Bookmarks

Recent Publications and Patents by the Aerospace Technical Staff

Patents

J. C. Chai, "Lightning Effects Monitoring and Retest Evaluation Method," U.S. Patent No. 6,175,808, Jan. 2001.

This evaluation method determines when a lightning event warrants a costly retest of the target system. The technique also provides a hybrid on-line monitoring system that combines analog and digital technologies for monitoring lightning-induced electromagnetic transients, which can possibly damage the target system. Drawing upon prelaunch analyses involving essential coupling physics of lightning, system geometries, and correlated multisensor readings, this chain algorithm generates indices of monitored data and compares them to critical retest indices. The result of the comparison can then provide real-time retest recommendations following major lightning storms.

D. J. Chang, P. R. Valenzuela, and R. P. Wells, "Honeycomb Shear Testing Method," U.S. Patent No. 6,178,825, Jan. 2001.

This testing method can be used to determine mechanical shear properties—including shear-failure strength—of a honeycomb specimen. A filler material is injected under partial vacuum into the cells of the honeycomb, whose ends are then fastened between opposing fixtures. A load applied to one end of the specimen induces shear without introducing tension or compression forces. The test method produces consistent and reliable data on the mechanical properties of the honeycomb specimen.

R. C. Cole, R. E. Robertson, and A. D. Yarbrough, "Method of HF Vapor Release of Microstructures," U.S. Patent No. 6,238,580, May 2001.

This process applies to the manufacture of microelectromechanical systems (MEMS). Specifically, the invention describes a combination wet and vapor-phase chemical etching method for releasing a MEMS structure from a substrate. By dissolving a sacrificial layer positioned between the structure and the substrate, the component can be released without stiction. The sacrificial layer may be, for example, a silicon-dioxide layer having a field portion over which the MEMS does not extend and a support portion over which the MEMS does extend. The field portion of the sacrificial layer is quickly removed via conventional wet etching with hydrofluoric acid, followed by rinsing and drying. The support portion below the MEMS is then removed via conventional vapor-phase etching using a chemical solution greater than 45 percent hydrofluoric acid by weight. As a result, the MEMS structure is released from the substrate without the use of an aqueous based etchant in a completely dry fashion, thereby preventing damage.

A. A. Moulthrop, M. S. Muha, C. J. Clark, and C. P. Silva, "Baseband Time-Domain Waveform Measurement Method," U.S. Patent No. 6,211,663, Apr. 2001.

This technique relies on time-domain baseband to measure modulated microwave signals (which are typically used in communications systems). By converting microwave signals to baseband before measurement, this method achieves greater accuracy than techniques using direct measurement at the microwave frequency. A down-converting receiver is first characterized using a prior characterization method, and then the modulated microwave signal is applied to it; the response of the receiver is then removed, resulting in an accurate characterization of the modulated microwave signal. The technique can be used to verify communications system performance or to characterize communications devices and systems; it is particularly useful for measuring the input/output of nonlinear power amplifiers that use modulated microwave signals.

R. W. Postma and R. B. Pan, "Corrugated Slider-Washer Bearing," U.S. Patent No. 6,224,288, May 2001.

The purpose of this invention is to allow relative thermal expansion and contraction between a precision instrument and the mounting base plate. The instrument is attached by bolts through three or more such bearings between the instrument and the base plate, each bearing having mating corrugated grooves. The radial orientation of the lubricated grooves allows radial thermal expansion and contraction, but prevents angular misalignment caused by rotational motion, leaving the full strength of the mounting bolts to support the instrument.

R. W. Postma and R. B. Pan, "Clip-Flexure Slider-Washer Bearing," U.S. Patent No. 6,210,067, Apr. 2001.

The purpose of this invention is to allow relative thermal expansion and contraction between a precision instrument and the mounting base plate. The instrument is attached by bolts through three or more such bearings between the instrument and the base plate, each bearing functioning as a thin lubricated two-part sliding spacer. The two slider portions are guided by a metal clip flexure that only allows relative radial motion, thus preventing rotation and angular misalignment of the instrument.

A. M. Young, S. S. Osofsky, "Feed-Forward Linearized Traveling-Wave Tube," U.S. Patent No. 6,177,836, Jan. 2001.

This invention achieves efficient feed-forward linearization of the transfer function of a traveling-wave tube. A linearization voltage—derived at baseband from the instantaneous amplitude of the input signal—is used to control the cathode voltage, thereby inducing phase modulation to offset the normal amplitude-modulation to phase-modulation conversion distortion. The feed-forward linearization control helps to reduce distortion, and thus improves phase linearization over the operating range of the tube.

A. H. Zimmerman and M. V. Quinzio, "Adaptive Charging Method for Lithium-Ion Battery Cells," U.S. Patent No. 6,204,634, Mar. 2001.

This technique facilitates adaptive charging of batteries, especially lithium-ion and lithium-polymer cells with time-averaging and time-varying charge capacities. The charging and discharging algorithm determines overcharged, undercharged, normal, and degraded operating conditions; it then meters the correct amount of recharge into a battery cell by adjusting a recharge fraction parameter—the amount of charging divided by the amount of discharging over one charging cycle. This technique optimizes cycle life while maintaining the cell at a high state of charge.

A. H. Zimmerman, A. Prater, D. A. Smith and J. H. Matsumoto, "Zero-Gravity Simulator for Testing Battery Cells," U.S. Patent No. 6,218,843, Apr. 2001.

Developed primarily for testing nickel-hydrogen battery cells, a zero-gravity simulator rotates an electrolytic device to achieve a cumulative zero-gravity vector. The simulator has connections for monitoring the electrical performance of the device under test to predict how it will perform when deployed in space. By simulating zero gravity, the apparatus can assess the operation of battery cells containing both fluids and gases that can redistribute within the influence of Earth's gravitational field, thereby affecting performance. The system simulates zero gravity by time-averaging Earth's gravitational field to zero on a time scale consistent with the rate of movement of fluids within the device.

Publications

(November 2000–August 2001)

P. M. Adams and C. T. Hoskinson, "Phase Identification in Mixed-Oxide Capacitors Using Electron Backscatter Diffraction and X-Ray Diffraction," 58th Microscopy & Microanalysis Conference, Proceedings (Philadelphia, PA, Aug. 2000), Vol. 6, Suppl. 2, pp. 944–945.

R. J. Adams and S. Eslinger, "COTS-Based Systems: COTS Software Lessons Learned, Recommendations, and Conclusions," Proceedings, Ground System Architecture Workshop (GSAW) (The Aerospace Corporation, Feb. 23–25, 2000).

P. C. Anderson et al., "Statistical Patterns in X-ray and UV Auroral Emissions and Energetic Electron Precipitation," Journal of Geophysical Research, Vol. 106, No. A4, 5907–5911 (Apr. 2001).

P. C. Anderson and D. L. McKenzie, "Polar Cap X-ray and Electrons under Low-Density Solar Wind Conditions: Coordinated PIXIE and DMSP Observations on 11 May 1999," Geophysical Research Letters, Vol. 27, No. 24, 4021–4024 (Dec. 2000).

P. C. Anderson, Y. Zhang, and D. J. McEwen, "Polar Ionospheric Responses to Solar Wind IMF Changes," Annales Geophysicae, Vol. 18, 629 (2000).

G. Arnold et al., "The Space Technology Research Vehicle (STRV)-2 Program," SPIE Proceedings, Vol. 4136, No. 190, 36–47 (2000).

E. J. Beiting and J. E. Pollard, "Measurements of Xenon Ion Velocities of the SPT-140 Using Laser Induced Fluorescence," 3rd International Conference on Spacecraft Propulsion, Proceedings (Cannes, France, Oct. 10–13, 2000), pp. 897–900.

S. Ben-Shmuel, "Hydrocode Models for the Analysis of Multi-Layer Thermal Insulation Blankets as Hypervelocity Shields," 21st Space Simulation Conference—The Future of Space Simulation Testing in the 21st Century, Proceedings (Greenbelt, MD, NASA Goddard Space Flight Center, 2000), pp. 239–245.

I. D. Boyd and M. W. Crofton, "A Computational Study of Grid Erosion Through Ion Impact," 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Proceedings (Huntsville, AL, July 16–19, 2000).

A. Buckley, "Space Tourism—from Dream to Reality," 51st International Astronautical Congress, Proceedings (Rio de Janeiro, Brazil, Oct. 7, 2000), p. 7.

J. C. Camparo, "The 'Atomic Candle': Progress Towards a Smart Rubidium Atomic Clock," IEEE/EIA International Frequency Control Symposium, Proceedings (Kansas City, MO, June 7–9, 2000), pp. 700–706.

Y. C. Chan, J. C. Camparo, and R. P. Frueholz, "The Autonomous Detection of Clock Problems in Satellite Timekeeping Systems," 31st Annual Precise Time & Time Interval (PTTI) Systems & Applications Meeting, Proceedings (Washington, DC, 2000), pp. 111–117.

M. W. Chen et al., "Modeling the Quiet Time Inner Plasma Sheet Protons," Journal of Geophysical Research, Vol. 106, No. A4, 6161–6178 (Apr. 2001).

M. W. Chen et al., "Simulations of Storm Time Diffuse Aurora with Plasmasheet Electrons in Strong Pitch Angle Diffusion," Journal of Geophysical Research, Vol. 106, No. A2, 1873–1886 (Feb. 1, 2001).

J. G. Coffer and J. C. Camparo, "Long-Term Stability of a Rubidium Atomic Clock in Geosynchronous Orbit," 31st Annual Precise Time & Time Interval (PTTI) Systems & Applications Meeting, Proceedings (Washington, DC, 2000), pp. 65–69.

J. R. Copeland, "Overview of System Architectural Implications of Third-Party Liability and Government Indemnification for GPS Augmentation," Navigation, Vol.47, No. 1, 7–15 (2000).

J. Cox, C. C. Chao, P. W. Stephens, and L. F. Warner, "Optical Tracker and S-Band Ranging Utility for Accurate Orbit Determination and Prediction," Advances in the Astronautical Sciences, Vol. 105, 257–274 (2000).

S. H. Crain, S. LaLumondiere, W. R. Crain, K. B. Crawford, S. J. Hansel, R. Koga, and S. C. Moss, "Comparison of Flight and Ground Data for Radiation-Induced High Current States in the 68302 Microprocessor," IEEE Radiation Effects Data Workshop Record (2000), pp. 85–88.

M. W. Crofton, "The Feasibility of Hollow Cathode Ion Thrusters: A Preliminary Characterization," 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Proceedings (Huntsville, AL, July16–19, 2000).

M. W. Crofton et al., "Origins of Accelerator Grid Current - Analysis of T5 Grid Test Results," Journal of Propulsion and Power, Vol. 17, No. 1, 203–211 (Jan. 2001).

M. W. Crofton, T. A. Moore, et al., "Near-Field Measurement and Modeling Results for Flight-Type Arcjet—NH Molecule, Journal of Spacecraft and Rockets, Vol. 38, No. 1, 79–86 (Feb. 2001).

S. J. DiMaggio, Z. H. Duron, and S. Rubin, "Accelerometer Spiking under Cryogenic Conditions," Experimental Mechanics, Vol. 41, No. 2, 174–181 (June 2001).

S. J. DiMaggio, S. Rubin, and B. H. Sako, "Gear Fault Detection in Rocket Engine Turbomachinery," Journal of Propulsion and Power, Vol. 17, No. 2, 225–231 (Apr. 2001).

K. W. Dotson, "Transient Coupling of Launch Vehicle Bending Responses with Aerodynamic Flow State Variations," Journal of Spacecraft and Rockets, Vol. 38, No. 1, 97–104 (Feb. 2001).

K. W. Dotson, R. L. Baker, and B. H. Sako, "Semiempirical Analysis of Limit Cycle Oscillation from Transonic Flow-State Changes at Angle of Attack," 42nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and MLS Conference and Exhibit (Seattle, WA, Apr. 16–19, 2001), p. 15.

K. W. Dotson, J. M. Womack, et al., "Structural Dynamic Analysis of Solid Rocket Motor Resonant Burning," Journal of Propulsion and Power, Vol. 17, No. 2, 347–354 (Apr. 2001).

W. A. Engblom, M. A. Weaver, and E. D Ndefo, "Numerical Study of Vehicle/Pad Configuration Effects on Launch Ignition Transients," 39th AIAA, Aerospace Sciences Meeting and Exhibit, Proceedings (Reno, NV, Jan. 8–11, 2001), p. 16.

J. L. Emdee, "A Survey of Development Test Programs For Hydrogen Oxygen Rocket Engines," 39th AIAA, Aerospace Sciences Meeting and Exhibit, Proceedings (Reno, NV, Jan. 8–11, 2001), p. 17.

J. F. Fennell, J. Roeder, et al., "Ring-Current Enhancement Due to Substorm-Associated Inductive Electric Fields," Fifth Int'l Conference on Substorms, Proceedings (St. Petersburg, Russia, May 16–20, 2000), pp. 451-454.

D. F. Hall, "Long-Term Flight TQCM Measurements," 8th International Symposium on Materials in a Space Environment, Proceedings (Arcachon, France, June 5–9, 2000).

D. F. Hall et al., "MSX Contamination Environment During the Fourth Orbital Year," 39th AIAA, Aerospace Sciences Meeting and Exhibit, Proceedings (Reno, NV, Jan. 8–11, 2001), p. 8.

J. H. Hecht, D. L. McKenzie, A. B. Christensen, et al., "Simultaneous Observations of Lower Thermospheric Composition During Moderate Auroral Activity from Kangerlussuaq and Narsarsuaq, Greenland," Journal of Geophysical Research, Vol. 105, No. A12, 27,109–27,118 (Dec. 2000).

J. H. Hecht, R. L. Walterscheid, et al., "Climatology and Modeling of Quasi-Monochromatic Atmospheric Gravity Waves Observed Over Urbana, Illinois," Journal of Geophysical Research, Vol. 106, No. D6, 5181–5195 (Mar. 27, 2001).

H. Helvajian, P. D. Fuqua, W. W. Hansen, and S. W. Janson, "Laser Microprocessing for Nanosatellite Microthruster Applications," RIKEN Review, No. 32, 57–63 (Jan. 2001).

H. Helvajian, P. D. Fuqua, W. W. Hansen, and S. W. Janson, "Nanosatellites and MEMS Fabrication by Laser Microprocessing," Proceedings of the SPIE - The International Society for Optical Engineering Conference (Omiya, Japan, June 14–16, 2000), pp. 319–326.

K. C. Herr, E. R. Keim, et al., "Utilizing Thermal Infrared Spectra of Mars for Mission Planning," Concepts and Approaches for Mars Exploration, Part 1; Proceedings of the Workshop (Houston, TX, Lunar and Planetary Institute, 2000), pp. 174–175.

K. C. Herr, E. R. Keim, J. A. Hackwell, et al., "A Field Study of Thermal Infrared Spectral Signatures, with Implications for Studies of Mars," Concepts and Approaches for Mars Exploration, Part 1; Proceedings of the Workshop (Houston, TX, Lunar and Planetary Institute, 2000), pp. 176–177.

D. A. Hinkley and E. J. Simburger, "A Mechanical Deployment Structure for the PowerSphere Concept," 35th Intersociety Energy Conversion Engineering Conference (Las Vegas, NV, July, 2000), AIAA Paper 2000-2918.

D. A. Hinkley and E. J. Simburger, "A Multifunctional Flexure Hinge for Deploying Omnidirectional Solar Arrays," AIAA/ASME/ASCE/AHS/ ASC Structures, Structural Dynamics, and Materials Conference and Exhibit, 42nd (Seattle, WA, Apr. 16–19, 2001).

A. Jackson, R. Das, and T. Jackson, "Finding Answers to Space Industry's Top 10 Reliability Problems," Proceedings, International Symposium on Product Quality and Integrity (IEEE, Piscataway, NJ, 2001), pp. 333–338.

A. B. Jenkin, W. S. Campbell, M. E. Sorge, et al., "Orbital Debris Hazard Assessment Methodologies for Satellite Constellations," Journal of Spacecraft and Rockets, Vol. 38, No. 1, 120–125 (Feb. 2001).

J. H. Kasner, S. S. Shen, T. S. Wilkinson, et al.,"JPEG-2000 Compression Using 3-D Wavelets and KLT with Application to HYDICE Data," SPIE Proceedings, Vol. 4132, 157–166 (2000).

J. A. Kechichian, "The Efficient Computation of Transfer Trajectories between Earth Orbit and L(1) Halo Orbit Within the Framework of the Sun-Earth Restricted Circular Three Body Problem," Advances in the Astronautical Sciences, Vol. 105, 1159–1180 (2000).

R. Koga, S. H. Crain, K. B. Crawford, S. C. Moss, and S. LaLumondiere, "Single Event Transient (SET) Sensitivity of Radiation Hardened and COTS Voltage Comparators," IEEE Radiation Effects Data Workshop Record, 53–60 (2000).

R. Koga, S. H. Crain, K. B. Crawford, and P. Yu, "SEE Sensitivity Determination of High Density DRAM with Limited-Range Heavy Ions," IEEE Radiation Effects Data Workshop Record, 45–52 (2000).

M. A. Kwok and S. T. Amimoto, "Modeling HF Gain Generator F-Atom Flows," 31st AIAA Plasmadynamics and Lasers Conference (Denver, CO, June 19–22, 2000).

R. C. Lacoe, C. Mayer, et al., "Implications of Radiation-Induced Dopant Deactivation for npn Bipolar Junction Transistors," IEEE Transactions on Nuclear Science, Vol. 47, No. 6, Pt. 3, 2281–2288 (Dec. 2000).

R. C. Lacoe and D. C. Mayer, "Charge Separation Technique for Metal-Oxide Silicon Capacitors in the Presence of Hydrogen Deactivated Dopants," Journal of Applied Physics, Vol. 87, No. 11, 8206–8208 (June 1, 2000).

R. C. Lacoe, C. Ronald, J. V. Osborn, R. Koga, S. Brown, and D. C. Mayer, "Application of Hardness-by-Design Methodology to Radiation-Tolerant ASIC Technologies," IEEE Transactions on Nuclear Science, Vol. 47, No. 6, 2334–2341 (Dec. 2000).

T. J. Lang et al., "Average and Maximum Revisit Time Trade Studies for Satellite Constellations Using a Multiobjective Genetic Algorithm," Advances in the Astronautical Sciences, Vol. 105, 653–666 (2000).

J. R. Lince and P. P. Frantz, "Anisotropic Oxidation of MoS2 Crystallites Studied by Angle-Resolved X-Ray Photoelectron Spectroscopy," Tribology Letters, Vol. 9, No. 3–4, 211–218 (2000).

K. R. Lorentzen, J. B. Blake, et al., "Observations of Relativistic Electron Microbursts in Association with VLF Chorus," Journal of Geophysical Research, Vol. 106, No. A4, 6017–6027 (Apr. 1, 2001).

A. Mathur, T. M. Nguyen, and G. Goo, "Propagation Effects on the Wideband Gapfiller Communication Link," Proceedings 21st Century Military Communications (Los Angeles, CA, Oct. 22–25, 2000).

J. E. Mazur et al., "Solar Energetic Particles vs. Global Cosmic-Ray Diffusion," Acceleration and Transport of Energetic Particles Observed in the Heliosphere," American Institute of Physics (AIP) Conference Proceedings, No. 528 (2000), pp. 157–160.

S. L. Paige, "Designing a Solar Storm Microsatellite for Predicting Space Weather," 2000 IEEE Aerospace and Electronic Systems Society Conference Proceedings, Vol. 7 (Big Sky, MT, Mar. 18–25, 2000), pp. 223–233.

R. P. Petera, "A General Method for Calculating Satellite Collision Probability," Advances in the Astronautical Sciences, Vol. 105, 1275–1290 (2000).

E. L. Petersen and J. W. Murdock, "Coupling Between Internal Vortex Shedding and the Axial Acoustic Modes in a Choked Duct Flow: New Experiments," Proceedings of the ASME Fluids Engineering Division, Vol. FED-253 (2000), pp. 645–652.

E. L. Petersen and J. W. Murdock, "Secondary Injection in a Model Solid Rocket Motor for the Suppression of Vortex-Driven Instability," AIAA/ASME/SAE/ASEE 36th Joint Propulsion Conference (Huntsville, AL, July 16–19, 2000).

J. E. Pollard and E. J. Beiting, "Ion Energy, Ion Velocity, and Thrust Vector Measurements for the SPT-140 Hall Thruster," 3rd International Conference on Spacecraft Propulsion (Cannes, France, Oct. 10–13, 2000), ESA-SP-365, pp. 789–796.

T. D. Powell et al., "An On-Line Parameter Estimator for Quick Convergence and Time-Varying Linear Systems," IEEE Transactions on Automatic Control, Vol. 45, No. 10, 1854–1863 (Oct. 2000).

M. V. Quinzio, G. A. To, W. C. Hwang, M. L. Wasz, and N. Weber, "Sinter Corrosion During Long-Term Dry Storage of Nickel Cadmium Cells," 39th Power Sources Conference (Cherry Hill, NJ, June 12–15, 2000), pp. 378–381.

R. E. Robertson, P. M. Adams, R. C. Cole, D. A. Hinkley, and G. Radhakrishnan, "Investigation of the Deposition and Integration of Hard Coatings for Moving MEMS Applications," Material Resources Society Symposium Proceedings, Vol. 605 (2000), pp. 123–128.

J. L. Roeder, "Ring Current Activity During the Early B2<0 Phase of the January 1997 Magnetic Cloud," Journal of Geophysical Research, Vol. 104 (A11), 24,895–24,914 (Nov. 1, 1999).

G. S. Rossano, R. W. Russell, D. K. Lynch, T. K. Tessensohn, D. Warren, et al., "Observations of Leonid Meteors Using a Midwave Infrared Imaging Spectrograph," Earth, Moon, and Planets, Vol. 82, 83, No. 1–3, 81–92 (2000).

R. W. Russel, G. S. Rossano, M. A. Chatelain, D. K. Lynch, T. K. Tessensohn, E. Abendroth, K. Daryl, et al., "Mid-infrared Spectroscopy of Persistent Leonid Trains," Earth, Moon, and Planets, Vol. 82, 83, No. 1–3, 439–456 (2000).

R. S. Selesnick, "Solar Cycle Dependence of the Geomagnetically Trapped Anomalous Cosmic Rays," Geophysical Research Letters, Vol. 27, No. 15, 2349–2352 (Aug. 1, 2000).

B. Shaw, B. Thomas, et al., "High Resolution Cloud Analysis and Forecast System," 10th Conference on Satellite Meteorology and Oceanography (Long Beach, CA, Jan. 9–14, 2000); Preprints (Boston, MA, American Meteorological Society, 2000), pp. 114–117.

S. S. Shen, "Algorithms for Multispectral, Hyperspectral, and Ultraspectral Imagery VI," SPIE Proceedings, Vol. 4049, 544 (2000).

S. S. Shen and J. H. Kasner, "Effects of 3-D Wavelets and KLT Based JPEG-2000 Hyperspectral Compression on Exploitation," SPIE Proceedings, Vol. 4132, 167–176 (2000).

E. J. Simburger, J. Matsumoto, D. Hinkley, D. Gilmore, T. W. Giants, W. Thomas, and J. Ross, "Multifunctional Structures for the PowerSphere Concept," 42nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit (Seattle, WA, Apr. 16–19, 2001).

E. M. Sims et al., "The Department of Defense Space Test Program," SPIE Proceedings, Vol. 4136, 57–63 (2000).

W. K. Stuckey and M. J. Meshishnek, "Solar Ultraviolet and Space Radiation Effects on Inflatable Materials Gossamer Spacecraft: Membrane/Inflatable Structures Technology for Space Applications," AIAA Progress in Astronautics & Aeronautics, Vol. 191, 303–320 (2001).

W. K. Stuckey and M. J. Meshishnek, "Space Environment Stability of Tedlar with Multi-Layer Coatings: Space Simulation Testing Results," 8th International Symposium on Materials in a Space Environment Proceedings (Arcachon, France, June 5–9, 2000).

L. H. Thaller and A. H. Zimmerman, "Selecting Recharge Protocols for Deep-Discharge Nickel-Hydrogen Cells and Batteries," AIAA Collection of Technical Papers: 35th Intersociety Energy Conversion Engineering Conference and Exhibit, Vol. 2, 1073–1085 (2000).

J. C. Uht, G. S. Arnold, D. J. Coleman, and K. Luey, "Criteria for NVR Solvent Replacement," 4th Conference on Aerospace Materials, Process & Environmental Technology (Huntsville, AL, Aug. 20, 2000).

G. C. Valley, "Modeling Cladding-Pumped Er/Yb Fiber Amplifiers," Optical Fiber Technology, Vol. 7, 21–44 (2001).

R. L. Walterscheid et al., "Zonally Symmetric Oscillations Observed in the Airglow from South Pole Station," Journal of Geophysical Research, Vol. 106, No. A3, 3645–3654 (Mar. 2001).

R. L. Walterscheid and M. P. Hickey, "Secular Variation of OI 5577A Airglow in the Mesopause Region Induced by Transient Gravity Wave Packets," Geophysical Research Letters, Vol. 28, No. 4, 701–704 (Feb. 15, 2001).

R. L. Walterscheid, M. P. Hickey, and P. G. Richards, "Secular Variations of Atomic Oxygen in the Mesopause Region Induced by Transient Gravity Wave Packets," Geophysical Research Letters, Vol. 27, No. 21, 3599–3602 (Nov. 1, 2000).

R. L. Walterscheid, M. P. Hickey, and G. Schubert, "Gravity Wave Heating and Cooling in Jupiter's Thermosphere," Icarus, Vol. 148, 266–281 (2000).

R. L. Walterscheid and G. G. Sivjee, "Mesospheric and Lower Thermospheric Manifestations of a Stratospheric Warming Event Over Eureka, Canada (80 degrees N)," Geophysical Research Letters, Vol. 27, 2897–2900 (2000).

J. Wang-Ratkovic, E. E. King and R. C. Lacoe, "The Role of the Spacer Oxide in Determining Worst-Case Hot-Carrier Stress Conditions for NMOS LDD Devices," 38th Annual International Reliability Physics Symposium (San Jose, CA, 2000), pp. 83–92.

B. H. Weiller, P. D. Chaffee, D. G. Sutton, and N. Marquez, "Micromachined Chemical Sensors in Space: Result from the MNT Tested on STS-93," 30th International Conference on Environmental Systems (Toulouse, France, July 10–13, 2000).

C. H. Yinger, W. A. Feess, "Ionospheric Calibration for the Single-Frequency GPS User," Institute of Navigation 25th Anniversary World Conference (San Diego, CA, June 26, 2000).

To Summer 2001 Table of Contents