Bookmarks

Recent Publications and Patents by the Aerospace Technical Staff

Publications

P. M. Adams and G. Radhakrishnan, "Microstructure of Pulsed-Laser Deposited Titanium Carbide Thin Films Grown for Tribological Applications," Microscopy and Microanalysis Proceedings (Long Beach, CA, Aug. 5–9, 2001), Vol. 2, Supp. 2, pp. 1238–1239.

P. Anderson et al., "Multisatellite Observations of Rapid Subauroral Ion Drifts (SAID)," Journal of Geophysical Research A: Space Physics, Vol. 106, No. A12, pp. 29,585–29,599 (Dec. 2001).

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, pp. 5907–5911 (Apr. 2001).

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

J. M. Baer, V. J. Ang, and W. C. Hwang, "90-Ampere-Hour Nickel-Hydrogen Dependent Pressure Vessel (DPV) Low Earth Orbit (LEO) Life Test Evaluation," Proceedings of the 17th Annual Battery Conference on Applications and Advances (Long Beach, CA, Jan. 15–18, 2002), pp. 35–40.

D. N. Baker, C. A. Barth, K. E. Mankoff, S. G. Kanekal, S. M. Bailey, G. M. J. Mason, and J. E. Mazur, "Relationships Between Precipitating Auroral Zone Electrons and Lower Thermospheric Nitric Oxide Densities," Journal of Geophysical Research, Vol. 106, No. A11, pp. 24,465–24,480 (Nov. 1, 2001).

R. A. Basheer, S. Jodeh, and A. R. Hopkins, "Properties of Blends of Sulfonic Acids Doped Polyaniline and Polyester-Polyether Block Copolymer," Materials Research Innovations, Vol. 4, pp. 144–147 (2001).

E. J. Beiting and J. E. Pollard, "Electromagnetic Emissions from a BHT-200 Hall Thruster," 27th International Electric Propulsion Conference (Pasadena, CA, Oct. 15–19, 2001). IEPC Paper 01-342.

K. L. Bellman and C. Landauer, "Virtual Worlds as Meeting Places for Formal Systems," Applied Mathematics and Computation, Vol. 120, Nos. 1–3, pp. 165–173 (May 2001).

J. Betser, "The Challenge of Creating Productive Collaborating Information Assurance Communities via Internet Research and Standards," Proceedings of the 20th IEEE Symposium on Reliable Distributed Systems (New Orleans, LA, Oct. 2001), pp. 70–71.

J. Betser, A. Walther, M. Erlinger, T. Buchheim, B. Feinstein, G. Matthews, R. Pollock, and K. Levitt, "GlobalGuard: Creating the IETF-IDWG Intrusion Alert Protocol (IAP)," Proceedings of the DARPA Information Survivability Conference and Exposition II (Anaheim, CA, June 12–14, 2001), Vol. 1, pp. 22–34.

B. Blake et al., "The Evolution of the Anomalous Cosmic Ray Oxygen Spectra from 1995 to 1998—Ulysses Observations," Space Science Reviews, Vol. 97, Nos. 1–4, pp. 363–366 (July 2001).

J. Blake et al., "Lightning-Induced Energetic Electron Flux Enhancements in the Drift Loss Cone," Journal of Geophysical Research A: Space Physics, Vol. 106, No. A12, pp. 29,733– 29,744 (Dec. 2001).

J. B. Blake, J. E. Mazur, et al., "Solar-Proton Polar-Cap Intensity Structures as a Test of Magnetic Field Models," Validation of Magnetospheric Models: Proceedings of the Symposium of COSPAR Scientific Commission D (Warsaw, Poland, July 16–23, 2000), pp. 1753–1757.

I. D. Boyd and M. W. Crofton, "Grid Erosion Analysis of the T5 Ion Thruster," 37th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit (Salt Lake City, UT, July 8–11, 2001). AIAA Paper 2001–3781.

L. W. Brownlow, G. A. Dorn, and T. J. Mosher, "A Proposal for Detailed Mapping of Martian Aquifers Using Penetrators," Conference on the Geophysical Detection of Subsurface Water on Mars, Proceedings (Houston, TX, Aug. 6– 10, 2001).

J. Camparo, "Precision Measurements with an Atomic Candle," Proceedings of the 2001 IEEE International Frequency Control Symposium and PDA Exhibition (Seattle, WA, June 6–8, 2001), pp. 111–116.

L. A. Campbell, "Characteristic Values of the Jacobian Matrix and Global Invertibility," Annales Math. Polonci, Vol. 76, Nos. 1–2, pp. 11–20 (2001).

K. Chan, "Analytical Expressions for Computing Spacecraft Collision Probabilities," Proceedings of the 11th Annual AAS/AIAA Space Flight Mechanics Meeting (Santa Barbara, CA, Feb. 11–15, 2001), pp. 305–320. AAS Paper 01-119.

C. C. Chao, J. Cox, and R. Burns, "Ground Tracking and Control of GEO Cluster Satellites Using the Raven Telescope," Proceedings of the 11th Annual AAS/AIAA Space Flight Mechanics Meeting (Santa Barbara, CA, Feb. 11–15, 2001), pp. 901–912. AAS Paper 01-165.

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

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

J. G. Coffer, M. Anderson, and J. C. Camparo, "Collisional Dephasing and the Reduction of Laser Phase-Noise to Amplitude-Noise Conversion in a Resonant Atomic Vapor," Physical Review A: Atomic, Molecular, and Optical Physics, Vol. 65, No. 3, pp. 033807/1–9 (Mar. 2002).

S. H. Crain, J. E. Mazur, R. B. Katz, R. Koga, M. D. Looper, and K. R. Lorentzen, "Analog and Digital Single-Event Effects Experiments in Space," IEEE Transactions on Nuclear Science, Vol. 48, No. 6, pp. 1841–1848 (Dec. 2001).

M. W. Crofton, "New Laser Applications for Electric Propulsion," 27th International Electric Propulsion Conference (Pasadena, CA, Oct. 15–19, 2001). IEPC Paper 01-305.

M. W. Crofton and I. D. Boyd, "Origins of Accelerator Grid Current—Analysis of T5 Grid Test Results," Journal of Propulsion and Power, Vol. 17, No. 1, pp. 203–211 (Jan. 2001).

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

P. R. Dahl, "Dynamic Hysteresis Model Application to Stiction Type Problems," Advances in the Astronautical Sciences, Proceedings of the Annual AAS Rocky Mountain Guidance and Control Conference (Breckenridge, CO, Jan. 31–Feb. 4, 2001), pp. 95–111.

M. I. Desai, G. M. Mason, J. R. Dwyer, J. E. Mazur, C. W. Smith, and R. M. Skoug, "Acceleration of He-3 Nuclei at Interplanetary Shocks," Astrophysics Journal, Vol. 553, Nos. 1–2, pp. L89–L92 (May 20, 2001).

S. J. DiMaggio, Z. H. Duron, and S. Rubin, "Accelerometer Spiking Under Cryogenic Conditions," Experimental Mechanics, Vol. 41, No. 2, pp. 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, pp. 225–231 (Apr. 2001).

S. J. DiMaggio and B. H. Sako, "Basic System Identification for Condition Monitoring of Turbopumps (Rocket Engines)," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, March 10–17, 2001), p. 7-3200.

K. W. Dotson, "Transient Coupling of Launch Vehicle Bending Responses with Aerodynamic Flow State Variations," Journal of Spacecraft and Rockets, Vol. 38, No. 1, pp. 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 Materials Conference and Exhibit (Seattle, WA, Apr. 16–19, 2001). AIAA Paper 2001–1288.

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

P. Duggan, S. Sampson, R. Burnell, R. Koga, P. Yu, S. H. Crain, S. McEndree, J. Tausch, D. Sleeter, and D. Alexander, "Comparative Testing of ADSP-21020 Digital Signal Processors from Multiple Vendors," IEEE Radiation Effects Data Workshop Record (Vancouver, BC, July 16–20, 2001), pp. 19–25.

J. L. Emdee, "A Survey of Development Test Programs for Hydrogen Oxygen Rocket Engines," 39th AIAA, Aerospace Sciences Meeting and Exhibit (Reno, NV, Jan. 8–11, 2001). AIAA Paper 2001–0749.

J. L. Emdee, "A Survey of Development Test Programs for LOX/Kerosene Rocket Engines," 37th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit (Salt Lake City, UT, July 8–11, 2001). AIAA Paper 2001-3985.

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 (Reno, NV, Jan. 8–11, 2001). AIAA Paper 2001-0802.

F. Fatemi, K. M. Jones, H. Wang, I. Walmsley, and P. D. Lett, "Dynamics of Photoinduced Collisions of Cold Atoms Probed with Picosecond Laser Pulses," Physical Review A, Vol. 64, Paper 33421.

J. F. Fennell, J. Roeder, et al., "Ring Current Ion Composition During Solar Minimum and Rising Solar Activity—Polar/CAMMICE/MICS Results," Journal of Geophysical Research, Vol. 106, No. A9, pp. 19131–19147 (Sep. 2001).

S. Goldstein et al., "Computational Aspects of Transfer Trajectories to Halo Orbits," Journal of Guidance, Control, and Dynamics, Vol. 24, No. 4, pp. 796–804 (Aug. 2001).

C. W. Gray, "Star Tracker/IRU Attitude Determination Filters," Advances in the Astronautical Sciences, Proceedings of the Annual AAS Rocky Mountain Guidance and Control Conference (Breckenridge, CO, Jan. 31–Feb. 4, 2001), pp. 459–476.

D. F. Hall et al., "MSX Contamination Environment During the Fourth Orbital Year," 39th AIAA, Aerospace Sciences Meeting and Exhibit (Reno, NV, Jan. 8–11, 2001). AIAA Paper 2001–0096.

J. H. Hecht, R. L. Walterscheid, M. P. Hickey, and S. J. Franke, "Climatology and Modeling of Quasi-monochromatic Atmospheric Gravity Waves Observed over Urbana, Illinois," Journal of Geophysical Research, Vol. 106, No. D6, pp. 5181–5195 (Mar. 2001).

J. H. Hecht, R. L. Walterscheid, and R. A. Vincent, "Airglow Observations of Dynamical (Wind Shear-Induced) Instabilities over Adelaide, Australia, Associated with Atmospheric Gravity Waves," Journal of Geophysical Research, Vol. 106, No. D22, pp. 28,189–28,197 (Nov. 2001).

H. Helvajian, "3D Microengineering Via Laser Direct-Write Processing Approaches," chap. 14 in Direct-Write Technologies for Rapid Prototyping Applications (New York, Academic Press, 2002).

L. K. Herman, C. M. Heatwole, and G. M. Manke, "Attitude Determination for the STEX Spacecraft Using Virtual Gyros," Guidance and Control 2001: Proceedings of the Annual AAS Rocky Mountain Conference (Breckenridge, CO, Jan. 31–Feb. 4, 2001), pp. 113–132. AAS Paper 01-008.

K. C. Herr, "Thermal Infrared Spectral Band Detection Limits for Unidentified Surface Materials," Applied Optics, Vol. 40, No. 27, pp. 4852– 4862 (Sep. 20, 2001).

D. Hinkley and E. J. Simburger, "A Multifunctional Flexure Hinge for Deploying Omnidirectional Solar Arrays," 42nd AIAA/ASME/ ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit (Seattle, WA, Apr. 16–19, 2001). AIAA Paper 2001-1260.

A. Jackson, R. Das, and T. Jackson, "Finding Answers to Space Industry's Top 10 Reliability Problems," Annual Reliability and Maintainability Symposium 2001 Proceedings: International Symposium on Product Quality and Integrity (Philadelphia, PA, Jan. 22–25, 2001), pp. 333–338.

S. W. Janson, "Nanotechnology—Tools for the Satellite World," 6th ISU Annual International Symposium: Smaller Satellites, Bigger Business? (Strasbourg, France, May 21–23, 2001).

A. B. Jenkin and R. A. Gick, "Analysis of the Collision Risk Associated with GPS Disposal Orbit Instability," Proceedings of the 11th Annual AAS/AIAA Space Flight Mechanics Meeting (Santa Barbara, CA, Feb. 11–15, 2001), pp. 223–242. AAS Paper 01-115.

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

H. A. Katzman, O. O. Esquivel, J. Calder, and B. Sullivan, "Infrared Thermal Imaging During Simulation of Electronic Thermal Plane Performance," 25th Annual Conference on Composites, Materials, and Structures (Cocoa Beach, FL, Jan. 22–26, 2001).

D. E. Keenan, "A Formation Flying Strategy for CloudSat/Picasso-Cena," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, March 10–17, 2001), pp. 2/535–552.

J. Knauf, L. Drake, and P. Portanova, "Evolved Expendable Launch Vehicle System—The Next Step in Affordable Space Transportation," 52nd International Astronautical Congress (Toulouse, France, Oct. 1–5, 2001). IAF Paper 01-V104.

R. Koga, S. H. Crain, P. Yu, and K. B. Crawford, "SEE Sensitivity Determination of High-Density DRAMs with Limited-Range Heavy Ions," 2001 IEEE Radiation Effects Data Workshop and IEEE Nuclear and Space Radiation Effects Conference, Workshop Record (Vancouver, BC, July 16–20, 2001), pp. 182–189.

R. Koga, P. Yu, K. B. Crawford, S. H. Crain, and V. T. Tran, "Permanent Single Event Functional Interrupts (SEFIs) in 128- and 256-Megabit Synchronous Dynamic Random Access Memories (SDRAMs)," 2001 IEEE Radiation Effects Data Workshop and IEEE Nuclear and Space Radiation Effects Conference, Workshop Record (Vancouver, BC, July 16–20, 2001), pp. 6–13.

R. C. Lacoe, J. V. Osborn, D. C. Mayer, S. Brown, and J. Gambles, "Total-Dose Tolerance of the Commercial Taiwan Semiconductor Manufacturing Company (TSMC) 0.35-µm CMOS Process," 2001 IEEE Radiation Effects Data Workshop and IEEE Nuclear and Space Radiation Effects Conference, Workshop Record (Vancouver, BC, July 16–20, 2001), pp. 72–76.

C. Landauer, "Simulation Spectrum and Stability Models," Proceedings of the 35th Annual Hawaii International Conference on System Sciences (Hawaii, HI, Jan. 7–10, 2002), pp. 1559–1568.

C. Landauer and K. L. Bellman, "Computational Infrastructure for Experiments in Cognitive Leverage," Cognitive Technology: Instruments of Mind, 4th International Conference, Proceedings (Coventry, UK, Aug. 6–9, 2001), pp. 490–519.

C. Landauer and K. L. Bellman, "Modeling Current Events," Proceedings of the 35th Annual Hawaii International Conference on System Sciences (Hawaii, HI, Jan. 7–10, 2002), pp. 1503–1512.

C. Landauer and K. L. Bellman, "Wrappings for One-of-a-Kind Software Development," Proceedings of the 35th Annual Hawaii International Conference on System Sciences (Hawaii, HI, Jan. 7–10, 2002), pp. 3987–3995.

C. Lee, E. Coe, J. M. Clark, J. Stepanek, C. Raghavendra, and K. Bellman, "Time Management in Active Networks," Proceedings Third Annual International Workshop on Active Middleware Services (San Francisco, CA, Aug. 6, 2001), pp. 51–64.

M. S. Leung and G. W. Stupian, "Magnetic Properties of Fe Microstructures with Focused Ion Beam-Fabrication Nano-Constructions," IEEE Transactions on Magnetics, Vol. 37, No. 4, pp. 2101–2103 (July 2001).

N. S. Lewis and A. R. Hopkins, "Detection and Classification Characteristics of Arrays of Carbon Black/Organic Polymer Composite Chemiresistive Vapor Detectors for the Nerve Agent Simulants DMMP and DIMP," Analytical Chemistry, Vol. 73, No. 5, pp. 884–892 (Mar. 1, 2001).

J. R. Lince and P. P. Frantz, "Anisotropic Oxidation of MoS₂ Crystallites Studied by Angle-Resolved X-ray Photoelectron Spectroscopy," Tribology Letters, Vol. 9, Nos. 3–4, pp. 211–218 (2001).

S. Lindsey and C. S. Raghavendra, "Energy Efficient Broadcasting for Situation Awareness in Ad Hoc Networks," Proceedings International Conference on Parallel Processing (Valencia, Spain, Sep. 3–7, 2001), pp. 149–155.

K. R. Lorentzen, J. B. Blake, U. S. Inan, and J. Bortnik, "Observations of Relativistic Electron Microbursts in Association with VLF Chorus," Journal of Geophysical Research, Vol. 106, No. A4, pp. 6017–6027 (April 2001).

D. K. Lynch, R. J. Rudy, C. C. Venturini, S. Mazuk, and R.C. Puetter, "Near-Infrared (0.8–2.5 micron) Spectroscopy of Nova Sagittarius1998 = V4633 Sagittarii," Astronomical Journal, Vol. 122, No. 4, pp. 2013–2016.

D. K. Lynch, R. W. Russell, and M. L. Sitko, "3–14 Micron Spectroscopy of Nova V445 Puppis," Astronomical Journal, Vol. 122, No. 6, pp. 3313–3316 (Dec. 2001).

A. Mathur, T. M. Nguyen, and G. Goo, "Rain Attenuation Model Assessment for Wideband Gapfiller Satellite Communications Link," MILCOM 2001 Conference Proceedings (Tysons Corner, VA, Oct. 28–31, 2001).

J. E. Mazur, G. M. Mason, and R. A. Mewaldt, "Charge States of Energetic Particles from Corotating Interaction Regions as Constraints on Their Source," Astrophysical Journal, Vol. 566, No. 1, pp. 555–561 (Feb. 10, 2002).

H. H. Nguyen and T. M. Nguyen, "Beamforming When Direction of Arrival is Random with Applications to Space Diversity Processing," ICC 2001: IEEE International Conference on Communications Conference Record (Helsinki, Finland, June 11–14, 2001), pp. 2620–2624.

T. M. Nguyen and C. C. Wang, "On the Link Budget Calculation for CDMA Systems," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, Mar. 10–17, 2001), pp. 2/909–913.

J. R. Nolan, "Comparison of Commercial High-Resolution Satellite Imagery," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, Mar. 10–17, 2001), pp. 2/925–930.

T. W. Nuteson and G. S. Mitchell, "Digital Beamforming for Smart Antennas," 2001 IEEE MTT-S International Microwave Symposium Digest (Phoenix, AZ, May 20–25, 2001), Vol. 1, pp. 125–128.

N. Ogamba, "Effectiveness of Analysis of Electrical Test Data of Defective Ceramic Capacitors," 21st Capacitor and Resistor Technology Symposium (St. Petersburg, FL, Mar. 2001), pp. 226–230.

R. P. Patera, "A Method for Calculating Collision Probability Between a Satellite and a Space Tether," Proceedings of the 11th Annual AAS/ AIAA Space Flight Mechanics Meeting (Santa Barbara, CA, Feb. 11–15, 2001), pp. 243–258. AAS Paper 01-116.

R. P. Patera, "General Method for Calculating Satellite Collision Probability," Journal of Guidance, Control, and Dynamics, Vol. 24, No. 4, pp. 716–722 (Aug. 2001).

E. L. Petersen, R. P. Welle, M. J., Traum, E. D. Abbey, and M. Rickard, "A New Shock-Tube Facility for Studying Combustion Phenomena in Mixtures Containing Condensed Species," 35th National Heat Transfer Conference (Anaheim, CA, June 10–12, 2001).

G. E. Peterson, R. G. Gist, and D. L. Oltrogge, "Covariance Generation for Space Objects Using Public Data," Proceedings of the 11th Annual AAS/AIAA Space Flight Mechanics Meeting (Santa Barbara, CA, Feb. 11–15, 2001), pp. 201–214. AAS Paper 01-113.

A. Quan, R. Crawford, H. Shao, K. Knudtzon, A. Schuler, D. Scott, S. Hayati, R. Higginbotham Jr., and R. Abbott, "Automated Threat Response Using Intelligent Agents (ATRIA)," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, Mar. 10–17, 2001), pp. 2721–2730.

M. V. Quinzio, G. To, and A. H. Zimmerman, "Scanning Porosimetry for Characterization of Porous Electrode Structures," Proceedings of the 17th Annual Battery Conference on Applications and Advances (Long Beach, CA, Jan. 15–18, 2002), pp. 291–295.

M. V. Quinzio and A. H. Zimmerman, "Dynamic Calorimetry for Thermal Characterization of Battery Cells," Proceedings of the 17th Annual Battery Conference on Applications and Advances (Long Beach, CA, Jan. 15–18, 2002), pp. 279–284.

T. S. Rose, D. Gunn, and G. C. Valley, "Gamma and Proton Radiation Effects in Erbium-Doped Fiber Amplifiers: Active and Passive Measurements," Journal of Lightwave Technology, Vol. 19, No. 12, pp. 1918–1923 (Dec. 2001).

R. J. Rudy, D. K. Lynch, S. Mazuk, C. C. Venturini, R. C. Puetter, and F. Hamann, "Markarian 478: a Second Seyfert Galaxy with 1 Micron Fe II Emission Lines," Publications of the Astronomical Society of the Pacific, Vol. 113, No. 786, pp. 916–919 (Aug. 2001).

R. J. Rudy, D. K. Lynch, S. Mazuk, C. C. Venturini, R. C. Puetter, and P. Hoflich, "Early-Time Infrared Spectra of the Type Ia Supernova 2000cx," Astrophysical Journal, Vol. 565, No. 1, pp. 413–418.

L. W. Schumann and T. S. Lomheim, "Infrared Hyperspectral Imaging Fourier Transform and Dispersive Spectrometers—Comparison of Signal-to-Noise-Based Performance," Imaging Spectrometry VII, Proceedings of the Conference (San Diego, CA, Aug. 1–3, 2001), pp. 1–14.

R. Selesnick et al., "Mapping Jupiter's Outer Radiation Belt," Journal of Geophysical Research A: Space Physics, Vol. 106, No. A12, pp. 29,859–29,869 (Dec. 2001).

R. S. Selesnick, "Simulation of the Anomalous Cosmic Ray Radiation Belt with Atmospheric Production and Decay," Geophysical Research Letters, Vol. 28, No. 17, pp. 3417–3420.

R. S. Selesnick, C. M. S. Cohen, and K. K. Khurana, "Energetic Ion Dynamics in Jupiter's Plasma Sheet," Journal of Geophysical Research, Vol. 106, No. A9, pp. 18,895–18,905.

S. S. Shen et al., "New Hyperspectral Compression Options in JPEG-2000 and Their Effects on Exploitation," Imaging Spectrometry VII; Proceedings of the Conference (San Diego, CA, Aug. 1–3, 2001), pp. 154–165.

C. P. Silva, A. A. Moulthrop, M. S. Muha, and C. J. Clark, "Application of Polyspectral Techniques to Nonlinear Modeling and Compensation," 2001 IEEE MTT-S International Microwave Symposium Digest (Phoenix, AZ, May 20–25, 2001), Vol. 1, pp. 13–16.

E. J. Simburger, J. Matsumoto, D. Hinkley, D. Gilmore, T. W. Giants, 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). AIAA Paper 2001–1343.

K. Siri and K. A. Conner, "Parallel-Connected Converters with Maximum Power Tracking," Proceedings of APEC 2002: 17th Annual IEEE Applied Power Electronics Conference and Exposition (Dallas, TX, Mar. 10–14, 2002), Vol. 1, pp. 419–425.

G. W. Stupian, N. Ives, N. Marquez, and B. A. Morgan, "Application of Lead Isotope Analysis to Bullet Individualization in Two Homicides," Journal of Forensic Science, pp. 1342–1351 (Nov. 2001).

T. Swan-Wood, J. G. Coffer, and J. C. Camparo, "Precision Measurements of Absorption and Refractive-Index Using an Atomic Candle," IEEE Transactions on Instrumentation and Measurement, Vol. 50, No. 5, pp. 1229–1233 (Oct. 2001).

S. R. Turner, "Active Browsing," Proceedings of the IASTED International Conference Internet and Multimedia Systems and Applications (Honolulu, HI, Aug. 13–16, 2001), pp. 181–186.

G. C. Valley, "Modeling Cladding-Pumped Er/Yb Fiber Amplifiers," Optical Fiber Technology: Materials, Devices and Systems, Vol. 7, No. 1, pp. 21–44 (Jan. 2001).

R. L. Walterscheid, "Gravity Wave Transports and Their Effects on the Large-Scale Circulation of the Upper Mesosphere and Lower Thermosphere," Advances in Space Research, Vol. 27, No. 10, pp. 1713–1721 (May 2001).

R. L. Walterscheid and M. Hickey, "One-Gas Models With Height-Dependent Mean Molecular Weight—Effects on Gravity Wave Propagation (Thermosphere Models)," Journal of Geophysical Research. A. Space Physics, Vol. 106, No. A12, pp. 28,831–28,839 (Dec. 2001).

R. L. Walterscheid, G. Schubert, and D. G. Brinkman, "Small-Scale Gravity Waves in the Upper Mesosphere and Lower Thermosphere Generated by Deep Tropical Convection," Journal of Geophysical Research D: Atmospheres, Vol. 106, No. D23, pp. 31,825–31,835 (Dec. 16, 2001).

H. G. Yeh, C. C. Wang, and A. H. Yamada, "Performance of the FFT-Based SDPSK Receiver in Fading Channels," 2001 IEEE Aerospace Conference Proceedings (Big Sky, MT, Mar. 10–17, 2001), pp. 3/1385–1389.

R. J. Zaldivar, R. W. Kobayashi, and T. J. Dickinson, "Exposure of Polycyanurate and Epoxy Matrix Composites to Hypergolic Rocket Fuel Components," Journal of Spacecraft and Rockets, Vol. 39, No. 1, pp. 99–105 (Jan. 2001).

Patents

S. J. Curry, D. M. Schwartz, J. F. Collins, "Convolutional Despreading Method for Rapid Code Phase Determination of Chipping Codes of Spread Spectrum Systems," U.S. Patent No. 6,345,073, Feb. 2002.

This signal-processing technique is designed for use in radio communication systems that employ chip-spreading codes and that therefore require code-phase determination for rapid acquisition of direct-sequence spread-spectrum signals. Taking advantage of the algebraic structure of the spreading code, this despreading method applies convolutional decoding to received signal-chip symbols. Modeled reduced-state structures with branchword transitions reduce metric computations while providing additional constraints for modifying convolutional sequential metric searches. These features improve the speed of code-phase determination. The method works best with a modified convolutional sequential search algorithm, such as a modified Fano Tree or Viterbi trellis convolutional sequential search. The method can also directly determine a modulated data stream, when present, to provide demodulated data without necessarily performing conventional cross-correlation despreading.

M. M. Gorlick, "Wearable Electronics Conductive Garment Strap and System," U.S. Patent No. 6,350,129, Feb. 2002.

An electrically conductive strap can communicate power and signals between batteries and electronic devices attached to it. The strap can be embedded in blouses, pants, belts, and similar articles of clothing, allowing personal electronic devices to be comfortably worn. Ordinary conductive snaps made from common materials provide reliable connection between the strap and the electronic devices. The strap is made of woven materials such as a conductive webbing that incorporates at least two durable electrical conductors directly into the conductive strap.

G. F. Hawkins, E. C. Johnson, J. P. Nokes, "Wheeled Large Surface Thermographic Inspection Heating Apparatus with Uniform Heating," U.S. Patent No. 6,400,898, June 2002.

Designed for thermographic inspection of large structures, a heater radiates a uniform amount of heat upon a large surface in a short period of time. The surface can then be imaged by a handheld infrared camera for quick detection of subsurface flaws. Easy to manipulate, the portable device is well suited for inspecting composite-overwrapped concrete bridges and buildings where debonding of the composite-concrete interface is a concern. Motor-controlled wheels translate an array of several equally spaced heating elements at a constant rate. The highly uniform heating eliminates the need for postprocessing of the data and enables the operator to detect flaws or defects at the time of inspection. The handheld equipment can be used in various sites without the difficult and lengthy setup associated with other types of heating equipment.

T. M. Nguyen, J. Yoh, A. S. Parker, D. M. Johnson, "High Power Amplifier Linearization Method Using Modified Linear-Log Model Predistortion," U.S. Patent No. 6,307,435, Oct. 2001.

Using a modified linear-log model, this predistortion technique linearizes the output of high-power amplifiers used in digital communication systems. The technique is specifically intended for nonlinear high-power amplifiers that suffer distortion when converting an amplitude-modulated input signal to a phase-modulated or amplitude-modulated output signal. A complex baseband linearizer provides predistortion at baseband, thereby reducing spectral regrowth and improving bit-error performance. The predistortion effects are matched to the amplifier distortions to cancel them out. The modified linear-log model reduces the clipping effects through the peak operating point for a specified output-power loss with minimum distortion.

E. J. Simburger, "PowerSphere Deployment Method," U.S. Patent No. 6,318,674, Nov. 2001.

This patent describes a method of deploying multiple flat panels interconnected by rotating hinges to achieve a predetermined curved shape, such as a sphere. The method is primarily intended to create a spherical enclosure known as a PowerSphere for use as an attitude-insensitive solar panel on a miniature satellite; however, the technique can also be used to create any similarly curved structure—for example, a curved geodetic tent for terrestrial use. Internal supporting struts and interconnecting panel frames and hinges are inflated during unfurling to automatically form the curved surface.

E. J. Simburger, A. Prater, P. J. Carian, "Power Distribution System," U.S. Patent No. 6,396,167, May 2002.

Particularly useful for microsatellites and nanosatellites, a power-distribution system delivers energy from multiple dc power sources and storage devices (such as solar cells and batteries) connected in parallel to a regulated power bus. The parallel connection is accomplished through microelectronic dc-dc regulators attached to each individual cell or battery, eliminating the need for serial connections. When total power from power sources exceeds system needs, the excess current is used to charge the dc storage devices. The regulators will continue to provide sufficient coupled power to the bus even if one or more of the power sources or storage devices fails. When used in conjunction with a spherical solar-cell array, the power-distribution system can ensure adequate electrical power to a satellite regardless of its orientation toward the sun.

K. Siri, "Maximum Power Tracking Solar Power System," U.S. Patent No. 6,369,462, Apr. 2002.

This power-tracking system ensures the delivery of maximum power from a source (such as a solar-cell array) to a load (such as a satellite payload). The system determines a proper control direction toward the source maximum-power point in one out of three possible controlling states: increasing, decreasing, or steady. These states are controlled by an array-voltage set-point command modulated by a dither signal, enabling regular power tracking (or system output voltage regulation) when load-demand is below the source peak power and maximum power tracking (or system solar array voltage regulation) when load-demand is above the source peak power. The system can deliver power to constant or pulsating loads and storage cells. When configured for a constant-power or pulsating load, the system uses both damped input-filter and damped output-filter capacitors or bus stabilizers coupled across the input and the load, respectively, to stabilize the input and output voltages around the selected dither frequency. At frequencies above the center frequency of the bus stabilizers, the system creates sufficient damping effects to ensure both input and output voltage stability without undesirable oscillation. The maximum-power tracking system can support existing commercial-off-the-shelf dc-dc converters that use current-mode control in an innermost control loop. Multiple sets of paralleled converters and their respective maximum power trackers can be distributively connected to their respective array sources while their converter outputs are coupled in parallel using shared bus control signals for fault-tolerant equalized power conversion.

A. M. Young, S. S. Osofsky, "Active Feedback Pulsed Measurement Method," U.S. Patent No. 6,396,298, May 2002.

This active feedback circuit minimizes voltage transients during pulsed measurements of a semiconductor device such as a high-power field-effect transistor (FET). The method uses three bias tees: an input-gate bias tee for applying an accurately shaped pulsed input; a sensing bias tee for sensing terminal voltages (such as drain voltages for an FET); and a drive bias tee for coupling in a feedback signal from an active feedback circuit. The feedback circuit receives an ac coupled input-error signal for the dc terminal voltage and provides a drive signal as an error signal to maintain the applied dc test voltages at stable levels. A pulsed I-V (current and voltage) or pulsed S-parameter (scattering parameter) measurement can be accomplished within 1 microsecond of the leading edge of the gate pulse with reduced drain-voltage transients. When the I-V measurements are made quickly after the rising edge of the gate pulse, self-heating and trap effects will be minimized. The resulting model will closely match the measured performance of the device.

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