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But it 's Ron Moore 's job to prevent collisions in the Tevatron - - at least until the particle bunches reach the detectors and head-on collisions have been initiated at CDF and DZero . Metropolitan access networks are emerging as an important strategy to the backbone network operators reach the final customers . Oracle is capable of treating open file descriptors as a cache , automatically closing files when the number of open file descriptors reaches the operating system-defined limit . A low value makes new sound samples reach the loudspeakers quickly at the risk of gaps in the output stream . One brief episode occurred June 16-17 , when ozone levels reached the orange and red levels in much of eastern Wisconsin .