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Laser shock peening (LSP) is a transient process with laser pulse duration time on the order of 10 ns, real time in situ measurement of laser/material interaction is very challenging. LSP is usually performed in a massively parallel mode to induce uniform compressive residual stress across the entire surface of the workpiece. The purpose of this paper is to(More)
Materials Peeling and sharpening multiwall nanotubes T o realize the full potential of multiwall carbon nanotubes in applications such as biological and scanned probes, it is desirable to develop techniques for controlling their shape and geometry. Here we describe a method by which the outer layers of a multiwall nanotube can be successively removed at the(More)
A simplified arc-method is presented which allows for the continuous synthesis of multi-walled carbon nanotubes. In its basic form, the method requires only a dc power supply, a graphite electrode, and a container of liquid nitrogen with no need for pumps, seals, water-cooled vacuum chambers, or purge-gas handling systems. High-quality nanotubes are(More)
The physics and technological issues involvetl in high gradient part.icle acceleration at high mi-ccowave (RF) frequencies are under study at hIIT. The 17 GHz photocathode RF gun has a lf cell room temperature copper cavit,y wit,h a peak accelerating gradient, of about 250 MI//n-r. The anticipated beam parameters. when operating with a photoemission(More)
We have examined the gypsum (CaSO4·2H2O) scaling phenomena on membranes with different physicochemical properties in forward osmosis (FO) processes. Three hollow fiber membranes made of (1) cellulose acetate (CA), (2) polybenzimidazole (PBI)/polyethersulfone (PES) and (3) PBI-polyhedral oligomeric silsesquioxane (POSS)/polyacrylonitrile (PAN) were studied.(More)
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