Abstract:Commercial and military uses of RF/microwave anechoic chambers to conduct electromagnetic measurements of one type or another has increased considerably in recent years. unfortunately anechoic chambers can be very expensive to build ($0.5M for small chambers, to many $M for large chambers), and… more
Abstract:Development of a miniature solid state angular rate sensor is proposed. The proposed sensor is built on a silicon substrate using a three layered polysilicon sputtering process. The fabrication process employs the surface micromachining technology. The sensing element is flutter inertia suspended… more
Abstract:Modern manpack or hand held RF communication systems mandate an ultra compact and lightweight transceiver design complemented with a physically small antenna system with extraordinary RF bandwidth, high gain capability and omnidirectional radiation patterns. Also, it is desirable to be able to… more
Abstract:The military is in the process of developing programmable, multiband, multimode radios that provide multiple, simultaneous transmit and receive channels in the frequency range of 2 MHz to 2 GHz to support the digitization of the battlefield. New, advanced ultra-wideband antenna concepts, subsystems… more
Abstract:RESEARCHERS ARE DEVELOPING DIRECT MICROMECHANICAL SIMULATION TECHNIQUE TO MODEL DAMAGE ACCUMULATION IN COMPOSITE MATERIALS. COMPOSITE MATERIAL TECHNOLOGY ALLOWS THE ENGINEER TO TAILOR THE MATERIAL PROPERTIES FOR THE SPECIFIC DESIGN REQUIREMENTS OF A MECHANICAL SYSTEM, SUCH AS A PROPULSION SYSTEM.… more
Abstract:Current IR systems are extremely susceptible to electromagnetic and radio frequency interference (EMI/RFI) because they possess large apertures that present ideal front-door entry paths for EM radiation. Significant amounts of EM radiation (400 MHz - 18 GHz) can penetrate and couple to the IR… more
Abstract:In situ bioremediation would significantly reduce the costs and risks associatedwith the cleanup of chlorinated aliphatic hydrocarbon (CAH) solvent contaminationin the vadose zone and in groundwater. CAH remediation requires controlledaccess to the subsurface for delivery and mixing of a variety of… more
Abstract:Dense, high-performance electronic systems employ advanced substrate materials, such as ceramics, for maximum heat dissipation. During the fabrication of these ceramic packages various thick-film and thin-film materials are bonded to the substrate and subsequently serve as circuit paths and… more
Abstract:This project will advance the state of the art of ultrahigh-pressure (UHP) jet machining technology. Existing technology uses water as the working fluid that accelerates abrasive particles in high-velocity, highly coherent jets. Despite successful demonstration and industrial utilization of the… more
Abstract:The proposed study will evaluate the effectiveness of combining polishing and doping to reduce twin nucleation sites and to prevent twin boundary movement in sapphire to improve its thermal shock resistance. Doped and undoped single-crystal sapphire will be grown by the Czochralski method. The… more
Abstract:The development of an intelligent shearography optical inspection system with an innovative and robust excitation technique for detecting weak bonds, delamination, and disbonds in composite materials and structures is proposed. This development will be conducted with the collaboration of Sandia… more
Abstract:A one degree of freedom high-frequency aerodynamic bearing-balance will be developed for force, moment, and orientation measurements under non-steady-state flight conditions. A cylindrical bearing-balance three inches in diameter using displacement sensing will be considered as the best candidate… more
Abstract:41076 November 20, 1996
Quest Integrated, Inc.
Hard rock drilling is a difficult and expensive process that limits our ability to develop geothermal resources. This project will investigate methods of fatigue weakening the rock to increase the penetration… more
Abstract:Effective, 3 dimensional measurements of phenomena associated with coastal processes such as frontal mixing and tidal flow require spatially separated measurements of several physical and optical variables as well as determination of directional transport in the water column. Phase I work proposes… more
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