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The design, analysis, and implementation of an accurate delay circuit used to synthesize critical paths in a microprocessor system are presented. The delay circuit includes a novel 64-step programmable calibration delay line that is highly uniform across a wide range of supply voltages and a reconfigurable delay path with tunable delay sensitivity to voltage variations. The calibration delay line...
Polytetrafluoroethylene (PTFE) is an important engineering material because of its unique structure and combination of properties. This paper reports the effect of pneumatic gas pressure on the wear response of PTFE. It is shown that the wear factor decreases significantly with an increase in pneumatic gas pressure. Possible explanations for this phenomenon include the change in mechanical properties...
. In insect-pollinated plants flowers must balance the benefits of attracting pollinators with the cost of attracting natural enemies, when these respond to floral traits. This dilemma can have important evolutionary consequences for mating-system evolution and polymorphisms for floral traits. We investigate the benefits and risks associated with flower size and sex morph variation in Dianthus sylvestris...
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