The system of bose liquid + impurity is considered. The energy spectrum, as well as effective mass of impurity is calculated. For the case of an 3 He atom in superfluid 4 He numerical calculations are performed.

Incorporation of massive cortical bone allografts in the human is slow and remains incomplete. Late biopsies of implanted allografts or histological studies of explanted allografts always show the partial substitution of necrotic bone by new bone from the host. The aim of the present study was to evaluate the value of drilling the massive deep-frozen cortical allografts in order to induce osteogenesis. Thirteen sheep were operated on and a standard segment of the proximal ulna was removed and the gap filled either by an unperforated allograft or by a perforated one. Based on histological and microradiographic examination, a complete substitution of the perforated allografts was observed but in this model no statistically significant difference was observed between perforated and unperforated allografts. Further study is needed to assess the effect of the perforations.

No abstract

Mimeo.com is employing several new Lean Production System concepts in its new expansion plant start-up. Building on several successful Discrete Event Simulations using ProModel, the company employed a new model to simulate the material flow in the new plant design. This case study illustrates how simulations can be used effectively to plan, analyze and communicate new concepts prior to deploying them in production.2928 978-1-4244-2708-6/08/$25.00