Dynamics and delocalisation transition for an interface driven by a uniform shear flow

We study the effect of a uniform shear flow on an interface separating the two broken-symmetry ordered phases of a two-dimensional system with nonconserved scalar order parameter. The interface, initially flat and perpendicular to the flow, is distorted by the shear flow. We show that there is a critical shear rate, \gamma_c, proportional to 1/L^2, (where L is the system width perpendicular to the flow) below which the interface can sustain the shear. In this regime the countermotion of the interface under its curvature balances the shear flow, and the stretched interface stabilizes into a time-independent shape whose form we determine analytically. For \gamma > \gamma_c, the interface acquires a non-zero velocity, whose profile is shown to reach a time-independent limit which we determine exactly. The analytical results are checked by numerical integration of the equations of motion.Comment: 5 page

Genetic improvement of meat quality and fertility using the national nucleus

Knowledge is power and the National Swine Registry (NSR) is the only source of complete, publicly available, genetic records on nucleus populations. NSR has offered STAGES \u27, a BLUP genetic improvement program with bio-economic indexes for over 17 years. NSR members submit information on 3 sow productivity traits and 3 postweaning performance traits and in return receive across-herd Expected Progeny Deviations (EPDs) for these traits along with indexes for Sow Productivity, Maternal Line (sow productivity and postweaning performance) and Terminal (postweaning traits only) to be used in genetic selection. Not only is this genetic information available to members but genetic values and trends for these traits are also available to any commercial producer or genetic advisor. This program has led NSR members to make substantial genetic improvement for these traits within all four breeds. In addition, this transparent system allows commercial producers to design programs and select animals that allow them the greatest potential for their situation. As the pork industry continues ro change, multiple pork chains are forming to meets distinct specifications desired by subsets of consumers. To continue to meet the demand of these dissimilar pork chains, differentiated genetic lines are necessary to provide products that match their specifications. In addition, as profit per pig continues to decline pork producers must be able to increase product sold per unit of investment. To facilitate this key profitability indicator, the fertility of breeding females must improve. To address these two key drivers in today\u27s pork industry, the NSR has updated their genetic improvement program in these two areas

Behavior specification in a software design system

A technique for software system behavior specification appropriate for use in designing systems with concurrency is presented. The technique is based upon a generalized ability to define events, or significant occurrences in a software system, and then indicate whatever constraints the designer might wish to see imposed upon the ordering or simultaneity of those events. Constructs implementing this technique in the DREAM software design system are presented and illustrated. The relationship of this technique to other behavior specification techniques is also discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25196/1/0000635.pd