some aerodynamic considerations related to wind tunnel model surface definition

the aerodynamic considerations related to model surface definition are examined with particular emphasis in areas of fabrication tolerances, model surface finish, and orifice induced pressure errors. the effect of model surface roughness texture on skin friction is also discussed. it is shown that at a given reynolds number, any roughness..

investigation of proposed process sequence for the array automated assembly task: phase ii. quarterly technical progress report for quarter ending december 29, 1979

a sulfur hexaflouride plasma etch was investigated as a possible surface treatment to improve the performance of the cell, the radiation technology infrared furnace was qualified for use in the process sequence, and work was initiated on junction clean up by laser scribing through the junction. an evaluation of the minority carrier diffus..

controlled cadmium telluride thin films for solar cell applications (emerging materials systems for solar cell applications). final technical report, april 9, 1979-april 8, 1980

after a brief review of the work done during the first three quarters, the work done during the last quarter is discussed in detail. in brief, cdte sputtered self-doped and indium-doped n-type layers on ni-film on glass have been investigated for film resistivity, contact resistance, hall mobility and schottky barrier diode characteristic..

ready pressure attachment for existing anti-g valves

an attachment for use with an anti-g valve to substantially decrease the inflation time of anti-g garment. a spring loaded, adjustable tension level arm provides a downward force on a pressure valve causing the anti-g garment to partially inflate. the increasing garment pressure is applied to a diaphragm which causes the lever arm to rise..

multivariable anti-g valve,

an anti-g valve and control system for providing a multivariable, multi-profile, pressurization of aircrew anti-g garments are disclosed. the ramp characteristic, the ramp onset level, a step onset, the step level, a limit pressure, are all controllable over the normal operating range. in addition, an optional ready pressure control is pr..

compatibility of aircraft operational fluids with a graphite/epoxy composite - development of an exterior coating system and remover

the objective of this investigation is the identification of aircraft operational and specialty chemical which are potentially detrimental to the integrity of organic matrix composites. in this report, results of several studies made with the graphite/epoxy hercules as/3501-6 are disclosed. several alternatives to the problem of paint rem..

maintenance and preservation of concrete structures. report 3 abrasion-erosion resistance of concrete

this report describes a laboratory test program on abrasion-erosion resistance of concrete, including the development of a new underwater abrasion-erosion test method. this program was designed to evaluate the relative abrasion-erosion resistance of various materials considered for use in the repair of erosion-damaged concrete structures...

project fires. volume 3: protective ensemble design and procurement specification, phase 1b

each of the subsystems comprising the protective ensemble for firefighters is described. these include: (1) the garment system which includes turnout gear, helmets, faceshields, coats, pants, gloves, and boots; (2) the self-contained breathing system; (3) the lighting system; and (4) the communication system. the design selection rational..

project fires. volume 4: prototype protective ensemble qualification test report, phase 1b

the qualification testing of a prototype firefighter's protective ensemble is documented. included are descriptions of the design requirements, the testing methods, and the test apparatus. the tests include measurements of individual subsystem characteristics in areas relating to both physical testing, such as heat, flame, impact penetrat..

project fires. volume 1: program overview and summary, phase 1b

overall performance requirements and evaluation methods for firefighters protective equipment were established and published as the protective ensemble performance standards (peps). current firefighters protective equipment was tested and evaluated against the peps requirements, and the preliminary design of a prototype protective ensembl..