Acoustic black hole for sensing applications

    公开(公告)号:US10900934B2

    公开(公告)日:2021-01-26

    申请号:US15951566

    申请日:2018-04-12

    Abstract: Structural health monitoring systems and methods are described that incorporate one or more acoustic black holes in a sensing capacity. The acoustic black hole provides low- or no-reflection capabilities combined with high displacement of an edge upon excitation. The sensor can be utilized to differentiate in-plane acousto-ultrasonic wave excitations from out-of-plane excitations as well as to separate the in-plane and out-of-plane components of an excitation acousto-ultrasonic wave. Sensors can incorporate features such as mode selectivity, omnidirectional sensing, frequency tunability, quasi-static strain insensitivity, and mechanical amplification.

    Wireless damage assessment during manufacturing

    公开(公告)号:US10816513B2

    公开(公告)日:2020-10-27

    申请号:US15670372

    申请日:2017-08-07

    Inventor: Paul Henry Ziehl

    Abstract: A non-intrusive monitoring method and system for the detection and potential assessment of damage that may occur during a manufacturing process is described. Potential damage events such as impact events can be detected by one or more sensors located on a workpiece or on a machine utilized in the manufacturing process. Through wireless monitoring of the sensors, potential damage events are detected and products of the manufacturing process can be examined to determine if the event has led to damage.

    Self-forming membrane for high flux and selective electrochemistry-based CO2 capture

    公开(公告)号:US10814270B2

    公开(公告)日:2020-10-27

    申请号:US15975807

    申请日:2018-05-10

    Abstract: A low-cost and easy-to-fabricate mixed e− and CO32− conducting membrane for advanced high-flux and selective electrochemical CO2 separation from flue gas is provided. The membrane includes a CO32−-conducting molten carbonate phase and an e−-conducting lithiated Ni-oxide interphase that can be formed in situ during operation. The membrane exhibits a CO2 flux density greater than 0.8 mL/(minute·cm2) at 850° C. with a selectivity ranging from about 100 to about 500 and excellent stability for up to about 450 hours. Further, the self-formed interphase Li0.4Ni1.6O2 is highly electron conducting and can provide electrons to the co-reduction of CO2 and O2 into CO32−. Such a membrane is an alternative to the conventional “size-sieving” inorganic and “dissolution-diffusion” organic counterparts for CO2 capture from flue gas.

    Fly ash-based geopolymer concrete and method of formation

    公开(公告)号:US10800704B2

    公开(公告)日:2020-10-13

    申请号:US16127496

    申请日:2018-09-11

    Abstract: Fly ash-based geopolymer binders and activating solutions for use in forming a concrete as well as methods for forming concrete including the binders are described. The fly ash-based geopolymer binders include a combination of fly ash, silica fume, and sodium hydroxide as well as an amount of Portland cement. Concretes formed of the binders can exhibit excellent compressive strength and fuel energy characteristics as well as being more cost efficient as compared to other concretes. The inclusion of an amount of Portland cement in the binders can allow for a decrease in sodium hydroxide and silica fume content while maintaining desirable compressive strength characteristics.

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