41 to 50 of 42,221 Results
Nov 11, 1996
Gautier, T. N., 1996, "(abstract) An All Sky Cirrus Confusion Noise Map for WIRE", https://hdl.handle.net/2014/26519, Sagamihara, Japan, JPL Open Repository
The Wide Field Infrared Explorer (WIRE) is a Small Explorer (SMEX) satellite scheduled for launch in 1998 which will carry out a sky survey of at least 100 square degrees in the wavelength regions of 9-15µm and 21-27µm with spatial resolution of approximately 20 arcsec and sensit... |
Sep 19, 1995
Stephenson, R. Rhoads, 1995, "(abstract) An Assessment of Electric Propulsion Research, Development, and Application in the United States", https://hdl.handle.net/2014/33669, Moscow, JPL Open Repository
This paper will discuss the development of Electric Propulsion technology in the U.S. from the 1960's to the present. It will summarize the various activities related to arcjets, resistojets, pulsed plasma thrustors, magneto-plasma-dynamic thrustors, ion engines, and more recentl... |
Dec 15, 1996
Sakurai, R.; Ho, C. M.; Tsurutani, B. T.; Goldstein, B. E.; Balogh, A., 1996, "(abstract) An Extensive Search for Interplanetary Slow-mode Shocks: Ulysses", https://hdl.handle.net/2014/27364, San Francisco, CA, JPL Open Repository
Ulysses has accumulated five years of interplanetary solar wind plasma and IMF measurements. These data cover from 1 to approximately 5 AU and all the heliographic latitudes. Based on these data, we perform an extensive search for the slow-mode shocks. We find a considerable numb... |
Oct 10, 1994
Barhen, Jacob; Toomarian, Nikzad, 1994, "(abstract) Application of Neural Networks to Hyperspectral Unmixing", https://hdl.handle.net/2014/33284, Paris, France, JPL Open Repository
The emergence, in recent years, of hyperspectral sensors provides a tremendous opportunity for advancing the process of detailed and direct remote detection and identification from space of targets or surface materials. Such sensors exploit the uniqueness of the corresponding spe... |
May 15, 1995
Bhaskaran, Shyam, 1995, "(abstract) Application of Non-coherent Data Types for Deep Space Navigation", https://hdl.handle.net/2014/33422, Greenbelt, MD, JPL Open Repository
Several options are being examined to reduce the costs of spacecraft and deep space missions. One such option is to fly spacecraft in a non-coherent mode, that is, the spacecraft does not carry a transponder and cannot coherently return a Doppler signal. Historically, such one-wa... |
Oct 8, 1996
Bar-Cohen, Yoseph, 1996, "(abstract) Application of Space Technology to NDE at JPL", https://hdl.handle.net/2014/27480, Los Angeles, CA, JPL Open Repository
JPL is responsible for the deep space exploration using spacecraft and telerobotic technologies. Since all its missions are one of a kind and hardware dependent, the NDE requirements are significantly more stringent than the ones for aerospace conventional needs. The multidiscipl... |
Jan 14, 1997
Ho, C. M.; Mannucci, A. J.; Lindqwister, U. J.; Pi, X.; Sparks, L. C.; Rao, A. M.; Wilsion, B. D.; Yuan, D. N.; Reyes, M., 1997, "(abstract) Application of the GPS Worldwide Network in the Study of Global Ionospheric Storms", https://hdl.handle.net/2014/27505, Santa Monica, CA, JPL Open Repository
Ionospheric storm dynamics as a response to the geomagnetic storms is a very complicated global process involving many different mechanisms. Studying ionospheric storms will help us to understand the energy coupling process between the Sun and Earth and possibly also to effective... |
Apr 21, 1997
Gunapala, S. D.; Bandara, S. V.; Liu, J. K.; Sundaram, M.; Hong, W.; Shott, C. A.; Hoelter, T.; Laband, S.; James, J. B., 1997, "(abstract) Applications of Long-wavelength 256x256 GaAs/Al&subx;Ga&sub1-x;As Quantum Well Infrared Photodetector Hand-held Camera", https://hdl.handle.net/2014/27487, Orlando, FL, JPL Open Repository
A 9 µm 256x256 hand-held quantum well infrared photodetector (QWIP) camera has been demonstrated. Excellent imagery, with a noise equivalent differential temperature (NEƔ) of 26 mK has been achieved. In this presentation, we discuss the development of this very sensitive long wav... |
Jun 19, 1995
McElrath, T.P.; Cangahuala, L.A.; Miller, K.J.; Stravert, L.R.; Garcia-Perez, Raul, 1995, "(abstract) ARGOS: a System to Monitor Ulysses Nutation and Thruster Firings from Variations of the Spacecraft Radio Signal", https://hdl.handle.net/2014/33532, Toulouse, France, JPL Open Repository
Ulysses is a spin-stabilized spacecraft that experienced significant nutation after its launch in October 1990. This was due to the Sun-spacecraft-Earth geometry, and a study of the phenomenon predicted that the nutation would again be a problem during 1994-95. The difficulty of... |
Oct 31, 1994
Hudson, R.S.; Ostro, S.J.; Harris, A.W., 1994, "(abstract) Asteroid 4769 Casalia: Intrepretation of Optical Lightcurves Using a Radar-Derived Shape Model", https://hdl.handle.net/2014/34590, Washington, DC, JPL Open Repository
A 167-parameter, 3-D shape model of Castalia, obtained from inversion of delay-Doppler images, constrained the object's subradar latitude on the date of the observations by defining an annular sky region that contains Castalia's pole. We have used the shape model and nominal Hapk... |