Method for manufacturing high-sensitivity piezoresistive sensor using multi-level structure design

    公开(公告)号:US11120930B2

    公开(公告)日:2021-09-14

    申请号:US16314820

    申请日:2018-06-27

    IPC分类号: H01C17/28 G01D5/16

    摘要: The present invention discloses a method for manufacturing a high-sensitivity piezoresistive sensor using a multi-level structure design, including the following steps: forming first-level basic geometrical units formed of basic structural units on a substrate, where each first-level basic geometrical unit is a two-dimensional or three-dimensional network structure formed by stacking several basic structural units; stacking and combining several first-level basic geometrical units in an array to form a second-level geometrical structure, and forming a contact connection area located between adjacent first-level basic geometrical units; and dispensing a conductive adhesive in at least two positions on the substrate to form electrodes of a piezoresistive sensor, so as to obtain the piezoresistive sensor. A high-sensitivity piezoresistive sensor obtained by using the method of the present invention has flexible design and simple fabrication, can be desirably combined with various existing sensor fabrication methods, and has general applicability.

    Method for calculating earth pressure load on a tunnel

    公开(公告)号:US11118988B2

    公开(公告)日:2021-09-14

    申请号:US16349307

    申请日:2016-11-12

    发明人: Pan Li

    摘要: A method for calculating an earth pressure load on a tunnel includes the following steps: (1) taking interaction between external soil and a tunnel structure in an actual operation condition as an earth pressure load acting on the tunnel structure; (2) establishing a physical model for the tunnel structure; (3) designing, on the basis of the physical model for the tunnel structure, a plurality of structural loads in different operation conditions to obtain a plurality of different structural deformations; and (4) drawing an inference according Betti's theorem, and establishing a physical model for an original structure, such that a load on the original structure, namely an earth pressure load on the tunnel, can be directly calculated according to a load-deformation relationship of the physical model and deformation of the original structure. The above method can determine distribution and size of an actual earth pressure load on a tunnel.

    HYBRID ROTARY ENERGY HARVESTER
    94.
    发明申请

    公开(公告)号:US20210226557A1

    公开(公告)日:2021-07-22

    申请号:US16312202

    申请日:2017-11-21

    IPC分类号: H02N1/04

    摘要: The present invention relates to an energy harvester, including: a base; an electromagnetic coil fixed in the base; a disk-shaped stator magnet fixed at the center of the base; a friction plate fixing ring fixed on the base; at least one friction plate unit fixed on an inner side surface of the friction plate fixing ring; a disk-shaped rotor magnet whose bottom is in contact with the electromagnetic coil, wherein the disk-shaped rotor magnet is attracted and held to the disk-shaped stator magnet, and an outer surface of the disk-shaped rotor magnet is tangent to an outer surface of the disk-shaped stator magnet; and an annular friction plate fixed on the disk-shaped rotor magnet, wherein the annular friction plate and a friction plate are made of materials with different polarities. The foregoing energy harvester has a simple structure and high electrical energy output efficiency.

    SURFACE-MODIFIED ARAMID FIBER AND PREPARATION METHOD THEREFOR

    公开(公告)号:US20210222358A1

    公开(公告)日:2021-07-22

    申请号:US17052903

    申请日:2018-05-10

    摘要: The present invention relates to a surface-modified aramid fiber and a method for preparing the same. The method includes the following steps: modifying an aramid fiber having amino groups and carboxyl groups on the surface with siloxane γ-glycidoxypropyltrimethoxysilane to obtain a silicon methoxylated aramid fiber; reacting same with a cerium oxide coated with polydopamine modified chaotic boron nitride to obtain a surface-modified aramid fiber. The cerium oxide coated with polydopamine modified chaotic boron nitride has high ultraviolet absorption, and has extremely low catalytic activity, avoiding the damage to a fiber structure by photocatalysis during radiation, being an effective, safe and highly-efficient ultraviolet absorber. The surface-modified aramid fiber provided in the present invention has an ultraviolet-resistant function, high surface activity, good thermal performance, and better mechanical performance, providing excellent overall performance, and having higher utilization value. The method is simple and controllable, being suitable for large scale production.

    METHOD AND DEVICE FOR QUICK SEGMENTATION OF OPTICAL COHERENCE TOMOGRAPHY IMAGE

    公开(公告)号:US20210209763A1

    公开(公告)日:2021-07-08

    申请号:US16757385

    申请日:2019-05-31

    IPC分类号: G06T7/11 G06T7/00

    摘要: The present invention discloses a method and device for quick segmentation of an optical coherence tomography image, a computing device, and a computer readable storage medium. The method includes: extracting a feature value related to a pixel in the optical coherence tomography image from the pixel to obtain a feature value representative of the pixel feature, the feature value including at least one of an intensity gradient value of the pixel, an intensity multi-scale mean value of the pixel, and an angular feature value extracted from the pixel; inputting the feature value into a Sparse Bayesian Classification model containing values related to image features corresponding to a border, to obtain a probability that the image feature belongs to features of various image region borders; and obtaining borders of various image regions contained in a predefined image region based on the probabilities obtained for various pixels in the predefined image region.

    METHOD FOR PREPARING 1,3-DICARBONYL COMPOUND BASED ON METAL HYDRIDE/PALLADIUM COMPOUND SYSTEM

    公开(公告)号:US20210206708A1

    公开(公告)日:2021-07-08

    申请号:US17203097

    申请日:2021-03-16

    IPC分类号: C07C45/41 B01J23/44 B01J31/12

    摘要: Disclosed is a method for preparing a 1,3-dicarbonyl compound based on a metal hydride/palladium compound system. The method includes the following steps: suspending a palladium compound and a metal hydride in a solvent under the protection of nitrogen, then adding an electron-deficient olefin compound, reacting same at 0° C.-100° C. for 0.3 to 10 hours, then adding a saturated ammonium chloride aqueous solution to stop the reaction, and then subjecting same to extraction, evaporation until dryness, and column chromatography purification to obtain the 1,3-dicarbonyl compound. The hydride and palladium compound catalysts used by the present invention are reagents easily obtained in a laboratory. Compared to a common hydrogen hydrogenation method, the method is easier to operate, and has a higher safety, mild conditions, and a high reaction yield.

    Thermadapt shape memory polymer and application method thereof

    公开(公告)号:US11046808B2

    公开(公告)日:2021-06-29

    申请号:US16564802

    申请日:2019-09-09

    摘要: A preparation method of thermadapt shape memory polymers includes: (1) synthesis of pendant hydroxyl groups functionalized epoxy oligomer using epoxy resin and alcohol amine; (2) synthesis of alkoxyl groups terminated silane crosslinking agent by isocyanate silane coupling agent and diamine; (3) crosslinked shape memory polymers were prepared by condensation reaction of pendant hydroxyl groups functionalized epoxy oligomer and alkoxyl groups terminated silane crosslinking agent. The thermadapt shape memory polymers show high glass transition temperatures and high tensile strength. The original shape of thermadapt shape memory polymers can be reconfigured to a new permanent shape as needed, and thus effectively solving the bottleneck problems of reprocessing or reshape in the traditional crosslinked polymers once after molding. The thermadapt shape memory polymers are suitable for smart materials based on shape memory polymers with complex three-dimensional permanent shapes, and showing unfolding or folding behaviors along with convert to three-dimensional structures under heat stimulation.

    Squaraine-polymer-based ammonium/nitrogen monoxide two-component sensor, as well as preparation method and application thereof

    公开(公告)号:US11009476B2

    公开(公告)日:2021-05-18

    申请号:US16264604

    申请日:2019-01-31

    发明人: Jianmei Lu Jinghui He

    IPC分类号: G01N27/12 C08G73/02

    摘要: The invention discloses a squaraine-polymer-based ammonium/nitrogen monoxide two-component sensor, as well as a preparation method and application thereof. A preparation manner and condition for the sensor are optimized. The squaraine polymer containing azo functional group based ammonium/nitrogen monoxide two-component sensor comprises an interdigital electrode and a coating material with which the interdigital electrode is coated. The coating material is a squaraine polymer containing azo functional group and has high sensing selectivity for ammonium and nitrogen monoxide, the minimum limit of detection thereof is 1 ppb and the response/reversion time is 82s/185s. The sensing performance of the sensor for nitrogen monoxide is also tested, the minimum limit of detection can reach 40 ppb and the response/reversion time is 112s/921s.

    BETA-AMINO PHOSPHONIC ACID DERIVATIVE AND PREPARATION METHOD THEREFOR

    公开(公告)号:US20210130376A1

    公开(公告)日:2021-05-06

    申请号:US17146729

    申请日:2021-01-12

    IPC分类号: C07F9/38 B01J25/02

    摘要: A method for preparing a β-amino phosphonic acid derivative includes: dissolving N-(arylvinyl)benzamide, dialkyl phosphite, manganese acetate, and potassium carbonate in a solvent and reacting at room temperature to obtain (2-benzamido-1-arylvinyl)dialkyl-phosphonate derivative; and hydrolyzing (2-benzamido-1-arylethyl) dialkylphosphonate derivative to obtain β-amino phosphonic acid derivative. The N-(arylvinyl) benzamide derivative is used as starting material. The raw materials are easy to obtain and are of many different types. A method of preparing β-aminophosphonic acid derivative includes: dissolving N-(arylvinyl)benzamide, dialkyl phosphite, manganese acetate and potassium carbonate in a solvent, reacting at room temperature to obtain (2-benzamide-1-arylvinyl) dialkyl phosphonate derivative, and then reducing and hydrolyzing the compound to obtain β-aminophosphonic acid derivative. The method of the invention has the advantages of short synthesis route, mild reaction conditions, simple reaction operation and post-treatment process, good yield, and is suitable for large-scale production.