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  • 1
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    Individual Pressure Vessel (PV) and Common Pressure Vessel (CPV) Nickel-Hydrogen Battery Performance Under LEO Cycling Conditions (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: LEO life cycle testing of Individual Pressure Vessel (PV) and Common Pressure Vessel (CPV) nickel-hydrogen cell packs have been sponsored by the NASA Aerospace Flight Battery Program. The cell packs have cycled under both 35% and 60% depth-of- discharge and temperature conditions of -5 C and +lO C. The packs have been on test since as early as 1992 and have generated a substantial database. This report will provide insight into performance trends as a function of the specific cell configuration and manufacturer for eight separate nickel-hydrogen battery cell packs.
    Keywords: Electronics and Electrical Engineering
    Type: Aerospace Corporation Space Power Workshop 2004; Apr 19, 2004 - Apr 22, 2004; Manhattan Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An Integrated 520-600 GHz Sub-Harmonic Mixer and Tripler Combination Based on GaAs MMIC Membrane Planar Schottky Diodes (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present here the design, development and test of an integrated sub-millimeter front-end featuring a 520-600 GHz sub-harmonic mixer and a 260-300 GHz frequency tripler in a single cavity. Both devices used GaAs MMIC membrane planar Schottky diode technology. The sub-harmonic mixer/tripler circuit has been tested using conventional machined as well as silicon micro-machined blocks. Measurement results on the metal block give best DSB mixer noise temperature of 2360 K and conversion losses of 7.7 dB at 520 GHz. Preliminary results on the silicon micro-machined blocks give a DSB mixer noise temperature of 4860 K and conversion losses of 12.16 dB at 540 GHz. The LO input power required to pump the integrated tripler/sub-harmonic mixer for both packages is between 30 and 50 mW
    Keywords: Electronics and Electrical Engineering
    Type: 2010 Infra Red and Millimeter Wave Conference; Sep 06, 2010; Rome; Italy
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An Integrated 520-600 GHz Sub-Harmonic Mixer and Tripler Combination Based on GaAs MMIC Membrane Planar Schottky Diodes (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present here the design, development and test of an integrated sub-millimeter front-end featuring a 520-600 GHz sub-harmonic mixer and a 260-300 GHz frequency tripler in a single cavity. Both devices used GaAs MMIC membrane planar Schottky diode technology. The sub-harmonic mixer/tripler circuit has been tested using conventional machined as well as silicon micro-machined blocks. Measurement results on the metal block give best DSB mixer noise temperature of 2360 K and conversion losses of 7.7 dB at 520 GHz. Preliminary results on the silicon micro-machined blocks give a DSB mixer noise temperature of 4860 K and conversion losses of 12.16 dB at 540 GHz. The LO input power required to pump the integrated tripler/sub-harmonic mixer for both packages is between 30 and 50 mW.
    Keywords: Electronics and Electrical Engineering
    Type: 2010 Infra Red and Millimeter Wave Conference; Sep 05, 2012 - Sep 10, 2012; Rome; Italy
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Compact Submillimeter-Wave Receivers Made with Semiconductor Nano-Fabrication Technologies (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Advanced semiconductor nanofabrication techniques are utilized to design, fabricate and demonstrate a super-compact, low-mass (〈10 grams) submillimeter-wave heterodyne front-end. RF elements such as waveguides and channels are fabricated in a silicon wafer substrate using deep-reactive ion etching (DRIE). Etched patterns with sidewalls angles controlled with 1 deg precision are reported, while maintaining a surface roughness of better than 20 nm rms for the etched structures. This approach is being developed to build compact 2-D imaging arrays in the THz frequency range.
    Keywords: Electronics and Electrical Engineering
    Type: IEEE International Microwave Symposium; Apr 25, 2011; Baltimore, MD; United States
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    NASA TECHNICAL REPORTS
  • 5
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    NASA's Exploration Technology Development Program Energy Storage Project Battery Technology Development (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Technical Interchange Meeting was held at Saft America s Research and Development facility in Cockeysville, Maryland on Sept 28th-29th, 2010. The meeting was attended by Saft, contractors who are developing battery component materials under contracts awarded through a NASA Research Announcement (NRA), and NASA. This briefing presents an overview of the components being developed by the contractor attendees for the NASA s High Energy (HE) and Ultra High Energy (UHE) cells. The transition of the advanced lithium-ion cell development project at NASA from the Exploration Technology Development Program Energy Storage Project to the Enabling Technology Development and Demonstration High Efficiency Space Power Systems Project, changes to deliverable hardware and schedule due to a reduced budget, and our roadmap to develop cells and provide periodic off-ramps for cell technology for demonstrations are discussed. This meeting gave the materials and cell developers the opportunity to discuss the intricacies of their materials and determine strategies to address any particulars of the technology.
    Keywords: Electronics and Electrical Engineering
    Type: E-17766 , Joint Saft America-NRA Contractor-NASA Technical Interchange Meeting on Cell Components and Cell Development; Sep 28, 2010; Cockeysville, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Apparatus for providing sensory substitution of force feedback (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A feedback apparatus for an operator to control an effector that is remote from the operator to interact with a remote environment has a local input device to be manipulated by the operator. Sensors in the effector's environment are capable of sensing the amplitude of forces arising between the effector and its environment, the direction of application of such forces, or both amplitude and direction. A feedback signal corresponding to such a component of the force, is generated and transmitted to the environment of the operator. The signal is transduced into an auditory sensory substitution signal to which the operator is sensitive. Sound production apparatus present the auditory signal to the operator. The full range of the force amplitude may be represented by a single, audio speaker. Auditory display elements may be stereo headphones or free standing audio speakers, numbering from one to many more than two. The location of the application of the force may also be specified by the location of audio speakers that generate signals corresponding to specific forces. Alternatively, the location may be specified by the frequency of an audio signal, or by the apparent location of an audio signal, as simulated by a combination of signals originating at different locations.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Rapid flow fractionation of particles combining liquid and particulate dielectrophoresis (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Rapid, size-based, deposition of particles from liquid suspension is accomplished using a nonuniform electric field created by coplanar microelectrode strips patterned on an insulating substrate. The scheme uses the dielectrophoretic force both to distribute aqueous liquid containing particles and, simultaneously, to separate the particles. Size-based separation is found within nanoliter droplets formed along the structure after voltage removal. Bioparticles or macromolecules of similar size can also be separated based on subtle differences in dielectric property, by controlling the frequency of the AC current supplied to the electrodes.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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