Thruster sealing system and apparatus

A thruster nozzle sealing system and apparatus is provided for protection of spacecraft thruster motors. The system includes a sealing plug, a sealing plug insertion tool, an outer cover, an outer cover attachment, and a ferry flight attachment. The sealing plug prevents moisture from entering the thruster engine so as to prevent valve failure. The attachments are interchangeably connectable with the sealing plug. The ferry flight attachment is used during air transportation of the spacecraft, and the outer cover attachment is used during storage and service of the spacecraft. The outer cover provides protection to the thruster nozzle from mechanical damage

A survey of Wall's finiteness obstruction

Wall's finiteness obstruction is an algebraic K-theory invariant which decides if a finitely dominated space is homotopy equivalent to a finite CW complex. The object of this survey is to describe the invariant (which was first formulated in 1965) and some of its many applications to the surgery classification of manifolds.Comment: LATEX 16 pages, uses XYPIC diagram package, and 3 .PS figures inserted by EPSF. This paper will be published in early 2001 in Volume 2 of "Surveys on Surgery Theory", Annals of Mathematics Studies, Princeton University Press (check their website http://pup.princeton.edu for final publication details

Problems on homology manifolds

A list of problems prepared for the proceedings of the Workshop on Exotic Homology Manifolds, Oberwolfach June 29-July 5 2003.Comment: This is the version published by Geometry & Topology Monographs on 22 April 200

The quadratic form E_8 and exotic homology manifolds

An explicit (-1)^n-quadratic form over Z[Z^{2n}] representing the surgery problem E_8 x T^{2n} is obtained, for use in the Bryant-Ferry-Mio-Weinberger construction of 2n-dimensional exotic homology manifolds.Comment: This is the version published by Geometry & Topology Monographs on 22 April 200