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Pneumatic system for transferring radioactive samples

Description: A pneumatic sample transfer system has been installed at the Savannah River Laboratory. Radioactive liquid samples are transferred from inside a shielded research cell to a shielded analytical chemistry cell 125 meters away. Samples are drawn into 4-mL glass vials which are sealed in polyethylene capsules. The capsules are propelled by compressed air at high speed through a 1-inch polyethylene tube. Equipment is provided for sealing and opening the polyethylene transfer capsules. The system has operated for 12 months, and 500 samples have been transferred successfully.
Date: January 1, 1979
Creator: Carpenter, J.A.
Partner: UNT Libraries Government Documents Department

Materials by design. A hierarchical approach to the design of new materials

Description: Major developments in materials characterization instrumentation over the past decade have helped significantly to elucidate complex processes and phenomena connected with the microstructure of materials and interfacial interactions. Equally remarkable advances in theoretical models and supercomputers also have been taking place during this period. These latter now permit, for example, in selected cases the computation of material structures, bonding and the prediction of some material properties. Two assessments of the state-of-the-art of instrumental techniques and theoretical methods for the study of material structures and properties have recently been conducted. This paper discusses aspects of computational theoretical methods applied to materials from these assessments. In addition, an approach is presented which uses advanced instrumentation and complementary theoretical computational techniques in tandem in an effort to construct and verify hierarchies of models to translate engineering materials performance requirements into microscopic and atomic level materials specifications (compositions, structure and bonding). Areas of practical interest include: catalysis, tribology (contacting surfaces in relative motion), protective coatings and metallurgical grain boundaries. A first attempt involving modeling of grain boundary adhesion in Ni/sub 3/Al is discussed.
Date: January 1, 1985
Creator: Eberhardt, J.J.; Hay, P.J. & Carpenter, J.A. Jr.
Partner: UNT Libraries Government Documents Department