59results about How to "Improve stability and precision" patented technology

An electrophysiology catheter for use with a steerable introducer sheath includes a flexible catheter body having a proximal end and a distal end and at least one hollow elongate tip electrode disposed at the distal end of the catheter body. The hollow elongate tip electrode includes a sidewall having at least one elongate gap that provides flexibility allowing the tip electrode to bend relative to a longitudinal axis of the catheter body. The catheter body is an independent, non-steerable structure, and can be moved via movement of the steerable introducer through which it is introduced into a patient.

The invention discloses a particle filtering-based pupil tracking method in a sight tracking system and belongs to the field of human-computer interaction. Aiming at a problem that the pupil tracking efficiency in the conventional infrared image is poor, the method creates a concept of a tri-channel pseudo color image (TCPCM) which fully uses information of each channel, enables the characteristics of a pupil to be obvious, and improves the stability and the accuracy of tracking. Aiming at a problem that a background interferes in a pupil tracking process, the method creates a pupil object model which accords with the morphological characteristics and change rules of the pupil to fully differentiate the front background from the back background so as to decrease the interference of the background to the object model. Aiming at a problem that the prediction effect of the position and the form of the pupil is poor, the method creates a state transition equation embodying the motion rules of the pupil, fully considers various conditions of the state change of the pupil and can effectively predict the position and shape of the pupil. Through high-quality characteristic detection and tracking, the method enables the precision of a developed sight tracking system to reach a level of real-time human-computer interaction.

Timing recovery circuitry for a digital subscriber line (DSL) modem, including a combined frame and timing function for adjusting frame alignment, and for adjusting sample frequency for frequency offset and for phase offset, is disclosed. Frame alignment is adjusted by the frame and timing function by averaging estimates of the phase offset over a plurality of tone pairs within a frame, and then averaging that average estimated phase offset over a plurality of frames to produce a frame offset measurement. Frequency offset is derived by analyzing the extent to which phase error in the received signal varies at a constant rate over time, specifically over a sequence of frames; the sample frequency of the modem is adjusted in response to the detected frequency offset. Phase offset is determined by averaging the phase offset over a plurality of tones within a frame, and integrating differences in this phase offset from frame to frame. The combined frame alignment and sample frequency adjustment may be performed during initialization, or during DSL communications.

The invention relates to a method and a system for automatically extracting the position and profile of a mark point in an image. The method comprises the steps of obtaining an original image; performing median filtering processing on the original image; performing ellipse fitting processing on the mark point subjected to the filtering processing to obtain a preliminary extraction result; converting image point coordinates of points of an ellipse boundary of the preliminary extraction result into polar coordinates; and uniformly selecting the plurality of the points on the ellipse boundary to perform accurate extraction processing, and finally obtaining accurate data of the mark point. According to the method and the system, a mark point area in the image can be extracted automatically and more accurately based on preliminary extraction processing through accurate extraction processing, and a parameter equation of the mark point area is fitted out; and the extracted profile of the mark point can reach the sub-pixel level, so that the accuracy and stability of an existing method are greatly improved.

The invention discloses an automatic focus numerical control laser cutter, which comprises a framework mechanism (1), a focusing mechanism (2), a lens seat mechanism and guide mechanisms (3) consisting of guide slots (3-1), guide keys (3-2) and locking screws (3-3). The framework mechanism comprises a fixed sleeve (1-1), a connecting seat (1-6) and a nozzle (1-7); the focusing mechanism comprises a worm (1-4), a worm gear (1-5), a bearing (1-2), a nut (1-3) and a trapezoidal thread sleeve (2-1); the lens seat mechanism comprises an upper lens seat (2-2) of a blow hole (2-2.1), a focusing lens (2-3) and an aqueous vapor seat (2-4) which consists of an upper part and a lower part and is provided with a blow hole (2-4.1) and an annular cooling water tank (2-4.2), a lower lens seat (2-5) and a ventilation seat (2-6); and the guide mechanisms are arranged in the aqueous vapor seat and bilaterally and symmetrically distributed by taking an axis of the cutter as a center. The cutter with the structure can realize high-precision, high-efficiency and smooth automatic focusing and has large focusing range and good focusing effects so as to expand the thickness range of plates to be cut.

The invention discloses a virtual running parameter detecting method of an air conditioner system. A parameter operational model of an air conditioner is established according to the incidence relation between the temperature of the preset position of the air conditioner and to-be-detected running parameters; when the air conditioner runs, the temperature of the preset position of the air conditioner is collected; and the to-be-detected running parameters are output according to the temperature of the preset position of the air conditioner and the parameter operational model. The invention further discloses a virtual running parameter detecting device of the air conditioner system. The to-be-detected value during running of the air conditioner can be obtained without using multiple metering tools so as to detect the state of the air conditioner, the detecting cost of the air conditioner is reduced, and the detecting stability and precision of the air conditioner are improved.

A microfluidic chip includes a base layer, a fluid layer, and a gas regulating layer. The base layer includes a microarray detecting zone. The microarray detecting zone includes a substrate, a photoresist pattern layer, a blocking layer, a bonding layer, at least one linker molecule, and a probe molecule. The bonding layer is covalently attached to the photoresist pattern layer. The at least one linker molecule is covalently bonded to the binding layer. The probe molecule is covalently bonded to the at least one linker molecule for specifically reacting with an under-test molecule. The fluid layer is disposed over the base layer, and includes plural flow channels for introducing or collecting detecting reagents. The gas regulating layer is disposed over the fluid layer for controlling open/close statuses of the flow channels, thereby controlling a flowing condition of a fluid in the fluid layer.

The invention discloses a sampling device for equal proportions of mixed water samples used in determination of an on-line water quality analyzer. The sampling device includes a first pipe, a second pipe, a quantitative small water pump, a mixing bucket and a sampling line. The second pipe is provided with a first electric ball valve, a Y-shaped filter, a manual sampling port and a tee joint overflow mouth, and the tee joint overflow mouth is communicated with the quantitative small water pump, the quantitative small water pump is connected with a tee joint electric ball valve, the tee joint electric ball valve is connected with the mixing barrel, the mixing barrel and a drainage electric ball valve are communicated through a sample supply pipe, the sampling line is connected with the sample supply pipe, and the sampling line includes a first sampling line and a second sampling line. The sampling device adopts multistage overflow filtering for pretreatment, and quantitatively adopts the brushless microflow quantitative small water pump for sampling, so that the stability and the accuracy of the device are improved, and the sample collection time consumption of the on-line analyzercan be reduced while sampling of the equal proportions of mixed water samples.

The invention relates to a thyristor single-phase voltage adjusting circuit and a control method thereof. The thyristor single-phase voltage adjusting circuit is characterized in that the arrangement of a transformer, a rectifier bridge and the like is omitted, and an alternating current bidirectional zero-crossing signal is directly detected by a photoelectric coupler, so the stability and accuracy of the voltage adjusting circuit are improved; deviation positive and negative signals required by a control algorithm are detected by an effective hardware circuit, and can be sent into a main controller in a digital way, so as to omit the conversion time of an analog to digital converter; the control algorithm adopts the phase-shift triggering, the movement direction of a triggering angle is directly determined according to the deviation positive and negative signals, and the control algorithm belongs to the closed-loop droop control; a thyristor triggering circuit of the voltage adjusting circuit can generate a strong triggering wide pulse signal, so as to guarantee the stable triggering of a thyristor. The voltage adjusting circuit and the control method have the advantages that the cost of hardware is greatly reduced, and the time is saved; the real-time property, accuracy and stability of the control system are improved, and the cost of the whole circuit is reduced.

The invention discloses pollution-free equipment for construction. The pollution-free equipment comprises a substrate and a rotating wheels, wherein the rotating wheels are rotatably arranged at the bottom of the substrate, a containing groove is formed in the bottom surface of the substrate, a longitudinal chute which extends upwards is formed in the inner top wall of the containing groove in a connecting mode, a first transmission cavity which extends from left to right is formed in the substrate above the longitudinal chute, a second transmission cavity is formed in the inner wall of the right side of the longitudinal chute in the connecting mode, a first guide chute is formed in the top of the inner wall of the left side of the longitudinal chute in the connecting mode, the top of thefirst guide chute is opposite to the bottom of the extension tip of the left side of the first transmission cavity, a first screw rod which extends up and down is arranged in the first guide chute, the extension tip of the top of the first screw rod is matched and connected with a first power machine, and the outer surface of the first power machine is arranged in the inner top wall of the first guide chute and is fixedly connected. The pollution-free equipment has the advantages of simple structure and convenience in operation, the hammering accuracy and stability are increased, the labor intensity of workers is reduced, and the transportation cost is reduced.

The invention discloses a pipeline instrument equipment grounding device. In the pipeline station instrument equipment grounding device, a barrier grounding ring (1) is added between an electric interface (13) and an anti-explosion barrier (2) of instrument equipment; the bottom of the barrier grounding ring (1) is connected with a line nose 1 (9) by a bolt 1(7) and a nut (8); the line nose 1(9) is connected with a grounding lead (5); the other end of the grounding lead (5) is connected with a line nose 2(10); the line nose 2(10) is connected to instrument grounding flat steel (11) by a bolt (15) and a nut; the instrument grounding flat steel (11) is connected with electric power grounding net flat steel (12); and the grounding lead (5) is fixed with an instrument protection tube (4) by acable bonding tape 1(6), a cable bonding tape 2(16) and a cable bonding tape 3(17). The pipeline station instrument equipment grounding device is safe, improves the precision and the stability of theinstrument equipment, is convenient to operate and maintain, and reduces equipment investment and construction cost.

The invention discloses a method for determining the activity of bean agglutinin, which mainly comprises the steps that: bean agglutinin solution is prepared, standard erythrocyte solution is prepared, then the bean agglutinin solution is carried out series doubling dilution on the 96-hole elisa plate and the standard erythrocyte solution with the same volume is added to each hole, finally, the light absorption value under 620nm is determined by using an eliasa and the activity of the agglutinin is calculated according to the formula. The invention has accurate determination result, high stability and precision, and strong comparability, establishes a method for preparing standard red blood cells which can be stored and placed for a long time; the tested samples and standard erythrocyte suspension required by the method are few, and a plurality of samples can be determined simultaneously: in addition, the invention has simple operation method, can directly read the data by the eliasa, thus being applicable to determining the activity of the agglutinin of big samples.

The invention discloses ranging equipment based on FMCW radar signal processing and a ranging algorithm thereof. The ranging equipment comprises a radar, a signal processing module and a processor, wherein the signal processing module comprises a filtering and amplifying circuit, a signal stabilization circuit and an output adjusting circuit, an input end of the filtering and amplifying circuit isconnected with a signal output end of the radar, an output end of the filtering and amplifying circuit is connected with an input end of the signal stabilization circuit, an output end of the signalstabilization circuit is connected with an input end of the output adjusting circuit, and an output end of the output adjusting circuit is connected with a signal input end of the processor. The ranging equipment completes distance detection based on FMCW radar signal processing, output signals of the radar are processed by means of the signal processing module, the precision and stability of thesignal are greatly improved, and the processor completes the acquisition of the output signals of the signal processing module and executes the precise and efficient algorithm, so as to calculate a target distance, thus the ranging result has high precision and reliability.

A tool box device for locking and/or unlocking a battery that powers a motor that drives a motor vehicle, including a support housing, a movement transmission system including at least one gear box and at least one transmission shaft, connected to at least one system for engaging a battery locking/unlocking mechanism.

The invention relates to an electro-hydraulic servo valve feedback controller and belongs to the field of automatic control. The electro-hydraulic servo valve feedback controller is characterized by comprising a controller, a pressure sensor, and a peripheral circuit, wherein the peripheral circuit includes an input signal acquiring circuit, a current signal output circuit, and a fault switching circuit which are all connected with the controller; the controller is a single-chip microcomputer based on ATmega16; and the ATmega16 uses advanced RISC structure, has high code execution speed and reliable and stable operation. The electro-hydraulic servo valve feedback controller obviously enhances the stability and the accuracy of an electro-hydraulic servo valve in application, enables the electro-hydraulic servo valve to stably and accurately output pressure, solves problems of unsteady, insufficient or over-high output pressure of the electro-hydraulic servo valve, enables the electro-hydraulic servo valve to operate reliably by means of a fault determining and fault automatic removing function, and increases response speed.

The invention discloses a tip timing measurement device and method based on an optical fiber bundle probe. The tip timing measurement device comprises a blade tip, a light source, the optical fiber bundle probe, a first optical fiber bundle combiner, a second optical fiber bundle combiner, a first optical fiber loss device, a second optical fiber loss device, an optical fiber coupler, a photoelectric detector and a display terminal; light emitted by the light source enters an emitting optical fiber of the optical fiber bundle probe; and when the blade tip sweeps over the optical fiber bundle probe, the light is reflected by the blade tip and then received by a first circle of receiving optical fiber and a second circle of receiving optical fiber, the received light is converged to corresponding optical fibers through the first optical fiber bundle combiner and the second optical fiber bundle combiner, the coupling ratio is adjusted through the first optical fiber loss device and the second optical fiber loss device, optical signals are coupled into the photoelectric detector through the optical fiber coupler, the optical signals are converted into electric signals, and tip timing signals are obtained. Compared with a traditional optical fiber bundle probe, the tip timing precision under the condition of tip gap fluctuation is improved.

The invention relates to a multilayer phase change film based on alternate stacking of germanium antimony telluride and group IV telluride and application of the multilayer phase change film, the multilayer phase change film comprises phase change layers and barrier layers, the phase change layers and the barrier layers are alternately stacked, wherein there are at least two phase change layers, and there is at least one barrier layer; the phase change layers are germanium antimony telluride films, and the barrier layers are group IV telluride films. Germanium-antimony-tellurium materials andIV-group telluride materials in the film are stacked alternately, germanium-antimony-tellurium serves as a phase change layer to achieve storage, the IV-group telluride materials serve as a blocking layer not to participate in phase change, structural relaxation of the phase change layer materials can be inhibited, the element segregation phenomenon of the phase change layer materials can be hindered, and the stability and accuracy of the phase change memory device can be greatly improved; meanwhile, the germanium-antimony-tellurium material has a relatively high crystallization temperature, so stable service in a high-temperature environment can be ensured. The film can be applied to the fields of phase change memories and brain-like computing chips.

The invention discloses a ship tail gas monitoring system based on infrared identification. The ship tail gas monitoring system comprises a thermal infrared imager, a visible light camera, an AIS shipautomatic identification system, a distance measurement terminal and a control system, and is characterized in that the control system is respectively connected with the thermal infrared imager, thevisible light camera, the AIS ship automatic identification system and the distance measurement terminal; the control system collects a characteristic image of a ship tail gas target through the thermal infrared imager; and the AIS ship automatic identification system and the distance measurement terminal are controlled to monitor and track a corresponding ship target, and the control system collects a visual image through the visible light camera and provides a visual effect picture for a user to determine whether identification and tracking are correct or not in combination with the identified ship target. The ship tail gas monitoring system realizes automatic monitoring, tracking, identifying and alarming of the smoke plume exhausted by the ship, can automatically recognize, track and monitor ship atmospheric pollutant emission during berthing and sailing, and can continuously monitor ship tail gas emission, thus improving the monitoring stability and accuracy.

The invention discloses a chopped wave band-gap reference device with a switched-capacitor filter. The chopped wave band-gap reference device with the switched-capacitor filter comprises a chopped wave band-gap reference device body, wherein the output end of the chopped wave band-gap reference device body is connected with the input end of the switched-capacitor filter, the output end of the switched-capacitor filter is connected with the input end of an RC filter, and a reference voltage output port is formed in the output end of the RC filter. An output voltage regulating component formed by connecting at least three resistors in series is arranged in the chopped wave band-gap reference device. The chopped wave band-gap reference device is further provided with a biphase overlapping clock device, wherein the input end of the biphase overlapping clock device is provided with an external clock input port, and the biphase overlapping clock device is provided with at least two clock signal output ends. The voltage regulating component is formed by connecting multiple resistors in series instead of one resistor, and thus final output voltage which is originally fixed is made adjustable; the influence of offset voltage on reference voltage is eliminated through filtering, noise at the low frequency 1/f of a chopped wave operational amplifier is converted to noise at the clock frequency, the influence of the noise at the low frequency 1/f is greatly reduced after filtering, and both the stability and the accuracy of the reference voltage are improved.

In a measuring device 50, a microwave receiving unit 52 is disposed behind a microwave transmitting unit 51 with respect to a powder object 2, and the microwave transmitting unit 51 and the microwave receiving unit 52 are each enclosed by a waveguide box. A waveguide box 6 for the transmitting unit is smaller than a waveguide box 8 for the receiving unit, and is enclosed by the waveguide box 8 for the receiving unit. An opening portion 7 of the waveguide box 6 and an opening portion 9 of the waveguide box 8 are mounted on a flat window material 5, and are aligned. The window material 5 is in contact with the powder object 2. Microwaves 3 transmitted from the microwave transmitting unit 51 are reflected by the powder object 2, are received, as scattered microwaves 4, by the microwave receiving unit 52, and are measured.

The invention discloses a diaphragm support structure of an expansion valve, which comprises a support body and a flexible support plate, wherein the flexible support plate is mounted on the upper end surface of the support body, and the peripheral edge of the flexible support plate extends out of the upper end surface of the support body along the radial direction for facilitating the flexible deformation of the flexible support plate. The diaphragm support structure can simultaneously ensure the long service life of a diaphragm and high stability and high precision of the expansion valve. The invention further discloses the expansion valve with the diaphragm support structure.

The invention relates to the technical field of medical apparatus and instruments, in particular to a thoracocentesis positioning device for the respiratory internal medicine department. The device comprises a bed body, wherein the left side surface of the bed body is rotatably connected with a sliding rod through one pair of supporting seats which are in front and back symmetric arrangement; theright side surface of the bed body is rotatably connected with a threaded rod through one pair of supporting seats which are in front and back symmetric arrangement; a U-shaped rod is erected just above the bed body; the left end of the U-shaped rod is in sliding sheathing to the sliding rod, and the right end of the U-shaped rod is spirally connected with the threaded rod; a positioning mechanismis in sliding sheathing to the U-shaped rod; and the bottom of the bed body is provided with a storage mechanism. By use of the thoracocentesis positioning device, a needle guidance ring is accurately near a point to be punctured so as to be convenient for medical care personnel in carrying out puncture treatment, and accuracy and stability during puncturing are improved so as to improve a treatment effect.

The invention discloses a high-stability video triggering method and a digital oscilloscope, and the method comprises the steps: obtaining a video signal, carrying out the low-pass filtering of the video signal, so as to filter a high-frequency component in the video signal, and obtaining a filtering signal; detecting the minimum valley value of each negative pulse in the filtering signal, and calculating and obtaining a comparison level in combination with a preset hysteresis window size; performing digital comparison on the filtering signal according to the comparison level to generate a synchronizing signal; performing video triggering processing according to the synchronization signal to obtain a triggering signal; and controlling to store and display a signal waveform near the triggering position on the video signal according to the triggering signal. The comparison level is calculated by combining the minimum valley value of the negative pulse and the size of the hysteresis window, therefore, digital comparison can be carried out on the filtering signals in each updating period, the application effect of comparison level self-adaptive following is achieved, the application limitation that the comparison level is fixed in the past is effectively avoided, and meanwhile the interference effect of superimposed noise on the filtering signals can be reduced to the maximum extent.

A method for determining picric acid in doctor solution includes removing off large amount of basic salt matter in solution then applying external standard means of liquid phase chromatography to analyze content of picric acid in test sample of doctor solution.

The invention provides a virtual temperature sampling control device and method for induction heating. The system includes an induction heating inverter, a data acquisition part and a data processing control part; the induction heating inverter is provided with a power switching tube use for generating square wave signals; and the data acquisition part acquires the square wave signals, analyzes the duty ratio of the square wave signals, converts analysis results into analog signals, compares the analog signals with a temperature threshold value, determines a difference value, performs amplification and PID setting on the difference value, and transmits PID setting results to the induction heating inverter. With the virtual temperature sampling control device and method for induction heating of the invention adopted, improvement on the accuracy and stability of temperature data sampling can be better benefitted. The virtual temperature sampling control device and method for induction heating have strong anti-interference ability. An acquisition device can be flexibly configured according to actual situations. The virtual temperature sampling control device and method have stably high precision and can be conveniently configured in induction heating devices of different types and specifications.