42results about How to "Improve the linear relationship" patented technology

The invention discloses a full-spectrum transmission plant biochemical parameter nondestructive detection device and a full-spectrum transmission plant biochemical parameter nondestructive detection method, which are used for solving the technical problems of low model applicability, poor anti-jamming capacity, low detection accuracy, less detected parameters and the like in the conventional spectrum nondestructive detection method. The full-spectrum transmission measurement principle is adopted and a plurality of parameters are simultaneously measured in high accuracy; the time-divided double optical path reference measurement principle is adopted to ensure the accuracy of transmittance spectrum signals; the integrated transmission fixture and program controlled adjustable voltage-stabilizing drive light source circuit makes the measurement principle realized in plant leaf transmittance spectrum measurement so as to form the miniature and portable plant biochemical parameter nondestructive detection device; and in a prediction model of the device, an improved expansion multiple scattering correction method is adopted to correct basic lines of leaves due to scattering and optical path length difference due to different leaf thicknesses, the sensitivity of spectrum data to chemical substance concentration is improved, and the anti-jamming capacity of the model is improved.

The invention discloses a detection device for detecting thickness of a vacuum vapor plating membrane and a vacuum vapor plating device and aims to solve the problem that in the prior art, production cost is excessively high due to frequent change of a quartz vibrator. The detection device comprises a detection structure and a quartz vibrator, and the detection structure is provided with openings corresponding to the quartz vibrator so that vapor plating molecules can be deposited on the quartz vibrator through the openings; the detection device further comprises filtering layers arranged between the openings and the quartz vibrator.

The invention belongs to the chemical field of medicines, and particularly relates to a method for measuring the contents of 5-soquinolinesulfonic acid methyl ester and 5-isoquinolinesulfonic acid ethyl ester in fasudil hydrochloride through an LC-MSMS (Liquid Chromatography-Tandem Mass Spectrum) method. Through HPLC (High Performance Liquid Chromatography), the problems that 5-soquinolinesulfonicacid methyl ester and 5-isoquinolinesulfonic acid ethyl ester can not be simultaneously measured on a single liquid phase condition, in addition, a moving phase greatly damages a chromatographic column and the chromatographic column is non-durable to cause poor method reproducibility can be solved. The LC-MS method is high in detection sensitivity, two ingredients are simultaneously detected, themethod is good in durability and high in accuracy, analysis time is shortened, and detection efficiency is improved.

The invention discloses a thermally induced voltage material and application thereof, belonging to the technical field of transverse thermoelectric materials and devices. A (Ca/Sr) 3Co4O9 or (Ca/Na) xCoO2 (x=0. 52-0.8) thin film is selected as thermally induced voltage material in the present invention. As the thermal field or the thermal fluid induce voltage material of the invention has high signal response rate and does not need to establish heat balance, the response time is fast, and the signal repeatability and the linear relationship are good; the temperature gradient of the thermally induced voltage thin film is converted into a larger thermoelectric voltage signal by directly using heat source or thermal field heating, which has no time term, strong anti-interference ability, no power supply driving, no refrigeration and amplification, and can be used to fabricate some sensitive and fast thermally induced voltage detection devices. The temperature and thermoelectric potentialare perpendicular to each other, and can modulate dimension and direction independently. It is easy to fabricate arrays to detect transient thermal field or heat flux. Compared with the current devices, the material has great breakthrough and advantages, and can be used in the industrial and military fields of pulse or continuous thermal signal detection, transient thermal field and thermal fluiddetection.

The invention relates to the technical field of electronic circuits and discloses a voltage-controlled ring oscillator with high linearity. The voltage-controlled ring oscillator comprises a time delay module, a voltage-to-current conversion circuit and a current mirror, wherein the time delay module is used for generating oscillation signals; the voltage-to-current conversion circuit is used for converting control voltage to driving current; the current mirror is used for mirroring the driving current to the time delay module as the working current of the time delay module; the voltage-to-current conversion circuit is a linear voltage-to-current conversion circuit to enable the frequency of the oscillation signals and the control voltage to present a linear relation; and the time delay unit in the time delay module adopts an output common-mode voltage self-stabilization technology to obtain stable output common-mode level. The voltage-controlled ring oscillator disclosed by the invention has the advantages of high linearity and stable output common-mode voltage.

The invention discloses a moving coil type actuator for the active suspension of an engine. The moving coil type actuator comprises an end cover, two leaf springs, a permanent magnet, a pushing rod, acoil, a coil bracket, an outer keeper, an inner keeper, a fixed-distance tube, and a fastening sleeve, the outer keeper is arranged on the outer side of the inner keeper, the inner keeper and the outer keeper are mounted on the end cover, a groove is formed in the outer side face of the inner keeper, the permanent magnet is fixedly mounted in the groove of the inner keeper, the fixed-distance tube is mounted between the two leaf springs, and the two leaf springs are connected with the top end and the bottom end of the fixed-distance tube; and the coil is arranged between the outer keeper andthe inner keeper, the coil is connected with the coil bracket, and the coil bracket is fixed on the fixed-distance tube through the fastening sleeve. The moving coil type actuator can effectively solve the problem of excessive mass of a rotor, the response speed of the actuator to the control signal in the actuating process and the stiffness linearity within the excitation amplitude range of the engine are improved, the heat emission capacity of a shell of the actuator is improved, and the service life of the shell of the actuator is prolonged.

The invention provides a spectral calibration method for a crop nitrogen sensor. The method is characterized by comprising the following steps: 1) respectively calibrating the irradiance of an up light sensor and the radiance of a down light sensor by using a standard detector, i.e., in virtue of the up light sensor and the standard detector, synchronously measuring the irradiance of the waveband r of sun light and fitting a linear relation between the output DN_Up(r) of the up light sensor and the output EB(r) of the standard detector so as to realize calibration of the optical radiance of the up light sensor as shown in a formula (3) which is described in the specification; etc. The up light sensor is in good linear relation with the irradiance of sun light, the down light sensor is in good linear relation with the radiance, and linear relativity reaches 99%. The calibration method based on radiation can greatly improve measurement precision and stability of the crop nitrogen sensor compared with a calibration method based on a standard gray scale plate.

The invention relates to a single photon detector and a high-voltage quick adjusting circuit thereof. The high-voltage rapid adjustment circuit comprises: a high voltage circuit, a reference voltage circuit, an operational amplifier wherein the output end of the high-voltage circuit is used for outputting a set voltage; the output end of the reference voltage circuit is used for generating a reference voltage; and the in-phase input end of the operational amplifier is connected with the output end of the reference voltage circuit, the output end of the operational amplifier is connected with the control end of a switching tube, the input end of the switching tube is connected with the output end of the high-voltage circuit, the output end of the switching tube is used for being connected with the cathode of the single photon detection diode, and a capacitor is connected between the output end of the operational amplifier and the cathode of the single photon detection diode in parallel.The single photon detector and the high-voltage quick adjusting circuit thereof can prevent the breakdown of the photodiode, avoid the problems of ringing and oscillation and improve the stability ofthe circuit.

The invention provides a microelectrode sensor for detecting staphylococcus aureus as well as a preparation method and an application method of the microelectrode sensor. The microelectrode sensor is a three-electrode system sensor, a counter electrode of the microelectrode sensor is a platinum wire electrode, a reference electrode of the microelectrode sensor is an Ag/AgCl electrode, and a working electrode of the microelectrode sensor is a silver microelectrode modified by chitosan, catechol and a staphylococcus aureus aptamer. The microelectrode sensor disclosed by the invention is constructed on the basis of a microelectrode with a micro-nano structure on the surface, double media (Fc-Ru < 3 + >), chitosan and catechol. The working electrode of the microelectrode sensor can specifically capture staphylococcus aureus. In the CV test process of the microelectrode sensor, CI <-> in bacteria can leak to the surface of the working electrode under the action of local high field intensity, and when CI <-> ions exist, the cathode reduction peak of the working electrode between 0 and-0.1 V can be specifically enhanced, so that a linear relation between bacterial concentration increase and current signal enhancement is established; the purpose of specifically detecting bacteria is achieved.

The invention discloses an FPC module with balanced deflection stress and an electronic device, and relates to the technical field of electronic circuits. The FPC module comprises a first terminal on which a first circuit is distributed, a second terminal on which a second circuit is distributed, and at least three bridging units connected with the first wiring terminal and the second wiring terminal and arranged side by side; a third circuit is distributed on the bridging units, and the first circuit and the second circuit are connected through the third circuit; and the at least three bridging units are used for forming a polygonal three-dimensional supporting structure through reverse bending and staggering. The FPC is designed to be provided with a plurality of bridging units which can form the three-dimensional supporting structure in a staggered mode, the center of the supporting point is located in the center of the three-dimensional supporting structure, balance of deflection stress of the FPC in all directions is facilitated, the stress of the FPC is weakened to a certain degree, the development difficulty of deflection control can be reduced, the linear relation between the deflection degree and the control parameters is improved, and the reliability and stability of FPC deflection control are ensured.

The invention relates to the technical field of pharmaceutical analysis, and particularly discloses a method for detecting genotoxic impurities in safinamide mesylate. The detection method comprises the following steps: a test solution and a reference solution are prepared; and the test solution and the reference solution are detected by adopting a liquid chromatography-mass spectrometry method, and the chromatographic conditions of liquid chromatography are as follows: a C18 chromatographic column is adopted, a formic acid aqueous solution with the volume concentration of 0.1% is taken as a mobile phase A, a methanol solution of formic acid with the volume concentration of 0.1% is taken as a mobile phase B, and gradient elution is performed; and the mass spectrum adopts an ESI ion source and a positive ion detection mode. The detection method provided by the invention has the advantages of being simple, convenient, stable, high in precision, good in reproducibility and the like, can be used for rapidly and accurately detecting the toxic impurities in the safinamide mesylate raw material medicine, and accords with the guiding principle of ICH M7.