5,681 research outputs found
An Assessment of an Experimental Surgery Scheme in General Practice
A study of aspects of the work and of the opinions of patients and staff was made at times over a period of two years before and one year after the opening of an experimental surgery tmit specially designed for a particular way of organising the doctor/nurse team in general practice. The investigation took place in a busy group practice of three doctors caring between them for over
9000 patients living in a London borough
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Stereolithography Cure Process Modeling Using Acrylate Resin
In this paper, a complex stereolithography (SL) cure process model is presented that
incorporates transient thermal and chemical effects which influence final part shape and
properties. The model incorporates photopolymerization, mass diffusion, and heat transfer.
Material properties are characterized and a comprehensive kinetic model parameterized for a
model compound system. SL process simulations are performed using finite element methods
with the software package FEMLAB, and validated by the capability of predicting the fabricated
part dimensions. A degree of cure (DOC) threshold model is proposed which can predict the cure
line size within 15% error, comparing with 30% prediction error by the exposure threshold
model currently used in SL. Furthermore, through the sensitivity analysis conducted by the
process model presented here, the sensitive parameters are identified and the SL bath
temperature, photointiator absorptivity and concentration are found to be the most sensitive
factors that affect the SL fabrication results. The sensitive variables will be the focus of further
research meant to improve SL process speed and resolution.Mechanical Engineerin
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