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    Using Anomalous Along-Track Forces for Topex/Poseidon Ground Track Control

    Shapiro, B. / Bhat, R. / Frauenholz, R. | NTRS | 1993

    USGS and NASA Digital Imagery Product Characterization

    Zanoni, Vicki / Smith, Charles / Blonski, Slawomir | NTRS | 2004

    User Scientific Data Systems: Experience Report

    Dobinson, Elain R. | NTRS | 1992

    User Requirements for Space Station Freedom

    Phillips, R. W. / Statham, G. / Schmitz, M. C. et al. | NTRS | 1993

    Use of two magnetometers for magnetic field measurements on a spacecraft

    Behannon, K. W. / Lepping, R. P. / Ness, N. F. et al. | NTRS | 1970

    USE OF A SEALED SILVER CADMIUM BATTERY ON EXPLORER XII

    Apelt, A. O. / Hennigan, T. J. | NTRS | 1962

    Upper Stage Flight Experiment 10K Engine Design and Test Results

    Ross, R. / Morgan, D. / Crockett, D. et al. | NTRS | 2000

    Upper-Stage Flight Experiment

    Anderson, W. E. / Boxwell, R. / Crockett, D. V. et al. | NTRS | 1999

    Uplink Process for the TOPEX/Poseidon Earth Orbiter

    Gustavson, B. / Lever, S. / Picard, G. et al. | NTRS | 1994

    Update to Mars Coordinate Frame Definitions

    Roncoli, R. / Mase, R. | NTRS | 1999

    Update: San Andreas Fault experiment

    Christodoulidis, D. C. / Smith, D. E. | NTRS | 1984

    Update on Technology Development Plan for a Low Temperature Hybrid Mars Ascent Vehicle Concept

    Prince, Andrew / Oglesby, Britt / Story, George et al. | NTRS | 2018

    Updated Stagnation-Point Aeroheating Correlations for Mars Entry

    Thomas K West, IV / A M Brandis | NTRS | 2020

    Unsteady Validation of a Mean Flow Boundary Condition for Computational Aeroacoustics

    Hixon, R. / Zhen, F. / Nallasamy, M. et al. | NTRS | 2004

    Unmanned Aircraft Systems in the National Airspace System: A Formal Methods Perspective

    Munoz, Cesar A. / Dutle, Aaron / Narkawicz, Anthony et al. | NTRS | 2016

    Unlocking the Mystery of Columbia's Tragic Accident Through Materials Characterization

    Shah, Sandeep / Jerman, Gregory / Coston, James | NTRS | 2003

    Universal Payload Information Management

    Elmore, Ralph B. | NTRS | 2003

    Unique Design Aspects of Spacecraft for Planetary Missions

    Jones, R. M. / Ridenoure, R. W. | NTRS | 1994

    Unique Design Aspects of Small Spacecraft for Low Cost Planetary Missions

    Ridenoure, Rex W. / Penzo, Paul A. / Jones, Ross M. | NTRS | 1994

    Unique Challenges of Exploring Mercury From an Orbiter

    Gulkis, S. / Spilker, T. | NTRS | 1996

    Understanding the Manager of the Project Front-End

    Mulenburg, Gerald M. / Imprescia, Cliff | NTRS | 2000

    Understanding Columbia's Reentry Problems

    Paul, Thomas | NTRS | 2006

      Understanding Columbia's Reentry Problems

      Paul, Thomas H. | NTRS | 2004

    Uncertainty of Videogrammetric Techniques used for Aerodynamic Testing

    Burner, A. W. / Liu, Tianshu / DeLoach, Richard | NTRS | 2002

    Uncertainty Considerations for Ballistic Limit Equations

    Schonberg, W. P. / Evans, H. J. / Williamsen, J. E et al. | NTRS | 2005

    Ulysses

    Smith, E. J. / Marsden, R. G. | NTRS | 1996

    Ultrawideband Electromagnetic Interference to Aircraft Radios

    Ely, Jay J. / Fuller, Gerald L. / Shaver, Timothy W. | NTRS | 2002

    Ultrasonic Evaluation of Thermal Degradation in Adhesive Bonds

    Lih, S. / Mal, A. K. / Bar-Cohen, Y. | NTRS | 1994

    Ultrasonic Drilling and Coring

    Bar-Cohen, Yoseph | NTRS | 1998

    UltraSail - Ultra-Lightweight Solar Sail Concept

    Burton, Rodney L. / Coverstone, Victoria L. / Hargens-Rysanek, Jennifer et al. | NTRS | 2005