30,403 research outputs found
Report on visit to four North American airlines
The object of the visits was to discuss the current state-of-the-art
with the Engineering Departments of several North American airlines which were
known to be leading the field in the application of certain advanced techniques.
In the limited time available it was decided to confine the talks mainly to
those topics on which the chosen operators were known to have had unique
experience.
This note is presented in chronological sequence and is only intended
to be a record of the information gathered; no derivations, or comparisons with
other operators, are made.
United Air Lines were visited first and reliability programmes are
detailed, although the application of critical path techniques to aircraft and
engine overhaul is summarised. Continental Air Lines are noted for their use
of the continuous maintenance philosophy, and this is reported next. The third
visit was to Air Canada where talks ranged from the applications of operations
research and electronic data processing (EDP) techniques to aircraft evaluation
procedures. Finally the PanAm aircraft system reliability programme is reviewed,
together with a note on their general LDP engineering and maintenance activities.
A bibliography is given, although it should be appreciated that some
of the items listed contain information which may be commercially secure
Liminal reciprocity and factorization statistics
Let denote the number of monic irreducible polynomials in
of degree . We show that for a fixed
degree , the sequence converges -adically to an explicitly
determined rational function . Furthermore we show that the
limit is related to the classic necklace polynomial
by an involutive functional equation, leading to a phenomenon we
call liminal reciprocity. The limiting first moments of factorization
statistics for squarefree polynomials are expressed in terms of a family of
symmetric group representations as a consequence of liminal reciprocity.Comment: 22 pages. To appear in Algebraic Combinatoric
The First Sale Doctrine and Digital Phonorecords
This iBrief follows various phonorecord formats to illustrate the specifics of the First Sale doctrine as it applies to digital phonorecords. The author argues that the disposal of a digital phonorecord by means of distribution infringes an author\u27s exclusive right to reproduce the underlying musical work and this distribution is not subject to First Sale protection
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