Wright-Patterson Air Force Base

About: Wright-Patterson Air Force Base is a other organization based out in Wright-Patterson AFB, Ohio, United States. It is known for research contribution in the topics: Laser & Microstructure. The organization has 5817 authors who have published 9157 publications receiving 292559 citations. The organization is also known as: Wright-Patterson AFB & FFO.

Photon counting passive 3D image sensing for automatic target recognition

Abstract: In this paper, we propose photon counting three-dimensional (3D) passive sensing and object recognition using integral imaging. The application of this approach to 3D automatic target recognition (ATR) is investigated using both linear and nonlinear matched filters. We find there is significant potential of the proposed system for 3D sensing and recognition with a low number of photons. The discrimination capability of the proposed system is quantified in terms of discrimination ratio, Fisher ratio, and receiver operating characteristic (ROC) curves. To the best of our knowledge, this is the first report on photon counting 3D passive sensing and ATR with integral imaging.

Microstructure and mechanical properties relationships in the Ti-11 alloy at room and elevated temperatures

Abstract: To establish correlations between microstructure and mechanical properties for the Till alloy, twelve different combinations of hot die forging and heat treatment, in the α+β and β phase regions, were investigated. The resulting heat treated forgings were classified into four distinct categories based on their microstructural appearance. The room temperature tensile, post-creep tensile, fracture toughness and fatigue crack propagation properties were measured along with creep and low cycle fatigue at 566°C. The creep, tensile, fatigue crack propagation and fracture toughness properties, grouped in a manner similar to the microstructural categories. The fracture appearance and behavior of the cracks during propagation in fatigue and in fracture toughness tests were examined, and correlations with the microstructure discussed. In the case of the fully transformed acicular microstructure, it was found that the size and the orientation of colonies of similarly aligned α needles are dominant factors in the crack behavior.

Testing a Subjective Metric of Situation Awareness

Abstract: The present research tested a subjective situation awareness (SA) metric, called the SA-SWORD technique. The SA-SWORD technique was an SA adaptation of a subjective workload assessment tool (called the Subjective WORkload Dominance (SWORD) technique). The utility of the SA-SWORD technique was tested in a simulator evaluation of cockpit displays, using Air Force pilots as subjects. Two displays were compared: the Fire Control Radar (FCR) display, and the Horizontal Situation Format (HSF) display. The FCR display provided a functional simulation of current air-to-air radar displays. The HSF was a map-like display that combined data-linked information from outside sources (e.g., an AWACS) with the aircraft's own data to provide a bird's-eye, symbolic view of the entire area. Following collection of the performance data, SA-SWORD scores were collected. Pilots rated their SA higher when using the HSF display, than when using the FCR display. An implication of the current results is that subjective SA metrics c...

Graphene oxide nanoribbon as hole extraction layer to enhance efficiency and stability of polymer solar cells.

Abstract: : Owing to its unique 2-dimensional carbon nanostructure with unique electrical, optical, thermal, and mechanical properties, graphene has attracted a great deal of interest. [ 1,2 ] While the pristine graphene is a zero-bandgap material with metal-like conductivity, graphene nanoribbon (GNR) is semiconducting with an opened bandgap induced by the quasi-one-dimensional confinement of charge carriers. [ 3 8 ] However, graphene and its nanoribbons without functionalization are insoluble and infusible. The poor processability has precluded the pristine graphene materials, including GNR, for various potential applications. This limitation has been circumvented by oxidizing graphene with acids (e.g., H 2 SO 4 /KMnO 4 ) to produce graphene oxide (GO) with oxygen-containing groups (e.g., COOH, OH) around and on the carbon basal plane, [ 2 ] leading to low-cost mass production of soluble graphene derivatives for potential applications. By introducing the oxygen-rich groups around a graphene nanoribbon, the resultant graphene oxide nanoribbon (GOR) should show a synergistic effect to have the bandgap of GNR and solution processability of GO. Therefore, GORs could be a new class of solution-processable semiconducting materials attractive for optoelectronic applications. In this study, we demonstrate, for the first time, that GOR can be used as an excellent hole-extraction material to significantly improve the performance of polymer solar cells (PSCs). PSCs using polymeric materials to convert solar energy to electricity is an emerging photovoltaic technology to compete with the widely used photovoltaic technologies based on inorganic materials. [ 9 ] In spite of many advantages (e.g., low cost, flexibility, and semi-transparency), the efficiency and lifetime of PSCs are still largely limited by, among other factors, the poor charge extraction from the active layer to electrodes.