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  • Earth Resources and Remote Sensing  (1,434)
  • United States  (1,321)
  • Computer Programming and Software  (1,145)
  • Electronics and Electrical Engineering  (863)
  • 2000-2004  (4,763)
Collection
Keywords
Publisher
Years
Year
  • 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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    Apparatus for measuring high frequency currents (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An apparatus for measuring high frequency currents includes a non-ferrous core current probe that is coupled to a wide-band transimpedance amplifier. The current probe has a secondary winding with a winding resistance that is substantially smaller than the reactance of the winding. The sensitivity of the current probe is substantially flat over a wide band of frequencies. The apparatus is particularly useful for measuring exposure of humans to radio frequency currents.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Evolvable circuit with transistor-level reconfigurability (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An evolvable circuit includes a plurality of reconfigurable switches, a plurality of transistors within a region of the circuit, the plurality of transistors having terminals, the plurality of transistors being coupled between a power source terminal and a power sink terminal so as to be capable of admitting power between the power source terminal and the power sink terminal, the plurality of transistors being coupled so that every transistor terminal to transistor terminal coupling within the region of the circuit comprises a reconfigurable switch.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Thin layer composite unimorph ferroelectric driver and sensor (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method for forming ferroelectric wafers is provided. A prestress layer is placed on the desired mold. A ferroelectric wafer is placed on top of the prestress layer. The layers are heated and then cooled, causing the ferroelectric wafer to become prestressed. The prestress layer may include reinforcing material and the ferroelectric wafer may include electrodes or electrode layers may be placed on either side of the ferroelectric layer. Wafers produced using this method have greatly improved output motion.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Resolver to 360.degree. linear analog converter and method (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The converter produces a linear analog signal that is linearly proportional to a shaft angle of a resolver over 360.degree.. An excitation cosine signal supplied to the resolver and a response cosine signal received from the output windings of the resolver are converted to logic level signals. Digital logic is performed on the logic level signals in a programmable digital logic device to produce a logic level pulse-width modulated signal. The logic level pulse-width modulated signal is used to control a switch to switch between two reference voltage levels to produce a pulse-width modulated signal, which is filtered and buffered to produce the linear analog signal.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    [New Retrieval Algorithms for Geophysical Products from GLI and MODIS Data] (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Below is the 1st year progress report for NAG5-13435 "New Retrieval Algorithms for Geophysical Products from GLI and MODIS Data". Activity on this project has been coordinated with our NASA DB project NAG5-9604. For your convenience, this report has six sections and an Appendix. Sections I - III discuss specific activities undertaken during the past year to analyze/use MODIS data. Section IV formally states our intention to no longer pursue any research using JAXA's (formerly NASDA's) GLI instrument which catastrophically failed very early after launch (also see the Appendix). Section V provides some indications of directions for second year activities based on our January 2004 telephone discussions and email exchanges. A brief summary is given in Section VI.
    Keywords: Earth Resources and Remote Sensing
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Meshing, Visualization, and Computational Environments (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: There was probably no higher profile application of meshing, visualization, and computational software this past year than that performed in support of the space shuttle's Return to Flight activities. After heavy use of simulation during the accident investigation, these same tools are now helping address safety and operational issues. In turn, these applications are raising the bar for computational tools in terms of simulation fidelity and turnaround time.
    Keywords: Computer Programming and Software
    Type: Aerospace America; 42; 12; 75
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The Lunar L1 Gateway Concept: Supporting Future Major Space Science Facilities (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: We report here on a series of ongoing studies to evaluate alternative architectures for future space science facilities and how robots, humans, and autonomous systems might be optimally used to support them. This presentation outlines one scenario -- a "Gateway" at the Earth-Moon L1 point for supporting multiple options beyond Low Earth Orbit -- plus our process for evaluating human/robotic activities to construct telescopes.
    Keywords: Computer Programming and Software
    Type: New Concepts for Far-Infrared and Submillimeter Space Astronomy; 259-263; NASA/CP-2003-212233
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Software Past, Present, and Future: Views from Government, Industry and Academia (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Views from the NASA CIO NASA Software Engineering Workshop on software development from the past, present, and future are presented. The topics include: 1) Software Past; 2) Software Present; 3) NASA's Largest Software Challenges; 4) 8330 Software Projects in Industry Standish Groups 1994 Report; 5) Software Future; 6) Capability Maturity Model (CMM): Software Engineering Institute (SEI) levels; 7) System Engineering Quality Also Part of the Problem; 8) University Environment Trends Will Increase the Problem in Software Engineering; and 9) NASA Software Engineering Goals.
    Keywords: Computer Programming and Software
    Type: Proceedings of the Twenty-Fourth Annual Software Engineering Workshop; NASA/CP-2000-209890
    Format: text
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    NASA TECHNICAL REPORTS
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