31 results about "Ultrasonic absorption" patented technology

The invention provides a compound cesium fluoborate, a nonlinear optical crystal with the cesium fluoborate, methods for preparing the compound cesium fluoborate and the nonlinear optical crystal and application of the compound cesium fluoborate and the nonlinear optical crystal. A chemical formula of the compound is CsB<4>O<6>F, the molecular weight of the compound is 291.15, and the compound is of a crystal structure and is prepared by the aid of solid-phase synthesis processes or vacuum packaging processes. A chemical formula of the nonlinear optical crystal is CsB<4>O<6>F, the molecular weight of the nonlinear optical crystal is 291.15, the nonlinear optical crystal belongs to orthorhombic crystal systems, space groups of the nonlinear optical crystal are Pna2<1>, crystal cell parameters of the nonlinear optical crystal include that an a is equal to 7.9241 , a b is equal to 11.3996 , a c is equal to 6.6638 and an alpha, a beta and a gamma are equal to 90 degrees, and the unit cell volumes of the nonlinear optical crystal are 601.95 <3>. Frequency doubling effects of the nonlinear optical crystal is approximately two times frequency doubling effects of KH<2>PO<4> [KDP (potassium dihydrogen phosphate)], and ultrasonic absorption edges of the nonlinear optical crystal are shorter than 190 nm. The nonlinear optical crystal is grown from the CsB<4>O<6>F by the aid of melt processes, high-temperature solution processes, vacuum packaging processes, hydrothermal processes or room-temperature solution processes. The compound cesium fluoborate, the nonlinear optical crystal, the methods and the application have the advantages that the nonlinear optical crystal is free of deliquescence in air, is good in chemical stability and can be applied to all-solid-state laser devices as an ultraviolet nonlinear optical crystal or deep ultraviolet nonlinear optical crystal.

The present invention discloses a research system for delaying transition of high-supersonic-velocity boundary layer material, comprising: an ultrasonic absorption layer model; an ultrasonic generator arranged on one side of the ultrasonic absorption layer model; and a pressure sensor arranged on the other side of the ultrasonic absorption layer model for receiving echoes. The invention also discloses an experimental research method for delaying transition of high-supersonic-velocity boundary layer material, and the method enables effective application of the research system for delaying transition of high-supersonic-velocity boundary layer material to carry out research on the impact of ultrasonic absorption layer geometry upon wave absorption characteristics of the material; the invention also provides a method for capturing acoustic resonance mode in the high-supersonic-velocity boundary layer material, and the method is used for validating existence of the acoustic resonance mode to to provide comprehensive experimental support and scientific basis for the design of ultrasonic absorption layers.

The invention discloses a multi-parameter integrated COD (Chemical Oxygen Demand) water quality monitoring system comprising a wireless transmission system (2), a monitoring terminal (3) arranged far away from the water area to be monitored and in the monitoring room, and at least one multi-parameter induction terminal (1) that is arranged at the water area to be monitored; each multi-parameter induction terminal (1) is wirelessly connected with the inlet end of the wireless transmission system (2); and the outlet end of the wireless transmission system (2) is wirelessly connected with the monitoring terminal (3). The invention also provides a method which utilizes the monitoring system to carry out the multi-parameter integrated COD water quality monitoring. The method comprises the steps of 1) monitoring the following four parameters of the water area to be monitored by the multi-parameter induction terminal (1): ultrasonic absorption, turbidity, temperature and pH value; 2) transmitting the four parameters to the monitoring terminal (3) through the wireless transmission system (2) by the multi-parameter induction terminal (1); and carrying out the calculation by the monitoring terminal (3).

The invention discloses a parallel dense multichannel acousto-optical modulating device. The device adopts the structure that a laser bar, a fast axis alignment cylindrical mirror, a slow axis alignment cylindrical mirror, a focusing lens, a filed lens, an acousto-optical modulating crystal, an occluder, an imaging lens assembly and an imaging medium are arranged on an optic axis of an identical device in sequence; misplug-type ultrasonic transducers are arranged on the upper side of the acousto-optical modulating crystal along the direction of the optical axis of a same crystal; and an ultrasonic absorption end is arranged at the lower side of the acousto-optical modulating crystal along the direction of the optical axis of a same crystal. The optical axis of the acousto-optical modulating crystal and the optical path of the optical axis of the device can be superposed or form an angle of 10 to 15 degrees. The occluder can be an occluder with a non-light tight center, or with two light tight sides, or with a light tight center and two non-light tight sides. The device ensures that the output laser has high power, is dense, and has multi channels; the consistency of the beam is good, the optical paths are parallel and easy for further collimation and focusing, and the modulating array can be better applied to CTP, laser photo-typesetting and laser drawing systems.

The invention discloses a method and a system for expanding a receiving angle and distance of an ultrasonic signal and an infrared signal, and is characterized in that a novel ultrasonic omnidirectional receiver, an interference ultrasonic absorption device / structure and a device which expands the receiving range of the infrared signal by an infrared lens are designed into an ultrasonic and infrared distance measurement or positioning system; and the structural combination of the devices can also be carried out so as to obtain the omnidirectional ultrasonic receiver with large receiving range and effective anti-interference.

The invention discloses a high-pressure water tank formation device and a high-pressure water tank formation method for a polymer-based carbon fiber composite material. The device comprises a high-pressure water tank, a control system, a silicon rubber container, an ultrasonic transmitter, a numerical control servo mechanism, a vacuum bag, a gas suction pipe, a thermocouple signal wire, a thermocouple, a vacuum pump and a high-pressure gas boosting pump. The method comprises the following steps of: arranging the vacuum bag filled with a blank into the silicon rubber container, and positioning; fully filling ultrasonic absorption liquid which is subjected to degassing treatment into the silicon rubber container, and sealing; putting the sealed silicon rubber container into the high-pressure water tank, and closing; injecting deionized water at the same time; and controlling the ultrasonic transmitter to scan and irradiate the ultrasonic absorption liquid through a main control circuit,so that the polymer-based carbon fiber composite material blank is cured and formed at the temperature under the pressure. The method has a relatively independent high-temperature high-pressure environment and is high in thermal efficiency and low in energy consumption; and the device has a simple structure.

The invention discloses a high-density multi-channel acousto-optic modulation device. In the device, a laser bar, a fast axis collimation cylindrical mirror, a slow axis collimation cylindrical mirror, a focusing lens, a field lens, an acousto-optic modulation crystal and a light barrier are arranged on the main optical axis in sequence, wherein a secondary optical axis is formed at an included angle position of between 20 and 30 degrees of the main optical axis through the acousto-optic modulation crystal; a shutter, an image lens group and an image medium are sequentially arranged on the secondary optical axis; and an intersection type ultrasonic transducer and an inter-digital electrode are arranged at one end of the acousto-optic modulation crystal, and an ultrasonic absorption end is arranged at the other end of the acousto-optic modulation crystal. The light transmission area of the shutter is of a rectangular shape, the shutter is open when a shutter switch signal is triggered, and otherwise the shutter is closed. The high-density multi-channel acousto-optic modulation device ensures that the output laser has high density and multiple channels, laser modulation over 256 paths can be easily realized, the light beam has good consistency, the light paths are parallel to facilitate further collimation and focusing, and the modulation array can be well applied to computer to plate (CTP), laser image setting and laser light printing systems.

The invention discloses a water-soluble ultraviolet absorbent with reactive groups and a synthesis method of the absorbent, and belongs to the technical field of functional agent and chemical engineering. With ultrasonic absorbent such as cyanuric chloride and UV-0 and carbohydrate such as diacetone-D-glucose as the raw materials, the water-soluble ultraviolet absorbent with the reactive groups is synthesized through three-step reaction. The three-step synthesis process includes the steps of firstly, n cyanuric chloride, n diacetone-D-glucose and n NaOH react for 8 h in mixed liquid of acetone and water at 0 DEG C according to the ratio of n cyanuric chloride to n diacetone-D-glucose to n NaOH being 0.9:1:1.7; secondly, n intermediate, n UV-0 and n NaOH react for 2 h in mixed liquid of acetone and water at 30 DEG C according to the ratio of n intermediate to n UV-0 to n NaOH being 1:1.1:1; thirdly, the product (1 mmol) obtained in the second step and 0.5 mL of hydrochloric acid react for 5 h at 25 DEG C in THF. The synthesis method is easy and convenient to operate and easy to implement. The ultrasonic absorbent is excellent in ultrasonic absorption performance and good in water solubility and can be applied to ultrasonic resistant modification of cotton, wool and other textile materials. Organic solvent can be prevented from being used in application, and the application prospects are wide.

The invention relates to a microfluidic chip device for multi-channel simultaneous detection of six typical tumor markers, which belongs to the field of analysis and testing. Using polydimethylsiloxane (PDMS) to make the substrate of the microfluidic chip for multi-channel joint detection of six typical tumor markers has obvious advantages, but there are also a series of problems; this case is aimed at this series of problems. The gist of this case is that the PDMS with an original ecological surface is selected as the substrate, and a micro-ultrasonic transducer is attached and installed in the vicinity of the liquid flow terminal of the microfluidic chip to reduce the interfacial tension with ultrasonic waves, thereby greatly increasing the correlation. The compatibility between the phases and the strong absorption ability of PDMS to ultrasonic waves are used to achieve a rapid decrease in the ultrasonic intensity within a short distance, and thus form a difference in interfacial tension at both ends of the chip, which leads to the difference in interfacial tension between the two A pressure differential is formed at the end of the pipe, which drives the flow toward the terminal along the otherwise strongly hydrophobic pipe.

This case involves a special sound-absorbing and anti-corrosion rubber for ultrasonic devices, including: 40-45wt% fluorine rubber, 2-3wt% vulcanizing agent, 10-12wt% modified glass fiber, 5-8wt% tungsten carbide powder, and 5-8wt% hollow glass microspheres 10wt%, mica powder 10-15wt%, vinyl silicone resin 10-15wt%, anti-aging agent 2-3wt% and plasticizer 2-3wt%; the special sound-absorbing and anti-corrosion rubber for ultrasonic devices of the present invention not only has good corrosion resistance, Wear-resistant and sealing, with excellent ultrasonic absorption performance, suitable for lining board, outer cladding, sealing ring material with ultrasonic function device.

The invention relates to a micro-fluidic chip device adopting coupling operation of two drive modes for syphilis diagnosis and belongs to the field of analysis and testing. Aiming at solving the problems caused by adoption of cheap and easy-to-process PDMS (polydimethylsiloxane) for manufacturing a substrate of a micro-fluidic chip for syphilis diagnosis, the scheme is characterized in that the substrate adopts PDMS with an original surface, a miniature ultrasonic transducer is fixedly mounted in the position adjacent to a sample liquid flow terminal of the micro-fluidic chip, interfacial tension is reduced through ultrasonic waves, meanwhile, the ultrasonic intensity is reduced progressively and rapidly in a short distance on the basis of high ultrasonic absorption capacity of PDMS, so that interfacial tension difference is formed between two ends of the chip, and power for driving sample liquid flow to flow towards the terminal along a hydrophobic capillary channel is provided by the difference and is mutually supported, mutually coupled, mutually adjusted and mutually cooperative with mechanical pumping power of a micropump in the structure simultaneously.

The invention provides a touch screen positioning device. The touch screen positioning device comprises a screen frame, wherein the screen frame is arranged on a touch screen in a sleeved mode, and the surface of the inner side of the screen frame contains a layer of ultrasonic absorption material. The touch screen positioning device further comprises at least one ultrasonic detection device, wherein the ultrasonic detection device is arranged on one of the top points of the touch screen in a rotatable mode, the ultrasonic detection device is connected with a control system of the touch screen, and the control system is used for obtaining the coordinate of a touch point according to the touch point distance detected by the ultrasonic detection device and the rotating angle of the ultrasonic detection device. The invention further provides a touch screen positioning method, and according to the touch screen positioning method, the super-large touch screen can be rapidly positioned, and the cost is low.

The invention relates to a boiler liquid level meter based on ultrasonic ranging. The boiler liquid level meter is characterized by further comprising a main control module, an ultrasonic ranging module and an anti-interference module; the ultrasonic ranging module is arranged on the top of a boiler inner container; the anti-interference module is arranged on the bottom face of the boiler inner container; the anti-interference module and the ultrasonic ranging module are oppositely arranged; the main control module is electrically connected with the ultrasonic ranging module; the anti-interference module comprises an ultrasonic wave absorption module, and the ultrasonic wave absorption module absorbs sound waves penetrating through the liquid level to reach the bottom face of a boiler. The liquid level is intelligently read through the ultrasonic ranging module, a touch screen displays the liquid level in real time and can adjust and control the liquid level in real time, workers can conveniently master the condition of the boiler in real time, and the intelligent degree is high. The liquid level height integrates liquid level fluctuation compensation and temperature compensation, so that the accuracy of ultrasonic ranging reading is improved. The anti-interference module absorbs the sound waves penetrating through the liquid level to reach the bottom face of the boiler, interference caused by the sound waves reflected by the bottom face in the boiler is reduced, and the accuracy of the ultrasonic ranging reading is improved.

The invention relates to a continuous preparation method and application of high-elasticity electric-conductive fiber years. The electric-conductive nano-fiber yarns are composed of carbon nano tubes and TPU elastic nano-fiber yarns. According to the invention, an electrostatic spinning device is applied at first, and water bath is used for collection, so the continuous TPU elastic nano-fiber yarns could be prepared. For the purpose of making the nano-fiber yarns electrical-conductive, the fiber yarns are made to absorb carboxylation MWNTs and then absorb unmodified SWNTs through ultrasonic absorption. Two types of carbon tubes could react with a substrate and could react with each other, so the continuous elastic nano-fiber yarns with high electric conductivity is prepared. The elastic yarns have higher electric conduction performance than fiber yarns prepared through separate absorption of the MWNTs and SWNTs. The yarns are characterized by high elasticity, high electric conductivity, stretchability, linear knitting performance and so forth; and the yarns have extensive potential application in wearable electronic devices and have bright application prospect in fields such as electromagnetic shielding, static resistance, sensors and flexible energy devices.

The invention relates to a microfluidic chip device depending on interphase interface characteristics to achieve sample fluid transfer, which belongs to the field of analytical testing. In practice, certain problems exist in using cheap and extremely easy-to-process polydimethylsiloxane (PDMS) to produce a substrate of a microfluidic chip. The microfluidic chip device is characterized in that PDMS with the original surface is chosen by the substrate, ducts of a chip are filled up with micron-sized silicon dioxide particle filler, and the functions of the filler include supporting the internal walls of the ducts, using a set of hydrophilic microchannels to compensate original hydrophobic ducts and squeezing and covering the internal wall surfaces of the ducts in order to reduce the chance of contact between biomacromolecules and the internal wall surfaces; a miniature ultrasonic transducer is mounted on a terminal of the chip in an attaching manner, the strong ultrasonic absorption of the PDMS is utilized to rapidly decrease ultrasonic intensity within a short distance, thereby an interface tension difference is induced to be formed at both ends of the chip, and sample fluid is then promoted to flow in a direction toward the terminal along the ducts of the chip.

The invention discloses micro-power supply used inside human body, which comprises a rubber capsule, a rubber column, a stainless steel tube, a film thermocouple, a thermoelectric micro-generator, a wireless launcher, a signal processing system and electrodes; wherein, the rubber column and the rubber capsule are bound together by rubber cement; the stainless steel tube is sleeved outside the rubber column; the inner chamber of the rubber capsule is full of ultrasonic absorption coefficient liquid; the hot end of the film thermocouple penetrates the rubber capsule to soak into the ultrasonic absorption coefficient liquid, while the cold end is arranged in the rubber column; the hot end of the thermoelectric micro-generator penetrates the rubber capsule to soak into the ultrasonic absorption coefficient liquid, while the cold end is positioned in the rubber column; the wireless launcher and the signal processing system are both encapsulated in the rubber column, and sending antenna of the wireless launcher is welded on the stainless steel tube. The micro-power supply of the invention has the advantages of small volume, simple structure, and low cost, and ultrasound is safe to human body.

The invention relates to a microfluidic chip device for combined detection of typical tumor markers suitable for men, belonging to the field of analysis and testing. Using polydimethylsiloxane (PDMS) to make the substrate of the microfluidic chip for the combined detection of typical male tumor markers has many advantages, but there are also a series of problems; this case is aimed at this series of problems. The gist of this case is that the PDMS with an original ecological surface is selected as the substrate, and a micro-ultrasonic transducer is attached to the position adjacent to the sample liquid flow terminal of the microfluidic chip, so that the interfacial tension is reduced by ultrasonic waves, and the correlation is greatly increased. The compatibility between the phases and the strong absorption ability of PDMS to ultrasonic waves are used to achieve a rapid decrease in the intensity of ultrasonic waves in a short distance, and thus form a difference in interfacial tension at both ends of the chip, which leads to the difference in interfacial tension between the two A pressure difference is formed at the end, and the pressure difference drives the sample liquid flow to flow along the originally hydrophobic pipe toward the terminal. The device also eliminates the need for a micropump.

This case involves an anti-corrosion rubber that can isolate ultrasonic waves, including: 40-45wt% of fluororubber, 2-3wt% of vulcanizing agent, 2-3wt% of glass fiber, 5-8wt% of tungsten carbide powder, and 15-wt% of modified hollow glass beads 20wt%, mica powder 10-15wt%, vinyl silicone resin 10-15wt%, antioxidant 2-3wt% and plasticizer 2-3wt%; the anti-corrosion rubber capable of isolating ultrasonic waves not only has good anti-corrosion, It has excellent wear resistance and sealing performance, and has excellent ultrasonic absorption performance. It is suitable for lining, outer coating and sealing ring materials with ultrasonic functional devices.

The invention discloses a water-soluble ultraviolet absorbent with reactive groups and a synthesis method of the absorbent, and belongs to the technical field of functional agent and chemical engineering. With ultrasonic absorbent such as cyanuric chloride and UV-0 and carbohydrate such as diacetone-D-glucose as the raw materials, the water-soluble ultraviolet absorbent with the reactive groups is synthesized through three-step reaction. The three-step synthesis process includes the steps of firstly, n cyanuric chloride, n diacetone-D-glucose and n NaOH react for 8 h in mixed liquid of acetone and water at 0 DEG C according to the ratio of n cyanuric chloride to n diacetone-D-glucose to n NaOH being 0.9:1:1.7; secondly, n intermediate, n UV-0 and n NaOH react for 2 h in mixed liquid of acetone and water at 30 DEG C according to the ratio of n intermediate to n UV-0 to n NaOH being 1:1.1:1; thirdly, the product (1 mmol) obtained in the second step and 0.5 mL of hydrochloric acid react for 5 h at 25 DEG C in THF. The synthesis method is easy and convenient to operate and easy to implement. The ultrasonic absorbent is excellent in ultrasonic absorption performance and good in water solubility and can be applied to ultrasonic resistant modification of cotton, wool and other textile materials. Organic solvent can be prevented from being used in application, and the application prospects are wide.

The invention relates to a simple chip device convenient to disassemble and assemble and used for joint inspection of typical tumor markers, and belongs to the field of analytical test. PDMS (polydimethylsiloxane) has advantages and also has to-be-solved series of problems when used for producing a substrate of a micro-fluidic chip for multichannel joint detection of the typical tumor markers. Aiming at the series of problems, the scheme is characterized in that PDMS with an original surface is selected as the substrate, a hinge fixture to which a miniature ultrasonic transducer is attached is manually fastened and positioned in the position near a sample liquid flow terminal of the micro-fluidic chip, interfacial tension is reduced by ultrasonic waves, so that the interfacial compatibility of relevant solid and liquid phases is improved remarkably, meanwhile, the ultrasonic intensity decreases rapidly within a short distance by means of the strong ultrasonic absorption capacity of PDMS, interfacial tension difference is formed between two ends of the chip, and sample liquid flow is promoted to flow in the terminal direction along the originally hydrophobic capillary tube channels. The device does not need a micropump.

The invention relates to a cheap AIDS (Acquired Immune Deficiency Syndrome)-diagnosing microfluidic device transferring fluid in a new way, which belongs to the field of analytical testing. Technical obstacles exist in using cheap and extremely easy-to-process polydimethylsiloxane (PDMS) to produce a substrate of an AIDS-diagnosing microfluidic chip. The cheap AIDS-diagnosing microfluidic device is characterized in that PDMS with the original surface is chosen by the substrate, ducts of a chip are filled up with micron-sized silicon dioxide particle filler, and the functions of the filler include supporting the internal walls of the ducts, using a set of hydrophilic microchannels to compensate original hydrophobic ducts and squeezing and covering the internal wall surfaces of the ducts in order to reduce the chance of contact between biomacromolecules and the internal wall surfaces; a miniature ultrasonic transducer is mounted on a terminal of the chip in an attaching manner, the strong ultrasonic absorption of the PDMS is utilized to rapidly decrease ultrasonic intensity within a short distance, thereby an interface tension difference is induced to be formed at both ends of the chip, and sample fluid is then promoted to flow in a direction toward the terminal along the ducts of the chip.

The invention relates to an additional subtype swine influenza detection device used for driving liquid flow and provided with easy-to-dismount components and belongs to the field of analysis and testing. The scheme aims to solve related problems that a series of difficulties actually exist when cheap and easy-to-process polydimethylsiloxane (PDMS) is utilized to prepare a micro-fluidic chip for subtype swine influenza diagnosis, and the effect of targeted surface modification or surface finish is difficult to last due to strong hydrophobicity of the surface of a PDMS material. The scheme is characterized in that the substrate adopts PDMS with an original surface, an elastic clamp with clamping arms equipped with attached miniature ultrasonic transducers is elastically snapped and located in the position adjacent to a sample liquid flow terminal of the micro-fluidic chip, interfacial tension is reduced by the aid of ultrasonic waves, meanwhile, the ultrasonic intensity is reduced progressively and rapidly in a short distance on the basis of high ultrasonic absorption capacity of PDMS, so that interfacial tension difference is formed at two ends of the chip, and the sample liquid flow is enabled to flow in a direction of the terminal along a capillary channel.

The invention discloses a preparation method of a sterilization material employing loofah sponge as a matrix. The method comprises the steps of adding chitosan to deionized water under an intense stirring state, dropwise adding glacial acetic acid for assisting in dissolution, hydrolyzing at room temperature for 4-8h, heating in a water bath at 50-70 DEG C, slowly dropwise adding a silver nitrate solution and heating to 75-85 DEG C for constant-temperature reaction for 10-14h to obtain a gold nano silver colloidal solution; peeling and denucleating loofah fruits, cleaning and drying, soaking the loofah in sodium hydroxide and triethylamine, and repeatedly cleaning until the pH is 7 to obtain modified loofah sponge; and soaking the modified loofah sponge into the nano silver colloidal solution, carrying out ultrasonic absorption as an assistant means, drying and repeatedly cleaning until no silver is washed out, and drying again to obtain the sterilization material. According to the method, the strong adsorption effect of the loofah sponge on an organic matter is skillfully utilized and the nano silver material is uniformly deposited on the wall of a vascular bundle of the loofah sponge; the preparation method is simple and easy to operate; and the prepared product is of an overall material, is easy to use, store and popularize, and is safe and nontoxic.

The invention discloses electronic equipment, and belongs to the field of communication equipment. The electronic equipment comprises a first structural part which is provided with a first surface and a second surface which are opposite and are arranged in parallel, and a thickness detection device facing the second surface. A propagation part of the thickness detection device is provided with a third surface and a fourth surface which are opposite and arranged in parallel, the third surface is attached to the second surface, the propagation part comprises a conduction sub-part and an isolation sub-part arranged around the conduction sub-part, and the ultrasonic absorption coefficient of the isolation sub-part is larger than the ultrasonic absorption coefficient of the conduction sub-part. A first end face of the conduction sub-part is located on the third surface, a second end face is located on the fourth surface, and an ultrasonic transmitting part and an ultrasonic receiving part of the thickness detection device are attached to the second end face. The electronic equipment can solve the problem that when the thickness of a light-transmitting cover plate is measured by the existing electronic equipment, if the surface of the light-transmitting cover plate is shielded by other objects, clutters can be generated in the ultrasonic reflection process, and the clutters can interfere with the measurement result.

The invention relates to the technical field of planting fertilizers, in particular to a method for preparing special fertilizers for stevia rebaudiana. The method has the advantages that alkali lignin-polyvinyl alcohol cross-linking reaction films prepared from alkali lignin and polyvinyl alcohol wrap the roots of the stevia rebaudiana, the lignin can be dissolved in solution and can be dissolvedwith the polyvinyl alcohol, the distances between polyvinyl alcohol molecules can be enlarged, obstruction between gas molecules can be relatively reduced, diffusion can be facilitated, and accordingly the air permeability of films can be improved; reaction can be carried out on added cross-linking agents and hydroxyl of the lignin and hydroxyl of the polyvinyl alcohol, lignin molecules and the polyvinyl alcohol molecules can be integrated with one another, the molecules are good in interaction with one another, and the light transmittance of the films can be improved; the films are air-permeable, light can be transmitted through the films, and accordingly influence on normal respiration of the roots can be prevented; the lignin with diversified aromatic rings has the capability of shielding ultraviolet radiation, the ultrasonic absorption of the films can be improved, the ageing-resistant performance of the films can be enhanced, accordingly, diseases due to germs can be inhibited, and the yield of the stevia rebaudiana can be increased.

The invention relates to a multi-channel micro-fluidic chip device provided with a strong hydrophobic substrate and applied to syphilis diagnosis and belongs to the field of analysis and testing. To utilize cheap and easy-to-process PDMS (polydimethylsiloxane) for manufacturing the substrate of a micro-fluidic chip for syphilis diagnosis is a technical target, but the effect of targeted surface modification or surface finish is difficult to last due to strong hydrophobicity of the surface of the material. The scheme aims at solving the related problems and is characterized in that the substrate adopts PDMS with an original surface, a hinge type fixture equipped with an attached miniature ultrasonic transducer is manually fastened and located in the position adjacent to a sample liquid flow terminal of the micro-fluidic chip, interfacial tension is reduced by the aid of ultrasonic waves, meanwhile, the ultrasonic intensity is reduced progressively and rapidly in a short distance on the basis of high ultrasonic absorption capacity of PDMS, so that interfacial tension difference is formed between two ends of the chip, and the sample liquid flow is enabled to flow towards the terminal along originally hydrophobic capillary channels.

Disclosed is an ultrasonic transducer assembly comprising an ultrasonic transducer chip (100) having a main surface comprising a plurality of ultrasound transducer elements (112) and a plurality of first contacts (120) for connecting to said ultrasound transducer elements; a contact chip (400) having a further main surface comprising a plurality of second contacts (420); an backing member (300) comprising ultrasound absorbing and / or scattering bodies (310), said backing member comprising a first surface (302) on which the transducer chip is mounted and a second surface (306) on which the contact chip is mounted; and a flexible interconnect (200) extending over said backing member from the main surface to the further main surface, the flexible interconnect comprising a plurality of conductive tracks (210), each conductive track connecting one of said first contacts to a second contact. An ultrasound probe including such an assembly, an ultrasonic imaging system including such an ultrasound probes and manufacturing methods of such an assembly and probe are also disclosed.

The present invention discloses a research system for delaying transition of high-supersonic-velocity boundary layer material, comprising: an ultrasonic absorption layer model; an ultrasonic generator arranged on one side of the ultrasonic absorption layer model; and a pressure sensor arranged on the other side of the ultrasonic absorption layer model for receiving echoes. The invention also discloses an experimental research method for delaying transition of high-supersonic-velocity boundary layer material, and the method enables effective application of the research system for delaying transition of high-supersonic-velocity boundary layer material to carry out research on the impact of ultrasonic absorption layer geometry upon wave absorption characteristics of the material; the invention also provides a method for capturing acoustic resonance mode in the high-supersonic-velocity boundary layer material, and the method is used for validating existence of the acoustic resonance mode to to provide comprehensive experimental support and scientific basis for the design of ultrasonic absorption layers.