1,515 research outputs found

    Telemetry coding study for the international magnetosphere explorers mother-daughter and heliocentric missions. Volume 1: Summary

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    The convolutional coding study on the IME Mother-Daughter and Heliocentric spacecraft is reported. The three major tasks involved in the study are summarized

    Power spectrum analysis of staggered quadriphase-shift-keyed signals

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    Mathematical analysis of power spectrum of outputs from high-reliability communication system is used to determine system bandwidth. Analysis provides mathematical relationships of signal power spectrum at output of hard limiter for any type of baseband pulse input subjected only to output parameter constraints

    SEDIMENT, CHANNEL MORPHOLOGY, AND STREAMFLOW CHARACTERISTICS OF THE BITTERROOT RIVER DRAINAGE BASIN, SOUTHWESTERN MONTANA

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    The Bitterroot River Basin, located in Southwestern Montana, encompasses a drainage area of 7360 square kilometers and delivers approximately 2.1 billion cubic meters of water and 300 thousand metric tonnes of sediment to the Upper Columbia Drainage Basin per year. Along its course, the Bitterroot River follows a complex pattern of straight, sinuous and anastomosing channels. Through the central Bitterroot Valley between Hamilton and Stevensville Montana, the Bitterroot River carries abundant Loose gravel and uprooted trees and is subject to frequent channel shifts. Hydrologic data for the Bitterroot Basin indicate that the Bitterroot River has an inherently unstable hydraulic configuration and is depositing sediment through much of the central valley. As a result of this instability, the Bitterroot River reacts abruptly to external perturbation and has undergone appreciable channel readjustments during historic time. At a reconnaissance Level, the Bitterroot River appears to be reacting to recent climatic and human disturbances to the watershed, and may be adjusting to Long-term tectonic movement in the Basin. The tables presented in this report summarize an extensive data-base on streamflow, hydraulic geometry, sediment Load, and sediment characteristics for the Bitterroot Basin. Much of this data is applicable to the analysis of stream channels in Western Montana and the surrounding Rocky Mountain region

    Telemetry coding study for the international magnetosphere explorers, mother/daughter and heliocentric missions. Volume 2: Final report

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    A convolutional coding theory is given for the IME and the Heliocentric spacecraft. The amount of coding gain needed by the mission is determined. Recommendations are given for an encoder/decoder system to provide the gain along with an evaluation of the impact of the system on the space network in terms of costs and complexity

    Shuttle communications design study

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    The design and development of a space shuttle communication system are discussed. The subjects considered include the following: (1) Ku-band satellite relay to shuttle, (2) phased arrays, (3) PN acquisition, (4) quadriplexing of direct link ranging and telemetry, (5) communications blackout on launch and reentry, (6) acquisition after blackout on reentry, (7) wideband communications interface with the Ku-Band rendezvous radar, (8) aeroflight capabilities of the space shuttle, (9) a triple multiplexing scheme equivalent to interplex, and (10) a study of staggered quadriphase for use on the space shuttle

    Operations on integral lifts of K(n)

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    This very rough sketch is a sequel to arXiv:1808.08587; it presents evidence that operations on lifts of the functors K(n) to cohomology theories with values in modules over valuation rings of local number fields, indexed by Lubin-Tate groups of such fields, are extensions of the groups of automorphisms of the indexing group laws, by the exterior algebras on the normal bundle to the orbits of the group laws in the space of lifts.Comment: \S 2.0 hopefully less cryptic. To appear in the proceedings of the 2015 Nagoya conference honoring T Ohkawa. Comments very welcome

    The effect of molybdenum on growth rates, photosynthetic rates and nitrogen assimilation in freshwater plankton algae.

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    Dept. of Biological Sciences. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1973 .C28. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.Sc.)--University of Windsor (Canada), 1973

    Univalent Foundations and the UniMath Library

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    We give a concise presentation of the Univalent Foundations of mathematics outlining the main ideas, followed by a discussion of the UniMath library of formalized mathematics implementing the ideas of the Univalent Foundations (section 1), and the challenges one faces in attempting to design a large-scale library of formalized mathematics (section 2). This leads us to a general discussion about the links between architecture and mathematics where a meeting of minds is revealed between architects and mathematicians (section 3). On the way our odyssey from the foundations to the "horizon" of mathematics will lead us to meet the mathematicians David Hilbert and Nicolas Bourbaki as well as the architect Christopher Alexander

    Uniform generation in trace monoids

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    We consider the problem of random uniform generation of traces (the elements of a free partially commutative monoid) in light of the uniform measure on the boundary at infinity of the associated monoid. We obtain a product decomposition of the uniform measure at infinity if the trace monoid has several irreducible components-a case where other notions such as Parry measures, are not defined. Random generation algorithms are then examined.Comment: Full version of the paper in MFCS 2015 with the same titl
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