There are a number of applications for microstructure devices consisting of a regular pattern of perforations, and many of these utilize fluid damping.
Results show for example that circular holes with two geometrical distribution patterns are achievable, and unique patterns of perforation can be designed to discourage counterfeiting.
This work provides an insight to guide the design of perforation pattern and application of injection in terms of optimization of the hydrocarbon production.
The appearance of fibreboard can be enhanced by overlays or patterns of perforations, tiles, simulated leather, and other designs.
Three patterns of perforations are studied.
The plasticity of bone wax plates allows approximation of the pattern of set perforation marks to give an approximation of the tissue damage created by the instruments.
The results of the effect of perforation shape and pattern in drainpipes and of envelope materials on drainage performance are summarized and the latest design criteria of granular materials and synthetic envelopes presented.
On the other hand, assessing the effect of membrane morphology pattern on the perforation risk revealed that the polyp type has the lowest risk of perforation, whereas the irregular type represents the most insecure pattern.
The overall temporal fragmentation pattern of natural forests had a "perforation-subdivision/shrinkage-attrition" pathway, which corresponded to Forman's landscape fragmentation rule, while the plantation forests did not follow the rule strictly.
A retrospective study from Norway report that a cohort pattern in prevalence of smoking partly explained the cohort pattern in perforation risk for both sexes [ 18].
