127,499 research outputs found
Allan, Percival B, [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/368189Surname: ALLAN
Given Name(s) or Initials: PERCIVAL B
Military Service Number or Last Known Location: No Service Number
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 48689178235
Item: [2016.0049.00520] "Allan, Percival B, [No Service Number]
Joufrois, roman français du XIIIe siècle, publié avec une introduction, un glossaire et des notes par Walter O. Streng-Renkonen, 1930. (Annales Universitatis Aboensis, Series B, t. XII)
No full textFay Percival B. Joufrois, roman français du XIIIe siècle, publié avec une introduction, un glossaire et des notes par Walter O. Streng-Renkonen, 1930. (Annales Universitatis Aboensis, Series B, t. XII). In: Romania, tome 58 n°229, 1932. pp. 114-120
Joufrois, roman français du XIIIe siècle, publié avec une introduction, un glossaire et des notes par Walter O. Streng-Renkonen, 1930. (Annales Universitatis Aboensis, Series B, t. XII)
No full textFay Percival B. Joufrois, roman français du XIIIe siècle, publié avec une introduction, un glossaire et des notes par Walter O. Streng-Renkonen, 1930. (Annales Universitatis Aboensis, Series B, t. XII). In: Romania, tome 58 n°229, 1932. pp. 114-120
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Hawkins, Percival B., 1817-1893 (SC 1481)
No full textFinding aid and scan (Click on Additional Files below) for Manuscripts Small Collection 1481. Receipt, 1860, for tuition paid by Joseph D. Duncan for his two daughters (Drucilla A. Duncan and Eliza Cornelia Duncan) to attend school at Percival B. Hawkins\u27s school in Bowling Green, Kentucky
Interpreting large-scale redshift-space distortion measurements
No full textThe simplest theory describing large-scale redshift-space distortions (RSD), based on linear theory and distant galaxies, depends on the growth of cosmological structure, suggesting that strong tests of general relativity can be constructed from galaxy surveys. As data sets become larger and the expected constraints more precise, the extent to which the RSD follow the simple theory needs to be assessed in order that we do not introduce systematic errors into the tests by introducing inaccurate simplifying assumptions. We study the impact of the sample geometry, non-linear processes and biases induced by our lack of understanding of the radial galaxy distribution on RSD measurements. Using Large Suite of Dark Matter Simulations of the Sloan Digital Sky Survey II (SDSS-II) luminous red galaxy data, these effects are shown to be important at the level of 20per cent. Including them, we can accurately model the recovered clustering in these mock catalogues on scales 30-200h -1Mpc. Applying this analysis to robustly measure parameters describing the growth history of the Universe from the SDSS-II data gives f(z= 0.25)σ 8(z= 0.25) = 0.3512 ± 0.0583 and f(z= 0.37)σ 8(z= 0.37) = 0.4602 ± 0.0378 when no prior is imposed on the growth rate, and the background geometry is assumed to follow a Λ cold dark matter (ΛCDM) model with the Wilkinson Microwave Anisotropy Probe (WMAP)+Type Ia supernova priors. The standard WMAP constrained ΛCDM model with general relativity predicts f(z= 0.25)σ 8(z= 0.25) = 0.4260 ± 0.0141 and f(z= 0.37)σ 8(z= 0.37) = 0.4367 ± 0.0136, which is fully consistent with these measurements. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Three Curious Properties of the Sample Variance and Autocovariance for Stationary Processes with Unknown Mean
No full textIn most books on time series analysis, estimators of the variance and autocovariance for a stationary process are discussed under the assumption that the process mean is known. Here we illustrate that, if the process mean is unknown and hence is estimated by the sample mean, these estimators have some surprising properties. KEYWORDS: Time series analysis; sample variance; sample autocovariance; stationary processes # Donald B. Percival is Senior Mathematician, Applied Physics Laboratory, College of Ocean and Fishery Sciences, HN--10, University of Washington, Seattle, WA 98195. The author wishes to thank Brad Bell, Andrew Walden and an anonymous referee for helpful comments that substantially improved the manuscript. The `zero correlation time' issue arose while the author was working with Mike Gregg and Harvey Seim under Gregg's O#ce of Naval Research Contract N00014--86--K--0690, which supported the `Mixing to Mesoscale' University Research Initiative. 1 1. INTRODUCTION Let {X t..
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
From quantum stochastic differential equations to Gisin-Percival state diffusion
No full textStarting from the quantum stochastic differential equations of Hudson and Parthasarathy Commun. Math. Phys. 93, 301 (1984) and exploiting the Wiener-Itô-Segal isomorphism between the boson Fock reservoir space �(L2(�+)�(�n��n)) and the Hilbert space L2(μ), where μ is the Wiener probability measure of a complex n-dimensional vector-valued standard Brownian motion (B(t),t�0), we derive a non-linear stochastic Schrödinger equation describing a classical diffusion of states of a quantum system, driven by the Brownian motion B. Changing this Brownian motion by an appropriate Girsanov transformation, we arrive at the Gisin-Percival state diffusion equation N. Gisin and J. Percival, J. Phys. A 167, 315 (1992). This approach also yields an explicit solution of the Gisin-Percival equation, in terms of the Hudson-Parthasarathy unitary process and a randomized Weyl displacement process. Irreversible dynamics of system density operators described by the well-known Gorini-Kossakowski-Sudarshan-Lindblad master equation is unraveled by coarse-graining over the Gisin-Percival quantum state trajectories. © 2017 Author(s)
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