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  • United States  (330)
  • Earth Resources and Remote Sensing  (244)
  • Electronics and Electrical Engineering  (183)
  • 2000-2004  (757)
  • 2001  (757)
  • 1
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    NASA Tech Briefs, January 2001 (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The topics include: 1) A "Model" of Interactive Engineering; 2) Feature Section: Communications Technology; 3) lnReview; 4) Application Briefs; 5) Submillimeter-Wave Image Sensor; 6) Ultrasonic/Sonic Drill/Corers With Integrated Sensors; 7) Normally Closed, Piezoelectrically Actuated Microvalve; 8) Magnetostrictively Actuated Valves for Cryosurgical Probes; 9) Remote Sensing of Electric Fields in Clouds; 10) Wireless-Communication Headset Subsystem To Enhance Signaling; 11) Power Amplifier With 9 to 13 dB of Gain From 65 to 146 GHz; 12) Humidity Interlock for Protecting a Cooled Laser Crystal; 13) A Lightweight Ambulatory Physiological Monitoring System; 14) Improvements in a Lightning-Measuring Instrument; 15) Broad-Band, Noninvasive Radio-Frequency Current Probe; 16) Web-Based Technology Distributes Lean Models; 17) Software Guides Aeroelastic-Systems Design; and 18) Postprocessing Software for Micromechanics Analysis Code. A Photonics West 2001 Preview Tech Brief supplement to this January 2001 issue is also included.
    Keywords: Electronics and Electrical Engineering
    Type: (ISSN 0145-319X)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Zee electrical interconnect (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An interconnect, having some length, that reliably connects two conductors separated by the length of the interconnect when the connection is made but in which one length if unstressed would change relative to the other in operation. The interconnect comprises a base element an intermediate element and a top element. Each element is rectangular and formed of a conducting material and has opposed ends. The elements are arranged in a generally Z-shape with the base element having one end adapted to be connected to one conductor. The top element has one end adapted to be connected to another conductor and the intermediate element has its ends disposed against the other end of the base and the top element. Brazes mechanically and electrically interconnect the intermediate element to the base and the top elements proximate the corresponding ends of the elements. When the respective ends of the base and the top elements are connected to the conductors, an electrical connection is formed therebetween, and when the conductors are relatively moved or the interconnect elements change length the elements accommodate the changes and the associated compression and tension forces in such a way that the interconnect does not mechanically fatigue.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 3
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    Using Multiple Space Assests with In-Situ Measurements to Track Flooding in Thailand (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: Increasing numbers of space assets can enable coordinated measurements of flooding phenomena to enhance tracking of extreme events. We describe the use of space and ground measurements to target further measurements as part of a flood monitoring system in Thailand. We utilize rapidly delivered MODIS data to detect major areas of flooding and the target the Earth Observing One Advanced Land Imager sensor to acquire higher spatial resolution data. Automatic surface water extent mapping products delivered to interested parties. We are also working to extend our network to include in-situ sensing networks and additional space assets.
    Keywords: Earth Resources and Remote Sensing
    Type: 34th International Symposium on Remote Sensing of Environment; Apr 10, 2011 - Apr 15, 2011; Sydney; Australia
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Fabricating and using a micromachined magnetostatic relay or switch (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A micromachined magnetostatic relay or switch includes a springing beam on which a magnetic actuation plate is formed. The springing beam also includes an electrically conductive contact. In the presence of a magnetic field, the magnetic material causes the springing beam to bend, moving the electrically conductive contact either toward or away from another contact, and thus creating either an electrical short-circuit or an electrical open-circuit. The switch is fabricated from silicon substrates and is particularly useful in forming a MEMs commutation and control circuit for a miniaturized DC motor.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 5
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    Oleoresin, Chemistry and Spectral Reflectance in "Stressed" Lodgepole and White Bark Pine, Mammoth Mountain, California (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Development of methods to identify the physical and chemical character of materials on the earth's surface is one of the foci of hyperspectral remote sensing activities. Enhancing the ability to elucidate changes in foliar chemistry that relate to the health of a plant is a benefit to plant physiologists, foresters, and plant ecologists, as well as geologist and environmental scientists. Vegetation covers the landscape throughout the temperate and tropical regions of the earth. The existence of vegetation in these areas presents special problems to remote sensing systems since geologic bedrock and alteration zones are masked. At times, however, alterations in the soil/sediment geochemical environment result in foliar chemical changes that are detectable via remote sensing. Examples include monitoring of chlorophyll reflectance/fluorescence and equivalent water thickness indices as indicators of drought-induced plant stress. Another processing and interpretation approach used with hyperspectral data has been principal components analysis (PCA). Rowan et al. used PCA to identify absorption feature patterns obtained from vegetated areas with discrete bedrock geology or mineralization as the substrate. Many researchers highlight the need to advance our ability for hyperspectral imaging in vegetated areas as a near-term priority.
    Keywords: Earth Resources and Remote Sensing
    Type: Proceedings of the Tenth JPL Airborne Earth Science Workshop; 219-228
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Kinetic Inductance Photodetectors Based on Nonequilibrium Response in Superconducting Thin-Film Structures (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: While experimental studies of kinetic-inductance sensors have been limited so far by the temperature range near the superconducting transition, these detectors can be very sensitivity at temperatures well below the transition, where the number of equilibrium quasiparticles is exponentially small. In this regime, a shift of the quasiparticle chemical potential under radiation results in the change of the kinetic inductance, which can be measured by a sensitive SQUID readout. We modeled the kinetic inductance response of detectors made from disordered superconducting Nb, NbC, and MoRe films. Low phonon transparency of the interface between the superconductor and the substrate causes substantial re-trapping of phonons providing high quantum efficiency and the operating time of approximately 1 ms at 1 K. Due to the small number of quasiparticles, the noise equivalent power of the detector determined by the quasiparticle generation-recombination noise can be as small as approximately 10(exp -19) W/Hz(exp 1/2) at He4 temperatures.
    Keywords: Electronics and Electrical Engineering
    Type: Proceedings of the Twenlfth International Symposium on Space Terahertz Technology; 112-120; JPL-Publ-01-18
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    NASA TECHNICAL REPORTS
  • 7
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    Design Considerations for Heavily-Doped Cryogenic Schottky Diode Varactor Multipliers (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Diode modeling for Schottky varactor frequency multipliers above 500 GHz is presented with special emphasis placed on simple models and fitted equations for rapid circuit design. Temperature- and doping-dependent mobility, resistivity, and avalanche current multiplication and breakdown are presented. Next is a discussion of static junction current, including the effects of tunneling as well as thermionic emission. These results have been compared to detailed measurements made down to 80 K on diodes fabricated at JPL, followed by a discussion of the effect on multiplier efficiency. Finally, a simple model of current saturation in the undepleted active layer suitable for inclusion in harmonic balance simulators is derived.
    Keywords: Electronics and Electrical Engineering
    Type: Proceedings of the Twenlfth International Symposium on Space Terahertz Technology; 485-494; JPL-Publ-01-18
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    NASA TECHNICAL REPORTS
  • 8
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    Power supply with air core transformer and seperated power supplies for high dynamic range (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A power supply for a quadrupole mass spectrometer which operates using an RF signal. The RF signal is controllable via a feedback loop. The feedback loop is from the output, through a comparator, and compared to a digital signal. An air core transformer is used to minimize the weight. The air core transformer is driven via two out of phase sawtooth signals which drive opposite ends of the transformer.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 9
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    Three-dimensional modular electronic interconnection system (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A three-dimensional connection system uses a plurality of printed wiring boards with connectors completely around the printed wiring boards, and connected by an elastomeric interface connector. The device includes internal space to allow room for circuitry. The device is formed by stacking an electronics module, an elastomeric interface board on the electronics module such that the interface board's exterior makes electrical connection with the connectors around the perimeter of the interface board, but the internal portion is open to allow room for the electrical devices on the printed wiring board. A plurality of these devices are stacked between a top stiffener and a bottom device, and held into place by alignment elements.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 10
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    Magnetically coupled signal isolator (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A current determiner having an output at which representations of input currents are provided having an input conductor for the input current and a current sensor supported on a substrate electrically isolated from one another but with the sensor positioned in the magnetic fields arising about the input conductor due to any input currents. The sensor extends along the substrate in a direction primarily perpendicular to the extent of the input conductor and is formed of at least a pair of thin-film ferromagnetic layers separated by a non-magnetic conductive layer. The sensor can be electrically connected to electronic circuitry formed in the substrate including a nonlinearity adaptation circuit to provide representations of the input currents of increased accuracy despite nonlinearities in the current sensor, and can include further current sensors in bridge circuits.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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