15,230 research outputs found
Alternate Dispute Resolution As An Alternative to the Litigation of Non-Union Employee Claims of Illegal Termination
Paper Presented to the Commission on the Future of Worker-Management Relations.Paper_Tobias_040694.pdf: 795 downloads, before Oct. 1, 2020
String theory in target space
It is argued that the complete S-matrix of string theory at tree level in a
flat background can be obtained from a small set of target space properties,
without recourse to the worldsheet description. The main non-standard inputs
are (generalised) Britto-Cachazo-Feng-Witten shifts, as well as the monodromy
relations for open string theory and the Kawai-Lewellen-Tye relations for
closed string theory. The roots of the scattering amplitudes and especially
their appearance in the residues at the kinematic poles are central to the
story. These residues determine the amplitudes through on-shell recursion
relations. Several checks of the formalism are presented, including a
computation of the Koba-Nielsen amplitude in the bosonic string. Furthermore
the question of target space unitarity is (re-)investigated. For the Veneziano
amplitude this question is reduced by Poincare invariance, unitarity and
locality to that of positivity of a particular numerical sum. Interestingly,
this analysis produces the main conditions of the no-ghost theorem on dimension
and intercept from the first three poles of this amplitude.Comment: 66 pages, many figure
A time-based concept for terminal-area traffic management
An automated air-traffic-management concept that has the potential for significantly increasing the efficiency of traffic flows in high-density terminal areas is discussed. The concept's implementation depends on the techniques for controlling the landing time of all aircraft entering the terminal area, both those that are equipped with on-board four dimensional guidance systems as well as those aircraft types that are conventionally equipped. The two major ground-based elements of the system are a scheduler which assigns conflict-free landing times and a profile descent advisor. Landing times provided by the scheduler are uplinked to equipped aircraft and translated into the appropriate four dimensional trajectory by the on-board flight-management system. The controller issues descent advisories to unequipped aircraft to help them achieve the assigned landing times. Air traffic control simulations have established that the concept provides an efficient method for controlling various mixes of four dimensional-equipped and unequipped, as well as low-and high-performance, aircraft
The min--max construction of minimal surfaces
In this paper we survey with complete proofs some well--known, but hard to
find, results about constructing closed embedded minimal surfaces in a closed
3-dimensional manifold via min--max arguments. This includes results of J.
Pitts, F. Smith, and L. Simon and F. Smith.Comment: 42 pages, 13 figure
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