549,616 research outputs found
Martingales, endomorphisms, and covariant systems of operators in Hilbert space
We show that a class of dynamical systems induces an associated operator
system in Hilbert space. The dynamical systems are defined from a fixed
finite-to-one mapping in a compact metric space, and the induced operators form
a covariant system in a Hilbert space of L^2-martingales. Our martingale
construction depends on a prescribed set of transition probabilities, given by
a non-negative function. Our main theorem describes the induced martingale
systems completely. The applications of our theorem include wavelets, the
dynamics defined by iterations of rational functions, and sub-shifts in
symbolic dynamics.
In the theory of wavelets, in the study of subshifts, in the analysis of
Julia sets of rational maps of a complex variable, and, more generally, in the
study of dynamical systems, we are faced with the problem of building a unitary
operator from a mapping r in a compact metric space X. The space X may be a
torus, or the state space of subshift dynamical systems, or a Julia set. While
our motivation derives from some wavelet problems, we have in mind other
applications as well; and the issues involving covariant operator systems may
be of independent interest.Comment: 44 pages, LaTeX2e ("jotart" document class); v2: A few opening
paragraphs were added to the paper; an addition where a bit of the history is
explained, and where some more relevant papers are cited. Corrected a
typographical error in Proposition 8.1. v3: A few minor additions: More
motivation and explanations in the Intro; Remark 3.3 is new; and eleven
relevant references/citations are added; v4: corrected and updated
bibliography; v5: more bibliography updates and change of LaTeX document
clas
Problems of organizational structure in C3 systems
"March, 1982."Bibliography: p. 54.With: On modeling teams of interacting decisionmakers with bounded rationality / Alexander H. Levis, Kevin L. Boettcher. Cambridge, Mass. : Laboratory for Information and Decision Systems, Massachusetts Institute of Technology, [1982]NASA Grant No. NAG1-2by Alexander H. Levis
Aspects of phosphorus nutrition in endomycorrhizal fungi of the Ericaceae
Bibliography: pages 133-144.An investigation was undertaken on the phosphorus nutrition of the ericoid endophytes isolated from the root systems of Vaccinium macrocarpon, Aiton, Rhododendron ponticum L., Calluna vulgaris (L.) Hull, Erica hispidula L., and E. mauritanica L
On the origin of the galaxy luminosity function
Evidence is summarized that suggests that when a protogalaxy collapses, a
fraction of its gas fails to heat to the virial temperature, where is
large for haloes less massive than the value associated with
galaxies. Stars and galaxies form only from the cool gas fraction. Hot gas is
ejected from low-mass systems as in conventional semi-analytic models of galaxy
formation. In high-mass systems it is retained but does not cool and form
stars. Instead it builds up as a largely inert atmosphere, in which cooling is
inhibited by an episodically active galactic nucleus. Cold gas frequently falls
into galactic haloes. In the absence of a dense atmosphere of
virial-temperature gas it builds up on nearly circular orbits and forms stars.
When there is a sufficiently dense hot atmosphere, cold infalling gas tends to
be ablated and absorbed by the hot atmosphere before it can form stars. The
picture nicely explains away the surfeit of high-luminosity galaxies that has
recently plagued semi-analytic models of galaxy formation, replacing them by
systems of moderate luminosity from old stars and large X-ray luminosities from
hot gas.Comment: 5 pages. Version to appear in MNRAS Minor changes & corrected
bibliography since first versio
Publications of the Jet Propulsion Laboratory, July 1961 through June 1962
Jpl bibliography on space science, 1961-196
A Bibliography on Fuzzy Automata, Grammars and Lanuages
This bibliography contains references to papers on fuzzy formal languages, the generation of fuzzy languages by means of fuzzy grammars, the recognition of fuzzy languages by fuzzy automata and machines, as well as some applications of fuzzy set theory to syntactic pattern recognition, linguistics and natural language processing
Cold climate water/wastewater transportation and treatment - a bibliography: completion report
This bibliography contains 1,400 citations, including published and unpublished papers, on cold-climate water and wastewater transportation and treatment systems. Sources listed include state and federal agency files which contain information on systems in Alaskan communities and
the Alyeska Pipeline Service Company camps. References to systems in other northern countries are also included.
The objectives of this study were to identify causes of the failure of Alaskan water and wastewater treatment and transportation facilities and to seek methods for design improvements. Originally, the investigators contemplated an evaluation of systems performance in remote areas
in relation to the original conception, planning, design, and construction.
Because of the tremendous amount of literature examined, the evaluation was undertaken in a subsequent study, "Alaska Wastewater Treatment Technology" (A-058-ALAS) by Dr. Ronald A. Johnson.OWRT AGREEMENT NO. 14-31-0001-5002
PROJECT NO. A-047-ALAS The work upon which this completion report is based was supported by funds provided by the U. S. Department of the Interior, Office of Water
Research and Technology, as authorized under the Water Resources Research
Act of 1964, Public Law 88-379, as amended
A Bibliography of Community Analyses for Libraries
published or submitted for publicatio
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