Magnetic Monopoles in non-compact QED - is there a Phase Transition?

The existence of the monopole condensation transition reported by Kocic et al. in non-compact, quenched QED is tested. No phase transition is found. This shows that divergence of the `monopole susceptibility' introduced by Hands and Wensley is not a reliable indicator of second order phase transitions. In view of these results I discuss claims that the chiral phase transition seen in QED with fermions is a lattice artefact driven by monopole condensation.Comment: Talk given at lattice '92, 4 pages, uses espcrc2.sty, 2 postscript figures attached. (Replaced to add the figures.) Preprint FUB-HEP 22/9

Stochastic Perturbation Theory and the Gluon Condensate

On the lattice searching for the gluon condensate is difficult because a large perturbative contribution to the expectation value of the action has to be subtracted before looking for a small contribution from a possible gluon condensate. The perturbative calculation therefore has to be very precise. We use a modified version of stochastic perturbation theory to calculate a perturbative series in a boosted coupling, which converges more rapidly than the series with the usual lattice coupling, reducing the uncertainties in our results. We do not see any condensate of dimension two, as suggested by some earlier lattice studies, but we do find a contribution from a dimension four condensate. The value of this condensate is approximately 0.04(1) GeV^4, but with large uncertainties.Comment: 6 pages, 4 figures, contribution to Lattice2005(Theoretical developments

Fluorine disposal

A preliminary design of an F2 dispoal system for HELSTF is presented along with recommendations on operational policy and identification of potential operational problems. The analysis is based on sizing a system to handle two different modes of the HELSTF Fluorine Flow System (one operational and one catastrophic). This information should serve both as a guide to a final detailed design for HELSTF as well as a reference for subsequent monitoring and/or modification of the system which consists of a charcoal reactor followed by a dry soda lime scrubber

Sparger system for MMH-helium vents

Based on a calculated vent flow rate and MMH concentration, a TI-59 program was run to determine total sparger hole area for a given sparger inlet pressure. Hole diameter is determined from a mass transfer analysis in the holding tank to achieve complete capture of MMH. In addition, based on oxidation kinetics and vapor pressure data, MMh atmospheric concentrations are determined 2 ft above the holding tank

NASA SpaceWire Activities/Comments/Recommendations

This viewgraph presentation reviews NASA's activities, and proposes recommendations for the further use of the SpaceWire (SpW). The areas covered in this presentation are: (1) Protocol ID assignment, (2) Protocol development, (3) Plug & Play (PnP), (4) Recommended additions t o SpW protocol and (5) SpaceFibre trade

NASA Multi-Time-Code Mechanism

A viewgraph presentation describing a time code function expansion is shown

SpaceWire Architectures: Present and Future

A viewgraph presentation on current and future spacewire architectures is shown. The topics include: 1) Current Spacewire Architectures: Swift Data Flow; 2) Current SpaceWire Architectures : LRO Data Flow; 3) Current Spacewire Architectures: JWST Data Flow; 4) Current SpaceWire Architectures; 5) Traditional Systems; 6) Future Systems; 7) Advantages; and 8) System Engineer Toolkit