869 research outputs found

    Aircraft energy efficiency laminar flow control wing design study

    Get PDF
    An engineering design study was performed in which laminar flow control (LFC) was integrated into the wing of a commercial passenger transport aircraft. A baseline aircraft configuration was selected and the wing geometry was defined. The LFC system, with suction slots, ducting, and suction pumps was integrated with the wing structure. The use of standard aluminum technology and advanced superplastic formed diffusion bonded titanium technology was evaluated. The results of the design study show that the LFC system can be integrated with the wing structure to provide a structurally and aerodynamically efficient wing for a commercial transport aircraft

    A New Paradigm: Entrepreneurial Leadership

    Get PDF
    Lloyd W. Fernald, Jr., D.B.A, is professor of management, Management Department, College of Business, Administration, University of Central FLorida, Orlando, FL 32817. George T. Solomon, D.B.A, is associate professor of entrepreneurship, The George Washington University, Washington, DC, 20052. Ayman Tarabishy, is a doctoral student, The George Washington University, Washington, DC 20052

    Three Able Addresses Delivered Before the State Board of Trade at Bangor, Maine, March 25, 1902

    Get PDF
    The text of three addresses: Maine canning industry / B.M. Fernald -- Maine as a vacation state / Leroy T. Carleton -- Maine primitive and modern industry / J.W. Penney

    New Technologies for Space Avionics, 1993

    Get PDF
    The report reviews a 1993 effort that investigated issues associated with the development of requirements, with the practice of concurrent engineering and with rapid prototyping, in the development of a next-generation Reaction Jet Drive Controller. This report details lessons learned, the current status of the prototype, and suggestions for future work. The report concludes with a discussion of the vision of future avionics architectures based on the principles associated with open architectures and integrated vehicle health management

    Functional mapping of the auditory midbrain during mate call reception

    Get PDF
    We examined patterns of neural activity as assayed by changes in gene expression to localize representation of acoustic mating signals in the auditory midbrain of frogs. We exposed wild-caught male Physalaemus pustulosus to conspecific mating calls that vary in their behavioral salience, nonsalient mating calls, or no sound. We measured expression of the immediate early gene egr-1 (also called ZENK, zif268, NGFI-A, and krox-24) throughout the torus semicircularis, the auditory midbrain homolog of the inferior colliculus. Differential egr-1 induction in response to the acoustic stimuli occurred in the laminar, midline, and principal nuclei of the torus semicircularis, whereas the ventral region did not show significant effects of stimulus. The laminar nucleus differentially responded to conspecific mating calls compared with nonsalient mating calls, whereas the midline and principal nuclei responded preferentially to one of two conspecific calls. These responses were not explained by simple acoustic properties of the stimuli, and they demonstrate a functional heterogeneity of auditory processing of complex biological signals within the frog midbrain. Moreover, using analyses that assess the ability of the torus semicircularis as a whole to discriminate among acoustic stimuli, we found that activity patterns in the four regions together provide more information about biologically relevant acoustic stimuli than activity in any single region
    corecore