64 results about "Ultrasonic scattering" patented technology

The invention discloses a preparation method for a modified diaphragm for a lithium-sulfur battery, the modified diaphragm and the lithium-sulfur battery adopting the modified diaphragm. The preparation method for the modified diaphragm for the lithium-sulfur battery comprises the following steps of mixing a conductive agent with a nano-metal oxide at a mass ratio of 1:1-10:1 to obtain a uniformly-mixed coating material; uniformly mixing the coating material with a binder at a mass ratio of 1:1-5:1, and scattering the mixture into solvent; performing mechanical stirring or ultrasonic scattering to obtain uniformly-dispersed coating slurry; coating the surface of a diaphragm substrate with the obtained coating slurry, and performing vacuum drying to obtain the modified diaphragm for the lithium-sulfur battery. The modified diaphragm for the lithium-sulfur battery prepared by the method can effectively restrain a shuttle effect of polysulfide in a charge/discharge process of the lithium-sulfur battery and prolong the cycle life of the lithium-sulfur battery; and the lithium-sulfur battery adopting the modified diaphragm is high in capacity and good in cycling performance.

The invention discloses nano composite resin dental material used for numerical control forming and the preparation method, which comprises the following composition according to weight account: resin matrix A 25 to 36; resin matrix B 15 to 30; inorganic filler A 30 to 35; inorganic filler B 8 to 15; organic filler 0 to 2; initiator 0.8 to 1.4; reducing agent 0.8 to 1.4; inhibitor 0.01 to 0.05; coloring agent 0.001 to 0.007. The preparation method comprises the following: the resin matrix preparing; the initiation system mixture preparing; inorganic filler mixture preparing; mixed avoiding light, ultrasonic scattering, polymerization solidifying and shaping upon the mixture from the above steps with the organic filler, the inhibitor and the coloring agent. The nano composite resin dental material has the advantages of high density, good wear resistant performance and high hardness and more excellent performance than polymethyl methacrylate artificial tooth and simple preparation method. The preparation method is suitable for dentistry clinical application and popularization.

An ultrasound imaging system for imaging ultrasound scatterers, comprising a probe (208) for transmitting ultrasound waves and detecting ultrasound echoes reflected by said ultrasound scatterers, wherein said probe comprises a first group of transducer elements, labeled transmitting group (T), to transmit ultrasound waves, and a distinct second group of transducer elements, labeled receiving group (R), to detect ultrasound echoes reflected by said ultrasound scatterers. The system also comprises a processing system (202) comprising transmission and reception means, coupled to said probe (208), for providing coded signal to said transmitting group (T) and receiving signals from said receiving group (R) respectively; transmission beam-forming means (103) for focussing the ultrasound waves on a focus line, reception beam-forming means (105) for forming beam-summed received signals from signals received from the focus line and processing means for processing said beam-summed received signals to form decoded signals so as; and means for displaying an image (109) that is a function of said decoded signals.

The invention relates to an ultrasonic scattering coefficient optimal computation method for crack direction recognition, belonging to the field of nondestructive examination. According to the method, an ultrasonic phased array detection system is used for acquiring full-matrix data of a crack defect; firstly, the acquired data are used for performing full-focusing imaging on the defect to determine the position of the defect and then a scattering coefficient space distribution of the crack defect is computed to determine an angle of the crack; the quantity of wafers included in a sub array and the quantity of wafers between adjacent sub arrays greatly affect the measurement precision of the crack angle. A plurality of evaluation indexes are used for evaluating the quantity of a crack angle measurement result according to the quantities of the wafers included in different sub arrays and the wafers between the adjacent sub arrays, and the measurement result is comprehensively evaluated by a main component analysis method to obtain an optimal measurement result; corresponding parameters, namely the quantities of the wafers included in the sub arrays and the quantity of the wafers between the adjacent sub arrays, are optimal detection parameters.

The invention discloses a preparation method for a modified diaphragm for a lithium-sulfur battery, the modified diaphragm and the lithium-sulfur battery adopting multiple layers of the modified diaphragms. The preparation method comprises the following steps of only uniformly mixing a conductive agent with a binder at the mass ratio of 1:1-5:1, then scattering the mixture into solvent; performing mechanical stirring or ultrasonic scattering to obtain uniformly-dispersed coating slurry; coating the surface of a diaphragm substrate with the obtained coating slurry, and performing vacuum drying to obtain the modified diaphragm for the lithium-sulfur battery. The lithium-sulfur battery adopting multiple layers of the modified diaphragms prepared by the method is good in electrochemical performance, low in cost and suitable for industrial production.

The invention provides a preparation method of a graphene-enhanced epoxy resin adhesive, and relates to the preparation method of the epoxy resin adhesive. The preparation method aims at solving the problems that an existing epoxy resin adhesive is small in shearing strength, low in tensile strength, low in elasticity and low in hardness. According to the preparation method, graphene is uniformly dispersed in an epoxy resin matrix through a vacuum drying and ultrasonic scattering method, and the graphene-enhanced epoxy resin adhesive is prepared. The preparation method specifically includes the following steps of firstly, preparing graphene through a chemical oxidoreduction method; secondly, scattering graphene in the epoxy resin matrix; thirdly, preparing a graphene-enhanced epoxy resin adhesive connector. Compared with pure epoxy resin, the preparation epoxy resin adhesive is more excellent, easy to operate, low in cost, environmentally friendly, high in bonding strength, and more beneficial for being applied to fields with high requirements for the bonding technology.

A method of detecting cellular damage within a subject comprises transmitting low frequency ultrasound (20 MHz or below) into a selected site within the subject wherein the selected site has been exposed to a stress capable of causing cellular death at the selected site. At least a portion of ultrasound backscattered from the ultrasound transmitted into the selected site is received. The received backscattered ultrasound is compared to a control backscatter measurement. An increase or a decrease in intensity or spectral slope of the received backscattered ultrasound when compared to the control backscatter measurement indicates cellular death or damage at the selected site within the subject.

The invention relates to a liquid metal nanoparticles with a core-shell structure and a preparation method thereof. According to the liquid metal nanoparticles with the core-shell structure, the liquid metal is mixed with a high-viscosity organic material, after ultrasonic scattering, fine liquid which is uniformly dispersed on the upper layer is taken out, and continuously carrying out ultrasonicscattering, until the liquid metal nanoparticles with the core-shell structure are prepared. According to the method, the liquid metal nano-particles is prepared, the particle size is small, the sizedistribution is centralized, the preparation process is simple, fast and efficient, the cost is low, the implementation is easy, the prepared nano-particles can stably exist and still have no obviousagglomeration and sedimentation after being placed for more than 100 days, so that a good foundation for material preparation is provided for application of the liquid metal nano-particles.

A treatment instrument system according to the present invention includes: an endoscope having a treatment instrument channel; an ultrasound probe inserted through the treatment instrument channel of the endoscope; an ultrasound observing apparatus having a blood flow display function and a distance measuring function; a treatment instrument having, at a distal end portion, an ultrasound scattering portion for scattering ultrasound; and an over tube having an endoscope insertion path through which the endoscope can be inserted and a treatment instrument insertion path through which the treatment instrument can be inserted, and having, at a distal end portion, an ultrasound scattering portion for scattering ultrasound.

The invention discloses a method for measuring absolute stress of concrete under uniaxial stress by applying an ultrasonic scattering wave method. The method comprises the following steps: firstly, providing a standard concrete test block which is consistent with a to-be-tested concrete member, and performing an ultrasonic scattering wave test in a first loaded mode; secondly, drawing original waveform diagrams in various load states and a relationship curve of scattering wave travel-time difference change rate and stress; thirdly, performing the ultrasonic scattering wave test on the to-be-tested concrete member in a second loaded mode, wherein the second loaded mode is contained in the first loaded mode; fourthly, drawing original waveform diagrams of the to-be-tested concrete member in various load states and a relationship curve of the scattering wave travel-time difference change rate and the stress; fifthly, finding the initial position of the relationship curve of the scattering wave travel-time difference change rate and the stress of the to-be-tested concrete member on the curve of the standard concrete test block, wherein the stress value corresponding to the initial position is the absolute stress. The method can evaluate the absolute stress of the to-be-tested concrete member.

The invention discloses a preparation method of magnetic sepharose gel microspheres. The preparation method comprises the following steps: (1) preparing ferrous powder with scattered active agent: adding the ferrous powder into surface active agent water solution, heating and mechanically stirring; washing and drying the obtained product to obtain the ferrous powder with scattered active agent; and (2) preparing the magnetic sepharose gel microspheres: dissolving an emulsifying agent span80 into liquid paraffin for preheating; taking sepharose gel and the ferrous powder with scattered active agent, adding secondary distilled water to prepare sepharose solution, conducting ultrasonic scattering and heating and dissolving; adding the dissolved sepharose solution into span80-containing liquid paraffin solution; after the reaction is finished, cooling a sample and conducting slow and mechanical stirring; separating the sample, and washing to obtain the magnetic sepharose gel microspheres. By adopting a reversed phase suspension embedding method, the prepared magnetic sepharose gel microspheres are strong in magnetic responsibility, and have a good effect on the separation and purification of protein.

The invention aims to provide a new method for ultrasonic flaw detection of a pressure-bearing cast iron device, namely a grain characteristic-based improved split spectrum method in ultrasonic flaw detection of the pressure-bearing cast iron device, wherein compared with a conventional cast iron flaw detection, the method enables a system to obtain higher signal-to-noise ratio, faster response time and higher flexibility. Because an internal organizational structure of cast iron is not uniform and the grain size is larger, when ultrasonic waves are used for flaw detection, attenuation of the ultrasonic waves is larger when in propagation, sporadic reflection is prone to generate, and forest-like or grass-like echoes are produced, resulting in poor flaw detection sensitivity. The method utilizes effects of an average grain size and an crystal orientation angle (an included angle of the acoustic wave incident direction and the grain axis) of the cast iron internal grain characteristics on ultrasonic scattering and attenuation, a noise time-frequency characteristic and a flaw echo frequency dispersion characteristic with obvious grain characteristics are caused, optimized split spectrum parameters are obtained through analysis of noise and echo signals, and thus with utilization of the split spectrum technology, the scattering noise can be well reduced and the ultrasonic echo signal sensitivity can be well improved.

The invention discloses an ultrasonic non-destructive characterization method for the structure uniformity of a non-uniform medium, and belongs to the technical field of ultrasonic non-destructive detection and evaluation of materials. Directed at the problems of complex ultrasonic scattering mechanism and difficulty in effective decoupling of tissue uniformity information caused by multiphase, nonhomogeneity, irregular scatterer morphology and large size change range in the ultrasonic non-destructive characterization process of the structure uniformity of the non-uniform medium, the ultrasonic non-destructive characterization method for the structure uniformity of the non-uniform medium adopts the ultrasonic pulse echo technology, and combines wavelet transform multi-scale analysis and asupport vector regression machine learning algorithm for non-destructive characterization on the non-uniform medium structure uniformity. The characterization method has the advantages of easy implementation, high robustness, high characterization precision and the like, overcomes the limitation that a traditional fitting method and a regularization method are difficult to deal with complex nonlinearity and ill-posedness problems of a physical mechanism, and has good application and popularization prospects.

The invention discloses a cyclic multistage ultrasonic disperse method, wherein the invention serially connects multistage ultrasonic dispersers with different powers and frequencies, continuously pumps the mixed liquid in a liquid groove into an inlet of a first-stage ultrasonic disperser, and feeds the mixed liquid dispersed by the first-stage ultrasonic dispersers into a second-stage and a third-stage ultrasonic dispersers via the pressure of pump to be dispersed, and the invention processes aforementioned steps to realize multistage ultrasonic disperse until reaching preset disperse demand. The invention can break the accumulated slag in fuel oil into uniform ones, and reduce energy consumption via high-efficiency cyclic multistage ultrasonic disperser, with small volume, simple maintenance and high disperse efficiency.

The present invention provides an acceleration and enhancement methods for ultrasound scatterer structure visualization. The method includes: obtaining an ultrasonic image, calculating all values of the ultrasonic signal points in each m^th window centered at a n^th signal point to obtain a plurality of original statistical values a_nx_m, obtaining a plurality of m^th statistical values by averaging value of original statistical values in the same window, calculating a plurality of m^th weighting values based on the statistical values by different weighting formulas, multiplying each weighting value with the original statistical values corresponding to the various size of windows, summing up to obtain an ultrasound structure scatterer value of the n^th ultrasonic signal point, and generating an ultrasound scatterer structure image based on a matrix of the ultrasound scatterer values. The present invention further combined interpolation method can reduce the computation time and retain the 80% accuracy.

The invention provides a defect classification method and system based on ultrasonic phased array imaging, and belongs to the field of nondestructive detection.The method comprises the steps that ultrasonic phased array imaging is adopted for a to-be-detected sample piece to obtain ultrasonic full-matrix data; performing full-focusing processing on the ultrasonic full-matrix data, performing color coding according to the signal amplitude, and obtaining an image of the sample piece to be detected; preprocessing an image of a to-be-detected sample, inputting the preprocessed image into the classification prediction model, and obtaining defect classification of the to-be-detected sample; a method for training the classification prediction model comprises the following steps of: acquiring simulation data by simulating ultrasonic phased array imaging by utilizing a defect ultrasonic scattering data finite element simulation method; after full-focusing processing is carried out on the simulation data, a simulation image is obtained; preprocessing the simulation image and then performing data enhancement; carrying out image feature extraction on the simulation image by adopting a convolutional neural network; and inputting the image features into a full connection layer, and training a classification prediction model by taking defect classification as output. According to the invention, the accuracy of defect classification is improved.

The present application discloses an ultrasonic measurement system and a detection method for detecting deep structural fissures. By utilizing the detection method, the size of a deep sub-wavelength-scale linear micro-fissure of a material can be quantitatively detected. After being excited by ultrasonic pulses, the micro-fissure deep in the material can generate ultrasonic scattering and reflection; after being received by an ultrasonic transducer, ultrasonic signals pass through a signal amplifier and an analog-to-digital converter and are stored in a computer; and a power spectrum of the ultrasonic signals is obtained by computing. A spectrum parameter, namely a power spectrum slope, can be obtained by carrying out linear fitting on low-frequency bands of the power spectrum, the spectrum slope and the diameter of the micro-fissure are in one-to-one correspondence, and the diameter of the sub-wavelength micro-fissure can be quantitatively evaluated by computing the slope. Because the quantitative detection method needs a low working frequency, the method provides a non-invasive, non-ionizing, cheap and safe method for evaluating the scale of the deep micro-fissure.

The invention discloses a high-heat-conduction-performance graphene metal composite multi-layer radiator and a preparing method thereof, and belongs to the technical field of heat dissipation. The radiator comprises a metal base layer, a graphene film layer evenly deposited on the surface of the metal base layer, and a welding part. The preparing method of the high-heat-conduction-performance graphene metal composite multi-layer radiator comprises the following steps that graphene powder and an additive are added in an absolute ethyl alcohol solution, and evenly-scattered graphene dispersion liquid is obtained through ultrasonic scattering; equal-thickness strip-shaped metal sheets are adopted and subjected to surface treatment through dilute nitric acid, deionized water, absolute ethyl alcohol and ultrasonic waves, and then the equal-thickness strip-shaped metal sheets serve as a cathode; the cathode and an anode are jointly immersed in the graphene dispersion liquid to be subjected to electrophoretic deposition; then after the metal base layer is tightly rolled into a multi-layer cylinder from one end, the other end of the metal base layer is welded and fixed to the outer side of the cylinder to be subjected to annealing treatment, and the cake-shaped graphene metal composite multi-layer radiator is formed through cutting in the direction perpendicular to the axial direction of the cylinder. The radiator is high in heat dissipation efficiency, the technology is simple, energy saving and environment friendliness are achieved, cost is low, and the heat dissipation efficiency is high.

The invention discloses a process and a device for efficiently treating mixed raw material biogas slurry. The process for efficiently treating the mixed raw material biogas slurry comprises the following steps: S1, primary filtration; S2, ultrasonic scattering; S3, primary dosing and flocculation; S4, secondary dosing and flocculation; S5, efficient air flotation; and S6, efficient filter pressing. The device for the process for efficiently treating the mixed raw material biogas slurry comprises a grille dirt cleaner, an ultrasonic generator, a doser, an air floater and a filter press, wherein the output end of the ultrasonic generator is connected with the water inlet of the air floater through a dosing pipeline, the doser is communicated with the middle of the dosing pipeline through a first branch, and the doser is communicated with the dosing port of the air floater through a second branch. According to the invention, the diameter of suspended matter particles in the treated biogas slurry is controlled to be 63 microns or below, the indexes of the biogas slurry meet the requirements of various indexes of NY/T2596-2014 biogas manure, the requirement for using the biogas slurry by using a drip irrigation pipe network is met, and the national call about drip irrigation development is complied with.

The invention relates to a preparing method for an aluminum base graphene and carbon nano tube composite heat dissipation material, and belongs to the technical field of heat dissipation material preparing. The method comprises the steps that equivalent graphene, carbon nano tube powder and aluminum salt are added in an absolute ethyl alcohol solution, and evenly-scattered graphene and carbon nano tube mixed electrophoresis liquid is obtained through ultrasonic scattering; and after being subjected to surface treatment through dilute nitric acid, deionized water, absolute ethyl alcohol and ultrasonic waves, aluminum base sheets serve as a cathode; graphite sheets serve as an anode, and the cathode and the anode are immersed in the mixed electrophoresis liquid to be subjected to electrophoretic deposition; then, the aluminum base sheets are stacked into multiple layers from one end, cold press forming is conducted, the other ends of the aluminum base sheets wrap the outer face of a pressed and formed sample by one circle, and the other ends of the aluminum base sheets are welded and fixed to the side face of the sample; and annealing treatment is conducted at the nitrogen atmosphere, and accordingly the aluminum base graphene and carbon nano tube composite heat dissipation material is obtained. According to the method, the technology is simple, energy saving and environment friendliness are achieved, cost is low, and the prepared composite heat dissipation material is high in heat dissipation efficiency and high in mechanical strength.

A turbidity measurement device for measuring turbidity of a fluid flowing in a flow tube. A first transducer transmits ultrasonic signals through the fluid in the turbidity measurement section so as to provide a first ultrasonic standing wave between the first and second section ends. A receiver transducer receives the ultrasonic scattered response from particles in the fluid flowing through the turbidity measurement section. A control circuit operates the transducers and generates a signal indicative of the turbidity of the fluid in response to signals received from the receiver transducer. Preferably, the device may comprise a second transducer for generating a second ultrasonic standing wave with the same frequency, and further the two transducers may be used to generate a measure of flow rate by means of known ultrasonic techniques. This flow rate may be used in the calculation of a measure of turbidity. Both turbidity facilities and flow rate facilities may be integrated in a consumption meter, such as a heat meter or a water meter.

The invention discloses a system and a device for positioning damage of an HDPE (High-Density Polyethylene) film of a refuse landfill. The system and the device utilize the scattering characteristic of ultrasonic waves. By means of wave piezoelectric patches laid on the upper surface of a to-be-detected area of an HDPE film in a regular plane geometry mode, a wave piezoelectric patch generator controls half of the piezoelectric patches to generate ultrasonic waves in a self-excited oscillation mode, and preferably, in order to prevent mutual interference of detection systems, the piezoelectric patches on the designated opposite sides receive ultrasonic signals. Scanning is completed according to the process, an analog quantity damage signal is obtained, time-energy density characteristics are extracted through analog-to-digital conversion and wavelet analysis, damage positioning is achieved by combining probability imaging according to the energy density difference when damage exists or not, a damage alarm is given out through system control, and the damage position can be displayed. The system can solve the problems that an existing naked film detection method is low in timeliness, gas leaks, and the manual workload is large, active detection of the HDPE film is achieved through the vibration inducing piezoelectric plate, and the omission ratio is effectively reduced.