Self-consistent solution of the Schwinger-Dyson equations for the nucleon and meson propagators

The Schwinger-Dyson equations for the nucleon and meson propagators are solved self-consistently in an approximation that goes beyond the Hartree-Fock approximation. The traditional approach consists in solving the nucleon Schwinger-Dyson equation with bare meson propagators and bare meson-nucleon vertices; the corrections to the meson propagators are calculated using the bare nucleon propagator and bare nucleon-meson vertices. It is known that such an approximation scheme produces the appearance of ghost poles in the propagators. In this paper the coupled system of Schwinger-Dyson equations for the nucleon and the meson propagators are solved self-consistently including vertex corrections. The interplay of self-consistency and vertex corrections on the ghosts problem is investigated. It is found that the self-consistency does not affect significantly the spectral properties of the propagators. In particular, it does not affect the appearance of the ghost poles in the propagators.Comment: REVTEX, 7 figures (available upon request), IFT-P.037/93, DOE/ER/40427-12-N9

FFTF primary system transition to natural circulation from low reactor power

Plans for reactor and primary loop natural circulation testing in the Fast Flux Test Facility (FFTF) are summarized. Detailed pretest planning with an emphasis on understanding the implications of process noise and model uncertainties for model verification and test acceptance are discussed for a transition to natural circulation in the reactor core and primary heat transport loops from initial conditions of 5% of rated reactor power and 75% of full flow

Adaptive self-regulation: A process view of managerial effectiveness

This article describes a set of processes involved in attaining managerial effectiveness. These processes are components of an adaptive self-regulation framework. They involve the active management of constituencies' role expectations and performance opinions through standard-setting, discrepancy-detection, and discrepancy-reduction. These processes serve to enhance constitutents' opinions of the manager's effectiveness. Several social and contextual factors that either facilitate or inhibit managers' self-regulation efforts are identified and hypotheses to guide future empirical research are offered.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31730/1/0000669.pd