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55 条记录 (耗时 0.091 秒)

    Encapsulated thermoacoustic projector based on freestanding carbon nanotube film
    5.
    发明授权
    Encapsulated thermoacoustic projector based on freestanding carbon nanotube film 有权

    公开(公告)号：US09635468B2

    公开(公告)日：2017-04-25

    申请号：US14776257

    申请日：2014-03-14

    申请人： THE BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM

    发明人： Ali E. Aliev ,  Ray H. Baughman

    IPC分类号： H04R25/00 ,  H04R23/00 ,  B82Y30/00

    CPC分类号： H04R23/002 ,  B82Y30/00 ,  Y10S977/751 ,  Y10S977/752 ,  Y10S977/932

    摘要： A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, γ=Cp/Cv, and low heat capacity, Cp). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.

    Sheath-run artificial muscles and methods of use thereof
    9.
    发明授权
    Sheath-run artificial muscles and methods of use thereof 有权

    公开(公告)号：US12006598B2

    公开(公告)日：2024-06-11

    申请号：US17610045

    申请日：2020-05-07

    申请人： BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM

    发明人： Ray H. Baughman ,  Jiuke Mu ,  Monica Jung De Andrade ,  Shaoli Fang ,  Na Li ,  Carter S. Haines

    IPC分类号： D02G3/36 ,  D02G3/44

    CPC分类号： D02G3/36 ,  D02G3/448

    摘要： Sheath-run artificial muscles (or SRAMs) are described in which the dimensional changes and/or modulus changes of a sheath on the surface of a twisted or coiled host yarn or fiber drives torsional and tensile actuation. The sheath-core artificial muscle includes a sheath on a coiled core yarn or fiber that has inserted twist, in which the sheath does not include a yarn, the coiled core yarn or fiber includes a core yarn or fiber, the sheath can change volume, modulus, or a combination thereof when actuated by an influence source to drive actuation, and the influence source is selected from a group consisting of absorption processes, desorption processes, changes in temperature, changes in external pressure, changes in a magnetic field, changes in an electric field, exposures to actinic radiation, electrochemical charge and discharge, chemical reactions, and combinations thereof. These sheath-run muscles can be used for diverse applications, such as robots, robotic devices, energy harvesters, muscles that enable electrical energy harvesting, comfort-adjusting textiles, comfort-adjusting clothing, bio-powered intelligent muscles that control the release of drugs, muscles for appropriate drug delivery, intelligent muscles that sense their environment and actuate in response, muscles for artificial limbs and orthotic gloves, muscles for haptic applications, muscles that can perform in extreme environments, and muscles for intelligent solar panel positioning.