7,712 research outputs found
Report upon the Disabled Rhode Island Soldiers
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
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
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
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 -function of the kdV hierarchy corresponding
to the Kontsevich model (and not the square of the -function) except for
some complications at genus zero.Comment: 17 pages, Late
Effects of Thermal Discharge Upon a Subarctic Stream: Completion Report
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
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 -valued maps
The theory of lifting classes and the Reidemeister number of single-valued
maps of a finite polyhedron is extended to -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 -valued map split into self-maps of the universal
covering space of that we call lift-factors. An equivalence relation is
defined on the lift-factors of and the number of equivalence classes is the
Reidemeister number of . The fixed point classes of 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
such that the number of equivalence classes equals the Reidemeister number. We
prove that if 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 -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
-valued map equals its Reidemeister number. If an -valued map splits into
single-valued maps, then its -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
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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