Is proposed which will circumvent several of the limitationsof current linear position-sensitive detectors. the unique features of the proposed detector are: multiple anode wiresin a unique spacing arrangement which will distribute the space charge over a wider area and will lead to both longer… More

A research and development program is proposed in which an existing portable xray residual stress analysis system is modified and adapted for field use in a naval aircraft maintenance environment. in phase i,it is proposed: (1) to adapt the existing

A study is proposed to determine the feasibility of a new measurement system for determination of radioactive contamination in water under battlefield conditions. the proposed system has the advantages of an easy to use, lightweight, compact, and ruggedized monitoring system for direct measurement… More

Improvements are needed in the barrier index of electron emission from thermionic emitters at operating temperatures above 1400oc. directionally solidified (single crystal) metal oxide composites provide a unique opportunity to form high-packing density arrays of small metal fibers (1 x 106… More

A dual level temperature warning switch is to be designed, prototyped, and verified to meet technical specifications. the prototype dual level temperature warning switch will be designed in miniature, making it interchangeable with the current single level temperature warning switch specified in… More

A portable instrument, based on the principles of x-ray diffraction, is proposed which will allow quantitative determination of the presence of asbestos in materials of construction. preliminary tests show that a resolution of a few weight percent asbestos can be easily measured. analysisof the… More

A nondestructive technique is proposed for the on-line determination of grain size in polycrystalline materials. the method correlates fluctuations in intensity of x-rays diffracted from various crystallographic planes in the material to the grain size. through the use of position-sensitive x-ray… More

Beneficial residual stress concentrations in aircraft structures and systems are altered by service loading and temperature changes, and it is necessary to identify detrimental residual stresses. Life cycle costs are high because structural integrity andsafety concerns lead to reliance on overly… More

The Air Force identified measuring stresses in hard-to-access locations as a major concern. Detrimental stresses in these locations lead to expensive loss of use, inspection and repair costs, and potential loss of aircraft and personnel.X-Ray diffraction--a proven technique for measuring… More

The residual stresses that result from coldworking a hole, or using an interference-fit fastener, can significantly increase the life of a structure subjected to fatigue loading. Manufacturing practices cause variability in the effectiveness of cold-worked holes and interference-fit fasteners.… More