189,220 research outputs found
Modularity in support of design for re-use
We explore the structuring principle of modularity with the objective of analysing its current ability to meet the requirements of a 're-use' centred approach to design. We aim to highlight the correlation's between modular design and 're-use', and argue that it has the potential to aid the little-supported process of 'design-for-re-use'. In fulfilment of this objective we not only identify the requirements of 'design-for-re-use', but also propose how modular design principles can be extended to support 'design-for-re-use'
Economical technique for fragmentation testing
Automatic rifle was modified for remote, single-shot use. To simulate statistically--determined fragment size from rocket-motor casing blunt-nosed bullet was made of same alloy. Cartridge was loaded with enough powder to make bullet reach target at same estimated velocity as shrapnel from rocket casing
Re-using knowledge : why, what and where
Previously the 're-use' focus has centred on specific and/or standard parts, more recently however, [standard components] are being developed...to enable both the re-use of the part and the experience associated with that part'. This notion is further extended by Finger who states that 'designers may re-use a prior design in it's entirety,...may re-use an existing shape for a different function, or may re-use a feature from another design'. Reinforcing this notion we currently consider re-use to reflect the utilisation of any knowledge gained from a design activity and not just past designs of artefacts. Our research concerns the improvement of formal 're-use' support and as such we have identified a need to gain a better understanding of how design knowledge can be utilised to support 're-use'. Thus, we discuss the requirements of successful 're-use' and attempt to ascertain within this skeleton: what knowledge can be re-used; how to maximise its' applicability; and where and when it can be utilised in new design
Some Properties of Amplitudes at Multi Boson Thresholds in Spontaneously Broken Scalar Theory
It is shown that in a theory of one real scalar field with
spontaneous breaking of symmetry a calculation of the amplitudes of production
by a virtual field of on-mass-shell bosons all being exactly at rest
is equivalent in any order of the loop expansion to a Euclidean space
calculation of the mean field of a kink-type configuration. Using this
equivalence it is found that all the amplitudes have no absorptive
part at the thresholds to any order of perturbation theory. This implies
non-trivial relations between multi-boson threshold production amplitudes. In
particular the on-mass-shell amplitude of the process should vanish
at the threshold in all loops. It is also shown that the factor in the amplitudes at the threshold is not eliminated by loop effects.Comment: 11 pages including 3 figures, LaTeX, TPI-MINN-92/61-
Properties of perturbative multi-particle amplitudes in and theories
Threshold amplitudes are considered for multi-particle production in
and theories. It is found that the disappearance of tree-level
threshold amplitudes of on-shell particles producing a large number of
particles occurs in theory only for and . The one-loop
correction to the threshold amplitude for a highly virtual scalar particle
decaying into particles in an model is derived.Comment: 7 pages, LaTex, TPI-MINN-92/60-
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