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80results about How to "Good linear response" patented technology

Magnetic circuit having dual magnets, speaker and vibration generating apparatus using the same

A magnetic circuit having a dual magnet, a speaker and a vibration generating apparatus using the same are provided. The magnetic circuit includes a magnetic gap having a small magnetic loss and an increasing magnetic flux density, in which a uniform distribution of a line of magnetic force can be realized on yoke surfaces facing each other. The speaker includes lower and upper magnets which are spaced so that mutually identical polarities oppose each other; a first yoke integrally having a loop-type circulating circuit portion extended from the lower magnet to the upper magnet and an extension portion which is extended perpendicularly upwards from the lower magnet; a second yoke which connects between the lower and upper magnets and forms a magnetic gap between the second yoke and the extension portion of the first yoke; a coil disposed in the magnetic gap and wound around a bobbin; a frame which is extended from the first yoke; a vibrating diaphragm generating an acoustic sound in correspondence to a drive signal; a damper limiting a vibration range of the bobbin; and a center cap covering the bobbin.
Owner:KIM SEONG BAE

Vibratory apparatus of exercise

A vibratory exercise apparatus capable of providing a sufficient vertical movement force is provided, which adopts a structure that a bobbin coil connected with a vibration plate is employed in a magnetic gap of a magnetic circuit using a permanent magnet which can generate a strong magnetic force. The vibratory exercise apparatus includes a magnetic gap type vertical vibrator which generates vertical vibration by a permanent magnet and a bobbin coil, a bobbin guide which is installed at the center of a yoke, a bobbin guide rod which is reciprocally movably coupled with the bobbin guide and whose one end is coupled with the upper portion of a bobbin, a joint whose one end is coupled with the upper portion of the bobbin, a vibration plate which is coupled with the other end of the joint, a guide which guides vertical movement of the vibration plate, and a spring which limits a range of movement of the vibration plate and absorbs impact when the vibration plate descends.
Owner:KIM SEONG BAE

Portable copper ion concentration detection method based on click chemistry

The invention provides a portable copper ion concentration detection method based on click chemistry and belongs to the field of analytical chemistry. Under the condition that sodium ascorbate reduces cupric into cuprous as a catalyst, a 1,3-dipole cycloaddition reaction is carried out between NDA modified with an azide group and DNA modified with an alkynyl group, so that DNA modified with cane sugar invertase is fixed on magnetic beads; The magnetic beads are separated from a solution, the cleaned magnetic beads are dissolved into a cane sugar solution to carry out enzymatic hydrolysis, and then a reaction solution after enzymatic hydrolysis is measured by adopting a blood glucose meter, so that copper ion concentration can be detected. The portable copper ion concentration detection method provided by the invention takes the blood glucose meter as a platform and can portably and quickly detect the copper ion concentration on site; and the portable copper ion concentration detection method can be applied to copper ion detection in a human body serum sample, and the portable copper ion concentration detection method has the advantages of easy operation, low cost, high sensitivity and good specificity.
Owner:FUZHOU UNIV

Fluorescence detection method for copper ion based on click chemistry

The invention provides a fluorescence detection method for copper ions based on click chemistry and belongs to the technical field of chemical analysis and detection. A short single chain nucleic acid which is modified by an azide group, a short single chain nucleic acid which is modified by an alkynyl group and a nucleic acid which is used as a linking template are respectively dissolved in a Tris-HCl buffer solution to prepare a nucleic acid solution and form a mixed solution. Ascorbic acid, water and a Tris-HCl buffer solution are added in the mixed solution to form a detection system. A to-be-detected sample is added to the detection system. A fluorescence detection process is carried out to the fluorescence intensity of the detection system. Copper ion concentration of the corresponding to-be-detected sample is calculated with a known copper ion concentration being an abscissa and a corresponding fluorescence intensity value being an ordinate. The fluorescence detection method employs a linking reaction of nucleic acids based on the click chemistry, is simple and quick, is good in stability and high in sensitivity, and has a good linear response in a range from 0 to 40 nM and a detection limit as low as 0.023 nM.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI

Circulating tumor cell detection method based on surface-enhanced Raman spectroscopic probe

The invention relates to the technical field of spectra, in particular to a circulating tumor cell detection method based on a surface-enhanced Raman spectroscopic probe. The method includes the steps: building the surface-enhanced Raman spectroscopic probe taking luteinizing hormone-releasing hormone as a targeting molecule; using the surface-enhanced Raman spectroscopic probe for circulating tumor cell detection. The surface-enhanced Raman spectroscopic probe is rapider, more convenient and lower in cost when being used for circulating tumor cell detection, has enough specificity and flexibility for circulating tumor cell detection and can provide a feasible strategy for clinical practice.
Owner:SECOND MILITARY MEDICAL UNIV OF THE PEOPLES LIBERATION ARMY

Intelligent vehicle automatic vehicle motion control system and control method thereof

The invention relates to an intelligent vehicle automatic vehicle motion control system and a control method thereof. The intelligent vehicle automatic vehicle motion control system and the control method thereof solve the problem of the lack of safe and reliable intelligent vehicles in the prior art. The key points of the technical scheme of the intelligent vehicle automatic vehicle motion control system and the control method thereof are that navigation trajectories comprise a main navigation trajectory, auxiliary navigation trajectories which are arranged on both sides of the main navigation trajectory respectively and parallel to the main navigation trajectory, and a magnetic navigation trajectory embedded under the main navigation trajectory; a navigation identification modules comprise a main video identification navigation module corresponding to the main navigation trajectory, a magnetic induction module, and an auxiliary video navigation identification module corresponding to the auxiliary navigation trajectories; a wireless communication module, the main video identification navigation module, the magnetic induction module and the auxiliary video identification navigation module are connected with a master controller; a communication device is communicated with the wireless communication module. The intelligent vehicle automatic vehicle motion control system and the control method thereof are safe, reliable and high in stability.
Owner:ZHEJIANG GEELY HLDG GRP CO LTD +1

Electrode-modified microfluidic detection chip for heavy metal ions and preparation method of detection chip

An embodiment of the invention provides an electrode-modified microfluidic detection chip for heavy metal ions. The detection chip includes a microfluidic module and a three-electrode sensor, whereinthe microfluidic module is integrally formed by 3D printing, and the interior of the microfluidic module has a microchannel and a sensor insertion groove; the three-electrode sensor includes three electrodes printed on a card-shaped base plate, wherein a working electrode is a bare carbon electrode modified by porous nano-NiMn2O4; and the three-electrode sensor is inserted into the sensor insertion groove matched with the three-electrode sensor to form the microfluidic detection chip. The bare carbon working electrode modified by the NiMn2O4 porous nanomaterial has little increase in impedanceand maintains good reversibility, the detection chip using the working electrode has better linear response to lead and cadmium, so that the detection sensitivity to trace lead and cadmium is significantly improved, the detection limit is as low as half of that of a chip using an original bare carbon working electrode, and the detection performance of the microfluidic detection chip is enhanced.The embodiment of the invention also provides a preparation method of the microfluidic detection chip.
Owner:JIANGSU YANGTZE TESTING & CERTIFICATION CO LTD +1

Magneto-resistive head having a stable response property without longitudinal biasing and method for manufacturing the same

Embodiments in accordance with the present invention provide a method of manufacturing a magneto-resistive head which can realize high sensitivity and good linear response characteristics with low noise even if a track width becomes narrower. A uniaxial anisotropy unaffected by annealing which is due to the orientation of the crystal grain growth direction, is induced in a magnetic layer. The free magnetic layer has the synthetic antiferromagnetic construction: first magnetic layer / interlayer antiferromagnetic coupling layer / second magnetic layer, the magnitude of the antiferromagnetic coupling is adjusted, and linear response characteristics are obtained even if a longitudinal biasing field applying mechanism is not provided.
Owner:WESTERN DIGITAL TECH INC

Direct digital sampling method for radios

InactiveUS20080261638A1Reduce impactEasy and less-expensive to implementRadio transmissionAnalogue-digital convertersMarker beaconUp conversion
A direct digital sampling and synthesis general purpose radio system is disclosed which employs single or multiple receiver and / or transmitter sub-systems that require no analog frequency conversion or translation circuitry. Receiver signal processing is disclosed that describes methods of conditioning and digitizing an entire received RF signal band in which the down conversion, channelization and demodulation are performed digitally. In addition, a method for direct synthesis of transmitter signals is also disclosed where up conversion and carrier modulation is performed digitally. Several mitigation techniques are described which aid in overcoming device limitations as well as overcoming problems created by combining multiple digital transmitters and receivers into a single integrated system. One embodiment of the invention describes an integrated VHF / UHF aircraft NAV / COMM radio system which combines a VHF transmitter with four VHF / UHF receivers all of which require no IF circuitry. This embodiment allows for multiple simultaneous airborne radio services on a single platform such as voice and data communication modes (AM, ACARS, VDLM2, LAAS, etc.) as well as navigational modes such as VOR, ILS, and Marker Beacon. By utilizing direct digital methods, the signal processing burden is moved almost entirely to the digital domain where the processing can be optimized for each signal type and where linearity is guaranteed. Fewer RF components are required which result in less unit to unit variability, lower production costs, and improved reliability.
Owner:AVIDYNE CORPORATION

Co3O4 nanocrystal, preparation method thereof, use thereof and non-enzymatic hydrogen peroxide sensor thereof

InactiveCN102583582AAchieve synthesisAchieving synchronous assemblyNanotechnologyCobalt oxides/hydroxidesQuinolineNanocrystal
The invention which discloses a Co3O4 nanocrystal, a preparation method thereof, a use thereof and a non-enzymatic hydrogen peroxide sensor thereof relates to a nanostructure. The Co3O4 nanocrystal has a flower spray-shaped crystal morphology. The preparation method comprises the following steps: mixing an aqueous Co<2+> solution with 8-hydroxyquinoline and urea, reacting under a hydrothermal condition to obtain a solid deposit which is a Co and 8-hydroxyquinoline complex, and roasting the complex as a precursor at a high temperature to obtain the Co3O4 nanocrystal. An inert electrode is modified by the Co3O4 nanocrystal to prepare the hydrogen peroxide sensor which is used for measuring the concentration of hydrogen peroxide in a solution. The method provided in the invention, which is simple and mild and treats the complex as the predecessor, allows the flower spray-shaped Co3O4 nanocrystal with the advantages of high yield and high quality to be obtained.
Owner:NANJING UNIV

Knittable fiber-based transistor glucose sensor and preparation method of knittable fiber-based transistor glucose sensor

ActiveCN106770589AGood flexibilityReal-time monitoring of glucose concentrationMaterial analysis by electric/magnetic meansFiberConductive polymer composite
The invention relates to the field of sensors and in particular relates to a knittable fiber-based transistor glucose sensor and a preparation method of the knittable fiber-based transistor glucose sensor. The fiber-based transistor glucose sensor comprises an organic electrochemical transistor; the organic electrochemical transistor comprises a source-drain electrode and a grid electrode which is crossed with the source-drain electrode; gel electrolyte, which is used for stopping direct contact between the source-drain electrode and the grid electrode, is arranged at the crossed point of the source-drain electrode and the grid electrode; the source-drain electrode is a conductive high molecular composite material formed by polymerizing a flexible matrix material and a conductor monomer; the grid electrode is obtained by attaching glucose oxidase on the surface of the source-drain electrode through a fixing agent. The glucose sensor provided by the invention has relatively good flexibility, excellent sensing performance and relatively good anti-interference performance.
Owner:WUHAN TEXTILE UNIV

Preparation method and application of modification electrode

The invention discloses a preparation method and application of a modification electrode. According to the preparation method, a polysulfanilic acid modified graphite electrode is prepared, the electrochemical behavior of o, m and p-nitrophenol on the electrode is studied through a cyclic voltammetry method, and a cyclic voltammetry curve is subjected to semi-differential treatment, so that the sensitivity and the separation degree of the electrode are further improved. The result shows that in a phosphate buffer solution of which the pH value is 8.00, the modified electrode has a remarkable function in distinguishing electrochemical oxidation of three isomers and a function of remarkably improving the current sensitivity. Compared with a naked graphite electrode, according to the graphite electrode, the differences of two adjacent oxidation peak potentials between o-nitrophenol and p-nitrophenol and between p-nitrophenol and m-nitrophenol are respectively increased to be 90mV and 155mV from 80mV and 133mV, and meanwhile the measurement sensitivity is remarkably improved, the peak current and the concentration of components are in relatively good linear response, and the electrode is good in reproducibility and stability.
Owner:XUCHANG UNIV

Pressure sensor and preparation method thereof

The disclosure provides a flexible pressure sensor in a first aspect and provides a preparation method of the flexible pressure sensor in a second aspect. According to the technical scheme, the flexible pressure sensor with a simple structure is prepared by sequentially printing an electrode array on a flexible substrate and coating a pressure-sensitive material in a scraping manner, the use of expensive equipment and complex processes is avoided, and the pressure sensor has the technical effects that the device is simple structure, high in sensitivity and low in cost, and rapid and large-scale preparation can be realized.
Owner:SHANGHAI MI FANG ELECTRONICS LTD

Nano-material surface-catalyzed luminescent micro-sensor

The invention discloses a nano-material surface-catalyzed luminescent micro-sensor, which is simple in structure, capable of shortening detection time, good in stability and reproducibility and high in detection efficiency and precision. The micro-sensor has an optical filter or grating (1) and a photoelectric-signal conversion device (2) and is provided with a shell (3), wherein a heating element (4) and a quartz capillary tube (5) are arranged inside the shell (3); the inner wall of the quartz capillary tube (5) is coated with nano-material (6) and is provided with a light transmission surface (7); the light transmission surface (7) is arranged opposite to the optical filter or grating (1); and two ends of the quartz capillary tube (5) are connected with a sample inlet tube (8) and an escape tube (9) respectively.
Owner:刘名扬

Binary rare earth organic framework crystal material, as well as synthesis method and application thereof

The invention provides a binary rare earth organic framework crystal material. The chemical formula of the binary rare earth organic framework crystal material is [Me2NH2][EuxTb1-xL(H2O)4], wherein x is greater than 0 and less than or equal to 5; Me represents methyl; L represents an organic ligand formed by pyridine-2,6 m-phthalic acid; crystals belong to an orthorhombic system, the space group is Pnma, and the cell parameters are as follows: a=8.500 to 8.506 Angstrom, b=17.28 to 17.35 Angstrom, and c=12.05 to 12.15 Angstrom; alpha is equal to 90, beta is equal to 90, gamma is equal to 90, and Z is equal to 4. The binary rare earth organic framework crystal material is extremely high in heat stability and air stability, and can be used for temperature detection within a wide range of 77K to 450K; the temperature range covers a low temperature region, a physiological temperature region and a high temperature region, and is the widest detection temperature range which can be realized at the present.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Method for determining activity of terminal deoxynucleotidyl transferase and application of method

The invention discloses a method for determining activity of terminal deoxynucleotidyl transferase (TdT) and application of the method. The method comprises the steps of: (1) designing a single-stranded DNA as a DNA probe; (2) incubating TdT with different final concentrations with DNA probes, CoCl2, dTTPs and a buffer solution separately to obtain a single-stranded probe DNA solution rich in a poly-T sequence; then adding a mercury salt to incubate to obtain a T-HgII-T structure-mediated double-stranded DNA solution; adding a nucleic acid dye to obtain a mixed solution; and finally detectinga fluorescence intensity signal of the mixed solution, and drawing a detection curve according to the fluorescence intensity signal and the final concentration of TdT; and (5) replacing the TdT with asample to be tested, repeating the above steps, and then comparing the detection result with the detection curve to calculate the content of TdT in the sample to be tested. The method has high sensitivity and good selectivity, and provides a new means for medical detection and biological research.
Owner:JINAN UNIVERSITY

Dispersive spectrum device for SF6 gas detection

The invention provides a dispersive spectrum device for SF6 gas detection. The device comprises a single-wavelength tuning module, a controller, a frequency conversion module, a gas detection module and a radio frequency spectrum analyzer; the single-wavelength tuning module comprises a distributed feedback laser diode, an optical fiber amplifier and a high-speed electro-optical modulator; the controller is used for driving the distributed feedback laser diode; the frequency conversion module comprises an optical fiber coupler and an optical fiber phase matching mechanism; the gas detection module comprises a hollow optical fiber, a hollow optical fiber gas chamber, a gas pump, a vacuum pump, a pressure gauge, a lens and an intermediate infrared detector; the radio frequency spectrum analyzer is used for detecting a phase signal. According to the invention, a chirp dispersion spectrum technology based on a Kramers-Kronig relationship is adopted; the gas concentration is measured by measuring the refractive index fluctuation caused by the gas absorptivity; two sideband signals are generated by a high-speed electro-optic speed regulator for interference; and the gas concentration ismeasured by detecting the reverse phase of an interference signal.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST

Magnetoresistive effect thin-film magnetic head with Anti-ferromagnetic layer for magnetic domain control

A thin-film magnetic head includes a lower electrode layer, an MR multi-layered structure, through which a current passes in a direction perpendicular to a lamination plane, stacked on the lower electrode layer, soft magnetic layers for magnetic domain control formed on both sides in a track width direction of the MR multi-layered structure, an anti-ferromagnetic layer for magnetic domain control continuously stacked on the MR multi-layered structure and the soft magnetic layers for magnetic domain control, the anti-ferromagnetic layer mutually exchanged-coupled to the soft magnetic layers for magnetic domain control, and an upper electrode layer stacked on the anti-ferromagnetic layer for magnetic domain control.
Owner:TDK CORPARATION

Fluorescence chemical method for detecting ALP (Alkaline Phosphatase) and application thereof

The invention discloses a fluorescence chemical method for detecting ALP (Alkaline Phosphatase) and application thereof. The fluorescence chemical method comprises the following steps of: firstly, designing a single-chain DNA (Deoxyribonucleic Acid) of which a 3' terminal is phosphorylated as a DNA probe, dephosphorylating the 3' terminal of the DNA probe and exposing a 3'-OH terminal when the ALPexists; secondly, performing catalytic addition on dTTPs (Deoxythymidine Triphosphates) at a 3'-OH terminal of the DNA probe by TdT (Terminal Deoxynucleotidyl Transferase), thus extending to generatea poly-T tail ssDNA, forming a dual-chain DNA mediated by T-HgII-T structure by the poly-T tail ssDNA and Hg ions, and drawing a detecting curve according to a detected fluorescence intensity signaland the concentration of the ALP after adding nucleic acid dye; finally, replacing the ALP with a to-be-detected sample, repeating the steps, and comparing a detecting result with the detecting curve,thus calculating the content of the ALP in the sample. The fluorescence chemical method disclosed by the invention is simple and convenient, is high in sensitivity and can be used for detecting the ALP or screening ALP inhibitors.
Owner:JINAN UNIVERSITY

Magnetoresistive effect thin-film magnetic head with anti-ferromagnetic layer for magnetic domain control

A thin-film magnetic head includes a lower electrode layer, an MR multi-layered structure, through which a current passes in a direction perpendicular to a lamination plane, stacked on the lower electrode layer, soft magnetic layers for magnetic domain control formed on both sides in a track width direction of the MR multi-layered structure, an anti-ferromagnetic layer for magnetic domain control continuously stacked on the MR multi-layered structure and the soft magnetic layers for magnetic domain control, the anti-ferromagnetic layer mutually exchanged-coupled to the soft magnetic layers for magnetic domain control, and an upper electrode layer stacked on the anti-ferromagnetic layer for magnetic domain control.
Owner:TDK CORPARATION

Linearization technique for current mode filters

A circuit is disclosed that compensates for the non-linearity of a current mode real pole producing circuit used to generate poles and zeros in complex filter circuits. The non-linearity of the prior art is compensated by driving one end of the primary pole producing capacitor with a signal derived from the drain current and fed back so as to counteract the non-linearity factors.
Owner:SEMICON COMPONENTS IND LLC

Soft packaging optical fiber grating sensor with vernier wavelength

This invention relates to an optical fiber and grating sensor with adjustable wavelength and one optical section with light fiber and grating, which are characterized by that the optical fiber goes through the protection cover tube, first clamper middle hole and second clamper middle hole. The said protective cover tube both ends are separately stuck to first and second clampers with soft glue and adhesive agent and stretches the optical section with optical fiber and grating and ensures the optical fiber and grating at the right middle of the protection cover tube. This invention fills the two holes with fix glue stuck to first and second clampers to form one body to make the optical fiber and grating sensor. The said first and second clampers outside screw are located with micro-adjust screw cap. íí
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Method for determining content of propane in insulating oil

InactiveCN107525879AGood linear responseMeet the requirements of fault diagnosis analysisComponent separationGas phasePower equipment
The invention relates to a method for determining the content of propane in insulating oil. The method comprises the following steps: obtaining a to-be-tested insulating oil sample from high-voltage electrical equipment according to a full-seal sampling method; carrying out analysis on standard propane gas by using a gas chromatograph, and producing a standard curve of the content of the propane gas and a gas chromatographic response value; removing the gas dissolved in the insulating oil by using a full vacuum degassing device and then separating out the propane gas in the insulating oil by using a chromatographic column; detecting the gas chromatographic response value of the propane by using the gas chromatograph and contrasting the standard curve to obtain the concentration of the propane gas. The method disclosed by the invention is accurate in test result and can meet the requirements of fault diagnosis analysis of power equipment.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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