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  • Electronics and Electrical Engineering
  • 2005-2009
  • 1985-1989  (7)
  • 1960-1964
  • 1950-1954
  • 1986  (7)
  • 1
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    Theoretical Study of the Electric Dipole Moment Function of the CIO Molecule (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: The potential energy function and electric dipole moment function (EDMF) are computed for CIO Chi(sup 2)Pi using several different techniques to include electron correlation. The EDMF is used to compute Einstein coefficients, vibrational lifetimes, and dipole moments in higher vibrational levels. Remaining questions concerning the position of the maximum of the EDMF may be resolved through experimental measurement of dipole moments of higher vibrational levels. The band strength of the 1-0 fundamental transition is computed to be 12 +/- 2 /sq cm atm in good agreement with three experimental values, but larger than a recent value of 5 /sq cm atm determined from infrared heterodyne spectroscopy. The theoretical methods used include SCF, CASSCF, multireference singles plus doubles configuration interaction (MRCI) and contracted CI, coupled pair functional (CPF), and a modified version of the CPF method. The results obtained using the different methods are critically compared.
    Keywords: Electronics and Electrical Engineering
    Type: Journal of Physical Chemistry (ISSN 0021-9606); Volume 85; No. 5; 2836-2844
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flexible Circuits (1986)
    In:  CASI
    Details
    Publication Date: 2018-06-09
    Description: Adflex Solutions, Inc.'s flexible circuits may be molded to the shape of a chassis for bulk reduction. Particularly valuable when circuitry must be moved. They are produced by combining a plastic film, a metallic conductor and an adhesive. One adhesive, LARC-TPI, developed by the Langley Research Center, is a thermoplastic polyimide resin used to produce laminates by Rogers Corporation. It can be processed at a lower temperature, has good moisture resistance and excellent adherence. It is used to bond film to copper foil conductor materials in flexible circuits. The circuits have both aerospace and commercial applications.
    Keywords: Electronics and Electrical Engineering
    Type: Spinoff 1986; 74-75
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Training Circuit Boards (1986)
    In:  CASI
    Details
    Publication Date: 2018-06-09
    Description: Young Electronics Company's new product is a testboard developed by the Jet Propulsion Laboratory as a tool for training and qualifying personnel in board assembly and in the art of soldering components without damaging boards or components. The boards are used for pre- employment testing and employee requalification.
    Keywords: Electronics and Electrical Engineering
    Type: Spinoff 1986; 104-105
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Motor Starters (1986)
    In:  CASI
    Details
    Publication Date: 2018-06-09
    Description: The power factor controller (PFC) was invented by a NASA engineer. It matches voltage with a motor's actual need by sensing shifts in the relationship between voltage and current flow. With the device, power can be trimmed as much as 65%. Intellinet adopted this technology and designed "soft start" and "load-responsive" control modes to start engines gradually and recycle voltage without reducing motor speed. Other features are lower motor heat and faster fault identification.
    Keywords: Electronics and Electrical Engineering
    Type: Spinoff 1986; 82
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Redundant control system for X-wing valve actuators (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The capability of compensating automatically for a failure in an actuator and the associated drive circuit is enhanced by providing a dual channel actuator, each channel having a drive coil and a position sensor tracking the position of the actuator output shaft. A separate circuit is provided for each actuator channel to detect drive loop failures and hydraulic failures. When the drive loop of one channel fails, it is disengaged, and the gain in the remaining drive loop is doubled to maintain authority. In an embodiment, the remaining drive loop cannot disengage when certain criteria, relating to the failure of associated actuators, are met. The invention is particularly useful for aerospace applications.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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  • 6
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    PbS-PbSe IR detector arrays (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A silicon wafer is provided which does not employ individually bonded leads between the IR sensitive elements and the input stages of multiplexers. The wafer is first coated with lead selenide in a first detector array area and is thereafter coated with lead sulfide within a second detector array area. The described steps result in the direct chemical deposition of lead selenide and lead sulfide upon the silicon wafer to eliminate individual wire bonding, bumping, flip chipping, planar interconnecting methods of connecting detector array elements to silicon chip circuitry, e.g., multiplexers, to enable easy fabrication of very long arrays. The electrode structure employed, produces an increase in the electrical field gradient between the electrodes for a given volume of detector material, relative to conventional electrode configurations.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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  • 7
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    Silicon controlled rectifier polyphase bridge inverter commutated with gate-turn-off thyristor (1986)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A polyphase SCR inverter (10) having N switching poles, each comprised of two SCR switches (1A, 1B; 2A, 2B . . . NA, NB) and two diodes (D1B; D1B; D2A, D2B . . . DNA, DNB) in series opposition with saturable reactors (L1A, L1B; L2A, L2B . . . LNA, LNB) connecting the junctions between the SCR switches and diodes to an output terminal (1, 2 . . . 3) is commutated with only one GTO thyristor (16) connected between the common negative terminal of a dc source and a tap of a series inductor (14) connected to the positive terminal of the dc source. A clamp winding (22) and diode (24) are provided, as is a snubber (18) which may have its capacitance (c) sized for maximum load current divided into a plurality of capacitors (C.sub.1, C.sub.2 . . . C.sub.N), each in series with an SCR switch S.sub.1, S.sub.2 . . . S.sub.N). The total capacitance may be selected by activating selected switches as a function of load current. A resistor 28 and SCR switch 26 shunt reverse current when the load acts as a generator, such as a motor while braking.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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