The proposed research seeks to define the most promising approaches leading to the development of an expert system for the solution of partial differential equations. phase i will establish the taxonomy of pde's which will be incorporated in the solver's knowledge base, and will study and define the… More

This research relates to the use of optimal systolic architectures for numerical solution of linear algebraic systems. solution of structured linear algebraic systems is fundamental to most nasa flow codes, arising from applying finite differencing to partial differential equations such as the… More

Two attributes of the current supercomputer milieu reveal an important national need addressed in this proposal: a) the known distribution of supercomputer resources in the america at other than university centers of excellence, and, b) the results of recent statistical analyses, disclosed in this… More

The generation of requirement analysis measures can be accomplished by the "expert system" approach. if a computer program is developed where the inputs of an experienced evaluation engineer can be stored a set of logical questions defined and a method for its progression (inference engine) then a… More

Advanced missile and reentry vehicle systems for which increased nuclear harness requirements will be imposed currently have no clear cut solution as to how they will sustain the increased requirements. volumetric, weight, and system performance constraints make "brut force" hardening design… More

The phase i program shall identify reentry vehicle aft cover designs that incorporate materials and design feature which offer increased hardness against nuclear effects while retaining low weight. program feasibility will be demonstrated by conduction of nuclear hardness and survivability (nh&s)… More

As aboveground test (agt) simulators are developed and enhanced, underground test (ugt) data is in most instances used as the yardstickto which the simulator capability to replicate nuclear weapons effects is measured. rather than replicate nuclear weapons effects such as material spallation,… More

The need to reduce weight in reentry vehicle (rv) designs has become a critical issue within the rv design community. as such, rv designers are looking to the use of high strength to weight ratio materials such as that offered by graphite epoxy as a replacement for those structural materials… More

Conventional nuclear hardening and survivability computer codes are currently implemented on large mainframe computer systems such as the cray, ibm, and the vax. transferring these codes to a personal computer could provide a much more efficient operating system environment in that simple energy… More

Hypersonic flight requires cooling of the leading edge of the airfoils and internal engine parts. this cooling can be provided by endothermic fuel reactions. methanol dissociation can provide more heat sink capacity than previously proposed reactions such as the dehydrogenation of methylcyclohexane.… More

The use of expert system technology to provide aid to novice air force personnel in the performance of their jobs is a natural outgrowth of both current expert system technology and the need for better computer-aided job assisting and job training. tdc has defined and developed a prototype… More

The use of methanol as a low emissions, alternate fuel to gasoline and diesel fuel may be limited by difficult cold starting and high co and unburned hydrocarbons during cold operation of methanol-fueled engines. a fueled vehicle to produce dimethyl ether and to meter the highly volatile dimethyl… More

The development of more competitive absorption refrigerationsystems could reduce primary energy use and energy costs andallow use of natural gas for cooling. absorption cycle efficiency approaches theoretical cycle limits, but the fluids used limit the range of operating temperatures and pressures.… More

Future missile systems will require improved structure/external protection materials in order to counter new and emerging threats. direct energy threats, including thermal or impulse lasers, particle beams, and kinetic energy weapons, are of particular importance. this program will identify integral… More

Disposal of demilitarized explosives is a growing environmental concern. the conversion of demilitarized explosives into a commercial explosive could provide a cost effective means of disposal while potentially reducing drilling costs by reducing the required size of boreholes. phase i proposes to… More

Current methods for attaching end closures to composite motorcases with full diameter openings most frequently utilize mechanial pin or key joints requiring additional weight at the joint area and expensive, time-consuming machining operations. more efficient methods of joining end closures to… More

Guardrail terminals are some of the more troublesome and potentially hazardous roadside appurtenances. recently developed terminal concepts which have passed current crash test criteria tend to be expensive and may require excessive length of need, flare-out space and additional fill and grading.… More

The federal aviation administration needs statistical data on the x-ray damage threshold of photographic film and magnetic media to predict possible damaging effect of higher powered x-ray facilities being considered as part of increased airport security. technology development associates, inc.… More

The Phase I program will identify several feasible rocket nozzle throat materials/design concepts. These concepts provide for extremely negligible throat erosion with acceptable wieght in tactical missile system, e.g. ADKEM, applications. The concept developmetn will consider both proven and… More

The proposed Phase I research program will develop an innovative filament wound composite case design for an annular rocket motor. Several design concepts for te motorcase and attachment interfaces iwll be developed which minimize the strain discontinuities present and address the large compressive… More

TECHNOLOGY DEVELOPMENT CORP. HAS DEMONSTRATED THAT A 1-METER-LONF GAIN MEDIA CO(2) LASER WHICH IS FOLDED INTO A CYLINDRICAL VOLUME THAT IS 15 CM IN DIAMETER x 5 CM HEIGHT CAN PRODUCE STABLE CW, MODE-LOCKED, AND Q-SWITCHED WAVEFORMS USEFUL FOR LASER, MULTIPLE- FOILED LASER (MFL) RADAR HAS A 7.5 KG… More

Utility poles present a serious roadside hazard due to the large number of poles located in close proximity to the roadways and the unforgiving nature of existing pole designs. Breakaway wooden utility poles have been developed over the past twenty years in an effort to improve utility pole safety,… More

Fiber optic sensors offer the potential for measuring strain and monitoring the cure cycle and service life of filament wound composite motorcases provided that successful methods for embedding the fiber optic sensors can be developed. The proposed Phase I research program will investigate… More

Filament wound composite structures are being increasingly used in tactical rocket motorcase applications to reduce weight and enhance system performance. Conventional fabrication methods for composite motorcase structures are time-consuming and often require expensive tooling. This Phase I Small… More

Noise reduction from large military aircraft is significant as airfields encroach on residential areas. Two methods of noise reduction are possible: active and passive. This proposal will outline a tunable, passive method that can stand alone or be usedin conjunction with active methods to reduce… More

Secondary fire detection in P&W 100 engines used on F-15 and F-16 aircraft are detected by a 1970's technology Light Off Detector (LOD). The LOD is bulky and heavy. They are also expensive and therefore repair kits must be purchased and personnel trained to maintain them. There are reliability… More