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  • Other Sources  (840)
  • Electronics and Electrical Engineering
  • 2010-2014  (765)
  • 1985-1989  (75)
  • 1
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    Battery Cell Balancing System and Method (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A battery cell balancing system is operable to utilize a relatively small number of transformers interconnected with a battery having a plurality of battery cells to selectively charge the battery cells. Windings of the transformers are simultaneously driven with a plurality of waveforms whereupon selected battery cells or groups of cells are selected and charged. A transformer drive circuit is operable to selectively vary the waveforms to thereby vary a weighted voltage associated with each of the battery cells.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 2
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    Negative Dielectric Constant Material Based on Ion Conducting Materials (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Metamaterials or artificial negative index materials (NIMs) have generated great attention due to their unique and exotic electromagnetic properties. One exemplary negative dielectric constant material, which is an essential key for creating the NIMs, was developed by doping ions into a polymer, a protonated poly(benzimidazole) (PBI). The doped PBI showed a negative dielectric constant at megahertz (MHz) frequencies due to its reduced plasma frequency and an induction effect. The magnitude of the negative dielectric constant and the resonance frequency were tunable by doping concentration. The highly doped PBI showed larger absolute magnitude of negative dielectric constant at just above its resonance frequency than the less doped PBI.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 3
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    Wireless Open-Circuit In-Plane Strain and Displacement Sensor Requiring No Electrical Connections (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A wireless in-plane strain and displacement sensor includes an electrical conductor fixedly coupled to a substrate subject to strain conditions. The electrical conductor is shaped between its ends for storage of an electric field and a magnetic field, and remains electrically unconnected to define an unconnected open-circuit having inductance and capacitance. In the presence of a time-varying magnetic field, the electrical conductor so-shaped resonates to generate harmonic electric and magnetic field responses. The sensor also includes at least one electrically unconnected electrode having an end and a free portion extending from the end thereof. The end of each electrode is fixedly coupled to the substrate and the free portion thereof remains unencumbered and spaced apart from a portion of the electrical conductor so-shaped. More specifically, at least some of the free portion is disposed at a location lying within the magnetic field response generated by the electrical conductor. A motion guidance structure is slidingly engaged with each electrode's free portion in order to maintain each free portion parallel to the electrical conductor so-shaped.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 4
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    Device and Method for Gathering Ensemble Data Sets (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An ensemble detector uses calibrated noise references to produce ensemble sets of data from which properties of non-stationary processes may be extracted. The ensemble detector comprising: a receiver; a switching device coupled to the receiver, the switching device configured to selectively connect each of a plurality of reference noise signals to the receiver; and a gain modulation circuit coupled to the receiver and configured to vary a gain of the receiver based on a forcing signal; whereby the switching device selectively connects each of the plurality of reference noise signals to the receiver to produce an output signal derived from the plurality of reference noise signals and the forcing signal.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 5
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    Method of Forming Textured Silicon Substrate by Maskless Cryogenic Etching (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Disclosed herein is a textured substrate comprising a base comprising silicon, the base having a plurality of needle like structures depending away from the base, wherein at least one of the needle like structures has a depth of greater than or equal to about 50 micrometers determined perpendicular to the base, and wherein at least one of the needle like structures has a width of less than or equal to about 50 micrometers determined parallel to the base. An anode and a lithium ion battery comprising the textured substrate, and a method of producing the textured substrate are also disclosed.
    Keywords: Electronics and Electrical Engineering
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  • 6
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    High-Efficiency Power Module (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: One or more embodiments of the present invention pertain to an all solid-state microwave power module. The module includes a plurality of solid-state amplifiers configured to amplify a signal using a low power stage, a medium power stage, and a high power stage. The module also includes a power conditioner configured to activate a voltage sequencer (e.g., bias controller) when power is received from a power source. The voltage sequencer is configured to sequentially apply voltage to a gate of each amplifier and sequentially apply voltage to a drain of each amplifier.
    Keywords: Electronics and Electrical Engineering
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  • 7
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    Systems and Methods for Peak-Seeking Control (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A computerized system and method for peak-seeking-control that uses a unique Kalman filter design to optimize a control loop, in real time, to either maximize or minimize a performance function of a physical object ("plant"). The system and method achieves more accurate and efficient peak-seeking-control by using a time-varying Kalman filter to estimate both the performance function gradient (slope) and Hessian (curvature) based on direct position measurements of the plant, and does not rely upon modeling the plant response to persistent excitation. The system and method can be naturally applied in various applications in which plant performance functions have multiple independent parameters, and it does not depend upon frequency separation to distinguish between system dimensions.
    Keywords: Electronics and Electrical Engineering
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  • 8
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    Wireless Sensing System Using Open-circuit, Electrically-conductive Spiral-trace Sensor (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A wireless sensing system includes a sensor made from an electrical conductor shaped to form an open-circuit, electrically-conductive spiral trace having inductance and capacitance. In the presence of a time-varying magnetic field, the sensor resonates to generate a harmonic response having a frequency, amplitude and bandwidth. A magnetic field response recorder wirelessly transmits the time-varying magnetic field to the sensor and wirelessly detects the sensor's response frequency, amplitude and bandwidth.
    Keywords: Electronics and Electrical Engineering
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  • 9
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    Chalcogenide Nanoionic-based Radio Frequency Switch (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A nonvolatile nanoionic switch is disclosed. A thin layer of chalcogenide glass engages a substrate and a metal selected from the group of silver and copper photo-dissolved in the chalcogenide glass. A first oxidizable electrode and a second inert electrode engage the chalcogenide glass and are spaced apart from each other forming a gap therebetween. A direct current voltage source is applied with positive polarity applied to the oxidizable electrode and negative polarity applied to the inert electrode which electrodeposits silver or copper across the gap closing the switch. Reversing the polarity of the switch dissolves the electrodeposited metal and returns it to the oxidizable electrode. A capacitor arrangement may be formed with the same structure and process.
    Keywords: Electronics and Electrical Engineering
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  • 10
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    In situ health monitoring of piezoelectric sensors (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An in situ health monitoring apparatus may include an exciter circuit that applies a pulse to a piezoelectric transducer and a data processing system that determines the piezoelectric transducer's dynamic response to the first pulse. The dynamic response can be used to evaluate the operating range, health, and as-mounted resonance frequency of the transducer, as well as the strength of a coupling between the transducer and a structure and the health of the structure.
    Keywords: Electronics and Electrical Engineering
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