State estimation is routinely being performed in high-voltage power transmission grids in order to assist in operation and to detect faulty equipment. In low- and medium-voltage power distribution grids, on the other hand, few real-time measurements are traditionally available, and operation is often conducted based on predicted and historical data. Today, in many parts of the world, smart meters have been deployed at many customers, and their measurements could in principle be shared with the operators in real time to enable improved state estimation. However, customers may feel reluctance in doing so due to privacy concerns. We therefore propose state estimation schemes for a distribution grid model, which ensure differential privacy to the customers. In particular, the state estimation schemes optimize different performance criteria, and a trade-off between a lower bound on the estimation performance versus the customers' differential privacy is derived. The proposed framework is general enough to be applicable also to other distribution networks, such as water and gas networks.
(102302) John Thomas Belk
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Removing membrane locking in quadratic NURBS-based discretizations of linear plane Kirchhoff rods: CAS elements
Creators: name: Casquero, Hugo
name: Golestanian, Mahmoud
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: NURBS-based discretizations suffer from membrane locking when applied to primal formulations of curved thin-walled structures. We consider linear plane curved Kirchhoff rods as a model problem to study how to remove membrane locking from NURBS-based discretizations. In this work, we propose continuous-assumed-strain (CAS) elements, an assumed strain treatment that removes membrane locking from quadratic NURBS for an ample range of slenderness ratios. CAS elements take advantage of the C1 inter-element continuity of the displacement vector given by quadratic NURBS to interpolate the membrane strain using linear Lagrange polynomials while preserving the C0 inter-element continuity of the membrane strain. CAS elements are the first NURBS-based element type able to remove membrane locking for a broad range of slenderness ratios that combines the following characteristics: (1) No additional degrees of freedom are added, (2) No additional systems of algebraic equations need to be solved, and (3) The nonzero pattern of the stiffness matrix is preserved. Since the only additional computations required by the proposed element type are to evaluate the derivatives of the basis functions and the unit tangent vector at the knots, the proposed scheme barely increases the computational cost with respect to the locking-prone NURBS-based discretization of the primal formulation. The benchmark problems show that the convergence of CAS elements is independent of the slenderness ratio while the convergence of quadratic NURBS elements, local Bbar elements, and local ANS elements depends heavily on the slenderness ratio. The numerical examples also show how CAS elements remove the spurious oscillations in stress resultants caused by membrane locking while quadratic NURBS elements, local Bbar elements, and local ANS elements suffer from large-amplitude spurious oscillations in stress resultants.
Frequency-Dependent Dispersion Measures and Implications for Pulsar Timing
Creators: name: Cordes, J. M.
name: Shannon, R. M.
name: Stinebring, D. R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyze the frequency dependence of the dispersion measure (DM), the column density of free electrons to a pulsar, caused by multipath scattering from small scale electron-density fluctuations. The DM is slightly different along each propagation path and the transverse spread of paths varies greatly with frequency, yielding time-of-arrival (TOA) perturbations that scale differently than the inverse square of the frequency, the expected dependence for a cold, unmagnetized plasma. We quantify DM and TOA perturbations analytically for thin phase screens and extended media and verify the results with simulations of thin screens. The rms difference between DMs across an octave band near 1.5~GHz $\sim 4\times10^{-5}\,{\rm pc\ cm^{-3}}$ for pulsars at $\sim 1$~kpc distance. TOA errors from chromatic DMs are of order a few to hundreds of nanoseconds for pulsars with DM $\lesssim 30$~pc~cm$^{-3}$ observed across an octave band but increase rapidly to microseconds or larger for larger DMs and wider frequency ranges. Frequency-dependent DMs introduce correlated noise into timing residuals whose power spectrum is `low pass' in form. The correlation time is of order the geometric mean of the refraction times for the highest and lowest radio frequencies used and thus ranges from days to years, depending on the pulsar. We discuss the implications for methodologies that use large frequency separations or wide bandwidth receivers for timing measurements. Chromatic DMs are partially mitigable by using an additional chromatic term in arrival time models. Without mitigation, our results provide an additional term in the noise model for pulsar timing; they also indicate that in combination with measurement errors from radiometer noise, an arbitrary increase in total frequency range (or bandwidth) will yield diminishing benefits and may be detrimental to overall timing precision.
description: 19 pages, 13 figures; submitted to the Astrophysical Journal
(102303) Lydia Septima Stephenson
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
EDM planning using ETEAPOT with a resurrected AGS Electron Analogue ring
Creators: name: Talman, Richard M
name: Talman, John D
Publisher: name: arXiv
Year: 2015
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: There has been much recent interest in directly measuring the electric dipole moments (EDM) of the proton and the electron. Such a measurement will require storing a polarized beam of "frozen spin" particles in an all-electric storage ring. Only one such relativistic electric accelerator has ever been built---the "Electron Analogue" ring at Brookhaven National Laboratory in 1954. By chance this electron ring, long since dismantled, would have been appropriate both for measuring the electron EDM and to serve as an inexpensive prototype for the arguably more promising, but ten times more expensive, proton EDM measurement. Today it is cheaper yet to "resurrect" the Electron Analogue ring by simulating its performance computationally. This is one purpose for the present paper. To set up these calculations has required a kind of "archeological physics" to reconstitute the detailed Electron Analogue lattice design. The new UAL/ETEAPOT code, described in detail in an accompanying paper, has been developed for modeling storage ring performance, including (exact BMT) spin evolution, in electric rings. Illustrating its use, comparing its predictions with the old observations, and describing new expectations concerning spin evolution and code performance, are other goals of the paper. This paper describes the practical application of the ETEAPOT code and provides sample results, with emphasis on emulating lattice optics in the AGS Analogue ring for comparison with the historical maching studies and to predict the electron spin evolution they would have measured. To exhibit the ETEAPOT code performance and confirm its symplecticity, results are also given for 30 million turn proton spin tracking in an all-electric lattice that would be appropriate for a present day measurement of the proton EDM.
description: 16 pages, 9 figures. There is a related accompnying paper by the same authors "ETEAPOT: symplectic orbit/spin tracking code for all-electric storage rings"
Association Between Anterior Nasal and Plasma SARS-CoV-2 RNA Levels and Hospitalization or Death in Nonhospitalized Adults With Mild-to-Moderate COVID-19
Creators: name: Klekotka, Paul
name: ACTIV-2/A5401 Study Team
name: Fischer, William A
name: Li, Jonathan Z
name: Chew, Kara W
name: Javan, Arzhang Cyrus
name: Pinilla, Mauricio
name: Giganti, Mark J
name: Smith, Davey M
name: Currier, Judith S
name: Moser, Carlee
name: Hughes, Michael D
name: Daar, Eric S
name: Coombs, Robert W
name: Wohl, David Alain
name: Margolis, David
name: Eron, Joseph J
Publisher: name: Oxford University Press (OUP)
Year: 2023

description:
BACKGROUND: There is little information regarding severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA as a predictor for clinical outcomes in outpatients with mild-to-moderate coronavirus disease 2019 (COVID-19). METHODS: Anterior nasal (AN) and plasma SARS-CoV-2 RNA data from 2115 nonhospitalized adults who received monoclonal antibodies (mAbs) or placebo in the ACTIV-2/A5401 trial were analyzed for associations with hospitalization or death. RESULTS: One hundred two participants were hospitalized or died through 28 days of follow-up. Higher day 0 (pretreatment) AN RNA was associated with increasing risk of hospitalization/death (risk ratio [RR], 1.24 per log10 copies/mL [95% confidence interval {CI}, 1.04-1.49]) among placebo recipients, ranging from 3% to 16% for <2 to ≥6 log10 copies/mL. Although only 1% had quantifiable levels, there was a similar trend across day 0 plasma RNA categories. Higher day 3 AN RNA was associated with subsequent hospitalization/death among placebo recipients (RR, 1.42 per log10 copies/mL [95% CI, 1.00-2.03]), but not mAb recipients (RR, 1.02 per log10 copies/mL [95% CI, 0.68-1.56]). The proportion of treatment effect (reduction in hospitalizations/deaths after day 3 for mAb vs placebo) explained by day 3 AN RNA was 8%. CONCLUSIONS: SARS-CoV-2 RNA levels are predictive of hospitalization/death in the natural history setting, but AN RNA levels may not be a reliable surrogate marker of mAb treatment effect in COVID-19 trials. Clinical Trials Registration. NCT04518410.
Dual pivot Quicksort
Creators: name: Iliopoulos, Vasileios
name: Penman, David B.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: 68W40, 60F05

description: In this paper, we analyse the dual pivot Quicksort, a variant of the standard Quicksort algorithm, in which two pivots are used for the partitioning of the array. We are solving recurrences of the expected number of key comparisons and exchanges performed by the algorithm, obtaining the exact and asymptotic total average values contributing to its time complexity. Further, we compute the average number of partitioning stages and the variance of the number of key comparisons. In terms of mean values, dual pivot Quicksort does not appear to be faster than ordinary algorithm.
description: Post print of the article "Dual pivot Quicksort" published on 1 August of 2012 in the journal of Discrete Mathematics, Algorithms and Applications
Photo-induced modifications of the substrate-adsorbate interaction in K-loaded porous glass
Creators: name: Marmugi, Luca
name: Mariotti, Emilio
name: Burchianti, Alessia
name: Veronesi, Stefano
name: Moi, Luigi
name: Marinelli, Carmela
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The effects of visible and infrared light on potassium atoms embedded in a nanoporous glass matrix are investigated. Photodesorption by visible light enhances the atomic mobility and causes the formation of metallic nanoparticles. Two different populations of metastable clusters with absorption bands in the near-infrared and infrared are grown as a consequence of illumination. Atoms can move between the two groups through sequences of adsorption/desorption events at the pore surface. Irradiation with infrared light, instead, does not significantly enhance the atomic diffusion inside the pores. However, it induces relevant modifications of the substrate, thus changing its interaction with the assembled clusters. Consequently, infrared light alters the dynamics of the system, affecting also the evolution of non-resonant nanoparticles populations, even after the illumination sequence. These results provide new insights on the photo-induced modifications of the substrate-adsorbate interaction in nano-sized confined systems.
description: 15 pages, 9 figures
(102307) Thomas William Thomas
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Online environment mapping using metric-topological maps
Creators: name: Pollefeys, Marc
name: Frahm, Jan-Michael
name: Lim, Jongwoo
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: The paper proposes a vision based online mapping of large-scale environments. Our approach uses a hybrid representation of a fully metric Euclidean environment map and a topological map. This novel hybrid representation facilitates our scalable online hierarchical bundle adjustment approach. The proposed method achieves scalability by solving the local registration through embedding neighboring keyframes and landmarks into a Euclidean space. The global adjustment is performed on a segmentation of the keyframes and posed as the iterative optimization of the arrangement of keyframes in each segment and the arrangement of rigidly moving segments. The iterative global adjustment is performed concurrently with the local registration of the keyframes in a local map. Thus the map is always locally metric around the current location, and likely to be globally consistent. Loop closures are handled very efficiently benefiting from the topological nature of the map and overcoming the loss of the metric map properties as previous approaches. The effectiveness of the proposed method is demonstrated in real-time on various challenging video sequences.
title: Rezension: "Macht Arbeit frei?: German Economic Policy and Forced Labor of Jews in the General Government, 1939–1943" / Witold W. Mędykowski. Boston: Academic Studies Press, 2018. ISBN: 9781618115966
Creators: name: Grelka, Frank
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2020

description: Witold Mȩdykowski, ein in Israel und Polen ausgebildeter Historiker und Politologe, ist mutmaßlich einer der besten Kenner der Archive des Genozids an den polnischen Juden. Seit beinahe zwei Jahrzehnten erforscht er als wissenschaftlicher Mitarbeiter von Yad Vashem in Jerusalem die Primärquellen zum Schicksal von rund 3 Millionen polnischen Juden, von denen nur etwa zehn Prozent die Verfolgung und die Vernichtung durch die deutsche Besatzungsverwaltung überlebten. Das vorliegende Buch kann als „Opus magnum Mȩdykowski" bezeichnet werden, da es die Ergebnisse seiner minutiösen Archivrecherchen zusammenfasst und Generationen von Historikern des Holocaust ein wichtiges Nachschlagewerk sein wird.
A MARKET WITH A SOCIAL CONSUMPTION EXTERNALITY
Creators: name: FRIEDMAN, JAMES
name: GRILO, ISABEL
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2005

description: We model a spatial market in which the utility of each consumer is affected by the collection of consumers who buy precisely the same product. The marginal contribution of another consumer x’s purchase on consumer y depends on |y - x|. This marginal contribution declines as |y - x| increases and can be negative. This way of modeling preferences fits goods that signal something about a consumer’s place in society; clothing styles, automobiles, and jewellry are examples. For a given number of firms and a given overall market size, we find the unique symmetric equilibrium and also derive comparative statics results on the optimal number of firms, the largest number of firms the market can support and the behavior of profits per firm as the number of firms increases.
Angular distributions in $t{\bar t}H (H\rightarrow b\bar{b})$ reconstructed events at the LHC
Creators: name: Santos, S. P. Amor dos
name: Araque, J. P.
name: Cantrill, R.
name: Castro, N. F.
name: Fiolhais, M. C. N.
name: Frederix, R.
name: Gonçalo, R.
name: Martins, R.
name: Santos, R.
name: Silva, J.
name: Onofre, A.
name: Peixoto, H.
name: Reigoto, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The associated production of a Higgs boson and a top-quark pair, $t{\bar t} H$, in proton-proton collisions is addressed in this paper for a center of mass energy of 13TeV at the LHC. Dileptonic final states of $t{\bar t}H$ events with two oppositely charged leptons and four jets from the decays $t\rightarrow bW^+ \rightarrow b \ell^+ν_\ell$, $\bar{t}\rightarrow \bar{b}W^- \rightarrow \bar{b} \ell^-\barν_\ell$ and $h\rightarrow b\bar{b}$, are used. Signal events, generated with MadGraph5_aMC@NLO, are fully reconstructed by applying a kinematic fit. New angular distributions of the decay products as well as angular asymmetries are explored in order to improve discrimination of $t{\bar t} H$ signal events over the dominant irreducible background contribution, $t{\bar t}b{\bar b}$. Even after the full kinematic fit reconstruction of the events, the proposed angular distributions and asymmetries are still quite different in the $t\bar{t}H$ signal and the dominant background ($t\bar{t}b\bar{b}$).
description: 12 pages, 14 figures
(102297) Jane Jones
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Geometric expansion of the log-partition function of the anisotropic Heisenberg model
Creators: name: Gandolfo, Daniel
name: Poghosyan, Suren
name: Ruiz, Jean
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the asymptotic expansion of the log-partition function of the anisotropic Heisenberg model in a bounded domain as this domain is dilated to infinity. Using the Ginibre's representation of the anisotropic Heisenberg model as a gas of interacting trajectories of a compound Poisson process we find all the non-decreasing terms of this expansion. They are given explicitly in terms of functional integrals. As the main technical tool we use the cluster expansion method.
description: 38 pages
(102295) Thomas Benjamin Hirst
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Clickenomics: Using a Classroom Response System to Increase Student Engagement in a Large-Enrollment Principles of Economics Course
Creators: name: Salemi, Michael K.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: One of the most important challenges facing college instructors of Economics is helping students engage. Engagement is particularly important in the Principles of Economics course where it can help students achieve a long-lived understanding of how economists use basic economic ideas to look at the world. In this paper, I report on how instructors can use Classroom Response Systems (clickers) to promote engagement in the Principles course. I draw heavily on my own experience in teaching a one semester Principles course at the University of North Carolina at Chapel Hill but also report on how others have used clickers to promote engagement. I conclude with evidence that students find clickers very beneficial and with an assessment of the costs and benefits of adopting a clicker system.
On the Bias of the Distance-Redshift Relation from Gravitational Lensing
Creators: name: Kaiser, Nick
name: Peacock, John A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A long standing question in cosmology is whether gravitational lensing changes the distance-redshift relation $D(z)$ or the mean flux density of sources. Interest in this has been rekindled by recent studies in non-linear relativistic perturbation theory that find biases in both the area of a surface of constant redshift and in the mean distance to this surface, with a fractional bias in both cases on the order of the mean squared convergence $\langle κ^2 \rangle$. Any such area bias could alter CMB cosmology, and the corresponding bias in mean flux density could affect supernova cosmology. Here we show that, in an ensemble averaged sense, the perturbation to the area of a surface of constant redshift is in reality much smaller, being on the order of the cumulative bending angle squared, or roughly a part-in-a-million effect. This validates the arguments of Weinberg (1976) that the mean magnification $μ$ of sources is unity and of Kibble \& Lieu (2005) that the mean direction-averaged inverse magnification is unity. It also validates the conventional treatment of lensing in analysis of CMB anisotropies. But the existence of a scatter in magnification will cause any non-linear function of these conserved quantities to be statistically biased. The distance $D$, for example, is proportional to $μ^{-1/2}$ so lensing will bias $\langle D\rangle$ even if $\langle μ\rangle=1$. The fractional bias in such quantities is generally of order $\langle κ^2 \rangle$, which is orders of magnitude larger than the area perturbation. Claims for large bias in area or flux density of sources appear to have resulted from misinterpretation of such effects: they do not represent a new non-Newtonian effect, nor do they invalidate standard cosmological analyses.
description: 32 pages, 5 figures, submitted to MNRAS