Our final project is an extention of the Lab4 ShardKV store that is both faster and more reliable. Our main areas of implementation were 1) The Mencius variant of the Paxos protocol, 2) A persistence architecture which uses periodic checkpointing, and 3) A deployment framework for testing a real-life distributed key-value store over Amazon’s AWS.

Described here is a model for the long-time formation and evolution of erodible beds under the action of waves and currents. It is an extention of a model rst developed by Craik and Leibovich, which describes the dynamics of Langmuir circulation cells, later adapted by McWilliams and Restrepo to model the interaction of a gravity wave eld with global oceanic ows.

Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data resolve a long-standing puzzle of the nature of the Roper resonance, and confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the nucleon. The data on high Q nπ production confirm the slow fall off of the S11(1535) trans...