Oxygen Diffusion in Tungsten
INFORMATION concerning oxygen diffusion in tungsten is technologically valuable for many reasons. One such reason is its important role in the development of the structural properties of tungsten for high-temperature applications.
Diffusion of Oxygen in Tungsten and some other Transition Metals
Stringer and Rosenfield1 have recently calculated some activation energies for diffusion of oxygen in transition metals, which were not otherwise available. One of these metals was tungsten. In a plot of activation energy versus melting point of the solvent, the authors attempted to show that tungsten and other metals dissolving less than about 1 per cent oxygen lay on a straight line through the origin; while those metals dissolving more than about 1 per cent oxygen fell on a straight line, which did not pass through the origin and which had a small negative slope. The line through the origin was supposed to be indicative of a normal lattice distortion mechanism and the other line an ionization mechanism.
Developers of the hepatitis B vaccine.
air at VA facilities, one of the many pieces of unfinished business beyond those major issues that we discussed in our Commentary. We agree that all facilities where current and past military personnel serve and receive treatment should be 100% smoke-free and note the recent Institute of Medicine report Combating Tobacco in Military and Veteran Populations. The report, which was commissioned by the Department of Defense (DOD) in 2007, calls for the DOD to set a timeline to eliminate smoking on military installations. The report also recommends that the DOD stop selling tobacco products in military commissaries and exchanges, prohibit tobacco use anywhere on military installations, and treat tobacco use in the same way as other health-related behaviors, such as alcohol abuse and poor physical fitness. We join Matthews and the Institute of Medicine in urging the VA and the DOD to take more immediate steps to protect the health of the men and women who serve in the armed services, as well as the civilians (such as Dr Matthews) working to serve them.