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42results about How to "Increase space density" patented technology

Array type flexible surface electromyography electrode and preparation method thereof

The invention discloses an array type flexible surface electromyography electrode and a preparation method thereof. The electrode is used for measuring the surface electromyography of a human body, and mainly comprises circular electrode plates, a flexible electrode substrate, insulating oil, medical proof fabric and conductive paste, wherein the circular electrode plates are arranged in an array manner, and depend on the flexible electrode substrate and the insulating oil; the medical proof fabric and the conductive paste are used for improving contact. The array electrode is characterized in that a plurality of electrode units are arranged into a space array, and has relatively good flexibility and adhesivity and relatively strong deformation adaptability. The space distance, the array arrangement and the impedance matching, which are adopted by the invention, can reduce the noise effectively and extract electromyographic signals to be convenient for subsequent signal processing. The electrode array, designed by the invention, can expand to more channels conveniently to obtain an electromyography image with enough space resolution, the adopted surface electrode array can avoid injury to the human body due to an insertion type electrode, and a multi-muscle-group image set can be obtained after enough electrode arrays are formed by expanding.
Owner:ZHEJIANG UNIV

High-precision fast-response dynamic three-dimensional pulse detector

The invention discloses a high-precision fast-response dynamic three-dimensional pulse detector, and mainly relates to the field of traditional Chinese medicine pulse detection devices. The high-precision fast-response dynamic three-dimensional pulse detector comprises a detection workbench, a computer, a support frame, a line-scan digital camera, an optical interference microscope structure assembly, a gas-filling device assembly, an airbag device assembly and a position adjustment device assembly, wherein the airbag device assembly comprises an airbag upper cover, an airbag transparent window, a sealing ring, a sensing airbag and an airbag bottom cover, and the optical interference microscope structure assembly corresponds to positions of the line-scan digital camera and the sensing airbag; the position adjustment device assembly comprises a position adjusting platform, a forearm supporting platform, a stepper motor driver, a height adjusting device and a transverse adjustment device. The high-precision fast-response dynamic three-dimensional pulse detector has the advantages that positioning of the cun, guan and chi of a wrist can be achieved automatically, and enough space information and timing information of a pulse can be acquired through high-speed acquisition of data; moreover, a basis for traditional Chinese medicine diagnosis can be provided through the comparison of cloud data, detection data points are dense, and the high-precision fast-response dynamic three-dimensional pulse detector is high in precision and quick in time response.
Owner:王庆亚

Electromagnetic ultrasonic transducer in multiphase structure and ultrasonic high-efficient excitation method

InactiveCN103837606AIncrease space densityEfficient excitation and one-way emissionUltrasonic/sonic/infrasonic wave generationSpatial densityMagnet
The invention relates to an electromagnetic ultrasonic transducer in a multiphase structure and an ultrasonic high-efficient excitation method by utilizing the electromagnetic ultrasonic transducer. By designing an EMAT excitation coil and a plurality of fold-line windings, the ultrasonic excitation space density can be improved, the fold-line winding is formed by multiple layers of inflection coils, by combining the current excitation staggered on the space and phase, the staggering relation is matched with the excitation phase, the ampere-turns in an excitation area can be effectively increased, the ultrasonic intensity is improved, and the high-efficient excitation and single-direction transmission of the ultrasonic can be realized. A permanent magnet is magnetized in the horizontal direction, the electronic ultrasonic transducer is suitable for the electromagnetic ultrasonic nondestructive detection of a detected article which is an iron magnetic material and based on the magnetostriction principle.
Owner:XIAMEN UNIV

Nano metal aerogel sterilizing and filtering material, preparation method thereof and protective mask

The invention provides a nano metal aerogel sterilizing and filtering material, a preparation method thereof and a protective mask. The nano metal aerogel sterilizing and filtering material comprisesa nano metal aerogel layer and a conductive electrode, and the conductive electrode is electrically connected with nano metal aerogel. The interior of the nano metal aerogel layer comprises a three dimensional nano network composed of metal nano wires with a sterilization function. The nano metal aerogel sterilizing and filtering material is large in specific surface area and high in activity, a large number of sterilizing metal ions can be directly formed by a nano wire network in the nano metal aerogel sterilizing and filtering material under the action of air and water vapor exhaled by a human body, and the nano metal aerogel sterilizing and filtering material has an excellent sterilizing performance and strong high conductive capacity, and can be connected to a power supply so as to load a strong electrostatic field or a directional electric field. The adsorption capacity and the killing effect on micro-nano particles, bacteria and viruses are improved, and the material can be repeatedly used. Meanwhile, the network gap of the material is small, the space density is low, free circulation of air is guaranteed, blockage caused by particulate pollutants is relieved, and the service life is prolonged.
Owner:HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)

Distributed optical fiber three-component earthquake ground motion measuring device and measuring method

The invention discloses a distributed optical fiber three-component earthquake ground motion measuring device. The device comprises a DAS (Distributed Acoustic Sensor) modem connected with a computer;the device further comprises optical fiber measuring units arranged at various measuring points; the optical fiber measuring units corresponding to various measuring points are connected in series and then are connected with the DAS modem through a head-end optical fiber connecting section; and each optical fiber measuring unit comprises a south component optical fiber winding section, an east component optical fiber winding section and an upper component optical fiber winding section which are connected with each other in series. The invention further discloses a distributed optical fiber three-component earthquake ground motion measuring method. According to the distributed optical fiber three-component earthquake ground motion measuring device provided by the invention, the calculationof earthquake ground motion signals is real time and accurate, and the high spatial sampling characteristic of a distributed fiber technology is relied on to obtain the spatially dense three-component earthquake ground motion signal acquisition capability, which is very beneficial to the fine imaging analysis of an underground structure. The observation speed is fast, a large number of measuringpoints can be provided, and signal data with high spatial density and high time density can be obtained.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

A kind of cross-linked waterborne polyurethane and preparation method thereof

The invention discloses a preparation method for cross-linking waterborne polyurethane. The preparation method comprises the following steps that 1, polyester polyol and diisocyanate are mixed, then acatalyst of dibutyltin dilaurate is dropwise added, nitrogen is introduced, and reaction is carried out; 2, a hydrophilic chain extender is added for reaction, then a end-capping chain extender is added for reaction, and after a neutralizer is added for reaction, water is added for dispersing so as to obtain a waterborne polyurethane emulsion; and 3, a multi-double-bond castor oil solution is added into the waterborne polyurethane emulsion, an initiator is dropwise added, reaction is carried out, and after the reaction is finished, a solvent is removed so as to obtain the cross-linking waterborne polyurethane. According to the method, the waterborne polyurethane emulsion is firstly synthesized, then free radical copolymerization reaction is carried out on multi-double-bond castor oil andthe waterborne polyurethane, the multi-double-bond castor oil is connected into a waterborne polyurethane structure so as to form the cross-linking waterborne polyurethane with a spatial network structure, and therefore the mechanical performance of the cross-linking waterborne polyurethane is improved; and the spatial density inside a polymer is increased, so that the space is shrunk, water molecules are difficult to enter, and therefore the water resistance is improved.
Owner:SHAANXI UNIV OF SCI & TECH

Heterogeneous material gradient structure connecting joint and preparation method thereof

The invention provides a heterogeneous material gradient structure connecting joint and a preparation method thereof, and relates to the technical field of material connection. The heterogeneous material gradient structure connecting joint comprises a connecting part, a first base material part and a second base material part, and the connecting part comprises a first gradient structure and a second gradient structure which are mutually embedded; the first base material part is connected to the end, close to the first gradient structure, of the connecting part, the second base material part is connected to the end, away from the first base material part, of the connecting part, the material of the second base material part is the same as that of the second gradient structure, and in the direction, away from the first base material part, of the connecting part, the space density of the first gradient structure is gradually reduced; and the space density of the second gradient structure is gradually increased. According to the heterogeneous material gradient structure connecting joint, structures of different materials can form a gradient transition structure at the connecting part, so that transition of material performance is achieved, sudden change of the materials of the different materials at the connecting part is avoided, the connecting strength of the heterogeneous materials is enhanced, and meanwhile, the invention provides a preparation method of the heterogeneous material gradient structure connecting joint.
Owner:TSINGHUA UNIV

Modification method of nanometer white carbon black

The invention provides a modification method of highly dispersive white carbon black used as rubber filler. An unsaturated carboxylic acid polar monomer and an acrylamide polar monomer are compounded, a conjugated diene monomer is subjected to pre-emulsification treatment, and the highly dispersive white carbon black is prepared with an in-situ polymerization method. With adoption of the method, the problem of easy agglomeration of the nanometer white carbon black is solved, the nanometer white carbon black is endowed with super-dispersibility, the problem of re-agglomeration caused by long-term storage is also solved, and long-term storage stability is guaranteed. The method has the characteristics of being small in consumption of monomers, little in environment pollution, simple to operate, suitable for industrial production and the like.
Owner:PETROCHINA CO LTD
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