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Grand Canyon National Park (GCNP) is a mandatory Class I federal area that is afforded visibility protection under the Federal Clean Air Act. In this paper, we have examined the effects on visibility and particulate sulfur (Sp) at GCNP as a result of reducing sulfur dioxide (SO2) emissions by 90% from the Navajo Generating Station (NGS). Scrubbers were(More)
Three implementations of a concurrently-updateable linked list were compared, one that emulates a lock-free approach based on a compare-and-swap instruction, one that makes direct use of the Cray XMT's full-empty synchronization bits on every word of memory, and a third that uses the XMT's atomic int_fetch_add instruction. The relative performance of the(More)
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