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40results about How to "Small energy attenuation" patented technology
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Underwater target DOA estimation method based on active virtual time reversal method
InactiveCN108845309ASmall energy attenuationImprove signal-to-noise ratioRadio wave reradiation/reflectionPeak valueArray element
The invention provides an underwater target DOA (Directional of Arrival) estimation method based on an active virtual time reversal method. In a uniform linear array of a hydrophone, a detection acoustic source sends a signal, and a target receives the signal and reflects the signal. Each array element of the uniform linear array receives the signal and virtual time reversal is realized in a computer after filtering. After normalization processing, the time reversal signals are virtually transmitted to a channel as secondary transmission signals in the computer. Spatial smoothing is performedon secondary receiving signals and a covariance matrix of each sub-array is obtained respectively. A spatial spectral function of a Capon algorithm based on ADVTR (Active Detection on Virtual Time Reversal) is calculated and spectral peak searching is performed, and a spectral peak value is used as a DOA estimation value of the target. The invention reduces the energy attenuation of signals, improves the signal-to-noise ratio of the receiving signals, and can be directly extended to two or more targets.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Aqueous toughened glass printing ink dedicated for touch screen and preparation method thereof
The invention belongs to the technical field of chemical printing ink, and specifically relates to an aqueous toughened glass printing ink dedicated for touch screen and a preparation method thereof. The aqueous toughened glass printing ink is prepared from the following raw materials in parts by weight: 6 to 28 parts of inorganic pigment, 20 to 50 parts of first glass powder frit, 10 to 40 parts of second glass powder frit, 10 to 60 parts of aqueous varnish, 0 to 2 parts of wetting dispersant, 0 to 1 part of antifoaming agent, and 0 to 2 parts of leveling agent. The printing ink can improve the surface acoustic wave signal transduction performance of touch screen glass, solves the problem that after surface acoustic waves go through tough screen glass, the signal attenuates, and has the advantages that the covering performance of the printing ink is good, the surface acoustic wave propagation speed is quick, the energy attenuation is little, no phase change happens, and the corrosion of the printing ink is weak.
Owner:郑州市亚美凯新材料有限公司
Infrared polarization imaging measuring device based on rotating polarizer
ActiveCN109632102AMeet frame rate requirementsAccurate measurementLight polarisation measurementLight beamPolarizer
The invention relates to an infrared polarization imaging measuring device based on a rotating polarizer. The device comprises an infrared optical lens, a multi-directional polarizing unit, an infrared focal plane detector and a control unit. The infrared optical lens adjusts the polarized light of a target scene to acquire a detecting beam. The multi-directional polarizing unit acquires polarizedbeams with different polarizing directions by changing the polarizing direction of the detecting beam. The infrared focal plane detector images the polarized beams of different polarizing directionsto acquire the infrared intensity images of the polarized beams of different polarizing directions and output the images. The control unit is used to control the multi-directional polarizing unit to sequentially change the polarizing direction, so that the infrared focal plane detector can acquire the infrared intensity images of the polarized beams of different polarizing directions, which are corresponding to the sequentially changing polarization direction, at a predetermined frame rate. The device provided by the invention can be used to measure the moving or changing target scene.
Owner:BEIJING INST OF ENVIRONMENTAL FEATURES
Multi-component and single-core-shell structured positive electrode material of lithium ion battery and preparation method
ActiveCN105895856AImprove other electrochemical propertiesImprove securityNon-aqueous electrolyte accumulator electrodesSpinelSodium-ion battery
The invention provides a multi-component and single-core-shell structured positive electrode material of a lithium ion battery. The positive electrode material comprises a shell and a core arranged in the shell, wherein the core comprises at least two kinds of components; the material of each component is selected from one kind of a positive electrode active material with a laminated structure, a positive electrode active material with a spinel structure, and a positive electrode active material with an olivine structure; the material of the shell is selected from at least two kinds of the materials selected from the positive electrode active material with the laminated structure, the positive electrode active material with the spinel structure, and the positive electrode active material with the olivine structure; the positive electrode active material with the laminated structure comprises <x>Li<2>MO<3>.(1-x)LiMO<2>, wherein x is greater than or equal to 0 and less than 1; the positive electrode active material with the spinel structure comprises LiM<2>O<4>; and the positive electrode active material with the olivine structure comprises LiMPO<4>, wherein M is selected from one or more of metal elements with the atomic number of greater than six. The invention also provides a preparation method for the positive electrode material of the lithium ion battery.
Owner:ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
Compensation method for improving color shadow in digital images
InactiveCN101815158ASmall energy attenuationSave memoryImage data processing detailsPictoral communicationDigital imageShadow compensation
Owner:ALTEK CORP
Quick enzyme inactivation method
ActiveCN104351908AOvercome the defect of easily changing the color of the materialSmall energy attenuationFruits/vegetable preservation by irradiation/electric treatmentProduct processingPhysics
The invention discloses a quick enzyme inactivation method and belongs to the technical field of agricultural product processing. The method comprises the following steps: performing far-infrared radiation and contact ultrasonic treatment on a material to be treated, wherein the distance between a far-infrared radiation source and the material to be treated is 5-10 cm, the far-infrared radiation power is 500-1,000 W, the peak wavelength is 5-15 microns, the contact ultrasonic power is 400-800 W, and the frequency is 20-100 kHz. According to the method, a power ultrasound process is combined with a far-infrared radiation process, the processes of quickly inactivating enzyme and effectively inhibiting enzymatic browning are performed by cavitation, mechanical and impact effects of ultrasonic waves and heat and spectrum effects of far-infrared radiation, 90% of polyphenol oxidase in the material is inactivated after the material is subjected to enzyme inactivation for 1-3 minutes, and the color difference of the material subjected to enzyme inactivation is only 0.58-1.12. The method is suitable for agricultural products such as honeysuckle unsuitable for conventional blanching, stewing or chemical enzyme inactivation.
Owner:HENAN UNIV OF SCI & TECH
Random polarized laser splitting device and method
ActiveCN104259657ASmall energy attenuationHigh utilization of total powerLaser beam welding apparatusPhysicsOptical path
The invention relates to a random polarized laser splitting device and method. A laser output light path is provided with a first three-dimensional PBS (Polarization Beam Splitter); a first total reflection mirror and a second total reflection mirror are arranged at a light beam transmission output end and a light beam reflection output end of the first three-dimensional PBS respectively; a light beam reflection output end of each total reflection mirror is provided with a second three-dimensional PBS; a horizontal emergent end of the second three-dimensional PBS is provided with a third half lambda slide and a third three-dimensional PBS; a horizontal emergent end of the third three-dimensional PBS is provided with a fourth half lambda slide and a fourth three-dimensional PBS; a vertical emergent end of the fourth three-dimensional PBS is provided with a power meter; a vertical emergent end of the second three-dimensional PBS, a vertical emergent end of the third three-dimensional PBS and the vertical emergent end of the fourth three-dimensional PBS are provided with a quarter lambda slide and a focusing mirror respectively. Accordingly, the control accuracy of the beam splitting energy can be significantly improved and the expansion of the number of the beam splitting is facilitated.
Owner:SUZHOU DELPHI LASER +1
High-energy acoustic beam regulation and control device for residual stress of annular workpiece
The invention discloses a high-energy acoustic beam regulation and control device for residual stress of an annular workpiece. The high-energy acoustic beam regulation and control device comprises excitation wedge blocks, high-energy acoustic beam exciters, exciter mounting plates, fixing bolts, a triangular support frame, puller bolts, mounting bolts and a base, wherein the triangular support frame is fixed on the base through the mounting bolts, the upper part and the lower part of the triangular support frame are each provided with three threaded holes, 18 high-energy acoustic beam exciter mounting holes are evenly arranged in the circumferential direction, the puller bolts penetrate through the threaded holes to abut against the exciter mounting plates, the exciter mounting plates are each an arc-shaped plate, the 6 exciter mounting plates are arranged in the circumferential direction, the excitation wedge blocks are installed on the exciter mounting plates through the fixing bolts, the exciters are connected together through tail threads of the excitation wedge blocks, the front end of the excitation wedge block is an arc-shaped surface, and lubricating grease is smeared between the arc-shaped surface of the excitation wedge block and an annular workpiece. All the exciters and the annular workpiece can be integrally and tightly attached, energy attenuation is reduced, the conduction efficiency is improved, and efficient integral regulation and control of the residual stress of the annular workpiece are achieved.
Owner:NANJING CHENGUANG GRP
Semiconductor film field effect transistor made of unstable two-dimensional material and preparation method thereof
ActiveCN110634958ASmall electrical hysteresisIncrease productionTransistorSemiconductor/solid-state device manufacturingMicro nanoHysteresis phenomenon
The invention relates to a semiconductor film field effect transistor made of an unstable two-dimensional material and a preparation method thereof. The field effect transistor sequentially comprisesa silicon wafer substrate, the unstable two-dimensional material, an aluminum oxide film, a source electrode and a drain electrode from bottom to top. According to the method, the unstable two-dimensional material in the air and the solvent can be obtained through a simple method, and a small-size electronic device can be obtained through the micro-nano machining technology, moreover, the field effect mobility can reach the level of the hard mask process, and the yield is higher. For an InSe film, the highest field effect mobility exceeds 550 cm<2> / Vs. A device channel is protected by a packaging buffer layer at the same time, and the performance is not reduced in the air environment as long as 60 days. The aluminum oxide packaging buffer layer is stable and transparent, and can be appliedto further manufacturing of photoelectric micro-nano devices, and the electric hysteresis phenomenon is small (less than 1V).
Owner:SHANDONG UNIV
Deep venous embolism prevention and treatment apparatus
InactiveCN105797280AShorten the timeGood treatment effectElectrotherapyLight therapyMedical equipmentMedicine
The invention discloses a deep venous embolism prevention and treatment apparatus and belongs to the medical equipment field. The apparatus includes a control device and a treatment device; the control device and the treatment device are connected through a connecting component; the treatment device wraps an affected area; the treatment device comprises a fixing area and a treatment area; one or a plurality of air chambers are arranged between the outer layer and inner layer of the treatment area; a plurality of optical light-emitting heads are embedded in each air chamber; conductive rubber is pressed on one side of the treatment area which faces the affected area; one side of the inner layer of the treatment area, which faces the affected area, is provided with windows matched with the optical light-emitting heads; and the inner layer of the treatment area includes a full-transparent silica gel layer. With the deep venous embolism prevention and treatment apparatus of the invention adopted, three kinds of deep vein embolism prevention and treatment methods can be adopted to perform simultaneous treatment, and therefore, time can be saved for doctors and patients, and treatment effects are better.
Owner:BEIJING CHAOYANG HOSPITAL CAPITAL MEDICAL UNIV +1
3D type PIN structure alpha irradiation battery and manufacturing method thereof
ActiveCN104051043AReduce lossIncrease collection rateRadiation electrical energyElectrical batteryOhmic contact
The invention discloses a 3D type PIN structure alpha irradiation battery and a manufacturing method of the 3D type PIN structure alpha irradiation battery. The 3D type PIN structure alpha irradiation battery and the manufacturing method mainly solve the problems that an existing alpha irradiation battery is low in energy conversion rate and output power. The manufacturing method includes the implementation steps of sequentially growing an N type lightly-doped 4H-SiC epitaxial layer and a P type highly-doped 4H-SiC epitaxial layer on a washed 4H-SiC substrate in an epitaxial mode, forming ohmic contact electrodes on the non-epitaxial back face of the P type highly-doped epitaxial layer and the non-epitaxial back face of the SiC substrate through deposition, conducting photoetching on the P type ohmic contact electrodes to obtain groove windows, conducting etching to obtain grooves, and placing alpha irradiation sources in the grooves to obtain the 3D type PIN structure alpha irradiation battery. The 3D type PIN structure alpha irradiation battery manufactured according to the method has the advantages that the contact area between the alpha irradiation battery and the alpha irradiation sources is large, the nuclear raw material utilization rate and the energy collection rate are high, and the battery output current and the battery output voltage are large; the 3D type PIN structure alpha irradiation battery can unceasingly supply power for miniature circuits or can supply power on the occasions where long-time power supply is needed but not unmanned.
Owner:XIDIAN UNIV
Parallel type PIN type beta irradiation battery and preparing method thereof
ActiveCN104051042AReduce energy lossIncrease output currentRadiation electrical energyElectrical batteryEngineering
The invention discloses a parallel type PIN type beta irradiation battery and a preparing method thereof to mainly solve the problems that a current nuclear battery is low in energy converting ratio and output power. The parallel type PIN type beta irradiation battery comprises an upper PIN junction, a lower PIN junction and beta irradiation sources, wherein the upper PIN junction and the lower PIN junction are connected in parallel. The lower PIN junction comprises an N type ohmic contact electrode, an N type highly-doped 4H-SiC substrate, an N type lightly-doped epitaxial layer, a P type highly-doped epitaxial layer and a P type ohmic contact electrode from bottom to top in sequence, the top-to-bottom structural distribution of the PIN junction is the same as the bottom-to-top structural distribution of the lower PIN junction, a plurality of grooves are formed in each PIN junction, and the beta irradiation sources are placed in the grooves respectively. The two PIN junctions make contact with each other through the P type ohmic contact electrode, and the upper groove and the lower groove are in mirror symmetry and are communicated with each other. The parallel type PIN type beta irradiation battery has the advantages that the contact area between the irradiation sources and a semiconductor is large, the nuclear raw material utilization rate and the energy collection rate are high, and the output voltage of the battery is large, and the battery can provide power for a miniature circuit continuously or can provide power for polar regions, deserts and other areas.
Owner:XIDIAN UNIV
Arc striking device of electric welding machine and arc striking method thereof
ActiveCN111906409APrevent oxidationImprove welding effectArc welding apparatusShielding gasElectric machinery
The invention belongs to the technical field of electric welding machines, and particularly relates to an arc striking device of an electric welding machine and an arc striking method thereof. The arcstriking method comprises the following steps that S1, workpieces to be welded are placed on a base I, and the workpieces are pressed through a fixing plate; the distance between the two workpieces is adjusted through an air cylinder III; and test blocks made of the same material are placed in a test clamping groove; S2, on the basis of S1, a power supply is switched on, an arc striking box is started, a tungsten electrode is controlled to be close to the test blocks, and the arc striking effect is tested; S3, after S2 is completed, the test blocks are taken down, and the distance between thetungsten electrode and the workpieces is adjusted; S4, on the basis of S3, the angle of the welding position of the tungsten electrode and the workpieces is adjusted; and S5, whether a welding wire is used or not is selected according to the material of the welding workpieces, and when the welding wire is used, the welding wire is sent to a welding position, a motor is controlled to operate, a protection plate is enabled to be close to the tungsten electrode, and protective gas is introduced and released. The arc striking device is good in arc striking effect, stable in work, reliable in performance and safe to use.
Owner:ZHEJIANG LAOSHIDUN WELDING EQUIP
GIS shell defect detection method based on magnetostriction torsional guided waves
PendingCN111537617AStrong guided wave energySmall energy attenuationAnalysing solids using sonic/ultrasonic/infrasonic wavesMaterial magnetic variablesEngineeringStructural engineering
The invention discloses a GIS shell defect detection method based on magnetostriction torsional guided waves. The method comprises the steps: selecting a position of a GIS shell, and installing an excitation band at the position; fixing a detection type sensor to the excitation band, and carrying out defect overall screening on the GIS shell through the detection type sensor; and accurately positioning the defects of the GIS shell along the surface of the excitation band by using a scanning sensor. In the embodiment of the invention, the problems of complicated instrument operation steps, lowdetection sensitivity and difficulty in accurately positioning the defects are solved, and the electrified detection of the defects of the GIS shell is realized.
Owner:GUANGXI POWER GRID ELECTRIC POWER RES INST
Exciter and printed circuit board communication system
InactiveCN111384590ASmall energy attenuationImprove transmission efficiencyAntenna arraysRadiating elements structural formsSignal waveCommunications system
The invention provides an exciter and a printed circuit board communication system, and relates to the technical field of communication. The exciter comprises a PCB antenna (101) and a mode conversionstructure (102). The PCB antenna (101) is configured to emit transverse electromagnetic field TEM waves; the mode conversion structure (102) is located on the side where the beam transmitting end ofthe PCB antenna (101) is located; the mode conversion structure (102) is configured to receive the TEM waves, convert the TEM waves into surface waves and then output the surface waves. According to the invention, the problems of low data transmission efficiency and large signal loss of signal waves at the bent part of the transmission line can be solved.
Owner:BEIJING HUAWEI DIGITAL TECH
A portable ultrasonic cleaning device
ActiveCN108729095BSmall energy attenuationSmall footprintTextiles and paperVibration washing machinesLaundryMechanical engineering
The invention belongs to the field of washing, and in particular relates to a portable ultrasonic washing device, comprising a washing tank for soaking clothes to be washed and an ultrasonic generating device arranged above the washing tank, and the interval between the washing tank and the ultrasonic generating device is At a certain distance, when washing, the laundry is located between the washing tank and the ultrasonic generating device, the upper part of the laundry is in contact with the ultrasonic generating device, and the lower part is in contact with the liquid in the washing tank. After washing, the ultrasonic generating device Stored in the washing tank, after washing, the ultrasonic generating device is stored in the washing tank, so that the ultrasonic cleaning device takes up less space and is more portable; when washing, by contacting the ultrasonic generating device with the clothes to be washed, the cleaning effect is greatly reduced. The energy attenuation of ultrasonic waves in water is improved, and the decontamination effect is improved. This structure has an outstanding effect on removing stubborn stains on clothes.
Owner:QINGDAO HAIER WASHING MASCH CO LTD +1
Bulk silicon mems waveguide combining method for spatial wave mixing in terahertz band
ActiveCN109818683BShorten the pathSimple compositionSpatial transmit diversityAntenna supports/mountingsLocal oscillator signalFrequency mixer
The invention relates to a bulk silicon MEMS waveguide combining method for space wave mixing in terahertz frequency band, and belongs to the technical field of terahertz wave mixing receiving front-end. The method introduces bulk silicon MEMS technology to manufacture a terahertz local oscillator signal receiving antenna, a terahertz signal receiving antenna to be measured and a waveguide duplexer. The waveguide duplexer superimposes the received terahertz local oscillator signal and the electrical signal of the signal to be measured, and outputs the waveguide input to the terahertz mixer through the waveguide duplexer, and at the same time isolates the terahertz local oscillator signal receiving antenna from the terahertz receiver. Test signal receiving antenna. This method replaces the optical splitter film combining method with obvious loss in the common terahertz space wave mixing system under the situation that both the terahertz local oscillator signal and the signal to be measured are in the form of space radiation waves; it realizes the integration and integration of system design. to improve the receiving sensitivity of the system.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Device and method for splitting randomly polarized laser light
ActiveCN104259657BHighlight substantive featuresSignificant progressLaser beam welding apparatusBeam splittingLight beam
The invention relates to a random polarized laser splitting device and method. A laser output light path is provided with a first three-dimensional PBS (Polarization Beam Splitter); a first total reflection mirror and a second total reflection mirror are arranged at a light beam transmission output end and a light beam reflection output end of the first three-dimensional PBS respectively; a light beam reflection output end of each total reflection mirror is provided with a second three-dimensional PBS; a horizontal emergent end of the second three-dimensional PBS is provided with a third half lambda slide and a third three-dimensional PBS; a horizontal emergent end of the third three-dimensional PBS is provided with a fourth half lambda slide and a fourth three-dimensional PBS; a vertical emergent end of the fourth three-dimensional PBS is provided with a power meter; a vertical emergent end of the second three-dimensional PBS, a vertical emergent end of the third three-dimensional PBS and the vertical emergent end of the fourth three-dimensional PBS are provided with a quarter lambda slide and a focusing mirror respectively. Accordingly, the control accuracy of the beam splitting energy can be significantly improved and the expansion of the number of the beam splitting is facilitated.
Owner:SUZHOU DELPHI LASER +1
Epitaxy GaN parallel type PIN type alpha irradiation battery and manufacturing method thereof
InactiveCN104051048AReduce energy lossIncrease output currentRadiation electrical energyElectrical batteryEngineering
The invention discloses an epitaxy GaN parallel type PIN type alpha irradiation battery and a manufacturing method of the epitaxy GaN parallel type PIN type alpha irradiation battery. The epitaxy GaN parallel type PIN type alpha irradiation battery mainly solves the problem that the current nuclear battery energy conversion rate and output power are low and comprises an upper PIN node, a lower PIN node and alpha irradiation sources, the upper PIN node and the lower PIN node are in parallel connection, the lower PIN node sequentially comprises an N-type ohmic contact electrode, an N-type highly-doped 4H-SiC substrate, an N-type lowly-doped SiC epitaxial layer, a P-type highly-doped GaN epitaxial layer and a P-type ohmic contact electrode from bottom to top, and the bottom-to-top structural distribution of the upper PIN node is the same as that of the lower PIN node. A plurality of grooves are formed in each PIN node, the alpha irradiation sources are arranged in the grooves respectively, the two PIN nodes are in contact through the P-type ohmic contact electrode, and the upper grooves and the lower grooves are in mirror symmetry and are communicated. The epitaxy GaN parallel type PIN type alpha irradiation battery has the advantages that the contact area between the irradiation sources and a semiconductor is large, the utilization and the energy collecting rate of the nuclear raw materials are high, and the output voltage of the battery is high, and a microcircuit can be constantly powered up.
Owner:XIDIAN UNIV
Epitaxy GaN PIN structure beta irradiation battery and preparation method thereof
InactiveCN104064240AReduce lossIncrease collection rateRadiation electrical energyElectrical batteryEngineering
The invention discloses an epitaxy GaN PIN structure beta irradiation battery and a preparation method thereof. At present, a beta irradiation battery has problems of low energy transformation ratio and low output power, and the invention is mainly used to solve the problems. The implementation of the epitaxy GaN PIN structure beta irradiation battery comprises the following steps: an N-type lightly-doped SiC epitaxial layer and a P-type highly-doped GaN epitaxial layer are grown on a cleaned 4H-SiC substrate successively in the epitaxial growth manner; a P-type Ti / Au ohmic contact electrode is then deposited onto the P-type highly-doped GaN epitaxial layer, and an Ni contact electrode is deposited onto the back surface of the SiC substrate which does not undergo the epitaxy growth; and then, a trench window is formed in the P-type Ti / Au electrode through lithography, and trenches are etched; and finally, a beta radiation source is placed into each trench to obtain the epitaxy GaN PIN structure beta irradiation battery. According to the invention, the fabricated battery has advantages of large radiation source and semiconductor contact area, high nuclear raw material utilization rate and energy collection rate, and large battery output current and voltage, and the battery can be used to supply power to a small circuit in a lasting manner or supply power in unattended occasions which need to be powered for a long time.
Owner:XIDIAN UNIV
Sound wave warning method, system and device and storage medium
PendingCN114639210ASmall energy attenuationReduce the impact of noiseElectric/electromagnetic audible signallingNoiseEngineering
The invention relates to a sound wave warning method, system and device and a storage medium, the method is used for a sound wave warning device, the sound wave warning device comprises a loudspeaker capable of adjusting the size of a cone opening, and the method comprises the following steps: determining the distance between a target event and the sound wave warning device; determining the size of the opening of the cone based on the distance, and giving an alarm based on the sound wave warning device; wherein the size of the opening of the cone corresponds to the distance, so that sound waves can be transmitted in a small range in a concentrated manner, energy attenuation of the sound waves is reduced, noise influence on a non-target area is reduced, and the problems that in the prior art, sound wave alarm is spread all around, sound wave energy is rapidly attenuated, and noise influence is large are solved.
Owner:杭州华橙软件技术有限公司
Double-arc Chinese zither
InactiveCN101499263ASmall energy attenuationExtended decay timeStringed musical instrumentsEngineeringResonance
The invention discloses a double-arc Chinese zither in the field of plucked instruments. The double-arc Chinese zither includes a hollow resonance body consisting of a face plate of upper part, a base plate of lower part, end plates at two ends and front and back side plates. Three ways of bass bars are vertically arranged in the resonance body with a certain spaced distance; a sound hole is arranged in the base plate; the face plate presents upward and raised arc transition from the front side plate to the back side plate and is provided with a Chinese zither horse, a plurality of strings are erected on the Chinese zither horse and fixed with the resonance body at two ends; the diameter of strings gradually thins from the front side plate to the back side plate; and the base plate also presents upward and raised arc transition from the front side plate to the back side plate. In fabrication, the base plate is formed by bending a flat plate, after the Chinese zither is made, the upper surface of the base plate is in a stretching and tension state, has stronger elasticity and can cause sound wave to be better reflected and resounded in the resonance body; acoustic energy attenuates slightly for long time; as the base plate can better coordinate with the face plate for resonance, the timbre of the Chinese zither becomes clearer and more far-reaching, mellower and more lingering. According to the technical proposal, a high-grade Chinese zither can be made.
Owner:田步高
Infrared polarization imaging measurement device based on rotating polarizer
ActiveCN109632102BMeet frame rate requirementsAccurate measurementLight polarisation measurementLight beamControl cell
The invention relates to an infrared polarization imaging measuring device based on a rotating polarizer. The device comprises an infrared optical lens, a multi-directional polarizing unit, an infrared focal plane detector and a control unit. The infrared optical lens adjusts the polarized light of a target scene to acquire a detecting beam. The multi-directional polarizing unit acquires polarizedbeams with different polarizing directions by changing the polarizing direction of the detecting beam. The infrared focal plane detector images the polarized beams of different polarizing directionsto acquire the infrared intensity images of the polarized beams of different polarizing directions and output the images. The control unit is used to control the multi-directional polarizing unit to sequentially change the polarizing direction, so that the infrared focal plane detector can acquire the infrared intensity images of the polarized beams of different polarizing directions, which are corresponding to the sequentially changing polarization direction, at a predetermined frame rate. The device provided by the invention can be used to measure the moving or changing target scene.
Owner:BEIJING INST OF ENVIRONMENTAL FEATURES
Half-duplex communication device based on lamb wave and communication method thereof
ActiveCN107204839AReduce wiring costsReduce maintenance costsDuplex signal operationSignal processing circuitsEngineering
The invention discloses a half-duplex communication device based on a lamb wave and a communication method thereof. The half-duplex communication device based on the lamb wave comprises the components of a sensor master control module, a first signal processing circuit, a first transducer, a metal sheet member, a second transducer, a second signal processing circuit and a controller. According to the half-duplex communication device, the lamb wave in the metal sheet member is used as a signal carrier; the metal sheet member is used as a transmission medium; half-duplex communication is performed in a wireless manner; and a communication function is supplied for a data result of a sensor for structure health monitoring on the metal sheet member. The half-duplex communication device and the communication method thereof have advantages of reducing data transmission wiring and maintenance cost in a traditional sensor system, changing a traditional electromagnetic signal transmission method, realizing high suitability for multiple occasions, and improving stability of the whole system. Furthermore the half-duplex communication device and the communication method have advantages of small size, low cost, low energy attenuation, high transmission efficiency and long transmission distance.
Owner:TIANJIN UNIV
A special water-based tempered glass ink for touch screen and preparation method thereof
The invention belongs to the technical field of chemical printing ink, and specifically relates to an aqueous toughened glass printing ink dedicated for touch screen and a preparation method thereof. The aqueous toughened glass printing ink is prepared from the following raw materials in parts by weight: 6 to 28 parts of inorganic pigment, 20 to 50 parts of first glass powder frit, 10 to 40 parts of second glass powder frit, 10 to 60 parts of aqueous varnish, 0 to 2 parts of wetting dispersant, 0 to 1 part of antifoaming agent, and 0 to 2 parts of leveling agent. The printing ink can improve the surface acoustic wave signal transduction performance of touch screen glass, solves the problem that after surface acoustic waves go through tough screen glass, the signal attenuates, and has the advantages that the covering performance of the printing ink is good, the surface acoustic wave propagation speed is quick, the energy attenuation is little, no phase change happens, and the corrosion of the printing ink is weak.
Owner:郑州市亚美凯新材料有限公司
Energy mediation liquid used for extracorporeal shock wave lithotripsy, and preparation method of energy mediation liquid
PendingCN112741671ASimple processSpecific degree of ionizationSurgeryShock waveExtracorporeal shock wave lithotripsy
The invention relates to an energy mediation liquid, in particular to an energy mediation liquid used for extracorporeal shock wave lithotripsy, and a preparation method of the energy mediation liquid, and belongs to the field of medical apparatus and instruments. The energy mediation liquid used for the extracorporeal shock wave lithotripsy consists of the following ingredients in parts by weight: 1-15% of organic solvent, 0.05-1% of electrolyte, 0.05-1% of defoamer, 0.1-0.5% of metal ion chelating agent, 0.5-1% of viscosity modifier and deionized water. The invention aims to overcome the deficiencies of a treatment technology when a urinary system stone receives the extracorporeal shock wave lithotripsy at present, the shock wave energy mediation liquid which has stable properties, is safe and reliable and is conveniently manufactured is provided, and the problems that the energy of a shock wave is likely to be lost during common water quality conduction, a focusing capability is lowered after ageing and certain side effects occur during or after treatment can be solved.
Owner:王强
3D type pin structure α irradiation battery and preparation method thereof
ActiveCN104051043BReduce lossIncrease collection rateRadiation electrical energyElectrical batteryEngineering
Owner:XIDIAN UNIV
Semiconductor thin film field effect transistor of a kind of unstable two-dimensional material and preparation method thereof
ActiveCN110634958BSmall electrical hysteresisIncrease productionTransistorSemiconductor/solid-state device manufacturingField effectNano machining
The invention relates to a semiconductor film field effect transistor made of an unstable two-dimensional material and a preparation method thereof. The field effect transistor sequentially comprisesa silicon wafer substrate, the unstable two-dimensional material, an aluminum oxide film, a source electrode and a drain electrode from bottom to top. According to the method, the unstable two-dimensional material in the air and the solvent can be obtained through a simple method, and a small-size electronic device can be obtained through the micro-nano machining technology, moreover, the field effect mobility can reach the level of the hard mask process, and the yield is higher. For an InSe film, the highest field effect mobility exceeds 550 cm<2> / Vs. A device channel is protected by a packaging buffer layer at the same time, and the performance is not reduced in the air environment as long as 60 days. The aluminum oxide packaging buffer layer is stable and transparent, and can be appliedto further manufacturing of photoelectric micro-nano devices, and the electric hysteresis phenomenon is small (less than 1V).
Owner:SHANDONG UNIV
A detection method for deep metal deposits in mining areas
ActiveCN110045414BLow costSave human effortSeismic signal receiversSeismic signal recordingMining engineeringData transmission
The invention belongs to the technical field of underground metal ore detection, and in particular relates to a detection method for deep metal ore in a mining area. According to the source position of the mining blasting in the mining area, a blasting signal receiving system is arranged on the surface to receive and store the earthquake generated by the mining blasting within a certain period of time. After the signal and noise are received, the data will be transmitted to the computer for analysis and processing, and the distribution of the deep metal deposits in the mining area will be analyzed accordingly. Using mining blasting signals to detect deep metal mines, that is, using underground mining blasting in mining areas as the seismic source, without artificially generating seismic sources, greatly reduces costs, and is convenient for field operations. The seismic array has the advantages of active source and passive source exploration at the same time.
Owner:JILIN UNIV
A constant temperature multi-oscillation water bath shaker
ActiveCN111632636BIncrease the number ofReduce usageBioreactor/fermenter combinationsShaking/oscillating/vibrating mixersWater bathsEngineering
The invention relates to the technical field of water-bath shakers, and discloses a constant-temperature multi-oscillation water-bath shaker, which includes a fixed box, a culture medium, and a heating device. The heating device is fixedly installed inside the fixed box. The bottom on the left side of the cavity is movably equipped with a lower transmission structure. Through the setting of the oscillating device and the fixed plate, the medium can be placed on the upper surface of the oscillating device, so that the oscillating device can be displaced relative to the fixed plate according to the shape and size of the medium, and slide down, and then the medium is embedded in the oscillating device It can be fixed and clamped, reducing the use of fixtures, and can clamp culture media of various specifications, reduce the cost of custom fixtures, and reduce test costs. At the same time, because the oscillation devices are arranged in an array, multiple The culture medium is clamped to increase the number of culture medium that needs to be shaken at one time, increase the yield, and improve the culture efficiency.
Owner:宁波赛珀生物技术有限公司
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