The standard isothermal test case of protostellar collapse and binary fragmentation, originally advanced by Boss & Bodenheimer (1979), is here re-investigated using a secondorder-accurate hydrodynamic code written in spherical coordinates. The new test calculation employs a form of the initial m = 2 non-axisymmetric perturbation that is, in contrast with that used in all previous calculations, ...

Program is also acknowledged. For providing and helping decipher the California Energy Commission's database of solar project costs, we thank Todd Lieberg and Tony Brasil (California Energy Commission). Finally, for reviewing earlier versions of this manuscript, we Of course, any remaining errors or omissions are the sole responsibility of the authors.

Great strides have been made in monitoring vibration and combustion performance of gas turbine engines. Challenges still remain in the areas of engine overhaul and design/manufacturing of new turbine/generator systems. This paper discusses some elements of current and future efforts to understand what is happening in Real-Time as new engines are run up for the first time after assembly, overhau...