16 research outputs found
NPS Inducts Newest Member into Esteemed Hall of Fame
No full textNews Stories ArchiveThe Naval Postgraduate School (NPS) recently welcomed its newest inductee into the university’s prestigious Hall of Fame. Vice Adm. Jan E. Tighe was presented with the NPS Hall of Fame medal – honori..
Ultrasonic assessment of additive manufactured Ti-6Al-4V
No full textAdditive Manufacturing (AM) processes offer the potential for manufacturing cost savings and rapid insertion into service through production of near net shape components for complicated structures. Use of these parts in high reliability applications such as those in the aerospace industry will require nondestructive characterization methods to ensure post-process material quality in as-built condition. Ultrasonic methods can be used for this quality verification. Depending on the application, the service life of AM components can be sensitive to the part surface condition. The surface roughness and layered structure inherent to the electron-beam powder-bed fusion process necessitates new approaches to evaluate subsurface material integrity in its presence. Experimental methods and data analytics may improve the evaluation of as-built additively manufactured materials. This paper discusses the assessment of additively manufactured EBM Ti-6Al-4V panels using ultrasonic methods and the data analytics applied to evaluate material integrity. The assessment was done as an exploratory study as the discontinuities of interest in these test samples were not known when the measurements were performed. Water immersion ultrasonic techniques, including pulse-echo and through transmission with 10 MHz focused transducers, were used to explore the material integrity of as-built plates. Subsequent destructive mechanical tests of specimens extracted from the plates provided fracture locations indicating critical flaws. To further understand the effect of surface-roughness, an evaluation of ultrasonic response in the presence of as-built surfaces and with the surface removed was performed. The assessment of additive manufactured EBM Ti-6Al-4V panels with ultrasonic techniques indicated that ultrasonic energy was attenuated by the as-built surface roughness. In addition, feature detection was shown to be sensitive to experimental ultrasonic parameters and flaw morphology
Influence of germination time and temperature on the properties of rye malt and rye malt based worts
No full textThe effects of germination time and temperature on the quality of rye malt and worts derived thereof were investigated using Response Surface Methodology. Amylolytic and proteolytic enzyme activities were increased by long germination periods, while beta-glucanase activity was not influenced. Total and Soluble Nitrogen content were also not significantly affected by the variations in germination conditions. Free Amino Nitrogen (FAN) was found in higher amounts in worts prepared from rye malts with long germination times. Extract contents were higher in rye malt than in the control barley malt and could be increased by a favourable germination regime, while no such impact on wort fermentability was found. High wort viscosities could be significantly reduced by a long germination period at low temperatures, but were still unacceptably high. The same conditions favoured the development of endoxylanase activity. Arabinoxylan (AX) accumulated during the germination process and their extractability increased. The results suggest that longer germination periods resulted in an increased number of AX molecules with lower molecular mass. Optimal rye malt qualities within the limits of this study were found for a germination time of 144 h at 10 degrees C, which resulted in an acceptable FAN content and the lowest measured viscosity. (C) 2010 Elsevier Ltd. All rights reserved.sponsorship: Funding for this research was provided under the Irish National Development Plan, through the Food Institutional Research Measure, administered by the Department of Agriculture, Fisheries & Food, Ireland. (Food Institutional Research Measure)status: Publishe
Natural and intuitive multimodal dialogue for in-car applications: The SAMMIE system
No full textWe present SAMMIE, a laboratory demonstrator of an in-car showcase of a multimodal dialogue system developed in the TALK project 5 in cooperation between DFKI/USAAR/BOSCH/BMW, to show natural, intuitive mixed-initiative interaction, with particular emphasis on multimodal turn-planning and natural language generation. SAM-MIE currently supports speech-centered multimodal access for the driver to a MP3-player application including search and browsing, as well as composition and modification of playlists. Our approach to dialogue modeling is based on collaborative problem solving integrated with an extended Information State Update paradigm. A formal usability evaluation of a first baseline system of SAMMIE by naive users in a simulated environment yielded positive results, and the improved final version will be integrated into a BMW test car.
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No full textProject funded by the European Community under the Sixth Framework Programme for Research and Technological Development The deliverable identification sheet is to be found on the reverse of this page. Project ref. no. IST-507802 Project acronym TAL
