10,146 research outputs found

    The Christian Academic Librarian in the Technological Society

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    In our contemporary society, technologies establish the course of our lives. Libraries have always engaged various technologies to bring order to disorder and over the last two decades, academic libraries have undergone significant technological change. Librarians have sought to convey an orderliness to the visible world and humanity’s body of knowledge. How this technology and body of knowledge is engaged bears significance. The engagement of the Christian academic librarian should include a distinctly Christian perspective. This paper examines the engagement of the Christian academic librarian in the technological society

    Study of roles of remote manipulator systems and EVA for shuttle mission support, volume 1

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    Alternate extravehicular activity (EVA) and remote manipulator system (RMS) configurations were examined for their relative effectiveness in performing an array of representative shuttle and payload support tasks. Initially a comprehensive analysis was performed of payload and shuttle support missions required to be conducted exterior to a pressurized inclosure. A set of task selection criteria was established, and study tasks were identified. The EVA and RMS modes were evaluated according to their applicability for each task and task condition. The results are summarized in tabular form, showing the modes which are chosen as most effective or as feasible for each task/condition. Conclusions concerning the requirements and recommendations for each mode are presented

    Development and validation of methods for man-made machine interface evaluation

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    The alternate methods of conducting a man-machine interface evaluation are classified as static and dynamic, and are evaluated. A dynamic evaluation tool is presented to provide for a determination of the effectiveness of the man-machine interface in terms of the sequence of operations (task and task sequences) and in terms of the physical characteristics of the interface. This dynamic checklist approach is recommended for shuttle and shuttle payload man-machine interface evaluations based on reduced preparation time, reduced data, and increased sensitivity of critical problems

    Consideration of radar target glint from ST during OMV rendezvous

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    The nature of radar target glint and the factors upon which it depends when using the Hubble Space Telescope as a radar target is discussed. An analysis of the glint problem using a 35 MHz or 94 MHz radar on the orbital maneuvering vehicle is explored. A strategy for overcoming glint is suggested

    Head-up displays - A study of their applicability in civil aviation

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    Benefits and problems of using head-up displays in commercial and general aviation aircraf

    Current status of computational methods for transonic unsteady aerodynamics and aeroelastic applications

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    The current status of computational methods for unsteady aerodynamics and aeroelasticity is reviewed. The key features of challenging aeroelastic applications are discussed in terms of the flowfield state: low-angle high speed flows and high-angle vortex-dominated flows. The critical role played by viscous effects in determining aeroelastic stability for conditions of incipient flow separation is stressed. The need for a variety of flow modeling tools, from linear formulations to implementations of the Navier-Stokes equations, is emphasized. Estimates of computer run times for flutter calculations using several computational methods are given. Applications of these methods for unsteady aerodynamic and transonic flutter calculations for airfoils, wings, and configurations are summarized. Finally, recommendations are made concerning future research directions

    Thermoelectric response of Fe1+y_{1+y}Te0.6_{0.6}Se0.4_{0.4}: evidence for strong correlation and low carrier density

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    We present a study of the Seebeck and Nernst coefficients of Fe1+y_{1+y}Te1x_{1-x}Sex_{x} extended up to 28 T. The large magnitude of the Seebeck coefficient in the optimally doped sample tracks a remarkably low normalized Fermi temperature, which, like other correlated superconductors, is only one order of magnitude larger than Tc_c. We combine our data with other experimentally measured coefficients of the system to extract a set of self-consistent parameters, which identify Fe1+y_{1+y}Te0.6_{0.6}Se0.4_{0.4} as a low-density correlated superconductor barely in the clean limit. The system is subject to strong superconducting fluctuations with a sizeable vortex Nernst signal in a wide temperature window.Comment: 4 pages including 4 figure

    Human operator performance of remotely controlled tasks: Teleoperator research conducted at NASA's George C. Marshal Space Flight Center

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    The capabilities within the teleoperator laboratories to perform remote and teleoperated investigations for a wide variety of applications are described. Three major teleoperator issues are addressed: the human operator, the remote control and effecting subsystems, and the human/machine system performance results for specific teleoperated tasks
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