7,712 research outputs found

    Report upon the Disabled Rhode Island Soldiers

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    Dr. Lloyd Morton, (who will associate with him, Mrs. Albert Dailey,) is hereby appointed a Commission to proceed to Washington, on a tour of inspection, having in view the welfare of the sick and wounded soldiers in hospital or otherwise, belonging to Rhode Island regiments

    Differential Galois Theory of Linear Difference Equations

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    We present a Galois theory of difference equations designed to measure the differential dependencies among solutions of linear difference equations. With this we are able to reprove Hoelder's Theorem that the Gamma function satisfies no polynomial differential equation and are able to give general results that imply, for example, that no differential relationship holds among solutions of certain classes of q-hypergeometric functions.Comment: 50 page

    Improvement of the Fairbanks Atmospheric Carbon Monoxide Transport Model -- A Program for Calibration, Verification and Implementation

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    Completion Report Prepared for the Research Section, Alaska Department of Transportation and Public FacilitiesIn the early 70s, state, local and federal officials in Fairbanks, Alaska, became concerned with the rising incidence of high carbon monoxide episodes. Because of that concern, the Alaska Department of Highways (forerunner of the Department of Transportation and Public Facilities) and the Fairbanks North Star Borough requested that the Institute of Water Resources undertake a study to develop a computer model capability for understanding the transport of carbon monoxide and other pollutants within the Fairbanks airshed. The work was completed in June of 1976. Two publications (Carlson and Fox, 1976; Norton and Carlson, 1976) describe the initial development, documentation and implementation of the computer model. The model, ACOSP (Atmospheric Carbon monOxide Simulation Program), describes the two-dimensional behavior of pollutants in the atmosphere via solution of the convection-diffusion equation using the finite element method of numerical analysis

    From 1-matrix model to Kontsevich model

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    Loop equations of matrix models express the invariance of the models under field redefinitions. We use loop equations to prove that it is possible to define continuum times for the generic hermitian {1-matrix} model such that all correlation functions in the double scaling limit agree with the corresponding correlation functions of the Kontsevich model expressed in terms of kdV times. In addition the double scaling limit of the partition function of the hermitian matrix model agree with the τ\tau-function of the kdV hierarchy corresponding to the Kontsevich model (and not the square of the τ\tau-function) except for some complications at genus zero.Comment: 17 pages, Late

    Effects of Thermal Discharge Upon a Subarctic Stream: Completion Report

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    The work upon which this report is based was supported in part by funds provided by the United States Department of Interior, Office of Water Research and Technology (Project B-020-ALAS), as authorized by the Water Resources Research Act of 1964, Public Law 88-279, as amended; in part by funds provided by the Municipal Utility System of the City of Fairbanks, Alaska; and in part by funds provided by the University of Alaska, Fairbanks

    Chromatographic separation and identification of some peptides in partial hydroylsates of gelatin

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    Recently we have been engaged in a study of the chemical structure of collagen and gelatin with the object of determining the sequence of the amino acid residues in the polypeptide chains of these proteins. In the course of this study we have made considerable progress in the chromatographic analysis of complex mixtures of peptides and we have isolated and identified several simple peptides which occur in partial hydrolysates of gelatin. The initial separation of the mixture into zones of one or more peptides has been made on a column of ion exchange resin; further separation of the peptides in each zone has been achieved by chromatographing in the form of dinitrophenyl (DNP) peptides on columns of silicic acid-Celite. It is to be hoped that the particular combination of chromatographic methods which has been successfully used in the present study will be helpful in the resolution of the complex mixtures which result from the partial hydrolysis of other proteins

    Lifting classes for the fixed point theory of nn-valued maps

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    The theory of lifting classes and the Reidemeister number of single-valued maps of a finite polyhedron XX is extended to nn-valued maps by replacing liftings to universal covering spaces by liftings with codomain an orbit configuration space, a structure recently introduced by Xicot\'encatl. The liftings of an nn-valued map ff split into self-maps of the universal covering space of XX that we call lift-factors. An equivalence relation is defined on the lift-factors of ff and the number of equivalence classes is the Reidemeister number of ff. The fixed point classes of ff are the projections of the fixed point sets of the lift-factors and are the same as those of Schirmer. An equivalence relation is defined on the fundamental group of XX such that the number of equivalence classes equals the Reidemeister number. We prove that if XX is a manifold of dimension at least three, then algebraically the orbit configuration space approach is the same as one utilizing the universal covering space. The Jiang subgroup is extended to nn-valued maps as a subgroup of the group of covering transformations of the orbit configuration space and used to find conditions under which the Nielsen number of an nn-valued map equals its Reidemeister number. If an nn-valued map splits into nn single-valued maps, then its nn-valued Reidemeister number is the sum of their Reidemeister numbers.Comment: near complete rewrite from previous versio

    Storage and hydrolysis of seawater samples for inorganic carbon isotope analysis

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    Preservation of seawater samples was tested for total inorganic carbon (ΣCO2), stable carbon isotope (δ13C), and radiocarbon (14C) applications using foil bags and storage by refrigeration and freezing. The aim was to preserve representative samples with minimal storage effects but without using toxic methods such as mercuric chloride poisoning. Hydrolysis of samples to CO2 was based on existing methods. Results of IAEA-C2 standard used with deionized water stored in the foil bags showed complete reaction yields, 14C results within 2σ of the consensus value, and δ13C that were internally consistent, indicating that there were no procedural effects associated with the foil bags. 14C results were statistically indistinguishable across the storage times, for frozen and refrigerated seawater samples from a coastal site, Elie Ness, Fife, UK. The scatter of ΣCO2 concentrations and δ13C was within scatter observed in other studies for lake- and seawater samples preserved by acidification or using mercuric chloride. However, both ΣCO2 and δ13C were less variable for frozen samples compared with refrigerated samples. The foil bags are lighter, safer to transport, and similar in cost to glass bottles and allow sample collection in the field and transfer to the hydrolysis vessel without exposure of the sample to atmosphere. Storage of seawater samples in the foil bags was considered a reliable, alternative method to poisoning for ΣCO2, δ13C, and 14C, and freezing the samples is recommended for storage time beyond a week
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