The surface reactivity of tributyl thiophosphate on iron surfaces has been studied in situ by attenuated total reflection Fouriertransform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed reaction and desorption spectroscopies. The results show that at temperatures lower than 373 K the molecule forms a physisorbed layer on the iron substrate. At 373 K a reaction takes place with the formation of an organic layer, together with iron polyphosphate and sulfate. At higher temperatures temperature-programmed desorption results suggest that the mechanism involves P-O bond scission to yield butoxy groups. This could be preceded by P=S bond scission to give tributyl phosphite, which then, in turn, undergoes P-O bond scission to produce butoxy groups. The results obtained following tribological testing are in agreement with those of thermal tests: evidence of polyphosphate and sulfate formation is found.

A new multiprocessor architecture, called orthogonal multiprocessor (OMP), is proposed in this paper. This OMP architecture has a simplified busing structure and partially shared memory, which compares very favorably over fully shared-memory multiprocessors using crossbar switch, multiple buses, or multistage networks. The higher performance comes mainly from significantly increased memory bandwidth, fully exploited parallelism, reduced communication overhead, and lower hardware control complexities. Parallel algorithms being mapped include matrix arithmetic, linear system solver, FFT, array sorting, linear programming, and parallel PDE solutions. In most cases, linear speedup can be achieved on the OMP system. The OMP architecture provides linearly scalable performance and is well suited for building special-purpose scientific computers such as for signal/image processing, machine sorting, linear system solvers, and PDE machines, etc.

Vapor phase lubrication (VPL) has been proposed as a method for lubrication of high temperature engines. During VPL, lubricants such as tricresylphosphate (TCP), (CH 3 -C 6 H 4 O) 3 P=O, are delivered through the vapor phase to high temperature engine parts and react on their surfaces to deposit a thin, solid, lubricating film. Although ceramics such as SiC are desirable materials for high temperature applications, their surfaces are unreactive for the decomposition of TCP and thus not amenable to VPL. As a means of activating the SiC surface for TCP decomposition we have used chemical vapor deposition of Fe from Fe(CO) 5 . Modification of the SiC surface with adsorbed Fe accelerates subsequent decomposition of TCP and deposition of P and C onto the surface. In the temperature range 500-800 K, m-TCP decomposes more readily on Fe-coated SiC surfaces than on SiC surfaces. The C and P deposition rates depend on the thickness of the Fe film and are further enhanced by oxidation of the Fe. This work provides a proof-of-concept demonstration of the feasibility of using VPL for ceramics.